WO2021215492A1 - Non-woven fabric for hygiene, hygienic product and absorbent article provided with same, and method for manufacturing non-woven fabric for hygiene - Google Patents

Non-woven fabric for hygiene, hygienic product and absorbent article provided with same, and method for manufacturing non-woven fabric for hygiene Download PDF

Info

Publication number
WO2021215492A1
WO2021215492A1 PCT/JP2021/016278 JP2021016278W WO2021215492A1 WO 2021215492 A1 WO2021215492 A1 WO 2021215492A1 JP 2021016278 W JP2021016278 W JP 2021016278W WO 2021215492 A1 WO2021215492 A1 WO 2021215492A1
Authority
WO
WIPO (PCT)
Prior art keywords
sanitary
fiber
woven fabric
fibers
polyethylene resin
Prior art date
Application number
PCT/JP2021/016278
Other languages
French (fr)
Japanese (ja)
Inventor
奈都美 小林
裕太 寒川
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN202180029359.XA priority Critical patent/CN115427621A/en
Publication of WO2021215492A1 publication Critical patent/WO2021215492A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series

Definitions

  • the present invention relates to a non-woven fabric for hygiene, a sanitary product and an absorbent article provided with the non-woven fabric for hygiene, and a method for producing the non-woven fabric for hygiene.
  • Patent Document 1 discloses a comfort fabric intended to be used for clothing for eliminating the feeling of heat in summer.
  • This cloth contains at least one kind of organic polymer fiber having a thermal conductivity of 5 W / mK or more in the fiber axis direction from 20 ° C. to 30 ° C., and has a thermal conductivity in the thickness direction of the cloth from 20 ° C. to 30 ° C.
  • the contact cold temperature feeling is 0.13 W / cm 2 or more at 08 W / mK or more.
  • Patent Document 2 discloses a sheet-like fiber bundle aggregate which is excellent in cool contact characteristics and is used for bedding and rugs. This aggregate is formed by laminating a plurality of sheet-like materials containing high molecular weight polyethylene fibers having an average fiber length of 10 to 200 mm.
  • This sheet contains hydrophobic fibers and cellulosic fibers, and has a cool contact feeling q max of 2.5 kW / m 2 or less on both sides of the sheet when the water content is 50% by mass.
  • Japanese Unexamined Patent Publication No. 2010-236130 Japanese Unexamined Patent Publication No. 2018-1455777 Japanese Unexamined Patent Publication No. 2019-42403
  • the present invention relates to a sanitary nonwoven fabric.
  • the sanitary nonwoven fabric contains fibers whose surface is at least partly made of polyethylene resin.
  • the volume filling rate of the sanitary nonwoven fabric is preferably 3.5% or more.
  • the present invention also relates to an absorbent article comprising the sanitary nonwoven fabric.
  • the present invention also relates to a hygienic product comprising the non-woven fabric for hygiene.
  • the sanitary product comprises a second member arranged adjacent to the sanitary nonwoven fabric.
  • the second member has a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
  • the present invention relates to a method for producing a sanitary non-woven fabric, which obtains a fiber aggregate by performing an air-through treatment on a web of fibers having at least a part of the surface made of polyethylene resin.
  • the fiber aggregates are preferably consolidated.
  • Hygiene products such as absorbent articles used to absorb liquid discharged from the body such as sanitary napkins and panty liners are composed by combining a plurality of constituent members including non-woven fabric.
  • the wearer may perceive a feeling of warmth and may be reminded of discomfort such as stuffiness during use. This can be especially noticeable in hot environments. Therefore, it is desirable that the part of the hygienic product such as an absorbent article that comes into contact with the skin is configured to perceive a feeling of coldness.
  • Patent Documents 1 and 2 are applied to articles other than hygienic products such as clothing and bedding, and their application to hygienic products has not been studied at all.
  • Patent Document 3 The technique described in Patent Document 3 is less likely to cause discomfort even when it comes into contact with the skin in a wet state, but it improves the reduction of discomfort before using an absorbent article, when wearing it, and before absorbing liquid. There was room.
  • the present invention relates to a sanitary non-woven fabric that gives a comfortable feeling of use by perceiving a feeling of coldness when touching the skin, and a sanitary product and an absorbent article provided with the non-woven fabric for hygiene.
  • the non-woven fabric for hygiene of the present invention is suitably used as a constituent member of a sanitary product.
  • Typical examples of hygienic products are hygienic products such as face masks and eye masks, and absorbent products that absorb body fluids such as urine and menstrual blood, and are preferably absorbent products.
  • the hygienic non-woven fabric is placed on the skin contact surface side, which is the surface that comes into contact with the wearer's skin when wearing the hygiene product, or is placed on the part that comes into contact with the user's hand when handling the hygiene product. Or something.
  • the sanitary nonwoven fabric is not particularly limited to the uses described herein and is applicable.
  • the sanitary nonwoven fabric of the present invention is a fiber sheet containing fibers whose surface is at least partly made of polyethylene resin, and is preferably composed of only the fibers.
  • the constituent fibers of the sanitary nonwoven fabric maintain the morphology of the fiber sheet by at least one of entanglement, fusion and pressure bonding. Therefore, the sanitary nonwoven fabric of the present invention is mainly composed of a form in which the boundaries between the constituent fibers that come into contact with each other are clear.
  • the fibers contained in the sanitary non-woven fabric have polyethylene resin on at least a part of the fiber surface.
  • Examples of the existence mode of the polyethylene resin of the fiber contained in the non-woven fabric for sanitary use of the present invention include (i) a mode in which both the outer surface and the inside of the fiber are made of polyethylene resin, that is, a mode in which the constituent resin of the fiber is only polyethylene resin.
  • a low melting point component made of polyethylene resin and a high melting point component having a higher melting point than the low melting point component are contained, and at least a part of the fiber surface is continuously present in the length direction. Examples thereof include the mode of the component-based composite fiber.
  • polyethylene resin is known to have high thermal conductivity among organic polymer materials.
  • Specific examples of the above (i) include fibers made of a single type of polyethylene resin as the constituent resin and fibers made of only a plurality of types of polyethylene resins as the constituent resin.
  • Specific examples of the above (ii) include (a) a core sheath fiber in which a resin other than polyethylene resin is used as the core as the high melting point component and a polyethylene resin sheath is formed as the low melting point component so as to cover the surface of the core.
  • the fibers used in the present invention may be solid or hollow. It is preferably a solid fiber from the viewpoint of increasing thermal conductivity and making it easier for the user to perceive a feeling of coldness.
  • the polyethylene resin in the fiber it is preferable to have the polyethylene resin in at least the entire outer surface of the fiber, and it is preferable that the entire fiber is made of the polyethylene resin. That is, it is preferable that the fiber has a core-sheath structure with a polyethylene resin as a sheath, or is a solid fiber made of only polyethylene resin. With such a configuration, the polyethylene resin having high thermal conductivity comes into direct contact with the skin of the user, so that the user can strongly perceive a feeling of coldness.
  • the fibers present in the sanitary non-woven fabric are more preferably fibers made of only polyethylene resin as the constituent resin thereof.
  • the fibers can be easily configured so as to have high thermal conductivity, so that the user can perceive a feeling of coldness more strongly.
  • Examples of the polyethylene resin used in the present invention include low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (LLDPE), and ethylene.
  • LDPE low density polyethylene resin
  • MDPE medium density polyethylene resin
  • HDPE high density polyethylene resin
  • LLDPE linear low density polyethylene resin
  • ethylene -Examples include propylene copolymer and the like. These can be used alone or in admixture or in combination.
  • the proportion of ethylene units in the copolymer is preferably 95% by mass or more, more preferably 98% by mass or more, from the viewpoint of enhancing thermal conductivity.
  • the proportion of the propylene unit in the copolymer is preferably 5% by mass or less, more preferably 2% by mass or less.
  • Examples of the fiber made only of polyethylene resin include fibers made only of HDPE (that is, fibers having 100% by mass of HDPE), core-sheath fibers using a plurality of various polyethylenes described above, and side-by-side fibers.
  • the core-sheath fiber or side-by-side fiber using only polyethylene resin for example, a fiber using HDPE having a different melting point for the core and the sheath, or one or more of LDPE and LLDPE for the core and HDPE for the sheath was used.
  • Examples include core-sheath fibers, core-sheath fibers using HDPE for the core and LLDPE for the sheath, and side-by-side fibers in which HDPE is continuously present along the length direction on at least a part of the surface of the fibers using LLDPE. Be done.
  • the type or combination of polyethylene resin is not limited to the above-mentioned contents and can be applied.
  • HDPE is preferably contained as the polyethylene resin, and may consist only of HDPE, from the viewpoint of having high thermal conductivity and enabling the user to perceive a feeling of coldness more strongly. More preferred. That is, it is more preferable to use HDPE alone.
  • the resin other than the polyethylene resin used in the present invention examples include polyolefin resins other than polyethylene resins such as polypropylene (PP) and polybutene, polyester resins such as polyethylene terephthalate (PET), polyamide resins, polyvinyl chloride and polystyrene.
  • polyolefin resins other than polyethylene resins such as polypropylene (PP) and polybutene
  • PET resins such as polyethylene terephthalate (PET)
  • PET polyamide resins
  • polyvinyl chloride polystyrene
  • vinyl resins acrylic resins such as polyacrylic acid and polymethyl methacrylate
  • fluororesins such as polyperfluoroethylene
  • nylon such as polyperfluoroethylene
  • the content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass or less. , Even more preferably 100% by mass.
  • the sanitary nonwoven fabric of the present invention contains fibers having a thermal conductivity of a predetermined value or more in at least a part of the surface.
  • the sanitary non-woven fabric has fibers having a thermal conductivity of preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more as a part of the surface. It is preferable to contain it. Further, it is realistic that the non-woven fabric for hygiene contains fibers having a thermal conductivity of 0.4 W / mK or less in a part of the surface.
  • the above-mentioned thermal conductivity can be measured, for example, by melting a sanitary non-woven fabric and forming it into a film-like sample having a thickness of about 1 mm. The detailed measurement method will be described later.
  • the configuration relating to thermal conductivity in this embodiment can be adopted in place of or in conjunction with the above-described embodiment. Further, with respect to the points not described in the present embodiment, the above-described description of the embodiment and each configuration can be appropriately applied.
  • the above-mentioned sanitary nonwoven fabric having thermal conductivity can be obtained, for example, by including as a constituent fiber a fiber containing one or more of the polyethylene resins used in the above-described embodiment.
  • the thermal conductivity of at least a part of the surface of the constituent fibers is preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more. It is preferable to use a fiber having such a thermal conductivity from the viewpoint that the range of the thermal conductivity in the sanitary nonwoven fabric can be easily achieved. Further, the above-mentioned thermal conductivity of the constituent fibers can be easily achieved by using, for example, a fiber made of only polyethylene resin.
  • the thermal conductivity can be measured by, for example, the following method.
  • the non-woven fabric or fiber to be measured is separated from the product by peeling it from the product using a cold spray or the like, or by collecting the fiber.
  • the separated non-woven fabric or fiber is introduced into a heating and pressurizing facility such as a press machine and pressed while heating at a temperature equal to or higher than the melting point of the non-woven fabric or fiber raw material to obtain a film-like sample having a thickness of about 1 mm.
  • the pressurizing conditions are appropriately adjusted so that air does not remain in the sample.
  • heat conduction is based on the amount of heat transferred from the hot plate at 30 ° C to the hot plate at 20 ° C via the sample. Measure the rate. This measurement is performed at 10 points per film-like sample, and the value of the highest thermal conductivity among these is defined as the thermal conductivity (W / mK) in the present invention.
  • the sanitary woven fabric of the present invention has a volume filling rate of preferably 3.5% or more, more preferably 3.5% or more, from the viewpoint of reducing the content of air having a low thermal conductivity and improving the thermal conductivity of the woven fabric. It is 7.0% or more, more preferably 10.0% or more, even more preferably 14.0% or more, still more preferably 20.0% or more. Further, when used as a disposable hygiene material that comes into contact with the user's skin, the above-mentioned volume filling rate is preferably 60.0% or less, more preferably 50.0% or less, from the viewpoint of improving the texture. More preferably, it is 30.0% or less.
  • the content of air having low thermal conductivity is reduced in the sanitary non-woven fabric, so that the heat transfer can be improved, and due to this, the user. Can make you feel colder.
  • the texture of the fiber sheet and the hygienic product incorporating the sheet can be sufficiently expressed.
  • the above-described configuration can be obtained by compressing the fiber sheet or the like, for example, as in the manufacturing method described later.
  • the volume filling rate of the outermost layer in contact with the user's skin may be within the above range.
  • the above-mentioned configuration regarding the volume filling rate includes a sanitary non-woven fabric containing fibers whose surface is at least partly made of polyethylene resin, a sanitary non-woven fabric having a heat conductivity on the surface of the constituent fibers of a predetermined value or more, and heat as the non-woven fabric. It can be applied to each embodiment of the sanitary nonwoven fabric having a conductivity of a predetermined value or more.
  • the volume filling factor in the present invention can be expressed as a percentage of the apparent volume with respect to the actual volume.
  • a predetermined area of the sanitary non-woven fabric to be measured is cut out to obtain a measurement sample, and the mass (g) thereof is measured.
  • the predetermined area for cutting the measurement sample is preferably 10 cm square, but if the measurement sample cannot be cut out with that size, it can be done in a region where the basis weight of the sanitary non-woven fabric to be measured is visually uniform. Cut out with a width and length that will be the largest area. Then, the basis weight A (g / cm 2 ) of the measurement sample is calculated.
  • the method for measuring the thickness B (cm) of the measurement sample is as follows.
  • a plate of 12.59 g (diameter 55 mm) was placed on a laser displacement meter (LK-080 manufactured by KEYENCE CORPORATION. All laser displacement meters in the present specification are this), and the measured thickness was measured. Is set to zero and the zero point is adjusted. Then, the plate is placed on the measurement sample, and the thickness in that state is measured using a laser displacement meter, and this is defined as the thickness B (cm) of the measurement sample. In the measurement of the thickness B, a load of 4.9 mN / cm 2 is applied to the measurement sample by placing the plate. Further, the volume filling rate (%) is calculated from the following formula using the density C (g / cm 3) of the constituent components of the fiber.
  • volume filling rate (%) 100 ⁇ (A) / (B ⁇ C) If the hygiene non-woven fabric to be measured is incorporated into a hygienic product such as an absorbent article, spray a cold spray on the hygiene product to solidify the hot melt adhesive, and then carefully apply the hygiene non-woven fabric to be measured. Peel off. This means is common to other measurements herein.
  • the sanitary non-woven fabric having the above structure uses fibers having polyethylene resin having high thermal conductivity as at least a part of the surface among synthetic resins, when the fibers come into contact with the user's skin, the user The heat caused by the body temperature can be quickly transferred from the user to the sanitary non-woven fabric or to other fibers that are not in contact with the user.
  • the volume filling rate of the sanitary non-woven fabric is within a predetermined value range, so that the hygienic non-woven fabric contains air having low thermal conductivity while exhibiting a good texture as a fiber sheet. Since the amount can be reduced, the heat generated by the user can be quickly transferred to the sanitary non-woven fabric side.
  • the user when the user's skin comes into contact with the sanitary non-woven fabric, the user can perceive a feeling of coldness and can give a comfortable feeling of use due to the feeling of coldness.
  • the user can be made to perceive a feeling of coldness more strongly, which contributes to further improvement of the feeling of use.
  • the sanitary non-woven fabric is configured to include the form of fibers, the contact area when the user's skin and the sanitary non-woven fabric come into contact with each other can be increased, and the user can perceive a feeling of coldness. At the same time, the flexibility due to the composition of the non-woven fabric can be exhibited.
  • the fibers constituting the sanitary non-woven fabric are preferably in contact with each other, and more preferably the fibers are in contact with each other at a plurality of points.
  • the heat generated by the contact with the user's skin can be transferred in multiple directions, so that the heat caused by the user's body temperature can be transferred with high efficiency, and as a result, to the user. It is possible to perceive a feeling of coldness more efficiently.
  • the term "contacting" in the present invention means that the fibers are in contact with each other with a clear boundary between the fibers, and that the fibers are fused to each other, and the boundary between the fibers is not present. Includes both aspects that are clear.
  • contacting at a plurality of points means that when a non-woven fabric is cut in a direction orthogonal to the extending direction of its constituent fibers and an arbitrary fiber F on the cut surface is observed, the non-woven fabric is in the thickness direction of the non-woven fabric. It means that the upper and lower fibers located and in contact with the fiber F are in contact with the fiber F at two or more points.
  • a fiber having a non-circular cross-sectional shape such as an elliptical shape or a multi-leaf shape, which will be described later, is used, and the non-woven fabric as a raw material is used in the manufacturing process described later. It can be obtained by performing a consolidation process such as compression.
  • the contact mode is preferably configured by fusion or pressure bonding.
  • Fusing is a mode in which the boundary between fibers becomes unclear because the fibers are melted by applying only heat or heat and pressure to a plurality of fibers.
  • Crimping is a mode in which only pressure is applied to a plurality of fibers so that the fibers are in contact with each other with a clear boundary between the fibers, and it is permissible that a gap formed between the fibers exists. .. In the crimping, it is also preferable that the above-mentioned "contact at a plurality of points" mode is adopted.
  • cross-sectional shape of the fibers constituting the sanitary non-woven fabric examples include circular shapes such as perfect circles and ellipses, and geometric shapes such as convex polygons such as triangles, quadrangles, pentagons and hexagons, and regular polygons. .. Further, in addition to these geometric shapes, a multi-leaf shape may be formed in which a structure having a plurality of concave portions and convex portions is formed along the outer periphery of the cross section.
  • the "cross-sectional shape" in the present invention refers to a shape when the fibers constituting the sanitary non-woven fabric are observed in a cross section orthogonal to the extending direction thereof.
  • the cross-sectional shape of the fiber is preferably a non-perfect circular shape, and is a shape having a major axis and a minor axis, such as an elliptical shape or a combination of an elliptical shape and a multi-leaf shape. Is more preferable. With such a shape, it is possible to easily increase the volume filling rate of the sanitary non-woven fabric, and increase the number of contact points and contact areas between fibers to further improve the heat transfer efficiency. Therefore, the feeling of coldness can be perceived more effectively by the user.
  • the ratio of the length of the major axis to the length of the minor axis is preferably It is 1.5 or more, more preferably 2 or more, and even more preferably 3 or more. Further, the above-mentioned ratio is preferably 10 or less, more preferably 8 or less, still more preferably 5 or less, from the viewpoint of improving the spinnability at the time of producing the fiber and increasing the production efficiency. Moreover, it is preferable that the above-mentioned ratio is satisfied in the total length of the fiber.
  • the length of each of the major axis and the minor axis in the cross-sectional shape of the fiber can be measured by, for example, the following method.
  • First, the non-woven fabric to be measured is cooled with liquid nitrogen and then cut with a cutter in the direction orthogonal to the fiber length direction to prepare a measurement sample.
  • the cross section of the measurement sample is observed using a scanning electron microscope (SEM) at an arbitrary magnification such that the fiber cross section can be recognized and the size of the fiber cross section can be measured.
  • SEM scanning electron microscope
  • the thickness of the non-woven fabric for hygiene is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more. Further, from the viewpoint of reducing the air content in the non-woven fabric and increasing the thermal conductivity, it is preferably 3 mm or less, more preferably 1.5 mm or less, still more preferably 0.5 mm or less.
  • the thickness of the above-mentioned sanitary nonwoven fabric shall be measured using a laser displacement meter or the like under a load of 4.9 mN / cm 2 (0.5 gf / cm 2). Since the thickness of the sanitary nonwoven fabric is configured as described above, it is possible to efficiently manufacture the sanitary nonwoven fabric that can increase the heat capacity of the sanitary nonwoven fabric and allow the user to efficiently perceive a feeling of coldness.
  • the sanitary nonwoven fabric of the present invention has a basis weight of preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, and further preferably 25 g / m 2 or more.
  • the non-woven fabric for hygiene of the present invention has a basis weight of preferably 140 g / m 2 or less, more preferably 90 g / m 2 or less, and further preferably 50 g / m 2 or less.
  • the contact sensation q max is preferably 0.06 W / m 2 or more, more preferably 0.08 W / m 2 or more, further preferably 0.10 W / m 2 or more, preferably 0.80 W / m 2 or less, more preferably 0.60 W / m 2, more preferably not more than 0.50 W / m 2.
  • contact sensation q max of hygiene nonwovens preferably 0.06 W / m 2 or more 0.80 W / m 2 or less, more preferably 0.08 W / m 2 or more 0.60 W / m 2 or less , further preferably 0.10 W / m 2 or more 0.50 W / m 2 or less.
  • the cool contact feeling q max can be measured by, for example, the following method. First, a test piece is cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece is left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Next, in this environment, the test piece is placed on the measuring table, and the test piece is fixed to the measuring table using double-sided tape. As the measuring table, a constant temperature device using a gas or liquid as a heat medium is used.
  • the cool contact feeling q max of the measurement target is measured according to the measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.) and the measurement manual of the device.
  • a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target).
  • the contact pressure of the copper plate to the measurement target is set to 1 kPa, the copper plate is brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact is set to zero, and the maximum value of the heat flow rate is measured.
  • This measurement is performed 5 times for the surface to be measured, and the arithmetic mean value of the plurality of measured values is defined as the cool contact feeling q max (W / m 2 ) of the measurement target.
  • the cool contact sensation is a numerical value of the sensation of the skin that feels cold when the skin touches an object. This cool contact feeling depends on the amount of heat transferred from the skin to the object when the skin touches the object, and the larger the amount of heat transferred, the colder the feeling when touched.
  • the cool contact feeling q max corresponds to the maximum value of the amount of heat transferred from the skin to the object, and the value of the cool contact feeling q max is larger and feels warmer when the object is touched. The smaller the case. Therefore, when the value of the contact cooling sensation q max is in the above range, the cooling sensation can be perceived more effectively.
  • the sanitary nonwoven fabric of the present invention is a sheet-like material having two surfaces, and the abundance ratio of constituent fibers on the surface of the sanitary nonwoven fabric (hereinafter, this is also referred to as "fiber surface abundance ratio”) is equal to or higher than a predetermined value. Is preferable.
  • the surface of the sanitary non-woven fabric is a region from the outermost surface of the sanitary non-woven fabric to 20 ⁇ m in the thickness direction.
  • the outermost surface of the sanitary non-woven fabric is the thickness direction in the image when the sanitary non-woven fabric is cut along the thickness direction and the cross section along the thickness direction is observed using a scanning electron microscope (SEM).
  • the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more, more preferably 45% or more, still more preferably 50% or more, preferably 90% or less, more preferably 85% or less, and further. It is preferably 80% or less. More specifically, the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more and 90% or less, more preferably 45% or more and 85% or less, and further preferably 50% or more and 80% or less.
  • the fiber surface abundance ratio is a representation of the relationship between the constituent fibers and the voids between the fibers on the surface of the non-woven fabric, focusing on the abundance ratio of the fibers. Therefore, when the fiber surface abundance rate is in the above range, the air content in the fiber can be reduced, and a higher cooling sensation can be obtained.
  • the fiber surface abundance can be measured as an area-based ratio, for example, based on the following method. Specifically, two sections having a size of 4 cm ⁇ 4 cm are randomly cut from the sanitary non-woven fabric to be measured. One surface of the obtained sample is measured using a scanning electron microscope (SEM) at a voltage of 15 kV and a magnification of 50 times to obtain an SEM image. Next, using the image processing software WinROOF2018 (manufactured by Mitani Shoji Co., Ltd.), the SEM image was binarized at a threshold value of 121 to 255, and the light color (white) of the binarized area with respect to the entire area of the image.
  • SEM scanning electron microscope
  • WinROOF2018 manufactured by Mitani Shoji Co., Ltd.
  • the area ratio at the site is measured and calculated using the area calculation function built into the software, and this area ratio is used as the fiber surface abundance rate of the present invention.
  • the threshold value is binarized to a value of 70 to 255, and the area ratio of the light-colored portion is measured.
  • the fibers constituting the nonwoven fabric are arranged with a certain orientation. With such a configuration, heat transfer is likely to occur along the fiber length direction, and it is possible to make the user perceive a feeling of coldness.
  • the fiber length direction of the fibers of the non-woven fabric is substantially parallel to the horizontal plane when the non-woven fabric is allowed to stand on the horizontal plane.
  • the extending direction of the fibers is one direction.
  • the extending direction of the fibers is the first direction or the second direction of the non-woven fabric. It is more preferable that it matches with.
  • the fibers have intersections, it is desirable that 50% or more of the fibers having the intersections have an obtuse angle in the plan view of the sanitary non-woven fabric.
  • An obtuse angle refers to an angle larger than 90 °.
  • a long sheet is manufactured using HDPE short fibers as a material, the long sheet is conveyed while applying tension in the conveying direction, and the fibers are fused by an air-through method.
  • it can be obtained by manufacturing by a method of transporting the HDPE fiber in one direction while spinning the HDPE fiber to a transport facility such as a belt conveyor.
  • the sanitary nonwoven fabric has an embodiment in which it has a single fiber layer containing fibers in which at least a part of the surface is made of polyethylene resin (consisting of only a single fiber or with other fibers). (It does not matter whether it is a mixed cotton or not) has been explained as an example, but the present invention is not limited to this form.
  • the sanitary nonwoven fabric may have a plurality of fiber layers of two or more layers.
  • a fiber layer containing a first fiber whose surface is at least partially made of polyethylene resin hereinafter, also referred to as a first fiber layer
  • a second fiber containing fibers other than the first fiber hereinafter, this is also referred to as a second fiber layer.
  • adjacent means that the fiber layers are adjacent to each other without interposing other fiber layers, and it is permissible that an adhesive is interposed between the fiber layers.
  • the first fiber layer constitutes the outer surface of the sanitary non-woven fabric.
  • At least the first fiber layer satisfies various preferable forms of the above-mentioned sanitary nonwoven fabric, and it is more preferable that the entire sanitary nonwoven fabric satisfies the above-mentioned preferable forms.
  • the multi-layered sanitary nonwoven fabric is obtained by laminating, for example, a fiber web containing a first fiber whose surface is at least partially made of polyethylene resin and a second fiber web containing fibers other than the first fiber. It can be obtained by performing air-through processing or spunbond processing in the state.
  • the boundary of each fiber layer is generally unclear, but it may include a portion where the boundary is clear.
  • each fiber layer maintains the shape of the fiber sheet by, for example, at least one of entanglement, fusion and pressure bonding.
  • Another embodiment of the multi-layered sanitary non-woven fabric is a fiber web or fiber sheet containing first fibers in which at least a part of the surface is made of polyethylene resin, and a fiber web or fiber sheet containing fibers other than the first fibers.
  • An embodiment in which the form of the fiber sheet is maintained by adhering and joining with an adhesive can be mentioned. In this case, the boundaries of each fiber layer are generally clear.
  • the fibers other than the first fiber include fibers containing the above-mentioned constituent resins such as PET resin and PP resin, pulp fibers, rayon fibers, and other hydrophilized fibers.
  • the basis weight of the second fiber layer is preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, further preferably 25 g / m 2 or more, and preferably 140 g / m 2 or less, more preferably 90 g / m. It is 2 or less, more preferably 70 g / m 2 or less.
  • the above-mentioned sanitary non-woven fabric may be used as it is, or the sanitary non-woven fabric may be used as a constituent member of the sanitary product and may be a sanitary product provided with the sanitary non-woven fabric. Further, when the sanitary nonwoven fabric of the present invention is incorporated into a sanitary product, it is preferable that the nonwoven fabric constitutes a surface facing the skin of the user. In either case, they are typically disposable.
  • the hygienic product provided with the non-woven fabric for hygiene of the present invention is, for example, an absorbent article. That is, the sanitary non-woven fabric can be used as a constituent member of an absorbent article or the like.
  • the absorbent article comprises a front surface sheet, a back surface sheet, and an absorber disposed between the front surface sheet and the back surface sheet, and in addition to this, or a front surface sheet or a back surface sheet. Instead of, it can be used in a state where a sanitary non-woven fabric is arranged.
  • Absorbent articles include, for example, disposable diapers, incontinence pads, sanitary napkins, panty liners, etc., but are not limited thereto, and articles used for absorbing liquid discharged from the human body are widely used. Include.
  • the sanitary non-woven fabric is used when using a sanitary product such as an absorbent article, or when handling a sanitary product such as an absorbent article from the packaging. It can be placed on the part that comes into direct contact with the person's skin. That is, the sanitary non-woven fabric is preferably arranged on the outer surface of a sanitary product such as an absorbent article.
  • the outer surface of hygiene products such as absorbent articles is the surface of hygienic products such as absorbent articles that the user can touch after opening the package and taking out the hygienic products such as absorbent articles. It is contained, but it means the surface side, not the inner surface, which is advanced in the thickness direction.
  • the hygienic non-woven fabric constituting the hygiene product may be arranged on the surface facing the skin of the wearer wearing the hygiene product, or may be arranged on the surface not facing the skin of the wearer wearing the hygiene product.
  • a sanitary product package may be constructed.
  • an absorbent article which is an embodiment of a sanitary product for example, when a sanitary non-woven fabric is used for a disposable diaper, for example, a surface sheet, a side non-woven fabric, gathers around the waist and gathers arranged in the vicinity of the inguinal region, and an exterior. It can be used as a constituent member of a body or the like.
  • a sanitary non-woven fabric is used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a hygienic product, for example, a surface sheet, a side non-woven fabric, a hip guard, a bag for individual wrapping, or the like is configured. It can be used as a member.
  • a sanitary non-woven fabric when used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a sanitary product, it may be used as a constituent member such as a surface sheet or gathers arranged in the vicinity of the inguinal region. can.
  • the sanitary non-woven fabric when using sanitary products such as absorbent articles, is worn at an appropriate position from the viewpoint of perceiving a feeling of coldness and reducing discomfort due to stuffiness and the like.
  • the fabric is arranged so as to form a surface facing the skin of the wearer who wears the hygienic product of the absorbent article (hereinafter, this is also referred to as a “skin facing surface”).
  • the hygienic non-woven fabric is arranged at a portion where the hygienic product of the absorbent article and the skin of the wearer come into direct contact with each other when worn.
  • the constituent members of such an absorbent article include a surface sheet, a side non-woven fabric, waist gathers, gathers arranged in the vicinity of the inguinal region, and the like.
  • the front surface sheet used for the absorbent article is a sheet constituting the skin facing surface side
  • the back surface sheet is a surface facing the side opposite to the skin of the wearer who wears the absorbent article (hereinafter, this is referred to as "non-skin"). It is a sheet that constitutes the side facing the skin.
  • non-skin a non-woven fabric for sanitary use of the present invention
  • those conventionally used for the absorbent article can be used without particular limitation.
  • the surface sheet for example, various liquid-permeable non-woven fabrics, perforated films, and the like can be used.
  • the back surface sheet a liquid impervious or water repellent or liquid permeable sheet can be used. Examples of the former include a resin film and a laminate of a resin film and a non-woven fabric or the like. The latter can be the same as the surface sheet.
  • the absorber used in the absorbent article comprises an absorbent core.
  • the absorbent core is composed of, for example, a laminated fiber of hydrophilic fibers such as cellulose such as pulp, a mixed fiber of the hydrophilic fiber and a water-absorbent polymer, a deposit of a water-absorbent polymer, and the like, and is typically composed of. Includes hydrophilic fibers and water-absorbing polymers.
  • the absorbent core may be covered with a core wrap sheet.
  • a coating mode of the core wrap sheet for example, at least the skin facing surface thereof may be covered with a liquid-permeable core wrap sheet, and the entire surface including the skin facing surface and the non-skin facing surface is covered with the core wrap sheet. It may be covered.
  • the core wrap sheet for example, thin paper made of hydrophilic fibers, a non-woven fabric having liquid permeability, or the like can be used.
  • the fiber diameter of the fibers used in the sanitary non-woven fabric is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, from the viewpoint that the constituent fibers do not cling to the skin and the user's tactile sensation is kept good. Further, from the viewpoint of reducing the fiber gaps in the non-woven fabric, reducing the air content in the non-woven fabric, and increasing the thermal conductivity, it is preferably 70 ⁇ m or less, more preferably 50 ⁇ m or less.
  • the fiber diameter of the fiber is measured by preparing a measurement sample and observing SEM in the same manner as the measurement method for each length of the major axis and the minor axis in the cross-sectional shape of the fiber, and measuring the fiber diameter of 10 fibers per sample.
  • the arithmetic average value is used as the fiber diameter of the present invention.
  • the length of each of the major axis and the minor axis of the fiber is measured by the above method, and the arithmetic average value of the major axis length and the minor axis length of one fiber is calculated as the fiber diameter.
  • the arithmetic average value of 10 fibers of the fiber diameter is defined as the fiber diameter of the fiber in the present invention.
  • the sanitary nonwoven fabric of the present invention may further contain a filler for increasing the thermal conductivity.
  • a filler include at least one such as titanium oxide, alumina, boron nitride, magnesium oxide, silica, carbon black, and carbon nanotubes.
  • the filler may be present in the fiber, may be present between the fibers, may be partially exposed on the fiber surface, and may be embedded in the fiber inside the fiber.
  • the sanitary product is a sanitary non-woven fabric in which at least a part of the surface is an aggregate of fibers made of polyethylene resin (hereinafter, this is referred to as "first” for convenience of explanation.
  • first an aggregate of fibers made of polyethylene resin
  • second member another member (hereinafter, this member may also be referred to as a “second member”) may be provided.
  • a hygienic product to which the second member is arranged for example, as the second member, at least one of an absorbent sheet containing an absorbent polymer and a fiber, an absorbent body containing an absorbent polymer and a fiber, and the like are used. Can be used. These are examples of fiber aggregates different from sanitary non-woven fabrics.
  • the above-mentioned absorbent article is preferably mentioned. That is, in the present embodiment, the sanitary non-woven fabric, which is the first fiber aggregate, and the absorbent sheet and / or the absorbent body, which are the second members, are arranged as the constituent materials of the sanitary product.
  • first fiber assembly and the second member are arranged adjacent to each other.
  • the fiber aggregates in this embodiment may or may not be joined to each other.
  • the absorbent sheet for example, the absorbent sheet described in JP-A-8-246395 can be used.
  • the second member or the second fiber layer whose thickness change is equal to or more than a predetermined value shall be used.
  • the amount of compressive deformation of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.5 mm or more. Further, the amount of compressive deformation of the second member under the same load is preferably 3 mm or less.
  • the amount of change in compression is expressed as the amount of change obtained by subtracting the thickness of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2) from the thickness of the second member under no load. Will be done. It is preferable that the second fiber layer constituting the sanitary non-woven fabric has the same amount of compressive deformation. In addition to this, when the sanitary product includes both the sanitary non-woven fabric having a multi-layer structure and the second member, it is preferable that both the second member and the second fiber layer satisfy the above-mentioned compression deformation amount, respectively.
  • the first fiber aggregate containing fibers whose surface is at least partly made of polyethylene resin touches the wearer the first fiber aggregate undergoes deformation of the second member. It can be easily deformed to follow and increase the contact area with the wearer so that the wearer can efficiently perceive the feeling of coldness.
  • the second fiber layer having the above-mentioned physical properties is, for example, a fiber subjected to air-through treatment using a fiber made of PET resin or PP resin as a constituent fiber, a PET / HDPE core-sheath composite fiber, or the like in the manufacturing method described later. It can be obtained by using the web.
  • the second member is an absorbent sheet or an absorbent body, it can be obtained, for example, by appropriately adjusting the basis weight of the fibers, the fiber sheet and the water-absorbing polymer constituting the absorbent sheet or the absorbent body.
  • the thickness of the second member or the second fiber layer can be measured by, for example, the following method.
  • the object to be measured is a sanitary product, after fixing the structure by immersing the sanitary product in liquid nitrogen, carefully select the sanitary non-woven fabric and the second member other than the sanitary non-woven fabric from the sanitary product to be measured. Peel off and separate.
  • the separated members are subjected to the measurement of the cool contact feeling q max described in detail in Examples described later, the fiber sheet having the highest q max value is used as a sanitary non-woven fabric, and the member adjacent to the sanitary non-woven fabric is used. It is used as the second member. Then, with a load of 9.8 mN / cm 2 (1 gf / cm 2 ) applied to the separated second member by placing a plate or the like, the thickness in that state is measured using a laser displacement meter. Then, this is taken as the thickness of the second member.
  • the fiber layer on the surface side having the highest q max value measured by the above method is the first fiber layer, and the fiber layer adjacent to the first fiber layer. Is used as the second fiber layer, and the second fiber layer is subjected to the above-mentioned measurement.
  • the amount of compressive deformation under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.4 mm or more in the entire hygienic product.
  • the amount of compressive deformation of the entire sanitary product under the same load is preferably 15 mm or less, more preferably 10 mm or less.
  • the above-mentioned amount of compression deformation is such that the temperature and wind speed of hot air are lower than those normally adopted, the number of fibers is increased, and a resin having a melting point higher than the temperature of hot air is used.
  • a resin having a melting point higher than the temperature of hot air is used.
  • two or more fiber layers are provided, and only one fiber layer is provided with a layer having a higher amount of compression deformation than the other fiber layers, or the basis weight of one fiber layer is determined. This can be easily achieved by adopting a structure in which the number of fibers is increased as compared with other fiber layers, or fibers having a high melting point are mixed with one fiber layer.
  • the amount of compression deformation can be measured using, for example, a KES-FB-3 compression tester manufactured by Kato Tech Co., Ltd. A section of a certain size is used as a sample from the sanitary non-woven fabric to be measured. The sample is mounted on the test bench of the testing machine and compressed between steel plates having a circular plane with an area of 2 cm 2. The compression rate is 0.02 mm / sec, and the maximum compression load is 9.8 mN / cm 2 (1 gf / cm 2 ). When the thickness under no load is T0 (mm) and the thickness is 9.8 mN / cm 2 (1 gf / cm 2 ), the thickness under load is Tm (mm). It can be calculated as "T0-Tm" obtained by subtracting the thickness Tm from.
  • the total basis weight is preferably 40 g / m 2 or more, more preferably 60 g / m 2 or more, further preferably 70 g / m 2 or more, and preferably 500 g / m 2 or less. , More preferably 400 g / m 2 or less, still more preferably 300 g / m 2 or less.
  • the total basis weight is preferably 30 g / m 2 or more, more preferably 40 g / m 2 or more, further preferably 50 g / m 2 or more, and preferably 600 g / m 2 or less. , More preferably 550 g / m 2 or less, still more preferably 500 g / m 2 or less.
  • This manufacturing method includes a step (air-through step) of obtaining a fiber aggregate by performing an air-through treatment on a web of fibers whose surface is at least partly made of polyethylene resin.
  • a step of performing a consolidation treatment on the obtained fiber aggregate (consolidation step).
  • the fiber used in the present production method has a thermal conductivity in the range of the above-mentioned values.
  • the surface forms a web of fibers made of polyethylene resin.
  • the fiber web can be formed, for example, by a card method using a known card machine.
  • an air-through treatment is performed in which hot air is blown onto the fiber web to obtain an aggregate of fibers whose surface is at least partly made of polyethylene resin.
  • This step is a step of making a web of fibers into a non-woven fabric, and the fiber aggregate thus produced is generally called an air-through non-woven fabric.
  • a core-sheath fiber having a polyethylene resin as a sheath and a refractory resin other than the polyethylene resin as a core is mainly used from the viewpoint of manufacturing efficiency. It is very difficult to make a fiber composed of chisel into a polyethylene by air-through processing.
  • the use of core-sheath fibers is advantageous in that it enhances the texture and strength of the obtained air-through non-woven fabric, but there is room for improvement in that the user perceives a feeling of coldness due to the improvement in thermal conductivity. there were.
  • the temperature and the wind speed of the hot air blown to the fiber web are within a specific range.
  • the temperature of the hot air blown onto the fiber web is preferable from the viewpoint of improving the texture of the obtained sanitary non-woven fabric in relation to the melting point M (° C.) of the resin constituting the fiber surface constituting the fiber web.
  • the temperature of the hot air blown to the fiber web is preferably the melting point M-4 ° C. or higher. It can be more preferably in the range of melting point M-2 ° C. or higher, more preferably in the range of melting point M or higher.
  • the temperature of the hot air described above is the temperature at the outlet of the hot air. This temperature can be measured, for example, by attaching a thermocouple to the outlet or as close as possible to it.
  • the temperature of the hot air is preferably 126 ° C. or higher, more preferably 128 ° C. or higher, still more preferably 128 ° C. or higher.
  • the temperature can be 130 ° C. or higher.
  • the temperature of the hot air under the above conditions can be preferably 134 ° C. or lower, more preferably 133 ° C. or lower, and even more preferably 132 ° C. or lower.
  • the melting point M of the resin constituting the fiber surface can be measured using a differential scanning calorimetry meter (DSC7000x, manufactured by Hitachi High-Tech Science Co., Ltd.). First, using a finely cut fiber sample (1 mg), thermal analysis of the sample is performed at a heating rate of 10 ° C./min, and the melting peak temperature of each resin is measured. The melting point is defined by the melting peak temperature at the first temperature rise. If the melting point cannot be clearly measured by this method, this resin is defined as "resin having no melting point". In the case of a resin having no melting point, the softening point is defined as the melting point M.
  • DSC7000x differential scanning calorimetry meter
  • the wind speed of the hot air blown to the fiber web is preferably 0.6 m / sec or more from the viewpoint of allowing the hot air to sufficiently pass in the thickness direction of the fiber web and facilitating the formation of fusion between the fibers. More preferably, it is 1 m / sec or more. From the same viewpoint, the wind speed of the hot air blown to the fiber web is preferably 2 m / sec or less, more preferably 1.4 m / sec or less.
  • the transport speed of the fiber web in the air-through step is preferably 3 m / min or more, more preferably 10 m / min or more, preferably 200 m / min or less, still more preferably 160 m / min or less in the above temperature and wind speed ranges. Is.
  • the fiber aggregate obtained through the above steps is made into a non-woven fabric, it may be used as it is as the non-woven fabric for hygiene of the present invention.
  • This sanitary non-woven fabric is an air-through non-woven fabric.
  • consolidation step a method capable of pressurizing and compressing the fiber aggregate in the thickness direction thereof can be adopted.
  • the consolidation treatment for example, a method of arranging a fiber aggregate between two metal flat plates and applying pressure (hereinafter, this method is also referred to as a "press method") or introducing a fiber aggregate between a pair of rolls. It can be carried out by a method of pressurizing (hereinafter, this method is also referred to as a "calendar method").
  • the consolidation treatment may be performed only once, or may be performed a plurality of times by the same or different methods as required. Further, the temperature in the consolidation treatment may be room temperature, a heated state, or a combination thereof.
  • the pressurizing conditions in the consolidation treatment are expressed in terms of surface pressure when the press method is used, from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 5 MPa or more, more preferably 10 MPa or more. Further, from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film, it is added in the consolidation treatment.
  • the pressure condition can be expressed in terms of surface pressure, preferably 72 MPa or less, and more preferably 32 MPa or less.
  • the pressurizing condition when the calendar method is adopted is expressed in linear pressure from the viewpoint of sufficiently compacting the fiber aggregate to facilitate obtaining a sanitary non-woven fabric having a high volume filling rate, preferably 78. It is 4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more.
  • the calendar method was adopted from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film.
  • the pressurizing condition at this time is preferably 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less in terms of linear pressure.
  • the heating temperature in the consolidation treatment can be set by either the press method or the calendar method from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 70 ° C. or higher, more preferably 80 ° C. or higher. Either the press method or the calendar method is used from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film. Even in the case of, the temperature can be preferably 120 ° C. or lower, more preferably 110 ° C. or lower.
  • the metal flat plate may be heated to the above temperature range in the press method, and the peripheral surface of the roll may be heated to the above temperature range in the calendar method.
  • the pressurization time in the consolidation treatment can be appropriately set as long as the fiber shape of the fibers constituting the fiber aggregate is maintained and the consolidation is possible.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 5 seconds or longer, more preferably 10 seconds or longer per consolidation treatment.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 25 seconds or less, more preferably 20 seconds or less per consolidation treatment.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.01 seconds or more, more preferably 0.04 seconds or more per consolidation treatment. ..
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.1 seconds or less, more preferably 0.08 seconds or less per consolidation treatment. ..
  • the fiber aggregate By performing the consolidation treatment under the above conditions, the fiber aggregate can be compressed in the thickness direction to easily obtain a sanitary non-woven fabric having a predetermined volume filling rate.
  • the morphological stability and dimensional stability due to heat treatment can be improved while the fiber constituent resin is unlikely to melt, so that a predetermined volume filling rate can be maintained even after production.
  • a maintained non-woven fabric for hygiene can be obtained.
  • the cross-sectional shape of the fiber can be flattened by the consolidation treatment, so that there is an advantage that the volume filling rate can be increased.
  • the sanitary non-woven fabric obtained by the above method is an air-through non-woven fabric even after undergoing a consolidation treatment.
  • the non-woven fabric for hygiene of the present invention can be produced by a method based on the spunbond method instead of the above-mentioned production method.
  • the sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric. Specifically, the raw material resin of the fiber is extruded from a spinneret having a large number of pores in a molten state, and the extruded resin is stretched with a roll or the like to form long fibers, and these long fibers are accumulated on a net conveyor. To obtain a web of fibers in which at least a part of the surface is made of polyethylene resin.
  • a fiber web is introduced between the emboss rolls and compacted (thermocompression bonding) by heating and pressurizing to obtain the sanitary nonwoven fabric of the present invention. That is, in this method, the non-woven fabric of the fiber web and the consolidation treatment are performed at the same time.
  • the temperature and pressurizing conditions in the embossed roll can be in the same range as the conditions of the consolidation treatment described above.
  • a second fiber web containing a thermoplastic resin formed by the card method is used, and a fiber web having at least a part of its surface made of polyethylene resin is used.
  • a laminated body of fiber web is formed.
  • an air-through non-woven fabric which is a fiber aggregate having a multi-layer structure can be obtained.
  • the temperature of the hot air to be blown is determined by setting the melting point of the resin having the lowest melting point as the above-mentioned melting point M.
  • a fiber web in which at least a part of the surface is made of polyethylene resin and a second fiber web containing a thermoplastic resin are each air-through treated to form a fiber sheet. After obtaining, these fiber sheets can be obtained by joining them with an adhesive.
  • the fiber aggregate obtained through the above steps may be used as it is as the sanitary nonwoven fabric of the present invention.
  • the consolidation step may be performed under the above-mentioned conditions.
  • the non-woven fabric of interest can also be produced by a method based on the spunbond method.
  • the above-mentioned second fiber web may be laminated on a fiber web in which at least a part of the surface is made of polyethylene resin, and in that state, consolidation (thermocompression bonding) by heating and pressurization may be performed. ..
  • the sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric.
  • the sanitary nonwoven fabric of the present invention can be obtained.
  • This sanitary non-woven fabric is preferably incorporated as a constituent member of a sanitary product such as an absorbent article in a subsequent step.
  • the sanitary non-woven fabric manufactured by the above method is used as one of the constituent materials in any of the steps for manufacturing the sanitary product.
  • One or more of the steps of cutting the sanitary non-woven fabric and performing various operations such as laminating or joining the sanitary non-woven fabric and other constituent materials (for example, an absorber or a sheet) constituting the sanitary product. In preparation for this, it is possible to manufacture a sanitary product such as a target absorbent article.
  • a sanitary nonwoven fabric as a first fiber aggregate is used at any stage of the manufacturing process of the sanitary product.
  • the above-mentioned absorbent body and absorbent sheet may be laminated or joined in a state of being adjacent to each other.
  • the sanitary non-woven fabric may be arranged so as to form a surface facing the wearer's skin when wearing the sanitary product, or may be arranged on the surface side not facing the wearer's skin when wearing the sanitary product. May be good.
  • the following sanitary nonwoven fabric, an absorbent article provided with the same, and a method for producing the sanitary nonwoven fabric are disclosed.
  • At least part of the surface contains fibers made of polyethylene resin, A sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 10% or more, still more preferably 14% or more.
  • At least a part of the surface contains fibers having a thermal conductivity of 0.11 W / mK or more, more preferably 0.13 W / mK or more, and even more preferably 0.15 W / mK or more.
  • a sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 14% or more.
  • the fiber contains (i) a low melting point component made of polyethylene resin on both the outer surface and the inside of the fiber, or (ii) a low melting point component made of polyethylene resin, and a high melting point component having a melting point higher than that of the low melting point component.
  • the content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is 70% by mass or more and 100% by mass or less, preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 100% by mass or less.
  • ⁇ 6> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 5>, wherein the resin constituting the fiber is only polyethylene resin.
  • the cross-sectional shape of the fiber has a major axis and a minor axis, and has a major axis and a minor axis. Any one of ⁇ 1> to ⁇ 6>, wherein the ratio of the length of the major axis to the length of the minor axis (length of the major axis / length of the minor axis) is 1.5 or more and 10 or less.
  • ⁇ 8> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>, wherein the fibers are in contact with each other at a plurality of points in a cross-sectional view.
  • ⁇ 9> 4.9 mN / cm 2
  • ⁇ 10> 4.9 mN / cm 2
  • ⁇ 11> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 10>, wherein the basis weight is 15 g / m 2 or more and 140 g / m 2 or less.
  • ⁇ 12> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 11>, wherein the basis weight is 25 g / m 2 or more and 50 g / m 2 or less.
  • ⁇ 13> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 12>, wherein the polyethylene resin contains a high-density polyethylene resin, and preferably consists only of the high-density polyethylene resin.
  • ⁇ 14> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 13>, wherein the fiber diameter of the fiber is 3 ⁇ m or more, preferably 5 ⁇ m or more.
  • ⁇ 15> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 14>, wherein the fiber diameter of the fiber is 70 ⁇ m or less, preferably 50 ⁇ m or less.
  • ⁇ 16> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 15>, which is an air-through non-woven fabric.
  • ⁇ 17> A hygienic product comprising the non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16>.
  • ⁇ 18> The hygienic product according to ⁇ 17>, wherein the hygienic non-woven fabric constitutes a surface facing the skin of the user of the hygienic product.
  • ⁇ 19> The hygienic product according to ⁇ 17> or ⁇ 18>, which is an absorbent article.
  • ⁇ 20> The hygiene product according to any one of ⁇ 17> to ⁇ 19>, wherein the hygiene non-woven fabric is arranged on the outer surface of the hygiene product.
  • ⁇ 21> The sanitary non-woven fabric or sanitary product according to any one of ⁇ 1> to ⁇ 20>, which is disposable.
  • the web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
  • the consolidation treatment is carried out at a surface pressure of 5 MPa or more, preferably 10 MPa or more, or 78.4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more.
  • the method for producing a sanitary nonwoven fabric according to the above ⁇ 22> which is carried out at linear pressure and at 70 ° C. or higher and 120 ° C. or lower.
  • the consolidation treatment is carried out at a surface pressure of 30 MPa or less, preferably 20 MPa or less, or a linear pressure of 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less.
  • ⁇ 25> The method for producing a sanitary nonwoven fabric according to any one of ⁇ 22> to ⁇ 24>, wherein the consolidation treatment is performed at 80 ° C. or higher and 110 ° C. or lower.
  • ⁇ 26> In the air-through treatment, hot air having a melting point of -4 ° C or higher and a melting point of the resin of + 4 ° C or lower of the resin constituting the fiber surface is blown onto the web at a wind speed of 0.6 m / sec or higher and 2 m / sec or lower.
  • the air-through treatment is more preferably performed by blowing hot air having a melting point of -2 ° C. or higher and a melting point of + 2 ° C. or lower of the resin constituting the fiber surface onto the web, according to any one of ⁇ 22> to ⁇ 26>.
  • the method for producing a sanitary nonwoven fabric according to 1. The surface of the fiber is made of high-density polyethylene resin, The high-density polyethylene resin has a melting point of 130 ° C.
  • Non-woven fabric manufacturing method. ⁇ 29>
  • the surface of the fiber is made of high-density polyethylene resin, The high-density polyethylene resin has a melting point of 130 ° C.
  • a sanitary nonwoven fabric manufactured by the method for manufacturing a sanitary nonwoven fabric according to any one of ⁇ 22> to ⁇ 30> is used as one of the constituent materials.
  • ⁇ 32> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 16>, wherein the cool contact feeling q max is 0.06 W / m 2 or more.
  • ⁇ 33> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32>, wherein the presence ratio of the constituent fibers on the surface of the sanitary nonwoven fabric is 40% or more based on the area.
  • ⁇ 34> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 16>, ⁇ 32>, and ⁇ 33>, wherein the volume filling rate is 10.0% or more.
  • the non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32> to ⁇ 34> and a second member arranged adjacent to the non-woven fabric are provided.
  • the second member is a sanitary product having a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
  • ⁇ 36> The sanitary product according to ⁇ 35>, wherein the second member is a fiber aggregate different from the sanitary non-woven fabric.
  • ⁇ 37> The hygienic product according to ⁇ 36>, wherein the second member is an absorber.
  • ⁇ 38> The method for producing a non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32> to ⁇ 34>.
  • the web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
  • Examples 1 to 5 A flat and multi-leaf shape (hereinafter, this shape is also referred to as a "flat variant”) having a long axis and a short axis in cross-sectional shape, which is made of a single resin of HDPE, was used. ..
  • the ratio of the length of the major axis, the length of the minor axis, and the length of the minor axis to the length of the minor axis in the fiber cross section is , As shown in Table 1 below. First, the web of the fibers adjusted to have the basis weight shown in Table 1 below was air-through treated to obtain a non-woven fiber aggregate.
  • the conditions for the air-through treatment were as shown in Table 1 below. Then, by the press method, the fiber aggregate was compacted under the heating and pressurizing conditions shown in Table 1 below to obtain the desired sanitary non-woven fabric. All of the obtained non-woven fabrics were of a single layer.
  • Examples 6 to 8 In the same manner as in Examples 1 to 5, except that the basis weight was adjusted to be as shown in Table 1 below, and the consolidation treatment was performed by the calendar method under the heating and pressurizing conditions shown in Table 1 below. The desired sanitary non-woven fabric was obtained. All of the obtained non-woven fabrics were of a single layer.
  • Example 9 A core-sheath fiber having a core of PET, a sheath (fiber surface) of HDPE, and a cross-sectional shape of a perfect circle was used (hereinafter, this is also referred to as PET / HDPE fiber).
  • the polyethylene resin content of this fiber was 50% by mass.
  • the fiber web made of these fibers was subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric.
  • the obtained non-woven fabric was of a single layer.
  • Example 10 A fiber made of a single resin of HDPE and having a perfect circular cross-sectional shape was used.
  • the web of the fiber adjusted to have the basis weight shown in Table 1 below is manufactured by the spunbond method, and the web is compacted by embossing roll to obtain a sanitary nonwoven fabric made of spunbonded non-woven fabric. Obtained.
  • the conditions of the spunbond method are as shown in Table 1 below.
  • the obtained non-woven fabric was of a single layer.
  • Example 11 The desired sanitary non-woven fabric was obtained in the same manner as in Example 1 except that the consolidation treatment was not performed.
  • Example 12 to 14 A core-sheath fiber having a core of PP, a sheath (fiber surface) of HDPE, and a perfect circular cross-sectional shape was used (hereinafter, this is also referred to as PP / HDPE fiber).
  • the polyethylene resin content of this fiber was 50% by mass.
  • a web of the fibers adjusted to have the basis weight shown in Table 1 below is formed, and this web is subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric. Obtained. All of the obtained non-woven fabrics were of a single layer.
  • Example 1 A web of fibers was formed using the same core-sheath fibers as in Example 9, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
  • Example 2 A web of fibers was formed using the same core-sheath fibers as in Example 12, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
  • Example 3 A web of fibers is formed using the same core-sheath fibers as in Example 12, air-through treatment is performed under the conditions shown in Table 1 below, and then compaction by the calendar method is performed without heating under the conditions shown in Table 1 below. The chemical treatment was carried out to obtain the desired sanitary non-woven fabric.
  • the heating was performed based on the melting point of the resin having the highest melting point. Specifically, the non-woven fabric composed of HDPE-only fibers was heated at 150 ° C., the non-woven fabric composed of PP / HDPE fibers was heated at 180 ° C., and the non-woven fabric composed of PET / HDPE fibers was heated at 300 ° C. Next, when the gauge pressure of 200 kgf (total mass including the top plate: 21848 kg; pressure is calculated as the surface pressure) of the obtained fused product while maintaining the above-mentioned heating temperature, the area of the fused product is the melting of the resin.
  • the surface pressure is calculated based on the area of the finally obtained circular resin plate. For example, when the circular resin plate has a diameter of 15 cm, the surface pressure is 12 MPa.) After holding for 1 minute, the mixture was water-cooled to 20 ° C. while maintaining the pressurized state to obtain a circular resin plate having a diameter of about 15 to 20 cm (the diameter of the obtained circular resin plate changes depending on the melt viscosity of the resin). sell).
  • the circular resin plate was cut radially through the center, and further cut so as to be 5 cm or less if the maximum delivery length was 5 cm or more. Then, the cut resin plates are placed on top of each other in the center of the SUS plate so that the extending directions of the virtual line segments at the maximum delivery length are random so as to eliminate the influence of the resin orientation, and then the thickness is 1 mm.
  • Two shims were arranged in parallel at a position 10 cm from the center of the SUS plate, and the SUS plate was placed on the shims. After that, heating under no pressurization, and heating and cooling under pressurization were performed by the same operation as described above. When air bubbles entered, the same operation was repeated. The purpose of heating and melting twice is to melt the sample once, eliminate the influence of resin crystallization that changes during the fiber spinning process, and keep the thermal history constant. This gave a film.
  • the thermal conductivity was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.). First, the prepared film was cut into a circle with a diameter of 17 cm and left to stand in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Then, the thermal conductivity of the object to be measured was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, the temperature of the heat source body for measurement (BT-BOX, an aluminum plate measuring 5 cm in length ⁇ 5 cm in width and 1 mm in thickness and a heater, etc. are integrated) is set to 33 ° C. (from the surface temperature of the object to be measured).
  • BT-BOX an aluminum plate measuring 5 cm in length ⁇ 5 cm in width and 1 mm in thickness and a heater, etc. are integrated
  • the temperature was set to 10 ° C. higher), and the heat source body was brought into contact with the film so as to apply a load of 1 kg per 0.25 m 2 of area to prevent the film from warping and reducing the contact area. ..
  • the time when the heat flow rate from the heat source body to the measurement target became constant was set as the measurement start time point, and the average heat flow rate for 60 seconds from that time point was measured. It was calculated from the measurement conditions and the measured heat flow rate based on the following formula (I).
  • the film thickness D was an arithmetic mean value of the thickness measured at three or more points under no load by a laser displacement meter.
  • the above measurement was performed three times for each measurement target, and the maximum value of those measured values was taken as the thermal conductivity (W / mK) of the sample.
  • the results are shown in Table 1.
  • the thickness D and the thermal conductivity of the film produced by the above method using only PET and the film produced by the above method using only PP were measured.
  • the results are shown in Table 2 together with the results of Examples and Comparative Examples.
  • the cool contact feeling q max was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.).
  • a test piece was cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece was left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Then, in this environment, the test piece was placed on the measuring table, and the test piece was fixed to the measuring table using double-sided tape.
  • a constant temperature device using a gas or liquid as a heat medium was used as the measuring table.
  • the cool contact feeling q max of the measurement target was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target).
  • the contact pressure of the copper plate to the measurement target was set to 1 kPa, the copper plate was brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact was set to zero, and the maximum value of the heat flow rate was measured.
  • the sanitary non-woven fabrics of each example have high thermal conductivity and volume filling rate, and also have a high contact cooling sensation q max, as compared with those of the comparative examples. It turns out. In particular, as shown in Examples 1 to 8, it can be seen that this effect becomes remarkable by using flat irregularly shaped fibers. Therefore, the sanitary nonwoven fabric of the present invention can perceive a feeling of coldness when it comes into contact with the skin of the user, and can give a comfortable feeling of use.
  • Example 15 and 16 The air-through non-woven fabric made of a single resin of HDPE used in Example 2 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 2.
  • Example 17 to 21 The air-through non-woven fabric made of a single resin of HDPE used in Example 4 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 4.
  • Example 22 The air-through non-woven fabric made of a single resin of HDPE used in Example 10 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used. It was used as the second fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers).
  • the first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 10.
  • volume filling factor For the sanitary nonwoven fabric of the example, the volume filling rate (%) was calculated in the same manner as in the above method. The results are shown in Table 3 below. Table 3 reprints the results of only the sanitary non-woven fabrics in Examples 2, 4 and 10.
  • a feeling of coldness is as strong as that of a fiber sheet having a q max of 0.15 or more, and the feeling of coldness is very excellent.
  • the sanitary non-woven fabrics of each example have a high volume filling rate and a high contact cooling sensation q max, and can perceive an excellent cooling sensation.
  • the fiber surface abundance rate (%) was calculated by the above method.
  • the fiber surface abundance rate of Example 9 was 58%
  • the surface fiber abundance rate of Comparative Example 1 was 36%. Therefore, the fiber surface abundance rate of Example 9 is higher than that of Comparative Example 1, and the contact property of the fiber with respect to the contact object can be further enhanced. As a result, an excellent feeling of coldness can be perceived.
  • a sanitary non-woven fabric that perceives a feeling of coldness when it comes into contact with the skin and gives a comfortable feeling of use, and a hygienic product and an absorbent product provided with the non-woven fabric for hygiene.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Textile Engineering (AREA)
  • Dermatology (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

This non-woven fabric for hygiene contains fibers at least a part of the surface of which comprise a polyethylene resin, and has a volume filling ratio of at least 3.5%. The fibers have a long axis and a short axis, and it is preferable that the ratio of the length of the long axis to that of the short axis be 1.5–10. It is preferable for the fibers to come into mutual contact at a plurality of points in a cross-section of the non-woven fabric. The present invention also provides an absorbent article provided with the non-woven fabric for hygiene. Furthermore, the present invention also provides a method for manufacturing the non-woven fabric for hygiene, in which air-through treatment and consolidation treatment are applied to a web of fibers, at least a part of the surface of which comprises a polyethylene resin.

