JP7289242B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles containing antimicrobial agents.

Absorbent articles such as disposable diapers typically include an absorbent body that absorbs and retains excrement such as urine, a surface sheet arranged closer to the wearer's skin than the absorbent body, and the absorbent body. and a backsheet disposed farther from the wearer's skin than the absorbent core, the absorbent body comprising an absorbent core mainly composed of an absorbent material such as a fiber material or a water-absorbent polymer, and an outer surface of the absorbent core. It comprises a core wrap sheet that covers the

BACKGROUND ART Conventionally, an antibacterial agent is blended into an absorbent article for the purpose of suppressing the growth of fungi derived from excrement while the absorbent article is being worn. For example, in Patent Document 1, a functional material region in which a functional material containing an antibacterial agent is disposed between an absorbent body and a surface sheet, and a layer adjacent to the functional material region and this in the thickness direction is described as an absorbent article having a pressed portion that is compressed in the thickness direction. In the pressing portion, the top sheet, the core wrap sheet and the absorbent core that constitute the absorbent body are integrally recessed toward the back sheet side, and the members positioned in the pressing portion are in close contact with each other without gaps. are doing.

JP 2016-67749 A

When an antibacterial agent is added to an absorbent article, the antibacterial agent is usually added to a member (for example, a topsheet) that is positioned closer to the wearer's skin than the absorbent body. By doing so, when excreta such as urine passes through the member containing the antibacterial agent in the thickness direction, the antibacterial agent is eluted together with the excrement, and the eluted matter is absorbed and held in the absorbent body. , a predetermined antibacterial effect is exhibited. However, even if the antibacterial agent is simply blended into a member such as a top sheet, the time for the eluted matter containing the antibacterial agent to pass through the member in the thickness direction is usually extremely short. There is a problem that the amount of elution is small and antibacterial effect as expected cannot be obtained.

Accordingly, an object of the present invention is to provide an absorbent article having excellent antibacterial properties.

The present invention is an absorbent article having a laminated structure for absorbing and retaining bodily fluids excreted by a wearer, wherein the laminated structure comprises a first layer disposed relatively close to the wearer's skin, It has a third layer arranged at a position relatively far from the wearer's skin, and a second layer arranged between the first layer and the third layer, wherein the first layer and the third layer Each of the three layers has a recessed portion on the skin-facing surface, a space corresponding to the recessed portion of the third layer exists between the second layer and the third layer, and the second layer or The third layer contains an antibacterial agent, and the recessed portion of the first layer and the recessed portion of the third layer overlap the antibacterial agent arrangement area in which the antibacterial agent is arranged in plan view. It is an article.

Since the absorbent article of the present invention has excellent antibacterial properties, it can effectively suppress inconveniences caused by the growth of bacteria, such as skin troubles on the wearer and generation of unpleasant odors when worn.

FIG. 1 is a developed plan view schematically showing the skin-facing surface side (inner surface side) in an unfolded and stretched state of an unfoldable disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a section taken along line II of FIG. FIG. 3 is a cross-sectional view schematically showing an enlarged part of the laminated structure shown in FIG. FIG. 4 is a view equivalent to FIG. 3 of another embodiment of the laminated structure according to the present invention. FIG. 5 is a view equivalent to FIG. 3 of still another embodiment of the laminated structure according to the present invention. FIG. 6 is a view equivalent to FIG. 3 of still another embodiment of the laminated structure according to the present invention. FIG. 7 is a view equivalent to FIG. 3 of still another embodiment of the laminated structure according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on its preferred embodiments with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

1 and 2 show a disposable diaper 1 which is one embodiment of the absorbent article of the present invention. The diaper 1 has a longitudinal direction X corresponding to the front-rear direction of the wearer, that is, a direction extending from the abdominal side to the back side through the crotch, and a lateral direction Y perpendicular to the longitudinal direction. Line CLx) is a boundary to divide into a front side portion F that is arranged on the wearer's ventral side and a rear side portion R that is arranged on the wearer's back side when worn.

As shown in FIG. 1, the diaper 1 has a front body F arranged on the wearer's front side (abdominal side) and the wearer's dorsal side (rear side) when worn with the vertical center (longitudinal center line CLx) as a boundary. It is divided into the rear viewing period R and the rear viewing period R. The vertical center line CLx is an imaginary straight line extending in the horizontal direction Y by halving the diaper 1 in the unfolded and stretched state as shown in FIG . The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is put into the unfolded state as shown in FIG . It is the same as the dimension when it is spread flat in the state).

The diaper 1 has an abdominal portion A arranged on the abdomen side of the wearer, a crotch portion B arranged on the crotch side, and a back portion C arranged on the back side. The ventral part A is part of the front body F, the back part C is part of the back body R, and the crotch part B straddles the longitudinal center line CLx in the longitudinal direction X and extends over the front body F and the back body R To position. The crotch part B includes an excretory part facing part (not shown) arranged to face the excretory part such as the wearer's penis when worn. Moreover, the diaper 1 is a so-called unfolded disposable diaper, and as shown in FIG. In addition, a fastening area 15 to which the fastening part 13 can be fastened is provided on the non-skin facing surface of the ventral part A. As shown in FIG.

The diaper 1 comprises an absorbent main body 2 having an absorbent body 5 for absorbing and retaining bodily fluids such as urine excreted by the wearer of the diaper 1, and a flap portion 6 extending outward from the peripheral edge of the absorbent main body 2. Equipped with

The absorbent body 2 of this embodiment includes a liquid-permeable topsheet 3 forming the skin-facing surface, a liquid-impermeable or liquid-sparingly permeable or water-repellent backsheet 4 forming the non-skin-facing surface, and both A liquid-retaining absorbent body 5 is interposed between the sheets 3 and 4, and these are integrated by a known bonding means such as an adhesive. The absorbent main body 2 has a rectangular shape in plan view as shown in FIG . The absorber 5 has an hourglass shape in which the central portion in the vertical direction X located in the crotch portion B is constricted inward in a plan view, and has an elongated shape elongated in the vertical direction X. As shown in FIG.

As used herein, the term “skin-facing surface” refers to the surface of an absorbent article or its component (for example, an absorbent body) that faces the wearer's skin when the absorbent article is worn, that is, the surface that faces the wearer's skin. The "non-skin facing surface" is the side of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively far from the wearer's skin. on the side. It should be noted that the term "when worn" as used herein means a state in which the absorbent article is maintained in a normal and appropriate wearing position, that is, in a correct wearing position of the absorbent article.

As the topsheet 3, the backsheet 4 and the absorbent body 5, those conventionally used in this type of absorbent article can be used without particular limitation. As the surface sheet 3, for example, various nonwoven fabrics and perforated films can be used. As the backsheet 4, for example, a resin film or a laminate of a resin film and a nonwoven fabric can be used. The absorbent body 5 contains an absorbent material, and as this absorbent material, those used as materials for absorbent bodies in this type of absorbent article can be used without particular limitation. Synthetic fibers that have undergone chemical treatment, water-absorbent polymers, and the like can be mentioned. The absorbent body 5 only needs to contain an absorbent material, and its form is not particularly limited. of absorbent structures.

