JP2015104646A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of effectively preventing stuffiness and a skin trouble by suppressing transpiration of humor such as menstrual blood during being worn.SOLUTION: An absorbent article 1 includes: a liquid-permeable surface layer 2 forming a skin-facing surface; a liquid-impermeable leakproof layer 3 forming a skin non-facing surface; and a liquid-retention liquid absorption layer 40 interposed between both layers 2 and 3. The absorbent article further includes an intermediate layer 10 containing glycerine between the surface layer 2 and the absorption layer 40, and the skin-facing surface side of the surface layer 2 has a recessed/protruding shape. Protrusions 21 constituting the recessed/protruding shape of the surface layer 2 are filled with fibers. Recesses 22 constituting the recessed/protruding shape of the surface layer 2 have high density compared with the protrusions 21 constituting the recessed/protruding shape.

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (corimono sheet), and a disposable diaper.

  In absorbent articles such as sanitary napkins, body fluids such as menstrual blood absorbed and retained in the liquid absorption layer are evaporated from the skin facing surface side by body temperature and discharged as water vapor to the wearer's skin side, The inner space of the absorbent article being worn (between the skin of the wearer and the skin-facing surface of the absorbent article) becomes stuffy, which may cause skin troubles such as itching and fogging. Accordingly, various absorbent articles have been proposed for the purpose of reducing and preventing skin troubles.

  For example, Patent Document 1 wraps a member disposed on the non-skin facing surface side of the surface layer that forms the skin facing surface of the absorbent article, for example, a transfer sheet directly below the surface layer or a liquid absorbing layer. It is described that a lotion is applied to a carrier sheet or the like, and that a polysaccharide such as glycerin is blended as a lotion component. In addition, the skin opposing surface of the surface layer in the absorbent article described in Patent Document 1 is not uneven, and is flat. According to Patent Document 1, lotion processing was applied to a surface that does not directly contact the wearer's skin, such as a surface material of an absorbent article, a gather sheet, or the like that does not directly contact the wearer's skin. Therefore, it is said that the lotion that has oozed out at the time of liquid excretion reduces the blur without the lotion sticking to the skin from the time of wearing.

  Further, Patent Document 2 discloses a lotion coating that can be transferred to a wearer's skin by normal contact, wearer's movement, body temperature, and the like on the surface of a leg cuff of an absorbent article and the like. It is also described that the lotion composition used in this lotion coating contains an emollient and a fixing agent (such as glycerin monoester) for the emollient.

JP 2004-89322 A JP 2001-314440 A

  The techniques described in Patent Documents 1 and 2 are mainly designed so that the lotion component shifts to the wearer's skin while the absorbent article is worn, and the lotion component itself reduces the itching and fogging of the skin. It is intended and is not intended primarily to suppress stuffiness while wearing absorbent articles that may cause skin problems such as itching and fogging, and in turn, transpiration of bodily fluids that cause such stuffiness. . Absorbent articles that can suppress the transpiration of menstrual blood while wearing and can effectively prevent stuffiness and skin trouble have not been provided yet.

  Therefore, the present invention relates to an absorbent article that can suppress the transpiration of body fluids such as menstrual blood while wearing and can effectively prevent stuffiness and skin troubles.

  The present invention includes a liquid-permeable surface layer that forms a skin-facing surface, a liquid-impermeable leak-proof layer that forms a non-skin-facing surface, and a liquid-retaining liquid-absorbing layer interposed between both layers. An absorbent article comprising an intermediate layer containing glycerin between the surface layer and the absorbent layer, wherein the skin-facing surface side of the surface layer has an uneven shape.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which suppresses transpiration | evaporation of bodily fluids, such as menstrual blood, and can prevent a swelling and a skin trouble effectively during wear is provided.

FIG. 1 is a plan view showing the skin facing surface side (surface layer side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention, with a part thereof broken. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. Fig.3 (a) is a perspective view which shows typically the skin opposing surface of one Embodiment of the surface sheet concerning this invention, FIG.3 (b) is a longitudinal cross-section of the surface sheet shown to Fig.3 (a) typically. FIG. FIG. 4 is a perspective view schematically showing a skin facing surface of another embodiment of the top sheet according to the present invention. FIG. 5 is a cross-sectional view schematically showing still another embodiment of the topsheet according to the present invention. 6 (a) is a perspective view schematically showing a skin facing surface of still another embodiment of the top sheet according to the present invention, and FIG. 6 (b) is a cross-sectional view taken along the line II-II in FIG. 6 (a). FIG. 6C and FIG. 6D are sectional views schematically showing a modification of the surface sheet shown in FIG. 6A (corresponding to FIG. 6B). It is.

  Hereinafter, the absorptive article of the present invention is explained based on the desirable embodiment with reference to drawings. The sanitary napkin which is one Embodiment of the absorbent article of this invention is shown by FIG.1 and FIG.2. The napkin 1 of this embodiment includes a top sheet 2 as a liquid-permeable surface layer that forms a skin facing surface, a back sheet 3 as a liquid-impermeable leak-proof layer that forms a non-skin facing surface, and both layers. An absorbent body 4 having an absorbent core 40 as a liquid-retaining liquid absorbing layer interposed between two and three is provided.

  In this specification, the skin facing surface is a surface (side relatively close to the wearer's skin) that faces the wearer's skin side in the wearing state in the napkin 1 and its constituent members (for example, the absorbent body 4). The non-skin facing surface is a surface (side relatively distant from the wearer's skin) directed to the side opposite to the wearer's skin side in the wearing state of the napkin 1 and its constituent members.

  The napkin 1 includes an absorbent main body 5 including a top sheet 2, a back sheet 3, and an absorber 4. As shown in FIG. 1, the napkin 1 (absorbent main body 5) is worn from the excretory part region A, which is an area disposed opposite to the wearer's liquid excretion part (eg, vaginal opening) when worn, from the excretion part region A It has the front area | region B distribute | arranged to a person's belly side, and the back area | region C distribute | arranged to a wearer's back side rather than this excretion part area | region A. FIG. Moreover, the napkin 1 (absorbent main body 5) has the vertical direction X equivalent to a wearer's front-back direction at the time of wear, and the horizontal direction Y orthogonal to this. The vertical direction X of the napkin 1 (absorbent main body 5) is a direction extending between the front region B and the rear region C via the excretory region A. In addition, "at the time of wearing" here means a state in which a normal proper wearing position (correct wearing position of the absorbent article) is maintained, and the absorbent article is in a state shifted from the wearing position. Is not included.

