WO2007148799A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2007148799A1 WO2007148799A1 PCT/JP2007/062629 JP2007062629W WO2007148799A1 WO 2007148799 A1 WO2007148799 A1 WO 2007148799A1 JP 2007062629 W JP2007062629 W JP 2007062629W WO 2007148799 A1 WO2007148799 A1 WO 2007148799A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- fibers
- nonwoven fabric
- side edge
- oriented
- Prior art date
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Classifications
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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
- 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
- A61F13/535—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
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- 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
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
-
- 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
- A61F13/45—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 shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
- A61F13/51108—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/2457—Parallel ribs and/or grooves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24595—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness and varying density
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24628—Nonplanar uniform thickness material
- Y10T428/24669—Aligned or parallel nonplanarities
Definitions
- the present invention relates to an absorbent article using a nonwoven fabric.
- non-woven fabrics are used in a wide range of fields such as sanitary products such as paper diapers and sanitary napkins, cleaning products such as wipers, and medical products such as masks.
- sanitary products such as paper diapers and sanitary napkins
- cleaning products such as wipers
- medical products such as masks.
- non-woven fabrics are used in various different fields, but when actually used in products in each field, they are manufactured to have properties and structures suitable for the use of each product. It is necessary.
- the nonwoven fabric is produced, for example, by forming a fiber layer (fiber web) by a dry method or a wet method, and bonding fibers in the fiber layer by a chemical bond method or a thermal bond method.
- the step of bonding fibers for forming a fiber layer includes a step of applying a physical force from the outside to the fiber layer, such as a method of repeatedly piercing a large number of needles into this fiber layer, a method of jetting water flow, etc. There is also a method.
- Patent Document 1 includes the following disclosure.
- the plurality of fiber layers made of fibers having different heat shrinkability, the upper first fiber layer, and the lower second fiber layer are partially heat-sealed in a predetermined pattern.
- the first fiber layer is partially raised by the heat shrinkage of the second fiber layer.
- the absorbent article As a surface sheet (top sheet) used for the skin contact surface of an absorbent article, the above-mentioned patent document When the non-woven fabric as shown in Appendix 1 is used, the absorbent article has the following problems with respect to the liquid repellency and liquid return suppression performance.
- the upper first fiber layer and the lower second fiber layer are heat-sealed in a predetermined pattern.
- the heat-sealing part is a concave part and is substantially formed into a film.
- the area ratio of the heat-sealed part is 11.5%.
- the menstrual blood dropped into the recessed portion which is a heat-sealed portion, temporarily accumulates in the recessed portion, and gradually moves into the top sheet from the portion other than the adjacent heat-sealed portion. For this reason, if some behavior change occurs while menstrual blood is accumulated in the recess, there is a concern that menstrual blood may overflow on the surface of the first fiber layer around the recess. Therefore, there is room for improvement, especially with regard to the liquid-making performance.
- the upper first fiber layer has a configuration in which it partially rises due to thermal contraction of the lower second fiber layer.
- the second fiber layer is composed of heat-shrinkable fibers having a high heat shrinkage rate, the second fiber layer becomes coiled by heat shrinkage. Therefore, heat is condensed while the surrounding fibers are involved, so that the second fiber layer is in a high density state where the fibers are gathered.
- region of a 2nd fiber layer is provided in the back surface side of a top sheet. Then, menstrual blood to be absorbed tends to stay in the high-density region where it is difficult to move from the high-density region to the lower absorption layer.
- menstrual blood that is excreted repeatedly stays in a high-density region on the back surface side of the top sheet, so that it takes a very long time to move to the lower absorption layer. For this reason, if some behavioral change occurs when menstrual blood is accumulated on the back side of the top sheet, there is a concern that menstrual blood may ooze out on the surface of the first fiber layer. Therefore, in particular, there is room for improvement in the liquid return suppression performance.
- the absorbent article uses a non-woven fabric having unevenness as a surface sheet (top sheet) used for the skin contact surface, and is required to have more comfortable performance.
- a surface sheet top sheet
- the ability to make a liquid that eliminates the discomfort of soiling or sticking the skin is achieved.
- the challenge is to improve return suppression performance.
- the present invention has been made in view of the above problems, and has an absorption having a nonwoven fabric that has irregularities on the surface, allows a liquid such as excrement to permeate, and is not easily crushed by external pressure or the like. It aims at providing a property article. Means for solving the problem
- the present inventors permeate liquid by spraying a gas from the upper surface side to a fiber web whose lower surface side force is also supported by a predetermined air-permeable support member to move the fibers constituting the fiber web. As a result, it was found that a non-woven fabric having irregularities could be produced immediately and the present invention was completed.
- a first sheet member that is at least partially liquid permeable, a second sheet member that is liquid impermeable, the first sheet member, and the second sheet member.
- An absorbent member disposed between the first sheet member and at least a part of the first sheet member formed on the first surface so as to extend in the first direction.
- a plurality of concave portions formed on the first surface so as to extend in the first direction, adjacent to the second direction perpendicular to the first direction in each of the plurality of convex portions.
- the side edge region of each of the plurality of convex portions has a fiber density that is substantially uniform in the thickness direction of the nonwoven fabric, and has a fiber density that is higher than the average fiber density in the convex portions.
- the central region having a thickness larger than the side edge region of each of the plurality of convex portions is Wherein with fiber density in the thickness direction of the nonwoven fabric is substantially uniform, lower than the average fiber density
- the absorbent article according to the first embodiment wherein the non-woven fabric is oriented along the first direction with respect to fibers constituting the non-woven fabric.
- Absorbent articles that have more.
- the absorbent article according to the second embodiment wherein any one of the plurality of recesses is adjacent to the other of the plurality of protrusions.
- a plurality of openings provided between the first protrusion and the second protrusion and formed at predetermined intervals along the first direction; and the first protrusion located between the plurality of openings.
- An absorbent article including a connecting portion connecting to the second convex portion, wherein the connecting portion has a larger amount of the second oriented fibers than the side edge region.
- each of the plurality of openings adjacent to each of the plurality of openings adjacent to the side edge region has a larger amount of the first oriented fiber than the connection, and each of the plurality of openings adjacent to the connection.
- each of the plurality of convex portions includes the central region.
- the absorbent article according to any one of the first to fifth embodiments, wherein an average of fibers constituting the bottom of each of the plurality of recesses
- the basis weight is an absorbent article that is lower than the average basis weight of the fibers constituting the central region in each of the plurality of convex portions.
- the absorbent article according to any one of the first to seventh embodiments, wherein the fluid is allowed to pass through the nonwoven fabric.
- a part of the fiber assembly is moved by spraying a fluid mainly composed of gas onto the fiber assembly in which the one side is supported by a support member having a state where the fiber has a degree of freedom. Accordingly, an absorbent article in which the plurality of concave portions and the plurality of convex portions are formed.
- the fiber density that is difficult to be crushed by an external pressure or the like even when the convex portion or the concave portion is formed is controlled without becoming extremely high, and a predetermined liquid such as excrement can be permeated immediately.
- An absorbent article having a nonwoven fabric capable of improving the liquid spreading performance and the liquid return inhibiting performance can be provided.
- FIG. 1 is a plan view of a sanitary napkin according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line F2-F2 in FIG.
- FIG. 3 is a plan view showing a first surface of a nonwoven fabric used for the top sheet member.