Description

衛生用不織布並びにこれを備える衛生品及び吸収性物品、並びに衛生用不織布の製造方法Sanitary non-woven fabrics, sanitary products and absorbent articles equipped with them, and methods for manufacturing sanitary non-woven fabrics.
　本発明は、衛生用不織布並びにこれを備える衛生品及び吸収性物品、並びに衛生用不織布の製造方法に関する。 The present invention relates to a non-woven fabric for hygiene, a sanitary product and an absorbent article provided with the non-woven fabric for hygiene, and a method for producing the non-woven fabric for hygiene.
　冷感を知覚させることができる繊維シートや該繊維シートを備える物品が提案されている。例えば特許文献１には、夏場の暑熱感を解消するための衣料に用いられることを目的とした快適性布帛が開示されている。この布帛は、２０℃から３０℃における繊維軸方向の熱伝導率が５Ｗ／ｍＫ以上の有機高分子繊維を少なくとも１種類含み、２０℃から３０℃における布帛の厚み方向の熱伝導率が０．０８Ｗ／ｍＫ以上で、接触冷温感が０．１３Ｗ／ｃｍ２以上であることも同文献に開示されている。 A fiber sheet capable of perceiving a feeling of coldness and an article provided with the fiber sheet have been proposed. For example, Patent Document 1 discloses a comfort fabric intended to be used for clothing for eliminating the feeling of heat in summer. This cloth contains at least one kind of organic polymer fiber having a thermal conductivity of 5 W / mK or more in the fiber axis direction from 20 ° C. to 30 ° C., and has a thermal conductivity in the thickness direction of the cloth from 20 ° C. to 30 ° C. It is also disclosed in the same document that the contact cold temperature feeling is 0.13 W / cm 2 or more at 08 W / mK or more.
　特許文献２には、接触冷感特性に優れ、寝具や敷物に用いられるシート状繊維束集合体が開示されている。この集合体は、平均繊維長が１０～２００ｍｍの高分子ポリエチレン繊維を含むシート状物を複数枚積層して形成されたシート状からなるものである。 Patent Document 2 discloses a sheet-like fiber bundle aggregate which is excellent in cool contact characteristics and is used for bedding and rugs. This aggregate is formed by laminating a plurality of sheet-like materials containing high molecular weight polyethylene fibers having an average fiber length of 10 to 200 mm.
　また本出願人は、濡れた状態で肌と触れても不快感を与え難い吸収性物品用シートを提案した（特許文献３参照）。このシートは、疎水性繊維及びセルロース系繊維を含み、含水率５０質量％の状態での接触冷感ｑｍａｘが、シート両面共に２．５ｋＷ／ｍ２以下であるものである。 In addition, the applicant has proposed a sheet for absorbent articles that does not cause discomfort even when it comes into contact with the skin in a wet state (see Patent Document 3). This sheet contains hydrophobic fibers and cellulosic fibers, and has a cool contact feeling q max of 2.5 kW / m 2 or less on both sides of the sheet when the water content is 50% by mass.
特開２０１０－２３６１３０号公報Japanese Unexamined Patent Publication No. 2010-236130 特開２０１８－１４５５７７号公報Japanese Unexamined Patent Publication No. 2018-1455777 特開２０１９－４２４０３号公報Japanese Unexamined Patent Publication No. 2019-42403
　本発明は、衛生用不織布に関する。
　一実施形態では、前記衛生用不織布は、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含有する。
　一実施形態では、好ましくは前記衛生用不織布の体積充填率が３．５％以上である。 The present invention relates to a sanitary nonwoven fabric.
In one embodiment, the sanitary nonwoven fabric contains fibers whose surface is at least partly made of polyethylene resin.
In one embodiment, the volume filling rate of the sanitary nonwoven fabric is preferably 3.5% or more.
　また本発明は、前記衛生用不織布を備える、吸収性物品に関する。 The present invention also relates to an absorbent article comprising the sanitary nonwoven fabric.
　また本発明は、前記衛生用不織布を備える、衛生品に関する。
　一実施形態では、前記衛生品は、前記衛生用不織布と隣接して配された第２部材を備える。
　一実施形態では、前記第２部材は、９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重下での圧縮変形量が０．３ｍｍ以上である。 The present invention also relates to a hygienic product comprising the non-woven fabric for hygiene.
In one embodiment, the sanitary product comprises a second member arranged adjacent to the sanitary nonwoven fabric.
In one embodiment, the second member has a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
　更に本発明は、表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブにエアスルー処理を行って、繊維集合体を得る、衛生用不織布の製造方法に関する。
　一実施形態では、好ましくは、前記繊維集合体に圧密化処理を行う。
　本発明のその他の特徴は、特許請求の範囲及び以下の説明から明らかになるであろう。 Furthermore, the present invention relates to a method for producing a sanitary non-woven fabric, which obtains a fiber aggregate by performing an air-through treatment on a web of fibers having at least a part of the surface made of polyethylene resin.
In one embodiment, the fiber aggregates are preferably consolidated.
Other features of the invention will become apparent from the claims and the description below.
発明の詳細な説明Detailed description of the invention
　生理用ナプキンやパンティライナー等の身体から排出される液の吸収に用いられる吸収性物品等の衛生品は、不織布を含む複数の構成部材を組み合わせて構成されるところ、このような物品が使用前又は着用時に肌に触れると、着用者に温感を知覚させ、使用時の蒸れ等の不快感を想起させることがある。このことは、特に暑熱環境下において顕著となり得る。そのため、吸収性物品等の衛生品における肌と接触する部位は冷感を知覚させる構成が望まれる。 Hygiene products such as absorbent articles used to absorb liquid discharged from the body such as sanitary napkins and panty liners are composed by combining a plurality of constituent members including non-woven fabric. Alternatively, when the skin is touched during wearing, the wearer may perceive a feeling of warmth and may be reminded of discomfort such as stuffiness during use. This can be especially noticeable in hot environments. Therefore, it is desirable that the part of the hygienic product such as an absorbent article that comes into contact with the skin is configured to perceive a feeling of coldness.
　しかし、特許文献１及び２に記載の技術は、衣類や寝具などといった衛生品以外の物品に適用されるものであり、衛生品への適用については何ら検討されていない。 However, the techniques described in Patent Documents 1 and 2 are applied to articles other than hygienic products such as clothing and bedding, and their application to hygienic products has not been studied at all.
　特許文献３に記載の技術は、濡れた状態で肌と触れても不快感を与え難いものであるが、吸収性物品の使用前や、着用時且つ液吸収前における不快感の低減に関して改善の余地があった。 The technique described in Patent Document 3 is less likely to cause discomfort even when it comes into contact with the skin in a wet state, but it improves the reduction of discomfort before using an absorbent article, when wearing it, and before absorbing liquid. There was room.
　したがって、本発明は、肌に触れたときに冷感を知覚させて、心地良い使用感を与える衛生用不織布並びにこれを備える衛生品及び吸収性物品に関する。 Therefore, the present invention relates to a sanitary non-woven fabric that gives a comfortable feeling of use by perceiving a feeling of coldness when touching the skin, and a sanitary product and an absorbent article provided with the non-woven fabric for hygiene.
　以下本発明を、その好ましい実施形態に基づき説明する。
　本明細書において数値の上限値若しくは下限値又は上下限値が規定されている場合、上限値及び下限値そのものの値も含まれる。また特に明示がなくても、数値の上限値以下若しくは下限値以上又は上下限値の範囲内におけるすべての数値又は数値範囲が記載されているものと解釈される。
　本明細書において、「ａ」及び「ａｎ」等は、一又はそれ以上の意味に解釈される。
　本明細書における上述の開示及び以下の開示に照らせば、本発明の様々な変更形態や改変形態が可能であることが理解される。したがって、特許請求の範囲の記載に基づく技術的範囲内において、本明細書に明記されていない実施形態についても本発明の実施が可能であると理解すべきである。
　上述の特許文献及び以下の特許文献の記載内容は、それらのすべてが本明細書の内容の一部として本明細書に組み入れられる。 Hereinafter, the present invention will be described based on its preferred embodiment.
When the upper limit value or the lower limit value or the upper and lower limit values of the numerical value is specified in this specification, the value of the upper limit value and the lower limit value itself is also included. Further, even if not specified, it is interpreted that all numerical values or numerical ranges within the upper limit value or the lower limit value or the upper and lower limit values of the numerical values are described.
In the present specification, "a", "an" and the like are interpreted as one or more meanings.
In light of the above and the following disclosures herein, it is understood that various modifications and modifications of the invention are possible. Therefore, it should be understood that the present invention can be practiced even in embodiments not specified in the present specification within the technical scope based on the description of the claims.
The contents of the above-mentioned patent documents and the following patent documents are all incorporated in the present specification as a part of the contents of the present specification.
　本発明の衛生用不織布は、衛生品の構成部材として好適に用いられる。衛生品の典型例は、フェイスマスクやアイマスク等の衛生用品や、尿や経血等の体液を吸収する吸収性物品等であり、好ましくは吸収性物品である。
　衛生用不織布は、衛生品の着用時において着用者の肌と当接する面である肌当接面側に配されたり、あるいは、衛生品を取り扱う際に使用者の手等に触れる部位に配されたりする。
　衛生用不織布は、ここに記載された用途に特に限定されず適用可能である。 The non-woven fabric for hygiene of the present invention is suitably used as a constituent member of a sanitary product. Typical examples of hygienic products are hygienic products such as face masks and eye masks, and absorbent products that absorb body fluids such as urine and menstrual blood, and are preferably absorbent products.
The hygienic non-woven fabric is placed on the skin contact surface side, which is the surface that comes into contact with the wearer's skin when wearing the hygiene product, or is placed on the part that comes into contact with the user's hand when handling the hygiene product. Or something.
The sanitary nonwoven fabric is not particularly limited to the uses described herein and is applicable.
　本発明の衛生用不織布は、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含む繊維シートであり、好ましくは該繊維のみから構成されている。
　衛生用不織布の構成繊維どうしは、絡合、融着及び圧着の少なくとも一つによって、繊維シートの形態を維持している。したがって、本発明の衛生用不織布は、接触する構成繊維どうしの境界が明瞭となった形態を主に含んで構成されている。 The sanitary nonwoven fabric of the present invention is a fiber sheet containing fibers whose surface is at least partly made of polyethylene resin, and is preferably composed of only the fibers.
The constituent fibers of the sanitary nonwoven fabric maintain the morphology of the fiber sheet by at least one of entanglement, fusion and pressure bonding. Therefore, the sanitary nonwoven fabric of the present invention is mainly composed of a form in which the boundaries between the constituent fibers that come into contact with each other are clear.
　衛生用不織布に含まれる繊維は、繊維表面の少なくとも一部にポリエチレン樹脂を有する。本発明の衛生用不織布に含まれる繊維のポリエチレン樹脂の存在態様としては、（ｉ）繊維の外表面及び内部がともにポリエチレン樹脂からなる態様、すなわち繊維の構成樹脂がポリエチレン樹脂のみである態様や、（ii）ポリエチレン樹脂からなる低融点成分と、低融点成分よりも融点の高い高融点成分とを含み、低融点成分が繊維表面の少なくとも一部を長さ方向に連続して存在している二成分系の複合繊維の態様等が挙げられる。
　一般的に、ポリエチレン樹脂は、有機高分子材料の中でも熱伝導性が高いことが知られている。したがって、ポリエチレン樹脂自体が有する高い熱伝導性を発揮させるとともに、ポリエチレン樹脂とポリエチレン樹脂以外の樹脂との間に生じる界面に起因する熱伝導性の低下を抑制して、使用者に冷感を知覚させやすくする観点から、前記（ｉ）の態様を採用することが好ましい。 The fibers contained in the sanitary non-woven fabric have polyethylene resin on at least a part of the fiber surface. Examples of the existence mode of the polyethylene resin of the fiber contained in the non-woven fabric for sanitary use of the present invention include (i) a mode in which both the outer surface and the inside of the fiber are made of polyethylene resin, that is, a mode in which the constituent resin of the fiber is only polyethylene resin. (Ii) A low melting point component made of polyethylene resin and a high melting point component having a higher melting point than the low melting point component are contained, and at least a part of the fiber surface is continuously present in the length direction. Examples thereof include the mode of the component-based composite fiber.
In general, polyethylene resin is known to have high thermal conductivity among organic polymer materials. Therefore, the high thermal conductivity of the polyethylene resin itself is exhibited, and the decrease in thermal conductivity caused by the interface between the polyethylene resin and the resin other than the polyethylene resin is suppressed, so that the user feels a cool feeling. From the viewpoint of facilitating the process, it is preferable to adopt the aspect (i).
　前記（ｉ）の具体例としては、構成樹脂として単一種類のポリエチレン樹脂からなる繊維や、構成樹脂として複数種類のポリエチレン樹脂のみからなる繊維が挙げられる。前記（ii）の具体例としては、(a)高融点成分としてポリエチレン樹脂以外の樹脂を芯とし、芯の表面を覆うように、低融点成分としてポリエチレン樹脂の鞘が形成された芯鞘繊維や、(b)ポリエチレン樹脂を低融点成分とし、ポリエチレン樹脂以外の樹脂を高融点成分とし、低融点成分であるポリエチレン樹脂が繊維表面の少なくとも一部を繊維長さ方向に沿って連続して存在するサイドバイサイド繊維等が挙げられる。本発明に用いられる繊維は、中実であってもよく、中空であってもよい。熱伝導性を高めて使用者に冷感を知覚させやすくする観点から、好ましくは中実の繊維である。 Specific examples of the above (i) include fibers made of a single type of polyethylene resin as the constituent resin and fibers made of only a plurality of types of polyethylene resins as the constituent resin. Specific examples of the above (ii) include (a) a core sheath fiber in which a resin other than polyethylene resin is used as the core as the high melting point component and a polyethylene resin sheath is formed as the low melting point component so as to cover the surface of the core. , (B) Polyethylene resin is a low melting point component, resins other than polyethylene resin are high melting point components, and at least a part of the fiber surface is continuously present along the fiber length direction. Examples include side-by-side fibers. The fibers used in the present invention may be solid or hollow. It is preferably a solid fiber from the viewpoint of increasing thermal conductivity and making it easier for the user to perceive a feeling of coldness.
　繊維におけるポリエチレン樹脂の存在態様のうち、繊維の少なくとも外表面全域にポリエチレン樹脂を有していることが好ましく、繊維全体がポリエチレン樹脂で形成されていることが好ましい。つまり、ポリエチレン樹脂を鞘とした芯鞘構造を有する繊維であるか、又はポリエチレン樹脂のみからなる中実の繊維であることが好ましい。このような構成になっていることによって、熱伝導性の高いポリエチレン樹脂が使用者の肌に直接接触するので、使用者に冷感を強く知覚させることができる。 Among the modes of existence of the polyethylene resin in the fiber, it is preferable to have the polyethylene resin in at least the entire outer surface of the fiber, and it is preferable that the entire fiber is made of the polyethylene resin. That is, it is preferable that the fiber has a core-sheath structure with a polyethylene resin as a sheath, or is a solid fiber made of only polyethylene resin. With such a configuration, the polyethylene resin having high thermal conductivity comes into direct contact with the skin of the user, so that the user can strongly perceive a feeling of coldness.
　特に、衛生用不織布に存在する繊維は、その構成樹脂として、ポリエチレン樹脂のみからなる繊維であることが更に好ましい。熱伝導性の高いポリエチレン樹脂のみを用いることによって、熱伝導性が高くなるように繊維を構成しやすくできるので、使用者に冷感をより強く知覚させることができる。 In particular, the fibers present in the sanitary non-woven fabric are more preferably fibers made of only polyethylene resin as the constituent resin thereof. By using only the polyethylene resin having high thermal conductivity, the fibers can be easily configured so as to have high thermal conductivity, so that the user can perceive a feeling of coldness more strongly.
　本発明に用いられるポリエチレン樹脂としては、例えば、低密度ポリエチレン樹脂（ＬＤＰＥ）、中密度ポリエチレン樹脂（ＭＤＰＥ）、高密度ポリエチレン樹脂（ＨＤＰＥ）、及び直鎖状低密度ポリエチレン樹脂（ＬＬＤＰＥ）、並びにエチレン－プロピレン共重合体等が挙げられる。これらは単独で又は複数混合して若しくは組み合わせて用いることができる。
　ポリエチレン樹脂としてエチレン－プロピレン共重合体を用いる場合、共重合体中のエチレン単位の割合は、熱伝導性を高める観点から、好ましくは９５質量％以上、更に好ましくは９８質量％以上である。
　また、共重合体中のプロピレン単位の割合は、好ましくは５質量％以下、更に好ましくは２質量％以下である。 Examples of the polyethylene resin used in the present invention include low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (LLDPE), and ethylene. -Examples include propylene copolymer and the like. These can be used alone or in admixture or in combination.
When an ethylene-propylene copolymer is used as the polyethylene resin, the proportion of ethylene units in the copolymer is preferably 95% by mass or more, more preferably 98% by mass or more, from the viewpoint of enhancing thermal conductivity.
The proportion of the propylene unit in the copolymer is preferably 5% by mass or less, more preferably 2% by mass or less.
　ポリエチレン樹脂のみからなる繊維としては、ＨＤＰＥのみからなる繊維（すなわちＨＤＰＥが１００質量％である繊維）や、上述した各種ポリエチレンを複数用いた芯鞘繊維又はサイドバイサイド繊維が挙げられる。
　ポリエチレン樹脂のみを用いた芯鞘繊維又はサイドバイサイド繊維としては、例えば、芯及び鞘にそれぞれ融点が異なるＨＤＰＥを用いた繊維や、芯にＬＤＰＥ及びＬＬＤＰＥのうち一種以上を用い且つ鞘にＨＤＰＥを用いた芯鞘繊維、芯にＨＤＰＥを用い且つ鞘にＬＬＤＰＥを用いた芯鞘繊維、ＬＬＤＰＥを用いた繊維の表面の少なくとも一部にＨＤＰＥが長さ方向に沿って連続して存在するサイドバイサイド繊維等が挙げられる。
　ポリエチレン樹脂のみからなる繊維において、ポリエチレン樹脂の種類あるいは組み合わせについては、上述した内容に限定されず適用可能である。 Examples of the fiber made only of polyethylene resin include fibers made only of HDPE (that is, fibers having 100% by mass of HDPE), core-sheath fibers using a plurality of various polyethylenes described above, and side-by-side fibers.
As the core-sheath fiber or side-by-side fiber using only polyethylene resin, for example, a fiber using HDPE having a different melting point for the core and the sheath, or one or more of LDPE and LLDPE for the core and HDPE for the sheath was used. Examples include core-sheath fibers, core-sheath fibers using HDPE for the core and LLDPE for the sheath, and side-by-side fibers in which HDPE is continuously present along the length direction on at least a part of the surface of the fibers using LLDPE. Be done.
In the fiber made of only polyethylene resin, the type or combination of polyethylene resin is not limited to the above-mentioned contents and can be applied.
　これらのうち、熱伝導率が高い物性を有し、使用者に対して冷感をより強く知覚させることを可能にする観点から、ポリエチレン樹脂としてＨＤＰＥを含むことが好ましく、ＨＤＰＥのみからなることが更に好ましい。すなわち、ＨＤＰＥ単独で用いることが更に好ましい。 Of these, HDPE is preferably contained as the polyethylene resin, and may consist only of HDPE, from the viewpoint of having high thermal conductivity and enabling the user to perceive a feeling of coldness more strongly. More preferred. That is, it is more preferable to use HDPE alone.
　本発明に用いられるポリエチレン樹脂以外の樹脂としては、例えば、ポリプロピレン（ＰＰ）、ポリブテン等のポリエチレン樹脂以外のポリオレフィン樹脂、ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル樹脂、ポリアミド樹脂、ポリ塩化ビニルやポリスチレン等のビニル系樹脂、ポリアクリル酸やポリメタクリル酸メチル等のアクリル系樹脂、ポリパーフルオロエチレン等のフッ素樹脂、並びにナイロンなどが挙げられる。これらの樹脂は、一種を単独で又は二種以上を組み合わせて用いることができる。 Examples of the resin other than the polyethylene resin used in the present invention include polyolefin resins other than polyethylene resins such as polypropylene (PP) and polybutene, polyester resins such as polyethylene terephthalate (PET), polyamide resins, polyvinyl chloride and polystyrene. Examples thereof include vinyl resins, acrylic resins such as polyacrylic acid and polymethyl methacrylate, fluororesins such as polyperfluoroethylene, and nylon. These resins may be used alone or in combination of two or more.
　衛生用不織布に含まれる樹脂の全質量に対するポリエチレン樹脂の含有量は、好ましくは７０質量％以上、より好ましくは８０質量％以上、更に好ましくは９０質量％以上、一層好ましくは１００質量％以下であり、より一層好ましくは１００質量％である。 The content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass or less. , Even more preferably 100% by mass.
　本発明の衛生用不織布の別の実施形態として、該衛生用不織布は、熱伝導率が所定の値以上である繊維を表面の少なくとも一部に含有することが好ましい。
　詳細には、衛生用不織布は、熱伝導率が好ましくは０．１１Ｗ／ｍＫ以上、より好ましくは０．１３Ｗ／ｍＫ以上、更に好ましくは０．１５Ｗ／ｍＫ以上である繊維を表面の一部に含有することが好適である。
　また、衛生用不織布は、熱伝導率が０．４Ｗ／ｍＫ以下の繊維を表面の一部に含有することが現実的である。
　上述した熱伝導率は、例えば衛生用不織布を溶融させて、厚み１ｍｍ程度のフィルム状試料の形態にして測定することができる。詳細な測定方法は後述する。
　このような熱伝導率を有することによって、衛生用不織布を含む衛生品の使用者に冷感をより強く知覚させることができる。
　本実施形態における熱伝導率に関する構成は、上述した実施形態に代えて、又は上述した実施形態とともに採用することができる。
　また、本実施形態において説明しない点については、上述した実施形態及び各構成に関する説明を適宜適用することができる。 As another embodiment of the sanitary nonwoven fabric of the present invention, it is preferable that the sanitary nonwoven fabric contains fibers having a thermal conductivity of a predetermined value or more in at least a part of the surface.
Specifically, the sanitary non-woven fabric has fibers having a thermal conductivity of preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more as a part of the surface. It is preferable to contain it.
Further, it is realistic that the non-woven fabric for hygiene contains fibers having a thermal conductivity of 0.4 W / mK or less in a part of the surface.
The above-mentioned thermal conductivity can be measured, for example, by melting a sanitary non-woven fabric and forming it into a film-like sample having a thickness of about 1 mm. The detailed measurement method will be described later.
By having such a thermal conductivity, it is possible to make the user of the sanitary product including the sanitary non-woven fabric more strongly perceive the feeling of coldness.
The configuration relating to thermal conductivity in this embodiment can be adopted in place of or in conjunction with the above-described embodiment.
Further, with respect to the points not described in the present embodiment, the above-described description of the embodiment and each configuration can be appropriately applied.
　上述した熱伝導率を有する衛生用不織布は、例えば、上述した実施形態に用いられるポリエチレン樹脂のうち一種又は二種以上を含む繊維を、構成繊維として含んで構成することによって得ることができる。
　この場合、構成繊維の表面の少なくとも一部の熱伝導率が、好ましくは０．１１Ｗ／ｍＫ以上、より好ましくは０．１３Ｗ／ｍＫ以上、更に好ましくは０．１５Ｗ／ｍＫ以上である。このような熱伝導率を有する繊維を用いると、衛生用不織布における熱伝導率の範囲を容易に達成できる点から好ましい。
　また、構成繊維における上述の熱伝導率は、例えば、ポリエチレン樹脂のみからなる繊維を用いることによって、容易に達成することができる。 The above-mentioned sanitary nonwoven fabric having thermal conductivity can be obtained, for example, by including as a constituent fiber a fiber containing one or more of the polyethylene resins used in the above-described embodiment.
In this case, the thermal conductivity of at least a part of the surface of the constituent fibers is preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more. It is preferable to use a fiber having such a thermal conductivity from the viewpoint that the range of the thermal conductivity in the sanitary nonwoven fabric can be easily achieved.
Further, the above-mentioned thermal conductivity of the constituent fibers can be easily achieved by using, for example, a fiber made of only polyethylene resin.
　熱伝導率の測定は、例えば以下の方法で測定することができる。まず、測定対象となる不織布又は繊維をコールドスプレー等を用いて製品から剥離したり、あるいは繊維を採取するなどしたりして、分離する。次いで、分離した不織布又は繊維を、プレス機等の加温加圧設備に導入して、不織布又は繊維原料の融点以上の温度で加熱しながら加圧し、厚み１ｍｍ程度のフィルム状試料とする。このとき、試料中に空気が残存しないように、加圧条件を適宜調整する。
　そして、定常熱伝導率測定装置（ＫＥＳ－Ｆ６、カトーテック株式会社製）を用いて、３０℃の熱板から試料を介して２０℃の熱板へ移動した熱移動量に基づいて、熱伝導率を測定する。この測定を一つのフィルム状試料につき１０箇所測定し、これらのうち最も高い熱伝導率の値を、本発明における熱伝導率（Ｗ／ｍＫ）とする。 The thermal conductivity can be measured by, for example, the following method. First, the non-woven fabric or fiber to be measured is separated from the product by peeling it from the product using a cold spray or the like, or by collecting the fiber. Next, the separated non-woven fabric or fiber is introduced into a heating and pressurizing facility such as a press machine and pressed while heating at a temperature equal to or higher than the melting point of the non-woven fabric or fiber raw material to obtain a film-like sample having a thickness of about 1 mm. At this time, the pressurizing conditions are appropriately adjusted so that air does not remain in the sample.
Then, using a steady-state thermal conductivity measuring device (KES-F6, manufactured by Kato Tech Co., Ltd.), heat conduction is based on the amount of heat transferred from the hot plate at 30 ° C to the hot plate at 20 ° C via the sample. Measure the rate. This measurement is performed at 10 points per film-like sample, and the value of the highest thermal conductivity among these is defined as the thermal conductivity (W / mK) in the present invention.
　本発明の衛生用不織布は、その体積充填率が、熱伝導率の低い空気の含有量を低減し、該不織布の熱伝導率を向上させる観点から、好ましくは３．５％以上、より好ましくは７．０％以上、更に好ましくは１０．０％以上、より更に好ましくは１４．０％以上であり、一層好ましくは２０．０％以上である。
　また、使用者の肌と接触する使い捨て衛生用材料として用いる場合に、風合いを良好にする観点から、上述の体積充填率は、好ましくは６０．０％以下、より好ましくは５０．０％以下、更に好ましくは３０．０％以下である。
　上述した体積充填率を有していることによって、熱伝導性の低い空気の含有量が衛生用不織布内で少なくなるので、熱の移動性を高めることができ、これに起因して、使用者に冷感をより強く知覚させることができる。
　これに加えて、繊維シート及び該シートを組み込んだ衛生品としての風合いを十分に発現させることができる。
　上述した構成は、例えば後述する製造方法のように、繊維シートを圧縮等することによって得ることができる。衛生用不織布が密度勾配を有している場合には、使用者の肌に触れる最表面の層の体積充填率が上述の範囲であればよい。
　上述した体積充填率に関する構成は、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含有する衛生用不織布、構成繊維表面の熱伝導率が所定の値以上である衛生用不織布、及び不織布としての熱伝導率が所定の値以上である衛生用不織布の各実施形態に適用することができる。 The sanitary woven fabric of the present invention has a volume filling rate of preferably 3.5% or more, more preferably 3.5% or more, from the viewpoint of reducing the content of air having a low thermal conductivity and improving the thermal conductivity of the woven fabric. It is 7.0% or more, more preferably 10.0% or more, even more preferably 14.0% or more, still more preferably 20.0% or more.
Further, when used as a disposable hygiene material that comes into contact with the user's skin, the above-mentioned volume filling rate is preferably 60.0% or less, more preferably 50.0% or less, from the viewpoint of improving the texture. More preferably, it is 30.0% or less.
By having the above-mentioned volume filling factor, the content of air having low thermal conductivity is reduced in the sanitary non-woven fabric, so that the heat transfer can be improved, and due to this, the user. Can make you feel colder.
In addition to this, the texture of the fiber sheet and the hygienic product incorporating the sheet can be sufficiently expressed.
The above-described configuration can be obtained by compressing the fiber sheet or the like, for example, as in the manufacturing method described later. When the sanitary non-woven fabric has a density gradient, the volume filling rate of the outermost layer in contact with the user's skin may be within the above range.
The above-mentioned configuration regarding the volume filling rate includes a sanitary non-woven fabric containing fibers whose surface is at least partly made of polyethylene resin, a sanitary non-woven fabric having a heat conductivity on the surface of the constituent fibers of a predetermined value or more, and heat as the non-woven fabric. It can be applied to each embodiment of the sanitary nonwoven fabric having a conductivity of a predetermined value or more.
　本発明における体積充填率は、実体積に対する見かけ体積の百分率として表すことができる。詳細には、測定対象の衛生用不織布を所定面積切り取って測定サンプルとし、その質量（ｇ）を測定する。測定サンプルを切り取る際の所定面積は１０ｃｍ四方が好ましいが、その寸法にて測定サンプルを切り出せない場合は、測定対象となる衛生用不織布の坪量が目視にて均一である領域の中で、できる限り大きな領域となる幅及び長さで切り取る。そして、測定サンプルの坪量Ａ（ｇ／ｃｍ２）を算出する。
　また、測定サンプルの厚みＢ（ｃｍ）の測定方法は以下のとおりである。まず、１２．５９ｇ（直径５５ｍｍ）のプレートのみをレーザー変位計（株式会社キーエンス製、ＬＫ－０８０。本明細書におけるレーザー変位計は全てこれである。）に載置して、測定された厚みをゼロとしてゼロ点調整を行う。そして、測定サンプルの上に前記プレートを載置し、その状態での厚みをレーザー変位計を用いて測定し、これを測定サンプルの厚みＢ（ｃｍ）とする。厚みＢの測定では、プレートの載置によって、４．９ｍＮ／ｃｍ２の荷重が測定サンプルに付与されている。
　また、繊維の構成成分の密度Ｃ（ｇ／ｃｍ３）を用いて、以下の式から、体積充填率（％）を算出する。
　　体積充填率（％）＝１００×（Ａ）／（Ｂ×Ｃ）
　測定対象の衛生用不織布が、吸収性物品等の衛生品に組み込まれている場合は、該衛生品にコールドスプレーを吹きかけ、ホットメルト接着剤を固化させてから、測定対象の衛生用不織布を丁寧に剥がす。この手段は本明細書の他の測定においても共通である。 The volume filling factor in the present invention can be expressed as a percentage of the apparent volume with respect to the actual volume. Specifically, a predetermined area of the sanitary non-woven fabric to be measured is cut out to obtain a measurement sample, and the mass (g) thereof is measured. The predetermined area for cutting the measurement sample is preferably 10 cm square, but if the measurement sample cannot be cut out with that size, it can be done in a region where the basis weight of the sanitary non-woven fabric to be measured is visually uniform. Cut out with a width and length that will be the largest area. Then, the basis weight A (g / cm 2 ) of the measurement sample is calculated.
The method for measuring the thickness B (cm) of the measurement sample is as follows. First, only a plate of 12.59 g (diameter 55 mm) was placed on a laser displacement meter (LK-080 manufactured by KEYENCE CORPORATION. All laser displacement meters in the present specification are this), and the measured thickness was measured. Is set to zero and the zero point is adjusted. Then, the plate is placed on the measurement sample, and the thickness in that state is measured using a laser displacement meter, and this is defined as the thickness B (cm) of the measurement sample. In the measurement of the thickness B, a load of 4.9 mN / cm 2 is applied to the measurement sample by placing the plate.