As shown in FIG. 2, the absorbent body 5 of the present embodiment includes an absorbent core 50 containing an absorbent material and a core wrap sheet covering the outer surface (skin-facing surface, non-skin-facing surface) of the absorbent core 50. 51. The absorbent core 50 is typically a fiber stack formed by stacking absorbent materials. As the core wrap sheet 51, for example, liquid-permeable sheets such as paper, various nonwoven fabrics, and perforated films can be used. The absorbent core 50 and the core wrap sheet 51 may be joined by a known joining means such as a hot-melt adhesive.

The core wrap sheet 51 may be composed of one sheet, or may be composed of a plurality of sheets. The core wrap sheet 51 composed of one sheet has a width of, for example, two to three times the length of the absorbent core 50 in the lateral direction Y, and covers the entire skin-facing surface of the absorbent core 50. and extend outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent core 50, and the extending portion is wrapped around the non-skin facing surface side of the absorbent core 50, The entire non-skin facing surface of the absorbent core 50 can be covered. In the core wrap sheet 51 composed of one sheet, the part covering the skin-facing surface of the absorbent core 50 covers the skin-side core wrap sheet 52 and the non-skin facing surface of the absorbent core 50. The part is the non-skin side core wrap sheet 53 . In addition, the core wrap sheet 51 composed of a plurality of sheets includes, for example, one skin-side core wrap sheet 52 that covers the skin-facing surface of the absorbent core 50, and a sheet 52 that is separate from the absorbent core wrap sheet 52. and one non-skin-side core wrap sheet 53 covering the non-skin-facing surface of the elastic core 50 .

The flap part 6 is configured by a member extending outward from the peripheral edge of the absorbent main body 2, and is a non-absorbent part. In this embodiment, as shown in FIG. 2, the topsheet 3 covers the entire skin-facing surface of the absorbent body 5, and the backsheet 4 covers the entire non-skin-facing surface of the absorbent body 5. The sheets 3 and 4 further extend outward in the lateral direction Y from both side edges of the absorbent body 2 along the longitudinal direction X, and are part of the flap portion 6 (absorbent body 2 along the longitudinal direction X and side flap portions extending outward in the lateral direction Y from imaginary extension lines of the both side edges. A plurality of members forming the flap portion 6 are joined together by a known joining means such as an adhesive, heat sealing, ultrasonic sealing, or the like.

As shown in FIGS. 1 and 2, along both sides along the longitudinal direction X of the absorbent main body 2 (the laminated structure), there are provided leak-proof cuffs 7 that stand up toward the wearer's skin when worn. It is More specifically, a pair of cuff-forming sheets 70 that are liquid-resistant or water-repellent and breathable are included on both sides of the skin-facing surface of the absorbent main body 2 along the longitudinal direction X. Leak-proof cuffs 7, 7 are arranged. Each of the pair of leakage-preventing cuff forming sheets 70, 70 has one end side in the horizontal direction Y fixed to another member (the top sheet 3 and the back sheet 4 in the illustrated embodiment), and the fixed end portion in the horizontal direction Y. The other end is a free end that is not fixed to another member, and a thread-like or band-like leak-proof cuff-forming elastic member 71 is fixed to the free end while being stretched in the longitudinal direction X. As shown in FIG. When the diaper 1 is worn, the contractile force of the leak-preventing cuff-forming elastic member 71 causes the free end side of the leak-preventing cuff-forming sheet 70 at least in the crotch portion B to rise from the fixing portion 72 to another member. As a result, the leak-proof cuff 7 is prevented from flowing outward in the lateral direction Y of excrement such as urine.

A plurality of thread-like or band-like waist gather forming elastic members 11 are stretched in the lateral direction Y at the flap portions 6 at the ends in the longitudinal direction X of the abdominal portion A and the dorsal portion C, that is, at the waist ends. The plurality of elastic members 11 are intermittently arranged in the vertical direction X at predetermined intervals. Since the elastic member 11 is arranged in such a manner that its stretchability is exhibited, the waist end portions of the abdominal side portion A and the dorsal side portion C, which are the portions where the elastic member 11 is arranged, substantially stretch over the entire circumference. A continuously continuous annular waist gather is formed. In addition, leg gather forming elastic members 12 stretched in the longitudinal direction X are arranged at the leg portions of the flap portion 6 around the legs of the wearer when the diaper 1 is put on, and the leg gather forming elastic members 12 extend at least in the longitudinal direction X of the crotch portion B. When the diaper 1 is worn, the elastic members 12 contract to form leg gathers in the leg portions. These gather forming elastic members 11 and 12 are all formed from a plurality of sheets (in this embodiment, two kinds of the top sheet 3, the back sheet 4, and the leakage prevention cuff forming sheet 70) that constitute the flap portion 6. It is sandwiched and fixed between them by a bonding means such as an adhesive.

As shown in FIGS. 1 and 2, the absorbent main body 2 has a laminated structure 20 that absorbs and retains bodily fluid excreted by the wearer, ie, excrement. FIG. 3 shows an enlarged view of part of the laminated structure 20 . The laminated structure 20 includes a first layer 21 positioned relatively close to the wearer's skin, a third layer 23 positioned relatively far from the wearer's skin, and the first layer 21 . and a second layer 22 disposed between the third layer 23 .

The absorbent main body 2 of this embodiment, as shown in FIG. The first layer 21 and the skin-side core wrap sheet 52 are the second layer 22 and the absorbent core 50 is the third layer 23 . No other layer is interposed between these three layers, and these three layers are adjacent and in contact with each other in the thickness direction.

Since the laminated structure 20 plays a role of absorbing and holding excrement, it is preferably arranged at least in the portion facing the excretion portion, more specifically, at least in the center of the crotch portion B in the lateral direction Y. It is preferably placed in the department. In this embodiment, since substantially the entire absorbent main body 2 is the laminated structure 20, the arrangement portion of the absorbent main body 2 is also substantially the arranged portion of the laminated structure 20. It is arranged over the entire length of the crotch part B in the vertical direction X in the central part in the direction Y.

As shown in FIG. 3, the first layer 21 has a depression 21a on its skin-facing surface, and the third layer 23 has a depression 23a on its skin-facing surface. The recesses 21a and 23a are recessed portions from the skin-facing surface side to the non-skin-facing surface side, and can also be called recesses.

In the present embodiment, the recessed portion 23a of the third layer 23 is a through hole penetrating the third layer 23 in the thickness direction, whereas the recessed portion 21a of the first layer 21 is not a through hole but has a bottom. . That is, the material for forming the third layer 23 does not exist in the recessed portion 23a of the third layer 23, and the basis weight at the position where the recessed portion 23a is formed is zero. , the material for forming the first layer 21 exists, and the basis weight at the position where the recess 21a is formed is not zero. The recesses according to the present invention include penetrating recesses such as recess 23a and non-penetrating recesses having a bottom such as recess 21a. Moreover, the basis weight at the formation position of the non-penetrating recess may be greater, smaller, or equal to the basis weight of the peripheral portion. Even if the basis weight at the position where the non-penetrating recess is formed is equal to or greater than the basis weight of the peripheral part, for example, the recess is a portion compressed in the thickness direction at the position where the recess is formed. In particular, the recessed portion is recessed more than the peripheral portion.

