JP7102290B2 - Absorbent article - Google Patents

Description

The present invention mainly relates to absorbent articles such as disposable pads, disposable diapers, menstrual napkins, and pantyliner sheets, and in particular, a plurality of strips extending in appropriate directions in the central region in the width direction and the bilateral regions of the surface sheet. The present invention relates to an absorbent article in which a ridge and a groove are formed.

Conventionally, the above-mentioned absorbent article has a problem that body fluids such as loose stool and urine flow on the surface sheet and diffuse to the surroundings, and leakage is likely to occur. In addition, if the body fluid diffuses and comes into contact with the skin for a long time, there is a problem that it causes dermatitis or rash.

Many improvements have been made to this type of absorbent article, and one with excellent absorbability of loose stool has been developed. For example, in Patent Document 1 below, a surface sheet, a permeation sheet, and an absorbent element are provided in this order from the skin side, the loose stool permeation rate S1 of the surface sheet, the loose stool permeation rate S2 of the permeation sheet, and the loose stool permeation of the surface layer of the absorption element. Absorbent articles are disclosed in which the velocity S3 has a relationship of S1> S2> S3.

Further, in Patent Document 2 below, a non-woven fabric sheet in which a plurality of ridges and grooves extending in the longitudinal direction are formed on the first surface, and the non-woven fabric sheet is the first fiber layer on the first surface side. And a second fiber layer on the second surface side opposite to the first surface, the second fiber layer contains latent crimp fibers, and the first fiber layer starts to crimp the latent crimp fibers. Disclosed is a non-woven fabric sheet containing heat-sealing fibers that do not develop crimping at temperature and having a shape in which the outer edge of the ridge is repeatedly meandering when the non-woven fabric sheet is viewed in a plan view from the first surface side. ..

Japanese Unexamined Patent Publication No. 2006-141647 Japanese Unexamined Patent Publication No. 2011-208297

However, in the absorbent article described in Patent Document 1, loose stools easily flow from the anus to the base of the thighs around the legs in the supine position, and the loose stools accumulated around the legs are absorbed by the absorber. There was a problem that leakage from around the legs was likely to occur beyond the gathers. Further, in the case described in Patent Document 2, loose stools tend to diffuse along the direction in which the ridges and grooves extend, but there is a problem that it is difficult to catch loose stools flowing from the anus to the skin and around the legs. ..

Therefore, 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 surface sheet and a leak-proof sheet.
In the surface sheet, a plurality of central ridges and central grooves extending in the longitudinal direction are alternately formed in the central region in the width direction in the width direction, and the rear side of the surface sheet is formed in both side regions on both sides thereof inward toward the inside in the width direction. Provided is an absorbent article characterized in that a plurality of bilateral ridges and bilateral grooves extending in a direction inclined toward the surface are alternately formed in a direction orthogonal to the ridges on both sides.

In the invention according to claim 1, the central region in the width direction of the surface sheet is formed with a central ridge portion and a central groove portion extending in the longitudinal direction, and both side regions thereof are rearward as they are directed inward in the width direction. Both side ridges and both side grooves extending in a direction inclined to the side are formed. As a result, in the central region in the width direction, the body fluid is diffused along the longitudinal direction in which the ridge groove extends, and in the bilateral region that abuts around the leg, the body fluid that has flowed along the skin and around the leg extends the ridge groove. It can be diffused toward the center of the width direction. Therefore, the body fluid flowing along the skin is less likely to diffuse around the legs, and leakage from around the legs can be prevented.

According to the second aspect of the present invention, there is provided the absorbent article according to claim 1, wherein the ridges on both sides are formed so that the protruding height toward the skin gradually increases toward the outside in the width direction. To.

In the invention according to claim 2, since the ridges on both sides are formed so as to gradually protrude higher toward the skin toward the outside in the width direction, the ridges on both sides serve as a barrier and travel through the skin. It becomes easier to block the flowing body fluid and more reliably prevent leakage from around the legs.