- FIG. 4 is a plan view showing a second surface opposite to the first surface in FIG.
- FIG. 5 is an enlarged perspective view of a region X in FIG.
- FIG. 6 is a perspective view of a fiber web.
- FIG. 7 is a diagram for producing the nonwoven fabric of FIGS. 3 to 5 supported by a mesh-like support member.
- FIG. 8 is a perspective view illustrating a nonwoven fabric manufacturing apparatus.
- FIG. 9 is a plan view showing a first surface of a nonwoven fabric used in the top sheet member of the sanitary napkin of FIG. 1 according to the second embodiment.
- FIG. 10 is a plan view showing a second surface opposite to the first surface in FIG. 9.
- FIG. 11 is an enlarged perspective view of a region Y in FIG.
- FIG. 12 is a view of the nonwoven fabric shown in FIGS. 9 to 11 produced by being supported by a breathable support member.
- FIG. 13 is a diagram showing an average result (evaluation) related to the evaluation procedure.
- FIG. 14 is a configuration diagram showing a disposable diaper as the absorbent article according to the third embodiment.
- FIG. 1 is a plan view of a sanitary napkin according to a first embodiment of the present invention.
- FIG. 2 is a sectional view taken along line F2-F2 in FIG.
- a sanitary napkin 501 as an absorbent article includes a liquid-permeable top sheet member 502, a liquid-impermeable back sheet member 504, a top sheet member 502, and a back sheet.
- the sanitary napkin 501 includes, in the longitudinal direction LD, a central part 506 including a contact area of a body excretion part, a front part 505 including a contact area of a front part of the body, and a contact area of a rear part of the body.
- the sanitary napkin 501 includes a pair of side sheets 508a and 508b along the longitudinal direction LD on both side edges of the top sheet member 502. At least a part of the side sheets 508a and 508b is disposed so as to cover a part of the top sheet member 502.
- the side sheets 508a and 508b may be provided with an embossed design (not shown).
- the sanitary napkin 501 overhangs a pair of wings 509a and 509b in the width direction WD.
- the wings 509a and 509b are provided with adhesive portions.
- the sanitary napkin 501 is attached to the underwear by, for example, folding the wings 509a and 509b toward the non-skin contact surface side and engaging the crotch portion of the underwear (not shown).
- the edge 510 of the front portion 505 of the sanitary napkin 501 has a curved shape that projects in both the longitudinal direction LD and the width direction WD.
- An edge 511 in the rear portion 507 of the sanitary napkin 501 has a curved shape that protrudes in both the longitudinal direction LD and the width direction WD.
- the longitudinal direction LD is an example of the first direction in the present invention, and is equivalent to the machine flow direction (MD) when the sanitary napkin 501 is manufactured.
- the width direction WD is an example of the second direction in the present invention, and is equivalent to the direction (CD) orthogonal to the machine flow direction (MD).
- the top sheet member 502 of the sanitary napkin 501 may be liquid permeable on the entire surface, or may be partly liquid permeable.
- a plurality of sheet members may be formed by joining a single sheet member.
- the top sheet member 502 includes a liquid permeable region between the joint portions of the side sheets 508a and 508b to the sanitary napkin 501 in the width direction WD of the sanitary napkin 501.
- the top sheet member 502 is provided with a leak-proof area 512.
- the leak-proof area 512 is an emboss pattern formed by embossing, for example, and a large pressing force is applied to the thickness direction TD of the sanitary napkin 501 so that the thickness of the absorbent member 503 is reduced.
- the pattern of the leak-proof area 512 is not limited.
- the sanitary napkin 501 configured as described above receives excretion such as menstrual blood by the top sheet member 502, permeates the top sheet member 502, and absorbs it by the absorbent member 503. Since the back sheet member 504 disposed on the non-skin contact surface side is liquid-impermeable, excrement does not permeate the non-skin contact surface side and is held in the state absorbed by the absorbent member 503. Is done. [0029] 1-2. Top sheet member
- FIG. 3 is a plan view showing the first surface 521 of the nonwoven fabric used for the top sheet member 502.
- FIG. 4 is a plan view showing a second surface 522 opposite to the first surface 521 in FIG.
- FIG. 5 is a partial enlarged perspective view showing the configuration of the nonwoven fabric corresponding to the region surrounded by X in FIG. 3 to 5 will be described with reference to FIGS. 1 and 2 as appropriate.
- the top sheet member 502 is composed of a liquid-permeable nonwoven fabric 110 in which a gap between fibers is formed.
- the nonwoven fabric 110 constituting the top sheet member 502 has a plurality of convex portions 2 formed to extend in the longitudinal direction LD on the first surface 521 on the skin contact surface side, and the plurality of convex shapes.
- Each of the portions 2 has a plurality of groove portions 1 adjacent to the width direction WD side and formed to extend in the longitudinal direction LD.
- the convex portion 2 is an example of a convex portion according to the present invention
- the groove portion 1 is an example of a concave portion according to the present invention.
- the second surface 522 on the side in contact with the absorbent member 503 is flatter than the first surface 521.
- Each of the plurality of convex portions 2 has a side edge region 8 and a central region 9 that is thicker than the side edge region 8 between the side edge regions 8.
- the side edge region 8 has a substantially uniform fiber density in the thickness direction TD of the nonwoven fabric 110, and has a fiber density higher than the average fiber density in the entire convex portion 2 including the side edge region 8 and the central region 9.
- the central region 9 has a substantially uniform fiber density in the non-woven fabric thickness direction TD, and has a fiber density lower than the average fiber density in the entire convex portion 2 including the side edge region 8 and the central region 9.
- the side edge regions 8 each have a substantially uniform fiber density in the thickness direction TD, and the central regions 9 each have a thickness direction TD. And the fiber density is substantially uniform. Therefore, menstrual blood passing through the plurality of convex portions 2 is smoothly transferred to the absorbent member 503 without accumulating on the second surface 522 side.
- the central region 9 has a low fiber density, a larger amount of menstrual blood passes than the side edge region 8 and is smoothly guided to the absorbent member 503.
- the side edge region 8 has a high fiber density but is not in the form of a film. Therefore, if the wearer feels a foreign object, the touch does not deteriorate.
- each of the plurality of convex portions 2 has a fiber density higher than that of the central region 9, the rigidity is high. For this reason, even when external pressure is applied to the convex portion 2, the central region 9 is supported by the highly rigid side edge regions 8 located on both sides of the central region 9. This The plurality of convex portions 2 are not easily crushed by external pressure or the like. In addition, the convex shape can be prevented from being crushed by the weight of the liquid contained in large quantities.
- the top sheet member 502 Since the convex portion 2 is not easily crushed by external pressure or the like, the air permeability through the groove portion 1 is particularly good. That is, the top sheet member 502 has excellent air permeability in the longitudinal direction LD. On the other hand, in the width direction WD, which is shorter than the length direction LD, the menstrual blood diffusion is suppressed by the convex region 2 and the fiber region at the bottom of the groove portion 1 continuous in the length direction LD. As a result, the top sheet member 502 is excellent in ability to prevent menstrual blood leakage of the absorbent article (sanitary napkin 501), and has a structure that ensures air permeability.
- the non-woven fabric 110 sprays a fluid mainly composed of gas onto a fiber assembly in which fibers supported on one surface side have a degree of freedom by a support member having a portion through which fluid can be passed, which will be described later.