The method of forming the recessed portion according to the present invention is not particularly limited. As an example of a method of forming a non-penetrating recess such as the recess 21a, the first layer 21 (surface sheet 3) having no recess and having a flat surface is manufactured, and the first layer 21 is subjected to a predetermined treatment. Examples include a method of subjecting the site to compression processing such as embossing with or without heat. The formation positions of the recessed portions 21a formed by such a method are compressed in the thickness direction, and therefore have a higher density than the peripheral portion. If the recessed portion 21a is to be a penetrating recessed portion, die-cutting, cutting, or the like may be adopted instead of pressing, and the material of the portion to be formed of the recessed portion 21a may be eliminated. In particular, as another example of a method of forming a penetrating or non-penetrating depression in the absorbent core 50, in the process of stacking an absorbent material such as wood pulp at the time of manufacturing the absorbent core 50, , a method of intentionally inhibiting the stacking of the absorbent material in the portion where the recess is to be formed. The method for forming such recesses can be carried out in a conventionally known method for manufacturing an absorbent core. In the method of manufacturing the absorbent core 50 by sucking and depositing the It can be implemented by

In the present embodiment, the skin-facing surface of the first layer 21 has a plurality of depressions 21a and a plurality of projections 21b protruding toward the wearer's skin. That is, the first layer 21 of this embodiment has an uneven structure including a plurality of depressions 21a, that is, depressions and a plurality of projections 21b, on its skin-facing surface.

The pattern of the concavo-convex structure in the first layer 21, that is, the shape and arrangement of each of the depressions 21a and the projections 21b is not particularly limited, and various patterns can be employed without departing from the scope of the present invention. As a typical pattern of the concave-convex structure of the first layer 21, there is a pattern in which concave portions 21a and convex portions 21b are alternately arranged in the lateral direction Y, as shown in FIG. An example of the uneven structure pattern of the first layer 21 is a pattern in which a plurality of depressions 21a are arranged in a scattered pattern on the skin-facing surface, and each depression 21a is surrounded by a plurality of projections 21b. Another example of the pattern of the uneven structure of the first layer 21 is a pattern in which recessed portions 21a extending in the longitudinal direction X and convex portions 21b extending in the longitudinal direction X are alternately arranged in the lateral direction Y. be done. The shape of the recessed portion 21a and the convex portion 21b in plan view is not particularly limited, and may be, for example, a circle, an ellipse, a triangle, a quadrangle, a polygon with pentagons or more, a straight line, or a curved line.

The recessed portion 23a of the present embodiment has a rectangular shape in plan view as shown in FIG. In this embodiment, a plurality of (three in the illustrated embodiment) recessed portions 23a extending in the longitudinal direction X are intermittently arranged in the lateral direction Y in the crotch portion B. As shown in FIG. The pattern of the depressions 23a in the third layer 23, that is, the shape and arrangement of the depressions 23a is not particularly limited, and various patterns can be employed without departing from the scope of the present invention.

As shown in FIG. 3 , a space corresponding to the depression 23 a of the third layer 23 exists between the second layer 22 and the third layer 23 . No other layer is interposed between the second layer 22 and the third layer 23, and the non-skin facing surface of the second layer 22 and the skin facing surface of the third layer 23 are adjacent while being in contact with each other. Therefore, the recessed portion 23a itself existing on the skin-facing surface of the third layer 23 becomes a space (gap) existing between the layers 22 and 23. As shown in FIG. Therefore, normally, the number of spaces existing between the second layer 22 and the third layer 23 is the same as the number of the depressions 23a that the third layer 23 has. In this embodiment, as shown in FIG. 2, the third layer 23 has three recessed portions 23a. There are three spaces with one-to-one correspondence to 23a.

As shown in FIG. 3, the laminate structure 20 is provided with an antimicrobial agent 24 . One of the main features of the diaper 1 is that the second layer 22 or the third layer 23 contains the antibacterial agent 24, and the depressions 21a of the first layer 21 and the depressions 23a of the third layer 23 are One of the points is that it exists at a position overlapping the antibacterial agent placement region where the antibacterial agent 24 is placed in the projected view in the thickness direction of the laminated structure 20 . As used herein, the term "antibacterial agent placement area" means an area in which the antibacterial agent is arranged at a higher density than the surrounding area, and is typically coated or sprayed with an antibacterial agent or a composition containing an antibacterial agent. It is a part that is given by being given, and has a certain amount of spread. In the present invention, one layer constituting the laminated structure 20 may have one or two or more antibacterial agent placement regions in a plan view.

In this embodiment, as shown in FIG. 3, the second layer 22 contains an antibacterial agent 24, thereby improving the antibacterial properties of the second layer 22 (skin-side core wrap sheet 52). 3, one of the three recessed portions 23a shown in FIG. 2 is shown enlarged together with its vicinity, but the other two recessed portions 23a and their vicinity are also shown in FIG. configured similarly.

In a laminated structure consisting of a surface sheet, a skin-side core wrap sheet and an absorbent core, it is conventional practice to incorporate an antibacterial agent into the surface sheet and/or the skin-side core wrap sheet. In order to obtain a predetermined antibacterial effect, the antibacterial agent contained in the sheet must be eluted as body fluids such as urine pass through the surface sheet and the skin-side core wrap sheet in the thickness direction. However, since the time for body fluids such as urine to pass through the surface sheet and the skin-side core wrap sheet in the thickness direction is usually extremely short, the conventional technology does not release much of the antibacterial agent as the body fluids pass through, resulting in the expected antibacterial effect. The fact is that it is not effective.

Therefore, in the present invention, in order to make the most of the antibacterial effect of the antibacterial agent, it is possible to temporarily store body fluids in a predetermined position of the laminated structure of the absorbent article, and the stored body fluids and the laminated structure are combined. The elution efficiency of the antibacterial agent is improved by allowing the antibacterial agent placement region arranged at a predetermined location to come into contact with the area for a relatively long time. Specifically, as described above, in the laminated structure 20, 1) the first layer 21 (topsheet 3) has a depression 21a on the skin-facing surface, and the third layer 23 (absorbent core 50) is 2) a space corresponding to the recessed portion 23a of the third layer 23 exists between the second layer 22 (skin-side core wrap sheet 52) and the third layer 23; 3) the second layer 22 or the third layer 23 contains the antibacterial agent 24; It exists in a position that overlaps with the antibacterial agent placement area. Regarding the above 3), in this embodiment, the second layer 22 contains an antibacterial agent 24 as shown in FIG. 1) above is adopted, and the first layer 21 and the third layer 23 have depressions 21a and 23a on their skin-facing surfaces, so that both layers 21 and 23 do not have depressions and their skin-facing surfaces are flat. Since the liquid retention of both layers 21 and 23 is improved compared to the case where both layers 21 and 23 can temporarily store the body fluid in both layers 21 and 23, the elution time of the antibacterial agent 24 can be earned. becomes. In addition, by adopting the above 2) to 4), the space (gap) formed by the recessed portion 23a existing between the second layer 22 and the third layer 23 is filled with the recessed portion 21a of the first layer 21. It is possible to temporarily store the body fluid that has passed through the formation site and the second layer 22 and keep the stored fluid in contact with the antibacterial agent 24 for a relatively long time. The diaper 1 has excellent antibacterial properties because the antibacterial agent 24 can be sufficiently eluted from its initial arrangement position (antibacterial agent arrangement area) by such cooperation of 1) to 4). It is possible to effectively suppress the inconveniences caused by the growth of the fungi from which it originated, such as skin troubles on the wearer and the generation of unpleasant odors when worn.

