JP2020031898A - Absorbent article - Google Patents

Abstract

To prevent leakage from around legs by making it hard for body fluid that flows along the skin to scatter around the legs.SOLUTION: In a surface sheet 3, a plurality of center ridge parts 10 and central groove parts 11 extending in the longitudinal direction are formed by turns in a width direction center area 20, and on both side areas 21 on both sides, a plurality of both side ridge parts 12 and both side groove parts 13 extending in the direction in which they tilt backward as they go inward in the width direction are formed by turns in the direction orthogonal to the center area. Both side ridge parts 12 are preferably formed in the way that projection height on the skin side becomes higher as they go outward in the width direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an absorbent article such as a disposable pad, a disposable diaper, a sanitary napkin, and a vaginal sheet, and more particularly to a plurality of strips extending in appropriate directions in a width direction central region and both side regions of a topsheet, respectively. The present invention relates to an absorbent article in which ridges and grooves are formed.

  Conventionally, in the above-mentioned absorbent article, there has been a problem that body fluids such as loose stool and urine flow on the topsheet and diffuse to the surroundings, so that leakage is likely to occur. Further, when the body fluid diffuses and comes into contact with the skin for a long time, there is a problem that dermatitis and rash are caused.

  Numerous improvements have been made to this type of absorbent article, and a product excellent in soft stool absorbency has been developed. For example, in Patent Document 1 below, a surface sheet, a permeable sheet, and an absorbing element are sequentially provided from the skin side, and the soft stool transmission speed S1 of the top sheet, the soft stool transmission speed S2 of the permeable sheet, and the soft stool transmission of the surface layer of the absorbing element. An absorbent article in which the speed S3 has a relationship of S1> S2> S3 is disclosed.

  Patent Document 2 below discloses a nonwoven fabric sheet having a plurality of ridges and grooves extending in a longitudinal direction on a first surface, wherein the nonwoven fabric sheet has a first fiber layer on a first surface side. And a second fiber layer on a second surface side opposite to the first surface, wherein the second fiber layer includes latently crimpable fibers, and the first fiber layer starts crimping of the latently crimpable fibers. A nonwoven fabric sheet is disclosed that includes a heat-fusible fiber that does not exhibit crimp at a temperature, and has a shape in which the ridge outer edge repeats meandering when the nonwoven fabric sheet is viewed in plan from the first surface side. .

JP 2006-141647 A JP 2011-208297 A

  However, in the absorbent article described in Patent Document 1, in a supine position, loose stool easily flows along the skin from the anus through the skin and around the base of the thigh, and loose stool collected around the legs is absorbed by the absorbent body. There is a problem that leakage from around the leg is apt to occur over the gather without being gathered. Further, in the above-mentioned Patent Document 2, loose stool is easily diffused along the direction in which the ridges and grooves extend, but there is a problem that it is difficult to capture loose stool flowing from the anus through the skin and around the legs. .

  Accordingly, a main object of the present invention is to provide an absorbent article that makes it difficult for body fluid flowing along the skin to diffuse around the legs and prevents leakage from around the legs.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a topsheet and a leakproof sheet,
In the width direction central region, a plurality of central ridge portions and central groove portions extending in the longitudinal direction are alternately formed in the width direction, and in both side regions on the both sides, the rear side is directed inward in the width direction. An absorptive article characterized in that a plurality of both side ridge portions and both side groove portions extending in the direction inclined in the direction are formed alternately in a direction perpendicular to the ridge portions.

  In the invention according to claim 1, a central ridge portion and a central groove portion extending in the longitudinal direction are formed in the central region in the width direction of the topsheet. Side ridges and side grooves extending in the direction inclined to the side are formed. Thereby, in the center region in the width direction, the bodily fluid is diffused along the longitudinal direction in which the furrow extends, and in the both side areas abutting around the leg, the bodily fluid flowing along the skin through the skin extends the furrow. It can be diffused toward the center in the width direction. For this reason, the body fluid flowing along the skin is unlikely to diffuse around the legs, and leakage from around the legs can be prevented.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the ridges on both sides are formed so that the height of the protrusion toward the skin gradually increases toward the outside in the width direction. You.