Further, the volume filling rate (%) is calculated from the following formula using the density C (g / cm 3) of the constituent components of the fiber.
Volume filling rate (%) = 100 × (A) / (B × C)
If the hygiene non-woven fabric to be measured is incorporated into a hygienic product such as an absorbent article, spray a cold spray on the hygiene product to solidify the hot melt adhesive, and then carefully apply the hygiene non-woven fabric to be measured. Peel off. This means is common to other measurements herein.
　以上の構成を有する衛生用不織布は、合成樹脂のうち熱伝導性の高いポリエチレン樹脂を少なくとも表面の一部に有する繊維を用いるので、当該繊維と使用者の肌とが触れたときに、使用者の体温に起因する熱を、使用者から衛生用不織布に、あるいは使用者と接触していない他の繊維へ早く移動させることができる。
　これに加えて、衛生用不織布の体積充填率が所定の値の範囲となっていることによって、繊維シートとしての良好な風合いを発現させつつ、衛生用不織布内における熱伝導性が低い空気の含有量を少なくすることができるので、使用者から生じる熱を衛生用不織布側に早く移動させることができる。
　その結果、使用者の肌が衛生用不織布に触れたときに、使用者に対して冷感を知覚させて、冷感に起因する心地良い使用感を与えることができる。
　本発明の好適な態様によれば、使用者に対してより強く冷感を知覚させることができるので、使用感の更なる向上に寄与する。
　また、衛生用不織布が繊維の形態を含んで構成されていることによって、使用者の肌と衛生用不織布とが接触したときの接触面積を高めて、冷感を使用者により知覚させることができるとともに、不織布の構成に起因する柔軟性を発現させることができる。 Since the sanitary non-woven fabric having the above structure uses fibers having polyethylene resin having high thermal conductivity as at least a part of the surface among synthetic resins, when the fibers come into contact with the user's skin, the user The heat caused by the body temperature can be quickly transferred from the user to the sanitary non-woven fabric or to other fibers that are not in contact with the user.
In addition to this, the volume filling rate of the sanitary non-woven fabric is within a predetermined value range, so that the hygienic non-woven fabric contains air having low thermal conductivity while exhibiting a good texture as a fiber sheet. Since the amount can be reduced, the heat generated by the user can be quickly transferred to the sanitary non-woven fabric side.
As a result, when the user's skin comes into contact with the sanitary non-woven fabric, the user can perceive a feeling of coldness and can give a comfortable feeling of use due to the feeling of coldness.
According to a preferred embodiment of the present invention, the user can be made to perceive a feeling of coldness more strongly, which contributes to further improvement of the feeling of use.
Further, since the sanitary non-woven fabric is configured to include the form of fibers, the contact area when the user's skin and the sanitary non-woven fabric come into contact with each other can be increased, and the user can perceive a feeling of coldness. At the same time, the flexibility due to the composition of the non-woven fabric can be exhibited.
　衛生用不織布を構成する繊維は、繊維どうしが互いに接触していることが好ましく、繊維どうしが複数点で接触していることが更に好ましい。これによって、使用者の肌との接触によって生じた熱を多方向に伝達することができるので、使用者の体温に起因する熱を高い効率で移動させることができ、その結果、使用者に対してより効率的に冷感を知覚させることができる。
　本発明における「接触している」とは、繊維間の境界が明瞭な状態で繊維どうしが接触している態様と、繊維どうしが融着している部分を有し、繊維間の境界が不明瞭となっている態様との双方を包含する。
　本発明における「複数点で接触している」とは、不織布を、その構成繊維の延びる方向に直交する方向に切断し、切断面における任意の繊維Ｆを観察したときに、不織布の厚み方向に位置し且つ繊維Ｆと接している上下の繊維が、繊維Ｆと２点以上の点で接していることを意味する。
　繊維どうしが複数点で接触している構成は、例えば後述する横断面形状が楕円形又は多葉形等の非真円形である繊維を用いて、後述する製造工程において、原料の不織布に対して圧縮等による圧密化処理を行うことによって得ることができる。 As for the fibers constituting the sanitary non-woven fabric, the fibers are preferably in contact with each other, and more preferably the fibers are in contact with each other at a plurality of points. As a result, the heat generated by the contact with the user's skin can be transferred in multiple directions, so that the heat caused by the user's body temperature can be transferred with high efficiency, and as a result, to the user. It is possible to perceive a feeling of coldness more efficiently.
The term "contacting" in the present invention means that the fibers are in contact with each other with a clear boundary between the fibers, and that the fibers are fused to each other, and the boundary between the fibers is not present. Includes both aspects that are clear.
In the present invention, "contacting at a plurality of points" means that when a non-woven fabric is cut in a direction orthogonal to the extending direction of its constituent fibers and an arbitrary fiber F on the cut surface is observed, the non-woven fabric is in the thickness direction of the non-woven fabric. It means that the upper and lower fibers located and in contact with the fiber F are in contact with the fiber F at two or more points.
In the configuration in which the fibers are in contact with each other at a plurality of points, for example, a fiber having a non-circular cross-sectional shape such as an elliptical shape or a multi-leaf shape, which will be described later, is used, and the non-woven fabric as a raw material is used in the manufacturing process described later. It can be obtained by performing a consolidation process such as compression.
　衛生用不織布の繊維どうしが接触した状態となっている場合、その接触態様は、融着又は圧着によって構成されていることも好ましい。このような構成となっていることによって、繊維どうしの接触面積を増加させることができ、熱の伝達効率を更に向上させることができる。その結果、使用者へ冷感を効率良く与えることができる。
　融着とは、複数の繊維に熱のみ又は熱及び圧力を付与して、繊維が溶融する等して、繊維間の境界が不明瞭となった態様である。
　圧着とは、複数の繊維に圧力のみを付与して、繊維間の境界が明瞭な状態で繊維どうしが接触している態様であり、繊維間に形成される間隙が存在することは許容される。圧着においては、上述した「複数点で接触している」態様となっていることも好ましい。 When the fibers of the sanitary non-woven fabric are in contact with each other, the contact mode is preferably configured by fusion or pressure bonding. With such a configuration, the contact area between the fibers can be increased, and the heat transfer efficiency can be further improved. As a result, a feeling of coldness can be efficiently given to the user.
Fusing is a mode in which the boundary between fibers becomes unclear because the fibers are melted by applying only heat or heat and pressure to a plurality of fibers.
Crimping is a mode in which only pressure is applied to a plurality of fibers so that the fibers are in contact with each other with a clear boundary between the fibers, and it is permissible that a gap formed between the fibers exists. .. In the crimping, it is also preferable that the above-mentioned "contact at a plurality of points" mode is adopted.
　衛生用不織布を構成する繊維の横断面形状は、例えば、真円形及び楕円形等の円形状、三角形、四角形、五角形及び六角形などの凸多角形又は正多角形状等の幾何学形状が挙げられる。また、これらの幾何学形状に加えて、横断面の外周に沿って凹部及び凸部を複数有する構造が形成された多葉形状となっていてもよい。
　本発明における「横断面形状」とは、衛生用不織布を構成する繊維を、その延びる方向に直交する断面について観察したときの形状をいう。 Examples of the cross-sectional shape of the fibers constituting the sanitary non-woven fabric include circular shapes such as perfect circles and ellipses, and geometric shapes such as convex polygons such as triangles, quadrangles, pentagons and hexagons, and regular polygons. .. Further, in addition to these geometric shapes, a multi-leaf shape may be formed in which a structure having a plurality of concave portions and convex portions is formed along the outer periphery of the cross section.
The "cross-sectional shape" in the present invention refers to a shape when the fibers constituting the sanitary non-woven fabric are observed in a cross section orthogonal to the extending direction thereof.
　これらのうち、繊維の横断面形状は、非真円形状であることが好ましく、楕円形であるか、又は楕円形及び多葉形状を組み合わせたものなどといった、長軸と短軸とを有する形状であることが更に好ましい。このような形状となっていることによって、衛生用不織布の体積充填率を高めやすくすることができるとともに、繊維どうしの接触点の数及び接触面積を増加させて、熱の伝達効率を更に高めることができるので、冷感を使用者に対して一層効果的に知覚させることができる。 Of these, the cross-sectional shape of the fiber is preferably a non-perfect circular shape, and is a shape having a major axis and a minor axis, such as an elliptical shape or a combination of an elliptical shape and a multi-leaf shape. Is more preferable. With such a shape, it is possible to easily increase the volume filling rate of the sanitary non-woven fabric, and increase the number of contact points and contact areas between fibers to further improve the heat transfer efficiency. Therefore, the feeling of coldness can be perceived more effectively by the user.
　繊維の横断面形状が長軸と短軸とを有する形状である場合、その短軸の長さに対する長軸の長さの比（長軸の長さ／短軸の長さ）は、好ましくは１．５以上、より好ましくは２以上、更に好ましくは３以上である。
　また、上述した比は、繊維の製造時における紡糸性を良好にして、生産効率を高める観点から、好ましくは１０以下、より好ましくは８以下、更に好ましくは５以下である。
　また、上述した比は、繊維の全長において満たしていることが好ましい。 When the cross-sectional shape of the fiber has a major axis and a minor axis, the ratio of the length of the major axis to the length of the minor axis (length of the major axis / length of the minor axis) is preferably It is 1.5 or more, more preferably 2 or more, and even more preferably 3 or more.
Further, the above-mentioned ratio is preferably 10 or less, more preferably 8 or less, still more preferably 5 or less, from the viewpoint of improving the spinnability at the time of producing the fiber and increasing the production efficiency.
Moreover, it is preferable that the above-mentioned ratio is satisfied in the total length of the fiber.
　繊維の横断面形状における長軸及び短軸の各長さは、例えば以下の方法で測定することができる。まず、測定対象の不織布を液体窒素で冷却した後、繊維長方向と直交する方向にカッターで切断して、測定サンプルを作製する。測定サンプルの断面を、走査型電子顕微鏡（ＳＥＭ）を用いて、繊維断面が認識でき、且つ繊維断面の寸法が測定可能な程度の任意の倍率で観察する。
　任意の繊維１０本を対象としてそれぞれ独立に断面を観察し、各繊維の走査型電子顕微鏡像から、繊維断面の周縁上の２点を結び、繊維断面の図心を通る最大差し渡し長さの線分を長軸と定め、その長軸に直交する短軸の最大幅を短軸とする（複数の凹凸を外周に有する異形断面形状である場合、凹部に相当する短軸の最小幅は考慮しない）。これらの算術平均値を本発明における長軸の長さ又は短軸の長さとする。
　繊維の横断面形状が多葉形等の複数の凹凸を外周に有する異形断面形状である場合には、任意の繊維１０本を対象として得られた各繊維断面の走査型電子顕微鏡像から、画像処理ソフトウェア等を用いて、繊維断面の周縁に基づく楕円近似処理を行う。当該処理によって得られた楕円の長軸及び短軸の各長さに基づいて算出された算術平均値を、本発明における長軸の長さ又は短軸の長さとする。 The length of each of the major axis and the minor axis in the cross-sectional shape of the fiber can be measured by, for example, the following method. First, the non-woven fabric to be measured is cooled with liquid nitrogen and then cut with a cutter in the direction orthogonal to the fiber length direction to prepare a measurement sample. The cross section of the measurement sample is observed using a scanning electron microscope (SEM) at an arbitrary magnification such that the fiber cross section can be recognized and the size of the fiber cross section can be measured.
Observe the cross section of 10 arbitrary fibers independently, and connect two points on the peripheral edge of the fiber cross section from the scanning electron microscope image of each fiber, and the line of the maximum transfer length passing through the centroid of the fiber cross section. Minutes are defined as the major axis, and the maximum width of the minor axis orthogonal to the major axis is defined as the minor axis. ). Let these arithmetic mean values be the length of the major axis or the length of the minor axis in the present invention.
When the cross-sectional shape of the fiber is a deformed cross-sectional shape having a plurality of irregularities such as a multi-leaf shape on the outer circumference, an image is taken from a scanning electron microscope image of each fiber cross section obtained for 10 arbitrary fibers. Ellipse approximation processing based on the peripheral edge of the fiber cross section is performed using processing software or the like. The arithmetic mean value calculated based on each length of the major axis and the minor axis of the ellipse obtained by the processing is defined as the length of the major axis or the length of the minor axis in the present invention.
　本発明の衛生用不織布は、該不織布の風合いを向上する観点から、その厚みが、好ましくは０．１ｍｍ以上、より好ましくは０．２ｍｍ以上、更に好ましくは０．３ｍｍ以上である。
　また、不織布内の空気の含有量を低減させて、熱伝導性を高める観点から、好ましくは３ｍｍ以下、より好ましくは１．５ｍｍ以下、更に好ましくは０．５ｍｍ以下である。
　上述した衛生用不織布の厚みは、４．９ｍＮ／ｃｍ２（０．５ｇｆ／ｃｍ２）荷重下において、レーザー変位計等を用いて測定したものとする。
　衛生用不織布の厚みが上述した構成となっていることによって、衛生用不織布の熱容量を高めて、使用者に冷感を効率よく知覚させることができる衛生用不織布を効率よく製造することができる。 From the viewpoint of improving the texture of the non-woven fabric of the present invention, the thickness of the non-woven fabric for hygiene is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more.
Further, from the viewpoint of reducing the air content in the non-woven fabric and increasing the thermal conductivity, it is preferably 3 mm or less, more preferably 1.5 mm or less, still more preferably 0.5 mm or less.
The thickness of the above-mentioned sanitary nonwoven fabric shall be measured using a laser displacement meter or the like under a load of 4.9 mN / cm 2 (0.5 gf / cm 2).
Since the thickness of the sanitary nonwoven fabric is configured as described above, it is possible to efficiently manufacture the sanitary nonwoven fabric that can increase the heat capacity of the sanitary nonwoven fabric and allow the user to efficiently perceive a feeling of coldness.
　また、本発明の衛生用不織布は、その坪量が、好ましくは１５ｇ／ｍ２以上、より好ましくは２０ｇ／ｍ２以上、更に好ましくは２５ｇ／ｍ２以上である。
　また、本発明の衛生用不織布は、その坪量が、好ましくは１４０ｇ／ｍ２以下、より好ましくは９０ｇ／ｍ２以下、更に好ましくは５０ｇ／ｍ２以下である。
　上述した構成になっていることによって、衛生用不織布の坪量ムラに起因する冷感の知覚の違いを低減させることができるとともに、繊維どうしの融着や圧密化を効果的に行うことができ、所定の体積充填率を有する衛生用不織布を生産性高く製造することができる。 Further, the sanitary nonwoven fabric of the present invention has a basis weight of preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, and further preferably 25 g / m 2 or more.
The non-woven fabric for hygiene of the present invention has a basis weight of preferably 140 g / m 2 or less, more preferably 90 g / m 2 or less, and further preferably 50 g / m 2 or less.
With the above-described configuration, it is possible to reduce the difference in the perception of coldness caused by the uneven basis weight of the sanitary non-woven fabric, and it is possible to effectively fuse and compact the fibers. , A sanitary nonwoven fabric having a predetermined volume filling rate can be produced with high productivity.
　本発明の衛生用不織布は、その接触冷感ｑｍａｘが、好ましくは０．０６Ｗ／ｍ２以上、より好ましくは０．０８Ｗ／ｍ２以上、更に好ましくは０．１０Ｗ／ｍ２以上であり、好ましくは０．８０Ｗ／ｍ２以下、より好ましくは０．６０Ｗ／ｍ２以下、更に好ましくは０．５０Ｗ／ｍ２以下である。
　具体的には、衛生用不織布の接触冷感ｑｍａｘは、好ましくは０．０６Ｗ/ｍ２以上０．８０Ｗ／ｍ２以下、より好ましくは０．０８Ｗ／ｍ２以上０．６０Ｗ／ｍ２以下、更に好ましくは０．１０Ｗ／ｍ２以上０．５０Ｗ／ｍ２以下である。 Sanitary non-woven fabric of the present invention, the contact sensation q max is preferably 0.06 W / m 2 or more, more preferably 0.08 W / m 2 or more, further preferably 0.10 W / m 2 or more, preferably 0.80 W / m 2 or less, more preferably 0.60 W / m 2, more preferably not more than 0.50 W / m 2.
Specifically, contact sensation q max of hygiene nonwovens, preferably 0.06 W / m 2 or more 0.80 W / m 2 or less, more preferably 0.08 W / m 2 or more 0.60 W / m 2 or less , further preferably 0.10 W / m 2 or more 0.50 W / m 2 or less.
　接触冷感ｑｍａｘは、例えば以下の方法で測定することができる。
　まず、測定対象の衛生用不織布から、長さ１０ｃｍ×幅１０ｃｍの寸法となるように試験片を切り出し、該試験片を室温２３℃、相対湿度５０％の環境下に２４時間放置する。
　次いで、この環境下で、試験片を測定台に載せ、両面テープを用いて測定台に試験片を固定する。測定台としては、気体や液体を熱媒体として用いた恒温装置を用いる。
　続いて、測定装置（カトーテック株式会社製、ＫＥＳ－Ｆ７　サーモラボＩＩ）及び該装置の測定マニュアルに従って、測定対象の接触冷感ｑｍａｘを測定する。
　具体的には、測定対象と接触させる熱板として、面積９．０ｃｍ２、質量９．８ｇの純銅板を用い、該銅板の初期温度を３３℃（測定対象の表面温度より１０℃高い温度）、該銅板の測定対象への接触圧を１ｋＰａとして、試験片に該銅板を接触させ、その接触の瞬間の前記熱流量の値をゼロとして、該熱流量の最大値を測定する。
　この測定を測定対象面につき５回行い、それら複数の測定値の算術平均値を、測定対象の接触冷感ｑｍａｘ（Ｗ／ｍ２）とする。 The cool contact feeling q max can be measured by, for example, the following method.
First, a test piece is cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece is left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours.
Next, in this environment, the test piece is placed on the measuring table, and the test piece is fixed to the measuring table using double-sided tape. As the measuring table, a constant temperature device using a gas or liquid as a heat medium is used.
Subsequently, the cool contact feeling q max of the measurement target is measured according to the measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.) and the measurement manual of the device.
Specifically, a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target). The contact pressure of the copper plate to the measurement target is set to 1 kPa, the copper plate is brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact is set to zero, and the maximum value of the heat flow rate is measured.
This measurement is performed 5 times for the surface to be measured, and the arithmetic mean value of the plurality of measured values is defined as the cool contact feeling q max (W / m 2 ) of the measurement target.
　接触冷感とは、肌が物体に触れたときに冷たく感じる皮膚感覚を数値化したものである。この接触冷感は、肌が物体に触れたときの、肌から物体への熱の移動量によって異なり、熱の移動量が多いほど、触れたときに冷たく感じる。接触冷感ｑｍａｘは、この肌から物体への熱の移動量の最大値に対応するものであり、接触冷感ｑｍａｘの値は、物体に触れたときに冷たく感じる場合ほど大きく、温かく感じる場合ほど小さくなる。したがって、接触冷感ｑｍａｘの値が上述の範囲であることによって、冷感をより効果的に知覚させることができる。 The cool contact sensation is a numerical value of the sensation of the skin that feels cold when the skin touches an object. This cool contact feeling depends on the amount of heat transferred from the skin to the object when the skin touches the object, and the larger the amount of heat transferred, the colder the feeling when touched. The cool contact feeling q max corresponds to the maximum value of the amount of heat transferred from the skin to the object, and the value of the cool contact feeling q max is larger and feels warmer when the object is touched. The smaller the case. Therefore, when the value of the contact cooling sensation q max is in the above range, the cooling sensation can be perceived more effectively.
　本発明の衛生用不織布は２つの面を有するシート状物であるところ、衛生用不織布の表面における構成繊維の存在割合（以下、これを「繊維表面存在率」ともいう。）が所定の値以上であることが好ましい。なお、衛生用不織布の表面とは、衛生用不織布の最外面から厚み方向に２０μｍまでの領域のことである。衛生用不織布の最外面とは、衛生用不織布を厚み方向に沿って切断し、その厚み方向に沿う断面を、走査型電子顕微鏡（ＳＥＭ）を用いて観察した場合に、その画像において、厚み方向の最外方に位置する部位によって形成される、衛生用不織布の厚み方向と直交する面のことである。
　詳細には、衛生用不織布の繊維表面存在率が、好ましくは４０％以上、より好ましくは４５％以上、更に好ましくは５０％以上であり、好ましくは９０％以下、より好ましくは８５％以下、更に好ましくは８０％以下である。
　より詳細には、衛生用不織布の繊維表面存在率が、好ましくは４０％以上９０％以下、より好ましくは４５％以上８５％以下、更に好ましくは５０％以上８０％以下である。
　繊維表面存在率は、不織布の表面において、その構成繊維と、該繊維どうしの間の空隙との関係を繊維の存在割合に着目して表したものである。したがって、繊維表面存在率が上述した範囲であることによって、繊維内の空気の含有率を低下させることができ、より高い冷感が得られる。 The sanitary nonwoven fabric of the present invention is a sheet-like material having two surfaces, and the abundance ratio of constituent fibers on the surface of the sanitary nonwoven fabric (hereinafter, this is also referred to as "fiber surface abundance ratio") is equal to or higher than a predetermined value. Is preferable. The surface of the sanitary non-woven fabric is a region from the outermost surface of the sanitary non-woven fabric to 20 μm in the thickness direction. The outermost surface of the sanitary non-woven fabric is the thickness direction in the image when the sanitary non-woven fabric is cut along the thickness direction and the cross section along the thickness direction is observed using a scanning electron microscope (SEM). It is a surface formed by the outermost part of the non-woven fabric for sanitary use, which is orthogonal to the thickness direction of the non-woven fabric.
Specifically, the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more, more preferably 45% or more, still more preferably 50% or more, preferably 90% or less, more preferably 85% or less, and further. It is preferably 80% or less.
More specifically, the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more and 90% or less, more preferably 45% or more and 85% or less, and further preferably 50% or more and 80% or less.
The fiber surface abundance ratio is a representation of the relationship between the constituent fibers and the voids between the fibers on the surface of the non-woven fabric, focusing on the abundance ratio of the fibers. Therefore, when the fiber surface abundance rate is in the above range, the air content in the fiber can be reduced, and a higher cooling sensation can be obtained.
　繊維表面存在率は、例えば、以下の方法に基づいて、面積基準の割合として測定することができる。
　詳細には、測定対象の衛生用不織布から無作為に４ｃｍ×４ｃｍの大きさの切片をサンプルとして２箇所切り取る。得られたサンプルの一方の面を、走査型電子顕微鏡（ＳＥＭ）を用いて、電圧１５ｋＶ、倍率５０倍で測定し、ＳＥＭ画像を得る。次いで、画像処理ソフトウェアＷｉｎＲＯＯＦ２０１８（三谷商事株式会社製）を用いて、ＳＥＭ画像をしきい値１２１～２５５の値で二値化し、画像全域の面積に対する二値化したうちの明色（白色）の部位における面積の割合を、上記ソフトウェアに内蔵の面積計算機能を用いて測定及び算出し、この面積割合を本発明の繊維表面存在率とする。
　上述の方法で測定困難である場合、しきい値の値を７０～２５５の値で二値化して、明色部分の面積率を測定する。 The fiber surface abundance can be measured as an area-based ratio, for example, based on the following method.
Specifically, two sections having a size of 4 cm × 4 cm are randomly cut from the sanitary non-woven fabric to be measured. One surface of the obtained sample is measured using a scanning electron microscope (SEM) at a voltage of 15 kV and a magnification of 50 times to obtain an SEM image. Next, using the image processing software WinROOF2018 (manufactured by Mitani Shoji Co., Ltd.), the SEM image was binarized at a threshold value of 121 to 255, and the light color (white) of the binarized area with respect to the entire area of the image. The area ratio at the site is measured and calculated using the area calculation function built into the software, and this area ratio is used as the fiber surface abundance rate of the present invention.
When it is difficult to measure by the above method, the threshold value is binarized to a value of 70 to 255, and the area ratio of the light-colored portion is measured.
　本発明の衛生用不織布は、該不織布を構成する繊維が一定の配向性を持って配置されていることが好ましい。
　このような構成となっていることによって、熱の移動が繊維長さ方向に沿って起こりやすくなり、使用者へ冷感を知覚させやすくすることができる。 In the sanitary nonwoven fabric of the present invention, it is preferable that the fibers constituting the nonwoven fabric are arranged with a certain orientation.
With such a configuration, heat transfer is likely to occur along the fiber length direction, and it is possible to make the user perceive a feeling of coldness.
　より具体的には、本発明の衛生用不織布は、該不織布を水平面に静置したときに、該不織布の繊維の繊維長さ方向が該水平面に概ね平行にあることが好ましい。
　また、これに加えて、又はこれに代えて、衛生用不織布を平面視したときに、繊維の延在方向が一方向であることが好ましい。例えば、衛生用不織布の平面視において、衛生用不織布の第１方向と、第１方向に直交する第２方向を考えたときに、繊維の延在方向が、不織布の第１方向又は第２方向と一致していることが更に好ましい。繊維どうしが交点を有する場合、衛生用不織布の平面視において、交点のある繊維どうしのなす角度が鈍角であるものが５０％以上存在することが望ましい。鈍角とは９０°よりも大きい角度を指す。 More specifically, in the sanitary non-woven fabric of the present invention, it is preferable that the fiber length direction of the fibers of the non-woven fabric is substantially parallel to the horizontal plane when the non-woven fabric is allowed to stand on the horizontal plane.
Further, in addition to or instead of this, when the sanitary non-woven fabric is viewed in a plan view, it is preferable that the extending direction of the fibers is one direction. For example, in the plan view of the sanitary non-woven fabric, when the first direction of the sanitary non-woven fabric and the second direction orthogonal to the first direction are considered, the extending direction of the fibers is the first direction or the second direction of the non-woven fabric. It is more preferable that it matches with. When the fibers have intersections, it is desirable that 50% or more of the fibers having the intersections have an obtuse angle in the plan view of the sanitary non-woven fabric. An obtuse angle refers to an angle larger than 90 °.
　繊維どうしのなす角度の定量は、衛生用不織布の任意の３箇所について、繊維の交点が１０箇所程度視野内に確認できる倍率でＳＥＭにて撮影し、得られた画像データをＳＥＭに付属の又は任意の画像解析ソフトウェア等で測定及び集計することが可能である。また、画像解析ソフトウェアを保有していない場合は、得られた画像データを印刷して、繊維どうしの角度を分度器などの角度測定器で確認し、データシートに書き込む等して集計することが可能である。
　上述した繊維の配向性に関する構成を少なくとも一つ有することによって、熱の移動が一定方向へ進みやすくなり、使用者へ冷感をより効果的に知覚させやすくすることができる。
　このような構成は、例えば、材料としてＨＤＰＥの短繊維を用いて長尺シートを製造し、該長尺シートを搬送方向に張力をかけながら搬送し、エアスルー法によって繊維どうしを融着させるか、又はベルトコンベア等の搬送設備に対してＨＤＰＥ繊維を紡出しながら該繊維を一方向に搬送したりする方法で製造することにより得ることができる。 To quantify the angle between the fibers, take an image with SEM at any 3 points of the sanitary non-woven fabric at a magnification that allows about 10 fiber intersections to be confirmed in the field of view, and the obtained image data is attached to the SEM or It is possible to measure and tabulate with any image analysis software or the like. If you do not have image analysis software, you can print the obtained image data, check the angle between the fibers with an angle measuring device such as a protractor, and write it in a data sheet to total the data. Is.
By having at least one configuration related to the orientation of the fibers described above, the heat transfer can easily proceed in a certain direction, and the user can more effectively perceive the feeling of coldness.
In such a configuration, for example, a long sheet is manufactured using HDPE short fibers as a material, the long sheet is conveyed while applying tension in the conveying direction, and the fibers are fused by an air-through method. Alternatively, it can be obtained by manufacturing by a method of transporting the HDPE fiber in one direction while spinning the HDPE fiber to a transport facility such as a belt conveyor.
　上述の説明では、説明の便宜上、衛生用不織布は、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含有する単一の繊維層を有する態様（単一繊維のみからなるか、他の繊維との混綿であるかは問わない）を例にとり説明したが、この形態に限られない。詳細には、衛生用不織布は、２層以上の複数の繊維層を有していてもよい。 In the above description, for convenience of explanation, the sanitary nonwoven fabric has an embodiment in which it has a single fiber layer containing fibers in which at least a part of the surface is made of polyethylene resin (consisting of only a single fiber or with other fibers). (It does not matter whether it is a mixed cotton or not) has been explained as an example, but the present invention is not limited to this form. Specifically, the sanitary nonwoven fabric may have a plurality of fiber layers of two or more layers.
　衛生用不織布の一実施形態として、例えば、表面の少なくとも一部がポリエチレン樹脂からなる第１繊維を含む繊維層（以下、これを第１繊維層ともいう）と、該繊維層に隣接して配された第１繊維以外の繊維を含む第２繊維の層（以下、これを第２繊維層ともいう。）とを少なくとも備える。ここで隣接とは、繊維層どうしが他の繊維層を介さずに隣り合っていることを意味し、繊維層間に接着剤が介在していることは許容される。
　この場合、冷感の効果的な知覚の観点から、第１繊維層は、衛生用不織布の外面を構成することが好ましい。また同様の観点から、少なくとも第１繊維層は上述した衛生用不織布に係る各種の好ましい形態を満たすことが好ましく、衛生用不織布全体において上述の好適な形態を満たすことがより好ましい。 As one embodiment of the sanitary nonwoven fabric, for example, a fiber layer containing a first fiber whose surface is at least partially made of polyethylene resin (hereinafter, also referred to as a first fiber layer) and an arrangement adjacent to the fiber layer. It includes at least a layer of a second fiber containing fibers other than the first fiber (hereinafter, this is also referred to as a second fiber layer). Here, "adjacent" means that the fiber layers are adjacent to each other without interposing other fiber layers, and it is permissible that an adhesive is interposed between the fiber layers.
In this case, from the viewpoint of effective perception of cooling sensation, it is preferable that the first fiber layer constitutes the outer surface of the sanitary non-woven fabric. From the same viewpoint, it is preferable that at least the first fiber layer satisfies various preferable forms of the above-mentioned sanitary nonwoven fabric, and it is more preferable that the entire sanitary nonwoven fabric satisfies the above-mentioned preferable forms.
