JP2019170901A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of excellently preventing lateral leakage even when a wearer is lying on his/her side.SOLUTION: A roughly planar absorbent article comprises a liquid-permeable upper side sheet, a liquid-impermeable lower side sheet, and an absorber layer arranged between the upper side sheet and the lower side sheet, and has a prescribed length in a back and forth direction, and a prescribed width in a width direction orthogonal to the back and forth direction. The absorber layer has thick wall parts separated on both sides of a center line extending in the back and forth direction, and extending along the back and forth direction, an outer shape of the thick wall part in plain view has unevenness in the width direction inside, and a through hole or a dent is formed in the width direction in a recessed position of the unevenness.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  As an absorbent article having an absorbent body, a sanitary napkin is known in addition to disposable diapers in the form of pad type, tape type, pants type and the like. Such an absorbent article generally has a configuration including a liquid-permeable upper sheet, a liquid-impervious lower sheet, and an absorbent layer interposed between the two sheets.

  As the above-mentioned absorbent article, there is an absorbent article in which an absorbent layer is configured to suppress side leakage of body fluid. For example, Patent Document 1 includes an absorber (absorber layer) in which a first liquid absorption part is disposed on both ends in the width direction and a second liquid absorption part is disposed adjacent to the center in the width direction. An absorbent article is disclosed in which the degree of swelling in the thickness direction of the first liquid absorbing part during liquid absorption is greater than that of the second liquid absorbing part. According to the configuration disclosed in Patent Document 1, when both liquid absorbing parts swell, the thickness of the first liquid absorbing part can be made larger than that of the second liquid absorbing part. The thickness of the absorber can be increased. Therefore, the absorbent body can be projected to the top sheet side at both ends of the absorbent body, and the liquid can be prevented from flowing outward in the width direction of the absorbent body by the projecting portions.

JP 2017-189243 A

  However, since the configuration disclosed in Patent Document 1 does not function unless it absorbs liquid and swells, when a large amount of body fluid is discharged first after wearing, the flow of body fluid to the outside in the width direction cannot be suppressed. There is a case. In addition, since the absorption / diffusion function on both sides of the absorbent body is not sufficient, if a large amount of body fluid is discharged while the wearer of the absorbent article lies down sideways, the body fluid will exceed both sides. Side leakage may occur.

  In view of the above points, an object of the present invention is to provide an absorbent article that can prevent side leakage even when body fluid is discharged while the wearer is lying sideways.

A first aspect of the present invention includes a liquid-permeable upper sheet, a liquid-impervious lower sheet, and an absorber layer disposed between the upper sheet and the lower sheet. A substantially planar absorbent article having a predetermined length in a direction and a predetermined width in a width direction orthogonal to the front-rear direction,
The absorber layer has thick portions extending along the front-rear direction and spaced apart on both sides of a center line extending in the front-rear direction, and the outer shape of each thick portion in plan view is There are irregularities on the inner side in the width direction, and through holes or depressions are formed in the thickness direction at the positions of the concave portions of the irregularities.

  According to the first aspect, the absorber layer has the thick portion that extends in the front-rear direction and is separated from both sides of the front-rear direction center line. As a result, even if the discharged body fluid moves to the outside in the width direction, it is blocked by the thick portion, so that even when a large amount of body fluid is discharged for the first time after wearing, the body fluid flows out to the outside in the width direction. Can be prevented. Moreover, since the outer shape of the thick portion in plan view has irregularities on the inner side in the width direction, the discharged body fluid is guided to the concave portion, and further absorbed and diffused around the concave portion and to the side thereof. Has an effect. And the said effect | action can be improved by the through-hole or hollow formed in the position of a recessed part, and the absorber of a side part can be utilized effectively.

  When a large amount of body fluid is discharged while the wearer is lying sideways, side leakage may not be prevented only by promoting the transfer of body fluid in the front-rear direction. However, according to the present embodiment, the absorption function and the diffusion function of the absorber on the side can be enhanced, so that side leakage can be prevented satisfactorily.

  In the second aspect of the present invention, a second absorber layer is laminated on the lower side of the absorber layer, and the second absorber layer is formed in at least one of the through hole or the depression in a plan view. A diffusion portion that extends in the front-rear direction so as to overlap and promotes the diffusion of the liquid is provided.

  According to the second aspect, the second absorber layer is laminated on the lower side of the absorber layer, and the second absorber layer is arranged in the front-rear direction so as to overlap the through hole or the depression of the absorber layer. An extending diffusion portion is formed. For this reason, the bodily fluid induced | guided | derived to the through-hole or the hollow in the upper absorber layer can be transferred to the lower 2nd absorber layer, and can be diffused in the front-back direction in the side part of an absorber. Thereby, the absorber of a side part can be utilized effectively. Moreover, in this aspect, since the bodily fluid can be promptly sent to the lower layer, the discomfort that can occur when the bodily fluid staying in the upper layer touches the skin can be reduced.

