WO2017209071A1 - Absorbent article - Google Patents

Abstract

This absorbent article (1) includes an absorbent core (41) having an elongated shape in a front-back direction, and a discharging portion facing portion (B) to be disposed facing a fluid discharging portion of a user. The absorbent article (1) is provided with a hemagglutination agent (8). The absorbent core (41) has, on the discharging portion facing portion (B), recessed portions (43) which have a reduced thickness and are not connected to a surface sheet (2). The hemagglutination agent (8) is disposed in the discharging portion facing portion (B) of the absorbent core (41) or in the discharging portion facing portion (B) of a constituent member of the absorbent article (1) located further toward the skin facing surface than the absorbent core (41).

Description

Absorbent articles

The present invention relates to an absorbent article.

Patent Document 1 discloses a technique related to a menstrual band containing an inorganic metal salt, and hemoglobin in menstrual blood is agglomerated by the metal inorganic salt and passes through a colorless fluid for absorption in other parts of the pad. It is said that. Patent Document 2 discloses a sanitary napkin containing a blood gelling agent, and exemplifies a partially hydrated dicarboxylic anhydride copolymer or polycation as the blood gelling agent. Patent Document 3 discloses a personal care absorbent article having a porous nonwoven web treated with a fluid treatment agent suitable for modifying red blood cells, and includes triblock containing polypropylene oxide and polyethylene oxide as fluid treatment agents. Examples are polymers or polycations.

As another technique, the present applicant has proposed an absorbent article having an absorbent core in which a plurality of transverse grooves extending in the width direction is formed (Patent Document 4). Since the transverse groove which the absorptive core of patent documents 4 has is formed by reducing the basis weight of the material for forming the absorptive core, there is a sense of incongruity due to wrinkles or breakage of the absorptive core when the absorbent article is worn. It is hard to give, and a feeling of wear becomes good.

Japanese Patent Publication No. 38-17449 JP-A-57-153648 Special table 2002-528232 gazette JP 2014-104093 A

The present invention has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular to the longitudinal direction, and has an absorbent core having a long shape in the longitudinal direction, and is disposed opposite to the liquid excretion part of the wearer. It is an absorbent article which has the excretion part opposing part. The absorbent article includes a hemagglutinating agent. The said absorptive core has a thin recessed part which is not joined to the said surface sheet in the said excretion part opposing part. The hemagglutinating agent is disposed in the excretion part facing part of the absorbent core or the excretion part facing part of the constituent member of the absorbent article located on the skin facing surface side of the absorbent core.

FIG. 1 is a perspective view of a sanitary napkin which is a preferred embodiment of the absorbent article of the present invention. FIG. 2 is a sectional view schematically showing a section taken along line II-II in FIG. FIG. 3 is a partially broken perspective view showing an absorbent core and a core wrap sheet constituting the absorbent body of the sanitary napkin shown in FIG. FIG. 4 is a plan view showing an absorbent core included in the sanitary napkin shown in FIG. 2. FIG. 5 is a cross-sectional view schematically showing a cross section taken along line VV of FIG. 6 (a) and 6 (b) are schematic views showing a cross-section along the circumferential direction of the fiber drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 6A shows a state before the absorbent core forming material is deposited in the accumulation recess, and FIG. 6B shows a state in which the absorbent core formation material is deposited in the accumulation recess. FIG. 7 is a cross-sectional view of an absorbent body showing a blood clot formed by the hemagglutinating agent contained in the core wrap sheet shown in FIG. 5 when the napkin shown in FIG. 1 is used. FIG. 8: is a top view which shows the absorptive core with which the sanitary napkin of other embodiment of the absorbent article of this invention is provided. FIG. 9 is a plan view showing an absorbent core included in a sanitary napkin according to still another embodiment of the absorbent article of the present invention.

Detailed Description of the Invention

In the absorbent articles described in Patent Literature 1 to Patent Literature 3, red blood cell components can be aggregated, but the absorption means for the colorless fluid component that has been filtered and passed is not sufficiently taken into consideration, and is continuously discharged. Aggregates formed at an early stage of menstrual blood obstruct later menstrual blood absorption. In addition, there is a problem that the formed aggregate of red blood cell components gives wet back (liquid return) due to a load from the body at the time of wearing, and gives the wearer a sticky discomfort. Although Patent Document 2 and Patent Document 3 describe that a fluid treatment agent containing a polycation can be used, only data on a nonionic treatment agent is actually disclosed.

Patent Document 4 does not describe anything about using a hemagglutinating agent. Therefore, Patent Document 4 does not naturally describe or suggest the positional relationship between the absorbent core and the hemagglutinating agent.

The present invention relates to an absorbent article that can eliminate the disadvantages of the above-described conventional technology.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on a sanitary napkin 1 (hereinafter also referred to as “napkin 1”) which is a preferred embodiment thereof. The napkin 1 includes an absorbent core 41 having a shape that is long in the front-rear direction, and has an excretion part facing part B that is disposed to face a liquid excretion part (such as a vaginal opening) of the wearer. The napkin 1 includes a hemagglutinating agent 8. FIG. 1 shows a perspective view of a napkin 1 which is a preferred embodiment of the absorbent article of the present invention, and FIG. 2 shows a cross-sectional view of the napkin 1. The absorbent article of the present invention is preferable for menstrual blood absorption.

In this embodiment, as shown in FIGS. 1 and 2, the napkin 1 includes a liquid-permeable surface sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and both of these sheets 2. 3 has an absorbent main body 10 including an absorbent body 4 provided with an absorbent core 41. The absorbent body 4 has an absorbent core 41 containing a superabsorbent polymer and a core wrap sheet 42 that covers the skin facing surface and the non-skin facing surface of the absorbent core 41.

As shown in FIG. 1, the absorbent main body 10 of the napkin 1 is a wearer than the excretion part facing part B, which is disposed opposite to the excretion part (vagina mouth or the like) of the wearer when worn, and the wearer facing part B. The front part A which is arranged closer to the abdomen (front side) and the rear part C which is arranged closer to the wearer's back side (rear side) than the excretory part facing part B, It has a long shape. The napkin 1 and the absorbent main body 10 have a longitudinal direction X corresponding to the wearer's front-rear direction, a lateral direction Y orthogonal to the longitudinal direction X, and a thickness direction Z. That is, the absorptive main body 10 is divided in the order of the front part A, the excretion part opposing part B, and the rear part C in the longitudinal direction X which is the front-back direction.

Moreover, in this specification, a skin opposing surface is a surface in the napkin 1 or its component (for example, surface sheet 2) orient | assigned to a wearer's skin side at the time of wear of the napkin 1, and a non-skin opposing surface is a napkin. 1 or a component thereof, which is a surface directed to the side opposite to the skin side (clothing side) when the napkin 1 is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction (direction orthogonal to the longitudinal direction) of the napkin 1 and the absorbent main body 10.

In the present embodiment, as shown in FIGS. 1 and 2, the napkin 1 is further laterally extended from both side portions along the longitudinal direction X of the excretory part-facing portion B of the absorbent main body 10 in addition to the absorbent main body 10. It has a pair of wing parts 10W and 10W extending outward of Y.

In the absorbent article of the present invention, the excretory part facing part B is a region having one wing 10W in the longitudinal direction X (one wing) when having the wing part 10W like the napkin 1 of the present embodiment. Means a region sandwiched between a root along the vertical direction X of the portion 10W and a root along the vertical direction X of the other wing portion 10W. Moreover, in the case of the absorbent article which does not have a wing part, when the absorbent article is folded into the three-fold individual form, two folding lines (crossing the absorbent article in the lateral direction Y ( (Not shown) means a region surrounded by a first folding line and a second folding line as counted from the front end in the longitudinal direction X of the absorbent article.

In the napkin 1 of the present embodiment, the top sheet 2 covers the entire skin facing surface of the absorbent body 4 as shown in FIG. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. A side flap portion 10 </ b> S is formed together with the forming sheet 7. The leak-proof cuff forming sheet 7 and the back sheet 3 fixed to the skin-facing surface of the top sheet 2 are adhesives, heat seals, ultrasonic waves at the extended portions from both ends in the longitudinal direction X of the absorber 4. They are joined together by a known joining means such as a seal. In addition, between each of the top sheet 2 and the back sheet 3 and the absorbent body 4 may be joined by an adhesive.