The absorbency according to claim 3, wherein a large number of holes are provided in the central groove portion and the both side groove portions at intervals along the bottom portion of the groove portions, respectively. Goods are provided.

In the invention according to claim 3, by providing a large number of openings at the bottoms of the central groove and the groove on both sides, the body fluid can quickly pass the surface sheet to the lower layer side through the openings.

According to a fourth aspect of the present invention, the openings are formed so that the distance between the openings adjacent to each other is larger than the distance between the openings adjacent to each other along the direction in which the groove extends. The absorbent article according to 3 is provided.

In the invention according to claim 4, since the distance between the openings is larger than the distance between the adjacent grooves in the direction in which the grooves extend, the body fluid is more likely to diffuse along the groove. Therefore, leakage from around the legs can be prevented more reliably.

The absorption according to claim 5, wherein the opening formed in the central groove has a larger area than the opening formed in the groove on both sides. Sexual goods are provided.

In the invention according to claim 5, the opening formed in the central groove portion is formed in a relatively large area so that the body fluid collected in the central region in the width direction does not collect on the surface, thereby forming the lower layer side. It makes it easier for body fluids to pass through.

The present invention according to claim 6, wherein a second sheet is arranged on the non-skin side of the surface sheet, and the second sheet is formed in a ridge shape together with the surface sheet according to any one of claims 1 to 5. Absorbent articles are provided.

In the invention according to claim 6, the second sheet is arranged on the non-skin side of the surface sheet, and the second sheet is formed in a ridge shape together with the surface sheet so that the uneven shape can be firmly retained. At the same time, the body fluid that has permeated the surface sheet is likely to move to the non-skin side.

As the present invention according to claim 7, the second sheet is provided with the absorbent article according to claim 6, which is formed so 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 stool or the like in which solid matter is mixed in the liquid makes the second sheet. In the process of passing from the skin side to the non-skin side, the solid matter and the moisture are separated, the solid matter is captured by the second sheet, and the 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.

It is a partially broken development view of the disposable pad 1 which concerns on this invention. FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. It is a top view of the surface sheet 3. It is a VV line arrow view of FIG. Both side ridges 12 are shown, (A) is a left side view, (B) is a longitudinal sectional view (VI-VI line arrow view of FIG. 4), and (C) is a right side view. It is a top view which shows the opening 14. FIG. 5 is a cross-sectional view of the disposable pad 1 according to the modified example (viewed by arrow II-II in FIG. 1). FIG. 5 is a cross-sectional view of the disposable pad 1 according to the modified example (viewed by arrow II-II in FIG. 1). It is a side view which shows the manufacturing apparatus of the surface sheet 3.

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

[Example of basic structure of disposable pad]
As an example of the absorbent article according to the present invention, a disposable pad 1 will be taken as an example and will be described in detail below. The disposable pad 1 is used as an inner for a pants-type or tape-type disposable diaper. Needless to say, the present invention is not limited to disposable pads, but can be applied to various absorbent articles such as disposable diapers and menstrual napkins.

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 or the like to quickly permeate. The absorber 4 interposed between the two sheets 2 and 3, the exterior sheet 5 covering the outermost surface (non-skin contact surface) of the disposable pad 1, and the substantially side edge portion of the absorber 4 stand up at the base end. And at least a pair of left and right three-dimensional gather BSs, and gather sheets 6 and 6 forming the BS, which are provided so as to project toward the skin in a predetermined section in the anterior-posterior direction including the urinary opening H and the anal K of the wearer. Around the absorber 4, the outer edges of the surface sheet 3, the second sheet 7, and the exterior sheet 5 are hot-melt adhesives, heat seals, ultrasonic seals, etc. The gather sheet 6 and the exterior sheet 5 are joined by the joining means of the above, and at both side edges thereof, the gather sheet 6 and the exterior sheet 5 extending laterally from the absorber 4 are joined by an adhesive such as hot melt, a heat seal, an ultrasonic seal, or the like. Joined by. The absorber 4 is preferably surrounded by an encapsulating sheet 8 made of crepe paper, non-woven fabric, or the like as shown in the illustrated example, but the encapsulating sheet 8 may not be provided.