In particular, in this embodiment, as shown in FIG. 3 as described above, a plurality of depressions 21a (recesses) and protrusions 21b are present on the skin-facing surface of the first layer 21, and the skin-facing surface has an uneven structure. Therefore, compared with the case where the skin-facing surface of the first layer 21 does not have such an uneven structure, the liquid retention is improved, and the elution of the antibacterial agent 24 can be further promoted.

From the viewpoint of improving the liquid retention of the first layer 21, the ratio of the total area of the recesses 21a to the area of the skin-facing surface of the first layer 21 is preferably 1% or more, more preferably 3% or more, and , preferably 15% or less, more preferably 12% or less. When the area ratio of the depressions 21a on the skin-facing surface of the first layer 21 is within this range, the first layer 21 has improved liquid retention properties and the liquid can easily pass through the first layer 21 .

A recess depth 23D (see FIG. 3) of the recess portion 23a of the third layer 23 is preferably deeper than a recess depth 21D (see FIG. 3) of the recess portion 21a of the first layer 21. FIG. In the laminated structure 20, the antibacterial agent 24 is basically arranged on the side farther from the wearer's skin than the first layer 21. Therefore, in order to promote the elution of the antibacterial agent 24 accompanying the passage of bodily fluids, Since it is preferable that the body fluid stays in the second layer 22 and/or the third layer 23 for as long as possible, such a preferable state can be stably created by establishing a magnitude relation of 23D>21D with respect to the depth of the depression. can be

The ratio of the recess depth 23D to the recess depth 21D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less, as 23D/21D, on the premise that 23D>21D. be.
The recess depth 23D of the recess 23a of the third layer 23 is preferably 0.05 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 8 mm or less.
The recess depth 21D of the recess portion 21a of the first layer 21 is preferably 0.05 mm or more, more preferably 0.075 mm or more, and preferably 1 mm or less, more preferably 0.8 mm or less.
The recess depth of the recess of each layer (the first layer 21, the second layer 22, or the third layer 23) constituting the laminated structure is measured by the following method.

<Method for Measuring Depth of Recess>
A sheet to be measured (a layer to be measured in the laminated structure) is taken out from the absorbent article, and the taken out sheet is 50 mm long in the vertical direction (longitudinal direction) and 50 mm in length in the horizontal direction (width direction) of the absorbent article. A cut piece of the sheet is produced by cutting into a square shape of 50 mm in plan view. However, if a cut piece of this size cannot be produced, a cut piece as large as possible is produced.
Using a microscope (VHX-1000 manufactured by Keyence Corporation) under conditions of a temperature of 20±2° C. and a relative humidity of 65±5%, an enlarged photograph of the cut surface of the cut piece is obtained. From the enlarged photograph, the depth of the three recessed portions is measured by taking the deepest portion of the recessed portion as the depth of the recessed portion. The average value of the three points is taken as the recess depth of the recessed portion of the sheet to be measured.

In the third layer 23 (the absorbent core 50 in this embodiment), it is preferable that the basis weight of the formation position of the recessed portion 23a is lower than the basis weight of the peripheral portion thereof. Here, the “peripheral portion of the recessed portion 23a” is a non-recessed portion adjacent to the recessed portion 23a in the surface direction of the third layer 23, typically within 10 mm from the recessed portion 23a in the surface direction. is the part of As described above, the recessed portion 23a of the present embodiment is a penetrating recessed portion, and the basis weight at the formation position thereof is zero. The size relationship of "basis weight" is established. Even when the recessed portion 23a of the third layer 23 is a non-penetrating recessed portion like the recessed portion 21a of the first layer 21, it is preferable that such a magnitude relationship is established. By establishing such a size relationship, body fluid stocked in the recessed portion 23a is suppressed from diffusing in the surface direction of the third layer 23 (direction perpendicular to the thickness direction). The liquid holding property of the hollow portion 23a, which is the space between the third layer 23 and the third layer 23, is further improved, and the elution of the antibacterial agent 24 can be further promoted. In particular, it is preferable that the recessed portion 23a is a penetrating recessed portion as in the present embodiment, because the diffusion of the bodily fluid stocked in the recessed portion 23a is easily suppressed.

In the case where the recessed portion 23a of the third layer 23 is a non-penetrating recessed portion, the ratio of the basis weight at the formation position of the non-penetrating recessed portion 23a to the basis weight at the peripheral portion is such that the former < the latter. As a premise, the former/latter is preferably 0.08 or more, more preferably 0.1 or more, and preferably 0.8 or less, more preferably 0.6 or less.
The basis weight of the non-penetrating depression 23a is preferably 50 g/m ² or more, more preferably 100 g/m ² or more, and preferably 500 g/m ² or less, more preferably 400 g/m ² or less.

Although the composition of the third layer 23 (the absorbent core 50 in this embodiment) is not particularly limited, it preferably contains cellulose fibers and a water-absorbing polymer from the viewpoint of improving liquid retention of the third layer 23 . As the cellulose fiber and the water-absorbent polymer, those that can be used as a material for forming the absorbent body in this type of absorbent article can be used without particular limitation. Cellulose fibers include, for example, wood pulp such as softwood pulp and hardwood pulp; natural fibers such as non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and mercerized pulp; regenerated cupra and rayon. fibers, etc., and these can be used singly or in combination of two or more. As the water-absorbing polymer, a particulate one is generally used, but a fibrous one may also be used. When a particulate water-absorbing polymer is used, its shape may be spherical, blocky, bale-shaped, or irregular. The average particle size of the water-absorbing polymer is preferably 10 μm or more, more preferably 100 μm or more, and preferably 1000 μm or less, more preferably 800 μm or less. As the water-absorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can be used. Examples include polyacrylic acid and its salts and polymethacrylic acid and its salts.

The content of cellulose fibers in the third layer 23 is preferably 20% by mass or more, more preferably 30% by mass or more, and preferably 80% by mass or less, more preferably It is 70% by mass or less.
The content of the water-absorbing polymer in the third layer 23 is preferably 20% by mass or more, more preferably 30% by mass or more, and preferably 80% by mass or less, more preferably 80% by mass or less, with respect to the total mass of the third layer 23. is 70% by mass or less.

From the viewpoint of improving the liquid retention property of the third layer 23 , the third layer 23 preferably has lower liquid permeability than the second layer 22 .

Also, the second layer 22 preferably has lower liquid permeability than the first layer 21 . In the laminated structure 20, basically, the antibacterial agent 24 is arranged on the side farther from the wearer's skin than the first layer 21, so the liquid permeability of the second layer 22 is lower than that of the first layer 21. is set low, the body fluid stays in the antibacterial agent placement area where the antibacterial agent 24 is placed for a relatively long time, and the elution of the antibacterial agent 24 can be further promoted.