  In addition, when the excretion part opposing part A has a wing part like the napkin 1 of this embodiment, it is the same as the longitudinal direction of the absorbent article (the longitudinal direction of the absorbent main body 5; the X direction in the figure). This is a region having the wing part 7 (a region sandwiched between a base on one side in the front-rear direction of the wing part 7 and a base on the other side). The excretion part opposing part in the absorbent article which does not have a wing part is the transverse direction (width direction of an absorbent article, in the figure) generated when the absorbent article is folded into a tri-fold individual form. The two folding lines (not shown) crossing in the Y direction) are areas surrounded by the first folding curve and the second folding curve counted from the front end in the longitudinal direction of the absorbent article.

  Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorbent body 4 and extends outward from the periphery of the absorbent body 4, and an adhesive, heat seal, and ultrasonic seal are formed at these extended portions. The peripheral seal portion 6 is formed by being joined to each other by a known joining means such as the above. The absorber 4 extends from the front region B to the rear region C, and has a substantially rectangular shape with rounded corners that are long in the vertical direction X in plan view. The top sheet 2, the back sheet 3, and the absorbent body 4 may be joined by an adhesive.

  As shown in FIG. 2, the absorbent body 4 includes an absorbent core 40 that can absorb and hold liquid and a liquid-permeable core wrap sheet 41 that covers the absorbent core 40. The core wrap sheet 41 is a single continuous sheet that covers the entire area of the skin facing surface of the absorbent core 40 (the surface facing the top sheet 2), and both sides along the longitudinal direction X of the absorbent core 40. The outer portion extends outward in the lateral direction Y from the edge, and these extended portions are rolled down below the absorbent core 40 to face the non-skin facing surface of the absorbent core 40 (the facing surface to the back sheet 3). The whole area is covered. The absorbent core 40 and the core wrap sheet 41 may be joined by a known joining means such as an adhesive.

  The top sheet 2 and the back sheet 3 extend from the respective side edges along the longitudinal direction X of the absorbent body 4 outward in the lateral direction Y to form side flap portions, and the side flap portions are formed in the excretory region A. A large bulge extends outward in the lateral direction Y, thereby extending a pair of wing portions 7 and 7 on both left and right sides of the absorbent main body 5 along the longitudinal direction X. The top sheet 2 and the back sheet 3 are joined to each other by a known joining means such as an adhesive in the wing part 7 (the side flap part). When the napkin 1 is fixed to a crotch portion of clothing such as shorts, the wing portion 7 is used by being folded back to the non-skin facing surface side of the clothing.

  On the non-skin facing surface of the absorbent main body 5 (non-skin facing surface of the back sheet 3), as shown in FIG. 2, a main body adhesive portion 8 for fixing the napkin 1 to clothing such as shorts is provided. Moreover, the wing part adhesion part 9 which fixes this wing part 7 to clothes, such as shorts, is provided in the non-skin opposing surface (non-skin opposing surface of the back surface sheet 3) of the wing part 7. FIG. Both adhesive parts 8 and 9 are covered with a release sheet (not shown) when not in use.

  One of the main features of the napkin 1 of the present embodiment is that an intermediate layer containing glycerin (also referred to as a second layer or a sublayer) is provided between the surface layer and the absorbing layer. . More specifically, as shown in FIGS. 1 and 2, an intermediate sheet 10 containing glycerin is interposed as the intermediate layer between the top sheet 2 and the absorbent body 4 (core wrap sheet 41). . The intermediate sheet 10 has a rectangular shape in a plan view as shown in FIG. 1 and is arranged in the excretory part region A (between the pair of wing parts 7, 7) with its longitudinal direction coinciding with the vertical direction X. . The length (width) in the lateral direction Y of the intermediate sheet 10 is the same as or shorter than that of the absorber 4. The intermediate sheet 10 and the top sheet 2 and the absorbent body 4 (core wrap sheet 41) are joined together entirely or partially by a known joining means such as an adhesive.

  Thus, by arranging the intermediate sheet 10 containing glycerin so as to contact the surface sheet 2 on the non-skin facing surface side of the surface sheet 2, body fluids excreted from the wearer, such as menstrual blood, urine, The intermediate sheet 10 is mixed with glycerin, thereby suppressing the transpiration of the body fluid to the skin side. As a result, the stuffiness during wearing of the napkin 1 is suppressed, and the skin trouble (itching, fogging caused by the stuffiness) is suppressed. Etc.) is prevented. In addition to containing glycerin, an intermediate layer is interposed between the surface layer and the absorption layer, so that the body fluid excreted in the surface layer is quickly absorbed by the absorption layer side. In addition, so-called liquid return in which the body fluid absorbed in the absorption layer returns to the top sheet is suppressed.

  The intermediate sheet 10 (the glycerin-containing portion in the intermediate sheet 10) may cover the entire skin facing surface (surface on the surface sheet 2 side) of the absorbent body 4, or may cover only a part thereof. In the latter case, it is preferable that the intermediate sheet 10 is arranged in the excretion area A as in the present embodiment. Further, for example, when the absorbent article of the present invention is a napkin or panty liner having a total length in the longitudinal direction X of less than 30 cm, such as for daytime or less daily use, the intermediate sheet 10 is at least the absorbent article (absorbent body). Is preferably arranged so as to straddle the vertical direction X along a vertical center line (not shown) that bisects the vertical direction X.

The intermediate sheet 10 includes glycerin and a liquid-permeable fiber sheet that holds the glycerin. The intermediate sheet 10 can be manufactured by applying and spraying glycerin to a fiber sheet. The fiber sheet constituting the intermediate sheet 10 is a single-layered sheet made of paper, nonwoven fabric, or the like that is separate from the top sheet 2 and the absorbent body 4 (core wrap sheet 41). Examples of the fiber sheet constituting the intermediate sheet 10 include paper obtained by wet papermaking; nonwoven fabric produced by the card method, air-through nonwoven fabric, resin bond nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric, and needle punch nonwoven fabric. Various non-woven fabrics such as can be used. These nonwoven fabrics may be subjected to a hydrophilic treatment using a hydrophilic agent such as a surfactant. The basis weight of the fiber sheet constituting the intermediate sheet 10 is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 50 g / m ² or less, more preferably 45 g / m ² or less. Specifically, it is preferably 10 to 50 g / m ² , more preferably 15 to 45 g / m ² . When the amount is within this range, a sufficient amount of glycerin can be retained, and it is easy to maintain a good wearing feeling.