  In the third aspect, the absorber layer has a diffusion part that promotes liquid diffusion, extending in the front-rear direction, respectively, on the outer side in the width direction of the thick part, and the diffusion part is at least It is connected to one of the through holes or the recess.

  According to the 3rd aspect of this invention, it has the spreading | diffusion part which each extends in the front-back direction in the width direction outer side of a thick part, and contact | connects a penetration part or a hollow. For this reason, the bodily fluid induced | guided | derived to the through-hole or the hollow can be diffused in the front-back direction in the side part of the width direction outer side of a through-hole or a hollow. Thereby, the absorber of a side part can be utilized effectively along the front-back direction.

  In the fourth aspect of the present invention, the diffusing portion is a slit or a groove, or a portion having lower absorbency than the surroundings.

  According to the fourth aspect, since the diffusion part is a slit or groove, or a part having lower absorbency than the surroundings, the diffusion along the front-rear direction of the body fluid that has reached the diffusion part is promoted, and the side part is absorbed. The body can be used more effectively along the front-rear direction.

  In the fifth aspect of the present invention, the thick portion is provided in a crotch corresponding region corresponding to a crotch when worn.

  According to the fifth aspect, since the thick portion is provided in the crotch correspondence region, the discharged body fluid can be quickly absorbed and diffused at the side portion of the absorber layer.

  In the sixth aspect of the present invention, the thick part includes a shape in which a plurality of partial circular or partial elliptical convex parts are arranged in the longitudinal direction, and the concave part is located between the convex parts.

  According to the sixth aspect, since the thick portion includes a shape formed by combining a plurality of partial circular or partial elliptical convex portions, the area of the thick portion in plan view can be increased. The amount of the absorber in the thick part can be increased.

  According to one aspect of the present invention, it is possible to provide an absorbent article that can prevent side leakage even when body fluid is discharged while the wearer is lying sideways.

It is a top view of an absorptive article by a 1st embodiment of the present invention. It is the II sectional view taken on the line of FIG. It is a top view which shows a part of absorbent article shown in FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the figure which expanded a part of FIG. It is a figure for demonstrating the modification of a thick part and a through-hole. It is a figure for demonstrating the modification of a thick part and a through-hole. It is a figure for demonstrating the modification of a thick part. It is a top view of an absorptive article by a 2nd embodiment of the present invention. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, unless otherwise specified, the same or corresponding components may be denoted by the same reference numerals and description thereof may be omitted.

(Basic structure of absorbent article)
First, the basic structure of the absorbent article according to the embodiment of the present invention will be described. In the following description, an embodiment of the present invention will be described based on an example of a pad type disposable diaper (urine collection pad).

  In FIG. 1, the top view of the absorbent article 100 by one form of this invention is shown. FIG. 2 is a cross-sectional view taken along the line II of FIG. As shown in FIGS. 1 and 2, the absorbent article 100 includes a liquid-permeable upper sheet (also referred to as a top sheet or a top sheet) 22 and a liquid-impervious lower sheet (also referred to as a back sheet or a back sheet). ) 21 and an absorber layer 30 provided between both sheets 21 and 22. When the absorbent article 100 is mounted, the upper sheet 22 side is the skin side, and the lower sheet 21 side is the side fixed to the outer (outer diaper), underwear, or the like.

  As shown in FIG. 1, the absorbent article 100 has a predetermined length in a first direction (front-rear direction or longitudinal direction) D1 and a second direction (width direction) orthogonal to the first direction D1 in plan view. (Or lateral direction) D2 has a predetermined width. In the form of FIG. 1, the width of the absorbent article 100 is shorter than the length. That is, the absorbent article 100 has an elongated shape as a whole. In addition, the front and back of the absorbent article 100 correspond to the abdominal side and the back side, respectively, when worn (a state in which the absorbent article 100 is worn).

  Moreover, as shown in FIG. 2, the absorbent article 100 is substantially planar. The term “substantially planar” refers to a flat shape (also referred to as a sheet shape or a layer shape) that is thin and spread, and includes a surface that partially bulges.

  The length (full length) of the absorbent article 100 in the front-rear direction D1 can be about 350 to 700 mm, and the length (full width) in the width direction D2 can be about 130 to 400 mm. The shape of the absorbent article 100 can be line symmetric with the center line CL extending in the front-rear direction D1 as a symmetric line, but is not necessarily line symmetric. The configuration of the absorbent article 100 (the size, shape, arrangement, etc. of each element such as the upper sheet 22, the lower sheet 21, and the absorber layer 30) may also be axisymmetric, but the shape of the absorbent article 100 Similarly to the above, it may not be line symmetric.