In the napkin 1, the leak-proof cuff forming sheet 7 includes both side portions along the longitudinal direction X on the skin facing surface of the surface sheet 2 disposed on the skin facing surface of the absorbent main body 10 as shown in FIGS. 1 and 2. It is arranged and fixed. Preferably, the leak-proof cuff forming sheet 7 is arranged and fixed over the entire length in the longitudinal direction X of the absorbent main body 10 so as to overlap both left and right side portions along the longitudinal direction X of the absorbent body 4 in plan view. ing.

In the napkin 1, each of the pair of leak-proof cuff forming sheets 7 and 7 has a folded portion 71 that is folded outward in the lateral direction Y, as shown in FIGS. 1 and 2, respectively. 71 is joined onto the topsheet 2 at a joint 72 located slightly outward in the lateral direction Y. The leak-proof cuff forming sheet 7 has a leak-proof cuff forming elastic member 74 in the vicinity of the free end portion 73 that forms the free end of the leak-proof cuff, and when worn, the leak-proof cuff forming elastic member 74. Due to the contraction force, the space between the joint 72 and the free end 73 in the excretory part facing part B stands up toward the wearer's skin to form a leak-proof cuff. The leak-proof cuff has an upright property and can prevent side leakage of menstrual blood excreted on the skin-facing surface.

In the napkin 1, as shown in FIG. 1, the side flap part 10S protrudes greatly outward in the lateral direction Y at the excretory part facing part B, and thereby the left and right along the longitudinal direction X of the absorbent main body 10 A pair of wing portions 10W and 10W are extended on both sides.

The wing part 10W is used by being folded back to the non-skin facing surface side of the crotch part of clothes such as shorts. In the napkin 1, the wing portion 10 </ b> W has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is located on a side portion along the longitudinal direction X of the absorbent main body 10 in a plan view, as shown in FIG. 1. It has a shape. On the non-skin facing surface of the wing part 10W, a wing part adhesive part for fixing the wing part 10W (napkin 1) to clothes (not shown) such as shorts is formed, and this wing part adhesive part is used. Sometimes, the wing portion 10W folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothes can be adhesively fixed to the crotch portion. Moreover, the main body adhesion part (not shown) for fixing the absorptive main body 10 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 10.

As shown in FIGS. 1 and 2, the napkin 1 is integrated with the skin facing surface (skin facing surface of the top sheet 2) of the absorbent main body 10, and the top sheet 2 and the absorber 4 are integrated toward the back sheet 3 side. A linear squeezing groove 9 is provided. “Linear” in the linear compressed groove 9 means that the shape of the groove (concave portion) is not limited to a straight line in a plan view but includes a curved line. Each line may be a continuous line or a discontinuous line such as a broken line. For example, the squeezing groove 9 may be composed of a row formed by a number of discontinuous point embosses. The compressed groove 9 configured in this way is a groove different from a groove portion 43 described later formed only in the absorbent core 41 of the absorbent body 4. Moreover, the pressing groove 9 can be formed by performing the embossing accompanying pressurization or a heating and pressurization. Moreover, the pressing groove 9 may be in a state where its constituent fibers are heat-sealed. In any case, the density of the compressed groove 9 is higher than the density of other parts excluding the compressed groove 9.

In the napkin 1, as shown in FIG. 1, the pressing grooves 9 are formed in the front portion A and the rear portion C, respectively, in the horizontal pressing groove 91 extending in the horizontal direction Y, and on both sides along the vertical direction X. It has a vertical squeezing groove 92 extending in the longitudinal direction X from the front part A to the rear part C. In the napkin 1, the lateral squeezing grooves 91 of the front part A and the rear part C extend in the lateral direction Y while forming a convex curved shape outward in the longitudinal direction X. In the napkin 1, the lateral pressing groove 91 of the front part A, one vertical pressing groove 92, the horizontal pressing groove 91 of the rear part C, and the other vertical pressing groove 92 are connected to form a ring-shaped circumferential groove. . The compressed groove 9 formed in this way can effectively prevent liquid leakage from the periphery of the napkin 1 by suppressing diffusion of body fluid flowing in the plane direction on the top sheet 2.

The absorbent core 41 is formed from a fiber assembly made of a fiber material containing pulp fibers, and in the napkin 1, the fiber assembly is formed by holding a superabsorbent polymer. Thus, the absorptive core 41 of the napkin 1 contains the pulp fiber and the superabsorbent polymer. The absorbent core 41 is covered with a core wrap sheet 42 on both the skin facing surface and the non-skin facing surface. In the napkin 1, as shown in FIG. 2, a single core wrap sheet 42 is used. One core wrap sheet 42 has a length that is at least twice as long as the length of the absorbent core 41 in the lateral direction Y. And the center part of the horizontal direction Y of one core wrap sheet | seat 42 is piled up on the skin opposing surface of the absorbent core 41, and the both ends of the horizontal direction Y of one core wrap sheet | seat 42 of the absorbent core 41 are piled up. Fold it back to the non-skin-facing surface and overlap the folded edges. In this way, both the skin facing surface and the non-skin facing surface of the absorbent core 41 are covered with one core wrap sheet 42. The core wrap sheet 42 is used for the purpose of preventing leakage of the forming material of the absorbent core 41 and improving the shape retention of the absorbent core 41. Between the top sheet 2 and the core wrap sheet 42 covering the skin facing surface side of the absorbent core 41, and between the back sheet 3 and the core wrap sheet 42 covering the non-skin facing surface side of the absorbent core 41. Are preferably joined to each other by a pattern-coated adhesive such as dots, spirals, stripes or the like.

As the superabsorbent polymer that the absorbent core 41 has, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. In general, a polymer or copolymer of acrylic acid or alkali metal acrylate can be used as the superabsorbent polymer. Examples thereof include polyacrylic acid and salts thereof and polymethacrylic acid and salts thereof. As the polyacrylate and polymethacrylate, sodium salts can be preferably used. In addition, acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, styrenesulfonic acid, etc. It is also possible to use a copolymer obtained by copolymerizing the above-mentioned comonomer within a range that does not deteriorate the performance of the superabsorbent polymer.

In the napkin 1, as shown in FIGS. 3 and 4, the absorbent core 41 has a shape that is long in the same direction as the longitudinal direction X of the napkin 1. Therefore, the longitudinal direction X of the absorbent core 41 is the same as the longitudinal direction X of the absorbent main body 10 of the napkin 1, and the lateral direction Y of the absorbent core 41 is the lateral direction Y of the absorbent main body 10 of the napkin 1. Is in the same direction.

In the napkin 1, as shown in FIG. 4, the absorptive core 41 has the thin recessed part 43 in the excretion part opposing part B. As shown in FIG. Here, the “thin concave portion 43” means that the bottom has a thickness even though it is thin in the thickness direction Z, and penetrates the absorbent core 41 without any constituent material of the absorbent core. It is a site that includes both cases and is thinner than other sites. However, it is preferable that the “thin recess 43” has a bottomed portion made of the constituent material of the absorbent core. When the recessed part 43 is bottomed, it is preferable that the basic weight of the bottom part is lower than the other area of the absorptive core 41, specifically the basic weight of the small absorption part 44 mentioned later. The concave portion 43 of the napkin 1 is a groove portion (hereinafter also referred to as the groove portion 43) extending in a groove shape. Here, the “groove portion” means a portion of the concave portion 43 that extends in the surface direction composed of the vertical direction X and the horizontal direction Y with a length of 5 times or more the width (groove width) of the concave portion 43. .