　詳細には、複層構造の衛生用不織布は、例えば、表面の少なくとも一部がポリエチレン樹脂からなる第１繊維を含む繊維ウェブと、第１繊維以外の繊維を含む第２繊維ウェブとを積層した状態で、エアスルー加工あるいはスパンボンド加工を施すことによって得ることができる。この場合、各繊維層の境界は不明瞭であることが一般的であるが、該境界が明瞭である部分を含んでいてもよい。本形態の場合、各繊維層は、例えば絡合、融着及び圧着の少なくとも一つによって、繊維シートの形態を維持している。
　複層構造の衛生用不織布の別の実施形態としては、表面の少なくとも一部がポリエチレン樹脂からなる第１繊維を含む繊維ウェブまたは繊維シートと、第１繊維以外の繊維を含む繊維ウェブまたは繊維シートとを接着剤によって接着して接合することで、繊維シートの形態が維持された態様が挙げられる。この場合、各繊維層の境界は明瞭であることが一般的である。 Specifically, the multi-layered sanitary nonwoven fabric is obtained by laminating, for example, a fiber web containing a first fiber whose surface is at least partially made of polyethylene resin and a second fiber web containing fibers other than the first fiber. It can be obtained by performing air-through processing or spunbond processing in the state. In this case, the boundary of each fiber layer is generally unclear, but it may include a portion where the boundary is clear. In the case of this embodiment, each fiber layer maintains the shape of the fiber sheet by, for example, at least one of entanglement, fusion and pressure bonding.
Another embodiment of the multi-layered sanitary non-woven fabric is a fiber web or fiber sheet containing first fibers in which at least a part of the surface is made of polyethylene resin, and a fiber web or fiber sheet containing fibers other than the first fibers. An embodiment in which the form of the fiber sheet is maintained by adhering and joining with an adhesive can be mentioned. In this case, the boundaries of each fiber layer are generally clear.
　いずれの態様であっても、第１繊維以外の繊維としては、ＰＥＴ樹脂やＰＰ樹脂等の上述した構成樹脂を含む繊維の他に、パルプ繊維やレーヨン繊維、その他の親水化処理済み繊維等の一種以上が挙げられる。
　第２繊維層の坪量は、好ましくは１５ｇ／ｍ２以上、より好ましくは２０ｇ／ｍ２以上、更に好ましくは２５ｇ／ｍ２以上、また好ましくは１４０ｇ／ｍ２以下、より好ましくは９０ｇ／ｍ２以下、更に好ましくは７０ｇ／ｍ２以下である。 In any aspect, the fibers other than the first fiber include fibers containing the above-mentioned constituent resins such as PET resin and PP resin, pulp fibers, rayon fibers, and other hydrophilized fibers. One or more can be mentioned.
The basis weight of the second fiber layer is preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, further preferably 25 g / m 2 or more, and preferably 140 g / m 2 or less, more preferably 90 g / m. It is 2 or less, more preferably 70 g / m 2 or less.
　上述した衛生用不織布は、これをこのままで用いてもよく、あるいは、衛生品の構成部材として該衛生用不織布を用い、該衛生用不織布を備える衛生品としてもよい。
　また、本発明の衛生用不織布を衛生品に組み込む場合には、該不織布が使用者の肌に対向する面を構成することが好ましい。
　いずれの場合にも、それらは典型的には使い捨てである。 The above-mentioned sanitary non-woven fabric may be used as it is, or the sanitary non-woven fabric may be used as a constituent member of the sanitary product and may be a sanitary product provided with the sanitary non-woven fabric.
Further, when the sanitary nonwoven fabric of the present invention is incorporated into a sanitary product, it is preferable that the nonwoven fabric constitutes a surface facing the skin of the user.
In either case, they are typically disposable.
　本発明の衛生用不織布を備える衛生品は、例えば吸収性物品等である。つまり、衛生用不織布は、吸収性物品等の構成部材として用いることができる。
　典型的には、吸収性物品は、表面シートと、裏面シートとを備え、表面シートと裏面シートとの間に配された吸収体を備えており、これに加えて、又は表面シート若しくは裏面シートに代えて、衛生用不織布を配した状態で用いることができる。吸収性物品としては、例えば使い捨ておむつ、尿漏れパッド、生理用ナプキン、パンティライナー等が包含されるが、これらに限定されるものではなく、人体から排出される液の吸収に用いられる物品を広く包含する。 The hygienic product provided with the non-woven fabric for hygiene of the present invention is, for example, an absorbent article. That is, the sanitary non-woven fabric can be used as a constituent member of an absorbent article or the like.
Typically, the absorbent article comprises a front surface sheet, a back surface sheet, and an absorber disposed between the front surface sheet and the back surface sheet, and in addition to this, or a front surface sheet or a back surface sheet. Instead of, it can be used in a state where a sanitary non-woven fabric is arranged. Absorbent articles include, for example, disposable diapers, incontinence pads, sanitary napkins, panty liners, etc., but are not limited thereto, and articles used for absorbing liquid discharged from the human body are widely used. Include.
　衛生用不織布を吸収性物品等の構成部材として用いる場合、衛生用不織布は、吸収性物品等の衛生品の使用時、あるいは吸収性物品等の衛生品を包装から取り出す等の取扱い時において、使用者の肌に直接接触する部位に配することができる。つまり、衛生用不織布は、吸収性物品等の衛生品の外面に配されていることが好ましい。
　吸収性物品等の衛生品の外面とは、パッケージを開封して吸収性物品等の衛生品を取り出した後に、使用者が手に触れることができる吸収性物品等の衛生品の面（表裏を含有しているが、厚み方向に進んだ、内部の面ではなく、表面側）を意味する。
　つまり、衛生品を構成する衛生用不織布は、衛生品を着用する着用者の肌に対向する面に配されていてもよく、衛生品を着用する着用者の肌に対向しない面に配されていてもよく、衛生品の包装体を構成してもよい。 When a sanitary non-woven fabric is used as a constituent member of an absorbent article, etc., the sanitary non-woven fabric is used when using a sanitary product such as an absorbent article, or when handling a sanitary product such as an absorbent article from the packaging. It can be placed on the part that comes into direct contact with the person's skin. That is, the sanitary non-woven fabric is preferably arranged on the outer surface of a sanitary product such as an absorbent article.
The outer surface of hygiene products such as absorbent articles is the surface of hygienic products such as absorbent articles that the user can touch after opening the package and taking out the hygienic products such as absorbent articles. It is contained, but it means the surface side, not the inner surface, which is advanced in the thickness direction.
That is, the hygienic non-woven fabric constituting the hygiene product may be arranged on the surface facing the skin of the wearer wearing the hygiene product, or may be arranged on the surface not facing the skin of the wearer wearing the hygiene product. Alternatively, a sanitary product package may be constructed.
　詳細には、衛生品の一実施形態である吸収性物品として、例えば使い捨ておむつに衛生用不織布を用いる場合、例えば表面シート、サイド不織布、腰回りギャザーや鼠径部近傍に配されるギャザー、並びに外装体等の構成部材として用いることができる。
　また、衛生品の一実施形態である吸収性物品として、尿漏れパッド及び生理用ナプキンに衛生用不織布を用いる場合、例えば表面シートや、サイド不織布、ヒップガード、あるいは個包装用の袋等の構成部材として用いることができる。
　また、衛生品の一実施形態である吸収性物品として、尿漏れパッド及び生理用ナプキンに衛生用不織布を用いる場合、例えば表面シートや鼠径部近傍に配されるギャザー等の構成部材として用いることができる。 Specifically, as an absorbent article which is an embodiment of a sanitary product, for example, when a sanitary non-woven fabric is used for a disposable diaper, for example, a surface sheet, a side non-woven fabric, gathers around the waist and gathers arranged in the vicinity of the inguinal region, and an exterior. It can be used as a constituent member of a body or the like.
Further, when a sanitary non-woven fabric is used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a hygienic product, for example, a surface sheet, a side non-woven fabric, a hip guard, a bag for individual wrapping, or the like is configured. It can be used as a member.
Further, when a sanitary non-woven fabric is used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a sanitary product, it may be used as a constituent member such as a surface sheet or gathers arranged in the vicinity of the inguinal region. can.
　特に、吸収性物品等の衛生品の使用時において、冷感を知覚させて、蒸れ等による不快感を低減させる観点から、衛生用不織布は、吸収性物品の衛生品を適正な位置で着用した場合において、吸収性物品の衛生品を着用する着用者の肌に対向する面（以下、これを「肌対向面」ともいう。）側を構成するように配されていることが好ましい。 In particular, when using sanitary products such as absorbent articles, the sanitary non-woven fabric is worn at an appropriate position from the viewpoint of perceiving a feeling of coldness and reducing discomfort due to stuffiness and the like. In some cases, it is preferable that the fabric is arranged so as to form a surface facing the skin of the wearer who wears the hygienic product of the absorbent article (hereinafter, this is also referred to as a “skin facing surface”).
　また、衛生用不織布は、吸収性物品の衛生品と着用者との肌とが着用時において直接当接する部位に配されることも好ましい。
　このような吸収性物品の構成部材としては、例えば表面シート、サイド不織布、腰回りギャザーや鼠径部近傍に配されるギャザー等が挙げられる。 Further, it is also preferable that the hygienic non-woven fabric is arranged at a portion where the hygienic product of the absorbent article and the skin of the wearer come into direct contact with each other when worn.
Examples of the constituent members of such an absorbent article include a surface sheet, a side non-woven fabric, waist gathers, gathers arranged in the vicinity of the inguinal region, and the like.
　吸収性物品に用いられる表面シートは、肌対向面側を構成するシートであり、裏面シートは、吸収性物品を着用する着用者の肌とは反対側に向けられる面（以下、これを「非肌対向面」ともいう。）側を構成するシートである。吸収性物品に用いられる表面シート及び裏面シートは、本発明の衛生用不織布以外のものを用いる場合、吸収性物品に従来用いられているものを特に制限なく用いることができる。表面シートとしては、例えば液透過性の各種の不織布や開孔フィルム等を用いることができる。裏面シートとしては、液難透過性若しくは撥水性又は液透過性のシートを用いることができる。前者としては樹脂フィルムや、樹脂フィルムと不織布等とのラミネート等が挙げられる。後者は表面シートと同じものを用いることができる。 The front surface sheet used for the absorbent article is a sheet constituting the skin facing surface side, and the back surface sheet is a surface facing the side opposite to the skin of the wearer who wears the absorbent article (hereinafter, this is referred to as "non-skin"). It is a sheet that constitutes the side facing the skin. When a non-woven fabric for sanitary use of the present invention is used as the front surface sheet and the back surface sheet used for the absorbent article, those conventionally used for the absorbent article can be used without particular limitation. As the surface sheet, for example, various liquid-permeable non-woven fabrics, perforated films, and the like can be used. As the back surface sheet, a liquid impervious or water repellent or liquid permeable sheet can be used. Examples of the former include a resin film and a laminate of a resin film and a non-woven fabric or the like. The latter can be the same as the surface sheet.
　吸収性物品に用いられる吸収体は、吸収性コアを備えている。吸収性コアは例えばパルプをはじめとするセルロース等の親水性繊維の積繊体、該親水性繊維と吸水性ポリマーとの混合積繊体、吸水性ポリマーの堆積体などから構成され、典型的には親水性繊維と吸水性ポリマーとを含む。
　吸収性コアは、コアラップシートで覆われていてもよい。コアラップシートの被覆態様としては、例えば、少なくともその肌対向面が液透過性のコアラップシートで覆われていてもよく、肌対向面及び非肌対向面を含む表面の全域がコアラップシートで覆われていてもよい。コアラップシートとしては、例えば親水性繊維からなる薄葉紙や、液透過性を有する不織布などを用いることができる。 The absorber used in the absorbent article comprises an absorbent core. The absorbent core is composed of, for example, a laminated fiber of hydrophilic fibers such as cellulose such as pulp, a mixed fiber of the hydrophilic fiber and a water-absorbent polymer, a deposit of a water-absorbent polymer, and the like, and is typically composed of. Includes hydrophilic fibers and water-absorbing polymers.
The absorbent core may be covered with a core wrap sheet. As a coating mode of the core wrap sheet, for example, at least the skin facing surface thereof may be covered with a liquid-permeable core wrap sheet, and the entire surface including the skin facing surface and the non-skin facing surface is covered with the core wrap sheet. It may be covered. As the core wrap sheet, for example, thin paper made of hydrophilic fibers, a non-woven fabric having liquid permeability, or the like can be used.
　衛生用不織布に用いられる繊維の繊維径は、構成繊維が肌にまとわりつかず、使用者の触感を良好に保つ観点から、好ましくは３μｍ以上、更に好ましくは５μｍ以上である。
　また、不織布における繊維間隙を小さくし、不織布中の空気の含有量を低減して、熱伝導性を高める観点から、好ましくは７０μｍ以下、更に好ましくは５０μｍ以下である。
　繊維の繊維径は、繊維の横断面形状における長軸及び短軸の各長さにおける測定方法と同様に、測定サンプルの作製及びＳＥＭ観察を行い、１サンプルあたり１０本の繊維の繊維径を測定して、その算術平均値を本発明の繊維径とする。繊維が非真円形である場合には、繊維の長軸及び短軸の各長さを上述の方法で測定し、繊維一本での長軸長さと短軸長さとの算術平均値を繊維径とし、該繊維径の１０本の算術平均値を、本発明における繊維の繊維径とする。 The fiber diameter of the fibers used in the sanitary non-woven fabric is preferably 3 μm or more, more preferably 5 μm or more, from the viewpoint that the constituent fibers do not cling to the skin and the user's tactile sensation is kept good.
Further, from the viewpoint of reducing the fiber gaps in the non-woven fabric, reducing the air content in the non-woven fabric, and increasing the thermal conductivity, it is preferably 70 μm or less, more preferably 50 μm or less.
The fiber diameter of the fiber is measured by preparing a measurement sample and observing SEM in the same manner as the measurement method for each length of the major axis and the minor axis in the cross-sectional shape of the fiber, and measuring the fiber diameter of 10 fibers per sample. Then, the arithmetic average value is used as the fiber diameter of the present invention. When the fiber is non-circular, the length of each of the major axis and the minor axis of the fiber is measured by the above method, and the arithmetic average value of the major axis length and the minor axis length of one fiber is calculated as the fiber diameter. Then, the arithmetic average value of 10 fibers of the fiber diameter is defined as the fiber diameter of the fiber in the present invention.
　本発明の効果が奏される限りにおいて、本発明の衛生用不織布は、熱伝導率を高めるためのフィラーを更に含んでいてもよい。このようなフィラーとしては、例えば酸化チタン、アルミナ、窒化ホウ素、酸化マグネシウム、シリカ、カーボンブラック、及びカーボンナノチューブ等の少なくとも一種が挙げられる。フィラーは、繊維内に存在していてもよく、繊維どうしの間に存在していてもよく、繊維表面に一部露出し且つ繊維内部に繊維に埋め込まれて存在していてもよい。 As long as the effects of the present invention are exhibited, the sanitary nonwoven fabric of the present invention may further contain a filler for increasing the thermal conductivity. Examples of such a filler include at least one such as titanium oxide, alumina, boron nitride, magnesium oxide, silica, carbon black, and carbon nanotubes. The filler may be present in the fiber, may be present between the fibers, may be partially exposed on the fiber surface, and may be embedded in the fiber inside the fiber.
　本発明の衛生用不織布を用いて衛生品とする場合、該衛生品は、表面の少なくとも一部がポリエチレン樹脂からなる繊維の集合体である衛生用不織布（以下、これを説明の便宜上「第１繊維集合体」ともいう。）に加えて、更に別の部材（以下、この部材を「第２部材」ともいう。）を備えていてもよい。 When the sanitary non-woven fabric of the present invention is used as a sanitary product, the sanitary product is a sanitary non-woven fabric in which at least a part of the surface is an aggregate of fibers made of polyethylene resin (hereinafter, this is referred to as "first" for convenience of explanation. In addition to the "fiber aggregate"), another member (hereinafter, this member may also be referred to as a "second member") may be provided.
　第２部材が配された衛生品の実施形態としては、例えば、第２部材として、吸収性ポリマー及び繊維を含有する吸収性シート、並びに吸収性ポリマー及び繊維を含有する吸収体等の少なくとも一種を用いることができる。これらは衛生用不織布とは異なる繊維集合体の一例である。これらの第２部材を備える衛生品としては、上述の吸収性物品が好ましく挙げられる。
　つまり、本実施形態においては、衛生品の構成材料として、第１繊維集合体である衛生用不織布と、第２部材である吸収性シート及び／又は吸収体とが配されているものである。第１繊維集合体及び第２部材は、互いに隣接して配されていることも好ましい。本実施形態における各繊維集合体は、互いに接合されていてもよく、接合されていなくてもよい。
　吸収性シートとしては、例えば特開平８－２４６３９５号公報に記載の吸収性シートなどを用いることができる。 As an embodiment of a hygienic product to which the second member is arranged, for example, as the second member, at least one of an absorbent sheet containing an absorbent polymer and a fiber, an absorbent body containing an absorbent polymer and a fiber, and the like are used. Can be used. These are examples of fiber aggregates different from sanitary non-woven fabrics. As the hygienic product provided with these second members, the above-mentioned absorbent article is preferably mentioned.
That is, in the present embodiment, the sanitary non-woven fabric, which is the first fiber aggregate, and the absorbent sheet and / or the absorbent body, which are the second members, are arranged as the constituent materials of the sanitary product. It is also preferable that the first fiber assembly and the second member are arranged adjacent to each other. The fiber aggregates in this embodiment may or may not be joined to each other.
As the absorbent sheet, for example, the absorbent sheet described in JP-A-8-246395 can be used.
　衛生品が上述した第２部材を備える場合、又は衛生用不織布が上述した第２繊維層を含む場合において、第２部材又は第２繊維層はその厚み変化が所定の値以上のものを用いることが好ましい。
　詳細には、第２部材の９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重下での圧縮変形量が、好ましくは０．３ｍｍ以上、より好ましくは０．５ｍｍ以上である。また、同荷重下での第２部材の圧縮変形量が、好ましくは３ｍｍ以下である。圧縮変化量は、後述するように、無荷重下での第２部材の厚みから、９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重下での第２部材の厚みを差し引いた変化量として表される。
　衛生用不織布を構成する第２繊維層においても同様の圧縮変形量を有することが好ましい。これに加えて、衛生品が複層構造の衛生用不織布及び第２部材の双方を備える場合、第２部材及び第２繊維層の双方が上述した圧縮変形量をそれぞれ満たすことが好ましい。
　このような構成となっていることによって、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含む第１繊維集合体が着用者に触れたときに、第１繊維集合体が第２部材の変形に追従して容易に変形して、着用者への接触面積を高めて、冷感を着用者に効率的に知覚させることができる。 When the sanitary product includes the above-mentioned second member, or when the sanitary nonwoven fabric contains the above-mentioned second fiber layer, the second member or the second fiber layer whose thickness change is equal to or more than a predetermined value shall be used. Is preferable.
Specifically, the amount of compressive deformation of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.5 mm or more. Further, the amount of compressive deformation of the second member under the same load is preferably 3 mm or less. As will be described later, the amount of change in compression is expressed as the amount of change obtained by subtracting the thickness of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2) from the thickness of the second member under no load. Will be done.
It is preferable that the second fiber layer constituting the sanitary non-woven fabric has the same amount of compressive deformation. In addition to this, when the sanitary product includes both the sanitary non-woven fabric having a multi-layer structure and the second member, it is preferable that both the second member and the second fiber layer satisfy the above-mentioned compression deformation amount, respectively.
With such a configuration, when the first fiber aggregate containing fibers whose surface is at least partly made of polyethylene resin touches the wearer, the first fiber aggregate undergoes deformation of the second member. It can be easily deformed to follow and increase the contact area with the wearer so that the wearer can efficiently perceive the feeling of coldness.
　上述した物性を有する第２繊維層は、例えば、後述する製造方法において、構成繊維としてＰＥＴ樹脂やＰＰ樹脂からなる繊維や、あるいはＰＥＴ／ＨＤＰＥ芯鞘複合繊維などを用い、エアスルー処理を施した繊維ウエブを用いることによって得ることができる。
　また第２部材が吸収性シートや吸収体である場合には、例えば、吸収性シートや吸収体を構成する繊維、繊維シート及び吸水性ポリマーの坪量を適宜調整することによって得ることができる。 The second fiber layer having the above-mentioned physical properties is, for example, a fiber subjected to air-through treatment using a fiber made of PET resin or PP resin as a constituent fiber, a PET / HDPE core-sheath composite fiber, or the like in the manufacturing method described later. It can be obtained by using the web.
When the second member is an absorbent sheet or an absorbent body, it can be obtained, for example, by appropriately adjusting the basis weight of the fibers, the fiber sheet and the water-absorbing polymer constituting the absorbent sheet or the absorbent body.
　第２部材又は第２繊維層の厚みは、例えば以下の方法で測定することができる。
　まず、測定対象物の断面を目視やＳＥＭにより観察し、繊維径や繊維間距離、あるいは部材間の境界などを観察する等して、複数の繊維層を有する衛生用不織布であるか、又は衛生用不織布と衛生用不織布以外の第２部材とが存在することを確認する。
　測定対象物が衛生品である場合、衛生品を液体窒素に浸漬させるなどして構造を固定したあと、測定対象の衛生品から、衛生用不織布と、衛生用不織布以外の第２部材とを丁寧に剥がして分離する。そして、分離した部材を、後述する実施例にて詳述する接触冷感ｑｍａｘの測定に供し、ｑｍａｘの値が最も高い繊維シートを衛生用不織布とし、該衛生用不織布に隣接する部材を第２部材とする。
　そして、プレートを載置する等して、分離した第２部材に９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）の荷重を付与した状態で、その状態での厚みをレーザー変位計を用いて測定し、これを第２部材の厚みとする。
　測定対象物が複層構造の衛生用不織布である場合、上述の方法で測定したｑｍａｘの値が最も高い面側の繊維層が第１繊維層であり、第１繊維層に隣接する繊維層を第２繊維層とし、第２繊維層を上述した測定に供する。 The thickness of the second member or the second fiber layer can be measured by, for example, the following method.
First, the cross section of the object to be measured is visually or SEM observed, and the fiber diameter, the distance between the fibers, the boundary between the members, etc. are observed to be a sanitary non-woven fabric having a plurality of fiber layers, or hygiene. Confirm that the non-woven fabric for use and the second member other than the non-woven fabric for hygiene are present.
When the object to be measured is a sanitary product, after fixing the structure by immersing the sanitary product in liquid nitrogen, carefully select the sanitary non-woven fabric and the second member other than the sanitary non-woven fabric from the sanitary product to be measured. Peel off and separate. Then, the separated members are subjected to the measurement of the cool contact feeling q max described in detail in Examples described later, the fiber sheet having the highest q max value is used as a sanitary non-woven fabric, and the member adjacent to the sanitary non-woven fabric is used. It is used as the second member.
Then, with a load of 9.8 mN / cm 2 (1 gf / cm 2 ) applied to the separated second member by placing a plate or the like, the thickness in that state is measured using a laser displacement meter. Then, this is taken as the thickness of the second member.
When the object to be measured is a sanitary non-woven fabric having a multi-layer structure, the fiber layer on the surface side having the highest q max value measured by the above method is the first fiber layer, and the fiber layer adjacent to the first fiber layer. Is used as the second fiber layer, and the second fiber layer is subjected to the above-mentioned measurement.
　また衛生品全体において、９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重下での圧縮変形量が、好ましくは０．３ｍｍ以上、より好ましくは０．４ｍｍ以上のものである。また、同荷重下での衛生品全体の圧縮変形量が、好ましくは１５ｍｍ以下、より好ましくは１０ｍｍ以下のものである。
　このような構成となっていることによって、不織布全体に柔軟性を発現させて使用感を向上させることができるとともに、表面の少なくとも一部がポリエチレン樹脂からなる繊維を含む第１繊維集合体の着用者への接触面積を高めて、冷感を着用者に効率的に知覚させることができる。 In addition, the amount of compressive deformation under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.4 mm or more in the entire hygienic product. Further, the amount of compressive deformation of the entire sanitary product under the same load is preferably 15 mm or less, more preferably 10 mm or less.
With such a configuration, it is possible to develop flexibility in the entire non-woven fabric and improve the usability, and to wear the first fiber aggregate containing fibers in which at least a part of the surface is made of polyethylene resin. The contact area with the person can be increased so that the wearer can efficiently perceive the feeling of coldness.
　上述した圧縮変形量は、例えば、エアスルー法であれば、熱風の温度や風速を通常採用される条件よりも低くすることや、繊維本数を増加させたり、熱風の温度よりも融点が高い樹脂を含む繊維を用いたりすることで、繊維どうしの融着性を下げるように構成することで容易に達成される。
　これに加えて、又はこれに代えて、繊維層を２層以上設けて、１つの繊維層のみに他の繊維層よりも圧縮変形量が高い層を設けたり、１つの繊維層について坪量を他の繊維層よりも増加させたり、１つの繊維層について融点の高い繊維を混綿するなどといった構成を採用することによって、容易に達成することができる。 For example, in the case of the air-through method, the above-mentioned amount of compression deformation is such that the temperature and wind speed of hot air are lower than those normally adopted, the number of fibers is increased, and a resin having a melting point higher than the temperature of hot air is used. This can be easily achieved by using fibers containing the fibers so as to reduce the cohesiveness between the fibers.
In addition to or instead of this, two or more fiber layers are provided, and only one fiber layer is provided with a layer having a higher amount of compression deformation than the other fiber layers, or the basis weight of one fiber layer is determined. This can be easily achieved by adopting a structure in which the number of fibers is increased as compared with other fiber layers, or fibers having a high melting point are mixed with one fiber layer.
　圧縮変形量は、例えば、カトーテック株式会社製のＫＥＳ‐ＦＢ－３圧縮試験機を用いて測定することができる。測定対象の衛生用不織布から一定の大きさの切片をサンプルとして用いる。サンプルを試験機の試験台に取り付け、面積２ｃｍ２の円形平面を持つ鋼板間で圧縮する。圧縮速度は０．０２ｍｍ／ｓｅｃ、圧縮最大荷重は９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）とする。無荷重時の厚みを厚みＴ０（ｍｍ）とし、９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重時の厚みを厚みＴｍ（ｍｍ）としたときに、圧縮変形量（ｍｍ）は、厚みＴ０から厚みＴｍを差し引いた「Ｔ０－Ｔｍ」として算出することができる。 The amount of compression deformation can be measured using, for example, a KES-FB-3 compression tester manufactured by Kato Tech Co., Ltd. A section of a certain size is used as a sample from the sanitary non-woven fabric to be measured. The sample is mounted on the test bench of the testing machine and compressed between steel plates having a circular plane with an area of 2 cm 2. The compression rate is 0.02 mm / sec, and the maximum compression load is 9.8 mN / cm 2 (1 gf / cm 2 ). When the thickness under no load is T0 (mm) and the thickness is 9.8 mN / cm 2 (1 gf / cm 2 ), the thickness under load is Tm (mm). It can be calculated as "T0-Tm" obtained by subtracting the thickness Tm from.
　第２部材が吸収性シートの場合の全体の坪量は、好ましくは４０ｇ／ｍ２以上、より好ましくは６０ｇ／ｍ２以上、更に好ましくは７０ｇ／ｍ２以上、また好ましくは５００ｇ／ｍ２以下、より好ましくは４００ｇ／ｍ２以下、更に好ましくは３００ｇ／ｍ２以下である。
　第２部材が吸収体である場合の全体の坪量は、好ましくは３０ｇ／ｍ２以上、より好ましくは４０ｇ／ｍ２以上、更に好ましくは５０ｇ／ｍ２以上、また好ましくは６００ｇ／ｍ２以下、より好ましくは５５０ｇ／ｍ２以下、更に好ましくは５００ｇ／ｍ２以下である。 When the second member is an absorbent sheet, the total basis weight is preferably 40 g / m 2 or more, more preferably 60 g / m 2 or more, further preferably 70 g / m 2 or more, and preferably 500 g / m 2 or less. , More preferably 400 g / m 2 or less, still more preferably 300 g / m 2 or less.
When the second member is an absorber, the total basis weight is preferably 30 g / m 2 or more, more preferably 40 g / m 2 or more, further preferably 50 g / m 2 or more, and preferably 600 g / m 2 or less. , More preferably 550 g / m 2 or less, still more preferably 500 g / m 2 or less.
　以上は本発明の衛生用不織布及び該衛生用不織布を備える衛生品（吸収性物品を含む）に関する説明であったところ、以下に本発明の衛生用不織布の好適な製造方法を説明する。本製造方法は、表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブにエアスルー処理を行って、繊維集合体を得る工程（エアスルー工程）を備える。
　これに加えて、得られた繊維集合体に圧密化処理を行う工程（圧密化工程）を採用することが好ましい。
　また、本製造方法において用いられる繊維は、その熱伝導率が上述の値の範囲であることも好ましい。 The above is the description of the sanitary nonwoven fabric of the present invention and the sanitary products (including absorbent articles) provided with the sanitary nonwoven fabric. Hereinafter, a suitable manufacturing method of the sanitary nonwoven fabric of the present invention will be described. This manufacturing method includes a step (air-through step) of obtaining a fiber aggregate by performing an air-through treatment on a web of fibers whose surface is at least partly made of polyethylene resin.
In addition to this, it is preferable to adopt a step of performing a consolidation treatment on the obtained fiber aggregate (consolidation step).
Further, it is also preferable that the fiber used in the present production method has a thermal conductivity in the range of the above-mentioned values.
　まず、表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブを形成する。繊維ウエブは、例えば公知のカード機を用いたカード法によって形成することができる。 First, at least a part of the surface forms a web of fibers made of polyethylene resin. The fiber web can be formed, for example, by a card method using a known card machine.
　次に、繊維ウエブに対して熱風を吹き付けるエアスルー処理を行って、表面の少なくとも一部がポリエチレン樹脂からなる繊維の集合体を得る。本工程は、繊維のウエブを不織布化する工程であり、このように作製された繊維集合体は、一般的にエアスルー不織布と呼ばれるものである。 Next, an air-through treatment is performed in which hot air is blown onto the fiber web to obtain an aggregate of fibers whose surface is at least partly made of polyethylene resin. This step is a step of making a web of fibers into a non-woven fabric, and the fiber aggregate thus produced is generally called an air-through non-woven fabric.
　一般的に、ポリエチレン樹脂を含む繊維ウエブをエアスルー加工する場合、製造効率の観点から、ポリエチレン樹脂を鞘とし、ポリエチレン樹脂以外の高融点樹脂を芯とした芯鞘繊維が主に用いられ、ポリエチレン樹脂のみからなる繊維をエアスルー加工によって不織布化することは、非常に困難である。また、芯鞘繊維を用いることは、得られるエアスルー不織布の風合いや強度を高める点で有利であるが、熱伝導性の向上に起因して使用者に冷感を知覚させる点では改善の余地があった。