  In the form of FIG. 1, the absorbent article 100 has a crotch corresponding region RC <b> 1 near the center when viewed in the front-rear direction D <b> 1. In the present specification, the “groin corresponding region” means a portion corresponding to the crotch (inseam) of the body at the time of use. The crotch-corresponding region RC1 may be, for example, a range from the center in the front-rear direction D1 of the absorbent article 100 or its vicinity to a predetermined position in front, or a predetermined range in the center in the front-rear direction D1 of the absorbent article. . In the form of FIG. 1, the absorbent article 100 is formed with a constricted portion having a narrow width, but the region where the constricted portion is formed or a part thereof is a crotch corresponding region RC1. In addition, the region where the constricted portion is formed may be a part of the crotch corresponding region RC1. Further, a region adjacent to the front of the crotch corresponding region RC1 and up to the front end of the absorbent article 100 is a front region RF1, and is adjacent to the rear of the crotch corresponding region RC1 and extends to the rear end of the absorbent article 100. Is the rear region RB1.

  As described above, the shape of the absorbent article 100 in plan view does not include a portion (constricted portion) whose width is narrower than the front and rear regions, but a rectangular shape whose width is constant in the front-rear direction D1. Other shapes can also be used.

  The length in the front-rear direction D1 of the crotch corresponding region RC1 is about 10 to 150 mm, the length of the front region RF1 in the front-rear direction D1 is about 50 to 350 mm, and the length of the rear region RB1 in the front-rear direction D1 is about 50 to 350 mm. be able to. Moreover, when the absorbent article 100 has a constricted portion, the minimum width is preferably about 50 to 90% of the entire width of the absorbent article 100 (the length in the width direction D2 before and after the constricted portion).

  The lower sheet 21 can have the same shape and size as the absorbent article 100. The size of the lower sheet 21 may be larger than the absorber layer 30. As the lower sheet 21, in addition to a polyethylene film or the like, a sheet having moisture permeability can be used without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. In addition, the outer surface of the lower sheet 21 can be covered with an exterior sheet such as a nonwoven fabric.

  As shown in FIGS. 1 and 2, the upper sheet 22 is arranged on the upper side of the absorber layer 30. In the illustrated form, the upper sheet 22 does not cover part of the end of the absorbent layer 30 in the width direction D2, but may cover the entire absorbent layer 30. As the upper sheet 22, a perforated or non-porous nonwoven fabric or a perforated plastic sheet can be used. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene and polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  As shown in FIGS. 1 and 2, an intermediate sheet 25 can be interposed between the upper sheet 22 and the absorber layer 30. By providing the intermediate sheet 25, the body fluid absorbed by the absorber layer 30 can be prevented from returning. Therefore, as the intermediate sheet 25, it is preferable to use a material having low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films.

  The lower sheet 21 and the upper sheet 22 may be bonded to both ends of the absorbent layer 30 in the front-rear direction D1. Moreover, in the both sides of the width direction D2 of the absorbent article 100, the lower sheet | seat 21 and the gather sheets 24 and 24 each provided in the both sides of the absorbent article 100 along the front-back direction D1 are bonded together. ing.

  As the gather sheet 24, a plastic sheet, a melt-blown nonwoven fabric, and the like can be used. From the viewpoint of good touch to the skin, a nonwoven fabric that has been subjected to a water repellent treatment with silicone or the like is preferably used.

  As shown in FIGS. 1 and 2, the gather sheets 24, 24 are overlaid on the upper sheet 22. And the elastic member fixed in the expansion | extension state along the front-back direction D1 may be provided in the edge part inside the width direction D2 of each casser sheet. This elastic member may be manufactured from a styrene rubber, an olefin rubber, a urethane rubber, an ester rubber or the like formed in a thread shape, a string shape, a belt shape, or the like.

  Further, the gather sheet 24 may be joined to the upper sheet 22, the packaging sheet 26, or the lower sheet 21 disposed immediately below the hatched area in FIG. 1. And, as described above, by providing an elastic member at the inner end of the gather sheet 24 in the width direction D2, the portion of the gather sheet 24 that is not joined (that is, the inner area in the width direction D2, The area excluding both end portions) can be gathers G, G standing on the front side (upper sheet side) of the absorbent article 100. The gathers G and G can prevent the body fluid from leaking to the side.

  In addition, joining of the gather sheets 24 and 24 and the lower component can be formed by, for example, a hot melt adhesive, heat sealing, or ultrasonic sealing.

  As shown in FIG. 1, the absorbent layer 30 has an elongated shape as a whole, like the absorbent article 100. In the illustrated form, the planar view shape of the absorbent layer 30 has a constricted portion, like the overall planar view shape of the absorbent article 100. However, the shape of the absorbent layer 30 in plan view may be, for example, a rectangular shape without a constricted portion whose width is constant in the front-rear direction D1, regardless of the shape of the absorbent article 100 in plan view. In addition, when the absorber layer 30 has a constricted portion as illustrated, the minimum width of the constricted portion can be about 50 to 75% of the length in the width direction D2 before and after the constricted portion.