- a plurality of grooves 1 and a plurality of convex portions 2 are formed by moving a part of the fibers of the fiber assembly.
- a plurality of groove portions 1 are formed in parallel at substantially equal intervals along the longitudinal direction LD on the first surface 521 side of the nonwoven fabric 110.
- the plurality of groove portions 1 are formed in parallel at substantially equal intervals, but the present invention is not limited to this, and the intervals between adjacent groove portions 1 may be different from each other. Good.
- a convex portion 2 is formed between two adjacent groove portions 1 and 1, respectively.
- the plurality of convex portions 2, 2 are formed in parallel at substantially equal intervals like the groove portion 1.
- the height (thickness direction TD) of the convex portions 2 of the nonwoven fabric 110 in this embodiment is substantially uniform.
- the heights of the convex portions 2 adjacent to each other are different from each other! ,.
- the height which is the distance in the thickness direction TD of the convex portion 2 in the nonwoven fabric 110 is 0.3 to 15 mm, preferably 0.5 to 5 mm.
- the length in the second direction perpendicular to the first direction (hereinafter also referred to as the horizontal direction or the width direction) per convex portion 2 is 0.5 to 30 mm, preferably 1.0 to 10 mm can be exemplified.
- the adjacent convex parts 2, 2 The distance between the vertices can be exemplified as 0.5 to 30 mm, preferably 3 to 10 mm.
- the height (distance in the thickness direction TD) of the non-woven fabric 110 in the region where the groove 1 is formed is 0 to 90%, preferably 1 to 50% with respect to the height of the convex portion 2. More preferably, a height of 5 to 20% can be exemplified.
- the width of the groove 1 can be exemplified by 0.1 force 30 mm, preferably 0.5 force 10 mm.
- the distance (pitch) between the adjacent groove portions 1 with the convex portion 2 interposed therebetween is 0.5 to 20 mm, preferably 3 to 10 mm.
- the nonwoven fabric 110 can be used even when a large amount of a predetermined liquid is excreted when used as a top sheet of an absorbent article. Hard to spread widely on the surface.
- the convex part 2 is crushed when excessive external pressure is applied, it is easy to maintain the space by the groove part 1, so that a predetermined liquid force S excretion is applied in the state where external pressure is applied. Even if it is applied, it is difficult to spread widely on the surface.
- the uneven surface is formed on the surface of the nonwoven fabric 110, so that the skin with a small contact area between the nonwoven fabric 110 and the skin is obtained. Widely difficult to reattach.
- a method for measuring the height, pitch, and width of the groove 1 or the convex portion 2 is as follows.
- the non-woven fabric 110 is placed on a table in a non-pressurized state, and the cross-sectional photograph or cross-sectional image force of the non-woven fabric 110 is also measured with a microscope.
- the sample nonwoven fabric 110 is cut so as to pass through the convex portion 2 and the groove portion 1.
- the shape of the convex portion 2 is not particularly limited.
- dome shape trapezoidal shape, triangular shape,
- Examples include ⁇ shapes and square shapes.
- the vicinity of the top surface and the side surface of the convex portion 2 are curved surfaces.
- the convex part 2 is crushed by external pressure.
- the convex portion 2 has a width narrowing toward the top surface as well as the bottom surface force.
- the shape of the convex portion 2 is preferably a curve (curved surface) such as a substantially dome shape.
- the fiber orientation of the nonwoven fabric 110 used for the top sheet member 502 will be described with reference to FIGS. 1 to 5 as appropriate.
- regions having different contents of fibers oriented in a predetermined direction are formed with respect to the constituent fibers 101 of the non-woven fabric 110. Examples of the different regions include the side edge region 8 and the central region 9 constituting the groove 1 and the convex portion 2 (see FIG. 3).
- the nonwoven fabric 110 includes a first oriented fiber that is oriented along the longitudinal direction LD and a second oriented fiber that is oriented along the width direction WD, with respect to the fibers constituting the nonwoven fabric 110, and includes a plurality of In each of the convex portions 2, the side edge region 8 has more first alignment fibers than the central region 9.
- the fibers constituting the bottom of each of the plurality of grooves 1 have more second oriented fibers than the fibers constituting the central region 9 of each of the plurality of convex portions 2.
- the central region 9 of each of the plurality of convex portions 2 has more fibers having a fiber orientation inclined in the thickness direction TD than the side edge region 8 of each of the plurality of convex portions 2.
- the state in which the first oriented fiber is oriented along the longitudinal direction LD means that the fiber 101 is sent by the nonwoven fabric or the fiber web through the machine in which the longitudinal direction LD, here the nonwoven fabric is manufactured. This means that the orientation is within the range of + 45 ° force — 45 ° with respect to the machine flow direction (MD). Further, fibers that are oriented along the longitudinal direction LD (fibers having fiber orientation close to the longitudinal direction LD) are called longitudinally oriented fibers. Therefore, the longitudinally oriented fiber is synonymous with the first oriented fiber.
- the state of being oriented along the width direction WD is the fiber 101 force width direction WD, here, the direction (CD) perpendicular to the machine flow direction (MD).
- the + 45 ° force also means the state of orientation within the range of -45 °.
- fibers that are oriented along the width direction WD are referred to as transversely oriented fibers. Accordingly, the laterally oriented fiber is synonymous with the second oriented fiber.
- the fiber having a fiber orientation inclined in the thickness direction TD means that the fiber 101 has a thickness in the range of + 75 ° to 75 °, more preferably in the range of + 45 ° to 45 ° with respect to the horizontal plane.
- the direction of the fiber is inclined so that it is oriented in the TD direction.
- the side edge region 8 has more fibers oriented along the longitudinal direction LD than the central region 9. Yes. That is, the fiber 101 in the side edge region 8 of the nonwoven fabric 110 has a higher content of longitudinally oriented fibers than the content of longitudinally oriented fibers in the central region 9 (the region sandwiched between the side edge regions 8 in the convex portion 2). Formed to be.
- the content of the longitudinally oriented fibers in the side edge region 8 may be 55 to 100%, and more preferably 60 to 100%.
- the side edge region 8 may be unnecessarily stretched due to line tension during manufacture.
- the groove portion 1 and the center region 9 described later are also extended by line tension, which may lead to shape destruction. That is, since the line tension during manufacturing is mainly applied to the side edge region 8 of the convex portion 2, the side edge region 8 is unnecessarily pulled by increasing the content of the longitudinally oriented fibers in the side edge region 8. Prevent it from being extended. As a result, the convex portion 2 is not easily collapsed by being stretched appropriately.
- the fibers constituting the bottom of each of the plurality of groove portions 1 in the nonwoven fabric 110 used for the top sheet member 502 are second oriented fibers as compared to the fibers constituting the central region 9 of each of the plurality of convex portions 2. That is, it has more laterally oriented fibers.
- the groove portion 1 is a region where a fluid (for example, hot air) mainly having a gas force is directly blown. For this reason, the longitudinally oriented fibers in the groove 1 are sprayed to the side edge region 8. Then, laterally oriented fibers remain in the groove 1. Therefore, in the groove part 1, the content of the horizontally oriented fibers is higher than the content of the longitudinal fibers.