The liquid permeability of each layer (first layer 21, second layer 22, or third layer 23) constituting the laminated structure 20 is measured using a strike-through time measuring device Lister manufactured by Lenzing Technik. Liquid Strike-Through Time" can be used as an index for evaluation. Liquid Strike-Through Time is the time (seconds) required for a predetermined amount of physiological saline to pass from the front surface of the measurement material (eg, the first layer 21) to the back surface (from the skin-facing surface to the non-skin-facing surface). ). It can be evaluated that the longer the Liquid Strike-Through Time, the lower the liquid permeability of the layer, and conversely, the shorter the Liquid Strike-Through Time, the higher the liquid permeability of the layer.

<Method for measuring Liquid Strike-Through Time>
Ten sheets of exclusive filter paper are stacked on the pedestal of the measuring device (Lister), and the material to be measured is placed thereon. At this time, the non-skin-facing surface of the measurement material (one of the layers constituting the laminated structure 20) faces the filter paper side, and the skin-facing surface of the measurement material is the upper surface. Next, a strike-through plate having electrodes is placed on the upper surface of the material to be measured, and physiological saline (Japanese Pharmacopoeia physiological saline Otsuka Saline Injection manufactured by Otsuka Pharmaceutical Co., Ltd.) is supplied from a liquid inlet connected to the strike-through plate. (trade name)) is added, and then the power of the measurement device is turned on. The time (seconds) from when the physiological saline is in contact with the electrodes to when the physiological saline passes through the material to be measured and the potential drops until it is no longer in contact with the electrodes is calculated. The measurement is performed three times, and the average value is defined as the Liquid Strike-Through Time of the material to be measured.

In the present embodiment, as shown in FIGS. 1 and 2, along both sides of the laminated structure 20 (absorbent main body 2) along the longitudinal direction X, there is provided an anti-wrinkle that stands up toward the wearer's skin when worn. A leakage cuff 7 is provided. As described above, when the diaper 1 is worn, the leakage-preventing cuffs 7 are erected by contraction force of the leakage-preventing cuff forming elastic members 71 so that the free end side of the leakage-preventing cuff forming sheet 70 is at least at the crotch portion B. , and the fixing part 72 to another member is used as a standing base end to stand up on the wearer's side. When the leakage-preventing cuffs 7 that can stand up when worn are arranged on both sides of the laminated structure 20 in the lateral direction Y, the laminated structure 20 is formed by the influence of the standing-up of the leakage-preventing cuffs 7 in the upright state. Wrinkles may be formed in at least one of the layers (first layer 21, second layer 22, third layer 23). The wrinkles are usually formed on the outer surface (skin-facing surface, non-skin-facing surface) of the layer. In this way, the wrinkles formed in the laminated structure 20 by erecting the leak-preventive cuff 7 can function as a site where body fluid can be temporarily stocked, so that the liquid retention of the laminated structure 20 as a whole is improved, and the antibacterial agent 24 is removed. Sufficient elution time can be obtained.

The concave-convex structure including the depressions 21a on the skin-facing surface of the first layer 21 does not have to be inherent to the first layer 21 (the topsheet 3 in this embodiment). Wrinkles formed on the skin-facing surface of the first layer 21 in the upright state of the leak-proof cuff 7 may also be used. That is, when the leak-preventing cuffs 7 are not erected, that is, when the diaper 1 is not worn, the skin-facing surface of the first layer 21 is a flat surface without an uneven structure. When worn, wrinkles may be formed on the skin-facing surface of the first layer 21, resulting in the formation of depressions 21a on the skin-facing surface.

In the laminated structure 20, at least one of the second layer 22 and the third layer 23 may contain the antibacterial agent 24, and the first layer 21 may not contain the antibacterial agent 24, but the first layer If 21 contains an antibacterial agent 24, antibacterial properties can be further improved.

4 to 7 show other embodiments of the laminated structure according to the invention. Regarding other embodiments described later, the constituent parts different from the laminated structure 20 described above will be mainly explained, and the same constituent parts will be denoted by the same reference numerals, and the explanation thereof will be omitted. The description of the laminated structure 20 is appropriately applied to components that are not particularly described.

In the laminated structure 20A shown in FIG. 4, both the first layer 21 and the third layer 23 contain the antibacterial agent 24. As shown in FIG. In the laminated structure 20A, the first layer 21 is the skin-side core wrap sheet 52, the second layer 22 is the absorbent core 50, and the third layer 23 is the non-skin-side core wrap sheet 53. Recessed portion 21a (uneven structure) on the skin-facing surface of the first layer 21 (skin-side core wrap sheet 52) and recessed portion 23a (uneven structure) on the skin-facing surface of the third layer 23 (non-skin-side core wrap sheet 53) may be inherently present in the layers 21, 23, i.e. always present, as described above respectively, or may be caused by wear of the diaper 1, such as wrinkles formed when the leak-proof cuffs 7 are standing up. It may be formed from time to time. In laminated structure 20A, first layer 21 may not contain antimicrobial agent 24 .

In the laminated structure 20A, as shown in FIG. 4, the second layer 22 (absorbent core 50) has a depression 22a on the skin facing surface. In this way, in addition to the first layer 21 and the third layer 23, the recessed portion 22a is formed on the skin-facing surface of the second layer 22, thereby further improving the liquid retention of the laminated structure 20A. Elution of the antibacterial agent 24 can be further promoted. In the embodiment shown in FIG. 4, the recessed portion 22a is a through hole (through recessed portion) that penetrates the second layer 22 in the thickness direction, but it may be a non-penetrating recessed portion such as the recessed portions 21a and 23a. .

The recess depth 22D (see FIG. 4) of the recessed portion 22a of the second layer 22 is preferably deeper than the recessed depth 21D (see FIG. 4) of the recessed portion 21a of the first layer 21. As shown in FIG. The reason for this is the same as the above-mentioned reason that it is preferable to establish the relationship of "recess depth 23D of recess 23a of third layer 23>recess depth 21D of recess 21a of first layer 21".

The ratio of the recess depth 22D to the recess depth 21D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less, as 22D/21D, on the premise that 22D>21D. be.
The recess depth 22D of the recess 22a of the second layer 22 is preferably 0.05 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 8 mm or less.

Note that when the second layer 22 has the recessed portion 22a on the skin-facing surface as in the laminated structure 20A, the depth 22D of the recessed portion 22a of the second layer 22 and the depth of the recessed portion 23a of the third layer 23 The recess depth 23D may be the same or different. In the form shown in FIG. 4, 22D>23D.

On the other hand, when 22D<23D, that is, when the recess depth 23D of the recessed portion 23a of the third layer 23 is deeper than the recessed depth 22D of the recessed portion 22a of the second layer 22, body fluid is most likely to accumulate in the laminated structure. The third layer 23, which is a layer, is preferable because the bodily fluid stays there for a relatively long time and the elution of the antibacterial agent 24 is further accelerated. The ratio of the recess depth 23D and the recess depth 22D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less, as 23D/22D, on the premise that 23D>22D. be.