As the leak-proof sheet 2, a sheet material having at least water-shielding property such as polyethylene is used, but in recent years, a sheet material having moisture permeability has tended to be used from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties 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 in a uniaxial or biaxial direction. Sheets are preferably used. As the leak-proof sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

The absorber 4 interposed between the leak-proof sheet 2 and the surface sheet 3 is composed of, for example, cotton-like pulp and a super absorbent polymer. The super absorbent polymer is mixed in the pulp constituting the absorber, for example, as a granular powder. Examples of the pulp include cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. The basis weight of the absorber 4 is preferably 250 to 1200 g / m ² , preferably 400 to 600 g / m ² .

Further, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, for example, a polyolefin-based fiber such as polyethylene or polypropylene, a polyester-based fiber such as polyethylene terephthalate or polybutylene terephthalate, a polyamide-based fiber such as nylon, and a copolymer thereof can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

As shown in the illustrated example, the absorber 4 covers at least the skin side surface and the non-skin side surface of the absorber 4 with an encapsulating sheet 8 made of crepe paper, non-woven fabric, or the like in order to maintain the shape and improve diffusivity. Is preferable. When the encapsulating sheet 8 covering the absorber 4 is provided, as a result, the encapsulating sheet 8 is interposed between the surface sheet 3 and the absorber 4, and the encapsulating sheet 8 is made of crepe paper. In this case, the body fluid is rapidly diffused by the encapsulating 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 non-woven fabric. As the material fiber, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used, and the processing method is the spunlace method. , Span bond method, thermal bond method, air through method, needle punch method, etc. can be used for production. However, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are preferable from the viewpoint of achieving both touch and strength.
In addition to using one non-woven fabric, a plurality of non-woven fabrics can be used in layers. When a plurality of non-woven fabrics are used in layers, it is preferable to fix the non-woven fabrics to each other via an adhesive such as hot melt. When a non-woven fabric is used, the fiber basis weight is preferably 8 to 50 g / m ² , and 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 underwear, disposable diapers, etc. when attached to the body. You may do it. As the temporary fixing layer, a mechanically bonded hook material may be used, or an adhesive may be used. The temporary fixing layer is provided as needed and does not have to be provided in particular.

On the other hand, in the illustrated example, the width dimension of the surface sheet 3 is slightly longer than the width dimension of the absorber 4, as shown in the cross-sectional views of FIGS. 2 and 3, and only covers the absorber 4. On the outer side of the stop, a gather sheet 6 different from the surface sheet 3, specifically, an appropriate water-repellent treatment for the purpose of preventing permeation of body fluids or enhancing the feel of the skin. Alternatively, a gather sheet 6 made of a non-woven fabric material that has been subjected to a hydrophilic treatment is arranged.

As the gather sheet 6, a material formed of natural fiber, synthetic fiber, recycled fiber or the like by an appropriate processing method can be used, but preferably, the feeling of stiffness is eliminated and stuffiness is prevented. Therefore, it is preferable to use a non-woven fabric having a low basis weight and having air permeability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 8 to 23 g / m ² , and in order to reliably prevent the permeation of body fluids, silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A water-repellent treated non-woven fabric coated with is preferably used.

The inner side portion of the gather sheet 6 is substantially double-folded, and one or more filamentous elastic elastic members 9 in the middle portion in the height direction of the double sheet, in the illustrated example. 9 is arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. As shown in FIG. 3 at the front and rear ends, this double sheet portion is adhered to the absorber 4 side in a state where it is folded back once and laminated to the outside, so that at least the urination port H and the anus of the wearer are formed. As shown in FIG. 2, three-dimensional gather BSs and BSs standing on the skin side are formed in pairs on the left and right within a predetermined section in the front-rear direction including the portion K.