  The content of glycerin in the intermediate sheet 10 is preferably 60% by mass or more, more preferably 100% by mass or more, and preferably 300% by mass or less, more preferably 250% by mass with respect to the total mass of the intermediate sheet 10. Hereinafter, more specifically, it is preferably 60 to 300% by mass, and more preferably 100 to 250% by mass. When the content of glycerin is not less than the lower limit (60% by mass), even when the amount of excretion is large or worn for a long time, the effect of suppressing transpiration of body fluid is high, and the effect of suppressing stuffiness is easily obtained. On the other hand, if the glycerin content is not more than the upper limit (300% by mass), the liquid permeability is kept good from the initial absorption, and the liquid does not easily accumulate on the napkin surface. There is an advantage that it is easy to obtain the effect.

Further, the content of glycerol with respect to 1 g of the absorbent capacity of the absorbent article (napkin 1) is preferably 0.5% or more, more preferably 1% or more, still more preferably 2% or more, and preferably 10%. Or less, more preferably 8% or less, still more preferably 6% or less, more specifically preferably 0.5% or more and 10% or less, more preferably 1% or more and 8% or less, and further preferably 2%. It is 6% or less. Within this range, even when the amount of excretion is large, it is easy to obtain a high stuffiness suppressing effect, and even when worn for a long time, there is little discomfort such as stickiness, and a good wearing feeling is likely to be obtained.
The absorption capacity of the absorbent article is measured as follows.

[Measurement method of absorption capacity]
The absorption capacity of the absorbent body in the absorbent article to be measured is measured in accordance with JIS K 7223-1996, which is a water absorption test method for highly water-absorbent resins. The absorbent body is taken out from the absorbent article (napkin 1) and immersed in a physiological saline (0.9 mass% sodium chloride water) adjusted to 25 ° C. so that the whole is immersed. Ten minutes after the start of immersion, the absorbent is taken out from the physiological saline and dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., model 130c special model). The dehydrating condition is 800 rpm × 5 minutes. After dehydration, the mass of the sample is measured, a centrifugal retention amount (unit: g / g) is calculated according to the following formula, and the calculated value is taken as the absorption capacity of the absorbent article. In the following formula, each mass is in g.
Centrifugal retention amount = (mass of absorber after centrifugal dehydration-mass of absorber before water absorption) / mass of absorber before water absorption Measurement was performed 5 times, excluding the value of one point each on the top and bottom, and the remaining three points The average value was taken as the measured value. The measurement is carried out at 23 ± 2 ° C. and humidity 50 ± 5%, and before the measurement, the sample absorber is stored for 24 hours or more in the same environment as the measurement.

  Moreover, as one of the main characteristics of the napkin 1 of this embodiment, in addition to having the intermediate sheet 10 (intermediate layer) containing glycerin, as shown in FIG. The point which the skin opposing surface side has comprised uneven | corrugated shape is mentioned. The skin and surface of the wearer of the napkin 1 are compared with the case where the skin-facing surface side of the topsheet 2 is a flat surface that does not have a concavo-convex shape because the skin-facing surface side of the topsheet 2 has a concavo-convex shape Since the contact area with the sheet 2 is reduced, the transition of the glycerin contained in the adjacent intermediate sheet 10 or the body fluid once absorbed by the absorbent body 4 to the skin side of the wearer is effectively suppressed. As a result, the above-described effects of glycerin (suppression of transpiration of body fluids such as menstrual blood and urine) can be achieved more stably, and the dry feeling of the skin facing surface of the topsheet 2 can be improved.

  Moreover, as another effect by the skin opposing surface side of the surface sheet 2 having an uneven shape, an effect of suppressing transpiration of body fluid to the skin side by the surface sheet 2 itself can be given. Therefore, according to the napkin 1 of the present embodiment, the intermediate sheet 10 containing glycerin is provided between the top sheet 2 and the absorbent body 4, and the skin facing surface side of the top sheet 2 has an uneven shape. As a result, the transpiration of body fluids is effectively suppressed, and as a result, stuffiness while wearing the napkin 1 is effectively suppressed, and skin troubles (itching, fogging, etc.) caused by stuffiness are effective. Is prevented.

  As shown in FIG. 2, the skin-facing surface side of the topsheet 2 has a concavo-convex shape having a large number of convex portions 21 and concave portions 22. The recessed part 22 consists of embossed parts formed by embossing such as hot embossing and ultrasonic embossing. In the recessed part 22, the constituent fibers of the topsheet 2 are bonded by heat and / or pressure. The convex portion 21 is located between the concave portions 22 and 22. On the other hand, the non-skin facing surface side (facing surface side with respect to the intermediate sheet 10) of the top sheet 2 is a flat surface that is not substantially uneven.

  In the present embodiment, the convex portion 21 is filled with fibers, that is, the convex portion 21 is solid. Thus, when the convex part 21 which comprises the uneven | corrugated shape of the surface sheet 2 is satisfy | filled with the constituent fiber of this surface sheet 2, the surface sheet 2B (refer FIG. 4) or 2C (refer FIG. 5) mentioned later is mentioned. Thus, compared with the case where the convex part 21 is hollow, the transpiration suppression effect to the skin side of the bodily fluid by the surface sheet 2 itself mentioned above is more reliably show | played.

  Moreover, in this embodiment, the recessed part 22 consists of the embossed part formed by embossing as mentioned above, and, as a result, compared with the convex part 21 which is not embossed, it is high density. is there. That is, the concave portion 22 is consolidated, and has a smaller thickness and a higher density than the other portion (the convex portion 21) in the topsheet 2. Therefore, the concave portion 22 is a convex portion in the topsheet 2. It has a fiber density structure due to the fiber density being higher than 21. Thus, when the concave portions 22 constituting the concave-convex shape on the skin facing surface side of the topsheet 2 have a relatively high density, the effect of reducing stuffiness can be achieved by suppressing evaporation of the liquid to the skin side.

