WO2021131302A1 - Non-woven fabric and absorbent article - Google Patents

Non-woven fabric and absorbent article Download PDF

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Publication number
WO2021131302A1
WO2021131302A1 PCT/JP2020/040251 JP2020040251W WO2021131302A1 WO 2021131302 A1 WO2021131302 A1 WO 2021131302A1 JP 2020040251 W JP2020040251 W JP 2020040251W WO 2021131302 A1 WO2021131302 A1 WO 2021131302A1
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Prior art keywords
woven fabric
fibers
sheet
circle
fiber
Prior art date
Application number
PCT/JP2020/040251
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French (fr)
Japanese (ja)
Inventor
山口　正史
裕樹 合田
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ユニ・チャーム株式会社
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Publication of WO2021131302A1 publication Critical patent/WO2021131302A1/en

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    • 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
    • A61F13/53—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 absorbing medium
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • 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
    • D04H1/4391—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 characterised by the shape of the fibres
    • 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
    • D04H1/58—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives

Definitions

  • the present invention relates to non-woven fabrics and absorbent articles.
  • a liquid permeable sheet (top sheet, second sheet, etc.) is provided on the side of the absorbent article that the wearer or the like touches the skin (the skin side of the absorbent body).
  • High liquid permeability is required for the liquid permeable sheet, and a non-woven fabric is suitable.
  • Patent Document 1 discloses a non-woven fabric containing spiral (coil-shaped) crimp fibers.
  • the crimp fibers latent crimp fibers that develop a spiral shape by heat and actual crimp fibers that have a spiral shape from the beginning are disclosed.
  • the present invention has been made in view of the above problems, and an object of the present invention is to facilitate the permeation of a high-viscosity liquid.
  • the main invention for achieving the above object is a non-woven fabric used for an absorbent article, which contains a plurality of manifest crimp fibers, is formed of one or more of the manifest crimp fibers, and is visible from the surface.
  • S ⁇ 2 ⁇ L is satisfied when the average fiber length of the actual crimped fiber is L and the average circumference of the circle passing through the three points on the arc portion is S. It is a non-woven fabric characterized by this.
  • FIG. 10 It is a schematic perspective view of the nonwoven fabric 10 of this embodiment. It is explanatory drawing about the shape (spiral shape) of the actual crimp fiber 11. It is a figure which shows the evaluation result of the relationship between the fiber length and the number of crimps. It is a figure which shows the evaluation result of the crimp radius. It is a figure which shows the observation result of the surface of a sheet. It is a figure which shows the observation result of the cross section of a sheet. It is a comparative figure of the sheet surface of an Example and a comparative example. It is an enlarged view of the Example (No. 1) of FIG. It is a figure which shows the evaluation result of the state at the time of making into a sheet by the difference of a fiber length.
  • FIG. 11 is a schematic cross-sectional view taken along the line AA in FIG. It is the schematic perspective view which showed the top sheet 51, the second sheet 52 and the absorber 53 of the absorbent body 50 separately.
  • a non-woven fabric used for an absorbent article which contains a plurality of actual crimped fibers, is formed of one or a plurality of the manifested crimped fibers, and has a plurality of arc portions visible from the surface.
  • the non-woven fabric is characterized in that S ⁇ 2 ⁇ L is satisfied when the average fiber length of the crimped fiber is L and the average peripheral length of the circle passing through the three points on the arc portion is S.
  • the non-woven fabric further satisfies S ⁇ L.
  • a non-woven fabric According to such a non-woven fabric, a plurality of fibers are easily entangled by the adhesive. This makes it easy to form the edge of the circle.
  • At least a part of the arc portion of the non-woven fabric is composed of a plurality of the actual crimp fibers bonded to each other by the adhesive.
  • the edge of the circle can be formed more firmly.
  • the non-woven fabric has a fineness of the actual crimped fiber of less than 30 denier.
  • the non-woven fabric has a content of the actual crimped fibers larger than 80% by weight.
  • liquid permeability and cushioning property can be improved.
  • the non-woven fabric has a fiber density of 0.2 g / cm 3 or less.
  • liquid permeability can be improved.
  • the average radius of the circle is smaller than the thickness of the non-woven fabric.
  • an arc portion having a half circumference or more of a circle can be formed in the thickness direction (when the radius is equal to or larger than the thickness of the non-woven fabric, an arc portion having a half circumference or more cannot be formed in the thickness direction).
  • the area of the non-woven fabric is larger than the total area of the circular regions surrounded by the plurality of circles on the surface.
  • the absorbent article includes an absorbent body that absorbs a liquid, and a sheet member provided on the skin side of the absorbent body and having a plurality of holes penetrating in the thickness direction. It is desirable that it is arranged between the sheet member and the absorber.
  • a part of the highly viscous liquid can be transferred from the sheet member to the absorber.
  • a certain circle among the plurality of the circles overlaps at least a part with a certain hole of the sheet member, and another circle does not overlap with the hole of the sheet member. Is desirable.
  • non-woven fabric it is easy to transfer the high-viscosity liquid to the absorber due to the overlapping portion, and it is possible to suppress the reversion from the non-woven fabric to the sheet member due to the non-overlapping portion.
  • an absorbent article including an absorber that absorbs a liquid and a non-woven fabric provided on the skin side of the absorbent, and the non-woven fabric contains a plurality of actual crimp fibers and is one or more.
  • FIG. 1 is a schematic perspective view of the nonwoven fabric 10 of the present embodiment.
  • the non-woven fabric 10 of the present embodiment is a non-woven fabric used for absorbent articles such as diapers and sanitary napkins, and is particularly suitable for a second sheet of the absorbent article (a sheet arranged between the top sheet and the absorbent body). Is.
  • the non-woven fabric 10 of the present embodiment contains a plurality of crimped fibers as constituent fibers, and has high liquid permeability and cushioning properties, as will be described later.
  • the crimped fiber is a fiber having a crimped shape (zigzag shape, ⁇ shape, spiral shape, etc.), and in this embodiment, a spiral spiral crimped fiber is used.
  • a latent type spiral crimping fiber hereinafter, also referred to as a latent crimping fiber
  • an overt type spiral crimping fiber hereinafter, also referred to as an overt crimping fiber
  • the latent crimped fiber is a fiber that crimps to develop a spiral shape when heated, and it is difficult to control the development of the spiral shape. Therefore, when the non-woven fabric is formed of latent crimped fibers, the structure tends to have a uniform density (low density portions are difficult to form), and a high-viscosity liquid may not be allowed to permeate.
  • the actual crimped fiber 11 having a spiral shape is used as the crimped fiber from the beginning. That is, the non-woven fabric 10 of the present embodiment contains a plurality of actual crimp fibers 11.
  • the actual crimp fiber 11 a fiber composed of a single component (for example, polyester) is used.
  • the non-woven fabric 10 is formed of one or a plurality of actual crimp fibers 11 and has a plurality of arc portions (arc portions 12 shown in FIG. 2) that are visible from the surface.
  • FIG. 2 is an explanatory diagram of the shape (spiral shape) of the actual crimped fiber 11.
  • one fiber explicit crimp fiber 11
  • the fiber length of the actual crimped fiber 11 is L
  • the peripheral length of the circle 13 passing through the three points of the arc portion 12 is S.
  • the arc portion 12 is an arc less than half the circumference of the circle 13, and it is difficult to maintain the shape of the arc. In addition, it is difficult to form a low-density portion for allowing a high-viscosity liquid (loose stool, etc.) to permeate.
  • the actual crimped fibers 11 form an arc portion 12 having a half circumference or more of the circle 13, and the shape of the arc portion 12 can be easily maintained.
  • the non-woven fabric 10 can easily form a low-density portion due to the actual crimped fibers 11, and can easily permeate a high-viscosity liquid (loose stool or the like).
  • the arc portion 12 has at least a circular shape to form a circle 13. This makes it easier to maintain the spiral shape. However, if S is too small, the circle 13 becomes small and the liquid permeability deteriorates. Therefore, S> L / 4 or S> L / 5 is preferable.
  • the arc portion 12 (circle 13) is formed of one actual crimp fiber 11, but in the non-woven fabric 10, the arc portion 12 (circle 13) is formed of a plurality of actual crimp fibers 11. It may be formed.
  • a method for producing the non-woven fabric 10 a method in which short fibers containing the actual crimped fibers 11 are laminated by airlaid to form a web, the fibers are bonded to each other with a liquid binder (corresponding to an adhesive), and dried to form a sheet.
  • the web is not limited to the airlaid, and the web may be formed by a card machine, for example. In this case, since the texture is better than that of airlaid, a longer fiber length can be used. However, compared to the card machine, the air-laid type is more likely to maintain the spiral crimped shape during the process. Therefore, it is more preferable to form the web with airlaid.
  • the fibers are joined with a liquid binder as described above.
  • the actual crimp fibers 11 are bonded to each other with a liquid binder.
  • the plurality of actual crimp fibers 11 are easily entangled, so that the edge portion of the circle 13 is easily formed.
  • an emulsion binder such as an acrylic acid ester copolymer, an ethylene / vinyl acetate copolymer, polyvinyl alcohol (PVA), or styrene / butadiene (SBR) can be used.
  • PVA polyvinyl alcohol
  • SBR styrene / butadiene
  • an inorganic antibacterial agent in which silver ions are carried on an inorganic ion exchanger such as zirconium or zeolite, or a hydroxyl group (-OH) or amino group (-NH2) on an inorganic substance such as zirconium or silica.
  • an adjusting solution in which an inorganic deodorant having an average particle size of 0.1 to 5 ⁇ m is uniformly dispersed to the fibers it has antibacterial and deodorant properties in addition to elasticity and bulk recovery.
  • a hydrophilic non-woven fabric can be obtained.
  • the present invention is not limited to this, and other functional agents (such as a loose stool modifier) may be applied.
  • At least a part of the arc portion 12 is composed of a plurality of actual crimp fibers 11 joined by a liquid binder (adhesive). Thereby, the edge portion of the circle 13 can be formed more firmly.
  • the average fiber length of the actual crimped fiber 11 is preferably 5 to 15 mm (see Examples described later).
  • the fiber length here is the fiber length in a stretched state. If the fiber length is shorter than 5 mm, the circle 13 in the crimped state becomes smaller and the liquid permeability decreases. Further, if the fiber length is longer than 15 mm, the fibers tend to be entangled with each other, making air laying difficult (the texture cannot be removed). When the average fiber length is 5 to 15 mm, an arc portion 12 (circle 13) having an appropriate size can be formed, and a moderate texture can be realized. However, when the web is manufactured by a card machine, the fiber length may be longer than the above-mentioned fiber length because the texture is good. Specifically, when a card machine is used, the average fiber length is preferably 25 to 64 mm. In this case as well, S ⁇ 2 ⁇ L may be satisfied. In this case, S> L / 25 may be used.
  • the fineness of the manifested crimped fibers 11 is preferably less than 30 denier (33.6 dtex). More preferably, 3.6 to 8.9 denier (4 to 10 dtex) is preferable. As a result, a moderate texture can be realized.
  • the content of the actual crimp fibers 11 in the non-woven fabric 10 is preferably larger than 80% by weight. Thereby, the liquid permeability and the cushioning property can be improved.
  • the fiber density of the non-woven fabric 10 is preferably 0.2 g / cm 3 or less. Thereby, the liquid permeability can be enhanced.
  • the arc portion 12 having a half circumference or more of the circle 13 cannot be formed in the thickness direction, so that the average radius of the circle 13 may be smaller than the thickness of the non-woven fabric 10. preferable.
  • the arc portion 12 having a half circumference or more of the circle 13 can be formed in the thickness direction, and the cushioning property can be improved.
  • the central angle of the formed arc portion is 180 degrees or more, and the one having 180 degrees or more (S ⁇ 2 ⁇ L) is OK ( ⁇ ) and less than 180 degrees.
  • the thing (S> 2 ⁇ L) was regarded as NG ( ⁇ ) (see FIG. 2).
  • the central angle was automatically measured by selecting a total of three points including both ends of the arc in the measurement mode of the measuring device (VHX-7100), and it was determined whether or not the central angle was 180 degrees or more. Further, the fiber shape (number of crimps, crimp radius) of the fiber that was OK ( ⁇ ) in the judgment was evaluated.
  • FIG. 3 is a diagram showing an evaluation result of the relationship between the fiber length and the number of crimps.
  • general fibers are also shown for reference.
  • the number of crimps shown in FIG. 3 is an average value for 30 fibers that were OK in the above determination.
  • the longer the fiber length the larger the number of crimps (measured value).
  • the number of crimps per inch is almost the same value (about 6) regardless of the fiber length.
  • FIG. 4 is a diagram showing the evaluation result of the crimp radius.
  • the radius of the circle 13 the circle passing through the three points of the arc portion 12 formed by the arc portion 12 of OK was obtained by the above determination.
  • the crimp radius was measured by displaying it in the measurement mode (designated at 3 points) of the measuring device (VHX-7100).
  • the crimp radius shown in FIG. 4 is an average value for 30 fibers that were OK in the above determination, as in FIG.
  • the crimp radius is almost the same value (about 0.9 to 1 mm) regardless of the fiber length, similar to the number of crimps per inch.
  • FIG. 5 is a diagram showing the observation results of the surface of the sheet.
  • FIG. 6 is a diagram showing an observation result of a cross section of the sheet. In FIGS. 5 and 6, observation was performed at a magnification of 30 times using an electron microscope.
  • FIG. 7 is a comparative view of the sheet surfaces of Examples and Comparative Examples. FIG. 7 shows the results of observing three sheets (No1, No2, No3) for each of Examples and Comparative Examples.
  • FIG. 8 is an enlarged view of the embodiment (No. 1) of FIG. 7.
  • FIG. 8 illustrates the circle 13 formed by the overt crimp fibers.
  • a plurality of circles 13 are formed on the surface of the embodiment by one or a plurality of actual crimped fibers.
  • the circular region R surrounded by these circles 13 is a low-density portion where the fiber density is low.
  • the circles as in the embodiment are not formed, and the fibers are arranged substantially evenly (see FIGS. 5 and 7).
  • more low-density portions are formed than in the comparative examples, and it is easier for the liquid having a higher viscosity to permeate than in the comparative examples.
  • FIG. 6 in the embodiment, since the arc is formed in the thickness direction as well, the thickness is larger than that in the comparative example, and the cushioning property is improved.
  • the average radius of the plurality of circles 13 shown in FIG. 8 was 0.73 mm, and the average circumference of the circle 13 was 4.58 mm. Since the fiber length of the actual crimped fiber is 5 mm, S ⁇ 2 ⁇ L is satisfied.
  • the average circumference is a region where 10 or more arcs due to the apparent crimped fibers are visually recognized (rectangular region with a long side of about 16 mm and a short side of about 12 mm in FIG. 8), and 10 or more circles 13 are formed. It is obtained by extracting and averaging the circumferences of each of the circles 13.
  • the average perimeter is equal to the perimeter of the circle formed by the average radius of the extracted circle 13 (the average perimeter can be obtained from the average radius).
  • a plurality of circles 13 are formed in each of No. 2 and No. 3 of the embodiment (not shown), the average radius of the circle 13 in No. 2 is 0.82 mm, and the average of the circle 13 in No. 3 is 0.82 mm. The radius was 0.83 mm. Since the average circumference of the circle 13 in No. 2 is 5.02 mm and the average circumference of the circle 13 in No. 3 is 5.21 mm, both satisfy S ⁇ 2 ⁇ L.