  According to the second aspect of the present invention, since the both side ridges are formed so as to protrude toward the skin gradually toward the outside in the width direction, the both side ridges function as barriers and travel along the skin. It becomes easier to block the flowing bodily fluid, and leakage from around the leg can be more reliably prevented.

  According to a third aspect of the present invention, there is provided the absorbent structure according to any one of the first and second aspects, wherein the central groove portion and the both side groove portions are provided with a large number of openings at intervals along the bottom of the groove portion. An article is provided.

  According to the third aspect of the present invention, by providing a large number of openings at the bottoms of the central groove and the side grooves, the body fluid can quickly pass through the openings to the lower surface side of the topsheet.

  According to a fourth aspect of the present invention, in the opening, an interval between openings between adjacent grooves is formed to be larger than an interval between adjacent openings along a direction in which the grooves extend. 3. An absorbent article according to item 3 is provided.

  According to the fourth aspect of the present invention, since the interval between the openings is larger in the interval between the adjacent grooves than in the direction in which the grooves extend, the body fluid is more easily diffused along the grooves. As a result, leakage from around the leg can be more reliably prevented.

  According to a fifth aspect of the present invention, as set forth in the third or fourth aspect, the opening formed in the central groove has a larger area than the opening formed in the both-side groove. A sexual article is provided.

  In the invention according to the fifth aspect, the opening formed in the central groove portion is formed with a relatively large area so that the body fluid collected in the central region in the width direction does not accumulate on the surface, so that the lower layer side is formed. It makes it easier for body fluids to pass through.

  The present invention according to claim 6, wherein a second sheet is disposed on the non-skin side of the top sheet, and the second sheet is formed in a ridge and groove shape together with the top sheet. An absorbent article is provided.

  In the invention according to claim 6, a second sheet is disposed on the non-skin side of the top sheet, and the second sheet is formed in a ridge shape together with the top sheet, so that the uneven shape can be firmly maintained. At the same time, the bodily fluid that has passed through the topsheet is likely to migrate to the non-skin side.

  According to a seventh aspect of the present invention, there is provided the absorbent article according to the sixth aspect, wherein the second sheet is formed such that the fiber density increases from the skin side to the non-skin side.

  In the invention according to claim 7, by increasing the fiber density in the thickness direction of the second sheet from the skin side to the non-skin side, loose stools or the like in which solids are mixed in the liquid can reduce the second sheet. In the process of passing from the skin side to the non-skin side, the solid matter and moisture are separated, the solid matter is captured by the second sheet, and moisture is absorbed by the absorber.

  As described in detail above, according to the present invention, the body fluid flowing along the skin is less likely to diffuse around the legs, and leakage from around the legs can be prevented.

FIG. 2 is a partially exploded development view of the disposable pad 1 according to the present invention. FIG. 2 is a view taken along line II-II in FIG. 1. FIG. 3 is a view taken along line III-III in FIG. 1. FIG. 3 is a plan view of the topsheet 3. FIG. 5 is a view taken along line VV of FIG. 4. (A) is a left side view, (B) is a longitudinal sectional view (a view taken along the line VI-VI in FIG. 4), and (C) is a right side view, showing both side ridge portions 12. FIG. 3 is a plan view showing an opening 14. It is sectional drawing (the II-II line arrow of FIG. 1) of the disposable pad 1 which concerns on a modification. It is sectional drawing (the II-II line arrow of FIG. 1) of the disposable pad 1 which concerns on a modification. It is a side view which shows the manufacturing apparatus of the topsheet 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Example of basic structure of disposable pad]
The disposable pad 1 is taken as an example of the absorbent article according to the present invention, and will be described in detail below. The disposable pad 1 is used as an inner of a pants-type or tape-type disposable diaper. In addition, it cannot be overemphasized that this invention can be applied not only to a disposable pad but to various absorbent articles, such as a disposable diaper and a sanitary napkin.