　これらの改善点に関して本発明者が鋭意検討したところ、エアスルー工程における熱風の温度や風速を制御することによって、ポリエチレン樹脂のみからなる繊維を用いた場合であっても、良好な風合い及び強度を有するエアスルー不織布を効率よく製造できることを見出した。 Generally, when a fiber web containing a polyethylene resin is air-through processed, a core-sheath fiber having a polyethylene resin as a sheath and a refractory resin other than the polyethylene resin as a core is mainly used from the viewpoint of manufacturing efficiency. It is very difficult to make a fiber composed of chisel into a polyethylene by air-through processing. In addition, the use of core-sheath fibers is advantageous in that it enhances the texture and strength of the obtained air-through non-woven fabric, but there is room for improvement in that the user perceives a feeling of coldness due to the improvement in thermal conductivity. there were.
As a result of diligent studies by the present inventor regarding these improvements, by controlling the temperature and wind speed of hot air in the air-through process, even when a fiber made of only polyethylene resin is used, it has a good texture and strength. We have found that air-through non-woven fabrics can be produced efficiently.
　エアスルー工程において、繊維ウエブに吹き付ける熱風は、その温度及び風速を特定の範囲とすることが好ましい。詳細には、繊維ウエブに吹き付ける熱風の温度は、繊維ウエブを構成する繊維表面を構成する樹脂の融点Ｍ（℃）との関係において、得られる衛生用不織布の風合いを良好にする観点から、好ましくは融点Ｍ＋４℃以下、より好ましくは融点Ｍ＋３℃以下、更に好ましくは融点Ｍ＋２℃以下の範囲とすることができる。
　また、繊維ウエブを構成する繊維どうしを適度に融着させて、使用に耐えうる強度を衛生用不織布に発現させる観点から、繊維ウエブに吹き付ける熱風の温度は、好ましくは融点Ｍ－４℃以上、より好ましくは融点Ｍ－２℃以上、更に好ましくは融点Ｍの温度以上の範囲とすることができる。
　上述した熱風の温度は、熱風の吹き出し口での温度とする。この温度は、例えば吹き出し口又はそのできるだけ近い位置に熱電対を取り付けて測定することができる。 In the air-through step, it is preferable that the temperature and the wind speed of the hot air blown to the fiber web are within a specific range. Specifically, the temperature of the hot air blown onto the fiber web is preferable from the viewpoint of improving the texture of the obtained sanitary non-woven fabric in relation to the melting point M (° C.) of the resin constituting the fiber surface constituting the fiber web. Can be in the range of melting point M + 4 ° C. or lower, more preferably melting point M + 3 ° C. or lower, still more preferably melting point M + 2 ° C. or lower.
Further, from the viewpoint of appropriately fusing the fibers constituting the fiber web to develop the strength that can withstand use in the sanitary non-woven fabric, the temperature of the hot air blown to the fiber web is preferably the melting point M-4 ° C. or higher. It can be more preferably in the range of melting point M-2 ° C. or higher, more preferably in the range of melting point M or higher.
The temperature of the hot air described above is the temperature at the outlet of the hot air. This temperature can be measured, for example, by attaching a thermocouple to the outlet or as close as possible to it.
　繊維ウエブを構成する繊維として、例えば、表面がＨＤＰＥ（融点Ｍ：１３０℃）によって構成された繊維を用いる場合、熱風の温度は、好ましくは１２６℃以上、より好ましくは１２８℃以上、更に好ましくは１３０℃以上とすることができる。
　また上述の条件における熱風の温度は、好ましくは１３４℃以下、より好ましくは１３３℃以下、更に好ましくは１３２℃以下とすることができる。 When, for example, a fiber whose surface is composed of HDPE (melting point M: 130 ° C.) is used as the fiber constituting the fiber web, the temperature of the hot air is preferably 126 ° C. or higher, more preferably 128 ° C. or higher, still more preferably 128 ° C. or higher. The temperature can be 130 ° C. or higher.
The temperature of the hot air under the above conditions can be preferably 134 ° C. or lower, more preferably 133 ° C. or lower, and even more preferably 132 ° C. or lower.
　繊維表面を構成する樹脂の融点Ｍは、示差走査熱量測定計（日立ハイテクサイエンス株式会社製、ＤＳＣ７０００ｘ）を用いて測定することができる。まず、細かく裁断した繊維試料（１ｍｇ）を用いて、該試料の熱分析を昇温速度１０℃／ｍｉｎで行い、各樹脂の融解ピーク温度を測定する。融点は、一回目昇温時の融解ピーク温度で定義される。融点がこの方法で明確に測定できない場合、この樹脂を「融点を持たない樹脂」と定義する。融点を持たない樹脂である場合、軟化点を融点Ｍとする。 The melting point M of the resin constituting the fiber surface can be measured using a differential scanning calorimetry meter (DSC7000x, manufactured by Hitachi High-Tech Science Co., Ltd.). First, using a finely cut fiber sample (1 mg), thermal analysis of the sample is performed at a heating rate of 10 ° C./min, and the melting peak temperature of each resin is measured. The melting point is defined by the melting peak temperature at the first temperature rise. If the melting point cannot be clearly measured by this method, this resin is defined as "resin having no melting point". In the case of a resin having no melting point, the softening point is defined as the melting point M.
　またエアスルー工程において、繊維ウエブに吹き付ける熱風の風速は、繊維ウエブの厚み方向に熱風を十分に通過させて、繊維どうしの融着を形成させやすくする観点から、好ましくは０．６ｍ／秒以上、更に好ましくは１ｍ／秒以上である。
　また同様の観点から、繊維ウエブに吹き付ける熱風の風速は、好ましくは２ｍ／秒以下、更に好ましくは１．４ｍ／秒以下である。
　上述した温度及び風速の条件でエアスルー工程を行うことによって、繊維ウエブを構成する繊維表面に存在するポリエチレン樹脂を溶融又は軟化させて、繊維どうしが融着した部位をランダムに形成することができるので、製造される衛生用不織布は、エアスルー不織布に起因する柔軟性及び良好な風合いを発現しつつ、使用に耐えうる強度が発現したものとなる。 Further, in the air-through step, the wind speed of the hot air blown to the fiber web is preferably 0.6 m / sec or more from the viewpoint of allowing the hot air to sufficiently pass in the thickness direction of the fiber web and facilitating the formation of fusion between the fibers. More preferably, it is 1 m / sec or more.
From the same viewpoint, the wind speed of the hot air blown to the fiber web is preferably 2 m / sec or less, more preferably 1.4 m / sec or less.
By performing the air-through step under the above-mentioned temperature and wind velocity conditions, the polyethylene resin existing on the fiber surface constituting the fiber web can be melted or softened, and a portion where the fibers are fused can be randomly formed. The sanitary non-woven fabric produced is one in which the strength that can withstand use is exhibited while exhibiting the flexibility and good texture caused by the air-through non-woven fabric.
　エアスルー工程における繊維ウエブの搬送速度は、上述の温度及び風速の範囲において、好ましくは３ｍ／ｍｉｎ以上、更に好ましくは１０ｍ／ｍｉｎ以上であり、好ましくは２００ｍ／ｍｉｎ以下、更に好ましくは１６０ｍ／ｍｉｎ以下である。 The transport speed of the fiber web in the air-through step is preferably 3 m / min or more, more preferably 10 m / min or more, preferably 200 m / min or less, still more preferably 160 m / min or less in the above temperature and wind speed ranges. Is.
　上述の工程を経て得られた繊維集合体は、不織布化されているので、これをこのまま本発明の衛生用不織布として用いてもよい。この衛生用不織布は、エアスルー不織布である。 Since the fiber aggregate obtained through the above steps is made into a non-woven fabric, it may be used as it is as the non-woven fabric for hygiene of the present invention. This sanitary non-woven fabric is an air-through non-woven fabric.
　所定の体積充填率を有する衛生用不織布を容易に得る観点から、上述の工程を経て得られた繊維集合体に対して圧密化処理を更に行うことが好ましい（圧密化工程）。本工程における圧密化処理は、繊維集合体をその厚み方向に加圧して圧縮することができる方法を採用することができる。 From the viewpoint of easily obtaining a sanitary non-woven fabric having a predetermined volume filling rate, it is preferable to further perform a consolidation treatment on the fiber aggregate obtained through the above steps (consolidation step). For the consolidation treatment in this step, a method capable of pressurizing and compressing the fiber aggregate in the thickness direction thereof can be adopted.
　圧密化処理としては、例えば二つの金属平板の間に繊維集合体を配して加圧する方法（以下、この方法を「プレス法」ともいう。）や、一対のロール間に繊維集合体を導入して加圧する方法（以下、この方法を「カレンダー法」ともいう。）によって行うことができる。
　圧密化処理は、一回のみ行ってもよく、必要に応じて、同一の又は異なる方法で複数回行ってもよい。また圧密化処理における温度は、室温であってもよく、加熱状態であってもよく、あるいはこれらの組み合わせであってもよい。 As the consolidation treatment, for example, a method of arranging a fiber aggregate between two metal flat plates and applying pressure (hereinafter, this method is also referred to as a "press method") or introducing a fiber aggregate between a pair of rolls. It can be carried out by a method of pressurizing (hereinafter, this method is also referred to as a "calendar method").
The consolidation treatment may be performed only once, or may be performed a plurality of times by the same or different methods as required. Further, the temperature in the consolidation treatment may be room temperature, a heated state, or a combination thereof.
　圧密化処理の条件は、加熱状態で加圧することが好ましい。詳細には、圧密化処理における加圧条件は、繊維集合体を十分に圧密化させて、体積充填率の高い衛生用不織布を得やすくする観点から、プレス法を用いる場合、面圧で表して、好ましくは５ＭＰａ以上、更に好ましくは１０ＭＰａ以上である。
　また、繊維集合体をフィルム化させずに、構成繊維どうしの境界が明瞭となっている繊維形状を保ちつつ、得られる衛生用不織布の風合いを良好なものとする観点から、圧密化処理における加圧条件は、プレス法を用いる場合、面圧で表して、好ましくは７２ＭＰａ以下、更に好ましくは３２ＭＰａ以下とすることができる。 As for the conditions of the consolidation treatment, it is preferable to pressurize in a heated state. Specifically, the pressurizing conditions in the consolidation treatment are expressed in terms of surface pressure when the press method is used, from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 5 MPa or more, more preferably 10 MPa or more.
Further, from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film, it is added in the consolidation treatment. When the press method is used, the pressure condition can be expressed in terms of surface pressure, preferably 72 MPa or less, and more preferably 32 MPa or less.
　また、カレンダー法を採用したときの加圧条件は、繊維集合体を十分に圧密化させて、体積充填率の高い衛生用不織布を得やすくする観点から、線圧で表して、好ましくは７８．４Ｎ／ｃｍ（８ｋｇｆ／ｃｍ）以上、更に好ましくは１２７．４Ｎ／ｃｍ（１３ｋｇｆ／ｃｍ）以上である。
　また、繊維集合体をフィルム化させずに、構成繊維どうしの境界が明瞭となっている繊維形状を保ちつつ、得られる衛生用不織布の風合いを良好なものとする観点から、カレンダー法を採用したときの加圧条件は、線圧で表して、好ましくは６８６Ｎ／ｃｍ（７０ｋｇｆ／ｃｍ）以下、更に好ましくは２９４Ｎ／ｃｍ（３０ｋｇｆ／ｃｍ）以下である。 Further, the pressurizing condition when the calendar method is adopted is expressed in linear pressure from the viewpoint of sufficiently compacting the fiber aggregate to facilitate obtaining a sanitary non-woven fabric having a high volume filling rate, preferably 78. It is 4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more.
In addition, the calendar method was adopted from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film. The pressurizing condition at this time is preferably 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less in terms of linear pressure.
　また、圧密化処理における加熱温度は、繊維集合体を十分に圧密化させて、体積充填率の高い衛生用不織布を得やすくする観点から、プレス法及びカレンダー法のいずれの場合であっても、好ましくは７０℃以上、更に好ましくは８０℃以上である。
　繊維集合体をフィルム化させずに、構成繊維どうしの境界が明瞭となっている繊維形状を保ちつつ、得られる衛生用不織布の風合いを良好なものとする観点から、プレス法及びカレンダー法のいずれの場合であっても、好ましくは１２０℃以下、更に好ましくは１１０℃以下とすることができる。
　圧密化処理において加熱する場合は、プレス法であれば金属平板を上述の温度範囲に加熱すればよく、カレンダー法であればロールの周面を上述の温度範囲に加熱すればよい。 Further, the heating temperature in the consolidation treatment can be set by either the press method or the calendar method from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 70 ° C. or higher, more preferably 80 ° C. or higher.
Either the press method or the calendar method is used from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film. Even in the case of, the temperature can be preferably 120 ° C. or lower, more preferably 110 ° C. or lower.
When heating in the consolidation treatment, the metal flat plate may be heated to the above temperature range in the press method, and the peripheral surface of the roll may be heated to the above temperature range in the calendar method.
　圧密化処理における加圧時間は、繊維集合体を構成する繊維の繊維形状が保たれ、且つ圧密化可能な条件であれば、適宜設定可能である。
　例えば、プレス法を用いた場合、上述した圧力及び温度条件における加圧時間は、一回の圧密化処理当たり、好ましくは５秒以上、更に好ましくは１０秒以上とすることができる。
　また、プレス法を用いた場合、上述した圧力及び温度条件における加圧時間は、一回の圧密化処理当たり、好ましくは２５秒以下、更に好ましくは２０秒以下とすることができる。 The pressurization time in the consolidation treatment can be appropriately set as long as the fiber shape of the fibers constituting the fiber aggregate is maintained and the consolidation is possible.
For example, when the press method is used, the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 5 seconds or longer, more preferably 10 seconds or longer per consolidation treatment.
When the press method is used, the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 25 seconds or less, more preferably 20 seconds or less per consolidation treatment.
　例えば、カレンダー法を用いた場合、上述した圧力及び温度条件における加圧時間は、一回の圧密化処理当たり、好ましくは０．０１秒以上、更に好ましくは０．０４秒以上とすることができる。
　また、カレンダー法を用いた場合、上述した圧力及び温度条件における加圧時間は、一回の圧密化処理当たり、好ましくは０．１秒以下、更に好ましくは０．０８秒以下とすることができる。 For example, when the calendar method is used, the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.01 seconds or more, more preferably 0.04 seconds or more per consolidation treatment. ..
When the calendar method is used, the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.1 seconds or less, more preferably 0.08 seconds or less per consolidation treatment. ..
　以上の条件で圧密化処理を行うことによって、繊維集合体を厚み方向に圧縮して、所定の体積充填率を有する衛生用不織布を容易に得ることができる。
　特に、上述した圧力及び温度の範囲では、繊維の構成樹脂の溶融が生じにくい状態でありながら、熱処理による形態安定性及び寸法安定性を高めることができるので、製造後も所定の体積充填率を維持した衛生用不織布を得ることができる。
　また、横断面形状が真円形である繊維を用いた場合、圧密化処理によって、繊維の横断面形状を扁平にすることができるので、体積充填率を高めることができるという利点もある。
　上述の方法によって得られた衛生用不織布は、圧密化処理を経た場合でも、エアスルー不織布である。 By performing the consolidation treatment under the above conditions, the fiber aggregate can be compressed in the thickness direction to easily obtain a sanitary non-woven fabric having a predetermined volume filling rate.
In particular, in the above-mentioned pressure and temperature ranges, the morphological stability and dimensional stability due to heat treatment can be improved while the fiber constituent resin is unlikely to melt, so that a predetermined volume filling rate can be maintained even after production. A maintained non-woven fabric for hygiene can be obtained.
Further, when a fiber having a perfectly circular cross-sectional shape is used, the cross-sectional shape of the fiber can be flattened by the consolidation treatment, so that there is an advantage that the volume filling rate can be increased.
The sanitary non-woven fabric obtained by the above method is an air-through non-woven fabric even after undergoing a consolidation treatment.
　本発明の衛生用不織布は、上述した製造方法に代えて、スパンボンド法に基づく方法によっても製造することができる。このように製造された衛生用不織布は、スパンボンド不織布である。
　詳細には、繊維の原料樹脂を溶融状態で多数の細孔を有する紡糸口金から押し出すとともに、押し出された樹脂をロール等で延伸して長繊維とし、それらの長繊維をネットコンベア上に集積して、表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブを得る。その後、繊維ウエブをエンボスロール間に導入して、加熱及び加圧による圧密化（熱圧着）を行い、本発明の衛生用不織布を得る。つまり、本方法は、繊維ウエブの不織布化と圧密化処理とを同時に行うものである。エンボスロールにおける温度及び加圧条件は、上述した圧密化処理の条件と同様の範囲とすることができる。 The non-woven fabric for hygiene of the present invention can be produced by a method based on the spunbond method instead of the above-mentioned production method. The sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric.
Specifically, the raw material resin of the fiber is extruded from a spinneret having a large number of pores in a molten state, and the extruded resin is stretched with a roll or the like to form long fibers, and these long fibers are accumulated on a net conveyor. To obtain a web of fibers in which at least a part of the surface is made of polyethylene resin. Then, a fiber web is introduced between the emboss rolls and compacted (thermocompression bonding) by heating and pressurizing to obtain the sanitary nonwoven fabric of the present invention. That is, in this method, the non-woven fabric of the fiber web and the consolidation treatment are performed at the same time. The temperature and pressurizing conditions in the embossed roll can be in the same range as the conditions of the consolidation treatment described above.
　目的とする衛生用不織布において、複層構造のものを製造する場合には、例えば、カード法によって形成した熱可塑性樹脂を含む第２繊維ウエブを、表面の少なくとも一部がポリエチレン樹脂からなる繊維ウエブに積層して、繊維ウエブの積層体とする。そして、該積層体に対してエアスルー処理を施すことによって、複層構造の繊維集合体であるエアスルー不織布を得ることができる。このとき、吹き付ける熱風の温度は、最も融点の低い樹脂の融点を上述した融点Ｍとして、熱風の温度を決定することが好ましい。
　複層構造の衛生用不織布を製造する別の形態としては、表面の少なくとも一部がポリエチレン樹脂からなる繊維ウエブと、熱可塑性樹脂を含む第２繊維ウエブとをそれぞれエアスルー処理して繊維シートをそれぞれ得た後、これらの繊維シートを接着剤を介して接合することによって得ることができる。 In the case of producing a multi-layered non-woven fabric for sanitary purposes, for example, a second fiber web containing a thermoplastic resin formed by the card method is used, and a fiber web having at least a part of its surface made of polyethylene resin is used. To form a laminated body of fiber web. Then, by performing the air-through treatment on the laminated body, an air-through non-woven fabric which is a fiber aggregate having a multi-layer structure can be obtained. At this time, it is preferable that the temperature of the hot air to be blown is determined by setting the melting point of the resin having the lowest melting point as the above-mentioned melting point M.
As another form for producing a multi-layered sanitary non-woven fabric, a fiber web in which at least a part of the surface is made of polyethylene resin and a second fiber web containing a thermoplastic resin are each air-through treated to form a fiber sheet. After obtaining, these fiber sheets can be obtained by joining them with an adhesive.
　上述の工程を経て得られた繊維集合体は、これをこのまま本発明の衛生用不織布として用いてもよい。また、これに加えて、上述した条件で圧密化工程を行ってもよい。
　これに代えて、目的とする不織布は、スパンボンド法に基づく方法によっても製造することができる。製造方法としては、例えば、上述の第２繊維ウエブを、表面の少なくとも一部がポリエチレン樹脂からなる繊維ウエブに積層して、その状態で加熱及び加圧による圧密化（熱圧着）を行えばよい。このように製造された衛生用不織布は、スパンボンド不織布である。 The fiber aggregate obtained through the above steps may be used as it is as the sanitary nonwoven fabric of the present invention. In addition to this, the consolidation step may be performed under the above-mentioned conditions.
Alternatively, the non-woven fabric of interest can also be produced by a method based on the spunbond method. As a manufacturing method, for example, the above-mentioned second fiber web may be laminated on a fiber web in which at least a part of the surface is made of polyethylene resin, and in that state, consolidation (thermocompression bonding) by heating and pressurization may be performed. .. The sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric.
　以上の工程を経て、本発明の衛生用不織布を得ることができる。この衛生用不織布は、好ましくは、以後の工程で、吸収性物品等の衛生品の構成部材として組み込まれる。
　衛生用不織布を吸収性物品等の衛生品の構成材料とする場合、衛生品を製造する工程のうちのいずれかにおいて、上述の方法で製造された衛生用不織布を構成材料の一つとして用い、該衛生用不織布を切断する工程や、該衛生用不織布と衛生品を構成する他の構成材料（例えば吸収体やシート等）とを積層又は接合する等の各種操作を行う工程のうち一つ以上備えて、目的とする吸収性物品等の衛生品を製造することができる。 Through the above steps, the sanitary nonwoven fabric of the present invention can be obtained. This sanitary non-woven fabric is preferably incorporated as a constituent member of a sanitary product such as an absorbent article in a subsequent step.
When a sanitary non-woven fabric is used as a constituent material for a sanitary product such as an absorbent article, the sanitary non-woven fabric manufactured by the above method is used as one of the constituent materials in any of the steps for manufacturing the sanitary product. One or more of the steps of cutting the sanitary non-woven fabric and performing various operations such as laminating or joining the sanitary non-woven fabric and other constituent materials (for example, an absorber or a sheet) constituting the sanitary product. In preparation for this, it is possible to manufacture a sanitary product such as a target absorbent article.
　第２部材を備える衛生品を製造する場合には、例えば、上述の衛生用不織布を別途製造した後、衛生品の製造工程のいずれかの段階で第１繊維集合体としての衛生用不織布と、第２部材として、上述の吸収体や吸収性シートとを隣接させた状態で、積層又は接合すればよい。この場合、衛生用不織布は、衛生品の着用時に着用者の肌に対向する面を構成するように配してもよく、衛生品の着用時に着用者の肌に対向しない面側に配してもよい。 In the case of manufacturing a sanitary product including the second member, for example, after separately manufacturing the above-mentioned sanitary nonwoven fabric, a sanitary nonwoven fabric as a first fiber aggregate is used at any stage of the manufacturing process of the sanitary product. As the second member, the above-mentioned absorbent body and absorbent sheet may be laminated or joined in a state of being adjacent to each other. In this case, the sanitary non-woven fabric may be arranged so as to form a surface facing the wearer's skin when wearing the sanitary product, or may be arranged on the surface side not facing the wearer's skin when wearing the sanitary product. May be good.
　以上、本発明をその好ましい実施形態に基づき説明したが、本発明は前記実施形態に制限されない。 Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment.
　上述した本発明の実施形態に関し、更に以下の衛生用不織布及びこれを備える吸収性物品、並びに衛生用不織布の製造方法を開示する。
＜１＞
　表面の少なくとも一部がポリエチレン樹脂からなる繊維を含有し、
　体積充填率が３．５％以上であり、より好ましくは７％以上、更に好ましくは１０％以上、更により好ましくは１４％以上である、衛生用不織布。 Regarding the above-described embodiment of the present invention, the following sanitary nonwoven fabric, an absorbent article provided with the same, and a method for producing the sanitary nonwoven fabric are disclosed.
<1>
At least part of the surface contains fibers made of polyethylene resin,
A sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 10% or more, still more preferably 14% or more.
＜２＞
　熱伝導率が０．１１Ｗ／ｍＫ以上、より好ましくは０．１３Ｗ／ｍＫ以上、更に好ましくは０．１５Ｗ／ｍＫ以上である繊維を表面の少なくとも一部に含有し、
　体積充填率が３．５％以上であり、より好ましくは７％以上、更に好ましくは１４％以上である、衛生用不織布。 <2>
At least a part of the surface contains fibers having a thermal conductivity of 0.11 W / mK or more, more preferably 0.13 W / mK or more, and even more preferably 0.15 W / mK or more.
A sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 14% or more.
＜３＞
　前記体積充填率が、６０％以下、好ましくは５０％以下、より好ましくは３０％以上である、前記＜１＞又は＜２＞に記載の衛生用不織布。
＜４＞
　前記繊維は、（ｉ）繊維の外表面及び内部がともにポリエチレン樹脂からなるか、又は（ii）ポリエチレン樹脂からなる低融点成分と、低融点成分よりも融点の高い高融点成分とを含み、低融点成分が繊維表面の少なくとも一部を長さ方向に連続して存在している二成分系の複合繊維である、前記＜１＞～＜３＞のいずれか一に記載の衛生用不織布。
＜５＞
　前記衛生用不織布に含まれる樹脂の全質量に対するポリエチレン樹脂の含有量は、７０質量％以上１００質量％以下、好ましくは８０質量％以上、より好ましくは９０質量％以上、更に好ましくは１００質量％以下である、前記＜１＞～＜４＞のいずれか一に記載の衛生用不織布。 <3>
The sanitary nonwoven fabric according to <1> or <2>, wherein the volume filling rate is 60% or less, preferably 50% or less, more preferably 30% or more.
<4>
The fiber contains (i) a low melting point component made of polyethylene resin on both the outer surface and the inside of the fiber, or (ii) a low melting point component made of polyethylene resin, and a high melting point component having a melting point higher than that of the low melting point component. The sanitary non-woven fabric according to any one of <1> to <3>, wherein the melting point component is a two-component composite fiber in which at least a part of the fiber surface is continuously present in the length direction.
<5>
The content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is 70% by mass or more and 100% by mass or less, preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 100% by mass or less. The sanitary nonwoven fabric according to any one of <1> to <4>.
＜６＞
　前記繊維を構成する樹脂がポリエチレン樹脂のみである、前記＜１＞～＜５＞のいずれか一に記載の衛生用不織布。
＜７＞
　前記繊維の横断面形状は、長軸と短軸とを有し、
　前記短軸の長さに対する前記長軸の長さの比（長軸の長さ／短軸の長さ）が１．５以上１０以下である、前記＜１＞～＜６＞のいずれか一に記載の衛生用不織布。
＜８＞
　断面視において、前記繊維どうしが複数点で接触している、前記＜１＞～＜７＞のいずれか一に記載の衛生用不織布。
＜９＞
　４．９ｍＮ／ｃｍ２荷重下における厚みが０．１ｍｍ以上３ｍｍ以下である、前記＜１＞～＜８＞のいずれか一に記載の衛生用不織布。 <6>
The sanitary non-woven fabric according to any one of <1> to <5>, wherein the resin constituting the fiber is only polyethylene resin.
<7>
The cross-sectional shape of the fiber has a major axis and a minor axis, and has a major axis and a minor axis.
Any one of <1> to <6>, wherein the ratio of the length of the major axis to the length of the minor axis (length of the major axis / length of the minor axis) is 1.5 or more and 10 or less. Sanitary non-woven fabric described in.
<8>
The sanitary nonwoven fabric according to any one of <1> to <7>, wherein the fibers are in contact with each other at a plurality of points in a cross-sectional view.
<9>
4.9 mN / cm 2 The sanitary nonwoven fabric according to any one of <1> to <8>, which has a thickness of 0.1 mm or more and 3 mm or less under a load.
＜１０＞
　４．９ｍＮ／ｃｍ２荷重下における厚みが、０．３ｍｍ以上０．５ｍｍ以下である、前記＜１＞～＜９＞のいずれか一に記載の衛生用不織布。
＜１１＞
　坪量が１５ｇ／ｍ２以上１４０ｇ／ｍ２以下である、前記＜１＞～＜１０＞のいずれか一に記載の衛生用不織布。
＜１２＞
　坪量が、２５ｇ／ｍ２以上５０ｇ／ｍ２以下である、前記＜１＞～＜１１＞のいずれか一に記載の衛生用不織布。 <10>
4.9 mN / cm 2 The sanitary nonwoven fabric according to any one of <1> to <9>, wherein the thickness under a load is 0.3 mm or more and 0.5 mm or less.
<11>
The sanitary non-woven fabric according to any one of <1> to <10>, wherein the basis weight is 15 g / m 2 or more and 140 g / m 2 or less.
<12>
The sanitary non-woven fabric according to any one of <1> to <11>, wherein the basis weight is 25 g / m 2 or more and 50 g / m 2 or less.
＜１３＞
　前記ポリエチレン樹脂として高密度ポリエチレン樹脂を含み、好ましくは高密度ポリエチレン樹脂のみからなる、前記＜１＞～＜１２＞のいずれか一に記載の衛生用不織布。
＜１４＞
　前記繊維の繊維径は、３μｍ以上、好ましくは５μｍ以上である、前記＜１＞～＜１３＞のいずれか一に記載の衛生用不織布。
＜１５＞
　前記繊維の繊維径は、７０μｍ以下、好ましくは５０μｍ以下である、前記＜１＞～＜１４＞のいずれか一に記載の衛生用不織布。
＜１６＞
　エアスルー不織布である、前記＜１＞～＜１５＞のいずれか一に記載の衛生用不織布。 <13>
The sanitary non-woven fabric according to any one of <1> to <12>, wherein the polyethylene resin contains a high-density polyethylene resin, and preferably consists only of the high-density polyethylene resin.
<14>
The sanitary nonwoven fabric according to any one of <1> to <13>, wherein the fiber diameter of the fiber is 3 μm or more, preferably 5 μm or more.
<15>
The sanitary nonwoven fabric according to any one of <1> to <14>, wherein the fiber diameter of the fiber is 70 μm or less, preferably 50 μm or less.
<16>
The sanitary non-woven fabric according to any one of <1> to <15>, which is an air-through non-woven fabric.
＜１７＞
　前記＜１＞～＜１６＞のいずれか一に記載の衛生用不織布を備える、衛生品。
＜１８＞
　前記衛生用不織布が、前記衛生品の使用者の肌に対向する面を構成している、前記＜１７＞に記載の衛生品。
＜１９＞
　吸収性物品である、前記＜１７＞又は＜１８＞に記載の衛生品。
＜２０＞
　前記衛生用不織布が、前記衛生品の外面に配されている、前記＜１７＞～＜１９＞のいずれか一に記載の衛生品。
＜２１＞
　使い捨てである、前記＜１＞～＜２０＞のいずれか一に記載の衛生用不織布又は衛生品。 <17>
A hygienic product comprising the non-woven fabric for hygiene according to any one of <1> to <16>.
<18>
The hygienic product according to <17>, wherein the hygienic non-woven fabric constitutes a surface facing the skin of the user of the hygienic product.
<19>
The hygienic product according to <17> or <18>, which is an absorbent article.
<20>
The hygiene product according to any one of <17> to <19>, wherein the hygiene non-woven fabric is arranged on the outer surface of the hygiene product.
<21>
The sanitary non-woven fabric or sanitary product according to any one of <1> to <20>, which is disposable.
＜２２＞
　表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブにエアスルー処理を行って、繊維集合体を得て、然る後に、
　前記繊維集合体に圧密化処理を行う、衛生用不織布の製造方法。
＜２３＞
　前記圧密化処理は、５ＭＰａ以上で、好ましくは１０ＭＰａ以上の面圧で行うか、又は、７８．４Ｎ／ｃｍ（８ｋｇｆ／ｃｍ）以上、更に好ましくは１２７．４Ｎ／ｃｍ（１３ｋｇｆ／ｃｍ）以上の線圧で行い、且つ
　７０℃以上１２０℃以下で行う、前記＜２２＞に記載の衛生用不織布の製造方法。
＜２４＞
　前記圧密化処理は、３０ＭＰａ以下、好ましくは２０ＭＰａ以下の面圧で行うか、又は、６８６Ｎ／ｃｍ（７０ｋｇｆ／ｃｍ）以下、更に好ましくは２９４Ｎ／ｃｍ（３０ｋｇｆ／ｃｍ）以下の線圧で行う、前記＜２２＞又は＜２３＞に記載の衛生用不織布の製造方法。
＜２５＞
　前記圧密化処理は、８０℃以上１１０℃以下で行う、前記＜２２＞～＜２４＞のいずれか一に記載の衛生用不織布の製造方法。 <22>
The web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which
A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
<23>
The consolidation treatment is carried out at a surface pressure of 5 MPa or more, preferably 10 MPa or more, or 78.4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more. The method for producing a sanitary nonwoven fabric according to the above <22>, which is carried out at linear pressure and at 70 ° C. or higher and 120 ° C. or lower.
<24>
The consolidation treatment is carried out at a surface pressure of 30 MPa or less, preferably 20 MPa or less, or a linear pressure of 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less. The method for producing a sanitary nonwoven fabric according to <22> or <23>.