  • the area other than the circle area R is larger than the total area of the circle areas R surrounded by the plurality of circles 13. As a result, it is possible to obtain an appropriate liquid permeability (in the opposite case, the liquid may become too faint and the liquid may be permeated too much).
  • FIG. 9 is a diagram showing an evaluation result of a state at the time of sheet formation due to a difference in fiber length.
  • three sheets were prepared (No1, No2, No3) using actual crimped fibers having fiber lengths of 5 mm, 10 mm, 15 mm, and 20 mm, and the sheet surface was observed.
  • the fiber length is preferably 5 to 15 mm.
  • FIG. 10 is a schematic perspective view of the diaper 1 as viewed from the ventral side.
  • FIG. 11 is a plan view of the diaper 1 in an unfolded and extended state.
  • FIG. 12 is a schematic cross-sectional view taken along the line AA in FIG.
  • the "extended state" in FIG. 11 refers to a state in which the product (diaper 1) is extended without wrinkles, specifically, the dimensions of each member (for example, the front body portion 30 to be described later) constituting the diaper 1. Refers to a state in which is extended until the length of the member is equal to or close to the size of the member alone.
  • FIG. 13 is a schematic perspective view showing the top sheet 51, the second sheet 52, and the absorber 53 of the absorbent main body 50 separately.
  • the diaper 1 has a vertical direction, a horizontal direction (also referred to as a width direction), and a front-rear direction as three directions orthogonal to each other in the pants-shaped state shown in FIG.
  • the side that becomes the wearer's torso side is referred to as the "upper side”
  • the side that becomes the wearer's inseam side is referred to as the "lower side”.
  • the ventral side of the wearer is referred to as the "front side”
  • the dorsal side of the wearer is referred to as the "posterior side”.
  • the right side when the diaper 1 is viewed from the front side is defined as the "right side”
  • the left side is defined as the "left side”.
  • the diaper 1 has a longitudinal direction, a left-right direction, and a thickness direction as three directions orthogonal to each other.
  • the left-right direction (width direction) in the unfolded state is the same direction as the left-right direction in the pants-type state (FIG. 10).
  • the longitudinal direction in the unfolded state is a direction along the vertical direction in the pants-shaped state.
  • the side that comes into contact with the skin of the wearer (wearer) is defined as the "skin side".
  • the opposite side is the "non-skin side”.
  • the diaper 1 of the present embodiment has an inseam exterior portion 20, a front body portion 30, a rear body portion 40, and an absorbent main body 50.
  • the inseam exterior portion 20, the front body portion 30, and the rear body portion 40 correspond to the exterior members and are joined to the absorbent main body 50.
  • these exterior members constitute a ventral waist circumference portion 1A, a crotch portion 1B, and a dorsal waist circumference portion 1C.
  • the exterior member is composed of three members (inseam exterior portion 20, front body portion 30, and rear body portion 40), but the present invention is not limited to this.
  • the inseam exterior portion 20, the front body portion 30, and the rear body portion 40 may be one member. Further, the inseam exterior portion 20 may not be provided.
  • the inseam exterior portion 20 is a portion located in the inseam of the wearer when the diaper 1 is worn (a portion forming a part of the crotch portion 1B).
  • the inseam exterior portion 20 is formed of a spunbonded non-woven fabric or the like.
  • the front body portion 30 is a portion located around the ventral waist of the wearer when the diaper 1 is worn (mainly a portion constituting the ventral waist circumference 1A).
  • the front body portion 30 has a ventral inner layer sheet 31 and a ventral outer layer sheet 33 stacked in the thickness direction.
  • the ventral inner layer sheet 31 is arranged on the skin side in the thickness direction
  • the ventral outer layer sheet 33 is arranged on the non-skin side in the thickness direction.
  • the upper end of the ventral outer layer sheet 33 projects upward from the upper end of the ventral inner layer sheet 31, and the protruding portion is located below the skin side in the thickness direction at the position of the upper end 30 eu of the front body portion 30.
  • the upper end edge of the front body portion 30 (that is, the waist circumference opening BH) is less likely to bite into the wearer's skin when the diaper 1 is worn, and the ventral waist circumference portion It is possible to reduce the discomfort in 1A.
  • an elastic member such as rubber thread is provided between the ventral inner layer sheet 31 and the ventral outer layer sheet 33 in the thickness direction.
  • a plurality of ventral waist elastic members 34 are provided in the region between the right end portion and the left end portion in the left-right direction of the front body portion 30. ..
  • the plurality of ventral waist elastic members 34 are sandwiched between the ventral inner layer sheet 31 and the ventral outer layer sheet 33 in a state of being vertically spaced and laterally extended at a predetermined extension ratio. It is joined.
  • the ventral waistline elastic member 34 provided in this way imparts elasticity in the width direction to the front body portion 30 of the diaper 1.
  • a plurality of waist elastic members 35 are similarly provided at intervals in the vertical direction in the region along the edge of the waist circumference opening BH of the front body portion 30.
  • the back body portion 40 is a portion (mainly a portion constituting the dorsal waist circumference portion 1C) located around the dorsal waist circumference of the wearer when the diaper 1 is worn.
  • the structure of the back body portion 40 is substantially the same as that of the front body portion 30. That is, the back body portion 40 has a dorsal inner layer sheet 41 and a dorsal outer layer sheet 43 stacked in the thickness direction.
  • the upper end of the dorsal outer layer sheet 43 projects upward from the upper end of the dorsal inner layer sheet 41, and the protruding portion is located below the skin side in the thickness direction at the position of the upper end 40eu of the back body portion 40. It is folded back to form a folded-back portion 43f.
  • the upper end edge (girth opening BH) of the back body portion 40 is less likely to bite into the wearer's skin, and discomfort in the dorsal waist circumference portion 1C can be less likely to occur.
  • a plurality of dorsal waist circumference elastic members 44 are provided in the region between the right end portion and the left end portion in the left-right direction of the back body portion 40.
  • the plurality of dorsal waist elastic members 44 are sandwiched between the dorsal inner layer sheet 41 and the dorsal outer layer sheet 43 in a state of being vertically spaced and extended in the left and right directions at a predetermined extension ratio. Is joined.
  • the dorsal waistline elastic member 44 imparts elasticity in the width direction to the back body portion 40 of the diaper 1.
  • a plurality of waist elastic members 45 are similarly provided at intervals in the vertical direction in a region along the edge of the waist circumference opening BH of the rear body portion 40. The intervals between the dorsal elastic members 44 adjacent to each other in the vertical direction and the intervals between the waist elastic members 45 are the same as the intervals between the ventral elastic members 34 and the intervals between the waist elastic members 35, respectively.
  • a plurality of leg circumference elastic members 36, 46 such as thread rubber are provided in the regions along the edges of the pair of leg circumference openings HL of the front body portion 30 and the rear body portion 40, respectively. ing.
  • the plurality of elastic members around the legs 36, 46 are attached in an extended state between the ventral inner layer sheet 31 and the ventral outer layer sheet 33, and between the dorsal inner layer sheet 41 and the dorsal outer layer sheet 43. Therefore, the front body portion 30 and the back body portion 40 fit around the legs of the wearer.
  • the absorbent main body 50 has a function of absorbing excrement such as urine, has a substantially rectangular shape in a plan view as shown in FIG. 11, and has its longitudinal direction along the vertical direction of the diaper 1 in the center of the horizontal direction. Have been placed. Details of the absorbent body 50 will be described later.
  • the absorbent main body 50 is folded in half with the predetermined position CL in the longitudinal direction (vertical direction) of the absorbent main body 50 as a folding position, and the absorbent main body 50 is folded in half.
  • the front body portion 30 and the rear body portion 40 facing each other are joined by welding or the like at the ventral side joint portion 30es and the dorsal side joint portion 40es.
  • the front body portion 30 and the rear body portion 40 are connected in an annular shape to form a pants-type diaper 1 in which a waist opening BH and a pair of leg openings LH and LH are formed as shown in FIG.
  • the absorbent main body 50 has a function of absorbing excrement (liquid) such as urine.
  • the absorbent main body 50 has the top sheet 51, which is at least partially permeable to liquid, in order from the skin side (the side in contact with the wearer) in the thickness direction. It has a liquid-permeable second sheet 52 (nonwoven fabric 10), an absorber 53, and a liquid-impermeable back sheet 54.
  • the top sheet 51 (corresponding to a sheet member) is, for example, a non-woven fabric, and a plurality of holes 51a penetrating in the thickness direction are formed.
  • a spunlace non-woven fabric formed of cellulose fibers such as rayon, synthetic resin fibers, or the like
  • an air-through non-woven fabric formed of the synthetic resin fibers, or the like can be used.
  • the top sheet 51 of the present embodiment is formed of fibers having a finer fineness than the actual crimped fibers 11 of the second sheet 52.
  • the non-woven fabric is not limited to the non-woven fabric, and a resin film having a large number of liquid permeation holes formed therein, a net-like sheet having a large number of meshes, and the like may be used.
  • a resin film having a large number of liquid permeation holes formed therein, a net-like sheet having a large number of meshes, and the like may be used.
  • the material of the resin film and the net-like sheet include polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET) and the like.
  • the holes 51a can be formed by using, for example, a heated pin member (not shown). ..
  • a through hole can be formed in the sheet by using a pair of upper and lower dies including an upper die in which a plurality of pin members are arranged and a lower die in which a plurality of holes are arranged. That is, by inserting each pin member of the upper mold into each hole of the lower mold, a through hole (hole 51a) is formed in the sheet (here, the top sheet 51) sandwiched between the upper mold and the lower mold.
  • the hole diameter and arrangement of the holes 51a formed in the top sheet 51 can be adjusted by the thickness and arrangement of the pin members of the upper mold, respectively.
  • the arrangement of the holes 51a is not particularly limited, such as staggered, grid-like, and wavy.
  • the shape of the hole 51a is a round shape, but the shape is not limited to this, and may be, for example, an elliptical shape or a square shape.
  • the back sheet 54 is a liquid impermeable sheet, and a material capable of preventing the liquid (excrement, etc.) absorbed by the absorber 53 from leaking to the outside is used. Further, by using a breathable material, it is possible to reduce stuffiness at the time of wearing, and it is possible to reduce discomfort at the time of wearing.
  • a material for example, a composite in which a liquid-impermeable film mainly composed of polyethylene (PE), polypropylene (PP) or the like, a liquid-impermeable film, a breathable film, a spunbond or the like is laminated on one side of a non-woven fabric.
  • a non-woven fabric examples include sheets.
  • a hydrophobic non-woven fabric, an impermeable plastic film, a laminated sheet of the non-woven fabric and the impermeable plastic film and the like can be used.
  • an SMS non-woven fabric in which a melt-blown non-woven fabric having high water resistance is sandwiched between spunbonded non-woven fabrics having high strength may be used.
  • the absorber 53 is a member having a function of absorbing excrement (liquid) and holding it inside. It is preferable that the absorber 53 is bulky, does not easily lose its shape, and has little chemical irritation.
  • an absorber material composed of fluffy pulp or air-laid non-woven fabric and a highly absorbent polymer can be exemplified.
  • Examples of the fluffy pulp include chemical pulp, cellulose fibers, rayon, acetate and other artificial cellulose fibers.
  • Examples of the air-laid non-woven fabric include those obtained by heat-sealing pulp and synthetic fibers or those fixed with a binder.
  • Examples of the highly absorbent polymer (SAP) include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers.
  • the shape and structure of the absorber 53 can be changed as needed, but the total absorption amount of the absorber 53 needs to correspond to the design insertion amount as an absorbent article and the desired application.
  • the size and absorption capacity of the absorber 53 vary depending on the application.
  • the absorber 53 of the present embodiment has a two-layer structure, and includes an upper layer core 53a and a lower layer core 53b arranged on the non-skin side in the thickness direction of the upper layer core 53a.
  • the present invention is not limited to this, and the absorber 53 may have a one-layer structure. Further, the absorber 53 may be coated with a liquid permeable sheet such as tissue.
  • a second sheet 52 made of the non-woven fabric 10 of the present embodiment is provided between the top sheet 51 and the absorber 53 (that is, on the skin side of the absorber 53).
  • the second sheet 52 is a sheet that plays a role of improving absorption due to a density gradient with the top sheet 51, preventing excrement from returning, and improving cushioning.
  • the second sheet 52 (nonwoven fabric 10) of the present embodiment has a low-density portion formed by the actual crimp fibers 11, so that a part of the high-viscosity liquid can be easily transferred from the top sheet 51 to the absorber 53. ..
  • a plurality of holes 51a are provided in the top sheet 51, and a plurality of circles 13 formed by one or a plurality of actual crimp fibers 11 are provided in the second sheet 52.
  • the holes 51a and the circle 13 have substantially the same size.
  • the holes 51a of the top sheet 51 are formed in a predetermined arrangement (pattern), while the circles 13 of the second sheet 52 are randomly formed. Therefore, there are a portion where the hole 51a and the circle 13 overlap each other and a portion where the hole 51a and the circle 13 do not overlap each other.
  • one of the plurality of circles 13 of the second sheet 52 overlaps at least a part of a certain hole 51a of the top sheet 51, and another circle 13 overlaps with the hole 51a of the top sheet 51. It does not overlap.
  • the presence of the portion where the circle 13 and the hole 51a overlap each other facilitates the transfer of the highly viscous liquid to the absorber 53. Further, since there is a non-overlapping portion, it is possible to suppress the reversion from the second seat 52 to the top seat 51.
  • the non-woven fabric 10 of the present embodiment easily allows a high-viscosity liquid such as loose stool to permeate. Therefore, by applying it to the second sheet 52 of the diaper 1, a part of the high-viscosity liquid can be applied to the top sheet 51. Can be easily transferred to the absorber 53.
  • the manifest crimp fibers 11 are formed of a single component (for example, PET), but the present invention is not limited to this, and for example, the material may be formed of two components.
  • the diaper 1 of the above-described embodiment is provided with two sheets (top sheet 51 and second sheet 52) on the skin side of the absorber 53, and the non-woven fabric 10 is used for the second sheet 52, but the present invention is limited to this. Absent. For example, there may be only one sheet on the skin side of the absorber 53. In this case, the non-woven fabric 10 may be used for the sheet.
  • Pants-type disposable diaper 1A Ventral girth 1B Crotch 1C Dorsal girth 10 Non-woven fabric 11 Overt crimp fiber 12 Arc 13 Yen 20 Inseam exterior 30 Front body 30es Ventral side joint 30eu Upper end 31 Ventral inner layer sheet 33 Seat 33f Folded part 34 Ventral elastic member 35 Waist elastic member 36 Leg elastic member 40 Back body part 40es Back side joint 40 eu Upper end 41 Back inner layer sheet 43 Back outer layer sheet 43f Folded part 44 Back waist elastic member 45 Waist elastic member 46 Leg circumference elastic member 50 Absorbent body 51 Top sheet (seat member) 51a Hole 52 Second sheet (nonwoven fabric) 53 Absorbent 53a Upper core 53b Lower core 54 Back seat BH Girth opening LH Leg opening