  As shown in FIGS. 1 to 3, the disposable pad 1 according to the present invention includes a leak-proof sheet 2 made of a polyethylene sheet or the like, a surface sheet 3 which forms a skin contact surface and allows urine and the like to pass through quickly. An absorber 4 interposed between these two sheets 2 and 3, an exterior sheet 5 covering the outermost surface (non-skin contact surface) of the disposable pad 1, and an approximately side edge portion of the absorber 4 standing upright And a pair of left and right three-dimensional gathers BS provided to protrude toward the skin in a predetermined section in the front-rear direction including at least the urination opening H and the anus K of the wearer, and gather sheets 6, 6 forming BS. In the periphery of the absorber 4, the outer edges of the top sheet 3, the second sheet 7 and the outer sheet 5 are formed of adhesive such as hot melt, heat seal, ultrasonic seal, etc. By the joining means The gather sheet 6 and the exterior sheet 5 extending laterally beyond the absorber 4 at both side edges thereof are joined by an adhesive such as hot melt or a joining means such as heat sealing or ultrasonic sealing. ing. It is preferable that the absorber 4 is surrounded by a wrapping sheet 8 made of crepe paper or nonwoven fabric as shown in the illustrated example, but the wrapping sheet 8 may not be provided.

  As the leak-proof sheet 2, a sheet material having at least water-blocking properties, such as polyethylene, is used. In recent years, a sheet having moisture permeability has been used from the viewpoint of preventing stuffiness. The water-impervious and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially. Sheets are preferably used. As the leak-proof sheet 2, a polylaminate nonwoven fabric in which a plastic film and a nonwoven fabric are laminated may be used.

The absorber 4 interposed between the leak-proof sheet 2 and the topsheet 3 is made of, for example, cotton-like pulp and a superabsorbent polymer. The superabsorbent polymer is mixed in the pulp constituting the absorber, for example, as a granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate, and softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. The basis weight of the absorbent body 4, 250~1200g / ^{m 2,} and it is preferably a 400-600 g / ^{m 2.}

  Further, synthetic fibers may be mixed in the absorber 4. The synthetic fibers may be, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof, and the like. It may be a mixture. In addition, composite fibers such as a core-sheath fiber, a side-by-side fiber, and a split fiber having a high melting point fiber as a core and a low melting point fiber as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a surface-treated synthetic fiber having a hydrophilic agent so as to have an affinity for a body fluid.

  The absorber 4 covers at least the skin side and the non-skin side of the absorber 4 with a wrapping sheet 8 made of crepe paper or non-woven fabric, as shown in the illustrated example, in order to maintain shape and improve diffusibility. Is preferred. When the wrapping sheet 8 that covers the absorber 4 is provided, the wrapping sheet 8 is interposed between the top sheet 3 and the absorber 4 as a result, and the wrapping sheet 8 is made of crepe paper. In this case, the body fluid is quickly diffused by the wrapping sheet 8 having excellent absorbability, and the body fluid absorbed by the absorber 4 is prevented from returning.

The exterior sheet 5 covers the leak-proof sheet 2 and makes the outer surface of the disposable pad 1 look and feel like a cloth. The exterior sheet 5 is preferably formed of a nonwoven fabric. As the material fiber, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. , A spun bond method, a thermal bond method, an air through method, a needle punch method, or the like. However, a long-fiber nonwoven fabric such as a spunbonded nonwoven fabric, an SMS nonwoven fabric, and an SMMS nonwoven fabric is preferable from the viewpoint that both touch and strength can be achieved.
A single nonwoven fabric can be used, or a plurality of nonwoven fabrics can be used in an overlapping manner. When a plurality of nonwoven fabrics are used, it is preferable that the nonwoven fabrics be fixed to each other via an adhesive such as hot melt. When a nonwoven fabric is used, the basis weight of the fiber is preferably 8 to 50 g / m ² , particularly preferably 10 to 30 g / m ² .