  As shown in FIGS. 1 and 2, the absorber layer 30 may be entirely or partially wrapped with a packaging sheet 26 such as a nonwoven fabric or crepe paper. Moreover, when the absorber layer 30 consists of multiple layers as will be described later, each layer may be wrapped with a packaging sheet, or the packaging sheet may be sandwiched between layers. The packaging sheet 26 may be uncolored (that is, white) or may be colored. The color can be a color that can make the color of the discharged body fluid inconspicuous, for example, a color close to the color of the body fluid, or a color complementary to or close to the color of the body fluid.

  As shown in FIG. 1, the absorbent body layer 30 has a crotch corresponding region RC2 in the vicinity of the center when viewed in the front-rear direction D1, and the crotch corresponding region RC2 is a crotch corresponding region of the absorbent article 100 described above. Corresponds to RC1. A region adjacent to the front of the crotch corresponding region RC2 and extending to the front end of the absorber layer 30 is a front region RF2, and is adjacent to the rear of the crotch corresponding region RC2 and extending to the rear end of the absorber layer 30. Is the rear region RB2.

  In addition, as shown in the figure, the crotch corresponding region RC2 of the absorber layer 30 that can constitute a part of the constricted portion may be disposed in the front half region of the absorber layer 30 or the entire product. Depending on the configuration, the absorber layer 30 may be disposed at the center in the front-rear direction D1.

  The absorber layer 30 includes fibers or filaments. The absorber layer 30 may be, for example, a pulp fiber stack, an aggregate of filaments such as cellulose acetate, and a nonwoven fabric. Moreover, as the absorber layer 30, in addition to the above-described fibers or filaments, those obtained by mixing, adhering, or the like with a superabsorbent polymer such as particles can be used as necessary. In order to prevent particle spillage, such as when mixing superabsorbent polymer particles, the absorber layer 30 is preferably wrapped with a packaging sheet 26.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorber layer 30 (each absorber layer when there are a plurality of absorber layers as described later) can be determined as appropriate, but the fiber basis weight is 100 to 700 g / m. The weight is preferably about ^2, and when the absorbent polymer is included, the basis weight is preferably about 50 to 550 g / m ² .

(First embodiment)
1st Embodiment can be made into the absorbent article 100 shown in FIG. 1st Embodiment is described based on FIG. 3 which shows a part of the absorbent article 100 of FIG. FIG. 3 shows a state in which the upper sheet 22, the intermediate sheet 25, the gather sheet 24, and the packaging sheet 26 are omitted from the configuration shown in FIG. 4 schematically shows a cross section taken along the line II-II in FIG. 3, and FIG. 5 schematically shows a cross section taken along the line III-III in FIG.

  In the absorbent article 100 according to the first embodiment, the absorber layer 30 is formed by laminating an upper first absorber layer 31 and a lower second absorber layer 32 (FIGS. 4 and 5). In the illustrated form, the first absorber layer 31 and the second absorber layer 32 have the same shape and size in plan view, but the shape and size of both layers may be different from each other.

  As shown in FIG. 3, the upper first absorber layer 31 includes thick portions 34 and 34 that are spaced apart on both sides of the front-rear direction center line CL and extend in the front-rear direction D1. The thick part 34 is a part thicker than the surroundings (FIGS. 4 and 5). The thick portion 34 can be formed by using a mold that can be stacked so that a place where the thick portion 34 is to be formed is raised when the absorber layer is manufactured. Moreover, it can also form by preparing the absorber layer which has uniform thickness, and laminating | stacking an absorber layer piece on the part which wants to form the thick part 34 on it. The form shown in FIGS. 4 and 5 is formed by the former method.

  The maximum thickness f (FIGS. 4 and 5) of the thick portion 34 can be about 10 to 40 mm. In addition, the thickness g of the absorber layer 31 other than the thick portion 34 can be about 3 to 30 mm (FIGS. 4 and 5). Moreover, the thickness of the absorber layer 30 whole may be about 3-40 mm.

  As shown in FIG. 3, when the thick portions 34 and 34 are provided on both sides of the first absorbent layer 31, it is possible to block the body fluid that has shifted to the outside in the width direction D <b> 2. Therefore, even when a large amount of body fluid is discharged for the first time after the absorbent article 100 is attached, it is possible to prevent body fluid from flowing out to the outside in the width direction D2, and to prevent leakage of body fluid to the outside in the width direction D2. Can do.

  As shown in FIG. 3, the thick portion 34 is formed in the crotch corresponding region RC <b> 2 of the first absorbent layer 31 (absorber layer 30) or the crotch corresponding region RC <b> 1 of the absorbent article 100. Thereby, the discharged body fluid can be immediately absorbed and diffused at the side of the absorber including the thick portion 34.