[Surface sheet]
As the surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the surface sheet 3, the body fluid is rapidly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

Further, it is preferable to use a stretchable non-woven fabric as the surface sheet 3. The stretchable non-woven fabric means a non-woven fabric that elastically expands and contracts without the addition of an elastic stretchable member. For example, a non-woven fabric manufactured by an air-through method or a thermal bond method, a non-woven fabric using crimp fibers, a styrene-based or urethane-based fabric. A non-woven fabric made of an elastomer typified by the above is preferable. By using the stretchable non-woven fabric as the surface sheet 3, the surface sheet 3 can be easily formed into a ridge shape as described later.

In the surface sheet 3, as shown in FIGS. 4 and 5, central ridges 10, 10 ... Extending in the longitudinal direction and central grooves 11, 11 ... Alternately in the width direction in the central region 20 in the width direction. A plurality of both side ridges 12, 12 ... And both side groove portions 13, 13 ... A plurality of them are alternately formed in orthogonal directions. Each of the ridges 10 and 12 is a portion where at least the surface sheet 3 is formed in a cross-sectional shape in which at least the surface sheet 3 bulges in a dome shape toward the skin side while forming a space portion between the ridges 10 and 12 and the member on the lower layer side. Each of the grooves 11 and 13 is a portion formed in a cross-sectional shape in which at least the surface sheet 3 bulges in a dome shape toward the non-skin side. In the ridge structure composed of the central ridge portion 10 and the central groove portion 11 and the ridge groove structure composed of the both side ridge portions 12 and the both side groove portions 13, the cross section of the surface sheet 3 orthogonal to the direction in which these ridge groove structures extend, respectively. Visually, the surface sheet 3 is formed in a wavy shape with repeated irregularities.

The width direction central region 20 is a region formed over the entire length in the longitudinal direction in the width direction central portion of the surface sheet 3, and as shown in FIG. 1, the surface sheet between the left and right gather sheets 6 and 6 is formed. 3 is a region that is provided within a width that is exposed on the surface and comes into direct contact with the skin surface, and extends the crotch portion of the wearer in the front-rear direction when worn. The both side regions 21 are regions formed in the width from the side end of the width direction central region 20 to the width direction edge edge of the surface sheet 3 over the entire length in the longitudinal direction, and are around the wearer's legs when worn. It is an area including a contact portion.

The ridge structure formed by the central ridge portion 10 and the central groove portion 11 is preferably formed in the entire width direction central region 20. In this case, the region in which the central ridge portion 10 and the central groove portion 11 are formed can be defined as the widthwise central region 20. On the other hand, the central ridge portion 10 and the central groove portion 11 can also be formed in a part of the central region 20 in the width direction. Specifically, it is not formed over the entire length in the longitudinal direction, but is formed in the middle portion in the longitudinal direction including at least the urination port H and the anus K, and a ridge structure is formed on the anterior and posterior sides thereof. It may not be provided.

The ridge groove structure formed by the ridges 12 on both sides and the groove 13 on both sides is preferably formed in a part of the regions 21 on both sides in the 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 gathered BSs and BSs stand up toward the skin surface, that is, a longitudinal section that abuts around the wearer's legs, and is at least the wearer's. It is preferably formed in the longitudinal section including the anal portion K.

Explaining the flow of body fluid when the disposable pad 1 is attached, as shown in FIG. 4, in the central region 20 in the width direction, the body fluid is extended along the longitudinal direction in which the central ridge portion 10 and the central groove portion 11 extend. At the site where the bilateral regions 21 abut around the legs, the body fluid that has flowed around the legs along the skin is blocked by the ridges 12 on both sides and flows into the grooves 13 on both sides. The groove portions 13 on both sides diffuse toward the center in the width direction in the extending direction. In other words, in the lying position on the back, urine discharged from the urination opening H and loose stool discharged from the anus K flow along the skin toward the rear diagonal side, especially from around the legs near the buttocks. Although the problem of leakage often occurred, in this disposable pad 1, the urine and loose stool flowing along the skin toward the rear diagonal side are blocked by the bilateral ridges 12 extending in a direction substantially orthogonal to the flow direction. It is possible to stop the urine and loose stool that have been stopped, and to diffuse the blocked urine and loose stool toward the central region 20 in the width direction along the groove 13 on both sides. Therefore, the body fluid flowing along the skin is less likely to diffuse around the legs, and leakage from around the legs can be prevented.