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Abstract

A non-woven fabric (10) which is to be used in an absorbent article (1), contains a plurality of obviously crimped fibers (11), and has a plurality of arc-shaped sections (12) which are visible from the surface and are formed from one or more of the obviously crimped fibers (11), the non-woven fabric (10) being characterized in that S≤2×L is satisfied if the average fiber length of the obviously crimped fibers (11) is L and the average circumference of a circle (13) which passes through three points on the arc-shaped sections (12) is S.

Description

不織布、及び、吸収性物品Non-woven fabric and absorbent articles
　本発明は、不織布、及び、吸収性物品に関する。 The present invention relates to non-woven fabrics and absorbent articles.
　従来、吸収性物品として生理用ナプキンや使い捨ておむつが使用されている。吸収性物品において着用者等の肌が当たる側（吸収体よりも肌側）には、液透過性シート（トップシート、セカンドシート等）が設けられている。液透過性シートには、高い液透過性が求められており、不織布が好適とされている。 Conventionally, sanitary napkins and disposable diapers have been used as absorbent articles. A liquid permeable sheet (top sheet, second sheet, etc.) is provided on the side of the absorbent article that the wearer or the like touches the skin (the skin side of the absorbent body). High liquid permeability is required for the liquid permeable sheet, and a non-woven fabric is suitable.
　このような不織布として、例えば特許文献１には、螺旋状（コイル状）の捲縮繊維を含んだものが開示されている。捲縮繊維としては、熱によって螺旋状を発現する潜在捲縮繊維や最初から螺旋状を有する顕在捲縮繊維が開示されている。 As such a non-woven fabric, for example, Patent Document 1 discloses a non-woven fabric containing spiral (coil-shaped) crimp fibers. As the crimp fibers, latent crimp fibers that develop a spiral shape by heat and actual crimp fibers that have a spiral shape from the beginning are disclosed.
特開２００２－２８５４６４号公報JP-A-2002-285464
　しかし、潜在捲縮繊維を用いる場合、熱処理によって繊維を捲縮させるため、収縮度合を制御することが難しく、大きい螺旋捲縮の形状の状態で留めることが難しい。このため、高粘度液体（軟便等）の透過のための低密度部を意図的に形成することが困難であった。顕在捲縮繊維を用いる場合においても、複数の繊維が積層されて不織布になった状態では高粘度液体の透過のための低密度部を意図的に形成できないおそれがあった。 However, when latent crimped fibers are used, the fibers are crimped by heat treatment, so it is difficult to control the degree of shrinkage and it is difficult to keep them in the shape of a large spiral crimp. For this reason, it has been difficult to intentionally form a low-density portion for permeation of a high-viscosity liquid (loose stool or the like). Even when the actual crimped fibers are used, there is a possibility that a low density portion for permeation of a high-viscosity liquid cannot be intentionally formed in a state where a plurality of fibers are laminated to form a non-woven fabric.
　本発明は、上記のような問題に鑑みてなされたものであって、高粘度の液体を透過させやすくすることを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to facilitate the permeation of a high-viscosity liquid.
　上記目的を達成するための主たる発明は、吸収性物品に用いられる不織布であって、複数の顕在捲縮繊維を含み、１本又は複数本の前記顕在捲縮繊維で形成され、表面から視認可能な円弧部を、複数有し、前記顕在捲縮繊維の平均繊維長をＬとし、前記円弧部上の三つの点を通る円の平均周長をＳとしたとき、Ｓ≦２×Ｌを満たすことを特徴とする不織布である。 The main invention for achieving the above object is a non-woven fabric used for an absorbent article, which contains a plurality of manifest crimp fibers, is formed of one or more of the manifest crimp fibers, and is visible from the surface. S ≦ 2 × L is satisfied when the average fiber length of the actual crimped fiber is L and the average circumference of the circle passing through the three points on the arc portion is S. It is a non-woven fabric characterized by this.
　本発明の他の特徴については、本明細書及び添付図面の記載により明らかにする。 Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.
　本発明によれば、高粘度の液体を透過させやすくすることができる。 According to the present invention, it is possible to easily allow a high-viscosity liquid to permeate.
本実施形態の不織布１０の概略斜視図である。It is a schematic perspective view of the nonwoven fabric 10 of this embodiment. 顕在捲縮繊維１１の形状（螺旋形状）についての説明図である。It is explanatory drawing about the shape (spiral shape) of the actual crimp fiber 11. 繊維長と捲縮数の関係の評価結果を示す図である。It is a figure which shows the evaluation result of the relationship between the fiber length and the number of crimps. 捲縮半径の評価結果を示す図である。It is a figure which shows the evaluation result of the crimp radius. シートの表面の観察結果を示す図である。It is a figure which shows the observation result of the surface of a sheet. シートの断面の観察結果を示す図である。It is a figure which shows the observation result of the cross section of a sheet. 実施例と比較例のシート表面の比較図である。It is a comparative figure of the sheet surface of an Example and a comparative example. 図７の実施例（Ｎｏ１）の拡大図である。It is an enlarged view of the Example (No. 1) of FIG. 繊維長の違いによるシート化時の状態の評価結果を示す図である。It is a figure which shows the evaluation result of the state at the time of making into a sheet by the difference of a fiber length. おむつ１を腹側から見た概略斜視図である。It is a schematic perspective view which looked at the diaper 1 from the ventral side. 展開且つ伸長状態であるおむつ１の平面図である。It is a top view of the diaper 1 which is unfolded and extended. 図１１中のＡ－Ａ概略断面図である。FIG. 11 is a schematic cross-sectional view taken along the line AA in FIG. 吸収性本体５０のトップシート５１とセカンドシート５２と吸収体５３を分離して示した概略斜視図である。It is the schematic perspective view which showed the top sheet 51, the second sheet 52 and the absorber 53 of the absorbent body 50 separately.
　本明細書及び添付図面の記載により、少なくとも以下の事項が明らかとなる。 At least the following matters will be clarified by the description in this specification and the attached drawings.
　吸収性物品に用いられる不織布であって、複数の顕在捲縮繊維を含み、１本又は複数本の前記顕在捲縮繊維で形成され、表面から視認可能な円弧部を、複数有し、前記顕在捲縮繊維の平均繊維長をＬとし、前記円弧部上の三つの点を通る円の平均周長をＳとしたとき、Ｓ≦２×Ｌを満たすことを特徴とする不織布である。 A non-woven fabric used for an absorbent article, which contains a plurality of actual crimped fibers, is formed of one or a plurality of the manifested crimped fibers, and has a plurality of arc portions visible from the surface. The non-woven fabric is characterized in that S ≦ 2 × L is satisfied when the average fiber length of the crimped fiber is L and the average peripheral length of the circle passing through the three points on the arc portion is S.
　このような不織布によれば、円の半周以上の円弧が形成されることになり、円弧の形を維持しやすい。これにより、顕在捲縮繊維に起因した低密度部が形成されるので、高粘度の液体（軟便等）を透過させやすくすることができる。 According to such a non-woven fabric, an arc of more than half a circumference of a circle is formed, and it is easy to maintain the shape of the arc. As a result, a low-density portion due to the apparent crimped fibers is formed, so that a highly viscous liquid (loose stool or the like) can be easily permeated.
　かかる不織布であって、Ｓ≦Ｌをさらに満たすことが望ましい。 It is desirable that the non-woven fabric further satisfies S ≦ L.
　このような不織布によれば、円が形成されることで、形状をより維持しやすくなる。 According to such a non-woven fabric, it becomes easier to maintain the shape by forming a circle.
　かかる不織布であって、前記顕在捲縮繊維同士が、接着剤により接合されていることが望ましい。 In such a non-woven fabric, it is desirable that the actual crimp fibers are bonded to each other with an adhesive.
　このような不織布によれば、接着剤によって複数本の繊維が絡まりやすい。これにより円の縁部を形成しやすい。 According to such a non-woven fabric, a plurality of fibers are easily entangled by the adhesive. This makes it easy to form the edge of the circle.
　かかる不織布であって、前記円弧部の少なくとも一部は、前記接着剤により互いに接合された複数の前記顕在捲縮繊維により構成されていることが望ましい。 It is desirable that at least a part of the arc portion of the non-woven fabric is composed of a plurality of the actual crimp fibers bonded to each other by the adhesive.
　このような不織布によれば、円の縁部をよりしっかり形成することができる。 According to such a non-woven fabric, the edge of the circle can be formed more firmly.
　かかる不織布であって、前記顕在捲縮繊維の繊度が３０デニール未満であることが望ましい。 It is desirable that the non-woven fabric has a fineness of the actual crimped fiber of less than 30 denier.
　このような不織布によれば、ほどよい地合いを実現できる（繊度が大きすぎると本数が少なくなり地合いが取れなくなる）。 With such a non-woven fabric, a moderate texture can be achieved (if the fineness is too large, the number of fabrics will decrease and the texture will not be removed).
　かかる不織布であって、前記顕在捲縮繊維の含有量が８０重量％よりも大きいことが望ましい。 It is desirable that the non-woven fabric has a content of the actual crimped fibers larger than 80% by weight.
　このような不織布によれば、液透過性及びクッション性を高めることができる。 According to such a non-woven fabric, liquid permeability and cushioning property can be improved.
　かかる不織布であって、繊維密度が０．２ｇ／ｃｍ3以下であることが望ましい。 It is desirable that the non-woven fabric has a fiber density of 0.2 g / cm 3 or less.
　このような不織布によれば、液透過性を高めることができる。 With such a non-woven fabric, liquid permeability can be improved.
　かかる不織布であって、前記円の平均半径は、前記不織布の厚さよりも小さいことが望ましい。 In such a non-woven fabric, it is desirable that the average radius of the circle is smaller than the thickness of the non-woven fabric.
　このような不織布によれば、厚さ方向において、円の半周以上の円弧部を形成できる（半径が不織布の厚さ以上の場合、厚さ方向に半周以上の円弧部を形成できない）。 According to such a non-woven fabric, an arc portion having a half circumference or more of a circle can be formed in the thickness direction (when the radius is equal to or larger than the thickness of the non-woven fabric, an arc portion having a half circumference or more cannot be formed in the thickness direction).
　かかる不織布であって、前記表面において、複数の前記円で囲まれる円領域の合計面積よりも、前記円領域以外の領域の面積の方が広いことが望ましい。 It is desirable that the area of the non-woven fabric is larger than the total area of the circular regions surrounded by the plurality of circles on the surface.
　このような不織布によれば、適度な透過性にすることができる（すかすかになり過ぎないようにできる）。 With such a non-woven fabric, it is possible to make it moderately permeable (it can be prevented from becoming too faint).
　かかる不織布であって、前記吸収性物品は、液体を吸収する吸収体と、前記吸収体よりも肌側に設けられ、厚さ方向に貫通する孔を複数有するシート部材と、を備えており、前記シート部材と前記吸収体との間に配置されていることが望ましい。 In such a non-woven fabric, the absorbent article includes an absorbent body that absorbs a liquid, and a sheet member provided on the skin side of the absorbent body and having a plurality of holes penetrating in the thickness direction. It is desirable that it is arranged between the sheet member and the absorber.
　このような不織布によれば、シート部材から吸収体へ高粘度の液体の一部を移行させることができる。 According to such a non-woven fabric, a part of the highly viscous liquid can be transferred from the sheet member to the absorber.
　かかる不織布であって、複数の前記円のうちの或る円は、前記シート部材の或る孔と少なくとも一部が重なっており、別の円は、前記シート部材の前記孔と重なっていないことが望ましい。 In such a non-woven fabric, a certain circle among the plurality of the circles overlaps at least a part with a certain hole of the sheet member, and another circle does not overlap with the hole of the sheet member. Is desirable.
　このような不織布によれば、重なっている部位があることにより高粘度の液体を吸収体へ移行させやすくなり、また、重ならない部位があることにより不織布からシート部材への逆戻りを抑制できる。 According to such a non-woven fabric, it is easy to transfer the high-viscosity liquid to the absorber due to the overlapping portion, and it is possible to suppress the reversion from the non-woven fabric to the sheet member due to the non-overlapping portion.
　また、液体を吸収する吸収体と、前記吸収体よりも肌側に設けられた不織布と、を備えた吸収性物品であって、前記不織布は、複数の顕在捲縮繊維を含み、１本又は複数本の前記顕在捲縮繊維で形成され、表面から視認可能な円弧部を、複数有し、前記顕在捲縮繊維の平均繊維長をＬとし、前記円弧部上の三つの点を通る円の平均周長をＳとしたとき、Ｓ≦２×Ｌを満たすことを特徴とする吸収性物品である。 Further, it is an absorbent article including an absorber that absorbs a liquid and a non-woven fabric provided on the skin side of the absorbent, and the non-woven fabric contains a plurality of actual crimp fibers and is one or more. A circle formed of a plurality of the manifested crimped fibers and having a plurality of arc portions visible from the surface, the average fiber length of the manifested crimped fibers being L, and passing through three points on the arc portion. It is an absorbent article characterized by satisfying S ≦ 2 × L when the average peripheral length is S.
　このような吸収性物品によれば、高粘度の液体（軟便等）を吸収体へと透過させやすくすることができる。 According to such an absorbent article, it is possible to easily allow a highly viscous liquid (loose stool, etc.) to permeate through the absorber.
＝＝＝実施形態＝＝＝
＜＜不織布について＞＞
　図１は、本実施形態の不織布１０の概略斜視図である。 === Embodiment ===
<< About non-woven fabric >>
FIG. 1 is a schematic perspective view of the nonwoven fabric 10 of the present embodiment.
　本実施形態の不織布１０は、おむつや生理用ナプキンなどの吸収性物品に用いられる不織布であり、特に、吸収性物品のセカンドシート（トップシートと吸収体との間に配置されるシート）に好適である。 The non-woven fabric 10 of the present embodiment is a non-woven fabric used for absorbent articles such as diapers and sanitary napkins, and is particularly suitable for a second sheet of the absorbent article (a sheet arranged between the top sheet and the absorbent body). Is.
　このような吸収性物品では、液体の透過性が良いことが要求される。特に、おむつの場合、粘度の高い液体（軟便等）を透過させることが要求されることがある。そこで、本実施形態の不織布１０は、構成繊維として複数の捲縮繊維を含んでおり、後述するように、高い液透過性とクッション性を備えている。 Such absorbent articles are required to have good liquid permeability. In particular, in the case of diapers, it may be required to allow a highly viscous liquid (such as loose stool) to permeate. Therefore, the non-woven fabric 10 of the present embodiment contains a plurality of crimped fibers as constituent fibers, and has high liquid permeability and cushioning properties, as will be described later.
　捲縮繊維とは捲縮形状（ジグザグ状、Ω状、螺旋状など）を有する繊維であり、本実施形態では、螺旋状の螺旋捲縮繊維を用いている。また、螺旋捲縮繊維として、潜在型の螺旋捲縮繊維（以下、潜在捲縮繊維ともいう）と、顕在型の螺旋捲縮繊維（以下、顕在捲縮繊維ともいう）が知られている。潜在捲縮繊維は、加熱することにより捲縮して螺旋形状を発現する繊維であり、螺旋形状の発現を制御することが難しい。このため、潜在捲縮繊維で不織布を形成すると、一様な密度の構造となりやすく（低密度部ができにくく）、高粘度の液体を透過させることが出来ないおそれがある。 The crimped fiber is a fiber having a crimped shape (zigzag shape, Ω shape, spiral shape, etc.), and in this embodiment, a spiral spiral crimped fiber is used. Further, as the spiral crimping fiber, a latent type spiral crimping fiber (hereinafter, also referred to as a latent crimping fiber) and an overt type spiral crimping fiber (hereinafter, also referred to as an overt crimping fiber) are known. The latent crimped fiber is a fiber that crimps to develop a spiral shape when heated, and it is difficult to control the development of the spiral shape. Therefore, when the non-woven fabric is formed of latent crimped fibers, the structure tends to have a uniform density (low density portions are difficult to form), and a high-viscosity liquid may not be allowed to permeate.
　そこで本実施形態の不織布１０では、捲縮繊維として、最初から螺旋状を有する顕在捲縮繊維１１を用いている。すなわち、本実施形態の不織布１０は、複数の顕在捲縮繊維１１を含んでいる。本実施形態では、顕在捲縮繊維１１として、単一成分（例えばポリエステル）で構成された繊維を用いている。また、不織布１０は、１本又は複数本の顕在捲縮繊維１１で形成され、表面から視認可能な円弧部（図２に示す円弧部１２）を、複数有している。 Therefore, in the non-woven fabric 10 of the present embodiment, the actual crimped fiber 11 having a spiral shape is used as the crimped fiber from the beginning. That is, the non-woven fabric 10 of the present embodiment contains a plurality of actual crimp fibers 11. In this embodiment, as the actual crimp fiber 11, a fiber composed of a single component (for example, polyester) is used. Further, the non-woven fabric 10 is formed of one or a plurality of actual crimp fibers 11 and has a plurality of arc portions (arc portions 12 shown in FIG. 2) that are visible from the surface.