Although not shown in FIG. 4, there are a plurality of penetrating or non-penetrating depressions 22a on the skin-facing surface of the second layer 22, and a plurality of projections protruding toward the wearer's skin. may exist. For example, in the laminated structure 20A, if the recessed portion 22a of the second layer 22 is a non-penetrating recessed portion, the skin-facing surface of the second layer 22 is the skin-facing surface of the first layer 21 or the third layer 23 . You may have the uneven structure similar to. With such a configuration, the liquid retention of the second layer 22 can be further improved, and the elution of the antibacterial agent 24 can be further promoted.

From the viewpoint of achieving the above-described effects more reliably, the ratio of the total area of the recesses 22a to the area of the skin-facing surface of the second layer 22 is preferably 1% or more, more preferably 3%. above, preferably 15% or less, more preferably 12% or less. Such a ratio can improve the liquid retention of the second layer 22 . The area of the recessed portion of each layer (first layer 21, second layer 22, or third layer 23) constituting the laminated structure is measured by the following method.

<Method for measuring the area of the recess>
A sheet to be measured (a layer to be measured in the laminated structure) is taken out from the absorbent article, and the taken out sheet is 50 mm long in the vertical direction (longitudinal direction) and 50 mm in length in the horizontal direction (width direction) of the absorbent article. A cut piece of the sheet is produced by cutting into a square shape of 50 mm in plan view. However, if a cut piece of this size cannot be produced, a cut piece as large as possible is produced.
Using a microscope (manufactured by Keyence Corporation, VHX-1000) at a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 5%, an enlarged photograph of the plane of the cut piece (skin facing surface or non-skin facing surface) obtain. Measure the area of the recess from the enlarged photograph. The area of the three recessed portions is measured, and the average value of the three points is taken as the area of the recessed portion of the sheet to be measured.

In the laminated structure 20B shown in FIG. 5, the third layer 23 contains the antibacterial agent 24. As shown in FIG. In the laminated structure 20B, the surface sheet 3 has a two-layer structure. The second layer 22 is the non-skin side layer relatively far from the . The third layer 23 is the skin-side core wrap sheet 52 arranged adjacent to the non-skin-facing surface of the topsheet 3 having a two-layer structure. Recessed portion 21a (uneven structure) of the skin-facing surface of the first layer 21 (skin-side layer of the topsheet 3) and recessed portion 23a (uneven-structured structure) of the skin-facing surface of the third layer 23 (skin-side core wrap sheet 52) may be inherently present in the layers 21, 23, i.e. always present, as described above respectively, or may be caused by wear of the diaper 1, such as wrinkles formed when the leak-proof cuffs 7 are standing up. It may be formed from time to time. In the laminated structure 20B, the first layer 21 (the skin-side layer of the topsheet 3) and/or the second layer 22 (the non-skin-side layer of the topsheet 3) may contain the antibacterial agent 24.

In the laminated structure 20C shown in FIG. 6, the recessed portion 23a of the third layer 23 is a non-penetrating recessed portion. The laminated structure 20C is the same as the laminated structure 20 shown in FIG. 3 except for the above points.

In the laminated structure 20D shown in FIG. 7, the third layer 23 contains the antibacterial agent 24. As shown in FIG. In the laminated structure 20D, an intermediate sheet 25, also called a sublayer or second sheet, is interposed between the surface sheet 3 (first layer 21) and the skin-side core wrap sheet 52 (third layer 23). , and the intermediate sheet 25 is the second layer 22 . As the intermediate sheet 25, for example, a liquid-permeable sheet such as nonwoven fabric or paper can be used. The depressions 21a (uneven structure) on the skin-facing surface of the first layer 21 (topsheet 3) and the depressions 23a (unevenness structure) on the skin-facing surface of the third layer 23 (skin-side core wrap sheet 52) are described above. As mentioned, it may be inherent to the layers 21, 23, i.e. always present, or may be formed when the diaper 1 is worn, such as wrinkles formed in the upright position of the leakproof cuff 7, for example. Anything is fine. In the laminated structure 20D, the second layer 22 (intermediate sheet 25) may contain the antibacterial agent 24 instead of the third layer 23 (skin-side core wrap sheet 52), or in addition to the third layer 23, a third layer may be added. The first layer 21 (topsheet 3) and/or the second layer 22 may contain an antimicrobial agent 24.

In the laminated structure according to the present invention, including the laminated structures 20, 20A, 20B, 20C, and 20D described above, the first layer 21 may have a fused portion in which constituent fibers (synthetic fibers) are fused together. good. A specific example of the first layer 21 having a fused portion is the surface sheet 3 including a nonwoven fabric. The fused portion has lower liquid permeability than the non-fused portion, and is a portion that is difficult for body fluids such as urine to pass through. is reduced, and the liquid retention of the first layer 21 can be improved. Moreover, it is preferable that the fusion-bonded portion of the first layer 21 exists at the formation position of the recessed portion 21a of the first layer 21 . In other words, it is preferable that the portion defining the bottom of the non-penetrating recess 21a be the fused portion, whereby the liquid holding property of the first layer 21 can be further improved. As a method of forming the fused portion at the position where the recessed portion 21a is to be formed, for example, the first layer 21 (surface sheet 3) having no recessed portion and having a flat surface is manufactured, and the first layer 21 is A method of subjecting a predetermined portion to compression processing such as embossing accompanied by heat may be used. By such pressing, the material of the pressed portion is heated and melted to form the fused portion.

From the viewpoint of ensuring that the effects of the fused portions are exhibited more reliably, the ratio of the total area of the fused portions to the area of the skin-facing surface of the first layer 21 (hereinafter referred to as the "fused portion area ratio ” is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 12% or less. When the fused portion area ratio of the skin-facing surface of the first layer 21 is within such a range, the first layer 21 can have both liquid retention and liquid permeability at a higher level. The fused portion area ratio of one surface (skin-facing surface or non-skin-facing surface) of each layer (first layer 21, second layer 22, or third layer 23) constituting the laminated structure is measured by the following method. .

<Method for measuring fused portion area ratio>
A sheet to be measured (a layer to be measured in the laminated structure) is taken out from the absorbent article, and the taken out sheet is 50 mm long in the vertical direction (longitudinal direction) and 50 mm in length in the horizontal direction (width direction) of the absorbent article. A cut piece of the sheet is produced by cutting into a square shape of 50 mm in plan view. However, if a cut piece of this size cannot be produced, a cut piece as large as possible is produced.
Using a microscope (manufactured by Keyence Corporation, VHX-1000) at a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 5%, an enlarged photograph of the plane of the cut piece (skin facing surface or non-skin facing surface) obtain. The number of fused portions is counted from the enlarged photograph, the area of each fused portion is measured in plan view, and the area is multiplied by the number of fused portions to obtain the total area of the fused portions. Next, by dividing the total area of the fused portion by the area of the plane of the cut piece on which the enlarged photograph was taken, the area of the fused portion per unit area is calculated and taken as the fused portion area ratio of the surface.