Moreover, the absorptive core 41 has the part which the recessed part 43 has not joined to the surface sheet in the excretion part opposing part B. FIG. By the said structure, in the excretion part opposing part B, it has a site | part in which space was formed between the absorptive core 41 and the surface sheet 2. FIG. In addition, in the napkin 1 of this embodiment, although the recessed part 43 is joined with the surface sheet 2 in the part in which the pressing groove 9 exists in the absorptive core 41, such joining is performed in the other recessed part 43. Not. In this invention, it is not necessary that the recessed part 43 and the surface sheet are not joined in the excretion part opposing part B whole region, and it should just be such a structure in part. It will be described later that the concave portion 43 present in the excretory part facing part B and the topsheet 2 are not joined at 30% or more, particularly 50% or more of the total area of the concave part 43 present in the excretory part facing part B. This is preferable because the above effect can be further exhibited. Furthermore, like the napkin 1 of this embodiment, when the absorber 4 has the absorptive core 41 and the core wrap sheet | seat 42 which coat | covers the absorptive core 41, the recessed part 43 in the absorptive core 41 is the surface. It is preferable that not only the sheet 2 but also the core wrap sheet 42 is not joined. With this configuration, the formed erythrocyte aggregate is more difficult to return to the wearer's skin.

In the napkin 1, as shown in FIG. 4, the absorbent core 41 includes a block 43 having a relatively low basis weight and a plurality of small absorbent portions 44 having a relatively high basis weight and surrounded by the groove 43. The structure has at least block regions BT arranged in the vertical direction X in the excretory part facing part B. In the napkin 1, the groove 43 has a lateral groove 43 </ b> Y extending in the lateral direction Y of the absorbent core 41 and a longitudinal groove 43 </ b> X extending in the longitudinal direction X of the absorbent core 41. The recessed part 43 of the absorptive core 41 is open to the skin facing surface side in the present embodiment, and in the napkin 1, the groove 43 is open to the skin facing surface side. In other words, the bottom 43 of the groove 43 of the napkin 1 is arranged on the non-skin facing surface side in the thickness direction Z of the absorbent core 41.

Moreover, in the napkin 1, as shown in FIG. 4, the absorptive core 41 has the middle-high part 45 thicker than the peripheral area | region 46 in the at least center part of the horizontal direction Y in the excretion part opposing part B. As shown in FIG. The middle-high part 45 is formed thicker than the thickness in the peripheral region 46 excluding the middle-high part 45 in the absorbent core 41, and the napkin 1 is raised toward the skin side of the wearer. The middle-high part 45 of the napkin 1 has the excretion part middle-high part 45B formed in the center part of the horizontal direction Y in the excretion part opposing part B, and the back middle high part 45C in the center part of the horizontal direction Y in the back part C. Yes. The excretory part middle-high part 45B bulges outward in the lateral direction Y from the middle middle-high part 45BC having a vertically long shape in the longitudinal direction X of the absorbent core 41 and both side edges along the longitudinal direction X of the middle middle-high part 45BC. It has side middle and high parts 45BS, 45BS.

In the napkin 1, as shown in FIG. 2, the presence of the excretion part middle / high part 45 </ b> B under the top sheet 2, the lateral side central part of the skin facing surface in the excretion part facing part B The excretion part protruding part 10B which protrudes toward the surface is formed (see FIG. 1), and the rear middle-high part 45C is present below the top sheet 2, whereby the laterally central part of the skin facing surface in the rear part C 10C of back protrusions which protrude toward a wearer's skin side are formed (refer FIG. 1). It is preferable that 10 C of back bulge parts are arrange | positioned facing a wearer's crack when the napkin 1 is worn. Particularly, when the napkin 1 is a night napkin, it is preferable because leakage from the rear can be prevented by the rear raised portion 10C. In particular, a night napkin having a total length of 30 cm or more preferably has the rear raised portion 10C.

In the napkin 1, as shown in FIG. 2, the excretory part middle high part 45 </ b> B having the middle middle high part 45 </ b> BC and the pair of side middle high parts 45 </ b> BS, 45 </ b> BS is thicker than the thickness in the peripheral region 46 of the absorbent core 41. It is formed in the excretion part opposing part B. Although the excretion part middle high part 45B may be formed only in the excretion part opposing part B, in the napkin 1, as shown in FIG.1 and FIG.4, it extends over a part of the back part C from the excretion part opposing part B. It is extended. Preferably, the pair of side middle high portions 45BS, 45BS are formed in the excretory portion facing portion B, and the middle middle high portion 45BC extends from the excretory portion facing portion B to a part of the rear portion C. is doing.

In the napkin 1, as shown in FIG. 4, the absorbent core 41 including the middle-high portion 45 having the excretory portion middle-high portion 45 </ b> B and the rear middle-high portion 45 </ b> C and the peripheral region 46 has a lateral groove portion extending in the lateral direction of the absorbent core 41. The absorbent core 41 is formed with a plurality of small absorbent portions 44 arranged along the longitudinal direction X of the absorbent core 41. In the napkin 1, the absorbent core 41 including the middle and high portions 45 is divided by the longitudinal groove portions 43 </ b> X extending in the longitudinal direction X of the absorbent core 41, whereby the absorbent core 41 includes the absorbent core 41. A plurality of small absorbing portions 44 arranged in the horizontal direction Y are formed. Therefore, the absorbent core 41 of the napkin 1 has a block region BT in which a plurality of block structures each having a plurality of small absorbent portions 44 surrounded by the lateral groove portions 43Y and the vertical groove portions 43X are arranged in the vertical direction X. It is formed not only from the part B but from the front part A to the rear part C.

In the napkin 1, as shown in FIG. 5, the thickness of the excretory part middle high part 45B having the center middle high part 45BC and the pair of side middle high parts 45BS, 45BS protrudes toward the skin on the skin-facing surface of the napkin 1. From the viewpoint of improving the liquid absorbency and the like in the excretory part facing part B by forming the excretion part raised part 10B (see FIG. 1), preferably 120% or more of the thickness of the peripheral region 46 of the absorbent core 41, More preferably, it is 150% or more, preferably 500% or less, more preferably 400% or less, and preferably 120% or more and 500% or less, more preferably 150% or more and 400% or less. Further, the difference in thickness (the former-the latter) between the thickness of the excretion part middle high part 45B and the thickness of the peripheral region 46 of the absorbent core 41 is preferably 1 mm or more, more preferably 1.5 mm or more. Is 8 mm or less, more preferably 6 mm or less, and preferably 1 mm or more and 8 mm or less, more preferably 1.5 mm or more and 6 mm or less.
Further, the thickness of the central middle high portion 45BC and the thickness of the side middle high portion 45BS may be the same or different as long as the thickness is within the above range.
In addition, the thickness of the peripheral region 46 of the absorbent core 41 means that when the concave portion 43 such as the groove 43 extending in the surface direction of the absorbent core 41 is formed in the peripheral region 46, such a concave portion 43 exists. It is the thickness in the part which does not.
Similarly, the thickness of the excretion part middle high part 45B is such that when the concave part 43 such as the groove part 43 extending in the surface direction of the absorbent core 41 is formed in the excretion part middle high part 45B, such a concave part 43 exists. It is the thickness in the part which does not.
Moreover, the excretion part middle high part 45B of the absorptive core 41 preferably has a thickness in the groove part 43 of 70% or less of the thickness of the part other than the groove part 43 (same as the thickness of the small absorption part 44 of the excretion part middle high part 45B), More preferably, it is 50% or less, preferably 20% or more, more preferably 30% or more, and preferably 20% or more and 70% or less, more preferably 30% or more and 50% or less. Within this range, erythrocyte aggregates are easily captured and follow the movement of the wearer, so that the erythrocyte aggregates are less likely to migrate to the skin side while the napkin 1 is worn. Moreover, when the lower limit of the thickness of the groove part 43 is 20% or more, after the separated plasma component moves to the non-skin facing surface side of the absorbent core 41, the non-skin facing surface side from the bottom of the groove part 43 Since the absorbent core portion located in the region can be diffused, the absorption performance is excellent and the plasma component can be further suppressed from returning to the skin side, which is preferable.
The thickness of each part of the absorbent core 41 is measured from a photograph of the cut end surface of the absorbent article under no load.