　図２は、顕在捲縮繊維１１の形状（螺旋形状）についての説明図である。ここでは、１本の繊維（顕在捲縮繊維１１）について示している。図において、顕在捲縮繊維１１の繊維長をＬとし、円弧部１２の三つの点を通る円１３の周長をＳとする。 FIG. 2 is an explanatory diagram of the shape (spiral shape) of the actual crimped fiber 11. Here, one fiber (explicit crimp fiber 11) is shown. In the figure, the fiber length of the actual crimped fiber 11 is L, and the peripheral length of the circle 13 passing through the three points of the arc portion 12 is S.
　図に示すように、Ｓ＞２×Ｌの場合、円弧部１２は円１３の半周未満の円弧となっており、円弧の形状を維持しにくい。また、高粘度の液体（軟便等）を透過させるための低密度部が形成されにくい。 As shown in the figure, when S> 2 × L, the arc portion 12 is an arc less than half the circumference of the circle 13, and it is difficult to maintain the shape of the arc. In addition, it is difficult to form a low-density portion for allowing a high-viscosity liquid (loose stool, etc.) to permeate.
　そこで、本実施形態では、Ｓ≦２×Ｌを満たすようにしている。この場合、顕在捲縮繊維１１によって円１３の半周以上の円弧部１２が形成されることになり、円弧部１２の形状を維持しやすい。これにより、不織布１０には、顕在捲縮繊維１１に起因した低密度部が形成されやすくなり、高粘度の液体（軟便等）を透過させやすくすることができる。 Therefore, in the present embodiment, S ≦ 2 × L is satisfied. In this case, the actual crimped fibers 11 form an arc portion 12 having a half circumference or more of the circle 13, and the shape of the arc portion 12 can be easily maintained. As a result, the non-woven fabric 10 can easily form a low-density portion due to the actual crimped fibers 11, and can easily permeate a high-viscosity liquid (loose stool or the like).
　さらに、Ｓ≦Ｌを満たす場合、円弧部１２が少なくとも円形状になって円１３が形成される。これにより、螺旋状の形状をより維持しやすくなる。ただし、Ｓが小さすぎると、円１３が小さくなって液透過性が悪化するため、Ｓ＞Ｌ／４あるいはＳ＞Ｌ／５であることが好ましい。 Further, when S ≦ L is satisfied, the arc portion 12 has at least a circular shape to form a circle 13. This makes it easier to maintain the spiral shape. However, if S is too small, the circle 13 becomes small and the liquid permeability deteriorates. Therefore, S> L / 4 or S> L / 5 is preferable.
　なお、図２では、円弧部１２（円１３）が１本の顕在捲縮繊維１１で形成されているが、不織布１０において、円弧部１２（円１３）が複数本の顕在捲縮繊維１１で形成されていてもよい。 In FIG. 2, the arc portion 12 (circle 13) is formed of one actual crimp fiber 11, but in the non-woven fabric 10, the arc portion 12 (circle 13) is formed of a plurality of actual crimp fibers 11. It may be formed.
　不織布１０の製法としては、顕在捲縮繊維１１を含む短繊維をエアレイドで積層してウェブを形成し、液体バインダー（接着剤に相当）で繊維同士を接合し、乾燥させてシート化する方法が挙げられる。なお、エアレイドには限られず、例えば、カード機でウェブを形成してもよい。この場合、エアレイドよりも地合いが良好になるため、より長い繊維長のものを使用可能である。ただし、カード機に対して、エアレイドの方が工程中で螺旋捲縮形状が維持されやすい。よって、エアレイドでウェブを形成する方がより好ましい。 As a method for producing the non-woven fabric 10, a method in which short fibers containing the actual crimped fibers 11 are laminated by airlaid to form a web, the fibers are bonded to each other with a liquid binder (corresponding to an adhesive), and dried to form a sheet. Can be mentioned. The web is not limited to the airlaid, and the web may be formed by a card machine, for example. In this case, since the texture is better than that of airlaid, a longer fiber length can be used. However, compared to the card machine, the air-laid type is more likely to maintain the spiral crimped shape during the process. Therefore, it is more preferable to form the web with airlaid.
　本実施形態では上述したように液体バインダーで繊維を接合している。換言すると、顕在捲縮繊維１１同士が液体バインダーで接合されている。これにより、複数本の顕在捲縮繊維１１が絡まりやすいので、円１３の縁部を形成しやすい。 In this embodiment, the fibers are joined with a liquid binder as described above. In other words, the actual crimp fibers 11 are bonded to each other with a liquid binder. As a result, the plurality of actual crimp fibers 11 are easily entangled, so that the edge portion of the circle 13 is easily formed.
　液体バインダーとしては、アクリル酸エステル共重合体、エチレン・酢酸ビニル共重合体、ポリビニルアルコール（ＰＶＡ）、スチレン・ブタジエン（ＳＢＲ）等のエマルジョンバインダーを用いることができる。 As the liquid binder, an emulsion binder such as an acrylic acid ester copolymer, an ethylene / vinyl acetate copolymer, polyvinyl alcohol (PVA), or styrene / butadiene (SBR) can be used.
　さらに、上記のエマルジョンバインダー中に、ジルコニウムやゼオライト等の無機イオン交換体に銀イオンを担持させた無機系抗菌剤や、ジルコニウムやシリカ等の無機質に水酸基（－ＯＨ）やアミノ基（－ＮＨ2）を付加させた平均粒径０．１～５μｍの無機系消臭剤を均一分散させた調整液を繊維に塗布することにより、伸縮性及び嵩回復性に加え、抗菌性や消臭性を有する親水性不織布を得ることができる。また、これには限られず、他の機能剤（軟便改質剤など）を塗布してもよい。 Further, in the above emulsion binder, an inorganic antibacterial agent in which silver ions are carried on an inorganic ion exchanger such as zirconium or zeolite, or a hydroxyl group (-OH) or amino group (-NH2) on an inorganic substance such as zirconium or silica. By applying an adjusting solution in which an inorganic deodorant having an average particle size of 0.1 to 5 μm is uniformly dispersed to the fibers, it has antibacterial and deodorant properties in addition to elasticity and bulk recovery. A hydrophilic non-woven fabric can be obtained. Further, the present invention is not limited to this, and other functional agents (such as a loose stool modifier) may be applied.
　また、円弧部１２の少なくとも一部が、液体バインダー（接着剤）により接合された複数の顕在捲縮繊維１１により構成されていることが好ましい。これにより、円１３の縁部をよりしっかり形成することができる。 Further, it is preferable that at least a part of the arc portion 12 is composed of a plurality of actual crimp fibers 11 joined by a liquid binder (adhesive). Thereby, the edge portion of the circle 13 can be formed more firmly.
　また、顕在捲縮繊維１１の平均繊維長は、５～１５ｍｍであることが好ましい（後述の実施例参照）。なお、ここでの繊維長は、繊維を引き延ばした状態における繊維長さである。繊維長が５ｍｍより短いと捲縮状態における円１３が小さくなって液透過性が低下する。また繊維長が１５ｍｍよりも長いと繊維同士が絡まりやすくなりエアレイドが困難になる（地合いが取れなくなる）。平均繊維長が５～１５ｍｍであることにより、適度な大きさの円弧部１２(円１３)を形成でき、ほどよい地合いを実現できる。ただし、カード機でウェブを製造する場合、地合いが良好になるので上記の繊維長よりも長くても良い。具体的には、カード機を用いる場合の平均繊維長は２５～６４ｍｍが好ましい。この場合もＳ≦２×Ｌを満たすようにすればよい。なお、この場合、Ｓ＞Ｌ／２５程度でもよい。 Further, the average fiber length of the actual crimped fiber 11 is preferably 5 to 15 mm (see Examples described later). The fiber length here is the fiber length in a stretched state. If the fiber length is shorter than 5 mm, the circle 13 in the crimped state becomes smaller and the liquid permeability decreases. Further, if the fiber length is longer than 15 mm, the fibers tend to be entangled with each other, making air laying difficult (the texture cannot be removed). When the average fiber length is 5 to 15 mm, an arc portion 12 (circle 13) having an appropriate size can be formed, and a moderate texture can be realized. However, when the web is manufactured by a card machine, the fiber length may be longer than the above-mentioned fiber length because the texture is good. Specifically, when a card machine is used, the average fiber length is preferably 25 to 64 mm. In this case as well, S ≦ 2 × L may be satisfied. In this case, S> L / 25 may be used.
　また、顕在捲縮繊維１１の繊度が大きすぎると本数が少なくなり地合いが取れなくなる（不均一になる）ため、顕在捲縮繊維１１の繊度は、３０デニール（３３．６ｄｔｅｘ）未満が好ましい。更に好ましくは、３．６～８．９デニール（４～１０ｄｔｅｘ）が良い。これにより、ほどよい地合いを実現できる。 Further, if the fineness of the actual crimped fibers 11 is too large, the number of fibers is reduced and the texture cannot be obtained (non-uniformity). Therefore, the fineness of the manifested crimped fibers 11 is preferably less than 30 denier (33.6 dtex). More preferably, 3.6 to 8.9 denier (4 to 10 dtex) is preferable. As a result, a moderate texture can be realized.
　また、不織布１０における顕在捲縮繊維１１の含有量は８０重量％よりも大きいことが好ましい。これにより、液透過性及びクッション性を高めることができる。 Further, the content of the actual crimp fibers 11 in the non-woven fabric 10 is preferably larger than 80% by weight. Thereby, the liquid permeability and the cushioning property can be improved.
　また、不織布１０の繊維密度は０．２ｇ／ｃｍ3以下であることが好ましい。これにより、液透過性を高めることができる。 The fiber density of the non-woven fabric 10 is preferably 0.2 g / cm 3 or less. Thereby, the liquid permeability can be enhanced.
　また、円１３の半径が不織布１０の厚さ以上の場合、厚さ方向に円１３の半周以上の円弧部１２を形成できないため、円１３の平均半径は、不織布１０の厚さよりも小さいことが好ましい。これにより、厚さ方向において、円１３の半周以上の円弧部１２を形成することができ、クッション性を向上させることができる。 Further, when the radius of the circle 13 is equal to or larger than the thickness of the non-woven fabric 10, the arc portion 12 having a half circumference or more of the circle 13 cannot be formed in the thickness direction, so that the average radius of the circle 13 may be smaller than the thickness of the non-woven fabric 10. preferable. As a result, the arc portion 12 having a half circumference or more of the circle 13 can be formed in the thickness direction, and the cushioning property can be improved.
＜＜実施例＞＞
　以下、本発明の内容について実施例により具体的に説明する。 << Example >>
Hereinafter, the contents of the present invention will be specifically described with reference to Examples.
＜繊維形状の評価＞
　サンプル：シート化前の顕在捲縮繊維（ジェットオープナーで解繊後）
　材質　　：ポリエチレンテレフタレート（ＰＥＴ）
　繊維長：５ｍｍ、１０ｍｍ、１５ｍｍ、２０ｍｍ（カット品の平均値）
　評価項目：捲縮数、捲縮半径
　測定機器：キーエンス製　ＶＨＸ－７１００ <Evaluation of fiber shape>
Sample: Overt crimp fiber before sheeting (after defibration with jet opener)
Material: Polyethylene terephthalate (PET)
Fiber length: 5 mm, 10 mm, 15 mm, 20 mm (average value of cut products)
Evaluation items: Number of crimps, radius of crimp Measuring equipment: VHX-7100 manufactured by KEYENCE
　上記サンプルについて、形成されている円弧部分の中心角が１８０度以上になるか否かを判定し、１８０度以上になるもの（Ｓ≦２×Ｌ）をＯＫ（○）とし、１８０度未満のもの（Ｓ＞２×Ｌ）をＮＧ（×）とした（図２参照）。なお、中心角は、測定機器（ＶＨＸ－７１００）の計測モードで円弧両端を含む計３点を選択して自動計測させ、１８０度以上か否かを判定した。さらに判定でＯＫ（○）となった繊維の繊維形状（捲縮数、捲縮半径）を評価した。 For the above sample, it is determined whether or not the central angle of the formed arc portion is 180 degrees or more, and the one having 180 degrees or more (S ≦ 2 × L) is OK (◯) and less than 180 degrees. The thing (S> 2 × L) was regarded as NG (×) (see FIG. 2). The central angle was automatically measured by selecting a total of three points including both ends of the arc in the measurement mode of the measuring device (VHX-7100), and it was determined whether or not the central angle was 180 degrees or more. Further, the fiber shape (number of crimps, crimp radius) of the fiber that was OK (◯) in the judgment was evaluated.
（捲縮数）
　図３は、繊維長と捲縮数の関係の評価結果を示す図である。図では参考に一般繊維についても示している。捲縮数としては、測定機器で測定された実測値と、１インチ当たりに換算した値とを示している。なお、図３に示す捲縮数は、上記の判定でＯＫとなった繊維３０本についての平均値である。
　図３に示すように、繊維長が長いほど、捲縮数（実測値）が大きくなっている。ただし、１インチ当たりの捲縮数は、繊維長にかかわらずほぼ同じ値（約６個）となっている。 (Number of crimps)
FIG. 3 is a diagram showing an evaluation result of the relationship between the fiber length and the number of crimps. In the figure, general fibers are also shown for reference. As the number of crimps, the measured value measured by the measuring device and the value converted per inch are shown. The number of crimps shown in FIG. 3 is an average value for 30 fibers that were OK in the above determination.
As shown in FIG. 3, the longer the fiber length, the larger the number of crimps (measured value). However, the number of crimps per inch is almost the same value (about 6) regardless of the fiber length.
（捲縮半径）
　図４は、捲縮半径の評価結果を示す図である。ここでは上記の判定でＯＫの円弧部１２によって形成される円１３（円弧部１２の三つの点を通る円）の半径を求めた。捲縮半径は、測定機器（ＶＨＸ－７１００）の計測モード（３点指定）で表示させて計測した。　
　なお、図４に示す捲縮半径は、図３と同様に、上記の判定でＯＫとなった繊維３０本についての平均値である。捲縮半径は、１インチ当たりの捲縮数と同様に、繊維長にかかわらず、ほぼ同じ値（約０．９～１ｍｍ）となっている。 (Curly radius)
FIG. 4 is a diagram showing the evaluation result of the crimp radius. Here, the radius of the circle 13 (the circle passing through the three points of the arc portion 12) formed by the arc portion 12 of OK was obtained by the above determination. The crimp radius was measured by displaying it in the measurement mode (designated at 3 points) of the measuring device (VHX-7100).
The crimp radius shown in FIG. 4 is an average value for 30 fibers that were OK in the above determination, as in FIG. The crimp radius is almost the same value (about 0.9 to 1 mm) regardless of the fiber length, similar to the number of crimps per inch.
＜シート化時の状態評価＞
　次に、上記の顕在捲縮繊維（繊維長５ｍｍ）を用いてシート化した状態について評価を行った。シート化する際の接着剤としてはアクリル系エマルジョンバインダーを用いた。また、比較例として、一般繊維（螺旋捲縮でない繊維）を用いたシート（不織布）も観察した。比較例では、繊維長が５ｍｍで材質がＰＥ／ＰＥＴ（Ｓ／Ｃ）の繊維を用いており、熱で繊維を接着（熱融着）している。 <State evaluation at the time of sheeting>
Next, the state of being made into a sheet using the above-mentioned actual crimped fibers (fiber length 5 mm) was evaluated. An acrylic emulsion binder was used as an adhesive for forming a sheet. In addition, as a comparative example, a sheet (nonwoven fabric) using general fibers (fibers that are not spirally crimped) was also observed. In the comparative example, fibers having a fiber length of 5 mm and a material of PE / PET (S / C) are used, and the fibers are bonded (heat-fused) by heat.
　図５は、シートの表面の観察結果を示す図である。また図６はシートの断面の観察結果を示す図である。なお、図５、図６では、電子顕微鏡を用いて、倍率３０倍で観察を行った。また、図７は、実施例と比較例のシート表面の比較図である。図７では、実施例及び比較例について、それぞれ、３枚（Ｎｏ１、Ｎｏ２、Ｎｏ３）のシートの観察を行った結果を示している。また、図８は、図７の実施例（Ｎｏ１）の拡大図である。図８では、顕在捲縮繊維によって形成された円１３を図示している。 FIG. 5 is a diagram showing the observation results of the surface of the sheet. Further, FIG. 6 is a diagram showing an observation result of a cross section of the sheet. In FIGS. 5 and 6, observation was performed at a magnification of 30 times using an electron microscope. Further, FIG. 7 is a comparative view of the sheet surfaces of Examples and Comparative Examples. FIG. 7 shows the results of observing three sheets (No1, No2, No3) for each of Examples and Comparative Examples. Further, FIG. 8 is an enlarged view of the embodiment (No. 1) of FIG. 7. FIG. 8 illustrates the circle 13 formed by the overt crimp fibers.
　図８に示すように、実施例の表面には、１本又は複数本の顕在捲縮繊維によって複数の円１３が形成されている。これらの円１３で囲まれた円領域Ｒは、繊維の密度が低い低密度部となっている。これに対し、比較例では実施例のような円が形成されておらず、ほぼ均等に繊維が配置されている（図５、図７参照）。このように、実施例では比較例よりも低密度の部位（円領域Ｒ）が多く形成されており、比較例よりも高粘度の液体を透過させやすい。また、図６に示すように、実施例では、厚さ方向にも円弧が形成されていることにより、比較例よりも厚みが大きくなっており、クッション性が向上している。 As shown in FIG. 8, a plurality of circles 13 are formed on the surface of the embodiment by one or a plurality of actual crimped fibers. The circular region R surrounded by these circles 13 is a low-density portion where the fiber density is low. On the other hand, in the comparative example, the circles as in the embodiment are not formed, and the fibers are arranged substantially evenly (see FIGS. 5 and 7). As described above, in the examples, more low-density portions (circular regions R) are formed than in the comparative examples, and it is easier for the liquid having a higher viscosity to permeate than in the comparative examples. Further, as shown in FIG. 6, in the embodiment, since the arc is formed in the thickness direction as well, the thickness is larger than that in the comparative example, and the cushioning property is improved.