Also, the second layer 22 may have a fused portion in which constituent fibers (synthetic fibers) are fused together. Specific examples of the second layer 22 having a fused portion include the skin-side core wrap sheet 52, the absorbent core 50, or the intermediate sheet 25, which are composed of a nonwoven fabric. Further, as shown in FIG. 5, when the non-skin layer of the topsheet 3 having a two-layer structure includes a non-woven fabric, the non-skin layer may have a fused portion. Since the second layer 22 has the fused portion, the liquid permeability of the second layer 22 is lowered, and the liquid retention property of the second layer 22 can be improved. Moreover, it is preferable that the fusion-bonded portion of the second layer 22 exists at the formation position of the recessed portion 22a of the second layer 22 . That is, it is preferable that the portion defining the bottom of the non-penetrating recessed portion 22a be the fused portion. The recessed portion 22a of the second layer 22 can be formed by the same method as the method of forming the recessed portion 21a of the first layer 21 .

From the viewpoint of ensuring that the effects of the above-described fused portions are exhibited more reliably, the ratio of the total area of the fused portions to the area of the skin-facing surface of the second layer 22 is preferably 1% or more, and more preferably 1% or more. It is preferably 3% or more, preferably 15% or less, more preferably 12% or less. When the area ratio of the fused portion on the skin-facing surface of the second layer 22 is within this range, the second layer 22 can have both liquid retention and liquid permeability at a higher level.

When the second layer 22 has a recessed portion 22a on the skin-facing surface, a portion where the recessed portion 21a of the first layer 21 and the recessed portion 22a of the second layer 22 are integrally recessed (hereinafter referred to as “two-layer integrated recess Also referred to as "part") exists, and the constituent fibers (synthetic fibers) of the second layer 22 in the two-layer integrated recess are preferably fused together. Usually, the part that defines the bottom of the two-layer integrated recess is the weld. Due to the presence of the two-layer integrated recess, body fluids tend to accumulate in the first layer 21 and the second layer 22, which are the two layers closest to the wearer's skin in the laminated structure, and the antibacterial agent 24 is more eluted. can be further promoted. The two-layer integrated recess portion is formed by subjecting the laminate to a pressing process such as embossing accompanied by heat from the first layer 21 side in a state in which the first layer 21 and the second layer 22 are laminated. can be formed by

As the antibacterial agent used in the present invention, those that can be incorporated in this type of absorbent article can be used without particular limitation, and may be an inorganic antibacterial agent or an organic antibacterial agent, one type alone or two or more types. can be used in combination. Specific examples of inorganic antibacterial agents include silver-supported zeolite and titanium oxide. Specific examples of organic antibacterial agents include sodium dodecyl sulfate, benzalkonium chloride, and alkylpolyaminoethylglycine hydrochloride.

In the laminated structure according to the present invention, the content of the antibacterial agent may be appropriately set according to the use of the absorbent article, the type of the antibacterial agent, etc., and is not particularly limited, but is preferably based on the total mass of the laminated structure. is 0.0005% by mass or more, more preferably 0.001% by mass or more, and preferably 0.05% by mass or less, more preferably 0.03% by mass or less. In general, the higher the content of the antibacterial agent in the laminated structure, the better the antibacterial properties. It can become too expensive.

From the same point of view, the basis weight of the antibacterial agent in the laminated structure according to the present invention is preferably 0.003 g/m ² or more, more preferably 0.005 g/m ² or more, and preferably 0.2 g/m ² 0.15 g/m 2 or less, more preferably 0.15 g/m ² or less.

The absorbent article of the present invention is not limited to an unfoldable disposable diaper as in the above embodiment, but broadly includes articles used for absorbing bodily fluids (urine, menstrual blood, loose stools, sweat, etc.) excreted from the human body, Pants-type disposable diapers, sanitary napkins, sanitary shorts, etc., which do not have a fastening structure such as fastening members 14 and fastening regions 15 are also included.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate.
For example, on the skin-facing surface of one layer (typically, the third layer made of the absorbent core) that constitutes the laminated structure, there may be a mixture of penetrating depressions and non-penetrating depressions. good.
All the parts that only one embodiment has as described above can be used interchangeably as appropriate. The following notes are further disclosed with respect to the above-described embodiments of the present invention.

<1>
An absorbent article having a laminated structure that absorbs and retains bodily fluid excreted by a wearer,
The laminated structure includes a first layer positioned relatively close to the wearer's skin, a third layer positioned relatively far from the wearer's skin, and the first layer and the third layer positioned relatively far from the wearer's skin. and a second layer disposed between the three layers,
Each of the first layer and the third layer has a depression on the skin-facing surface,
A space corresponding to the recess of the third layer exists between the second layer and the third layer,
The second layer or the third layer contains an antibacterial agent,
The absorbent article, wherein the recessed portion of the first layer and the recessed portion of the third layer overlap with the antibacterial agent arrangement region in which the antibacterial agent is arranged in plan view.
<2>
The absorbent article according to <1>, wherein the depth of the recess of the third layer is deeper than the depth of the recess of the first layer.
<3>
The absorbent article according to <2> above, wherein the ratio of the depth of the recesses of the third layer to the depth of the recesses of the first layer is 3 or more and 200 or less, preferably 10 or more and 150 or less. .
<4>
The absorbent article according to <3> or <4> above, wherein the recessed portion of the third layer has a depth of 0.05 mm or more and 10 mm or less, preferably 1 mm or more and 8 mm or less.
<5>
The absorbent article according to any one of <2> to <4> above, wherein the recessed portion of the first layer has a depth of 0.05 mm or more and 1 mm or less, preferably 0.075 mm or more and 0.8 mm or less.

<6>
Further, the absorbent article according to any one of <1> to <5>, wherein the first layer contains an antibacterial agent.
<7>
The absorbent article according to any one of <1> to <6>, wherein the first layer has a fused portion in which constituent fibers are fused together.
<8>
The absorbent article according to <7> above, wherein the ratio of the total area of the fused parts to the area of the skin-facing surface of the first layer is 1% or more and 15% or less, preferably 3% or more and 12% or less. .
<9>
Any one of <1> to <8> above, wherein the first layer has a plurality of depressions on the skin-facing surface and a plurality of projections protruding toward the wearer's skin. absorbent article.
<10>
The absorbent article according to <9> above, wherein the ratio of the total area of the recesses to the area of the skin-facing surface of the first layer is 1% or more and 15% or less, preferably 3% or more and 12% or less.

<11>
The absorbent article according to any one of <1> to <10>, wherein the second layer contains an antibacterial agent.
<12>
The absorbent article according to any one of <1> to <10>, wherein the second layer has a fused portion in which constituent fibers are fused together.
<13>
The absorbent article according to <12> above, wherein the ratio of the total area of the fused portions to the area of the skin-facing surface of the second layer is 1% or more and 15% or less, preferably 3% or more and 12% or less. .
<15>
The absorbent article according to any one of <1> to <14>, wherein the second layer has a recessed portion on the skin-facing surface.
<16>
The absorbent article according to <15>, wherein the depth of the recessed portion of the second layer is deeper than the depth of the recessed portion of the first layer.
<17>
<15> or <16> above, wherein the ratio of the depth of the recess of the second layer to the depth of the recess of the first layer is 3 or more and 200 or less, preferably 10 or more and 150 or less. absorbent article.
<18>
The absorbent article according to any one of <15> to <7>, wherein the depth of the recessed portion of the second layer is 0.05 mm or more and 10 mm or less, preferably 1 mm or more and 8 mm or less.
<19>
<15> to <, wherein there is a portion where the recessed portion of the first layer and the recessed portion of the second layer are integrally recessed, and the constituent fibers of the second layer in the portion are fused to each other; 18> The absorbent article according to any one of 18>.
<20>
Any one of <15> to <19> above, wherein the second layer has a plurality of depressions on the skin-facing surface, and a plurality of projections protruding toward the wearer's skin. absorbent article.
<21>
The absorbent article according to <20> above, wherein the ratio of the total area of the recesses to the area of the skin-facing surface of the second layer is 1% or more and 15% or less, preferably 3% or more and 12% or less.
<22>
The absorbent article according to any one of <1> to <21>, wherein the second layer has lower liquid permeability than the first layer.