  The formation in the crotch corresponding region RC2 (or crotch corresponding region RC1) means that at least a part of the thick portion 34 extends in the crotch corresponding region RC2 (or crotch corresponding region RC1). To do. The thick portion 34 may extend beyond both the front end and the rear end of the crotch corresponding region RC2 (or the crotch corresponding region RC1) as shown in the figure, Either one of the rear ends may extend beyond the crotch corresponding region RC2 (or the crotch corresponding region RC1). Moreover, the whole thick part 34 may be arrange | positioned in the crotch corresponding area | region RC2 (or crotch corresponding area | region RC1).

  The thick portion 34 has a contoured shape with projections and depressions in plan view, and the projections and recesses of the contoured shape of the thick thickness portion 34 are formed at least inside the width direction D2. For this reason, body fluid can be favorably guided to the recess 35.

  In the configuration where there is a thick portion but no recess and no through-hole, it is considered that the body fluid can be promoted to move in the front-rear direction D1, but the body fluid is absorbed and diffused at the thick portion itself and its side or periphery. The function to make it is not enough. Therefore, in the case of sudden discharge, it is not sufficient to encourage the body fluid to move in the front-rear direction D1, and the body fluid may get over the thick part and flow out to the outside in the width direction D2.

  On the other hand, in this embodiment, since the outer shape inside the width direction D2 of the thick portion has irregularities, the body fluid that moves in the front-rear direction D1 can also be drawn into the recess 35. Therefore, more body fluid can be captured by the thick portion 34. Therefore, the absorption and diffusion of the body fluid in the thick part 34 and the periphery thereof, that is, the side part of the first absorber layer 31 can be promoted, and the side part of the first absorber layer 31 can be used more effectively. Can do. Thereby, even when a large amount of bodily fluid is discharged while the wearer is lying sideways, leakage of bodily fluid to the outside in the width direction D2 can be satisfactorily prevented.

  Further, as shown in FIG. 3, a through hole 37 is formed at the position of the recess 35. In the present specification, the through-hole (or through-portion) means a hole that penetrates the absorber layer in a substantially thickness direction. That is, it is a hole formed along a direction substantially perpendicular to the surface direction of the absorber layer 30 (including the first absorber layer 31 and the second absorber layer 32 in the first embodiment). The substantially thickness direction may be a direction inclined by ± 15 °, preferably about ± 5 ° with respect to the thickness direction. The through-hole 37 can be formed by stacking the absorber layer so that the absorber is not disposed in the portion, and after forming the absorber layer without the hole, it is punched by a punch or the like. Can also be formed.

  Since the through hole 37 is formed at the position of the recess 35, the above-described effect of guiding the body fluid to the recess 35 can be further enhanced. Moreover, since the induced body fluid can be absorbed and diffused from the edge of the through hole 37 to the surroundings, the action of absorbing and diffusing the body fluid at the side of the absorber can also be improved.

  Next, the structure of the thick part 34 and the through-hole 37 is demonstrated in detail. FIG. 6 shows an enlarged view of the vicinity of the thick portion 34 (partially enlarged view of FIG. 3). As shown in FIG. 6, the thick portion 34 can have a shape in which a plurality of partial circular convex portions 36 are arranged in the same direction in a plan view. The illustrated shape can be a shape in which a plurality of partial circles are connected at the connection position 35 </ b> A when it is assumed that there is no through hole 37. A portion including the connection position 35 </ b> A is a recess 35. The connection position 35 </ b> A corresponds to the bottom point of the recess 35 (the point located on the outermost side in the width direction D <b> 2 of the recess 35). In other words, the thick portion 34 can be said to have a shape in which the convex portions 36, 36,... And the concave portions 35, 35,.

  In the thick portion 34, the number of the convex portions 36 may be two or more, and can be appropriately changed according to the size and use of the absorbent article 100, but is preferably about 3 to 6. . Therefore, the number of the recesses 35 is preferably about 2 to 5.

  The length b of the protruding portion 36 of the thick portion 34 to the inner side in the width direction D2 is preferably 5 to 30 mm, and more preferably 10 to 25 mm. By setting b to 15 mm or more, the action of drawing body fluid into the recess 35 can be improved. Further, by setting b to 15 mm or less, it is possible to reduce a sense of discomfort that may occur when the thick portion 34 hits the body in the mounted state. The length b of the overhanging portion is a distance in the width direction D2 from the position where the outline of the thick portion 34 reaches the edge of the through hole 37 to the apex 36A of the convex portion 36 in plan view. Therefore, it varies depending on the size and shape of the through hole 37.

  The distance c between the convex portions 36 of the thick portion 34 (the distance between the apexes 36A of the convex portions 36) is preferably 20 to 50 mm, and more preferably 25 to 45 mm. By setting c in the above range, body fluid can be easily drawn into the recess 35.