　図８に示す複数の円１３の平均半径は０．７３ｍｍであり、円１３の平均周長は４．５８ｍｍであった。顕在捲縮繊維の繊維長が５ｍｍであるので、Ｓ≦２×Ｌを満たしている。ここで、平均周長とは、顕在捲縮繊維による円弧部が１０個以上視認される領域（図８では長辺約１６ｍｍ、短辺約１２ｍｍの矩形領域）で、１０個以上の円１３を抽出し、その各円１３の周長を平均することによって求められるものである。なお、上記の平均周長は、抽出した円１３の平均半径で形成される円の周長と等しくなる（平均半径から平均周長を求めることができる）。 The average radius of the plurality of circles 13 shown in FIG. 8 was 0.73 mm, and the average circumference of the circle 13 was 4.58 mm. Since the fiber length of the actual crimped fiber is 5 mm, S ≦ 2 × L is satisfied. Here, the average circumference is a region where 10 or more arcs due to the apparent crimped fibers are visually recognized (rectangular region with a long side of about 16 mm and a short side of about 12 mm in FIG. 8), and 10 or more circles 13 are formed. It is obtained by extracting and averaging the circumferences of each of the circles 13. The average perimeter is equal to the perimeter of the circle formed by the average radius of the extracted circle 13 (the average perimeter can be obtained from the average radius).
　また実施例のＮｏ２、Ｎｏ３についてもそれぞれ、同様に複数の円１３（円領域Ｒ）が形成されており（図示省略）、Ｎｏ２における円１３の平均半径は０．８２ｍｍ、Ｎｏ３における円１３の平均半径は０．８３ｍｍであった。Ｎｏ２における円１３の平均周長は５．０２ｍｍ、Ｎｏ３における円１３の平均周長は５．２１ｍｍであるので、ともに、Ｓ≦２×Ｌを満たしている。 Similarly, a plurality of circles 13 (circle region R) are formed in each of No. 2 and No. 3 of the embodiment (not shown), the average radius of the circle 13 in No. 2 is 0.82 mm, and the average of the circle 13 in No. 3 is 0.82 mm. The radius was 0.83 mm. Since the average circumference of the circle 13 in No. 2 is 5.02 mm and the average circumference of the circle 13 in No. 3 is 5.21 mm, both satisfy S ≦ 2 × L.
　なお、図８に示すシート表面において、複数の円１３で囲まれる円領域Ｒの合計面積よりも、円領域Ｒ以外の面積の方が大きいことが好ましい。これにより、適度な液透過性にすることができる（逆の場合、すかすかになり過ぎて、液体を透過させ過ぎるおそれがある）。 On the sheet surface shown in FIG. 8, it is preferable that the area other than the circle area R is larger than the total area of the circle areas R surrounded by the plurality of circles 13. As a result, it is possible to obtain an appropriate liquid permeability (in the opposite case, the liquid may become too faint and the liquid may be permeated too much).
　図９は、繊維長の違いによるシート化時の状態の評価結果を示す図である。ここでは、繊維長が５ｍｍ、１０ｍｍ、１５ｍｍ、２０ｍｍの顕在捲縮繊維を用いて、それぞれ、シートを３枚作成し（Ｎｏ１，Ｎｏ２，Ｎｏ３）、シート表面の観察を行った。 FIG. 9 is a diagram showing an evaluation result of a state at the time of sheet formation due to a difference in fiber length. Here, three sheets were prepared (No1, No2, No3) using actual crimped fibers having fiber lengths of 5 mm, 10 mm, 15 mm, and 20 mm, and the sheet surface was observed.
　図９において、繊維長が５ｍｍより長くても、シート化した際に螺旋形状は維持されており（すなわち顕在捲縮繊維によって複数の円が形成されており）、液透過性の向上を図ることができる。なお、繊維長が長くなると、繊維同士が絡まって地合いが取れなくなる傾向がある。このため、繊維長は５～１５ｍｍが好ましい。 In FIG. 9, even if the fiber length is longer than 5 mm, the spiral shape is maintained when the sheet is formed (that is, a plurality of circles are formed by the apparent crimped fibers), and the liquid permeability is improved. Can be done. In addition, when the fiber length becomes long, the fibers tend to be entangled with each other and the texture cannot be obtained. Therefore, the fiber length is preferably 5 to 15 mm.
＜＜吸収性物品について＞＞
　以下では、本実施形態の不織布１０をパンツ型使い捨ておむつ１（以下、単に「おむつ１」とも呼ぶ）に適用した場合を例に挙げて説明する。ただし、これに限定されず、例えば、他の型のおむつ、生理用ナプキン、おりものシート、尿取りパッド等のその他の吸収性物品に対しても適用可能である。 << About absorbent articles >>
In the following, a case where the non-woven fabric 10 of the present embodiment is applied to a pants-type disposable diaper 1 (hereinafter, also simply referred to as “diaper 1”) will be described as an example. However, the present invention is not limited to this, and the application is also applicable to other absorbent articles such as other types of diapers, sanitary napkins, vaginal discharge sheets, and urine absorbing pads.
　図１０は、おむつ１を腹側から見た概略斜視図である。図１１は、展開且つ伸長状態であるおむつ１の平面図である。図１２は、図１１中のＡ－Ａ概略断面図である。なお、図１１における「伸長状態」とは、製品（おむつ１）を皺なく伸長させた状態、具体的には、おむつ１を構成する各部材（例えば、後述する前身頃部３０等）の寸法がその部材単体の寸法と一致又はそれに近い長さになるまで伸長した状態のことを言う。また、図１３は、吸収性本体５０のトップシート５１とセカンドシート５２と吸収体５３を分離して示した概略斜視図である。 FIG. 10 is a schematic perspective view of the diaper 1 as viewed from the ventral side. FIG. 11 is a plan view of the diaper 1 in an unfolded and extended state. FIG. 12 is a schematic cross-sectional view taken along the line AA in FIG. The "extended state" in FIG. 11 refers to a state in which the product (diaper 1) is extended without wrinkles, specifically, the dimensions of each member (for example, the front body portion 30 to be described later) constituting the diaper 1. Refers to a state in which is extended until the length of the member is equal to or close to the size of the member alone. Further, FIG. 13 is a schematic perspective view showing the top sheet 51, the second sheet 52, and the absorber 53 of the absorbent main body 50 separately.
　おむつ１は、図１０のパンツ型状態において、互いに直交する三方向として上下方向と左右方向（幅方向ともいう）と前後方向とを有している。そして、以下では、上下方向において、着用者の胴側となる側を「上側」とし、着用者の股下となる側を「下側」とする。前後方向において、着用者の腹側となる側を「前側」とし、着用者の背側となる側を「後側」とする。また、左右方向において、おむつ１を前側から見た時の右側を「右側」とし、左側を「左側」とする。 The diaper 1 has a vertical direction, a horizontal direction (also referred to as a width direction), and a front-rear direction as three directions orthogonal to each other in the pants-shaped state shown in FIG. In the following, in the vertical direction, the side that becomes the wearer's torso side is referred to as the "upper side", and the side that becomes the wearer's inseam side is referred to as the "lower side". In the anterior-posterior direction, the ventral side of the wearer is referred to as the "front side" and the dorsal side of the wearer is referred to as the "posterior side". Further, in the left-right direction, the right side when the diaper 1 is viewed from the front side is defined as the "right side", and the left side is defined as the "left side".
　一方、図１１、図１２の展開状態においては、おむつ１は、互いに直交する三方向として長手方向と左右方向と厚さ方向とを有している。なお、展開状態における上記の左右方向（幅方向）は、パンツ型状態（図１０）における上記の左右方向と同じ方向である。また、展開状態の長手方向は、パンツ型状態の上下方向に沿った方向である。また、図１２に示すように、上下方向（長手方向）及び左右方向と直交する「厚さ方向」のうち、着用対象者（着用者）の肌と当接する側を「肌側」とし、その反対側を「非肌側」とする。 On the other hand, in the unfolded state of FIGS. 11 and 12, the diaper 1 has a longitudinal direction, a left-right direction, and a thickness direction as three directions orthogonal to each other. The left-right direction (width direction) in the unfolded state is the same direction as the left-right direction in the pants-type state (FIG. 10). Further, the longitudinal direction in the unfolded state is a direction along the vertical direction in the pants-shaped state. Further, as shown in FIG. 12, of the "thickness direction" orthogonal to the vertical direction (longitudinal direction) and the horizontal direction, the side that comes into contact with the skin of the wearer (wearer) is defined as the "skin side". The opposite side is the "non-skin side".
　本実施形態のおむつ１は、股下外装部２０と、前身頃部３０と、後身頃部４０と、吸収性本体５０と、を有する。なお、股下外装部２０、前身頃部３０、及び、後身頃部４０は、外装部材に相当し、吸収性本体５０に接合されている。そして、これらの外装部材により、図１１に示すように、腹側胴回り部１Ａ、股間部１Ｂ、及び、背側胴回り部１Ｃが構成されている。なお、本実施形態のおむつ１では外装部材が３部材（股下外装部２０、前身頃部３０、後身頃部４０）で構成されているが、これに限らない。例えば、股下外装部２０、前身頃部３０、及び、後身頃部４０が１つの部材であってもよい。また、股下外装部２０を有さない構成としてもよい。 The diaper 1 of the present embodiment has an inseam exterior portion 20, a front body portion 30, a rear body portion 40, and an absorbent main body 50. The inseam exterior portion 20, the front body portion 30, and the rear body portion 40 correspond to the exterior members and are joined to the absorbent main body 50. Then, as shown in FIG. 11, these exterior members constitute a ventral waist circumference portion 1A, a crotch portion 1B, and a dorsal waist circumference portion 1C. In the diaper 1 of the present embodiment, the exterior member is composed of three members (inseam exterior portion 20, front body portion 30, and rear body portion 40), but the present invention is not limited to this. For example, the inseam exterior portion 20, the front body portion 30, and the rear body portion 40 may be one member. Further, the inseam exterior portion 20 may not be provided.
　股下外装部２０は、おむつ１の着用時に着用者の股下に位置する部位（股間部１Ｂの一部を構成する部位）である。股下外装部２０はスパンボンド不織布等によって形成されている。 The inseam exterior portion 20 is a portion located in the inseam of the wearer when the diaper 1 is worn (a portion forming a part of the crotch portion 1B). The inseam exterior portion 20 is formed of a spunbonded non-woven fabric or the like.
　前身頃部３０は、おむつ１の着用時に着用者の腹側胴回りに位置する部位（主に腹側胴回り部１Ａを構成する部位）である。前身頃部３０は、厚さ方向に重ねられた腹側内層シート３１と、腹側外層シート３３を有する。図１２に示すように、腹側内層シート３１は厚さ方向の肌側に配置され、腹側外層シート３３は厚さ方向の非肌側に配置されている。腹側外層シート３３の上端部は腹側内層シート３１の上端部よりも上側に突出しており、当該突出した部分は前身頃部３０の上端３０ｅｕの位置にて厚さ方向の肌側の下方に折り返され、折り返し部３３ｆを形成している。前身頃部３０の上端３０ｅｕが折り返し部３３ｆによって覆われることにより、おむつ１の着用時において前身頃部３０の上端エッジ（すなわち胴回り開口ＢＨ）が着用者の肌に食い込みにくくなり、腹側胴回り部１Ａにおける不快感を生じにくくすることができる。 The front body portion 30 is a portion located around the ventral waist of the wearer when the diaper 1 is worn (mainly a portion constituting the ventral waist circumference 1A). The front body portion 30 has a ventral inner layer sheet 31 and a ventral outer layer sheet 33 stacked in the thickness direction. As shown in FIG. 12, the ventral inner layer sheet 31 is arranged on the skin side in the thickness direction, and the ventral outer layer sheet 33 is arranged on the non-skin side in the thickness direction. The upper end of the ventral outer layer sheet 33 projects upward from the upper end of the ventral inner layer sheet 31, and the protruding portion is located below the skin side in the thickness direction at the position of the upper end 30 eu of the front body portion 30. It is folded back to form a folded-back portion 33f. By covering the upper end 30eu of the front body portion 30 with the folded-back portion 33f, the upper end edge of the front body portion 30 (that is, the waist circumference opening BH) is less likely to bite into the wearer's skin when the diaper 1 is worn, and the ventral waist circumference portion It is possible to reduce the discomfort in 1A.
　また、腹側内層シート３１と腹側外層シート３３の厚さ方向の間には、糸ゴム等の弾性部材が設けられている。本実施形態では、図１１及び図１２に示すように、前身頃部３０の左右方向の右側端部と左側端部との間の領域に、複数の腹側胴回り弾性部材３４が設けられている。複数の腹側胴回り弾性部材３４は、上下方向に間隔を空けて、且つ、所定の伸長倍率で横方向に伸長された状態で腹側内層シート３１と腹側外層シート３３との間に挟まれて接合されている。このように設けられた腹側胴回り弾性部材３４によって、おむつ１の前身頃部３０に幅方向の伸縮性が付与される。 Further, an elastic member such as rubber thread is provided between the ventral inner layer sheet 31 and the ventral outer layer sheet 33 in the thickness direction. In the present embodiment, as shown in FIGS. 11 and 12, a plurality of ventral waist elastic members 34 are provided in the region between the right end portion and the left end portion in the left-right direction of the front body portion 30. .. The plurality of ventral waist elastic members 34 are sandwiched between the ventral inner layer sheet 31 and the ventral outer layer sheet 33 in a state of being vertically spaced and laterally extended at a predetermined extension ratio. It is joined. The ventral waistline elastic member 34 provided in this way imparts elasticity in the width direction to the front body portion 30 of the diaper 1.
　また、前身頃部３０の胴回り開口ＢＨの縁に沿った領域には複数のウエスト弾性部材３５が同様に上下方向に間隔を空けて設けられている。 Further, a plurality of waist elastic members 35 are similarly provided at intervals in the vertical direction in the region along the edge of the waist circumference opening BH of the front body portion 30.
　後身頃部４０は、おむつ１の着用時に着用者の背側胴回りに位置する部位（主に背側胴回り部１Ｃを構成する部位）である。後身頃部４０の構造は、前身頃部３０と略同様である。すなわち、後身頃部４０は、厚さ方向に重ねられた背側内層シート４１と背側外層シート４３を有している。背側外層シート４３の上端部は背側内層シート４１の上端部よりも上側に突出しており、当該突出した部分は後身頃部４０の上端４０ｅｕの位置にて厚さ方向の肌側の下方に折り返され、折り返し部４３ｆを形成している。これにより、おむつ１の着用時において後身頃部４０の上端エッジ（胴回り開口ＢＨ）が着用者の肌に食い込みにくくなり、背側胴回り部１Ｃにおける不快感を生じにくくすることができる。 The back body portion 40 is a portion (mainly a portion constituting the dorsal waist circumference portion 1C) located around the dorsal waist circumference of the wearer when the diaper 1 is worn. The structure of the back body portion 40 is substantially the same as that of the front body portion 30. That is, the back body portion 40 has a dorsal inner layer sheet 41 and a dorsal outer layer sheet 43 stacked in the thickness direction. The upper end of the dorsal outer layer sheet 43 projects upward from the upper end of the dorsal inner layer sheet 41, and the protruding portion is located below the skin side in the thickness direction at the position of the upper end 40eu of the back body portion 40. It is folded back to form a folded-back portion 43f. As a result, when the diaper 1 is worn, the upper end edge (girth opening BH) of the back body portion 40 is less likely to bite into the wearer's skin, and discomfort in the dorsal waist circumference portion 1C can be less likely to occur.
　また、図１１及び図１２に示すように、後身頃部４０の左右方向の右側端部と左側端部との間の領域に、複数の背側胴回り弾性部材４４が設けられている。複数の背側胴回り弾性部材４４は、上下方向に間隔を空けて、且つ、所定の伸長倍率で左右方向に伸長された状態で背側内層シート４１と背側外層シート４３との間に挟まれて接合されている。この背側胴回り弾性部材４４によって、おむつ１の後身頃部４０に幅方向の伸縮性が付与される。また、後身頃部４０の胴回り開口ＢＨの縁に沿った領域には複数のウエスト弾性部材４５が同様に上下方向に間隔を空けて設けられている。なお、上下方向に隣接する背側胴回り弾性部材４４の間隔、及び、ウエスト弾性部材４５の間隔は、それぞれ、腹側胴回り弾性部材３４の間隔、及び、ウエスト弾性部材３５の間隔と同じである。 Further, as shown in FIGS. 11 and 12, a plurality of dorsal waist circumference elastic members 44 are provided in the region between the right end portion and the left end portion in the left-right direction of the back body portion 40. The plurality of dorsal waist elastic members 44 are sandwiched between the dorsal inner layer sheet 41 and the dorsal outer layer sheet 43 in a state of being vertically spaced and extended in the left and right directions at a predetermined extension ratio. Is joined. The dorsal waistline elastic member 44 imparts elasticity in the width direction to the back body portion 40 of the diaper 1. Further, a plurality of waist elastic members 45 are similarly provided at intervals in the vertical direction in a region along the edge of the waist circumference opening BH of the rear body portion 40. The intervals between the dorsal elastic members 44 adjacent to each other in the vertical direction and the intervals between the waist elastic members 45 are the same as the intervals between the ventral elastic members 34 and the intervals between the waist elastic members 35, respectively.