As the surface sheet 2 (surface layer), a liquid-permeable surface sheet conventionally used in this type of absorbent article can be used. For example, a nonwoven fabric produced by a card method, an air-through nonwoven fabric, a spunbond nonwoven fabric. And various non-woven fabrics such as melt blown non-woven fabric, spun lace non-woven fabric and needle punched non-woven fabric; and films made liquid-permeable by opening means. These nonwoven fabrics and films may be subjected to a hydrophilic treatment using a hydrophilic agent such as a surfactant. The basis weight of the surface sheet 2 is preferably 20 g / m ² or more, more preferably 35 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, and more specifically, Preferably it is 20-100 g / m < ² >, More preferably, it is 35-80 g / m < ² >. A specific example of the top sheet 2 will be described later.

Moreover, it is preferable that the back surface sheet 3 (leak-proof layer) has moisture permeability. Since the back sheet 3 has moisture permeability, moisture accumulated inside the napkin 1 being worn is discharged to the outside of the napkin 1 through the moisture permeable back sheet 3. In addition, combined with the effect of suppressing the transpiration of body fluids by the combination of the intermediate sheet 10 and the top sheet 2, further reduction of stuffiness can be achieved. Here, the “moisture permeability” is a property of diffusing water vapor from the high humidity side to the low humidity side according to the second law of thermodynamics without airflow movement as in the concept disclosed in JIS Z0208 or ASTM E398. It is a property expressed in a porous film having extremely small pores and a non-porous film highly compatible with water. As the back sheet 3 having moisture permeability, for example, a moisture-permeable film alone, a laminate of a moisture-permeable film and a nonwoven fabric, a water-repellent nonwoven fabric, or the like can be used. From the viewpoint of quickly removing moisture accumulated in the napkin 1 (in-wearing humidity), the back sheet 3 preferably has air permeability in addition to moisture permeability. Here, “breathability” is literally a property of breathing and is typically a property of airflow passing through like various fabrics. The basis weight of the backsheet 3 is preferably 18 g / m ² or more, more preferably 35 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, and more specifically, Preferably it is 18-100 g / m < ² >, More preferably, it is 35-80 g / m < ² >.

  Further, the absorbent core 40 (liquid absorbing layer) constituting the absorbent body 4 can be used without particular limitation as long as it is normally used for this type of absorbent article. For example, wood pulp, hydrophilization treatment It is possible to use a fiber aggregate such as a synthetic fiber or a fiber aggregate in which a particulate water-absorbing polymer is held. Moreover, as a core wrap sheet which coat | covers the absorptive core 40, a liquid-permeable thin paper, various nonwoven fabrics, an apertured film, etc. can be used, for example.

  Further, as the absorbent body 4 (absorbent core 40), from the viewpoint of thinning and low rigidity of the napkin 1, not the fiber assembly (stacked body formed by stacking fiber materials) but the fibers. It is also possible to use an absorbent sheet having a small thickness and a low rigidity as compared with the aggregate. This absorbent sheet is made by bonding between constituent fibers or between constituent fibers and the water-absorbing polymer through adhesive force generated in the water-absorbing polymer in a wet state or a binder such as an adhesive or adhesive fiber added separately. A sheet or the like can be preferably used. As a preferable form of the absorbent sheet, a pulp fiber aggregate is fixed with a water-absorbing polymer, a dry pulp sheet produced by an airlaid method, and a particulate water-absorbing polymer dispersed between two nonwoven fabrics. Can be mentioned. The absorbent sheet (absorbent core 40) constituting the absorbent body 4 (absorbent core 40) may be one sheet or plural sheets, and the absorbent sheet can be folded and used. For example, a sheet of rectangular absorbent sheet having a rectangular shape in the lateral direction Y longer than the napkin 1 is used, and both side portions along the longitudinal direction X are folded back to the non-skin facing surface side of the absorbent sheet. A folded absorbent sheet having a laminated structure of two absorbent sheets formed by the folding can be used as the absorbent body 4. The thickness per sheet of the absorbent sheet is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, more preferably 1.5 mm or less, more specifically, preferably It is 0.1 mm or more and 2 mm or less, More preferably, it is 0.3 mm or more and 1.5 mm or less.

  The embodiment of the surface sheet which concerns on this invention is shown by FIGS. Regarding the embodiment of the surface sheet to be described later, constituent parts different from those of the above-described embodiment (surface sheet 2) will be mainly described, and the same constituent parts will be denoted by the same reference numerals and description thereof will be omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described.

  The topsheet 2A (surface layer) shown in FIG. 3 has a first fiber layer 23A located on the side close to the wearer's skin and a second fiber layer 24A located on the side far from the wearer's skin, Both the fiber layers 23A and 24A are integrated in the thickness direction by a large number of partially formed joints (recesses 22), and a plurality of the joints (recesses 22) in the first fiber layer 23A. A portion located between the two protrudes in a convex shape to form a convex-shaped convex portion 21 on the skin facing surface side.

  The convex portion 21 is formed by the constituent fibers of the first fiber layer 23A and the constituent fibers of the second fiber layer 24A. The convex portion 21 is surrounded by a plurality of concave portions 22 (joint portions). From the viewpoint of making the protrusion 21 more prominent, the protrusion 21 is preferably surrounded by three or more recesses 22. In this case, it is preferable that the convex portion 21 has a top portion at a substantially central portion of a region surrounded by the plurality of concave portions 22.

  When the topsheet 2A is viewed from the first fiber layer 23A side (skin facing surface side) by visual observation, a large number of the recesses 22 (joints) are regularly scattered throughout the topsheet 2A. And are distributed almost uniformly. When the plurality of recesses 22 are arranged to form one row and the rows are arranged in multiple rows, the recesses 22 in one row are the recesses 22 included in the row adjacent to the row. The recesses 22 may be arranged in a staggered pattern as a whole, or the recesses 22 in each row may be arranged with their vertical and horizontal positions aligned.