  By forming one or more temporary fixing layers (not shown) on the non-skin side surface (outer surface) of the exterior sheet 5, the disposable pad 1 is fixed to an underwear, a disposable diaper or the like when worn on the body. It may be. As the temporary fixing layer, a hook material of a mechanical bonding type may be used, or an adhesive may be used. The temporary fixing layer is provided as needed, and may not be particularly provided.

  On the other hand, in the illustrated example, the width dimension of the topsheet 3 is slightly longer than the width dimension of the absorber 4 as shown in the cross-sectional views of FIGS. Stopping, and the outer side of the gathering sheet 6 different from the topsheet 3, specifically, a water-repellent treatment appropriate for the purpose of preventing permeation of bodily fluids or enhancing the feeling of touch Alternatively, a gather sheet 6 made of a nonwoven fabric material subjected to a hydrophilic treatment is provided.

As the gather sheet 6, a sheet formed by using a natural fiber, a synthetic fiber, a regenerated fiber, or the like as a raw material by an appropriate processing method can be used. For this purpose, it is preferable to use a nonwoven fabric having a reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric having a basis weight of 8 to 23 g / m ² , and a silicon-based, paraffin-based, alkylchromic chloride-based water repellent or the like for reliably preventing permeation of body fluids. A water-repellent nonwoven fabric coated with is preferably used.

  The inner side portion of the gather sheet 6 is substantially double-folded, and one or a plurality of, in the illustrated example, two thread-like elastic elastic members 9 are provided inside the double sheet at an intermediate portion in the height direction. Reference numeral 9 is provided with both ends or appropriate positions in the longitudinal direction fixed. As shown in FIG. 3, the double sheet portion is adhered to the absorber 4 in a state where the double sheet portion is folded outward once and laminated, as shown in FIG. As shown in FIG. 2, in a predetermined section in the front-rear direction including the portion K, three-dimensional gathers BS, BS standing on the skin side are formed in a left-right pair.

[Surface sheet]
For the top sheet 3, a perforated or non-perforated nonwoven fabric or a porous plastic sheet is used. As the material fibers constituting the nonwoven fabric, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton, spun lace A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, and a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapability, and the thermal bond method is excellent in that it is bulky and has high compression recovery. When a large number of through-holes are formed in the topsheet 3, the bodily fluid is quickly absorbed, and the dry touch property is excellent. The fibers of the nonwoven fabric may be either long fibers or short fibers, but preferably short fibers are used to give the texture of the toweling. In addition, in order to facilitate the embossing treatment, it is preferable to use an olefin-based fiber such as polyethylene or polypropylene having a relatively low melting point. Also, a core-sheath type fiber having a high melting point fiber as a core and a low melting point fiber as a sheath, a side-by-side type fiber, or a split type fiber composite fiber can be suitably used.

  Moreover, it is preferable to use an elastic nonwoven fabric as the topsheet 3. The stretchable non-woven fabric means a non-woven fabric that elastically expands and contracts without the addition of an elastic stretch member, for example, a non-woven fabric manufactured by an air-through method or a thermal bond method, a non-woven fabric using crimped fibers, a styrene-based or urethane-based Nonwoven fabrics made of an elastomer represented by, for example, are preferred. The use of a stretchable nonwoven fabric as the topsheet 3 makes it easier to form the topsheet 3 in a ridge-and-groove shape as described later.