　また、図１１に示すように、前身頃部３０及び後身頃部４０の一対の脚回り開口ＨＬの縁に沿った領域にも例えば糸ゴム等の脚回り弾性部材３６、４６がそれぞれ複数設けられている。複数の脚回り弾性部材３６、４６は、腹側内層シート３１と腹側外層シート３３の間、及び、背側内層シート４１と背側外層シート４３の間に、伸長した状態で取り付けられている。そのため、前身頃部３０及び後身頃部４０は着用者の脚回りにフィットする。 Further, as shown in FIG. 11, a plurality of leg circumference elastic members 36, 46 such as thread rubber are provided in the regions along the edges of the pair of leg circumference openings HL of the front body portion 30 and the rear body portion 40, respectively. ing. The plurality of elastic members around the legs 36, 46 are attached in an extended state between the ventral inner layer sheet 31 and the ventral outer layer sheet 33, and between the dorsal inner layer sheet 41 and the dorsal outer layer sheet 43. Therefore, the front body portion 30 and the back body portion 40 fit around the legs of the wearer.
　吸収性本体５０は、尿等の***物を吸収する機能を有し、図１１に示すように平面視略長方形をなし、その長手方向をおむつ１の上下方向に沿わせつつ左右方向の中央に配置されている。吸収性本体５０の詳細については後述する。 The absorbent main body 50 has a function of absorbing excrement such as urine, has a substantially rectangular shape in a plan view as shown in FIG. 11, and has its longitudinal direction along the vertical direction of the diaper 1 in the center of the horizontal direction. Have been placed. Details of the absorbent body 50 will be described later.
　そして、図１１の展開状態に各部材を配置（接合）した後、吸収性本体５０の長手方向（上下方向）の所定位置ＣＬを折り位置として同吸収性本体５０が二つ折りされるとともに、この二つ折りの状態において互いに対向する前身頃部３０及び後身頃部４０が腹側サイド接合部３０ｅｓ及び背側サイド接合部４０ｅｓにて溶着等で接合される。これにより、前身頃部３０及び後身頃部４０が環状に繋がって、図１に示すような胴回り開口ＢＨ及び一対の脚回り開口ＬＨ，ＬＨが形成されたパンツ型状態のおむつ１となる。 Then, after arranging (joining) each member in the unfolded state of FIG. 11, the absorbent main body 50 is folded in half with the predetermined position CL in the longitudinal direction (vertical direction) of the absorbent main body 50 as a folding position, and the absorbent main body 50 is folded in half. In the folded state, the front body portion 30 and the rear body portion 40 facing each other are joined by welding or the like at the ventral side joint portion 30es and the dorsal side joint portion 40es. As a result, the front body portion 30 and the rear body portion 40 are connected in an annular shape to form a pants-type diaper 1 in which a waist opening BH and a pair of leg openings LH and LH are formed as shown in FIG.
＜吸収性本体５０について＞
　吸収性本体５０は、前述したように、尿等の***物（液体）を吸収する機能を有している。本実施形態のおむつ１において、吸収性本体５０は、図１２に示すように、厚さ方向の肌側（着用者に接する側）から順に、少なくとも一部が液透過性のトップシート５１と、液透過性のセカンドシート５２（不織布１０）と、吸収体５３と、液不透過性のバックシート５４を有している。 <About absorbent body 50>
As described above, the absorbent main body 50 has a function of absorbing excrement (liquid) such as urine. In the diaper 1 of the present embodiment, as shown in FIG. 12, the absorbent main body 50 has the top sheet 51, which is at least partially permeable to liquid, in order from the skin side (the side in contact with the wearer) in the thickness direction. It has a liquid-permeable second sheet 52 (nonwoven fabric 10), an absorber 53, and a liquid-impermeable back sheet 54.
　トップシート５１（シート部材に相当）は、例えば不織布であり、厚さ方向に貫通する孔５１ａが複数形成されている。このようにトップシート５１が不織布である場合、レーヨン等のセルロース繊維、合成樹脂繊維等から形成されたスパンレース不織布、前記合成樹脂繊維で形成されたエアスルー不織布等を用いることができる。本実施形態のトップシート５１は、セカンドシート５２の顕在捲縮繊維１１よりも繊度の小さい繊維で形成されている。なお、不織布には限られず、多数の液透過孔が形成された樹脂フィルム、多数の網目を有するネット状シートなどでもよい。樹脂フィルムやネット状シートの素材としては、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリエチレンテレフタレート（ＰＥＴ）等が挙げられる。 The top sheet 51 (corresponding to a sheet member) is, for example, a non-woven fabric, and a plurality of holes 51a penetrating in the thickness direction are formed. When the top sheet 51 is a non-woven fabric as described above, a spunlace non-woven fabric formed of cellulose fibers such as rayon, synthetic resin fibers, or the like, an air-through non-woven fabric formed of the synthetic resin fibers, or the like can be used. The top sheet 51 of the present embodiment is formed of fibers having a finer fineness than the actual crimped fibers 11 of the second sheet 52. The non-woven fabric is not limited to the non-woven fabric, and a resin film having a large number of liquid permeation holes formed therein, a net-like sheet having a large number of meshes, and the like may be used. Examples of the material of the resin film and the net-like sheet include polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET) and the like.
　なお、トップシート５１が、ポリプロピレン、ポリエチレン等の熱可塑性樹脂繊維によって構成される場合、孔５１ａの形成は、例えば、加熱されたピン部材（不図示）等を使用して行うことが可能である。具体的には、複数のピン部材が配置された上型と、複数の穴が配置された下型とからなる上下一対の金型を使用して、シートに貫通孔を形成できる。すなわち、上型の各ピン部材が、下型の各穴に差し込まれることにより、上型及び下型に挟まれたシート（ここではトップシート５１）に貫通孔（孔５１ａ）が形成される。 When the top sheet 51 is made of a thermoplastic resin fiber such as polypropylene or polyethylene, the holes 51a can be formed by using, for example, a heated pin member (not shown). .. Specifically, a through hole can be formed in the sheet by using a pair of upper and lower dies including an upper die in which a plurality of pin members are arranged and a lower die in which a plurality of holes are arranged. That is, by inserting each pin member of the upper mold into each hole of the lower mold, a through hole (hole 51a) is formed in the sheet (here, the top sheet 51) sandwiched between the upper mold and the lower mold.
　トップシート５１に形成される孔５１ａの孔径及び配置は、それぞれ、上型のピン部材の太さ及び配置によって調整可能である。また、孔５１ａの配列は千鳥状、格子状、波状など、特に限定されない。また、本実施形態において孔５１ａの形状は丸（円）型であるが、これには限られず、例えば楕円型、四角型等でもよい。 The hole diameter and arrangement of the holes 51a formed in the top sheet 51 can be adjusted by the thickness and arrangement of the pin members of the upper mold, respectively. The arrangement of the holes 51a is not particularly limited, such as staggered, grid-like, and wavy. Further, in the present embodiment, the shape of the hole 51a is a round shape, but the shape is not limited to this, and may be, for example, an elliptical shape or a square shape.
　バックシート５４は、液不透過性のシートであり、吸収体５３に吸収された液体（***物等）が外へ漏れ出すのを防止できる材料が使用される。また、透湿性素材とすることにより、装着時のムレを低減させることができ、装着時における不快感を低減させることが可能となる。 The back sheet 54 is a liquid impermeable sheet, and a material capable of preventing the liquid (excrement, etc.) absorbed by the absorber 53 from leaking to the outside is used. Further, by using a breathable material, it is possible to reduce stuffiness at the time of wearing, and it is possible to reduce discomfort at the time of wearing.
　このような材料としては、例えば、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等を主体とした液不透過性フィルム、通気性フィルム、スパンボンド等の不織布の片面に液不透過性フィルムをラミネートした複合シート等が挙げられる。好ましくは、疎水性の不織布、不透水性のプラスチッククフィルム、不織布と不透水性プラスチックフィルムとのラミネートシート等を用いることができる。また、耐水性の高いメルトブローン不織布を強度の強いスパンボンド不織布で挟んだＳＭＳ不織布でも良い。 As such a material, for example, a composite in which a liquid-impermeable film mainly composed of polyethylene (PE), polypropylene (PP) or the like, a liquid-impermeable film, a breathable film, a spunbond or the like is laminated on one side of a non-woven fabric. Examples include sheets. Preferably, a hydrophobic non-woven fabric, an impermeable plastic film, a laminated sheet of the non-woven fabric and the impermeable plastic film and the like can be used. Further, an SMS non-woven fabric in which a melt-blown non-woven fabric having high water resistance is sandwiched between spunbonded non-woven fabrics having high strength may be used.
　吸収体５３は、***物（液体）を吸収して内部に保持する機能を有する部材である。吸収体５３は、嵩高であり、型崩れし難く、化学的刺激が少ないものであることが好ましい。例えば、フラッフ状パルプもしくはエアレイド不織布と高吸収ポリマーとからなる吸収体材料を例示できる。 The absorber 53 is a member having a function of absorbing excrement (liquid) and holding it inside. It is preferable that the absorber 53 is bulky, does not easily lose its shape, and has little chemical irritation. For example, an absorber material composed of fluffy pulp or air-laid non-woven fabric and a highly absorbent polymer can be exemplified.
　フラッフ状パルプとしては、例えば、化学パルプ、セルロース繊維、レーヨン、アセテート等の人工セルロース繊維を例示できる。エアレイド不織布としては、例えば、パルプと合成繊維とを熱融着させたもの又はバインダーで固着させたものを例示できる。高吸収ポリマー（ＳＡＰ）としては、例えば、デンプン系、アクリル酸系、アミノ酸系の粒子状又は繊維状のポリマーを例示できる。 Examples of the fluffy pulp include chemical pulp, cellulose fibers, rayon, acetate and other artificial cellulose fibers. Examples of the air-laid non-woven fabric include those obtained by heat-sealing pulp and synthetic fibers or those fixed with a binder. Examples of the highly absorbent polymer (SAP) include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers.
　吸収体５３の形状及び構造は必要に応じて変えることができるが、吸収体５３の全吸収量は、吸収性物品としての設計挿入量及び所望の用途に対応させる必要がある。また、吸収体５３のサイズや吸収能力等は用途に対応して変動される。 The shape and structure of the absorber 53 can be changed as needed, but the total absorption amount of the absorber 53 needs to correspond to the design insertion amount as an absorbent article and the desired application. In addition, the size and absorption capacity of the absorber 53 vary depending on the application.
　なお、本実施形態の吸収体５３は、２層構造であり、上層コア５３ａと、上層コア５３ａよりも厚さ方向の非肌側に配置された下層コア５３ｂと、を有して構成されている。ただし、これには限られず、吸収体５３が１層構造で構成されていてもよい。また、吸収体５３がティッシュ等の液透過性シートで被覆されていてもよい。 The absorber 53 of the present embodiment has a two-layer structure, and includes an upper layer core 53a and a lower layer core 53b arranged on the non-skin side in the thickness direction of the upper layer core 53a. There is. However, the present invention is not limited to this, and the absorber 53 may have a one-layer structure. Further, the absorber 53 may be coated with a liquid permeable sheet such as tissue.
　また、図１３に示すように、トップシート５１と吸収体５３との間（すなわち、吸収体５３よりも肌側）には、本実施形態の不織布１０で構成されたセカンドシート５２が設けられている。セカンドシート５２は、トップシート５１との密度勾配による吸収性の向上、***物の逆戻り防止、クッション性の向上等の役割を果たすためのシートである。本実施形態のセカンドシート５２（不織布１０）は、顕在捲縮繊維１１によって形成される低密度部があることにより、高粘度の液体の一部をトップシート５１から吸収体５３へと移行させやすい。 Further, as shown in FIG. 13, a second sheet 52 made of the non-woven fabric 10 of the present embodiment is provided between the top sheet 51 and the absorber 53 (that is, on the skin side of the absorber 53). There is. The second sheet 52 is a sheet that plays a role of improving absorption due to a density gradient with the top sheet 51, preventing excrement from returning, and improving cushioning. The second sheet 52 (nonwoven fabric 10) of the present embodiment has a low-density portion formed by the actual crimp fibers 11, so that a part of the high-viscosity liquid can be easily transferred from the top sheet 51 to the absorber 53. ..
　図１３において、トップシート５１には複数の孔５１ａが複数設けられており、セカンドシート５２には、１本又は複数本の顕在捲縮繊維１１によって形成される円１３が複数設けられている。本実施形態において、孔５１ａと円１３はほぼ同じ大きさである。また、トップシート５１の孔５１ａは所定の配列（パターン）で形成されているのに対し、セカンドシート５２の円１３は、ランダムに形成されている。このため、孔５１ａと円１３が互いに重なる部位と、互いに重ならない部位が存在する。換言すると、セカンドシート５２の複数の円１３のうちの或る円１３は、トップシート５１の或る孔５１ａと少なくとも一部が重なっており、別の円１３は、トップシート５１の孔５１ａと重なっていない。このように、円１３と孔５１ａが互いに重なっている部位があることにより高粘度の液体を吸収体５３へ移行させやすくなる。また、重ならない部位があることによりセカンドシート５２からトップシート５１への逆戻りを抑制できる。 In FIG. 13, a plurality of holes 51a are provided in the top sheet 51, and a plurality of circles 13 formed by one or a plurality of actual crimp fibers 11 are provided in the second sheet 52. In the present embodiment, the holes 51a and the circle 13 have substantially the same size. Further, the holes 51a of the top sheet 51 are formed in a predetermined arrangement (pattern), while the circles 13 of the second sheet 52 are randomly formed. Therefore, there are a portion where the hole 51a and the circle 13 overlap each other and a portion where the hole 51a and the circle 13 do not overlap each other. In other words, one of the plurality of circles 13 of the second sheet 52 overlaps at least a part of a certain hole 51a of the top sheet 51, and another circle 13 overlaps with the hole 51a of the top sheet 51. It does not overlap. As described above, the presence of the portion where the circle 13 and the hole 51a overlap each other facilitates the transfer of the highly viscous liquid to the absorber 53. Further, since there is a non-overlapping portion, it is possible to suppress the reversion from the second seat 52 to the top seat 51.
　以上説明したように、本実施形態の不織布１０は軟便等の高粘度の液体を透過させやすいので、おむつ１のセカンドシート５２に適用することにより、高粘度の液体の一部を、トップシート５１から吸収体５３へ移行させやすくすることができる。 As described above, the non-woven fabric 10 of the present embodiment easily allows a high-viscosity liquid such as loose stool to permeate. Therefore, by applying it to the second sheet 52 of the diaper 1, a part of the high-viscosity liquid can be applied to the top sheet 51. Can be easily transferred to the absorber 53.
　＝＝＝その他の実施の形態＝＝＝
　以上、本発明の実施形態について説明したが、上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。また、本発明は、その趣旨を逸脱することなく、変更や改良され得るとともに、本発明にはその等価物が含まれるのはいうまでもない。例えば、以下に示すような変形が可能である。 === Other embodiments ===
Although the embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes an equivalent thereof. For example, the following modifications are possible.
　前述の実施形態の不織布１０では、顕在捲縮繊維１１が単一成分（例えばＰＥＴ）で形成されていたが、これには限られず、例えば、２成分の素材で形成されていてもよい。 In the non-woven fabric 10 of the above-described embodiment, the manifest crimp fibers 11 are formed of a single component (for example, PET), but the present invention is not limited to this, and for example, the material may be formed of two components.
　前述の実施形態のおむつ１は、吸収体５３よりも肌側に２枚のシート（トップシート５１及びセカンドシート５２）を備えており、セカンドシート５２に不織布１０を用いていたがこれに限られない。例えば、吸収体５３よりも肌側が１枚のシートのみであってもよい。この場合、当該シートに不織布１０を用いても良い。 The diaper 1 of the above-described embodiment is provided with two sheets (top sheet 51 and second sheet 52) on the skin side of the absorber 53, and the non-woven fabric 10 is used for the second sheet 52, but the present invention is limited to this. Absent. For example, there may be only one sheet on the skin side of the absorber 53. In this case, the non-woven fabric 10 may be used for the sheet.
１　パンツ型使い捨ておむつ（吸収性物品）
１Ａ　腹側胴回り部
１Ｂ　股間部
１Ｃ　背側胴回り部
１０　不織布
１１　顕在捲縮繊維
１２　円弧部
１３　円
２０　股下外装部
３０　前身頃部
３０ｅｓ　腹側サイド接合部
３０ｅｕ　上端
３１　腹側内層シート
３３　腹側外層シート
３３ｆ　折り返し部
３４　腹側胴回り弾性部材
３５　ウエスト弾性部材
３６　脚回り弾性部材
４０　後身頃部
４０ｅｓ　背側サイド接合部
４０ｅｕ　上端
４１　背側内層シート
４３　背側外層シート
４３ｆ　折り返し部
４４　背側胴回り弾性部材
４５　ウエスト弾性部材
４６　脚回り弾性部材
５０　吸収性本体
５１　トップシート（シート部材）
５１ａ　孔
５２　セカンドシート（不織布）
５３　吸収体
５３ａ　上層コア
５３ｂ　下層コア
５４　バックシート
ＢＨ　胴回り開口
ＬＨ　脚回り開口 1 Pants-type disposable diaper (absorbent article)
1A Ventral girth 1B Crotch 1C Dorsal girth 10 Non-woven fabric 11 Overt crimp fiber 12 Arc 13 Yen 20 Inseam exterior 30 Front body 30es Ventral side joint 30eu Upper end 31 Ventral inner layer sheet 33 Seat 33f Folded part 34 Ventral elastic member 35 Waist elastic member 36 Leg elastic member 40 Back body part 40es Back side joint 40 eu Upper end 41 Back inner layer sheet 43 Back outer layer sheet 43f Folded part 44 Back waist elastic member 45 Waist elastic member 46 Leg circumference elastic member 50 Absorbent body 51 Top sheet (seat member)
51a Hole 52 Second sheet (nonwoven fabric)
53 Absorbent 53a Upper core 53b Lower core 54 Back seat BH Girth opening LH Leg opening