In the ridge groove structure formed by the central ridge portion 10 and the central groove portion 11, the distance (pitch P1) between the tops of the adjacent central ridge portions 10 and 10 is preferably 2 to 30 mm, preferably 3 to 15 mm.

It is preferable to form 3 to 10 central ridges 10 in the central region 20 in the width direction. 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 groove 11 is arranged on both sides of the width direction to which the ridges 12 on both sides and the groove 13 on both sides are connected so that the body fluid that has flowed inward in the width direction through the groove 13 on both sides easily flows into the central region 20 in the width direction. It is preferable to do so.

The protruding heights of the central ridge portion 10 and the side ridge portions 12 are preferably 1 to 5 mm, preferably 2 to 3 mm. The protruding height is the height from the bottom of the grooves 11 and 13 to the top of the ridges 10 and 12. The protruding height of the central ridge portion 10 and the protruding height of the both side ridges 12 may be formed to be substantially the same or may be formed at different heights. Preferably, the protruding height of the side ridges 12 is higher than the protruding height of the central ridge 10. As a result, the tips of the ridges 12 on both sides are in close contact with the skin surface to facilitate the capture of the body fluid flowing along the skin, and in the central region 20 in the width direction, the body fluid extends beyond the central ridge 10 and is adjacent to the central groove. It becomes easy to diffuse to 11, and the diffusion of body fluid along a specific central groove 11 in the longitudinal direction is suppressed.

In the ridge groove structure formed by the ridges 12 on both sides and the groove 13 on both sides, the distance (pitch P2) between the tops of the adjacent ridges 12 and 12 is 2 to 20 mm, preferably 3 to 10 mm. The pitch P2 may be the same as or different from the pitch P1 of the ridge structure formed in the central region 20 in the width direction. Preferably, the pitch P2 in both side regions 21 is smaller than the pitch P1 in the widthwise central region 20. As a result, in the central region 20 in the width direction, more body fluid can be diffused along the longitudinal direction, and in the bilateral region 21, the bodily fluid flowing along the skin more reliably with a fine pitch can be more reliably flowed through the skin on both side ridges 12. You will be able to capture it with. The pitch ratio at this time is preferably about 1.2 to 2 for P1 / P2.

In the direction in which the ridges 12 on both sides and the groove 13 on both sides extend, the angle α formed by the longitudinal direction line (the line parallel to the longitudinal center line CL) of the disposable pad 1 is 25 to 80 °, preferably 40 to 75 °. It is better to do it. By forming in this angle range, the wearer can more reliably capture the body fluid flowing along the skin from the central portion in the width direction toward the lateral diagonal rearward in the supine lying posture.

The ridges 12 on both sides and the groove 13 on both sides are preferably formed in a straight line that is inclined as shown in the illustrated example, but may be formed in a curved shape that bulges forward or rearward in the longitudinal direction.

As shown in FIG. 6, the bilateral ridges 12 are preferably formed so that the protruding height toward the skin gradually increases toward the outside in the width direction. That is, it is preferable to form the surface sheet 3 so that the height gradually increases toward the skin side toward the outside in the width direction. As a result, the part closer to the outer leg in the width direction has better adhesion to the skin surface, and the ridges 12 on both sides act as a barrier to easily block the body fluid flowing along the skin, and from around the leg. Leakage can be prevented more reliably. As the ratio of the protruding heights, if the height of the inner end in the width direction is h1 and the height of the outer end in the width direction is h2, h1 / h2 is 0.2 to 0.8, preferably 0.5 to 0. It is better to set it to 7.