<25>
The method for producing a sanitary nonwoven fabric according to any one of <22> to <24>, wherein the consolidation treatment is performed at 80 ° C. or higher and 110 ° C. or lower.
＜２６＞
　前記エアスルー処理は、前記繊維表面を構成する樹脂の融点－４℃以上且つ該樹脂の融点＋４℃以下の温度の熱風を、０．６ｍ／秒以上２ｍ／秒以下の風速で前記ウエブに吹き付けて行う、前記＜２２＞～＜２５＞のいずれか一に記載の衛生用不織布の製造方法。
＜２７＞
　前記エアスルー処理は、より好ましくは前記繊維表面を構成する樹脂の融点－２℃以上、前記融点＋２℃以下の温度の熱風を前記ウエブに吹き付けて行う、前記＜２２＞～＜２６＞のいずれか一に記載の衛生用不織布の製造方法。
＜２８＞
　前記繊維の表面が高密度ポリエチレン樹脂で構成されており、
　前記高密度ポリエチレン樹脂の融点は１３０℃であり、
　前記エアスルー処理は、１２６℃以上、好ましくは１２８℃以上、より好ましくは１３０℃以上の温度の熱風を前記ウエブに吹き付けて行う、前記＜２２＞～＜２７＞のいずれか一に記載の衛生用不織布の製造方法。
＜２９＞
　前記繊維の表面が高密度ポリエチレン樹脂で構成されており、
　前記高密度ポリエチレン樹脂の融点は１３０℃であり、
　前記エアスルー処理は、１３４℃以下、好ましくは１３３℃以下、より好ましくは１３２℃以下の温度の熱風を前記ウエブに吹き付けて行う、前記＜２２＞～＜２８＞のいずれか一に記載の衛生用不織布の製造方法。 <26>
In the air-through treatment, hot air having a melting point of -4 ° C or higher and a melting point of the resin of + 4 ° C or lower of the resin constituting the fiber surface is blown onto the web at a wind speed of 0.6 m / sec or higher and 2 m / sec or lower. The method for producing a sanitary nonwoven fabric according to any one of <22> to <25>.
<27>
The air-through treatment is more preferably performed by blowing hot air having a melting point of -2 ° C. or higher and a melting point of + 2 ° C. or lower of the resin constituting the fiber surface onto the web, according to any one of <22> to <26>. The method for producing a sanitary nonwoven fabric according to 1.
<28>
The surface of the fiber is made of high-density polyethylene resin,
The high-density polyethylene resin has a melting point of 130 ° C.
The sanitary use according to any one of <22> to <27>, wherein the air-through treatment is performed by blowing hot air having a temperature of 126 ° C. or higher, preferably 128 ° C. or higher, more preferably 130 ° C. or higher onto the web. Non-woven fabric manufacturing method.
<29>
The surface of the fiber is made of high-density polyethylene resin,
The high-density polyethylene resin has a melting point of 130 ° C.
The sanitary use according to any one of <22> to <28>, wherein the air-through treatment is performed by blowing hot air having a temperature of 134 ° C. or lower, preferably 133 ° C. or lower, more preferably 132 ° C. or lower onto the web. Non-woven fabric manufacturing method.
＜３０＞
　前記エアスルー処理は、１ｍ／秒以上１．４ｍ／秒以下の風速で前記ウエブに吹き付けて行う、前記＜２２＞～＜２９＞のいずれか一に記載の衛生用不織布の製造方法。
＜３１＞
　衛生品を製造する工程のうちのいずれかにおいて、前記＜２２＞～＜３０＞のいずれか一に記載の衛生用不織布の製造方法によって製造された衛生用不織布を構成材料の一つとして用い、該衛生用不織布を切断する工程、並びに該衛生用不織布と該衛生品を構成する他の構成材料とを積層又は接合する工程のうち一つ以上を備える、衛生品の製造方法。 <30>
The method for producing a sanitary nonwoven fabric according to any one of <22> to <29>, wherein the air-through treatment is performed by blowing onto the web at a wind speed of 1 m / sec or more and 1.4 m / sec or less.
<31>
In any of the steps of manufacturing a sanitary product, a sanitary nonwoven fabric manufactured by the method for manufacturing a sanitary nonwoven fabric according to any one of <22> to <30> is used as one of the constituent materials. A method for producing a sanitary product, comprising one or more of a step of cutting the sanitary nonwoven fabric and a step of laminating or joining the sanitary nonwoven fabric and other constituent materials constituting the sanitary product.
＜３２＞
　接触冷感ｑｍａｘが０．０６Ｗ／ｍ２以上である、前記＜１＞～＜１６＞のいずれか一に記載の衛生用不織布。
＜３３＞
　前記衛生用不織布の表面における構成繊維の面積基準での存在割合が４０％以上である、前記＜１＞～＜１６＞、＜３２＞のいずれか一に記載の衛生用不織布。
＜３４＞
　前記体積充填率が１０．０％以上である、前記＜１＞～＜１６＞、＜３２＞、＜３３＞のいずれか一に記載の衛生用不織布。
＜３５＞
　前記＜１＞～＜１６＞、＜３２＞～＜３４＞のいずれか一に記載の衛生用不織布と、該不織布に隣接して配された第２部材とを備え、
　前記第２部材は、９．８ｍＮ／ｃｍ２（１ｇｆ／ｃｍ２）荷重下での圧縮変形量が０．３ｍｍ以上である、衛生品。 <32>
The sanitary non-woven fabric according to any one of <1> to <16>, wherein the cool contact feeling q max is 0.06 W / m 2 or more.
<33>
The sanitary nonwoven fabric according to any one of <1> to <16> and <32>, wherein the presence ratio of the constituent fibers on the surface of the sanitary nonwoven fabric is 40% or more based on the area.
<34>
The sanitary nonwoven fabric according to any one of <1> to <16>, <32>, and <33>, wherein the volume filling rate is 10.0% or more.
<35>
The non-woven fabric for hygiene according to any one of <1> to <16> and <32> to <34> and a second member arranged adjacent to the non-woven fabric are provided.
The second member is a sanitary product having a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
＜３６＞
　前記第２部材が、前記衛生用不織布とは異なる繊維集合体である、前記＜３５＞に記載の衛生品。
＜３７＞
　前記第２部材が吸収体である、前記＜３６＞に記載の衛生品。
＜３８＞
　前記＜１＞～＜１６＞、＜３２＞～＜３４＞のいずれか一に記載の衛生用不織布の製造方法であって、
　表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブにエアスルー処理を行って、繊維集合体を得て、然る後に、
　前記繊維集合体に圧密化処理を行う、衛生用不織布の製造方法。 <36>
The sanitary product according to <35>, wherein the second member is a fiber aggregate different from the sanitary non-woven fabric.
<37>
The hygienic product according to <36>, wherein the second member is an absorber.
<38>
The method for producing a non-woven fabric for hygiene according to any one of <1> to <16> and <32> to <34>.
The web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which
A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
　以下、実施例により本発明を更に詳細に説明する。しかしながら本発明の範囲は、かかる実施例に制限されない。 Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited to such examples.
　〔実施例１～５〕
　ＨＤＰＥの単一樹脂からなり、横断面形状が長軸と短軸とを有する扁平且つ多葉形状（以下、この形状を、表中も含み「扁平異形」ともいう。）である繊維を用いた。繊維断面における長軸の長さ、短軸の長さ、及び短軸の長さに対する長軸の長さの比（この比を表中にて「長軸／短軸比」ともいう。）は、以下の表１に示すとおりであった。
　まず、以下の表１に示す坪量となるように調整した前記繊維のウエブをエアスルー処理し、不織布化した繊維集合体を得た。エアスルー処理の条件は、以下の表１に示すとおりとした。次いで、プレス法により、以下の表１に示す加熱及び加圧条件で繊維集合体を圧密化処理して、目的とする衛生用不織布を得た。得られた不織布はいずれも単一層のものであった。 [Examples 1 to 5]
A flat and multi-leaf shape (hereinafter, this shape is also referred to as a "flat variant") having a long axis and a short axis in cross-sectional shape, which is made of a single resin of HDPE, was used. .. The ratio of the length of the major axis, the length of the minor axis, and the length of the minor axis to the length of the minor axis in the fiber cross section (this ratio is also referred to as "major axis / minor axis ratio" in the table) is , As shown in Table 1 below.
First, the web of the fibers adjusted to have the basis weight shown in Table 1 below was air-through treated to obtain a non-woven fiber aggregate. The conditions for the air-through treatment were as shown in Table 1 below. Then, by the press method, the fiber aggregate was compacted under the heating and pressurizing conditions shown in Table 1 below to obtain the desired sanitary non-woven fabric. All of the obtained non-woven fabrics were of a single layer.
　〔実施例６～８〕
　以下の表１に示す坪量となるように調整し、且つ圧密化処理をカレンダー法によって以下の表１に示す加熱及び加圧条件で行った以外は、実施例１～５と同様にして、目的とする衛生用不織布を得た。得られた不織布はいずれも単一層のものであった。 [Examples 6 to 8]
In the same manner as in Examples 1 to 5, except that the basis weight was adjusted to be as shown in Table 1 below, and the consolidation treatment was performed by the calendar method under the heating and pressurizing conditions shown in Table 1 below. The desired sanitary non-woven fabric was obtained. All of the obtained non-woven fabrics were of a single layer.
　〔実施例９〕
　芯がＰＥＴであり且つ鞘（繊維表面）がＨＤＰＥであり、横断面形状が真円形状である芯鞘繊維を用いた（以下、これをＰＥＴ／ＨＤＰＥ繊維ともいう）。この繊維のポリエチレン樹脂含有量は、５０質量％であった。この繊維からなる繊維ウエブを実施例１と同様の条件にてエアスルー処理及び圧密化処理を行い、目的とする衛生用不織布を得た。得られた不織布は単一層のものであった。 [Example 9]
A core-sheath fiber having a core of PET, a sheath (fiber surface) of HDPE, and a cross-sectional shape of a perfect circle was used (hereinafter, this is also referred to as PET / HDPE fiber). The polyethylene resin content of this fiber was 50% by mass. The fiber web made of these fibers was subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric. The obtained non-woven fabric was of a single layer.
　〔実施例１０〕
　ＨＤＰＥの単一樹脂からなり、横断面形状が真円形状である繊維を用いた。以下の表１に示す坪量となるように調整した前記繊維のウエブをスパンボンド法により製造するとともに、該ウエブに対してエンボスロールによる圧密化処理を行い、スパンボンド不織布からなる衛生用不織布を得た。スパンボンド法の条件は、以下の表１に示すとおりとした。得られた不織布は単一層のものであった。 [Example 10]
A fiber made of a single resin of HDPE and having a perfect circular cross-sectional shape was used. The web of the fiber adjusted to have the basis weight shown in Table 1 below is manufactured by the spunbond method, and the web is compacted by embossing roll to obtain a sanitary nonwoven fabric made of spunbonded non-woven fabric. Obtained. The conditions of the spunbond method are as shown in Table 1 below. The obtained non-woven fabric was of a single layer.
　〔実施例１１〕
　圧密化処理を行わなかった以外は、実施例１と同様に目的とする衛生用不織布を得た。 [Example 11]
The desired sanitary non-woven fabric was obtained in the same manner as in Example 1 except that the consolidation treatment was not performed.
　〔実施例１２～１４〕
　芯がＰＰであり且つ鞘（繊維表面）がＨＤＰＥであり、横断面形状が真円形状である芯鞘繊維を用いた（以下、これをＰＰ／ＨＤＰＥ繊維ともいう）。この繊維のポリエチレン樹脂含有量は、５０質量％であった。以下の表１に示す坪量となるように調整した前記繊維のウエブを形成し、このウエブを実施例１と同様の条件にてエアスルー処理及び圧密化処理を行い、目的とする衛生用不織布を得た。得られた不織布はいずれも単一層のものであった。 [Examples 12 to 14]
A core-sheath fiber having a core of PP, a sheath (fiber surface) of HDPE, and a perfect circular cross-sectional shape was used (hereinafter, this is also referred to as PP / HDPE fiber). The polyethylene resin content of this fiber was 50% by mass. A web of the fibers adjusted to have the basis weight shown in Table 1 below is formed, and this web is subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric. Obtained. All of the obtained non-woven fabrics were of a single layer.
　〔比較例１〕
　実施例９と同様の芯鞘繊維を用いて繊維のウエブを形成し、以下の表１に示す条件でエアスルー処理を行い、目的とする衛生用不織布を得た。本比較例では、圧密化処理を行わなかった。 [Comparative Example 1]
A web of fibers was formed using the same core-sheath fibers as in Example 9, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
　〔比較例２〕
　実施例１２と同様の芯鞘繊維を用いて繊維のウエブを形成し、以下の表１に示す条件でエアスルー処理を行い、目的とする衛生用不織布を得た。本比較例では、圧密化処理を行わなかった。 [Comparative Example 2]
A web of fibers was formed using the same core-sheath fibers as in Example 12, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
　〔比較例３〕
　実施例１２と同様の芯鞘繊維を用いて繊維のウエブを形成し、以下の表１に示す条件でエアスルー処理を行い、その後、以下の表１に示す条件で非加熱にてカレンダー法による圧密化処理を行い、目的とする衛生用不織布を得た。 [Comparative Example 3]
A web of fibers is formed using the same core-sheath fibers as in Example 12, air-through treatment is performed under the conditions shown in Table 1 below, and then compaction by the calendar method is performed without heating under the conditions shown in Table 1 below. The chemical treatment was carried out to obtain the desired sanitary non-woven fabric.
〔衛生用不織布の厚みの測定〕
　実施例及び比較例の衛生用不織布について、厚みを測定した。厚みの測定は、測定対象の衛生用不織布に４．９ｍＮ／ｃｍ２の荷重を負荷した状態で、レーザー変位計を用いて、５箇所以上測定し、それらの算術平均値を厚み（ｍｍ）とする。結果を表１に示す。 [Measurement of thickness of sanitary non-woven fabric]
The thickness of the sanitary nonwoven fabrics of Examples and Comparative Examples was measured. The thickness is measured at 5 or more points using a laser displacement meter with a load of 4.9 mN / cm 2 applied to the sanitary non-woven fabric to be measured, and the arithmetic mean value thereof is defined as the thickness (mm). do. The results are shown in Table 1.
〔不織布における熱伝導率の測定〕
　実施例及び比較例の衛生用不織布について、熱伝導率の測定を以下の方法で行った。
（１．サンプル作成）
　測定対象となる衛生用不織布を小さく切って、１０ｇ程度になるように複数枚積層した積層体を２枚のＳＵＳ板間にＳＵＳ板の中央に来るように保持し、無加圧条件にて１分間加熱し、融着物を得た。加熱温度は、上述した示差走査熱量測定計で測定した融点Ｍ＋２０℃とし、複数の樹脂材料を含む不織布の場合には、融点の最も高い樹脂の融点を基準として加熱した。具体的には、ＨＤＰＥのみの繊維で構成された不織布は１５０℃、ＰＰ／ＨＤＰＥ繊維で構成された不織布は１８０℃、ＰＥＴ／ＨＤＰＥ繊維で構成された不織布は３００℃にてそれぞれ加熱した。
　次いで、得られた融着物に対して、上述の加熱温度を維持したまま、ゲージ圧２００ｋｇｆ（天板込みの総質量：２１８４８ｋｇ；圧力を面圧として計算する場合、融着物の面積が樹脂の溶融とともに変化するため、面圧は、最終的に得られた円形樹脂板の面積に基づいて計算する。例えば円形樹脂板が１５ｃｍの直径である場合、面圧は１２ＭＰａである。）の圧力をかけて１分間保持した後、加圧状態を維持したまま２０℃まで水冷して、直径約１５～２０ｃｍの円形樹脂板を得た（樹脂の溶融粘度により、得られる円形樹脂板の直径は変化しうる）。 [Measurement of thermal conductivity in non-woven fabric]
The thermal conductivity of the sanitary nonwoven fabrics of Examples and Comparative Examples was measured by the following method.
(1. Sample creation)
The sanitary non-woven fabric to be measured is cut into small pieces, and a laminated body in which a plurality of sheets are laminated so as to be about 10 g is held between the two SUS plates so as to be in the center of the SUS plates, and 1 under no pressure condition. The mixture was heated for 1 minute to obtain a fused product. The heating temperature was set to the melting point M + 20 ° C. measured by the differential scanning calorimeter described above, and in the case of a non-woven fabric containing a plurality of resin materials, the heating was performed based on the melting point of the resin having the highest melting point. Specifically, the non-woven fabric composed of HDPE-only fibers was heated at 150 ° C., the non-woven fabric composed of PP / HDPE fibers was heated at 180 ° C., and the non-woven fabric composed of PET / HDPE fibers was heated at 300 ° C.
Next, when the gauge pressure of 200 kgf (total mass including the top plate: 21848 kg; pressure is calculated as the surface pressure) of the obtained fused product while maintaining the above-mentioned heating temperature, the area of the fused product is the melting of the resin. The surface pressure is calculated based on the area of the finally obtained circular resin plate. For example, when the circular resin plate has a diameter of 15 cm, the surface pressure is 12 MPa.) After holding for 1 minute, the mixture was water-cooled to 20 ° C. while maintaining the pressurized state to obtain a circular resin plate having a diameter of about 15 to 20 cm (the diameter of the obtained circular resin plate changes depending on the melt viscosity of the resin). sell).
　続いて、得られた円形樹脂板について、中心を通る放射線状に円形樹脂板を切断し、また最大差し渡し長さが５ｃｍ以上であれば５ｃｍ以下になるように更に切断した。そして、樹脂の配向の影響がなくなるように、最大差し渡し長さにおける仮想線分の延在方向がランダムになるように、切断した樹脂板をＳＵＳ板の中央へ重ねて置いた後、厚み１ｍｍのシムをＳＵＳ板の中央から１０ｃｍの場所に２枚平行に配し、その上にＳＵＳ板を重ねた。その後、上述と同様の操作で無加圧下での加熱、並びに加圧下での加熱、冷却を行った。気泡が入ってしまった場合は、同様の動作を繰り返した。２回加熱溶融する目的は、サンプルを一度溶融させて、繊維の紡糸過程で変化する樹脂の結晶化などの影響を除外し、熱履歴を一定にするためである。これによって、フィルムを得た。 Subsequently, with respect to the obtained circular resin plate, the circular resin plate was cut radially through the center, and further cut so as to be 5 cm or less if the maximum delivery length was 5 cm or more. Then, the cut resin plates are placed on top of each other in the center of the SUS plate so that the extending directions of the virtual line segments at the maximum delivery length are random so as to eliminate the influence of the resin orientation, and then the thickness is 1 mm. Two shims were arranged in parallel at a position 10 cm from the center of the SUS plate, and the SUS plate was placed on the shims. After that, heating under no pressurization, and heating and cooling under pressurization were performed by the same operation as described above. When air bubbles entered, the same operation was repeated. The purpose of heating and melting twice is to melt the sample once, eliminate the influence of resin crystallization that changes during the fiber spinning process, and keep the thermal history constant. This gave a film.
　（２．熱伝導率の測定）
　熱伝導率の測定は、測定装置（カトーテック株式会社製、ＫＥＳ－Ｆ７　サーモラボＩＩ）を用いて、以下の方法で行った。
　まず、作成したフィルムを直径１７ｃｍの円形に切り取り、室温２３℃、相対湿度５０％の環境下に２４時間放置した。次いで、上述の測定装置及び該装置の測定マニュアルに従って、測定対象の熱伝導率を測定した。具体的には、測定用の熱源体（ＢＴ-ＢＯＸ、縦５ｃｍ×横５ｃｍで厚み１ｍｍのアルミニウム板と、ヒーターなどとが一体化されている）の温度を３３℃（測定対象の表面温度より１０℃高い温度）に設定し、フィルムが反って、接触する面積が低減することを防止するために、フィルムに面積０．２５ｍ２当たり１ｋｇの荷重を付加するように該熱源体を接触させた。測定器の表示板において、熱源体から測定対象への熱流量が一定になった時点を測定開始時点とし、該時点から６０秒間の平均熱流量を測定した。測定条件と、測定された熱流量から、以下の式（Ｉ）に基づいて算出した。フィルムの厚みＤは、レーザー変位計によって無荷重下で３箇所以上測定した厚みの算術平均値とした。上述の測定を測定対象一つにつき３回行い、それらの測定値の最大値を、サンプルの熱伝導率（Ｗ／ｍＫ）とした。結果を表１に示す。
　また参考例として、ＰＥＴのみを用いて上述の方法で製造したフィルムと、ＰＰのみを用いて上述の方法で製造したフィルムとにつき、それぞれ厚みＤ及び熱伝導率の測定を行った。この結果を、実施例及び比較例の結果と併せて表２に示す。 (2. Measurement of thermal conductivity)
The thermal conductivity was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.).
First, the prepared film was cut into a circle with a diameter of 17 cm and left to stand in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Then, the thermal conductivity of the object to be measured was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, the temperature of the heat source body for measurement (BT-BOX, an aluminum plate measuring 5 cm in length × 5 cm in width and 1 mm in thickness and a heater, etc. are integrated) is set to 33 ° C. (from the surface temperature of the object to be measured). The temperature was set to 10 ° C. higher), and the heat source body was brought into contact with the film so as to apply a load of 1 kg per 0.25 m 2 of area to prevent the film from warping and reducing the contact area. .. On the display board of the measuring instrument, the time when the heat flow rate from the heat source body to the measurement target became constant was set as the measurement start time point, and the average heat flow rate for 60 seconds from that time point was measured. It was calculated from the measurement conditions and the measured heat flow rate based on the following formula (I). The film thickness D was an arithmetic mean value of the thickness measured at three or more points under no load by a laser displacement meter. The above measurement was performed three times for each measurement target, and the maximum value of those measured values was taken as the thermal conductivity (W / mK) of the sample. The results are shown in Table 1.
As a reference example, the thickness D and the thermal conductivity of the film produced by the above method using only PET and the film produced by the above method using only PP were measured. The results are shown in Table 2 together with the results of Examples and Comparative Examples.
　ｋ＝１００×（Ｗ×Ｄ）／（Ａ×ΔＴ）　　・・・（Ｉ）
　（ｋ：熱伝導率［Ｗ／ｍＫ］、Ｗ：熱流量［Ｗ／ｍ２］、Ｄ:フィルムの厚み［ｃｍ］、Ａ:アルミニウム板面積（２５ｃｍ２）、ΔＴ：熱源体とフィルムとの温度差（１０℃）） k = 100 × (W × D) / (A × ΔT) ・ ・ ・ (I)
(K: Thermal conductivity [W / mK], W: Heat flow rate [W / m 2 ], D: Film thickness [cm], A: Aluminum plate area (25 cm 2 ), ΔT: Heat source and film Temperature difference (10 ° C))
〔体積充填率の測定〕
　実施例及び比較例の衛生用不織布について、上述の方法にて体積充填率（％）を算出した。結果を表１に示す。 [Measurement of volume filling factor]
For the sanitary nonwoven fabrics of Examples and Comparative Examples, the volume filling rate (%) was calculated by the above method. The results are shown in Table 1.
〔接触冷感ｑｍａｘの測定〕
　接触冷感ｑｍａｘは、温度センサーの付いた金属板等の熱板に熱を蓄えて該熱板の温度を測定対象より高温に設定しておき、該熱板を測定対象の表面に接触させ、その接触直後に該熱板に蓄えられた熱量が低温側の測定対象に移動する際の熱流量の最大値である。 [Measurement of cool contact feeling q max]
For the cool contact feeling q max , heat is stored in a hot plate such as a metal plate with a temperature sensor, the temperature of the hot plate is set higher than the measurement target, and the hot plate is brought into contact with the surface of the measurement target. , Is the maximum value of the heat flow rate when the amount of heat stored in the heat plate immediately after the contact moves to the measurement target on the low temperature side.
　接触冷感ｑｍａｘの測定は、測定装置（カトーテック株式会社製、ＫＥＳ－Ｆ７　サーモラボＩＩ）を用いて、以下の方法で行った。
　まず、測定対象の衛生用不織布から、長さ１０ｃｍ×幅１０ｃｍの寸法となるように試験片を切り出し、該試験片を室温２３℃、相対湿度５０％の環境下に２４時間放置した。
　次いで、この環境下で、試験片を測定台に載せ、両面テープを用いて測定台に試験片を固定した。測定台としては、気体や液体を熱媒体として用いた恒温装置を用いた。
　続いて、上述の測定装置及び該装置の測定マニュアルに従って、測定対象の接触冷感ｑｍａｘを測定した。具体的には、測定対象と接触させる熱板として、面積９．０ｃｍ２、質量９．８ｇの純銅板を用い、該銅板の初期温度を３３℃（測定対象の表面温度より１０℃高い温度）、該銅板の測定対象への接触圧を１ｋＰａとして、試験片に該銅板を接触させ、その接触の瞬間の前記熱流量の値をゼロとして、該熱流量の最大値を測定した。この測定を測定対象面につき５回行い、それら複数の測定値の算術平均値を、測定対象の接触冷感ｑｍａｘ（Ｗ／ｍ２）とした。
　接触冷感ｑｍａｘの値が大きいほど、熱の移動が速く、使用者に冷感を知覚させやすいものであることを指す。結果を以下の表１に示す。 The cool contact feeling q max was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.).
First, a test piece was cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece was left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours.
Then, in this environment, the test piece was placed on the measuring table, and the test piece was fixed to the measuring table using double-sided tape. As the measuring table, a constant temperature device using a gas or liquid as a heat medium was used.
Subsequently, the cool contact feeling q max of the measurement target was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target). The contact pressure of the copper plate to the measurement target was set to 1 kPa, the copper plate was brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact was set to zero, and the maximum value of the heat flow rate was measured. This measurement was performed 5 times for each surface to be measured, and the arithmetic mean value of the plurality of measured values was defined as the cool contact feeling q max (W / m 2 ) of the measurement target.
The larger the value of the cool contact sensation q max, the faster the heat transfer, and the easier it is for the user to perceive the cool sensation. The results are shown in Table 1 below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表１及び表２に示すように、各実施例の衛生用不織布は、比較例のものと比較して、熱伝導率及び体積充填率がともに高く、また接触冷感ｑｍａｘも高いものであることが判る。
　特に、実施例１～８に示すように、扁平異形の繊維を用いることによって、この効果が顕著となることが判る。
　したがって、本発明の衛生用不織布は、使用者の肌に触れたときに冷感を知覚させて、心地良い使用感を与えることができる。 As shown in Tables 1 and 2, the sanitary non-woven fabrics of each example have high thermal conductivity and volume filling rate, and also have a high contact cooling sensation q max, as compared with those of the comparative examples. It turns out.
In particular, as shown in Examples 1 to 8, it can be seen that this effect becomes remarkable by using flat irregularly shaped fibers.
Therefore, the sanitary nonwoven fabric of the present invention can perceive a feeling of coldness when it comes into contact with the skin of the user, and can give a comfortable feeling of use.
　〔実施例１５及び１６〕
　実施例２で用いたＨＤＰＥの単一樹脂からなるエアスルー不織布を第１繊維層とし、以下の表３に示す坪量となるように調整したＰＥＴ／ＨＤＰＥ繊維からなる単層のエアスルー不織布を第２繊維層とした。これらの繊維層を積層し接着剤によって接合して、複数の繊維層（２層）を有する繊維シートからなる衛生用不織布を得た。本実施例における第１繊維層は、実施例２の衛生用不織布と同一の構成である。 [Examples 15 and 16]
The air-through non-woven fabric made of a single resin of HDPE used in Example 2 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 2.
　〔実施例１７～２１〕
　実施例４で用いたＨＤＰＥの単一樹脂からなるエアスルー不織布を第１繊維層とし、以下の表３に示す坪量となるように調整したＰＥＴ／ＨＤＰＥ繊維からなる単層のエアスルー不織布を第２繊維層とした。これらの繊維層を積層し接着剤によって接合して、複数の繊維層（２層）を有する繊維シートからなる衛生用不織布を得た。本実施例における第１繊維層は、実施例４の衛生用不織布と同一の構成である。 [Examples 17 to 21]
The air-through non-woven fabric made of a single resin of HDPE used in Example 4 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 4.
　〔実施例２２〕
　実施例１０で用いたＨＤＰＥの単一樹脂からなるからなるエアスルー不織布を第１繊維層とし、以下の表３に示す坪量となるように調整したＰＥＴ／ＨＤＰＥ繊維からなる単層のエアスルー不織布を第２繊維層とした。これらの繊維層を積層し接着剤によって接合して、複数の繊維層（２層）を有する繊維シートからなる衛生用不織布を得た。本実施例における第１繊維層は、実施例１０の衛生用不織布と同一の構成である。 [Example 22]
The air-through non-woven fabric made of a single resin of HDPE used in Example 10 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used. It was used as the second fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 10.
〔体積充填率の測定〕
　実施例の衛生用不織布について、上述の方法と同様に体積充填率（％）を算出した。結果を以下の表３に示す。表３には、実施例２、４及び１０における衛生用不織布のみの結果を再掲する。 [Measurement of volume filling factor]
For the sanitary nonwoven fabric of the example, the volume filling rate (%) was calculated in the same manner as in the above method. The results are shown in Table 3 below. Table 3 reprints the results of only the sanitary non-woven fabrics in Examples 2, 4 and 10.
〔接触冷感ｑｍａｘの測定〕
　実施例の衛生用不織布について、上述した方法と同様に、接触冷感ｑｍａｘを測定した。実施例１５～２２については第１繊維層が配された側の面を対象として測定した。結果を表３に示す。 [Measurement of cool contact feeling q max]
For the sanitary non-woven fabric of the example, the cool contact feeling q max was measured in the same manner as in the above-mentioned method. For Examples 15 to 22, the surface on the side where the first fiber layer was arranged was measured. The results are shown in Table 3.
〔冷感の官能評価〕
　実施例２，４，１０の衛生用不織布、並びに実施例１５～２２の衛生用不織布における第１繊維層側の面を２０名の専門パネラーにそれぞれ触れさせて、以下の基準で表面に触れたときの冷感の知覚を以下の基準で評価してもらった。なお、評価に用いた衛生用不織布はそれぞれ、２３℃環境下に放置して環境温度と等しくなった状態のものを使用した。評価点の算術平均値が高いほど、衛生用不織布の冷感を効果的に知覚させやすいことを意味する。結果を以下の表３に示す。 [Sensory evaluation of cooling sensation]
The surface on the first fiber layer side of the sanitary non-woven fabrics of Examples 2, 4 and 10 and the sanitary non-woven fabrics of Examples 15 to 22 was touched by 20 specialized panelists, respectively, and the surfaces were touched according to the following criteria. We asked them to evaluate their perception of coldness based on the following criteria. The sanitary non-woven fabrics used for the evaluation were each left in an environment of 23 ° C. to be equal to the environmental temperature. The higher the arithmetic mean value of the evaluation points, the easier it is to effectively perceive the cold feeling of the sanitary non-woven fabric. The results are shown in Table 3 below.
　　５点：ｑｍａｘが０．１５以上の繊維シートと同程度に冷感が強く感じられ、冷感に非常に優れる。
　　４点：冷感を良好に知覚できる。
　　３点：冷感を知覚できる。
　　２点：冷感があまり感じられない。
　　１点：ｑｍａｘが０．０６未満のエアスルー不織布と同程度に、冷感が全く感じられない。 5 points: A feeling of coldness is as strong as that of a fiber sheet having a q max of 0.15 or more, and the feeling of coldness is very excellent.
4 points: A feeling of coldness can be perceived well.
3 points: You can perceive a feeling of coldness.
2 points: I don't feel much cold.
1 point: No feeling of coldness is felt as much as the air-through non-woven fabric having q max of less than 0.06.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３に示すように、各実施例の衛生用不織布はいずれも、体積充填率及び接触冷感ｑｍａｘがともに高く、優れた冷感を知覚させることができるものであることが判る。 As shown in Table 3, it can be seen that the sanitary non-woven fabrics of each example have a high volume filling rate and a high contact cooling sensation q max, and can perceive an excellent cooling sensation.
　また、実施例９及び比較例１の衛生用不織布について、上述の方法にて繊維表面存在率（％）を算出した。
　その結果、実施例９の繊維表面存在率は５８％であり、比較例１の表面繊維存在率は３６％であった。したがって、実施例９の繊維表面存在率は比較例１のものよりも高く、接触対象物に対する繊維の接触性を更に高めることができる。その結果、優れた冷感を知覚させることができる。 Further, for the sanitary nonwoven fabrics of Example 9 and Comparative Example 1, the fiber surface abundance rate (%) was calculated by the above method.
As a result, the fiber surface abundance rate of Example 9 was 58%, and the surface fiber abundance rate of Comparative Example 1 was 36%. Therefore, the fiber surface abundance rate of Example 9 is higher than that of Comparative Example 1, and the contact property of the fiber with respect to the contact object can be further enhanced. As a result, an excellent feeling of coldness can be perceived.
　本発明によれば、肌に触れたときに冷感を知覚させて、心地良い使用感を与える衛生用不織布並びにこれを備える衛生品及び吸収性物品が提供される。 According to the present invention, there is provided a sanitary non-woven fabric that perceives a feeling of coldness when it comes into contact with the skin and gives a comfortable feeling of use, and a hygienic product and an absorbent product provided with the non-woven fabric for hygiene.