  As shown in FIGS. 4 and 5, the topsheet 3 has central ridges 10, 10,... Extending in the longitudinal direction and central grooves 11, 11,. A plurality of side ridges 12, 12 ... and both side grooves 13, 13 ... which extend in a direction inclined rearward toward the inside in the width direction are formed in both side regions 21, 21 on both sides thereof, respectively. A plurality are formed alternately in the orthogonal direction. Each of the ridge portions 10 and 12 is a portion where at least the topsheet 3 is formed in a cross-sectional shape that bulges toward the skin side while forming a space between the lower sheet member and the skin side, Each of the grooves 11 and 13 is a portion formed with a cross-sectional shape in which at least the topsheet 3 bulges in a dome shape toward the non-skin side. In the ridge structure including the central ridge portion 10 and the central groove portion 11 and the ridge groove structure including the both-side ridge portion 12 and the both-side groove portion 13, cross sections of the surface sheet 3 orthogonal to the direction in which these ridge groove structures extend. Visually, the topsheet 3 is formed in a wavy shape that repeats irregularities.

  The width direction center region 20 is a region formed over the entire length in the width direction center portion of the top sheet 3 in the width direction, and as shown in FIG. 1, the top sheet between the left and right gather sheets 6, 6 3 is provided within the width exposed to the surface and directly in contact with the skin surface, and is a region extending in the front-rear direction at the wearer's crotch portion when worn. The both side regions 21 are regions formed over the entire length in the longitudinal direction within the width from the side end of the width direction central region 20 to the width direction edge of the topsheet 3, and around the wearer's leg at the time of wearing. This is the region including the contacting part.

  It is preferable that the ridge structure including the central ridge portion 10 and the central groove portion 11 is formed in the entire width direction central region 20. In this case, the region where the central ridge portion 10 and the central groove portion 11 are formed can be defined as the width direction central region 20. On the other hand, the central ridge portion 10 and the central groove portion 11 can be formed in a part of the central region 20 in the width direction. Specifically, instead of being formed over the entire length in the longitudinal direction, it is formed at least in the intermediate portion in the longitudinal direction including the urination opening H and the anus K, and a ridge groove structure is provided on the front side and the rear side. It may not be provided.

  It is preferable that the ridge groove structure formed by the both side ridge portions 12 and the both side groove portions 13 is formed in a part of the both side regions 21 in a longitudinal direction. Specifically, it is an intermediate portion in the longitudinal direction, and is a longitudinal section in which the left and right three-dimensional gathers BS, BS stand toward the skin surface, that is, a longitudinal section in contact with the circumference of the wearer's leg. Preferably, it is formed in a longitudinal section including the anus K.

  The flow of the bodily fluid when the above-mentioned disposable pad 1 is attached will be described. As shown in FIG. 4, in the central region 20 in the width direction, the bodily fluid extends along the longitudinal direction in which the central ridge 10 and the central groove 11 extend. Is diffused, and at a portion where the both side regions 21 abut around the leg, the bodily fluid flowing along the leg along the skin is blocked by the both side ridge portions 12 and flows into the both side groove portions 13, It diffuses toward the center in the width direction in the direction in which the side groove portions 13 extend. In other words, in the supine position, urine discharged from the urination opening H or loose stool discharged from the anus K flows down the skin and diagonally to the rear, particularly from around the buttocks. Although the problem of leakage often occurred, in the disposable pad 1, urine and loose stool flowing along the skin toward the rear diagonal side are blocked by the ridge portions 12 extending in a direction substantially perpendicular to the flow direction. In addition to blocking the urine and loose stool, the blocked urine and loose stool can be diffused toward the center region 20 in the width direction along the side grooves 13. For this reason, the body fluid flowing along the skin is unlikely to diffuse around the legs, and leakage from around the legs can be prevented.

  In the ridge structure including the central ridge portion 10 and the central groove portion 11, the interval (pitch P1) between the top portions of the adjacent central ridge portions 10 and 10 is preferably 2 to 30 mm, and more preferably 3 to 15 mm.