<23>
The absorbent article according to any one of <1> to <22>, wherein the third layer contains an antibacterial agent.
<24>
The absorbent article according to any one of <1> to <23>, wherein, in the third layer, a basis weight at a position where the recess is formed is lower than a basis weight at a peripheral portion of the recess.
<25>
The absorbent article according to any one of <1> to <24>, wherein the recessed portion of the third layer is a through hole penetrating the third layer in the thickness direction.
<26>
The recessed portion of the third layer is a non-penetrating recessed portion, and the ratio of the basis weight at the position where the recessed portion is formed to the basis weight of the peripheral portion of the recessed portion is preferably 0.08 or more and 0.8 or less. is 0.1 or more and 0.6 or less.
<27>
The absorbent article according to <26>, wherein the basis weight at the position where the recess is formed is 50 g/m ² or more and 500 g/m ² or less, preferably 100 g/m ² or more and 400 g/m ^{2 or} less.
<28>
The second layer has a recessed portion on the skin-facing surface,
The absorbent article according to any one of <1> to <27>, wherein the depth of the recess of the third layer is greater than the depth of the recess of the second layer.
<29>
The absorbent article according to <28> above, wherein the ratio of the depth of the recesses of the third layer to the depth of the recesses of the second layer is 3 or more and 200 or less, preferably 10 or more and 150 or less.

<30>
The absorbent article according to any one of <1> to <29>, wherein the third layer contains cellulose fibers and a water absorbent polymer.
<31>
The absorbent article according to <30>, wherein the content of the cellulose fibers in the third layer is 20% by mass or more and 80% by mass or less, preferably 30% by mass or more and 70% by mass or less.
<32>
The absorbent article according to <30> or <31>, wherein the content of the absorbent polymer in the third layer is 20% by mass or more and 80% by mass or less, preferably 30% by mass or more and 70% by mass or less.
<33>
The absorbent article according to any one of <1> to <32>, wherein the third layer has lower liquid permeability than the second layer.

<34>
It has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and along both sides of the laminated structure along the longitudinal direction, toward the skin side of the wearer when worn. A leak-proof cuff that stands up is arranged,
The absorbent article according to any one of <1> to <33>, wherein, in the standing state of the leakage-preventing cuff, at least one of the layers constituting the laminated structure is wrinkled.
<35>
The absorbent article according to any one of <1> to <34>, wherein the antibacterial agent is an inorganic antibacterial agent or an organic antibacterial agent.
<36>
The absorbent article according to <35> above, wherein the organic antibacterial agent is one or two selected from silver-supported zeolite and titanium oxide.
<37>
The absorbent article according to <35> or <36> above, wherein the organic antibacterial agent is one or two selected from sodium dodecyl sulfate, benzalkonium chloride, and alkylpolyaminoethylglycine hydrochloride.
<38>
According to any one of <1> to <37>, there is no other layer between the first layer and the second layer, and there is no other layer between the second layer and the third layer. absorbent article.
<39>
The first layer is a surface sheet arranged close to the wearer's skin, the third layer is a liquid-retaining absorbent core, and the second layer is a core wrap sheet covering the absorbent core. The absorbent article according to any one of <1> to <38> above.

1 Disposable diaper (absorbent article)
2 Absorbent main body 20, 20A, 20B, 20C, 20D Laminated structure 21 First layer 21a First layer depression (recess)
21b First layer projection 22 Second layer 23 Third layer 23a Third layer depression (recess)
23b 3rd layer protrusion 24 Antibacterial agent 25 Intermediate sheet 3 Top sheet 4 Back sheet 5 Absorber 50 Absorbent core 51 Core wrap sheet 52 Skin side core wrap sheet 53 Non-skin side core wrap sheet 6 Flap part 7 Leakage prevention cuff 70 Sheet for forming leak-proof cuff 71 Elastic member for forming leak-proof cuff A Abdominal part B Crotch part C Back part X Vertical direction Y Horizontal direction

Claims (13)

An absorbent article having a laminated structure that absorbs and retains bodily fluid excreted by a wearer,
The laminated structure includes a first layer positioned relatively close to the wearer's skin, a third layer positioned relatively far from the wearer's skin, and the first layer and the third layer positioned relatively far from the wearer's skin. and a second layer disposed between the three layers,
Each of the first layer , the second layer , and the third layer has a depression on the skin-facing surface,
a space corresponding to the recess of the third layer exists between the second layer and the third layer;
The second layer or the third layer contains an antibacterial agent,
The recessed portion of the first layer and the recessed portion of the third layer are present in a position overlapping the antibacterial agent placement region in which the antibacterial agent is placed in plan view ,
There is a portion where the recessed portion of the first layer and the recessed portion of the second layer are integrally recessed, and the constituent fibers of the first layer in the portion are fused together, and the fibers in the portion are fused. An absorbent article in which the constituent fibers of the second layer are fused together . 2. The absorbent article according to claim 1, wherein the depth of the recess of the third layer is deeper than the depth of the recess of the first layer. 3. The absorbent article according to claim 1 or 2, wherein said first layer further contains an antibacterial agent. 4. The absorbent according to any one of claims 1 to 3, wherein the first layer has a plurality of depressions on the skin-facing surface, and a plurality of protrusions protruding toward the wearer's skin. Goods. The absorbent article according to any one of claims 1 to 4 , wherein said second layer contains an antibacterial agent. The absorbent article according to any one of claims 1 to 5 , wherein the recessed portion of the second layer has a recess depth greater than that of the recessed portion of the first layer. 7. The absorbent according to any one of claims 1 to 6 , wherein the second layer has a plurality of depressions on the skin-facing surface, and a plurality of projections protruding toward the wearer's skin. Goods. The absorbent article according to any one of claims 1 to 7 , wherein the second layer has lower liquid permeability than the first layer. The absorbent article according to any one of claims 1 to 8 , wherein said third layer contains an antibacterial agent. 10. The absorbent article according to any one of claims 1 to 9 , wherein in the third layer, the basis weight at the position where the recess is formed is lower than the basis weight at the peripheral portion of the recess. The absorbent article according to any one of claims 1 to 10 , wherein the recessed portion of the third layer is a through-hole that penetrates the third layer in the thickness direction. 12. The absorbent article according to any one of claims 1 to 11 , wherein the depth of the recessed portion of the third layer is deeper than the depth of the recessed portion of the second layer. The absorbent article according to any one of claims 1 to 12 , wherein the third layer has lower liquid permeability than the second layer.

Images