Claims (25)

  1. 　表面の少なくとも一部がポリエチレン樹脂からなる繊維を含有し、
    　体積充填率が３．５％以上である、衛生用不織布。     At least part of the surface contains fibers made of polyethylene resin,
    A sanitary non-woven fabric having a volume filling rate of 3.5% or more.
  2. 　熱伝導率が０．１１Ｗ／ｍＫ以上である繊維を表面の少なくとも一部に含有し、
    　体積充填率が３．５％以上である、衛生用不織布。     Fibers having a thermal conductivity of 0.11 W / mK or more are contained in at least a part of the surface.
    A sanitary non-woven fabric having a volume filling rate of 3.5% or more.
  3. 　前記繊維を構成する樹脂がポリエチレン樹脂のみである、請求項１又は２に記載の衛生用不織布。 The sanitary non-woven fabric according to claim 1 or 2, wherein the resin constituting the fiber is only polyethylene resin.
  4. 　前記繊維の横断面形状は、長軸と短軸とを有し、
    　前記短軸の長さに対する前記長軸の長さの比が１．５以上１０以下である、請求項１～３のいずれか一項に記載の衛生用不織布。     The cross-sectional shape of the fiber has a major axis and a minor axis, and has a major axis and a minor axis.
    The sanitary nonwoven fabric according to any one of claims 1 to 3, wherein the ratio of the length of the major axis to the length of the minor axis is 1.5 or more and 10 or less.
  5. 　断面視において、前記繊維どうしが複数点で接触している、請求項１～４のいずれか一項に記載の衛生用不織布。 The sanitary nonwoven fabric according to any one of claims 1 to 4, wherein the fibers are in contact with each other at a plurality of points in a cross-sectional view.
  6. 　４．９ｍＮ／ｃｍ２荷重下における厚みが０．１ｍｍ以上３ｍｍ以下である、請求項１～５のいずれか一項に記載の衛生用不織布。 4.9 mN / cm The sanitary nonwoven fabric according to any one of claims 1 to 5, which has a thickness of 0.1 mm or more and 3 mm or less under a load of 2.
  7. 　坪量が１５ｇ／ｍ２以上１４０ｇ／ｍ２以下である、請求項１～６のいずれか一項に記載の衛生用不織布。 The sanitary nonwoven fabric according to any one of claims 1 to 6, wherein the basis weight is 15 g / m 2 or more and 140 g / m 2 or less.
  8. 　接触冷感ｑｍａｘが０．０６Ｗ／ｍ２以上である、請求項１～７のいずれか一項に記載の衛生用不織布。 The sanitary non-woven fabric according to any one of claims 1 to 7, wherein the cool contact feeling q max is 0.06 W / m 2 or more.
  9. 　前記衛生用不織布の表面における構成繊維の面積基準での存在割合が４０％以上である、請求項１～８のいずれか一項に記載の衛生用不織布。 The sanitary nonwoven fabric according to any one of claims 1 to 8, wherein the presence ratio of the constituent fibers on the surface of the sanitary nonwoven fabric is 40% or more based on the area.
  10. 　前記体積充填率が１０．０％以上である、請求項１～９のいずれか一項に記載の衛生用不織布。 The sanitary non-woven fabric according to any one of claims 1 to 9, wherein the volume filling rate is 10.0% or more.
  11. 　前記繊維が、該繊維の外表面及び内部がともにポリエチレン樹脂からなるか、又は
    　前記繊維が、ポリエチレン樹脂からなる低融点成分と、該低融点成分よりも融点の高い高融点成分とを含み、該低融点成分が繊維表面の少なくとも一部を長さ方向に連続して存在している複合繊維である、請求項１～１０のいずれか一項に記載の衛生用不織布。     The fiber is made of polyethylene resin both on the outer surface and inside of the fiber, or the fiber contains a low melting point component made of polyethylene resin and a high melting point component having a melting point higher than that of the low melting point component. The sanitary nonwoven fabric according to any one of claims 1 to 10, wherein the low melting point component is a composite fiber in which at least a part of the fiber surface is continuously present in the length direction.
  12. 　前記繊維がポリエチレン樹脂を含み、
    　前記繊維の全質量に対するポリエチレン樹脂の含有量が７０質量％以上１００質量％以下である、請求項１～１１のいずれか一項に記載の衛生用不織布。     The fiber contains polyethylene resin and
    The sanitary nonwoven fabric according to any one of claims 1 to 11, wherein the content of the polyethylene resin with respect to the total mass of the fibers is 70% by mass or more and 100% by mass or less.
  13. 　前記繊維がポリエチレン樹脂のみからなる、請求項１～１２のいずれか一項に記載の衛生用不織布。 The sanitary non-woven fabric according to any one of claims 1 to 12, wherein the fiber is made of only polyethylene resin.
  14. 　前記繊維が高密度ポリエチレン樹脂を含む、請求項１～１３のいずれか一項に記載の衛生用不織布。 The sanitary nonwoven fabric according to any one of claims 1 to 13, wherein the fiber contains a high-density polyethylene resin.
  15. 　前記繊維が高密度ポリエチレン樹脂のみからなる、請求項１～１４のいずれか一項に記載の衛生用不織布。 The sanitary non-woven fabric according to any one of claims 1 to 14, wherein the fiber is made of only high-density polyethylene resin.
  16. 　前記繊維の繊維径が３μｍ以上７０μｍ以下である、請求項１～１５のいずれか一項に記載の衛生用不織布。 The sanitary non-woven fabric according to any one of claims 1 to 15, wherein the fiber diameter of the fiber is 3 μm or more and 70 μm or less.
  17. 　請求項１～１６のいずれか一項に記載の衛生用不織布と、該不織布に隣接して配された第２部材とを備え、
    　前記第２部材は、９．８ｍＮ／ｃｍ２荷重下での圧縮変形量が０．３ｍｍ以上である、衛生品。     The non-woven fabric for hygiene according to any one of claims 1 to 16 and a second member arranged adjacent to the non-woven fabric are provided.
    The second member is a sanitary product having a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2.
  18. 　前記第２部材が、前記衛生用不織布とは異なる繊維集合体である、請求項１７に記載の衛生品。 The sanitary product according to claim 17, wherein the second member is a fiber aggregate different from the sanitary non-woven fabric.
  19. 　前記第２部材が吸収体である、請求項１７に記載の衛生品。 The hygienic product according to claim 17, wherein the second member is an absorber.
  20. 　吸収性物品である、請求項１７～１９のいずれか一項に記載の衛生品。 The hygienic product according to any one of claims 17 to 19, which is an absorbent article.
  21. 　前記衛生用不織布が外面に配されている、請求項１７～２０のいずれか一項に記載の衛生品。 The hygienic product according to any one of claims 17 to 20, wherein the hygienic non-woven fabric is arranged on the outer surface.
  22. 　請求項１～１６のいずれか一項に記載の衛生用不織布を備える、吸収性物品。 An absorbent article comprising the sanitary nonwoven fabric according to any one of claims 1 to 16.
  23. 　請求項１～１６のいずれか一項に記載の衛生用不織布の製造方法であって、
    　表面の少なくとも一部がポリエチレン樹脂からなる繊維のウエブにエアスルー処理を行って、繊維集合体を得て、然る後に、
    　前記繊維集合体に圧密化処理を行う、衛生用不織布の製造方法。     The method for producing a sanitary nonwoven fabric according to any one of claims 1 to 16.
    The web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which
    A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
  24. 　前記圧密化処理は、５ＭＰａ以上の面圧で又は７８．４Ｎ／ｃｍ以上の線圧で、且つ７０℃以上１２０℃以下で行う、請求項２３に記載の製造方法。 The production method according to claim 23, wherein the consolidation treatment is performed at a surface pressure of 5 MPa or more, a linear pressure of 78.4 N / cm or more, and 70 ° C. or more and 120 ° C. or less.
  25. 　前記エアスルー処理は、前記繊維表面を構成する樹脂の融点－４℃以上且つ該樹脂の融点＋４℃以下の温度の熱風を、０．６ｍ／秒以上２ｍ／秒以下の風速で前記ウエブに吹き付けて行う、請求項２３又は２４に記載の製造方法。 In the air-through treatment, hot air having a melting point of -4 ° C or higher and a melting point of the resin of + 4 ° C or lower of the resin constituting the fiber surface is blown onto the web at a wind speed of 0.6 m / sec or higher and 2 m / sec or lower. The manufacturing method according to claim 23 or 24.
PCT/JP2021/016278 2020-04-22 2021-04-22 Non-woven fabric for hygiene, hygienic product and absorbent article provided with same, and method for manufacturing non-woven fabric for hygiene WO2021215492A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180029359.XA CN115427621A (en) 2020-04-22 2021-04-22 Sanitary nonwoven fabric, sanitary product and absorbent article provided with same, and method for producing sanitary nonwoven fabric