  It is preferable to form three to ten central ridges 10 in the width direction central region 20. The central ridge portion 10 and the central groove portion 11 are each formed to have substantially the same width and substantially the same height over the entire length. The central grooves 11 are arranged on both sides in the width direction where the side ridges 12 and the side grooves 13 are connected so that the body fluid flowing inward in the width direction through the side grooves 13 easily flows into the center region 20 in the width direction. Is preferred.

  The projecting height of the central ridge portion 10 and the side ridge portions 12 is 1 to 5 mm, preferably 2 to 3 mm. The protruding height is a height from the bottom of each groove 11, 13 to the top of each ridge 10, 12. The protruding height of the central ridge 10 and the protruding height of the side ridges 12 may be substantially equal or may be different. Preferably, the protruding height of the side ridges 12 is higher than the protruding height of the central ridge 10. This makes it easier for the distal ends of the two side ridges 12 to adhere to the skin surface and to capture body fluid flowing along the skin, and that the body fluid in the center region 20 in the width direction adjoins beyond the central ridge 10. 11, and the diffusion of the bodily fluid along the specific central groove 11 along the longitudinal direction is suppressed.

  In the ridge structure formed by the side ridge portions 12 and the side groove portions 13, the interval (pitch P2) between the top portions of the adjacent side ridge portions 12, 12 is 2 to 20 mm, and preferably 3 to 10 mm. The pitch P2 may be equal to or different from the pitch P1 of the ridge structure formed in the center region 20 in the width direction. Preferably, the pitch P2 in the both side regions 21 is smaller than the pitch P1 in the center region 20 in the width direction. Thereby, more body fluid can be diffused along the longitudinal direction in the width direction central region 20, and the body fluid flowing along the skin with a fine pitch can be more reliably transmitted to the both ridge portions 12 in the both side regions 21. Can be captured. The pitch ratio at this time is preferably such that P1 / P2 is about 1.2 to 2.

  The direction in which the both-side ridges 12 and both-side grooves 13 extend is such that an angle α formed by a longitudinal line (a line parallel to the longitudinal center line CL) of the disposable pad 1 is 25 to 80 °, preferably 40 to 75 °. Good to do. By forming the body in this angle range, the body fluid flowing along the skin from the center in the width direction to the outside diagonally rearward can be more reliably captured in the lying posture of the wearer.

  The side ridges 12 and the side grooves 13 are preferably formed in an inclined straight line as shown in the illustrated example, but may be formed in a curved line bulging forward or rearward in the longitudinal direction.

  As shown in FIG. 6, it is preferable that the both side ridges 12 are formed so that the height of the protrusion toward the skin gradually increases toward the outside in the width direction. That is, it is preferable to form the topsheet 3 so that the height of the topsheet 3 gradually increases toward the skin side toward the outside in the width direction. As a result, the portion closer to the outer periphery of the leg in the width direction has higher adhesion to the skin surface, and the ridges 12 on both sides serve as barriers to easily block the body fluid flowing along the skin, and to prevent the body fluid from flowing around the leg. Leakage can be more reliably prevented. As for the ratio of the protruding heights, h1 / h2 is 0.2 to 0.8, preferably 0.5 to 0.5, where h1 is the height of the inner end in the width direction and h2 is the height of the outer end in the width direction. 7 is good.

  In order to gradually increase the protruding height of the side ridges 12 toward the outside in the width direction, the protrusions are provided on the peripheral surfaces of rolls (rolls 32 and 33 shown in FIG. 10) when forming the side ridges 12. This can be achieved by gradually increasing the heights of the convex portions and the concave portions toward the outside in the width direction.

  As shown in FIG. 4, it is preferable that the central groove portion 11 and the side groove portions 13 are provided with a large number of openings 14, 14,... At intervals along the bottom of each groove portion. The apertures 14 are preferably provided in a row at the center in the width direction of each groove along the longitudinal direction of the groove. By providing the opening 14, the bodily fluid can quickly pass through the opening 14 to the lower side of the topsheet 3, and the absorptivity of the bodily fluid flowing along the grooves 11, 13 can be improved.