- the content of longitudinally oriented fibers in the groove 1 is 10% or more lower than the content of longitudinally oriented fibers in the central region 9. Therefore, in the non-woven fabric 110, the groove portion 1 is a region where the content of the horizontally oriented fibers is the lowest and the content of the vertically oriented fibers is the lowest. Specifically, the content of laterally oriented fibers is 55 to 100%, preferably 60 to 100% It is. When the content of the horizontally oriented fibers is less than 55%, it is difficult to increase the strength of the nonwoven fabric in the width direction because the fiber basis weight of the groove 1 is low as described later. Then, for example, when the non-woven fabric 110 is used as a top sheet (surface sheet) of an absorbent article, the use of the absorbent article may cause distorting in the width direction or damage due to friction with the body. Sex occurs.
- the central region 9 of each of the plurality of convex portions 2 has more fibers inclined so as to be oriented in the thickness direction TD than the side edge region 8 of each of the plurality of convex portions 2.
- the central region 9 is a region sandwiched between the side edge regions 8 serving as both sides in the convex portion 2, and is a region in which the content of the longitudinally oriented fibers is lower than that of the side edge region 8.
- the central region 9 is preferably such that longitudinally oriented fibers and transversely oriented fibers are appropriately mixed.
- the content of longitudinally oriented fibers in the central region 9 is 10% or more lower than the content of longitudinally oriented fibers in the side edge region 8, and is less than the content of laterally oriented fibers at the bottom of the groove 1 described later. It is formed to be higher by 10% or more.
- the content of longitudinally oriented fibers in the central region 9 is preferably in the range of 40 to 80%. More preferably, the longitudinally oriented fibers and the transversely oriented fibers in the central region 9 are oriented in the thickness direction TD with respect to the horizontal plane in the range of + 75 ° to 75 °, more preferably in the range of + 45 ° to 45 °. It has more fibers that are inclined like this.
- the convex portion 2 depends on the rigidity of each fiber inclined so as to be oriented in the thickness direction TD. Becomes easy to return to the original thickness. In other words, it can be said to be a non-woven fabric with high compression recovery.
- each fiber that is inclined so as to be oriented in the thickness direction TD allows the liquid to pass through the convex portion 2 more smoothly.
- the fiber orientation was measured using a digital microscope VHX-100 manufactured by Keyence Corporation, and the following measurement method was used.
- the sample is set so that its longitudinal direction is an appropriate direction on the observation table.
- (2) Except for the fibers that protrude irregularly forward, focus the lens on the foremost fiber of the sample, and (3) set the shooting depth (depth) and display the sample 3D image on the PC screen. create.
- (4) convert the 3D image to a 2D image, and (5) draw parallel lines that divide the longitudinal direction in a timely manner in the measurement range. Draw several on the surface.
- the groove portion 1 is adjusted so that the fiber density is lower than that of the convex portion 2. Further, the fiber density of the groove 1 can be arbitrarily adjusted mainly by various conditions such as the amount of fluid (for example, hot air) and tension. The fiber density of the convex portion 2 is formed to be higher than the fiber density of the groove portion 1.
- the fiber density at the bottom of the groove 1 is not more than 0.18 gZcm 3 , preferably 0.002 force, etc. 0.18 gZcm 3 , particularly preferably 0.005 force, etc. 0.05 gZcm 3 . It can be illustrated.
- the fiber density at the bottom of the groove 1 is less than 0.002 gZcm 3 , for example, when the nonwoven fabric 110 is used as an absorbent article, the nonwoven fabric 110 is easily damaged. There is.
- the fiber density at the bottom of the groove 1 is larger than 0.18 gZcm 3 , the liquid may move downward and may stay in the groove 1 to give the user a feeling of wetness. .
- the convex portion 2 is adjusted so that the fiber density is higher than that of the groove portion 1. Further, the fiber density of the convex portion 2 can be arbitrarily adjusted mainly by various conditions such as the amount of fluid (for example, hot air) and tension.
- the fiber density of the central region 9 in the convex portion 2 is, for example, 0 force 0.20 gZcm 3 , preferably 0.005 force, etc. 0.20 g / cm 3 , more preferably 0.000 force, etc. 0 .
- Ru is a 07g / cm 3 in f Retsu ⁇ .
- the fiber density in the central region 9 is higher than 0.20 gZcm 3 , the liquid brought to the central region 9 is difficult to move downward, and the liquid stays in the central region 9 and the user accumulates. May give a feeling of dampness is there.
- the fiber density of the side edge region 8 in the convex portion 2 can be arbitrarily adjusted by various conditions such as the amount of fluid (eg, hot air) mainly composed of gas and tension.
- the fiber density of the side edge region 8 is exemplified by 0 to 0.40 gZcm 3 , preferably 0.007 force 0.25 g / cm 3 , more preferably 0.01 to 0.20 g / cm 3 . it can.
- the fiber density of the side edge region 8 is lower than 0.007 gZcm 3 , the side edge region 8 may be stretched by line tension.
- the fiber density of the side edge region 8 is higher than 0.40 gZcm 3 , the liquid brought to the side edge region 8 moves downward, and the liquid stays in the side edge region 8. May give the user a feeling of dampness.
- the average basis weight in the fibers of the nonwoven fabric 110 can be, for example, 10 to 200 gZm 2 , preferably 20 to lOOgZm 2 .
- topsheet When using the nonwoven fabric 110 in Toppushi over preparative absorbent article (topsheet), when the average fiber basis weight is lower than LOgZm 2 may the topsheet easily break during use.
- the average fabric weight of the nonwoven fabric 110 is higher than 200 gZm 2 , the liquid may be transferred downward.
- the groove 1 is adjusted so that the basis weight of the fiber 101 is lower than that of the convex portion 2. Further, the fiber basis weight at the bottom of the groove 1 is adjusted to be lower than the average basis weight of the fiber in the entire nonwoven fabric including the bottom of the groove 1 and the convex portion 2. Specifically, the fiber basis weight at the bottom of the groove 1 can be 3 to 150 g / m 2 , preferably 5 to 80 g / m 2 .
- the fiber basis weight at the bottom of the groove 1 is lower than 3 gZm 2 , if the nonwoven fabric 110 is used as a top sheet (surface sheet) of the absorbent article, the top sheet is easily damaged during use of the absorbent article There is. Further, when the fiber basis weight at the bottom of the groove 1 is higher than 150 gZm 2 , the liquid brought into the groove 1 is less likely to move downward, so that it stays in the groove 1 and makes the user feel wet. May give.
- the convex portion 2 is adjusted so that the average basis weight of the fiber 101 is higher than that of the groove portion 1.
- the fiber basis weight of the central region 9 in the convex portion 2 is, for example, 15 to 250 gZm 2 , and preferably 20 g is 120 gZm 2 .
- the fiber basis weight of the central region 9 is lower than 15 gZm 2
- the liquid contained in the central region 9 is not only easily crushed by its own weight or external pressure, but the liquid once absorbed is likely to return under pressure.
- the fiber basis weight in the central region 9 is higher than 250 gZm 2 , the resulting liquid is less likely to move downward, and the liquid may stay in the central region 9 to give the user a feeling of wetness. is there.
- the fiber basis weight of the side edge region 8 in the convex portion 2 can be arbitrarily adjusted by various conditions such as the amount of fluid (eg, hot air) mainly composed of gas and tension.
- the fiber basis weight of the side edge region 8 can be 20 to 280 gZm 2 , preferably 25 to 150 gZm 2 .
- the side edge region 8 may be stretched by line tension.