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020076293 2020-04-22
JP2020-076293 2020-04-22

Publications (1)

Publication Number Publication Date
WO2021215492A1 true WO2021215492A1 (en) 2021-10-28

Family

ID=78269216

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/016278 WO2021215492A1 (en) 2020-04-22 2021-04-22 Non-woven fabric for hygiene, hygienic product and absorbent article provided with same, and method for manufacturing non-woven fabric for hygiene

Country Status (4)

Country Link
JP (1) JP2021175498A (en)
CN (1) CN115427621A (en)
TW (1) TW202207891A (en)
WO (1) WO2021215492A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328415A (en) * 1999-05-25 2000-11-28 Chisso Corp Nonwoven fabric made of staple fiber and absorptive article using the same
JP2013215348A (en) * 2012-04-06 2013-10-24 Oji Holdings Corp Absorbent sheet and absorbent article including the absorbent sheet
JP2014239799A (en) * 2013-06-12 2014-12-25 株式会社リブドゥコーポレーション Absorbent article
WO2017145999A1 (en) * 2016-02-22 2017-08-31 旭化成株式会社 Hydrophilic bulky nonwoven fabric
WO2019021809A1 (en) * 2017-07-28 2019-01-31 東レ株式会社 Crimped fiber, spunbonded nonwoven fabric, and method for manufacturing these
JP2019026956A (en) * 2017-07-28 2019-02-21 東レ株式会社 Crimped fiber, spunbonded non-woven fabric, and method for manufacturing crimped fiber
JP2020165011A (en) * 2019-03-28 2020-10-08 Jnc株式会社 Nonwoven fabric and absorbent article using the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106460241B (en) * 2014-04-18 2020-03-17 大和纺控股株式会社 Composite short fiber for absorbent article, method for producing same, thermally bonded nonwoven fabric for absorbent article, surface sheet for absorbent article, and absorbent article
EP3184681B1 (en) * 2014-08-20 2019-08-14 Toray Industries, Inc. A water absorption sheet for sanitary napkins comprising a non-woven fabric for sanitary materials
JP6771012B2 (en) * 2017-12-21 2020-10-21 花王株式会社 Melt blow non-woven fabric

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328415A (en) * 1999-05-25 2000-11-28 Chisso Corp Nonwoven fabric made of staple fiber and absorptive article using the same
JP2013215348A (en) * 2012-04-06 2013-10-24 Oji Holdings Corp Absorbent sheet and absorbent article including the absorbent sheet
JP2014239799A (en) * 2013-06-12 2014-12-25 株式会社リブドゥコーポレーション Absorbent article
WO2017145999A1 (en) * 2016-02-22 2017-08-31 旭化成株式会社 Hydrophilic bulky nonwoven fabric
WO2019021809A1 (en) * 2017-07-28 2019-01-31 東レ株式会社 Crimped fiber, spunbonded nonwoven fabric, and method for manufacturing these
JP2019026956A (en) * 2017-07-28 2019-02-21 東レ株式会社 Crimped fiber, spunbonded non-woven fabric, and method for manufacturing crimped fiber
JP2020165011A (en) * 2019-03-28 2020-10-08 Jnc株式会社 Nonwoven fabric and absorbent article using the same

Also Published As

Publication number Publication date
TW202207891A (en) 2022-03-01
CN115427621A (en) 2022-12-02
JP2021175498A (en) 2021-11-04

Similar Documents

Publication Publication Date Title
KR101445951B1 (en) Absorbent article comprising fluid handling zones
KR20010033290A (en) Microporous Films Having Zoned Breathability
JP6778308B2 (en) Hydrophilic bulky non-woven fabric
TWI641737B (en) Non-woven fabrics and sanitary materials
JP7124972B2 (en) Laminated nonwovens and sanitary materials
JP5775802B2 (en) Non-woven
JP2023065155A (en) Sanitary nonwoven fabric and manufacturing method therefor
JP5771518B2 (en) Non-woven
JP5211033B2 (en) Nonwoven manufacturing method
WO2021215492A1 (en) Non-woven fabric for hygiene, hygienic product and absorbent article provided with same, and method for manufacturing non-woven fabric for hygiene
JP7271801B1 (en) Method for producing nonwoven fabric, method for producing absorbent article containing nonwoven fabric produced by this as a constituent member
JP5203349B2 (en) Non-woven
JP7373985B2 (en) Surface sheet for absorbent articles
WO2023013790A1 (en) Nonwoven fabric for hygiene and method for producing same
JP2023065154A (en) Hygienic nonwoven fabric and manufacturing method thereof
JP5211032B2 (en) A method for producing a three-dimensional shaped nonwoven fabric.
JP2023065153A (en) Hygienic nonwoven fabric, absorbent article including the same and manufacturing method of the nonwoven fabric
JP2023065152A (en) Sanitary nonwoven cloth and absorptive article
JPH0369654A (en) Sheet material
JP2023019810A (en) Nonwoven fabric for absorbent article and absorbent article provided with the same
JP2023065156A (en) Laminated nonwoven fabric manufacturing method
WO2022201677A1 (en) Absorbent article
JP2022187164A (en) Nonwoven fabric, manufacturing method thereof, and absorbent article
JPWO2018186269A1 (en) Cellulose nonwoven fabric with consolidated part

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21792327

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21792327

Country of ref document: EP

Kind code of ref document: A1