Claims (12)

  1. 　吸収性物品に用いられる不織布であって、
    　複数の顕在捲縮繊維を含み、
    　１本又は複数本の前記顕在捲縮繊維で形成され、表面から視認可能な円弧部を、複数有し、
    　前記顕在捲縮繊維の平均繊維長をＬとし、前記円弧部上の三つの点を通る円の平均周長をＳとしたとき、
    　Ｓ≦２×Ｌ
    を満たすことを特徴とする不織布。     A non-woven fabric used for absorbent articles
    Contains multiple overt crimp fibers
    It is formed of one or more of the above-mentioned actual crimped fibers and has a plurality of arc portions that can be seen from the surface.
    When the average fiber length of the actual crimped fiber is L and the average peripheral length of the circle passing through the three points on the arc portion is S,
    S ≦ 2 × L
    A non-woven fabric characterized by satisfying.
  2. 　請求項１に記載の不織布であって、
    　Ｓ≦Ｌ
    をさらに満たすことを特徴とする不織布。     The non-woven fabric according to claim 1.
    S ≦ L
    A non-woven fabric characterized by further satisfying.
  3. 　請求項１又は２に記載の不織布であって、
    　前記顕在捲縮繊維同士が、接着剤により接合されている、
    ことを特徴とする不織布。     The non-woven fabric according to claim 1 or 2.
    The overt crimp fibers are bonded to each other with an adhesive.
    A non-woven fabric characterized by that.
  4. 　請求項３に記載の不織布であって、
    　前記円弧部の少なくとも一部は、前記接着剤により互いに接合された複数の前記顕在捲縮繊維により構成されている、
    ことを特徴とする不織布。     The non-woven fabric according to claim 3.
    At least a part of the arc portion is composed of a plurality of the apparent crimp fibers bonded to each other by the adhesive.
    A non-woven fabric characterized by that.
  5. 　請求項１から４のいずれか１項に記載の不織布であって、
    　前記顕在捲縮繊維の繊度が３０デニール未満である、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 4.
    The fineness of the overt crimped fiber is less than 30 denier.
    A non-woven fabric characterized by that.
  6. 　請求項１から５のいずれか１項に記載の不織布であって、
    　前記顕在捲縮繊維の含有量が８０重量％よりも大きい、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 5.
    The content of the overt crimp fibers is greater than 80% by weight.
    A non-woven fabric characterized by that.
  7. 　請求項１から６のいずれか１項に記載の不織布であって、
    　繊維密度が０．２ｇ／ｃｍ3以下である、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 6.
    Fiber density is 0.2 g / cm 3 or less,
    A non-woven fabric characterized by that.
  8. 　請求項１から７のいずれか１項に記載の不織布であって、
    　前記円の平均半径は、前記不織布の厚さよりも小さい、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 7.
    The average radius of the circle is smaller than the thickness of the non-woven fabric.
    A non-woven fabric characterized by that.
  9. 　請求項１から８のいずれか１項に記載の不織布であって、
    　前記表面において、複数の前記円で囲まれる円領域の合計面積よりも、前記円領域以外の領域の面積の方が広い、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 8.
    On the surface, the area of the area other than the circular area is larger than the total area of the circular area surrounded by the plurality of circles.
    A non-woven fabric characterized by that.
  10. 　請求項１から９のいずれか１項に記載の不織布であって、
    　前記吸収性物品は、
    　　　液体を吸収する吸収体と、
    　　　前記吸収体よりも肌側に設けられ、厚さ方向に貫通する孔を複数有するシート部材と、
    を備えており、
    　前記シート部材と前記吸収体との間に配置されている、
    ことを特徴とする不織布。     The non-woven fabric according to any one of claims 1 to 9.
    The absorbent article is
    Absorber that absorbs liquid and
    A sheet member provided on the skin side of the absorber and having a plurality of holes penetrating in the thickness direction,
    Is equipped with
    Arranged between the sheet member and the absorber,
    A non-woven fabric characterized by that.
  11. 　請求項１０に記載の不織布であって、
    　複数の前記円のうちの或る円は、前記シート部材の或る孔と少なくとも一部が重なっており、
    　別の円は、前記シート部材の前記孔と重なっていない、
    ことを特徴とする不織布。     The non-woven fabric according to claim 10.
    A circle of the plurality of circles overlaps at least a part of a hole of the sheet member.
    Another circle does not overlap the hole in the sheet member,
    A non-woven fabric characterized by that.
  12. 　液体を吸収する吸収体と、前記吸収体よりも肌側に設けられた不織布と、を備えた吸収性物品であって、
    　前記不織布は、
    　複数の顕在捲縮繊維を含み、
    　１本又は複数本の前記顕在捲縮繊維で形成され、表面から視認可能な円弧部を、複数有し、
    　前記顕在捲縮繊維の平均繊維長をＬとし、前記円弧部上の三つの点を通る円の平均周長をＳとしたとき、
    　Ｓ≦２×Ｌ
    を満たすことを特徴とする吸収性物品。     An absorbent article comprising an absorbent body that absorbs a liquid and a non-woven fabric provided on the skin side of the absorbent body.
    The non-woven fabric is
    Contains multiple overt crimp fibers
    It is formed of one or more of the above-mentioned actual crimped fibers and has a plurality of arc portions that can be seen from the surface.
    When the average fiber length of the actual crimped fiber is L and the average peripheral length of the circle passing through the three points on the arc portion is S,
    S ≦ 2 × L
    An absorbent article characterized by satisfying.
PCT/JP2020/040251 2019-12-27 2020-10-27 Non-woven fabric and absorbent article WO2021131302A1 (en)