In the napkin 1, as shown in FIG. 3, the thickness of the rear middle high portion 45 </ b> C is formed on the skin-facing surface of the napkin 1 by forming a rear raised portion 10 </ b> C (see FIG. 1) that protrudes toward the skin. Is preferably smaller than the thickness of the excretion part middle high part 45B, preferably 110% or more, more preferably 140% of the thickness of the peripheral region 46 of the absorbent core 41. % Or more, preferably 400% or less, more preferably 300% or less, and preferably 110% or more and 400% or less, more preferably 140% or more and 300% or less. Further, the difference in thickness between the thickness of the rear middle high portion 45C and the thickness of the peripheral region 46 of the absorbent core 41 (the former-the latter) is preferably 0.5 mm or more, more preferably 1.0 mm or more, Preferably they are 5.0 mm or less, More preferably, it is 4.0 mm or less, Preferably they are 0.5 mm or more and 5.0 mm or less, More preferably, they are 1.0 mm or more and 4.0 mm or less. It should be noted that the thickness of the rear middle high portion 45C is a portion where such a concave portion 43 does not exist when the concave portion 43 such as a groove 43 extending in the surface direction of the absorbent core 41 is formed in the rear middle high portion 45C. It is thickness. Further, the rear middle high portion 45C of the absorbent core 41 preferably has a thickness in the groove portion 43 of 70% or less, more preferably the thickness of the portion other than the groove portion 43 (same as the thickness of the small absorbent portion 44 of the rear middle high portion 45C). Is 50% or less, preferably 10% or more, more preferably 20% or more, and preferably 10% or more and 70% or less, more preferably 20% or more and 50% or less.
The thickness of each part of the absorbent core 41 is measured from a photograph of the cut end surface of the absorbent article under no load.

In the napkin 1, as shown in FIG. 4, in the absorbent core 41, the peripheral region 46 that is an annular region that collectively surrounds the excretory portion middle and high portions 45 </ b> B and 45 </ b> C has a thickness in the groove portion 43. Preferably the thickness of the portion other than 43 (same as the thickness of the small absorption portion 44 in the peripheral region 46) is 70% or less, more preferably 50% or less, and preferably 5% or more, more preferably 10% or more. Also, it is preferably 5% or more and 70% or less, more preferably 10% or more and 50% or less. If the relationship between the thickness of the groove portion 43 in the peripheral region 46 and the thickness of the portion other than the groove portion 43 is within the above range, red blood cell aggregates are easily captured and the movement of the wearer is easily followed. Aggregates are less likely to move to the skin side while the napkin 1 is being worn. Further, when the lower limit value of the thickness of the groove 43 is 20% or more of the portion other than the groove 43, the separated plasma component moves to the non-skin facing surface side of the absorbent core 41, and then the groove 43. Since the absorbent core portion located on the non-skin facing surface side from the bottom of the skin can be diffused, it is preferable because the absorption performance is excellent and the plasma component can be further suppressed from returning to the skin side.
The thickness of each part of the absorbent core 41 is measured from a photograph of the cut end surface of the absorbent article under no load.

In the napkin 1, as shown in FIG. 4, the excretion part middle high part 45 </ b> B and the rear middle high part 45 </ b> C are each formed of a material for forming the absorbent core 41 (hereinafter “core material”) rather than the peripheral region 46 of the absorbent core 41. It is formed by increasing the basis weight. That is, the small absorbent portion 44 of the excretion portion middle high portion 45B and the small absorbent portion 44 of the rear middle high portion 45C each have a basis weight of the core material higher than a basis weight of the small absorbent portion 44 in the peripheral region 46 of the absorbent core 41. Is also big. Since the absorbent core 41 in this embodiment has a difference in the basis weight of the core material to provide a thickness difference, it is different from the case where a thickness difference is provided by compressing a part of the absorbent core having a uniform basis weight. In contrast, the absorbent core 41 is also flexible as a whole in the peripheral region 46.

In the napkin 1, as shown in FIG. 4, the groove 43 having the lateral groove 43 </ b> Y and the vertical groove 43 </ b> X is made of the core material from the excretion part middle high part 45 </ b> B, the rear middle high part 45 </ b> C and other parts in the peripheral region 46. Reduced and formed. That is, the groove portion 43 has the lowest basis weight of the core material. Further, unlike the case where a groove portion formed by compressing a part of a portion having a uniform basis weight is provided, the density of the core material in the groove portion 43 is lower than the density in the small absorption portion 44.

The small absorbent portion 44 of the middle-high portion 45 has a basis weight of preferably 250 g / m ² or more, more preferably 300 g / m ² or more, and preferably 1000 g / m ² or less, more preferably 800 g / m ^2. In addition, it is preferably 250 g / m ² or more and 1000 g / m ² or less, more preferably 300 g / m ² or more and 800 g / m ² or less.
The basis weight of the small absorbent portion 44 in the peripheral region 46 is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 700 g / m ² or less, more preferably 600 g / m ² or less. Moreover, it is preferably 100 g / m ² or more and 700 g / m ² or less, more preferably 150 g / m ² or more and 600 g / m ² or less.
Moreover, it is preferable that the basic weight of the small absorption part 44 of the middle-high part 45 is larger than the basic weight of the small absorption part of the peripheral region 46.
The basis weight of each of the horizontal groove portion 43Y and the vertical groove portion 43X is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less. Moreover, it is preferably 10 g / m ² or more and 500 g / m ² or less, more preferably 20 g / m ² or more and 400 g / m ² or less.

The basis weight of the core material in the groove portion 43 is cut by cutting the boundary between the groove portion 43 and other portions, and the mass of the narrow sample is divided by the area of the surface of the sample facing the skin, for example. Ask. The basis weight of the portion other than the groove portion 43 is obtained by dividing the mass of the sample obtained by cutting out the portion other than the groove portion 43 by the area of the surface of the sample on the skin facing surface side, for example.

In the napkin 1, the entire absorbent core 41 having the middle-high portion 45, the peripheral region 46, and the groove 43 is integrally formed. “Integrally molded” means that the same material is used to form parts in one process, unlike the case where members manufactured in different processes are joined by means of bonding, such as adhesives or compression. Means that

As shown in FIG. 6A, the absorbent core 41 of the napkin 1 described above has a stacking recess 55 on the outer peripheral surface and rotates in one direction R, and the outer periphery of the stacking drum 54 It can be manufactured using a fiber stacking device provided with a duct (not shown) for supplying the core material in a scattered state on the surface.
A plurality of stacking recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54. The bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.

As shown in FIG. 6A, two concave portions 56b and 56c for forming the excretory portion middle high portion 45B and the rear middle high portion 45C are formed on a part of the bottom surface 56 of the accumulation concave portion 55. Yes. Further, a breathable member 57 for forming the groove portion 43 in the excretion portion middle high portion 45B is disposed at the bottom portion of the concave portion 56b, and the groove portion 43 is formed in the rear middle high portion 45C also at the bottom portion of the concave portion 56c. For this purpose, a breathable member 57 is disposed. Further, a non-breathable member 58 for forming the groove 43 is formed on the bottom surface 56 of the accumulation recess 55 other than the recesses 56b and 56c. The non-breathable members 57 and 58 are fixed so as to protrude from the bottom surface of the accumulation recess 55, and may be non-breathable members, for example, made of metal, plastic, ceramic, or the like.

As shown in FIG. 6B, by supplying a core material such as pulp fiber into the duct while sucking from the bottom surface of the accumulation concave portion 55, as in a known fiber pile device including a fiber pile drum. In addition, the core material is deposited in a predetermined shape in the accumulation recess 55. The absorbent core 41 is obtained by releasing the deposit 40 from the accumulation recess 55. The absorbent core 41 is pressed and appropriately compressed by passing between a pair of rolls before or after coating with the core wrap sheet 42. As a result, the portion made of the core material deposited on the air-permeable member 57 becomes the groove portion 43 having a relatively small basis weight and density, and is deposited on the bottom surface of the concave portions 56b and 56c that does not have the air-permeable member 57. The part which became the excretion part middle high part 45B and the back middle high part 45C which have the small absorption part 44 with relatively large basic weight and density. Similarly, in the portions other than the concave portions 56b and 56c, the portion made of the core material deposited on the air-permeable member 58 becomes the groove portion 43 having a relatively small basis weight and density, and does not have the air-permeable member 58. A portion deposited on the bottom surface becomes a peripheral region 46 having a small absorption portion 44 having a relatively large basis weight and density. The superabsorbent polymer constituting the core material of the absorbent core 41 is contained in the fiber assembly by providing a superabsorbent polymer introduction part in the middle of the duct.