  The planar view shape of the concave portion 22 is not particularly limited, and one type such as a circle, a triangle, a rectangle, a polygon such as a hexagon, an ellipse, a cross, or the like can be used alone or in combination of two or more. The recess 22 is formed by laminating a web or nonwoven fabric that is the original fabric of the first fiber layer 23A and a web or nonwoven fabric that is the original fabric of the second fiber layer 24A, and embossing with or without heat in the laminate. It is formed by embossing such as processing or ultrasonic embossing. The recess 22 can be formed by joining the fiber layers 23A and 24A via an adhesive instead of embossing.

  When the concave portion 22 is formed to have a higher density than the convex portion 21 in the topsheet 2A, the excreted body fluid passes through the concave portion 22 and the intermediate sheet 10 positioned on the lower side (non-skin facing surface side) of the topsheet 2A. Therefore, it becomes easy to be drawn into the absorber 4. On the other hand, the glycerin arranged in the intermediate sheet 10 is difficult to move from the concave portion 22 separated from the wearer's skin to the skin, whereby when body fluid reaches the concave portion 22, Since diffusion in the plane direction of the intermediate sheet 10 and movement in the thickness direction toward the absorber 4 occur, transpiration from body fluid is easily suppressed. Further, the relatively low density convex portions 21 effectively act to keep the body fluid away from the skin. From these viewpoints, the ratio of the area of the concave portion 22 to the total area of the topsheet 2 is preferably 0.1 or more and 0.5 or less, and more preferably 0.2 or more and 0.4 or less. From the same viewpoint, the difference in height between the convex portion 21 and the concave portion 22, that is, the distance from the bottom of the concave portion 22 to the top portion of the convex portion 21 is preferably 0.3 mm or more, particularly 0.5 mm or more. Also, from the viewpoint of making it difficult to feel uncomfortable when worn, it is preferably 5 mm or less, and particularly preferably 3 mm or less.

  Since the basis weight of the top sheet 2A is equal to or more than the basis weight of the intermediate sheet 10, the glycerin of the intermediate sheet 10 becomes more difficult to transfer to the skin, which is effective in suppressing stuffiness when the napkin 1 is worn for a long time. preferable. In addition, the density of the intermediate sheet 10 is preferably equal to or higher than the density of the top sheet 2 </ b> A from the viewpoint of holding glycerin in the intermediate sheet 10. However, in the case where the concave portions 22 of the topsheet 2A are densified (higher density than the convex portions 21), the density in other portions of the topsheet 2A excluding the concave portions 22 is low. It only has to be like that.

  The first fiber layer 23A contains heat-fusible fibers. This fiber is a two-component composite fiber composed of a first resin component made of a high melting point resin and a second resin component made of a low melting point resin having a melting point or softening point lower than the melting point of the first resin component. As this composite fiber, for example, a core-sheath type (including both a concentric core-sheath type and an eccentric core-sheath type) or a side-by-side type can be used. The heat-fusibility of the composite fiber is mainly expressed by the second resin component. Therefore, when the conjugate fiber is, for example, a core-sheath type, the second resin component is a component constituting the sheath.

  The heat-fusible fiber contained in the first fiber layer 23A is preferably made of a heat-extensible fiber that has been stretched by heat treatment, that is, a heat-stretchable fiber that has been stretched. Further, the first fiber layer 23A may be composed only of heat-fusible fibers, or may contain fibers that do not have heat-fusible properties in addition to this. The first fiber layer 23A preferably does not contain heat-shrinkable fibers (that is, heat-shrinkable fibers after shrinkage) including the crimped latent crimpable fibers contained in the second fiber layer 24A.

  The convex portion 21 is mainly configured with the constituent fibers of the first fiber layer 23A on the skin facing surface side (upper side), and mainly configured with the constituent fibers of the second fiber layer 24A on the non-skin facing surface side (lower side). Has been. Then, as shown in FIG. 3B, the second fiber layer 24 </ b> A is directed toward the first fiber layer 23 </ b> A in a longitudinal sectional view in a plane including the top of the convex portion 21 and the concave portion 22 (joint portion). It protrudes and enters the first fiber layer 23A. In addition, in the same cross-sectional view, the non-skin facing surface side (lower side) surface of the first fiber layer 23A and the skin facing surface side (upper side) surface of the second fiber layer 24A are in close contact. Furthermore, the inside of the convex portion 21 is filled with the constituent fibers of both the fiber layers 23A and 24A. Since the convex portion 21 has such a structure, when bodily fluid such as menstrual blood is excreted on the skin facing surface side of the topsheet 2A, the bodily fluid can quickly permeate the inside of the convex portion 21. it can. This is because the constituent fibers of the second fiber layer 24A are raised toward the first fiber layer 23A to push up the constituent fibers of the first fiber layer 23A. This is because adhesion with the fiber layer 24A is improved. Further, the convex portion 21 having such a structure is also effective in preventing the liquid once absorbed by the absorber from returning.

  The convex portion 21 is configured such that the heat-fusible fiber contained therein draws a convex smooth curve on a substantially arch shape. This smooth curve is formed by elongating a heat-extensible fiber that is a raw material of the heat-fusible fiber so as to draw a convex curve upward by heat treatment. By this elongation, the constituent fibers of the second fiber layer 24A enter the first fiber layer 23A.

The basis weight of the first fiber layer 23A and the second fiber layer 24A is a value such that the fiber density of each layer satisfies the relationship of the first fiber layer 23A <the second fiber layer 24A in relation to the thickness of the layers. It is preferable. Specifically, the basis weight of the first fiber layer 23A is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 50 g / m ² or less, more preferably 40 g / m ² or less. and more specifically, preferably 10 to 50 g / m ^2, especially 20 to 40 g / m ^2. The basis weight of the second fiber layer 24A is preferably 20 g / m ² or more, more preferably 30 g / m ² or more, and preferably 60 g / m ² or less, more preferably 50 g / m ² or less, more specifically Is preferably 20 to 60 g / m ² , particularly 30 to 50 g / m ² .

  The configuration of the surface sheet 2A described above is summarized as follows. That is, the first fiber layer 23A is provided on the skin facing surface side, the second fiber layer 24A adjacent thereto is provided on the non-skin facing surface side, and the first fiber layer 23A is a core-sheath type heat-sealing. The heat-fusible conjugate fiber is made of a heat-extensible fiber that has been elongated by heat treatment, and the second fiber layer 24A is made of a fiber layer that contains a crimpable fiber. The fiber layer 23A and the second fiber layer 24A are joined by a large number of joints (concave portions 22), and are convexly protruded on the skin facing surface side of the first fiber layer 23A surrounded by the many joints. A large number of portions 21 are formed on the skin facing surface side on the first fiber layer 23A side. In the convex portion 21, the second fiber layer 24A is directed toward the skin facing surface side of the first fiber layer 23A. It protrudes into the first fiber layer 23A, and the second fiber Non-skin facing side of the face of 24A is flat.