  Although the plane shape of the opening 14 is arbitrary, it is preferable that the opening 14 is formed in a vertically long elliptical shape along the longitudinal direction of the groove as shown in FIG. This makes it easier for the bodily fluid flowing along the longitudinal direction of the groove to enter the opening 14 and also for the bodily fluid to flow along the longitudinal direction of the groove.

The size of the opening 14 is preferably large enough to allow solid matter contained in loose stool to pass through, and specifically, it is preferably 3 to 10 mm ² .

  As shown in FIG. 7, the opening 14 is formed such that the interval S2 between the adjacent openings is larger than the interval S1 between the adjacent openings along the direction in which each groove extends. Preferably, it is formed. That is, it is preferable that the interval S1 between the openings adjacent to each other along each groove is smaller than the pitch P1 or P2 in each region. This makes it easier for the bodily fluid to diffuse along the longitudinal direction of the groove where the distance between the openings is small, and makes it difficult for the bodily fluid to flow between adjacent grooves with a large distance.

  It is preferable that the opening 14 formed in the central groove 11 has a larger area than the opening 14 formed in the both-side groove 13. As a result, the body fluid diffused in the side groove portions 13 and collected in the center region 20 in the width direction does not accumulate on the surface, but passes through the opening 14 having a relatively large area formed in the center groove portion 11, thereby forming the lower layer side. It is easier to move to The ratio A1 / A2 of the area A1 of the opening 14 formed in the central groove 11 to the area A2 of the opening 14 formed in the both-side groove 13 is 1.2 to 3.0, preferably 1.5 to 3.0. 2.0 is preferable.

  In the present disposable pad 1, a second sheet 7 can be provided between the topsheet 3 and the absorber 4 adjacent to the non-skin side of the topsheet 3. The planar shape of the second sheet 7 is substantially the same as the top sheet 3. As the second sheet 7, for example, a perforated or non-perforated nonwoven fabric or a perforated plastic sheet can be used. As the fiber material constituting the nonwoven fabric, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and amides, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. The second sheet 7 may be constituted by one nonwoven fabric, or may be constituted by laminating a plurality of nonwoven fabrics. Further, as the second sheet 7, similarly to the top sheet 3, it is preferable to use a stretchable nonwoven fabric in order to easily form the above-mentioned ridge structure.

  As shown in FIG. 8, the second sheet 7 is preferably formed in a ridge and groove shape together with the top sheet 3. That is, in a state where the topsheet 3 and the second sheet 7 are laminated, the space sheet is formed between the topsheet 3 and the second sheet 7 by subjecting the topsheet 3 and the second sheet 7 to uneven processing integrally. It is preferable that the second sheet 7 is formed in a ridge shape along the ridge shape of the top sheet 3 without being formed. By arranging the second sheet 7 on the non-skin side of the topsheet 3 and forming this second sheet 7 in a ridge and groove shape together with the topsheet 3, the uneven shape of the topsheet 3 can be firmly maintained. In addition, the body fluid transmitted through the topsheet 3 is easily transferred to the non-skin side, and the body fluid absorbed by the absorber 4 is less likely to return to the skin side.

  The second sheet 7 is preferably formed such that the fiber density increases from the skin side to the non-skin side. By increasing the fiber density in the thickness direction of the second sheet 7 from the skin side toward the non-skin side, loose stools or the like in which solids are mixed in the liquid move the second sheet 7 from the skin side to the non-skin side. In the process of passing, when passing between fibers in which the fiber density gradually increases, solid matter and moisture can be separated, the solid matter can be captured by the second sheet 7, and the moisture can be absorbed by the absorber 4. become. To change the fiber density of the second sheet 7, one sheet of nonwoven fabric may be configured so that the fiber density gradually increases from the skin side to the non-skin side, High-woven fabrics may be laminated.