- the fiber basis weight of the side edge region 8 is higher than 280 gZm 2 , the liquid brought to the side edge region 8 migrates downward and stays in the side edge region 8, May give a damp feeling.
- the average basis weight of the entire fiber at the bottom of the groove 1 is adjusted to be lower than the average basis weight of the entire fiber of the convex portion 2 including the side edge region 8 and the central region 9.
- the fiber basis weight at the bottom of the groove portion 1 is 90% or less, preferably 3 to 90%, particularly preferably 3 to 70%, with respect to the average basis weight of the fibers in the convex portion 2.
- the average basis weight of the whole fiber at the bottom of the groove 1 is higher than 90% with respect to the average basis weight of the fiber at the convex part 2, the liquid dropped into the groove 1 is transferred to the lower side of the nonwoven fabric 110. Resistance may increase and liquid may overflow from groove 1.
- the nonwoven fabric is used as a top sheet (surface sheet) of the absorbent article. If used, the surface sheet may be easily damaged during use of the absorbent article.
- the top sheet having a structure like the nonwoven fabric 110 is used for the absorbent article, so that the groove portion 1 allows liquid to permeate and the convex portion 2 has a porous structure so that the liquid is retained. ⁇ ⁇ and ⁇ ⁇ .
- the bottom of the groove 1 is suitable for allowing liquid to pass through because the fiber density of the fiber 101 is lower than that of other regions and the basis weight is low. Furthermore, at the bottom of groove 1 Since the fibers 101 are oriented in the width direction WD, it is possible to prevent the liquid from flowing too much in the longitudinal direction of the nonwoven fabric 110 and spreading widely in the groove portion 1. In addition, since the fiber 101 is oriented in the width direction WD (CD orientation) in the groove portion 1, the nonwoven fabric 110 has a strength in the width direction WD (CD) even though the basis weight is lower than in other regions. Strength) increases.
- the convex portion 2 is adjusted so as to be higher than the other regions with respect to the fiber basis weight, but this increases the number of fibers, thereby increasing the number of fusion points and maintaining the porous structure.
- FIG. 6 is a perspective view of the fiber web.
- FIG. 7 is a view showing a state in which a nonwoven fabric as shown in FIGS. 3 to 5 is manufactured by spraying gas on the upper surface side in a state where the fiber web of FIG. 6 is supported by a net-like support member.
- FIG. 8 is a perspective view illustrating the nonwoven fabric manufacturing apparatus. With reference to these FIG. 6 to FIG. 8, a method for manufacturing the nonwoven fabric 110 used for the top sheet member 502 according to the absorbent article of the present invention will be described.
- the fiber web 100 is placed on the upper surface side of a net-like support member 210 that is a breathable support member.
- the fiber web 100 is supported from below by the mesh-like support member 210 (FIG. 7).
- the net-like support member 210 in a state where the fiber web 100 is supported that is, the air-permeable support member 200 is moved in a predetermined direction (F), and the fiber web 100 is moved.
- the non-woven fabric 110 according to this embodiment can be manufactured by continuously blowing gas on the upper surface side force.
- the net-like support member 210 as the air-permeable support member 200 is formed by weaving a plurality of wires 211 having a predetermined thickness that are non-venting portions.
- a plurality of wires 211 are woven at predetermined intervals, thereby obtaining a net-like support member in which a plurality of hole portions 213 that are ventilation portions are formed.
- the mesh-like support member 210 in FIG. 7 has a plurality of holes 213 with small pore diameters, and the gas blown from the upper surface side of the fiber web 100 hinders the mesh-like support member 210. It vents downward without being done. The net-like support member 210 does not change the flow of the blown gas, and the fibers 101 constituting the fiber web 100 are not moved downward.
- the fibers 101 constituting the fiber web 100 were sprayed mainly from the upper surface side. It is moved in a predetermined direction by gas. Specifically, since the downward movement of the mesh support member 210 is restricted, the fiber 101 moves in a direction along the surface of the mesh support member 210.
- the fiber 101 in the area where the gas is blown moves from the area to the area where the surrounding gas is not blown. Since the region where the gas is blown moves in a predetermined direction, a region where a continuous gas is blown in the predetermined direction is formed on the fiber web 100. As a result, the fiber 101 moves to a lateral region in the continuous region.
- the groove 1 is formed and the fibers 101 of the groove 1 are moved so as to be oriented in the width direction WD. Further, the convex portion 2 is formed between the two adjacent groove portions 1, 1, and the fiber density of the side portion of the convex portion 2 is increased, and the fiber 101 is oriented in the longitudinal direction LD.
- the nonwoven fabric manufacturing apparatus 90 for manufacturing the nonwoven fabric 110 of the present embodiment includes a breathable support member 200, a spraying portion 910, and a spraying means that also has an air supply portion force (not shown).
- the breathable support member 200 is configured to support the fiber web 100, which is a fiber assembly, also with one surface side force.
- the ejection unit 910 is configured to spray a fluid (hereinafter also simply referred to as a fluid) that mainly has a gas force from the other surface side of the fiber web 100 to the fiber web 100.
- the air supply unit is configured to send fluid to the ejection unit 910.
- the nonwoven fabric 110 is formed while the fiber web 100 is sequentially moved by the moving means.
- the moving means moves the fiber web 100 in a state in which one surface side force is supported by the air-permeable support member 200 in a predetermined direction.
- the fiber web 100 in a state in which a fluid mainly having a gas force is sprayed is moved in a predetermined direction F.
- An example of the moving means is a conveyor.
- the breathable support member 200 can be appropriately replaced depending on the nonwoven fabric to be manufactured.
- the above-described reticulated support member 210 can be used as the breathable support member 200.
- the description will be made assuming that the above-described mesh-like support member 210 is used as the air-permeable support member 200.
- the conveyor (not shown) is in a state where the fiber web 100 is supported by the lower surface side force.
- the mesh support member 210 is moved in a predetermined direction F (see FIG. 8). Specifically, the fiber web 100 is moved so as to pass below the jetting portion 910. Further, the fiber web 100 is moved so as to pass through the inside of a heater part (not shown) having both sides opened, which is a heating means of the fiber web 100.
- the spraying means includes an air supply unit (not shown) and an ejection unit 910.
- An air supply unit (not shown) is connected to the ejection unit 910 via an air supply tube 920.
- the air supply pipe 920 is connected to the upper side of the ejection part 910 so as to allow ventilation.
- the ejection portion 910 has a plurality of ejection ports 913 formed at predetermined intervals.
- the gas supplied from the air supply unit (not shown) through the air supply pipe 920 to the ejection unit 910 is ejected from a plurality of ejection ports 913.
- the gas ejected from the plurality of ejection ports 913 is continuously ejected to the upper surface side of the fiber web 100.
- the gas ejected from the plurality of ejection ports 913 is continuously ejected to the upper surface side of the fiber web 100 in a state where it is moved in the predetermined direction F by the conveyor.
- the intake portion 915 arranged below the ejection portion 910 and below the mesh-like support member 210 sucks in gas or the like ejected from the ejection portion 910 and ventilated through the mesh-like support member 210.
- the suction by the suction portion 915 may be strong enough to press the fiber 101 in the region where the fluid is sprayed against the mesh support member 210.