  Each of the above dimensions b and c may be the same throughout the thick portion 34 or may be different. If they are different, the value may gradually increase toward the front or rear, or may decrease. Further, the value may gradually increase or decrease toward the center of the thick portion 34 or the crotch corresponding region RC2 in the front-rear direction D1. The said dimension can be suitably set according to the size of the absorbent article 100, the whole structure, a use, etc.

  In the illustrated form, the shape of the convex portion 36 includes a partial circle, but the shape of the convex portion 36 is not particularly limited. The convex portion 36 may be a partial ellipse or a polygon such as a triangle or a quadrangle. For example, a trapezoid in which a short side is arranged inside the width direction D2 may be used. 7A and 7B show a modification of the shape of the thick portion 34 in plan view.

  In the example of FIG. 7A, the uneven shape on the inner side in the width direction D <b> 2 of the thick portion 34 can be a continuous wavy curve when it is assumed that there is no through hole 37. Such a wavy curve may have a shape in which the tangential direction changes continuously as shown in the figure, or the change in the tangential direction may be discontinuous. Moreover, in the example of FIG. 7B, the shape of the unevenness | corrugation inside the width direction D2 of the thick part 34 contains a triangle.

  As shown in FIGS. 3 and 6, the thick portion 34 in the present embodiment extends to the end of the absorber layer 31 in the width direction D <b> 2, but the thick portion 34 is not the absorber layer 31. It can also be set as the structure extended even before the edge part of the width direction D2. However, if the thick portion 34 extends to the end of the absorber layer 31 in the width direction D2, the absorption capacity at the side of the absorber layer 31 (and thus the absorber layer 30 as a whole) is increased. This is preferable.

  FIG. 8 shows another modification of the thick portion 34. 8 is a cross-sectional view corresponding to the cross-sectional view of FIG. 4 (a cross-sectional view taken along the line II-II of FIG. 3). In the example of FIG. 8, the thickness of the thick portion 34 is not uniform, and the thickness in the center in the width direction D2 is thick. More specifically, the cross-sectional view shape of the upper part of the thick part 34 has a curved outline. Further, when the thick portion 34 is cut by a line extending in the front-rear direction D1, the contour of the upper cross-sectional view shape may include a curve. For example, the cross-sectional view shape along the front-back direction D1 of each convex part 36 may be dome shape.

  In the form of FIG. 3, the through hole 37 is circular in plan view, but the shape of the through hole 37 in plan view is not limited to that illustrated. For example, the shape may be a polygon such as an ellipse, a triangle, or a rectangle, or a star shape. When the shape of the through hole 37 in plan view is a shape in which the distance from the center to the outline of the through hole 37 varies depending on the location, particularly a star shape, the through hole 37 is not easily crushed even if the absorber swells. Therefore, it is preferable.

  When the plan view shape is circular, the size of the through hole 37 is preferably 5 to 20 mm, and more preferably 7 to 15 mm. When the diameter of the through hole 37 is 5 mm or more, the through hole 37 is not easily crushed even if the absorber absorbs the body fluid and swells. Moreover, since the diameter of the through-hole 37 is 20 mm or less, it can prevent that the quantity of an absorber reduces excessively and can ensure sufficient absorption capacity. In addition, when the planar view shape of the through-hole 37 is not circular, it is preferable that the circular diameter which has an equivalent area exists in the same range as the above.

  Further, the through hole 37 may be a depression instead. Here, the depression means a portion that is depressed in the substantially thickness direction, and unlike the through hole, an absorber is present at a place where the depression is formed. The depression may be depressed from the upper side to the lower side, or may be depressed from the lower side to the upper side. The depression can be formed by stacking so that the basis weight is reduced only by that portion, or can be formed by squeezing the absorber layer formed flat from the upper side or the lower side. .

  As shown in FIGS. 3 and 6, the through hole 37 is provided at the position of the recess 35. In the illustrated form, the center of the through hole 37 is provided at a virtual connection position 35 </ b> A of the partial circular projection 36 of the thick portion 34. However, this arrangement may be shifted in the front-rear direction D1 and / or the width direction D2. For example, the edge of the through hole 37 may be provided so as to be in contact with the connection position 35 </ b> A of the partial circular protrusion 36 of the thick portion 34. In the form shown in FIG. 7B, the edge of the through hole 37 is in contact with the connection position 35 </ b> A of the convex portion 36.

  In the first embodiment, as shown in FIGS. 3 to 5, a diffusion portion 38 is provided in the second absorber layer 32 stacked below the absorber layer 31. The configuration of the diffusion unit 38 is not particularly limited as long as it has a function capable of promoting the diffusion of the absorbed liquid (body fluid).

  As shown in FIG. 3, the diffusing portion 38 extends in the front-rear direction D <b> 1 so as to overlap with the through hole 37 formed in the upper absorber layer 31 in a plan view. Thereby, the bodily fluid collected (induced) in the through-hole 37 can be quickly transferred to the lower second absorber layer 32. Then, the body fluid is guided in the front-rear direction D1 along the diffusion portion 38 in the lower second absorber layer 32. At this time, the absorber on the side of the diffusion portion 38 and the diffusion portion depending on the configuration. 38 itself can also absorb and diffuse body fluids.