The hemagglutinating agent 8 is disposed on the excretory part facing part B of the absorbent core 41 or the excretory part facing part B of the constituent member of the napkin 1 located on the skin facing surface side of the absorbent core 41. Then, it is distribute | arranged to the excretion part opposing part B in the structural member of the napkin 1. FIG. Here, as a structural member located on the skin-facing surface side of the absorbent core 41 in the napkin 1, the surface sheet 2 or the core wrap sheet 42 may be mentioned. In this embodiment, as shown in FIG. The agent 8 is disposed on the core wrap sheet 42.
In addition, when the 2nd sheet | seat comprised by the nonwoven fabric is distribute | arranged between the surface sheet 2 and the absorber 4, the hemagglutination agent 8 may be distribute | arranged to this 2nd sheet | seat. The second sheet is a sheet called a sub-layer sheet in the technical field that is separate from the top sheet 2 and the absorber 4. The sub-layer sheet is a sheet that plays a role of improving the liquid permeability from the top sheet 2 to the absorber 4 or reducing the return of the liquid absorbed by the absorber 4 to the top sheet 2. is there.

The hemagglutinating agent 8 provided in the napkin 1 acts to agglutinate erythrocytes in blood to form aggregates and separate them from plasma components. A preferred hemagglutinating agent has the property that when 1000 ppm of a measurement sample agent is added to simulated blood, at least two erythrocytes aggregate to form an agglomerate while maintaining blood fluidity. It is. Here, “the state in which the fluidity of blood is maintained” means that 10 g of the simulated blood to which the measurement sample agent is added is a screw tube bottle (product number “Screw tube No. 4” manufactured by Marem Co., Ltd., mouth inner diameter 14.5 mm) , Body diameter 27 mm, total length 55 mm), and when the screw tube bottle containing the simulated blood is inverted 180 degrees, it means that 60% or more simulated blood flows down within 20 seconds. The pseudo blood, B-type viscometer (Toki Sangyo Co., Ltd. model number TVB-10M, measurement conditions: Rotor No.19,30rpm ² 5 ℃, 60 seconds) so that the measured viscosity with becomes 8 mPa · s The blood cell / plasma ratio of defibrinated horse blood (manufactured by Nippon Biotest Laboratories, Inc.) was prepared. Further, whether or not “two or more erythrocytes aggregate to form an aggregate” is determined as follows. That is, the simulated blood to which 1000 ppm of the measurement sample agent was added was diluted 4000 times with physiological saline, and a laser diffraction / scattering type particle size distribution measuring device (manufactured by HORIBA, Inc., model number: LA-950V2, measurement condition: flow type cell measurement). When the median diameter of the volume particle diameter measured at a temperature of 25 ° C. is 10 μm or more by a laser diffraction scattering method using a circulation speed of 1 and no ultrasonic wave, two or more red blood cells are aggregated. It is judged that an agglomerate is formed.

As the hemagglutinating agent 8 used in the absorbent article of the present invention, a cationic polymer is suitable. Examples of the cationic polymer include cationized cellulose and cationized starch such as hydroxypropyltrimonium chloride. The hemagglutinating agent 8 can also contain a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt polycondensate as a cationic polymer. In the present invention, the “quaternary ammonium salt” includes a compound having a plus monovalent charge at the nitrogen atom position, or a compound that generates a plus monovalent charge at the nitrogen atom position by neutralization. Specific examples thereof include a salt of a quaternary ammonium cation, a neutralized salt of a tertiary amine, and a tertiary amine having a cation in an aqueous solution. The “quaternary ammonium moiety” described below is also used in the same meaning and is a moiety that is positively charged in water. Further, in the present invention, the “copolymer” is a polymer obtained by copolymerization of two or more kinds of polymerizable monomers, and is a binary copolymer or a ternary copolymer or more. Includes both things. In the present invention, the “polycondensate” is a polycondensate obtained by polymerizing a condensate composed of two or more monomers. When the hemagglutinating agent 8 includes a quaternary ammonium salt homopolymer and / or a quaternary ammonium salt copolymer and / or a quaternary ammonium salt polycondensate as the cationic polymer, the hemagglutinating agent 8 is , Quaternary ammonium salt homopolymer, quaternary ammonium salt copolymer and quaternary ammonium salt polycondensate may be included, or any combination of two or more may be included. You may go out. Moreover, a quaternary ammonium salt homopolymer can be used individually by 1 type or in combination of 2 or more types. Similarly, the quaternary ammonium salt copolymer can be used alone or in combination of two or more. Furthermore, similarly, a quaternary ammonium salt polycondensate can be used individually by 1 type or in combination of 2 or more types. In the present specification, the “hemagglutinating agent” means that a single compound capable of aggregating blood erythrocytes, a plurality of combinations of the single compounds, or a combination of a plurality of compounds expresses erythrocyte aggregation. It is an agent to do. That is, the hemagglutinating agent is an agent limited to those having a hemagglutination effect. Therefore, when the hemagglutinating agent contains the third component, it is expressed as a hemagglutinating agent composition and is distinguished from the hemagglutinating agent. Here, the term “single compound” is a concept including compounds having the same composition formula but having different molecular weights due to different numbers of repeating units.

Among the various cationic polymers described above, in particular, the use of a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt polycondensate is advantageous from the viewpoint of adsorptivity to erythrocytes. preferable. In the following description, for convenience, the quaternary ammonium salt homopolymer, the quaternary ammonium salt copolymer and the quaternary ammonium salt polycondensate are collectively referred to as “quaternary ammonium salt polymer”.

The quaternary ammonium salt homopolymer is obtained by polymerizing one type of polymerizable monomer having a quaternary ammonium moiety. On the other hand, the quaternary ammonium salt copolymer uses at least one polymerizable monomer having a quaternary ammonium moiety and, if necessary, at least one polymerizable monomer having no quaternary ammonium moiety. It was obtained by using seeds and copolymerizing them. That is, the quaternary ammonium salt copolymer is obtained by using two or more polymerizable monomers having a quaternary ammonium moiety and copolymerizing them, or having a quaternary ammonium moiety. It is obtained by copolymerizing one or more polymerizable monomers having one or more polymerizable monomers having no quaternary ammonium moiety. The quaternary ammonium salt copolymer may be a random copolymer, an alternating copolymer, a block copolymer, or a graft copolymer. The quaternary ammonium salt polycondensate is obtained by polymerizing these condensates using a condensate composed of one or more monomers having a quaternary ammonium moiety. That is, the quaternary ammonium salt polycondensate is obtained by polymerizing two or more condensates having two or more monomers having a quaternary ammonium moiety, or the quaternary ammonium moiety. And a condensate comprising one or more monomers having quaternary ammonium moieties and one or more monomers having no quaternary ammonium moiety, and obtained by condensation polymerization.

The quaternary ammonium salt polymer is a cationic polymer having a quaternary ammonium moiety. A quaternary ammonium moiety can be generated by quaternary ammoniumation of a tertiary amine using an alkylating agent. Alternatively, the tertiary amine can be dissolved in acid or water and generated by neutralization. Or it can produce | generate by the quaternary ammonium formation by the nucleophilic reaction containing a condensation reaction. Examples of the alkylating agent include alkyl halides and dialkyl sulfates such as dimethyl sulfate and dimethyl sulfate. Of these alkylating agents, the use of dialkyl sulfate is preferable because the problem of corrosion that may occur when an alkyl halide is used does not occur. Examples of the acid include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, citric acid, phosphoric acid, fluorosulfonic acid, boric acid, chromic acid, lactic acid, oxalic acid, tartaric acid, gluconic acid, formic acid, ascorbic acid, and hyaluronic acid. . In particular, it is preferable to use a quaternary ammonium salt polymer in which a tertiary amine moiety is quaternized with an alkylating agent, because the electric double layer of erythrocytes can be reliably neutralized. Quaternary ammoniumation by a nucleophilic reaction including a condensation reaction can be caused by a ring-opening polycondensation reaction of dimethylamine and epichlorohydrin or a cyclization reaction of dicyandiamide and diethylenetriamine.