- sucking (inhaling) the fluid that has been sprayed by the air intake portion 915 the fluid that hits the air-impermeable portion of the air-permeable support member 200 (the wire 211 of the mesh-like support member 210) is rebounded and the fiber web 100 It is possible to prevent the shape from being disturbed. Further, it can be conveyed into a heater (not shown) in a state where the shape of the groove (unevenness) formed by the air flow is further maintained. In this case, the suction by the intake portion 915 is preferably performed until the fiber web 100 is conveyed to the heater portion.
- the fibers in the area where the fluid is sprayed are moved while being pressed against the mesh-like support member 210 side. Fiber will gather. Further, in the convex portion 2, the sprayed fluid collides with the non-venting portion of the breathable support member 200 (the wire 211 of the mesh-like support member 210). By being bounced back, the fiber 101 is partially in the thickness direction.
- the temperature of the fluid ejected from each of the ejection ports 913 may be normal temperature.
- at least the fiber assembly is configured.
- the temperature is higher than the softening point of the thermoplastic fiber, preferably higher than the softening point, and the melting point can be adjusted to a temperature of + 50 ° C to 50 ° C.
- the repulsive force of the fiber itself decreases, so if the shape of the fiber is rearranged by airflow or the like, or if the temperature is further increased immediately, heat fusion between the fibers will start. It becomes easy to maintain the shape of the groove (unevenness). Thereby, it becomes easy to convey into a heater part in the state which maintained shapes, such as a groove part (unevenness
- the shape of the convex portion 2 can be changed by adjusting the air volume and temperature of the fluid to be sprayed, the drawing amount, the air permeability of the mesh support member 210, the basis weight of the fiber web 100, and the like. For example, the amount of fluid to be sprayed and the amount of fluid to be sucked (intake) are almost equal, or the amount of fluid to be sucked (intake) is larger.
- the second surface side (back surface side) of the part 2 is formed so as to follow the shape of the mesh support member 210. Therefore, when the net-like support member 210 is flat, the second surface side (back surface side) of the nonwoven fabric 115 (nonwoven fabric 110) is substantially flat.
- the force to be transferred into the heater part, the groove part (irregularities) by hot air (air flow at a predetermined temperature), etc. can be cooled by cold air immediately after forming, and then transferred to the heater part.
- Both ends in the predetermined direction F of the heater unit, which is a heating means, are opened. Thereby, the fiber web 100 (nonwoven fabric 110) force placed on the mesh support member 210 is continuously moved in the heating space formed inside the heater with a stay for a predetermined time.
- the fiber 101 constituting the fiber web 100 (nonwoven fabric 110) includes thermoplastic fibers
- the nonwoven fabric 115 (nonwoven fabric 110) in which the fibers 101 are bonded to each other by heating in the heater portion is obtained. That's right.
- the general form is a sanitary napkin similar to the first embodiment. Therefore, the explanation is omitted. Omitted (see 1. General).
- FIG. 9 is a plan view showing a first surface 521 of a nonwoven fabric used for the top sheet member 502 in the sanitary napkin 501 of FIG. 1 according to the second embodiment.
- FIG. 10 is a plan view showing a second surface 522 opposite to the first surface 521 in FIG.
- FIG. 11 is a partial enlarged perspective view showing the configuration of the nonwoven fabric corresponding to the region surrounded by Y in FIG. 9 to 11 will be described with reference to FIGS. 1 and 2 as appropriate.
- the top sheet member 502 is composed of a liquid-permeable nonwoven fabric 120 in which voids between fibers are formed.
- the nonwoven fabric 120 constituting the top sheet member 502 is different from the nonwoven fabric 110 shown in the first embodiment in that the groove portion 1 includes a plurality of openings formed at predetermined intervals. That is, the groove portion 1 which is an example of the concave portion is provided between the adjacent convex portions (the first convex portion 2 and the second convex portion 2) of the plurality of convex portions 2, and is also elongated. It includes a plurality of openings 3 formed at predetermined intervals along the direction LD. Further, among the plurality of openings 3, the adjacent convex portions (the first convex portion 2 and the second convex portion are provided between the adjacent openings (first opening 3 and second opening 3). 2) There is a connecting part 4 that connects the two.
- Each side edge region 8 of each of the plurality of convex portions 2 has a substantially uniform fiber density in the thickness direction TD of the nonwoven fabric 120 and a fiber density higher than the average fiber density in the convex portions 2. .
- the central region 9 having a thickness greater than the side edge region 8 of each of the plurality of convex portions 2 has a substantially uniform fiber density in the thickness direction TD of the nonwoven fabric, and is larger than the average fiber density in the convex portion 2. Also has a low fiber density.
- longitudinally oriented fibers having a fiber orientation closer to the longitudinal direction LD than the connecting portions 4 are provided.
- the same operations and effects as in the first embodiment can be obtained. That is, menstrual blood that passes through the plurality of convex portions 2 is smoothly transferred to the absorbent member 503 without accumulating on the second surface 522 side.
- the central region 9 has a low fiber density, so the side edge region 8 A larger amount of menstrual blood passes and is smoothly guided to the absorbent member 503. Further, the side edge region 8 has a high fiber density but is not in the form of a film. Therefore, if the foreign body feels to the wearer, the touch will not be deteriorated.
- the groove portion 1 is suitable for transmitting liquid and solid. Furthermore, since the fibers 101 at the bottom of the groove 1 are oriented in the width direction WD, it is possible to prevent the liquid from flowing too much in the longitudinal direction LD of the groove 1 and spreading widely.
- each of the plurality of convex portions 2 has a fiber density higher than that of the central region 9, the rigidity is increased. For this reason, the plurality of convex portions 2 are supported by the respective side edge regions 8, and the convex shape is not easily crushed by external pressure or the like. In addition, the convex shape can be prevented from being crushed by the weight of the liquid contained in large quantities.
- any one of the longitudinally oriented fibers (first oriented fibers) and the laterally oriented fibers (second oriented fibers) is present at an arbitrary position in the peripheral portion of each of the plurality of openings 3. There are many. Thereby, the shape of the opening 3 is easily maintained.
- the nonwoven fabric 120 is supported on one surface side of a fiber assembly by a support member having a portion through which fluid can be passed, which will be described later, and the fibers constituting the fiber assembly have a degree of freedom.
- a fluid composed mainly of gas is sprayed onto the fiber assembly to move a part of the fibers of the fiber assembly, so that a plurality of groove portions 1, a plurality of convex portions 2, and a convex portion.
- a plurality of openings 3 included in 2 are formed.
- a plurality of groove portions 1 are formed in parallel at substantially equal intervals along the longitudinal direction LD on the first surface 521 side of the nonwoven fabric 120, and a plurality of openings 3 are formed in the groove portion 1. Is formed.
- Each of the plurality of openings 3 has a substantially elongated circular shape or a substantially elliptical shape.
- a substantially circular configuration is conceivable.
- the groove portions 1 are formed in parallel at substantially equal intervals.
- the present invention is not limited to this.
- the interval between the groove portions 1 that may be formed at different intervals varies. It may be formed as follows.
- the mouth portions 3 are formed at substantially equal intervals, but are not limited thereto, and may be formed at different intervals.
- each of the plurality of groove portions 1 and the plurality of convex portions 2 excluding the opening 3 in the nonwoven fabric 120 are the same as those of the nonwoven fabric 110 in the first embodiment, and thus the description thereof is omitted (1 2—See 1. Shape).
- a connecting portion 4 is formed so as to connect the convex portions 2 adjacent to the groove portion 1.