In order to gradually increase the protruding height of the ridges 12 on both sides toward the outside in the width direction, the ridges 12 are provided on the peripheral surfaces of the rolls (rolls 32 and 33 shown in FIG. 10) when the ridges 12 are formed. This can be achieved by gradually increasing the heights of the formed convex portions and 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 portion of each groove portion. It is preferable that the openings 14 are provided in a row at the center of each groove in the width direction along the longitudinal direction of the groove. By providing the opening 14, the body fluid can quickly pass through the surface sheet 3 to the lower layer side through the opening 14, and the absorbability of the body fluid flowing along the grooves 11 and 13 can be improved.

The planar shape of the opening 14 is arbitrary, but as shown in FIG. 7, it is preferably formed into a vertically long elliptical shape along the longitudinal direction of the groove. As a result, the body fluid flowing along the groove longitudinal direction is likely to enter the opening 14, and the body fluid is likely to flow along the groove longitudinal direction.

The size of the opening 14 is preferably such that the solid matter contained in the loose stool can pass through, and specifically, the size is preferably 3 to 10 mm ² .

As shown in FIG. 7, the openings 14 are arranged so that the distance S2 between the openings adjacent to each other is larger than the distance S1 between the holes adjacent to each other along the direction in which each groove extends. It is preferable to form. That is, it is preferable that the distance S1 between adjacent openings along each groove is smaller than the pitch P1 or P2 in each region. As a result, the body fluid is likely to diffuse along the longitudinal direction of the groove where the distance between the openings is small, and it is difficult for the body fluid to flow along the adjacent grooves where the distance is large.

It is preferable that the opening 14 is formed in a larger area in the central groove 11 than in the opening 14 formed in the groove 13 on both sides. As a result, the body fluid that has diffused the groove portions 13 on both sides and is concentrated in the central region 20 in the width direction does not accumulate on the surface, but passes through the relatively large-area opening 14 formed in the central groove portion 11 on the lower layer side. It will be 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 groove 13 on both sides is 1.2 to 3.0, preferably 1.5 to. It should be 2.0.

In the disposable pad 1, a second sheet 7 can be provided between the surface sheet 3 and the absorber 4 adjacent to the non-skin side of the surface sheet 3. The planar shape of the second sheet 7 is substantially the same as that of the surface sheet 3. As the second sheet 7, for example, a perforated or non-perforated non-woven fabric, a perforated plastic sheet, or the like can be used. As the fiber material constituting the non-woven fabric, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and amide-based fibers, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. The second sheet 7 may be composed of one non-woven fabric, or may be formed by laminating a plurality of non-woven fabrics. Further, as the second sheet 7, it is preferable to use a stretchable non-woven fabric in order to facilitate the formation of the above-mentioned ridged groove structure as in the case of the surface sheet 3.

As shown in FIG. 8, the second sheet 7 is preferably formed in a ridge shape together with the surface sheet 3. That is, in a state where the surface sheet 3 and the second sheet 7 are laminated, the surface sheet 3 and the second sheet 7 are integrally subjected to uneven processing, so that a space portion is formed between the surface sheet 3 and the second sheet 7. It is preferable that the second sheet 7 is formed in a ridge-like shape along the ridge-groove shape of the surface sheet 3. By arranging the second sheet 7 on the non-skin side of the surface sheet 3 and forming the second sheet 7 together with the surface sheet 3 in a ridge shape, the uneven shape of the surface sheet 3 can be firmly maintained. , The body fluid that has passed through the surface sheet 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 so 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 to the non-skin side, loose stools or the like in which solid substances are mixed in the liquid move the second sheet 7 from the skin side to the non-skin side. In the process of passing, the solid matter and the water can be separated when passing between the fibers whose fiber density gradually increases, the solid matter can be captured by the second sheet 7, and the water can be absorbed by the absorber 4. become. In order to change the fiber density of the second sheet 7, one non-woven fabric may be configured so that the fiber density gradually increases from the skin side to the non-skin side, or the non-woven fabric having a low fiber density and the fiber density may be configured. It may be constructed by laminating a non-woven fabric having a high density.