As a result of the inventor's examination, it has been found that it is particularly effective to use a cationic polymer in order to generate an aggregate of red blood cells during menstrual blood. The reason for this is as follows. Red blood cells have a red blood cell membrane on their surface. The erythrocyte membrane has a two-layer structure. This two-layer structure is composed of a red blood cell membrane skeleton as a lower layer and a lipid membrane as an upper layer. The lipid film exposed on the surface of erythrocytes contains a protein called glycophorin. Glycophorin has a sugar chain to which a sugar having an anionic charge called sialic acid is bonded at its end. As a result, erythrocytes can be treated as colloidal particles having an anionic charge. In general, an aggregating agent is used for aggregating the colloidal particles. Considering that erythrocytes are anionic colloidal particles, it is advantageous to use a cationic substance as an aggregating agent from the viewpoint of neutralizing the electric double layer of erythrocytes. Further, if the aggregating agent has a polymer chain, the polymer chains of the aggregating agent adsorbed on the surface of the erythrocyte tend to be entangled with each other, thereby promoting the aggregation of erythrocytes. Further, when the aggregating agent has a functional group, it is preferable because the aggregation of erythrocytes is promoted by the interaction between the functional groups.

From the viewpoint of effectively generating red blood cell aggregates, the cationic polymer preferably has a molecular weight of 2000 or more, more preferably 10,000 or more, and even more preferably 150,000 or more. When the molecular weight of the cationic polymer is not less than these values, the entanglement of the cationic polymers between the erythrocytes and the crosslinking of the cationic polymer between the erythrocytes are sufficiently caused. The upper limit of the molecular weight is preferably 30 million or less, more preferably 22 million or less, and even more preferably 10 million or less. When the molecular weight of the cationic polymer is not more than these values, the cationic polymer dissolves well into menstrual blood. The molecular weight of the cationic polymer is preferably 2000 or more and 30 million or less, more preferably 10,000 or more and 22 million or less, and particularly preferably 150,000 or more and 10 million or less. The molecular weight referred to in the present invention is a weight average molecular weight. Moreover, you may combine 2 or more types of cationic polymers of different molecular weight within the above-mentioned molecular weight range. The molecular weight of the cationic polymer can be controlled by appropriately selecting the polymerization conditions. The molecular weight of the cationic polymer can be measured using HLC-8320GPC manufactured by Tosoh Corporation. Specific measurement conditions are as follows. As the column, a column in which a guard column α and an analytical column α-M manufactured by Tosoh Corporation are connected in series is used at a column temperature of 40 ° C. The detector uses RI (refractive index). As a measurement sample, 1 mg of the treatment agent (quaternary ammonium salt polymer) to be measured is dissolved in 1 mL of the eluent. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate uses an eluent in which 150 mmol / L sodium sulfate and 1% by mass acetic acid are dissolved in water. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate has a molecular weight of 5900, a pullulan with a molecular weight of 47300, a pullulan with a molecular weight of 212,000, and a molecular weight of 788,000 with respect to 10 mL of the eluent. Pullulan, a pullulan mixture with 2.5 mg each dissolved, is used as the molecular weight standard. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate is measured at a flow rate of 1.0 mL / min and an injection amount of 100 μL. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, elution with 50 mmol / L lithium bromide and 1% by mass acetic acid dissolved in ethanol: water = 3: 7 (volume ratio) Use liquid. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, a polyethylene glycol (PEG) having a molecular weight of 106, a PEG having a molecular weight of 400, a PEG having a molecular weight of 1470, and a PEG having a molecular weight of 6450 with respect to 20 mL of the eluent. Polyethylene oxide (PEO) having a molecular weight of 50,000, PEO having a molecular weight of 235,000, PEO having a molecular weight of 875,000, and a PEG-PEO mixture in which 10 mg of each is dissolved is used as a molecular weight standard. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, the flow rate is 0.6 mL / min and the injection amount is 100 μL.

In the case of using a quaternary ammonium salt polymer as the cationic polymer, it is preferable that the quaternary ammonium salt polymer has a flow potential of 1500 μeq / L or more from the viewpoint of more effectively generating red blood cell aggregates. , More preferably 2000 μeq / L or more, still more preferably 3000 μeq / L or more, still more preferably 4000 μeq / L or more. When the flow potential of the quaternary ammonium salt polymer is not less than these values, the electric double layer of erythrocytes can be sufficiently neutralized. The upper limit of the streaming potential is preferably 13000 μeq / L or less, more preferably 8000 μeq / L or less, and even more preferably 6000 μeq / L or less. When the flow potential of the quaternary ammonium salt polymer is below these values, the electrical repulsion between the quaternary ammonium salt polymers adsorbed on the erythrocytes can be effectively prevented. The streaming potential of the quaternary ammonium salt polymer is preferably 1500 μeq / L or more and 13000 μeq / L, more preferably 2000 μeq / L or more and 13000 μeq / L or less, and 3000 μeq / L or more and 8000 μeq / L or less. Is more preferably 4000 μeq / L or more and 6000 μeq / L or less. The flow potential of the quaternary ammonium salt polymer adjusts, for example, the molecular weight of the constituting cationic monomer itself, and the copolymerization molar ratio of the cationic monomer and the anionic monomer or nonionic monomer constituting the copolymer. Can be controlled. The streaming potential of the quaternary ammonium salt polymer can be measured using a streaming potential measuring device (PCD04) manufactured by Spectris Co., Ltd. Specific measurement conditions are as follows. First, hot melt bonding each member to a commercially available napkin is invalidated using a dryer or the like, and decomposed into members such as a top sheet, an absorber, and a back sheet. For each decomposed member, a multi-stage solvent extraction method from a nonpolar solvent to a polar solvent is performed to separate the treating agent used in each member to obtain a solution containing a single composition. The obtained solution was dried and solidified, and 1H-NMR (nuclear magnetic resonance method), IR (infrared spectroscopy), LC (liquid chromatography), GC (gas chromatography), MS (mass spectrometry), GPC (gel) Permeation chromatography) and fluorescent X-rays are combined to identify the structure of the treatment agent. With respect to a measurement sample in which 0.001 g of a treatment agent (quaternary ammonium salt polymer) to be measured is dissolved in 10 g of physiological saline, a 0.001N sodium polyethylene sulfonate aqueous solution (if the measurement sample has a negative charge) , 0.001N polydiallyldimethylammonium chloride aqueous solution) is titrated, and the titer XmL required until the potential difference between the electrodes disappears is measured. Thereafter, the streaming potential of the quaternary ammonium salt polymer is calculated by Equation 1.
Streaming potential = (X + 0.190 *) × 1000 Equation 1
(* Titration required for the physiological saline solution)

In order for the cationic polymer to be successfully adsorbed on the surface of red blood cells, it is advantageous that the cationic polymer easily interacts with sialic acid present on the surface of red blood cells. From this point of view, the present inventors proceeded with studies, and as a result, inorganic value / organic value (hereinafter referred to as “IOB (Inorganic Organic Balance) value”), which is the ratio between the inorganic value and the organic value of the substance. It was found that the degree of interaction between the sialic acid conjugate and the cationic polymer can be evaluated on the basis of. Specifically, it has been found advantageous to use a cationic polymer having an IOB value that is the same as or close to that of the sialic acid conjugate. The sialic acid conjugate is a compound in which sialic acid can exist in a living body, and examples thereof include a compound in which sialic acid is bound to the end of a glycolipid such as galactolipid.