  In the case where the second sheet 7 has an action of separating solids such as loose stools and moisture as described above, the second sheet 7 does not have the opening 14 as provided in the top sheet 3. Is preferred. If an opening is formed in the second sheet 7, the solid matter easily passes through the opening, and the function of capturing the solid matter in the second sheet 7 may be reduced.

  On the other hand, the second sheet 7 may be formed of a flat non-woven fabric sheet as shown in FIG. Thereby, at the portion where the topsheet 3 is formed in a ridge groove shape, the bottom of the groove of the topsheet 3 is joined to the second sheet 7, and at the ridge of the topsheet 3, the topsheet 3 and the second sheet 7 are joined. 7, a space is formed.

  Next, a method of forming the topsheet 3 in a ridge shape among the manufacturing methods of the disposable pad 1 will be described. Other manufacturing methods are the same as the manufacturing method of a normal disposable pad. As shown in FIG. 10, the topsheet 3 includes a pin roll 30 having a plurality of pins corresponding to the openings 14 provided on a peripheral surface thereof, and a concave roll having a concave portion corresponding to the pins provided on the peripheral surface. 31, the holes 14 are formed, and after the second sheet 7 is laminated on the non-skin side as necessary, the concave portions corresponding to the central ridge portion 10 and the both side ridge portions 12 and A first roll 32 in which convex portions corresponding to the central groove portion 11 and the side groove portions 13 are formed on the peripheral surface, and convex portions and concave portions corresponding to the concave portions and convex portions of the first roll 32 are formed on the peripheral surface. By passing through the second roll 33, a ridge is formed.

  When the opening 14 is integrally formed in the top sheet 3 and the second sheet 7, the second sheet 7 is previously joined to the non-skin side of the top sheet 3, and a joined body of the top sheet 3 and the second sheet 7 is formed. May be passed between the pin roll 30 and the concave roll 31. When the second sheet 7 made of a flat nonwoven fabric is laminated on the non-skin side of the topsheet 3, the second sheet 7 is not laminated before passing between the first roll 32 and the second roll 33. After passing the top sheet 3 alone between the first roll 32 and the second roll 33, the second sheet 7 may be laminated.

  DESCRIPTION OF SYMBOLS 1 ... Disposable pad, 2 ... Leak-proof sheet, 3 ... Top sheet, 4 ... Absorbent, 5 ... Exterior sheet, 6 ... Gather sheet, 7 ... Second sheet, 8 ... Envelope sheet, 9 ... Thread elastic elastic member, 10 ... Central ridge, 11 ... Central groove, 12 ... Both ridges, 13 ... Both sides, 14 ... Opening, 20 ... Center area in the width direction, 21 ... Both sides

Claims (7)

In an absorbent article in which an absorber is interposed between a topsheet and a leakproof sheet,
In the width direction central region, a plurality of central ridge portions and central groove portions extending in the longitudinal direction are alternately formed in the width direction, and in both side regions on the both sides, the rear side is directed inward in the width direction. An absorbent article characterized in that a plurality of both side ridge portions and both side groove portions extending in a direction inclined in a direction are formed alternately in a direction orthogonal to the ridge portions.   2. The absorbent article according to claim 1, wherein the side ridges are formed such that the height of the protrusion toward the skin gradually increases toward the outside in the width direction. 3.   3. The absorbent article according to claim 1, wherein the central groove and the both-side grooves each have a large number of openings at intervals along the bottom of the groove.   4. The absorbent article according to claim 3, wherein the apertures are formed such that the distance between the adjacent holes along the direction in which the grooves extend is longer than the distance between the adjacent holes.   The absorbent article according to any one of claims 3 and 4, wherein an opening formed in the central groove has a larger area than an opening formed in the side grooves.   The absorbent article according to any one of claims 1 to 5, wherein a second sheet is provided on the non-skin side of the top sheet, and the second sheet is formed in a ridge shape together with the top sheet.   The absorbent article according to claim 6, wherein the second sheet is formed so that the fiber density increases from the skin side to the non-skin side.

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