- a plurality of connecting portions 4 formed at a predetermined interval connect the convex portion 2 and the convex portion 2 adjacent thereto.
- the length in the longitudinal direction LD and the length in the width direction WD per opening 3 can be 0.1 to 5 mm, preferably 0.5 force and 4 mm.
- the pitch of the openings 3 adjacent to each other across the connecting portion 4 is 0.5 to 30 mm, preferably 1 to 10 mm.
- the height of the nonwoven fabric 120 in the connecting portion 4 in the thickness direction TD is equal to or less than the height in the thickness direction TD of the nonwoven fabric 120 of the convex portion 2, preferably 20 to 100%, more preferably 40. It can be illustrated that it is 70%.
- the length in the longitudinal direction LD and the length in the width direction WD of the nonwoven fabric 120 per one connecting portion 4 is 0.1 to 5 mm, preferably 0.5 to 4 mm. It can be illustrated.
- the pitch between the apexes of the connecting portions 4 that are adjacent to each other with the opening 3 interposed therebetween is 0.5 to 30 mm, preferably 1 to 10 mm.
- the cross-sectional shape in the longitudinal direction LD of the nonwoven fabric of the connecting portion 4 is a substantially square shape.
- the cross-sectional shape of the connecting portion 4 in the longitudinal direction LD is not limited to a substantially square shape, but may be a dome shape, a trapezoidal shape, a triangular shape, an ⁇ shape, or the like. However, in order to suppress the spread of the predetermined liquid in the groove portion 1, it is preferably a substantially quadrangular shape.
- the top surface of the connecting portion 4 is preferably a flat surface or a curved surface so that the connecting portion 4 does not come into contact with the skin or the like under an excessive external pressure to give a sense of foreign matter.
- the fiber orientation of the nonwoven fabric 120 used for the top sheet member 502 will be described with reference to FIG. 1 and FIGS. 9 to 11 as appropriate. Multiple openings excluding the periphery of opening 3 in nonwoven fabric 120 The details of the fiber orientation of each of the groove portion 1 and the plurality of convex portions 2 are the same as those of the nonwoven fabric 110 in the first embodiment, and thus the description thereof is omitted (see 1-2. Fiber orientation).
- the groove 1 is a region in which a fluid (for example, hot air) is directly blown and formed, and the opening 3 and the connecting portion 4 are formed.
- a fluid for example, hot air
- the sprayed portion is depressed in the thickness direction, and at the same time, the longitudinally oriented fiber oriented in the longitudinal direction LD in the sprayed portion is on the side edge region 8 side. Spouted. Further, the laterally oriented fibers oriented in the width direction WD by the fluid and the fluid whose direction of flow is changed by being sprayed on the non-venting part of the support member described later are jetted toward the connecting part 4 side.
- the fibers 101 in the connecting portion 4 of the groove 1 are oriented in the direction intersecting the longitudinal direction LD of the groove 1, specifically, in the width direction WD as a whole. Therefore, the fibers 101 at the periphery of the opening 3 are oriented along the shape of the opening.
- the connecting portion 4 of the groove portion 1 has the highest content of the horizontally oriented fibers with the lowest content of the vertically oriented fibers. Similar to the groove 1 in the nonwoven fabric 110 of the first embodiment, the connecting portion 4 of the groove 1 is formed so that the content of the horizontally oriented fibers is 55 to 100%, preferably 60 to 100%.
- the convex portion 2 is adjusted so that the average fiber density is higher than the average fiber density of the groove portion 1.
- Such adjustment of the fiber density is the same as in the first embodiment.
- the fiber density of the convex portion 2 can be arbitrarily adjusted according to various conditions such as the amount of fluid (for example, hot air) and tension.
- Examples of the fiber density of the connecting portion 4 in the groove portion 1 are 0.005 force 0.20 g / cm 3 , preferably 0.007 force and 0.1 lOgZcm 3 .
- the connecting part 4 may be crushed in the same manner when the convex part 2 is crushed due to excessive external pressure. is there.
- the nonwoven fabric 120 is formed such that the space area ratio measured also on the first surface 521 side force of the nonwoven fabric 120 is lower than the space area ratio measured from the second surface 522 side of the nonwoven fabric 120.
- the space area ratio refers to the ratio of the space area where no fiber is present to the total area.
- the measuring method of a space area ratio is as follows.
- the digital microscope VHX-100 manufactured by Keyence Corporation is used as the measuring instrument. First, (1) set the sample on the observation table so that the direction along the groove 1 and the convex part 2 is the vertical direction on the observation table, and (2) the convex part 2 at the apex of the convex part 2 The following measurement is made for the surface force on the opposite side of the surface from which the protrusion 2 protrudes and the surface from which the convex portion 2 protrudes.
- the magnification was 300 times
- the shooting depth was 220 m (1 shot every 20 m, 11 shots in total)
- n 10 measurements were taken, and the average value was taken.
- the space area ratio is calculated as follows.
- Spatial area ratio (%) (total space area (mm 2 ) Z measurement area (mm 2 )) X 100 where the total space area is calculated by (total space area during measurement Z magnification during measurement)
- the measurement range area can be calculated by (measurement range area at the time of measurement Z magnification at the time of measurement).
- the space area per space is the ratio of the total area of the space where there is no fiber relative to the number of spaces where there is no fiber within a predetermined range.
- the space area can be calculated using the following formula.
- the space area ratio measured on the surface force on the side from which the convex portion 2 protrudes is 50 to 100%, preferably 50 force to 90%, and more preferably 50 to 80%.
- the space area per space where the surface force on the side from which the convex portion 2 protrudes was also measured was 300.
- the average basis weight of the fibers of the entire nonwoven fabric 120 is the same as the average basis weight of the fibers of the entire nonwoven fabric 110 in the first embodiment. Further, the average fiber basis weight relationship between the convex part 2 and the groove part 1 is the same as that of the nonwoven fabric 110 in the first embodiment (see 1-2-4. Fiber unit basis).
- Fiber basis weight of the linking portion 4, 200GZm 2 to 5, preferably Ru can illustrate LOOgZm 2 to 10.
- the connecting part 4 may be crushed in the same manner when the convex part 1 is crushed due to excessive external pressure.
- the fiber basis weight of the connection part 4 is higher than 200 gZm 2 , the predetermined liquid dropped into the groove part 1 accumulates in the connection part 4, and an excessive external pressure is applied to the nonwoven fabric 120 to directly contact the skin. , May give a feeling of dampness.
- the sanitary napkin using the nonwoven fabric 120 according to the second embodiment as a top sheet member the sanitary napkin using the nonwoven fabric 110 according to the first embodiment as a top sheet member.
- the same effect as Napkin 501 can be obtained (see 1-2-5. Others).
- the groove 1 is suitable for allowing liquid and solid (such as fine particles) to pass therethrough.
- the opening 3 together with the connecting portion 4 oriented in the width direction WD can prevent the liquid from flowing too far in the longitudinal direction LD of the groove 1 and spreading widely.
- FIG. 12 is a view showing a state in which the nonwoven fabric as shown in FIGS. 9 to 11 is manufactured by blowing gas on the upper surface side in a state where the fiber web of FIG. 6 is supported by the air-permeable support member. .
- a method for manufacturing the nonwoven fabric 120 in the present embodiment will be described below with reference to FIGS. 6 and 8 as appropriate.