  The diffusing portion 38 only has to overlap with at least one through hole 37 in plan view. However, when the diffusion portion 38 extends so as to overlap all the through holes 37, the diffusion portion 38 can directly receive a large amount of body fluid from the through holes 37 and diffuse it in the front-rear direction D1. preferable.

  With the configuration of the first embodiment as described above, the side portion of the absorber can be effectively used in the thickness direction of the absorber layer 30. In this embodiment, since the bodily fluid can be quickly transferred to the lower layer, the bodily fluid can be prevented from staying in the upper layer, the bodily fluid that touches the skin can be reduced, and the wearing feeling can be improved. .

  In the illustrated form, the width of the diffusing portion 38 has the same width as the diameter of the through hole 37, and the diffusing portion 38 is centered on the diffusing portion 38 (the center passing through the center of the diffusing portion 38 in the width direction D2). ) Is arranged so as to pass through the center of the through hole 37 (FIGS. 3 to 5). However, the diffusing portion 38 may be arranged so that a part thereof overlaps the through hole 37 in plan view. Alternatively, the center of the through hole 37 may be arranged so as not to pass through the center line of the diffusion portion 38.

  As described above, the configuration of the diffusing unit 38 is not limited, but the diffusing unit 38 is preferably a slit or a groove. In this embodiment, the slit is a portion that is narrowly formed along the front-rear direction D1 and penetrates the absorber layer 32 in the thickness direction, and no absorber is left in that portion. Moreover, a groove | channel is the part which depressed the absorber layer 32 formed narrowly along the front-back direction D1, from the upper side or the lower side. In the illustrated form, the diffusion portion 38 is formed as a slit (FIGS. 4 and 5).

  Further, the diffusion portion 38 can be a portion having a lower absorbability than the surroundings. Specifically, the diffusing portion 38 can be a portion containing a small amount of superabsorbent polymer. For example, the amount of the superabsorbent polymer is 50% or less, preferably 30% or less, more preferably 10% or less, compared with the amount of the superabsorbent polymer contained in the portion around the diffusion portion 38 is 100%. Can be part. Moreover, it is preferable that the diffusion part 38 does not contain a superabsorbent polymer substantially and consists of the above-mentioned fibrous material.

  The width | variety (length of the width direction D2) of the spreading | diffusion part 38 can be about 5-30 mm. Further, the length of the diffusion portion 38 is not particularly limited, and can be about 200 to 350 mm.

  A plurality of diffusion portions 38 may be formed on one side of the front-rear direction center line CL, and the arrangement in that case overlaps with the through-hole 37 formed in the first absorber layer 37 in plan view. If it is, it will not specifically limit.

  As described above, in the present embodiment, the side portion of the absorber layer can be effectively utilized by including the thick portion 34, the through hole 37, and the diffusion portion 38, whereby the body fluid is absorbed by the absorber. It can be absorbed throughout the layer. In other words, the absorption capacity of the entire absorber layer can be exhibited.

(Second Embodiment)
FIG. 9 shows a part of the absorbent article 200 according to the second embodiment. FIG. 9 shows a state where the upper sheet, the intermediate sheet, and the packaging sheet are omitted from the absorbent article 200. 10 schematically shows a cross section taken along line IV-IV in FIG. 9, and FIG. 11 schematically shows a cross section taken along line VV in FIG.

  The basic configuration of the absorbent article 200 according to the second embodiment is the same as that of the absorbent article 100 according to the first embodiment, but a single absorber layer 230 is disposed as the absorber layer, and the thickness is thick. The difference is that the portion 234 and the diffusion portion 238 are formed in the same layer.

  Also in the second embodiment, as shown in FIG. 9, the thick portions 234 and 234 extend along the front-rear direction D1 while being separated from both sides of the front-rear direction center line CL. The outer shape in plan view of the thick portion 234 is a shape having irregularities on the inner side in the width direction D2, and a through hole 237 is formed in the concave portion 235 of the irregularities. Therefore, as in the first embodiment, the body fluid can be guided to the recess 235, and the body fluid can be absorbed and diffused in the recess 235 and its periphery, so that the side absorber can be effectively used. . Therefore, even if a large amount of body fluid is discharged while the wearer is lying sideways, side leakage can be prevented. In addition, about the structure (size, shape, arrangement | positioning) of the thick part 234 and the through-hole 237 in 2nd Embodiment, it is the same as that of what was demonstrated in 1st Embodiment (absorbent article 100).