Generally, the properties of a substance are largely controlled by various intermolecular forces between molecules, and this intermolecular force mainly consists of Van Der Wals force due to molecular mass and electric affinity due to the polarity of the molecule. If the Van Der Waals force, which has a great influence on changes in the properties of substances, and the electrical affinity can be grasped individually, the properties of unknown substances or their mixtures can be predicted from the combination. be able to. This idea is a theory well known as “organic conceptual diagram”. Conceptual diagram of organic materials is, for example, “Organic analysis” written by Kei Fujita (Kanya Shoten, Showa 5), “Organic qualitative analysis: Systematic. Pure products” by Kyoda Fujita (Kyoritsu Shuppan, 1953), Jun Fujita “Revised Chemistry Experiments—Organic Chemistry” by Kawasaki Shobo (1971), “Systematic Organic Qualitative Analysis (mixture)” by Kaoru Fujita and Masami Akatsuka (Kasama Shobo, 1974), and Yoshio Koda It is described in detail in Shiro Sato and Yoshio Honma's “New Basic Concept of Organic Conception and Application” (Sankyo Publishing, 2008). In organic conceptual diagram, regarding the physicochemical properties of substances, the degree of physical properties due to Van Der Waals force is called `` organic '', and the degree of physical properties mainly due to electrical affinity is called `` inorganic ''. The physical properties of substances are considered as a combination of “organic” and “inorganic”. Then, one carbon (C) is defined as organic 20, and the inorganic and organic values of various polar groups are defined as shown in Table 1 below. The sum of the values is obtained, and the ratio between the two is defined as the IOB value. In the present invention, the IOB value of the sialic acid conjugate described above is determined based on these organic and inorganic values, and the IOB value of the cationic polymer is determined based on the value.

Specifically, when the cationic polymer is a homopolymer, the inorganic value and the organic value are determined based on the repeating unit of the homopolymer, and the IOB value is calculated. For example, in the case of polydiallyldimethylammonium chloride, which is a cationic polymer used in Example 1 described later, an organic value of -C-x8 = 160, an inorganic value of AmmoAand NH4 salt × 1 = 400, Since it has an inorganic value of Ring (non-aromatic single ring) × 1 = 10, an organic value of −Cl × 1 = 40, and an inorganic value of 10, the total inorganic value is 400 + 10 + 10 = 420 The sum of the organic values is 160 + 40 = 200. Therefore, the IOB value is 420/200 = 2.10.

On the other hand, when the cationic polymer is a copolymer, the IOB value is calculated according to the following procedure according to the molar ratio of the monomers used for the copolymerization. That is, a copolymer is obtained from monomer A and monomer B, the organic value of monomer A is ORA, the inorganic value is INA, the organic value of monomer B is ORB, and the inorganic value is INB. Yes, when the molar ratio of monomer A / monomer B is MA / MB, the IOB value of the copolymer is calculated from the following equation.

The IOB value of the cationic polymer thus determined is preferably 0.6 or more, more preferably 1.8 or more, further preferably 2.1 or more, 2.2 It is still more preferable that it is above. Further, the IOB value of the cationic polymer is preferably 4.6 or less, more preferably 3.6 or less, and even more preferably 3.0 or less. Specifically, the IOB value of the cationic polymer is preferably 0.6 or more and 4.6 or less, more preferably 1.8 or more and 3.6 or less, and 2.1 or more and 3.6 or less. More preferably, it is 2.2 or more and 3.0 or less. The IOB value of sialic acid is 4.25 for sialic acid alone and 3.89 for sialic acid conjugate. The sialic acid conjugate is a glycolipid in which a sugar chain in a glycolipid and sialic acid are bound, and the sialic acid conjugate has a higher organic value ratio and a lower IOB value than sialic acid alone.

Where the IOB value of the cationic polymer is as described above, the organic value itself is preferably 40 or more, more preferably 100 or more, and even more preferably 130 or more. Further, it is preferably 310 or less, more preferably 250 or less, still more preferably 240 or less, and even more preferably 190 or less. For example, the organic value is preferably 40 or more and 310 or less, more preferably 40 or more and 250 or less, still more preferably 100 or more and 240 or less, and still more preferably 130 or more and 190 or less. By setting the organic value of the cationic polymer within this range, the cationic polymer is more successfully adsorbed to erythrocytes.

On the other hand, the inorganic value of the cationic polymer is preferably 70 or more, more preferably 90 or more, still more preferably 100 or more, still more preferably 120 or more, and 250 or more. It is particularly preferred that Further, it is preferably 790 or less, more preferably 750 or less, still more preferably 700 or less, still more preferably 680 or less, and particularly preferably 490 or less. For example, the inorganic value is preferably from 70 to 790, more preferably from 90 to 750, even more preferably from 90 to 680, still more preferably from 120 to 680, It is especially preferable that it is 250 or more and 490 or less. By setting the inorganic value of the cationic polymer within this range, the cationic polymer can be more effectively adsorbed to erythrocytes.

From the viewpoint of further successfully adsorbing the cationic polymer to erythrocytes, it is preferable that x and y satisfy the following formula A when the organic value of the cationic polymer is x and the inorganic value is y.
y = ax (A)
In the formula, a is preferably 0.66 or more, more preferably 0.93 or more, and even more preferably 1.96 or more. Further, a is preferably 4.56 or less, more preferably 4.19 or less, and even more preferably 3.5 or less. For example, a is preferably a number from 0.66 to 4.56, more preferably from 0.93 to 4.19, and a number from 1.96 to 3.5. Is more preferable. In particular, when the organic value and the inorganic value of the cationic polymer satisfy the above formula A, provided that the organic value and the inorganic value of the cationic polymer are within the above-mentioned ranges, the cation The functional polymer is likely to interact with the sialic acid conjugate, and the cationic polymer is more easily adsorbed to erythrocytes.

From the viewpoint of effectively producing red blood cell aggregates, the cationic polymer is preferably water-soluble. In the present invention, “water-soluble” means that 0.05 g of a 1 mm or less powdery or 0.5 mm or less film-like cationic polymer is added to a 100 mL glass beaker (5 mmΦ) and mixed with 50 mL ion-exchanged water at 25 ° C. In this case, a stirrer chip having a length of 20 mm and a width of 7 mm is inserted, and the whole amount is dissolved in water within 24 hours under stirring at 600 rpm using a magnetic stirrer HPS-100 manufactured by ASONE Co., Ltd. In the present invention, as a more preferable solubility, the total amount is preferably dissolved in water within 3 hours, and the total amount is more preferably dissolved in water within 30 minutes.

The cationic polymer preferably has a structure having a main chain and a plurality of side chains bonded thereto. In particular, the quaternary ammonium salt polymer preferably has a structure having a main chain and a plurality of side chains bonded thereto. The quaternary ammonium moiety is preferably present in the side chain. In this case, when the main chain and the side chain are bonded at one point, the flexibility of the side chain is difficult to be hindered, and the quaternary ammonium moiety present in the side chain is smoothly formed on the surface of the erythrocyte. Adsorbs. However, in the present invention, it is not hindered that the main chain and the side chain of the cationic polymer are bonded at two points or more. In the present invention, “bonded at one point” means that one of the carbon atoms constituting the main chain is single-bonded with one carbon atom located at the end of the side chain. . “Connected at two or more points” means that two or more of the carbon atoms constituting the main chain are each single-bonded with two or more carbon atoms located at the end of the side chain. Say.

When the cationic polymer has a structure having a main chain and a plurality of side chains bonded thereto, for example, a quaternary ammonium salt polymer has a structure having a main chain and a plurality of side chains bonded thereto. In this case, the number of carbon atoms in each side chain is preferably 4 or more, more preferably 5 or more, and even more preferably 6 or more. The upper limit of the carbon number is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less. For example, the number of carbon atoms in the side chain is preferably 4 or more and 10 or less, more preferably 5 or more and 9 or less, and still more preferably 6 or more and 8 or less. The carbon number of the side chain is the carbon number of the quaternary ammonium moiety (cation moiety) in the side chain, and even if carbon is contained in the anion that is the counter ion, the carbon is counted. Not included. In particular, among the carbon atoms in the side chain, the number of carbon atoms from the carbon atom bonded to the main chain to the carbon atom bonded to the quaternary nitrogen is in the above range, so that the quaternary ammonium salt. This is preferable because the steric hindrance when the polymer is adsorbed on the surface of the erythrocyte is reduced.