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WO1997048846A1 (en) * 1996-06-19 1997-12-24 Chisso Corporation Nonwoven short fibre fabric and absorbent article made by using same
JPH1181116A (en) * 1997-09-08 1999-03-26 Chisso Corp Staple-fiber nonwoven fabric
JP2008264084A (en) * 2007-04-17 2008-11-06 Uni Charm Corp Non-woven fabric and absorbent article
JP2012211400A (en) * 2011-03-30 2012-11-01 Kuraray Co Ltd Heat expandable nonwoven fabric, and method for manufacturing bulky nonwoven fabric using the same
JP2014124896A (en) * 2012-12-27 2014-07-07 Seiko Epson Corp Liquid absorber, waste ink absorber, waste ink tank, droplet discharge device

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US5972505A (en) * 1989-04-04 1999-10-26 Eastman Chemical Company Fibers capable of spontaneously transporting fluids
EP3209260A1 (en) * 2014-10-24 2017-08-30 Basf Se Fluid-absorbent article
KR20180077801A (en) * 2016-12-29 2018-07-09 코오롱인더스트리 주식회사 Lyocell Fiber

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WO1997048846A1 (en) * 1996-06-19 1997-12-24 Chisso Corporation Nonwoven short fibre fabric and absorbent article made by using same
JPH1181116A (en) * 1997-09-08 1999-03-26 Chisso Corp Staple-fiber nonwoven fabric
JP2008264084A (en) * 2007-04-17 2008-11-06 Uni Charm Corp Non-woven fabric and absorbent article
JP2012211400A (en) * 2011-03-30 2012-11-01 Kuraray Co Ltd Heat expandable nonwoven fabric, and method for manufacturing bulky nonwoven fabric using the same
JP2014124896A (en) * 2012-12-27 2014-07-07 Seiko Epson Corp Liquid absorber, waste ink absorber, waste ink tank, droplet discharge device

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