  2 A of surface sheets can be manufactured according to the following processes 1-4. In the following steps, the “upper layer” corresponds to the first fiber layer 23A or a precursor thereof, and the “lower layer” corresponds to the second fiber layer 24A or a precursor thereof. The topsheet 2A can be manufactured, for example, according to the manufacturing method described in JP2012-5701A.

Step 1: A web is formed by a card method using a heat-extensible core-sheath fiber as a raw material.
Step 2: The web is subjected to an air-through hot air treatment to thermally bond the intersection of the heat-extensible core-sheath fibers, and the heat-extensible core-sheath fibers are not heat-extended or heated again. An upper-layer nonwoven fabric is formed by stretching the heat-extensible core-sheath fiber while leaving room for elongation.
-Step 3: Separately from the formation of the upper layer nonwoven fabric, a lower layer web is formed by a card method using latent crimpable fibers as a raw material, the upper layer nonwoven fabric and the lower layer web are overlapped, and a plurality of both are bonded. The laminated web is obtained by joining the parts.
Step 4: The laminated web is subjected to an air-through hot air treatment to crimp the latent crimpable fibers contained in the lower layer web, and the thermally extensible core-sheath fibers in the upper layer nonwoven fabric. Heat stretch.

  In the surface sheet 2B (surface layer) shown in FIG. 4, the convex part 21 which comprises the uneven | corrugated shape by the side of a skin opposing surface is hollow. More specifically, the topsheet 2B is made of a nonwoven fabric having a single-layer structure, and protrudes toward the wearer's skin side at portions other than the recesses 22 to form the protrusions 21. The convex portions 21 and the concave portions 22 constituting the concavo-convex shape are arranged alternately and in a row in one direction. A space 25 in which the constituent fibers of the topsheet 2B are not substantially present is formed in the convex portion 21. The recess 22 has a flat shape with substantially no unevenness. The top sheet 2B can be formed by using a known embossing process. For example, a top sheet original fabric (a flat sheet having no unevenness), a first roll having an uneven surface and the first roll It is obtained by engaging the concave and convex shape which is meshed with the concave and convex shape of the first roll into the meshing portion with the second roll having the peripheral surface and shaping the surface sheet raw material with the concave and convex shapes. .

  Thus, when the convex part 21 which comprises the uneven | corrugated shape of the surface sheet 2B is hollow, the convex part 21 is solid like the surface sheet 2 (refer FIG. 2) and 2A (refer FIG. 3) mentioned above. Compared to the case, since the transition to the wearer's skin side of glycerin contained in the intermediate sheet 10 located adjacent to the non-skin facing surface side of the topsheet 2B is effectively suppressed, The above-described effects of glycerin (suppression of transpiration of body fluids such as menstrual blood and urine) can be achieved more stably, and the dry feeling of the skin facing surface of the topsheet 2 is improved.

  The top sheet 2C (surface layer) shown in FIG. 5 has two layers having a first fiber layer 23C located on the side close to the wearer's skin and a second fiber layer 24C located on the side far from the wearer's skin. The non-woven fabric has a structure in which both fiber layers 23C and 24C are integrated in the thickness direction by a number of partially formed joints (concave portions 22), and a plurality of the joints in the first fiber layer 23C The part located between the parts (concave part 22) protrudes in a convex shape to form the convex part 21 having an uneven shape on the skin facing surface side. The first fiber layer 23C and the second fiber layer 24C may have different compositions or the same composition.

  23 C of 1st fiber layers are comprised similarly to the said surface sheet 2B (refer FIG. 4), and the uneven | corrugated shape by the convex part 21 and the recessed part 22 on the surface (surface which forms the skin opposing surface of the surface sheet 2C) In contrast, the second fiber layer 24C does not have such a concavo-convex shape and has a substantially flat shape with no concavo-convex shape. Therefore, the non-skin facing surface of the topsheet 2C ( The surface facing the intermediate sheet 10 is a flat surface having no irregularities. The first fiber layer 23C and the second fiber layer 24C are partially bonded to each other by a known bonding means such as fusion or adhesive in each of the plurality of recesses 22, and each recess 22 is formed of the first fiber layer. 23C and the second fiber layer 24C are joined portions. The first fiber layer 23 </ b> C protrudes toward the wearer's skin side at a portion other than the concave portion 22 (joint portion) to form a hollow convex portion 21, and a space 25 is formed in the convex portion 21. Yes. The basis weight of both the fiber layers 23C and 24C constituting the top sheet 2C can be set to be the same as the basis weight of the top sheet 2B.

  The surface sheet 2D (surface layer) shown in FIG. 6 is made of a nonwoven fabric having a single-layer structure, and as shown in FIG. 6 (a), the flange 26 (convex) extending in one direction (the longitudinal direction X of the napkin 1). Part) and a groove part 27 (concave part), and the flange part 26 and the groove part 27 constitute an uneven shape on the skin facing surface side of the topsheet 2D. The flange portions 26 and the groove portions 27 are alternately arranged in the lateral direction Y orthogonal to the longitudinal direction X, which is the extending direction thereof. The flange portion 26 is configured from a portion having a relatively large thickness in the topsheet 2D, and the groove portion 36 is formed from a portion having a relatively small thickness in the topsheet 2D. As a result, the substantial thickness of the flange portion 26 is larger than the thickness of the groove portion 27. Here, the substantial thickness means not the length (apparent thickness) from the back surface of the top sheet 2D to the top of each but the length of the portion where the constituent fibers of the top sheet 2D are present.