  As shown in FIG. 9, the diffusion portions 238 are arranged on the outer side in the width direction D2 of the thick portion 234 so as to extend in the front-rear direction D1. Each diffusion portion 238 is connected to at least one through hole 237. Therefore, the body fluid guided to the recess 235 and drawn into the through hole 237 can be further guided to the diffusion unit 238. And in the spreading | diffusion part 238, a bodily fluid can be induced | guided | derived along the front-back direction D1 which is the extension direction. At that time, the body fluid can be absorbed and diffused in the absorbent body on the side of the diffusion portion 238. In this way, the diffusion part 238 can make more effective use of the side absorbent body, so that the body fluid flowing outward in the width direction D2 can be absorbed and diffused on the side part to prevent side leakage. be able to.

  The diffusion part 238 may not be connected to all the through holes 237. However, since the diffusion part 238 can quickly transfer the body fluid drawn into the through hole 237 to the diffusion part 238 and diffuse it in the front-rear direction D1, it is preferable that the diffusion part 238 is connected to all the through holes 237.

  In FIG. 9, the diffusing portion 238 is arranged so that the center line of the diffusing portion 238 (center passing through the center of the diffusing portion 38 in the width direction D2) passes through the center of the through hole 37. The positional relationship of the through holes 237 is not limited to the illustrated one. The diffusion part 238 may be shifted to the outside in the width direction D2 from the illustrated position, for example, may be adjacent to the outside in the width direction D2 of the through hole 237.

  The configuration of the diffusion unit 238 can also be the same as that described in the first embodiment. That is, the diffusion part 238 can be a slit or a groove. When the diffusion part 238 is a slit, the diffusion part 238 and the through hole 237 are integrated to form a through part. Further, in the case where the diffusion portion 238 is a groove and a depression is formed instead of the through hole 237, the diffusion portion 238 and the depression are connected to form a thin portion in the absorber layer 230. Will be. At this time, the thickness of the portion of the absorber layer 230 in which the diffusing portion 238 is provided may be the same as or different from the thickness of the portion of the absorber layer in which the depression is provided.

  In the second embodiment, it is preferable that the absorber layer exists outside the diffusion portion 238 in the width direction D2. The width of the absorber layer existing outside the diffusion portion 238 in the width direction D2 (that is, the distance from the side edge of the absorber layer 230 to the diffusion portion 238) is determined from the viewpoint of increasing the absorption capacity. It is preferable to be larger than the width of.

  The thickness of the absorber layer 230 in the second embodiment can be about 3 to 40 mm.

  As described above, the pad type disposable diaper has been described as an example of a specific form. However, this form can be applied to sanitary napkins in addition to disposable diapers of other forms such as a tape type and a pants type. it can.

21 Lower sheet 22 Upper sheet 24 Gather sheet 25 Intermediate sheet 26 Packaging sheets 30, 230 Absorber layer 31 First absorber layer 32 Second absorber layer 34, 234 Thick part 35, 235 Recess 35A, 235A Adjacent protrusion Part connection position (bottom point of recess)
36, 236 Convex part 36A, 236A Convex part apex 37, 237 Through hole or depression 38, 382 Diffusion part 100, 200 Absorbent article CL Front-rear direction center line (center line along first direction D1)
D1 Longitudinal direction (first direction)
D2 width direction (second direction)
G Gather RC1 Crotch corresponding region RF1 (absorbent article) Front region RB1 (Absorbent article) rear region RC2 (Absorber) crotch corresponding region RF2 (Absorber) front region RB2 (Absorption) Posterior area of the body

Claims (6)

A liquid-permeable upper sheet, a liquid-impervious lower sheet, and an absorber layer disposed between the upper sheet and the lower sheet, and having a predetermined length in the front-rear direction, and the front-rear A substantially planar absorbent article having a predetermined width in the width direction orthogonal to the direction,
The absorber layer has a thick portion extending along the front-rear direction and spaced apart on both sides of a center line extending in the front-rear direction;
The outer shape of each thick portion in plan view has irregularities on the inner side in the width direction, and a through hole or a depression is formed in the thickness direction at the position of the concave portion of the irregularities. A second absorber layer is laminated below the absorber layer,
2. The absorption according to claim 1, wherein the second absorber layer has a diffusion portion that extends in the front-rear direction so as to overlap at least one of the through hole or the depression in a plan view, and promotes liquid diffusion. Sex goods. The absorber layer has a diffusion part that promotes liquid diffusion, extending in the front-rear direction, respectively, on the outer side in the width direction of the thick part,
The absorbent article according to claim 1, wherein the diffusion portion is connected to at least one of the through hole or the recess.   The said diffusion part is an absorbent article of Claim 2 or 3 which is a slit or a groove | channel, or is a part whose absorbency is lower than the circumference | surroundings.   The absorbent article according to any one of claims 1 to 4, wherein the thick portion is provided in a crotch corresponding region corresponding to a crotch when being mounted.   The outer shape of the thick portion includes a shape in which a plurality of partial circular or partial elliptical convex portions are arranged in the front-rear direction, and the concave portion is located between the convex portions. The absorbent article as described in any one of these.

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