When the second sheet 7 has the function of separating solid matter such as loose stool and water as described above, the second sheet 7 is not provided with the holes 14 as provided in the surface sheet 3. Is preferable. 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 deteriorated.

On the other hand, the second sheet 7 may be formed of a flat non-woven fabric sheet as shown in FIG. 9 without being formed in a ridge shape together with the surface sheet 3. As a result, in the portion where the surface sheet 3 is formed in the shape of a ridge, the bottom portion of the groove portion of the surface sheet 3 is joined to the second sheet 7, and in the ridge portion of the surface sheet 3, the surface sheet 3 and the second sheet are formed. A space portion is formed between the vehicle and the vehicle 7.

Next, among the methods for manufacturing the disposable pad 1, a method for forming the surface sheet 3 in a ridge shape will be described. Other manufacturing methods are the same as those for ordinary disposable pads. As shown in FIG. 10, the surface sheet 3 has a pin roll 30 provided with a large number of pins corresponding to the holes 14 on the peripheral surface and a concave roll having recesses corresponding to the pins provided on the peripheral surface. After making the holes 14 by passing through the space between the 31 and 31, the recesses corresponding to the central ridges 10 and the side ridges 12 and the recesses corresponding to the ridges 12 on both sides in a state where the second sheet 7 is laminated on the non-skin side as needed. The first roll 32 in which the convex portions corresponding to the central groove portion 11 and the groove portions 13 on both sides are formed on the peripheral surface, and the convex portions and the concave portions corresponding to the concave portions and the convex portions of the first roll 32 are formed on the peripheral surface. It is formed in a ridge shape by passing it between the second roll 33 and the second roll 33.

When the surface sheet 3 and the second sheet 7 are integrally provided with holes 14, the second sheet 7 is bonded to the non-skin side of the surface sheet 3 in advance, and the surface sheet 3 and the second sheet 7 are joined to each other. May pass between the pin roll 30 and the concave roll 31. Further, when the second sheet 7 made of a flat non-woven fabric is laminated on the non-skin side of the surface sheet 3, the second sheet 7 is not laminated before passing between the first roll 32 and the second roll 33. The surface sheet 3 may be passed between the first roll 32 and the second roll 33 as a single unit, and then the second sheet 7 may be laminated.

1 ... Disposable pad, 2 ... Leakage-proof sheet, 3 ... Surface sheet, 4 ... Absorber, 5 ... Exterior sheet, 6 ... Gather sheet, 7 ... Second sheet, 8 ... Encapsulation sheet, 9 ... Filamentous elastic elastic member, 10 ... Central ridge, 11 ... Central groove, 12 ... Both sides ridge, 13 ... Both sides groove, 14 ... Opening, 20 ... Width central area, 21 ... Both sides area

Claims (7)

In an absorbent article in which an absorber is interposed between the surface sheet and the leak-proof sheet,
In the surface sheet, a plurality of central ridges and central grooves extending in the longitudinal direction are alternately formed in the central region in the width direction in the width direction, and the rear side of the surface sheet is formed in both side regions on both sides thereof inward toward the inside in the width direction. An absorbent article characterized in that a plurality of ridges on both sides and grooves on both sides extending in a direction inclined toward the surface are alternately formed in a direction orthogonal to the ridges on both sides. The absorbent article according to claim 1, wherein the ridges on both sides are formed so that the protruding height toward the skin gradually increases toward the outside in the width direction. The absorbent article according to any one of claims 1 and 2, wherein a large number of openings are provided in the central groove portion and the groove portions on both sides at intervals along the bottom portion of the groove portions, respectively. The absorbent article according to claim 3, wherein the openings are formed so that the distance between the openings adjacent to each other is larger than the distance between the openings adjacent to each other along the direction in which the groove extends. The absorbent article according to any one of claims 3 and 4, wherein the opening formed in the central groove has a larger area than the opening formed in the groove on both sides. The absorbent article according to any one of claims 1 to 5, wherein a second sheet is arranged on the non-skin side of the surface sheet, and the second sheet is formed in a ridge shape together with the surface 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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