  As shown in FIG.6 (b), the collar part 26 and the groove part 27 are each filled with the constituent fiber of 2D of surface sheets, and are solid. However, the flange portion 26 and the groove portion 27 have different fiber amounts, and the flange portion 26 has a substantially larger fiber amount than the groove portion 27. As shown in FIG. 6B, the heel portion 26 has a skin facing surface side (upper surface side in the drawing) on the upper side (wearing) in a cross section along the direction (lateral direction Y of the napkin 1) orthogonal to the extending direction. A contour that draws a convex and smooth curve on the skin side of the person, and the non-skin facing surface side (the lower surface side in the figure) is a convex and smooth curve that is convex on the lower side (the intermediate sheet 10 side) The outline is drawn. The skin facing surface side of the heel part 26 is raised higher than the non-skin facing surface side, and this continues periodically. Thereby, the skin facing surface side of the topsheet 2D has a waveform shape along the lateral direction Y. Therefore, when the skin facing surface side of the topsheet 2D is in contact with the wearer's skin, the top portion of the heel portion 26 and the region in the vicinity thereof are in partial contact, , Irritation caused by rubbing is reduced. Moreover, it becomes difficult for the liquid excreted from the wearer to adhere to the wearer's skin.

  The cross-sectional shape of the collar portion 26 is not limited to the shape as shown in FIG. 6B. For example, as shown in FIG. 6C, the non-skin facing surface side is smooth and convex toward the skin facing surface side. There is a shape having a contour that draws a gentle curve, or a shape in which the non-skin facing surface side is flat as shown in FIG.

The basis weight of the ridge portion 26 (convex portion) is preferably from 30 g / m ² or more, more preferably 40 g / m ² or more, and preferably 150 g / m ² or less, more preferably 100 g / m ² or less, more specifically Specifically, it is preferably 30 to 150 g / m ² , more preferably 40 to 100 g / m ² .
The basis weight of the groove 27 (recess) is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 70 g / m ² or less, more preferably 50 g / m ² or less, more specifically Is preferably 10 to 70 g / m ² , more preferably 15 to 50 g / m ² .

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the embodiment described above, the intermediate sheet 10 and the core wrap sheet 41 are arranged as a plurality (two sheets) of sheet-like members between the top sheet 2 (surface layer) and the absorbent core 40 (absorbent layer). Of these, only the intermediate sheet 10 contains glycerin, but only the core wrap sheet 41 may contain glycerin, that is, a plurality of sheet-like members arranged between the surface layer and the absorbent layer. Only one of them may contain glycerin, or both sheets 10 and 41 may contain glycerin, i.e., a plurality of sheets arranged between the surface layer and the absorbent layer. All of the members may contain glycerin. Moreover, in the said embodiment, although the core wrap sheet | seat 41 was one continuous sheet | seat, the 1st core wrap sheet | seat which coat | covers the skin opposing surface of the absorptive core 40, and the non-absorbent core 40 non-layered You may be comprised including 2 sheets with the 2nd core wrap sheet | seat which coat | covers a skin opposing surface, In this case, you may make this 1st core wrap sheet | seat contain glycerin.

  Moreover, in the said embodiment, the groove | channel in which the surface sheet 2 and the absorber 4 are dented integrally in the skin opposing surface (skin opposing surface of the surface sheet 2) of the absorptive main body 5 toward the back surface sheet 3 side. The groove may have a closed annular shape that is long in the longitudinal direction X in a plan view as shown in FIG. This groove can be formed in accordance with a conventional method by pressing with or without heat, or by embossing such as ultrasonic embossing. In this groove, the topsheet 2 and the absorbent body 4 are formed by heat fusion or the like. It is integrated. Moreover, in the said embodiment, on the both sides along the vertical direction X in the skin opposing surface of the absorbent main body 5, so as to overlap the left and right both sides along the vertical direction X of the absorbent body 4 in a plan view as shown in FIG. A pair of side sheets made of a water-repellent nonwoven fabric or the like may be disposed over substantially the entire length in the longitudinal direction X of the absorbent main body 5.

  In addition to sanitary napkins, the absorbent article of the present invention includes panty liners (orimono sheets), incontinence pads, disposable diapers and the like. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
A sanitary napkin having the same basic configuration as the napkin 1 shown in FIGS. 1 and 2 was produced.
As the surface layer, a surface sheet having the same basic structure as that of the surface sheet 2A (see FIG. 3) produced as described below was used.
As the leak-proof layer, a back sheet made of a moisture-permeable polyethylene film having a basis weight of 37 g / m ² was used.
As a liquid absorbing layer which constitutes the absorbent body, a basis weight of 200 g / m ² of pulp fibers water-absorbing polymer in the stacks of (AQUALIC W4: manufactured by Nippon Shokubai Co., Ltd.) absorption by basis weight 40 g / m ² hold An absorbent core was used in which the entire surface of the absorbent core was covered with a core wrap sheet made of absorbent paper having a basis weight of 16 g / m ² . The size of the absorber was 200 mm in the longitudinal direction (longitudinal direction) and 75 mm in the width direction (lateral direction).
Glycerin was sprayed on the entire surface of one side of the fiber sheet produced by the method described later to obtain an intermediate sheet. The content of glycerin in the obtained intermediate sheet was 120% by mass (application amount 0.6 g) with respect to the total mass of the intermediate sheet. The content of glycerin was 3.2% with respect to the absorption capacity of the absorber.
The top sheet and the intermediate sheet were partially joined to each other with a SESB-based hot melt adhesive applied intermittently between the two sheets. The amount of hot melt adhesive applied was 5 g / m ² .

<Preparation of the surface sheet used in Example 1>
(1) Production of upper layer web and upper layer non-woven fabric As heat-extensible fibers, heat-fusible core-sheath type composite fibers having a core component of polypropylene (PP) and a sheath component of polyethylene (PE) (fineness of 2.9 dtex before stretching) A fiber length of 51 mm before stretching, a thermal stretching start temperature of 60 ° C., and a thermal stretching rate of 10% at 130 ° C. were used as raw materials. Using this fiber, a card web (upper layer web) having a basis weight of 22 g / m ² was produced by a card method. Hot air of 138 ° C. ± 5 ° C. was passed through the card web for 10 seconds by an air-through method to heat-bond the intersections between the fibers and cause the fibers to stretch. The fiber elongation was terminated before the fiber was fully extended. In this way, an upper layer nonwoven fabric was obtained.