- the fiber web 100 of FIG. 6 is placed on the upper surface side of the support member 220 that is a breathable support member. In other words, the fiber web 100 is supported by the support member 220 from the lower side (second surface 522 side).
- the support member 220 in a state where the fiber web 100 of FIG. 6 is supported using the mechanism of FIG. 8 is used as the breathable support member 200. That is, the nonwoven fabric 120 in this embodiment is manufactured by moving the support member 220 in the predetermined direction (F) and continuously blowing the gas on the upper surface side force of the moved fiber web 100. Can do.
- the support member 220 is, for example, a fluid force sprayed from the upper surface side (first surface 521 side) of the fiber web 100 of Fig. 6.
- the support member 220 is opposite to the side on which the fiber web 100 is disposed.
- the lower part of the fiber web 100 and the fluid sprayed from the upper surface side of the fiber web 100 cannot be vented to the lower side of the support member 220, and the fibers 101 constituting the fiber web 100 are supported by the support member 220. And a non-ventilated portion that cannot move to the opposite side.
- the vent is a mesh hole 213 (see FIG. 12) formed by a predetermined mesh support member 210.
- the non-venting part include a configuration in which the elongated member 225 which is the non-venting part is arranged in parallel with the mesh support member 210 at equal intervals. The shape and arrangement of the elongated member 225 that is a non-venting portion can be changed as appropriate. Further, the non-venting part can also be formed by filling the hole part 213 by the mesh-like support member 210 which is the venting part (for example, by soldering or grease).
- Examples of the air permeability in the region serving as the ventilation part include 10000 force and 60000 ccZcm 2 'min, preferably 20000 to 50000 ccZcm 2 ' min.
- a ventilation part is formed by hollowing out a metal plate or the like as the air-permeable support member, the resistance to the plate part of the fluid disappears, and thus the air permeability exceeds the numerical value described above. There is a case.
- the net-like support member 210 and the elongated member 225 constituting the support member 220 regulate the movement of the fiber 101 to the lower surface side of the support member 220, so that the fiber 101 follows the upper surface of the support member 220. Moved in different directions.
- the gas blown to the elongated member 225 changes its flow in a direction along the elongated member 225.
- the gas whose flow has been changed in this manner causes the fibers 101 arranged on the upper surface of the elongated member 225 to move the upper surface force of the elongated member 225 to the surrounding region.
- the opening 3 having a predetermined shape is formed.
- one or more of the orientation, density, or basis weight of the fiber 101 is adjusted.
- a support member different from the support member 220 described above may be used.
- the size, arrangement, etc. of the groove portion 1, the convex portion 2, the opening portion 3 and the connecting portion 4 can be changed.
- a sanitary napkin that employs the configuration of the nonwoven fabric 120 of the second embodiment is used as the top sheet.
- two types of conventional sanitary napkins are used and the same evaluation as above is performed for comparison.
- the absorbent bodies covered with the top sheet in each sanitary napkin for evaluation and comparative evaluation shall have substantially the same performance.
- Rewetting rate (%) ⁇ (B-A) g / 10ml ⁇ X 100
- Fig. 13 shows the results of each average (measurement and calculation related to the series of evaluation procedures from 1) to 9b) were performed 5 times for each sanitary napkin for evaluation and comparative evaluation. It is a figure which shows (evaluation) (refer the ave column).
- the sanitary napkin of this embodiment for evaluation is a sanitary napkin that employs the configuration of the nonwoven fabric 120 of the second embodiment as described above. Compared with Comparative Examples 1 and 2, which are conventional sanitary napkins, the sanitary napkin of the present embodiment has a rewetting amount (0.27 g) and a rewetting rate (2.7%) for evaluating liquid return inhibition performance. As a result, the results were markedly superior, and a high evaluation was obtained.
- the non-woven fabric (120, 110, etc.) according to the present invention is used for the top sheet member 502 used for the skin contact surface of the sanitary napkin.
- excellent effects can be obtained in terms of liquid spreading performance and liquid return inhibition performance. That is, not only the first surface 521 side (skin side) of the top sheet member 502 but also the second surface 522 side (contact side with the absorber) can be quickly transferred to the absorber side where the liquid does not easily accumulate.
- the convex part is not easily crushed even when external pressure is applied, eliminating the discomfort that makes the skin dirty and sticky regardless of changes in the wearer's behavior and the amount of menstrual blood. obtain.
- FIG. 14 is a configuration diagram showing a disposable diaper as an absorbent article according to the present invention.
- a non-woven fabric 302 similar to the non-woven fabric 110 of the first embodiment is used as the top sheet member 603 in the absorbent member 602.
- other nonwoven fabrics similar to the nonwoven fabric 120 of the second embodiment may be used.
- Such a disposable diaper 601 can be expected to have the same functions and effects as described above.
- the liquid spreading performance and the liquid return suppressing performance are remarkably improved and the strength is high. It is possible to provide a non-woven fabric having unevenness that does not deteriorate the touch while being applied. Thereby, an absorbent article that can meet the demand for high performance can be provided. In particular, repeated menstrual force S is excreted It is possible to provide an absorbent article that can greatly eliminate the discomfort that makes the skin dirty or sticky when pressure is applied to contact with the skin, such as in the sitting position or when the behavior changes. .
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Textile Engineering (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Nonwoven Fabrics (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07767438.0A EP2034073B1 (en) | 2006-06-23 | 2007-06-22 | Absorptive article |
CN2007800227846A CN101473081B (zh) | 2006-06-23 | 2007-06-22 | 吸收性物品 |
KR1020087028357A KR101395379B1 (ko) | 2006-06-23 | 2007-06-22 | 흡수성 물품 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2006174505 | 2006-06-23 | ||
JP2006-174505 | 2006-06-23 | ||
JP2007-164511 | 2007-06-22 | ||
JP2007164511A JP5328113B2 (ja) | 2006-06-23 | 2007-06-22 | 吸収性物品 |
Publications (1)
Publication Number | Publication Date |
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WO2007148799A1 true WO2007148799A1 (ja) | 2007-12-27 |
Family
ID=38833536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/062629 WO2007148799A1 (ja) | 2006-06-23 | 2007-06-22 | 吸収性物品 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8304600B2 (ja) |
EP (1) | EP2034073B1 (ja) |
JP (1) | JP5328113B2 (ja) |
KR (1) | KR101395379B1 (ja) |
MY (1) | MY151019A (ja) |
WO (1) | WO2007148799A1 (ja) |
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US9156229B2 (en) | 2006-06-23 | 2015-10-13 | Unicharm Corporation | Multilayer nonwoven fabric and method of manufacturing the same |
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US11298260B2 (en) | 2016-07-19 | 2022-04-12 | Allegiance Corporation | Perineal thermal pack with improved liquid containment |
Also Published As
Publication number | Publication date |
---|---|
EP2034073A4 (en) | 2011-05-25 |
EP2034073A1 (en) | 2009-03-11 |
EP2034073B1 (en) | 2013-10-02 |
US20080045915A1 (en) | 2008-02-21 |
KR20090018059A (ko) | 2009-02-19 |
JP2008023326A (ja) | 2008-02-07 |
JP5328113B2 (ja) | 2013-10-30 |
US8304600B2 (en) | 2012-11-06 |
KR101395379B1 (ko) | 2014-05-14 |
MY151019A (en) | 2014-03-31 |
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