(2) Production of lower layer web Latent spiral crimped fiber (development name: CPP fiber (core: polypropylene resin / sheath: polypropylene resin) manufactured by Daiwa Boseki Co., Ltd., fineness before crimping of 2.2 dtex, before crimping The fiber length of 51 mm and heat shrinkage starting temperature 115 ° C. was used as a raw material. Using this fiber, a card web (underlayer web) of 22 g / m ² was produced by the card method.

(3) Embossing The upper nonwoven fabric and the lower layer web were overlapped, and both were partially joined by an ultrasonic embossing method to obtain a laminated web. The joined portion formed by joining had a cross shape with an area of 3.07 mm ² , and the embossed area ratio (embossed area ratio in the finished surface sheet) was 12.5%.

(4) Heat treatment The laminated web was placed in a constant temperature dryer and heat treated at 125 ° C. ± 5 ° C. for 1 minute. As a result, the heat stretchable fibers in the upper layer nonwoven fabric were stretched and the latent crimpable fibers in the lower layer web were shrunk. As a result, a target surface sheet was obtained. The basis weight of the surface sheet was 25 g / m ² .

<Preparation of fiber sheet used in Example 1 (the same sheet as the intermediate sheet except that it does not contain glycerin)>
A synthetic fiber made of a polyethylene / polyethylene terephthalate composite resin having a fiber diameter of 2.2 dtex is passed through a card machine to form a web. The web is introduced into a hot air blowing device, subjected to hot air treatment by air-through processing, and then roll embossed. A fiber sheet was obtained. The obtained fiber sheet had a thickness of 0.2 mm and a basis weight of 25 g / m ² .

[Comparative Example 1]
A sanitary napkin was produced in the same manner as in Example 1 except that the fiber sheet was used as it was as an intermediate sheet without containing glycerin.

[Comparative Example 2]
As a flat surface sheet in which neither the skin facing surface side nor the non-skin facing surface side has an uneven shape, the fiber sheet used in Example 1 (the same sheet as the intermediate sheet except that it does not contain glycerin) A sanitary napkin was prepared in the same manner as in Example 1 except that (1) was used.

[Comparative Example 3]
The intermediate sheet does not contain glycerin (using the fiber sheet used in Example 1 as an intermediate sheet), and is the same as Example 1 except that the same amount of glycerin as in Example 1 is contained in the top sheet instead. Thus, a sanitary napkin was produced.

[Reference Example 1]
A sanitary napkin was prepared in the same manner as in Example 1 except that 0.6 g of an intermediate sheet contained guar gum, which is a kind of polysaccharide, instead of glycerin.

[Evaluation]
About the sanitary napkin of an Example, a comparative example, and a reference example, the liquid transpiration amount was measured with the following method. The results are shown in Table 1 below.

<Measurement method of liquid transpiration>
The sanitary napkin to be measured is spread in a flat shape, and the outer surface (skin An elliptical injection port having a cross-sectional area of 9 cm ² was applied to the opposite surface), and 6 g of physiological saline was injected all at once from the injection port. The amount of mass reduction of the napkin was measured every time, and the amount of weight reduction was regarded as the liquid transpiration amount. This experiment and measurement were performed under conditions of room temperature 23 ° C. and humidity 50%. Moreover, the sanitary napkin to be measured was used after being allowed to stand for 12 hours in the same environment as the measurement and acclimatized. In this measurement result, it can be judged that the smaller the numerical value of the liquid transpiration amount, the better the transpiration suppression effect of the body fluid, and the evaluation becomes high.

  As is apparent from Table 1, the amount of liquid transpiration of Example 1 is smaller than that of each Comparative Example at each measurement time, and it can be seen that the sanitary napkin of Example 1 is excellent in the effect of suppressing transpiration of body fluid. . From this, in order to suppress the transpiration of body fluids such as menstrual blood and urine during wearing and to obtain an absorbent article that can effectively prevent stuffiness and skin troubles, a surface layer (surface sheet) and an absorbent layer ( It can be seen that it is effective to arrange an intermediate layer (intermediate sheet) containing glycerin between the absorbent core and an uneven shape on the skin facing surface side of the surface layer.

  Further, in Reference Example 1 in which a polysaccharide as a thickener was contained in the intermediate sheet, glycerin was effective in suppressing transpiration despite the significant increase in the viscosity of the physiological saline after injection of the physiological saline. The one used was superior in each measurement time. Moreover, in Example 1, since the increase in the viscosity of the physiological saline as in Reference Example 1 was not observed, the physiological saline can easily pass through the top sheet and the intermediate sheet, and the arrival at the absorber is made smooth. Therefore, it is considered that the above-described technical idea of the present invention is advantageous for the body fluid absorption performance and the liquid leakage suppressing effect.

1 Sanitary napkin (absorbent article)
2,2A, 2B, 2C, 2D Surface sheet (surface layer)
21 convex part 22 concave part 23A, 23C 1st fiber layer 24A, 24C 2nd fiber layer 26 collar part (convex part)
27 Groove (recess)
3 Back sheet (leak-proof layer)
4 Absorber (Liquid Absorption Layer)
10 Intermediate sheet (intermediate layer)
X Vertical direction Y Horizontal direction

Claims (6)

An absorbent article comprising a liquid-permeable surface layer that forms a skin-facing surface, a liquid-impermeable leak-proof layer that forms a non-skin-facing surface, and a liquid-retaining liquid-absorbing layer interposed between both layers There,
The absorbent article which comprises the intermediate | middle layer containing glycerol between the said surface layer and the said absorption layer, and the skin opposing surface side of the said surface layer has comprised uneven | corrugated shape.   The absorptive article according to claim 1 with which a convex part which constitutes the unevenness shape of said surface layer is filled with fiber.   The absorptive article according to claim 1 whose convex part which constitutes said concavo-convex shape of said surface layer is hollow.   The absorbent article according to any one of claims 1 to 3, wherein the concave portions constituting the concave-convex shape of the surface layer have a higher density than the convex portions constituting the concave-convex shape.   The surface layer has a first fiber layer located on the side close to the wearer's skin and a second fiber layer located on the side far from the wearer's skin, and both fiber layers are partially formed. Are integrated in the thickness direction by a large number of joints, and the portion of the first fiber layer located between the joints is raised in a convex shape to form the concave-convex convex portion. The absorbent article as described in any one of Claims 1-3.   The absorptive article according to any one of claims 1 to 5 in which said leak-proof layer has moisture permeability.

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