When the quaternary ammonium salt polymer is a quaternary ammonium salt homopolymer, examples of the homopolymer include a polymer of a vinyl monomer having a quaternary ammonium moiety or a tertiary amine moiety. . In the case of polymerizing a vinyl monomer having a tertiary amine moiety, a quaternary ammonium salt homopolymer in which the tertiary amine moiety is quaternized with an alkylating agent before and / or after polymerization. Becomes a polymer, becomes a tertiary amine neutralized salt obtained by neutralizing a tertiary amine site with an acid before and / or after polymerization, or becomes a tertiary amine having a cation in an aqueous solution after polymerization. . Examples of the alkylating agent and the acid are as described above.

In particular, the quaternary ammonium salt homopolymer preferably has a repeating unit represented by the following formula 1.

Specific examples of the quaternary ammonium salt homopolymer include polyethyleneimine. In addition, poly (2-methacryloxyethyldimethylamine quaternary salt), poly (2-methacryloxyethyltrimethylammonium salt) in which the side chain having a quaternary ammonium moiety is bonded to the main chain at one point. ), Poly (2-methacryloxyethyldimethylethylammonium methylsulfate), poly (2-acryloxyethyldimethylamine quaternary salt), poly (2-acryloxyethyltrimethylamine quaternary salt), poly (2-acryloxy) Ethyldimethylethylammonium ethyl sulfate), poly (3-dimethylaminopropylacrylamide quaternary salt), dimethylaminoethyl polymethacrylate, polyallylamine hydrochloride, cationized cellulose, polyethyleneimine, polydimethylaminopropylacrylamide, polyamidine, etc. And the like. On the other hand, examples of the homopolymer in which the side chain having a quaternary ammonium moiety is bonded to the main chain at two or more points include polydiallyldimethylammonium chloride and polydiallylamine hydrochloride.

When the quaternary ammonium salt polymer is a quaternary ammonium salt copolymer, two kinds of polymerizable monomers used for the polymerization of the quaternary ammonium salt homopolymer described above are used as the copolymer. A copolymer obtained by the above copolymerization can be used. Alternatively, as the quaternary ammonium salt copolymer, one or more polymerizable monomers used for the polymerization of the quaternary ammonium salt homopolymer described above and a polymerizable monomer having no quaternary ammonium moiety The copolymer obtained by copolymerizing using 1 or more types of bodies can be used. Furthermore, other polymerizable monomers such as —SO ₂ — may be used in addition to or in place of the vinyl polymerizable monomer. As described above, the quaternary ammonium salt copolymer may be a binary copolymer or a ternary or higher copolymer.

In particular, the quaternary ammonium salt copolymer has a repeating unit represented by the above-described formula 1 and a repeating unit represented by the following formula 2 to effectively produce an agglomerate of erythrocytes. It is preferable from the viewpoint.

Also, as the polymerizable monomer having no quaternary ammonium moiety, a cationic polymerizable monomer, an anionic polymerizable monomer, or a nonionic polymerizable monomer can be used. Among these polymerizable monomers, in particular, by using a cationic polymerizable monomer or a nonionic polymerizable monomer, charge cancellation with a quaternary ammonium moiety in a quaternary ammonium salt copolymer is achieved. Therefore, erythrocyte aggregation can be effectively generated. Examples of cationic polymerizable monomers include linear compounds having a cation-carrying nitrogen atom in the main chain, such as vinylpyridine as a cyclic compound having a cation-carrying nitrogen atom under a particular condition And a condensed compound of dicyandiamide and diethylenetriamine. Examples of the anionic polymerizable monomer include 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, acrylic acid, styrene sulfonic acid, and salts of these compounds. On the other hand, examples of nonionic polymerizable monomers include vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol monomethacrylate, ethylene glycol monoacrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl Examples include acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, and butyl acrylate. One of these cationic polymerizable monomers, anionic polymerizable monomers, or nonionic polymerizable monomers can be used, or any two or more of them can be used in combination. Can do. Also, two or more cationic polymerizable monomers can be used in combination, two or more anionic polymerizable monomers can be used in combination, or two or more nonionic polymerizable monomers can be used in combination. Can also be used. A quaternary ammonium salt copolymer copolymerized using a cationic polymerizable monomer, an anionic polymerizable monomer and / or a nonionic polymerizable monomer as a polymerizable monomer has a molecular weight of However, as described above, it is preferably 10 million or less, particularly preferably 5 million or less, and particularly preferably 3 million or less (the same applies to the quaternary ammonium salt copolymer exemplified below).

A polymerizable monomer having a functional group capable of hydrogen bonding can also be used as the polymerizable monomer having no quaternary ammonium moiety. When such a polymerizable monomer is used for copolymerization, and when erythrocytes are aggregated using a quaternary ammonium salt copolymer obtained therefrom, a hard aggregate is likely to be formed, and a highly water-absorbing polymer Absorption performance is less likely to be disturbed. Examples of the functional group capable of hydrogen bonding include —OH, —NH ₂ , —CHO, —COOH, —HF, —SH and the like. Examples of polymerizable monomers having functional groups capable of hydrogen bonding include hydroxyethyl methacrylate, vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol monomethacrylate, ethylene glycol monoacrylate, hydroxyethyl methacrylate, hydroxyethyl An acrylate etc. are mentioned. In particular, hydroxyethyl methacrylate, 2-hydroxyethyl methacrylate, hydroxyethyl acrylate, dimethylacrylamide, and the like, in which hydrogen bonds work strongly, are preferable because the adsorption state of quaternary ammonium salt polymers on erythrocytes is stabilized. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

As the polymerizable monomer having no quaternary ammonium moiety, a polymerizable monomer having a functional group capable of hydrophobic interaction can also be used. By using such a polymerizable monomer for copolymerization, the same advantageous effect as that in the case of using the polymerizable monomer having a functional group capable of hydrogen bonding described above, that is, the hardness of erythrocytes The effect that it becomes easy to produce an agglomerate is produced. Examples of functional groups capable of hydrophobic interaction include alkyl groups such as methyl, ethyl, and butyl groups, phenyl groups, alkylnaphthalene groups, and fluorinated alkyl groups. Examples of polymerizable monomers having functional groups capable of hydrophobic interaction include methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, styrene, etc. Is mentioned. In particular, methyl methacrylate, methyl acrylate, butyl methacrylate, butyl acrylate, etc., which have a strong hydrophobic interaction and do not significantly reduce the solubility of the quaternary ammonium salt polymer, are adsorbed to erythrocytes by the quaternary ammonium salt polymer. Is preferable because of stabilization. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

The molar ratio of the polymerizable monomer having a quaternary ammonium moiety and the polymerizable monomer having no quaternary ammonium moiety in the quaternary ammonium salt copolymer is the quaternary ammonium salt. It is preferable that the red blood cells are appropriately adjusted so as to be sufficiently aggregated by the ammonium salt copolymer. Or it is preferable to adjust so that the streaming potential of a quaternary ammonium salt copolymer may become the value mentioned above. Or it is preferable to adjust so that IOB of a quaternary ammonium salt copolymer may become the value mentioned above. In particular, the molar ratio of the polymerizable monomer having a quaternary ammonium moiety in the quaternary ammonium salt copolymer is preferably 10 mol% or more, more preferably 22 mol% or more, and 32 mol. % Or more, more preferably 38 mol% or more. Further, it is preferably 100 mol% or less, more preferably 80 mol% or less, still more preferably 65 mol% or less, and even more preferably 56 mol% or less. Specifically, the molar ratio of the polymerizable monomer having a quaternary ammonium moiety is preferably 10 mol% or more and 100 mol% or less, more preferably 22 mol% or more and 80 mol% or less, More preferably, it is 32 mol% or more and 65 mol% or less, and more preferably 38 mol% or more and 56 mol% or less.

When the quaternary ammonium salt polymer is a quaternary ammonium salt polycondensate, as the polycondensate, a condensate composed of one or more monomers having the quaternary ammonium moiety described above is used. Polycondensates obtained by polymerizing these condensates can be used. Specific examples include dicyandiamide / diethylenetriamine polycondensate, dimethylamine / epichlorohydrin polycondensate, and the like.

The above-described quaternary ammonium salt homopolymer and quaternary ammonium salt copolymer can be obtained by a homopolymerization method or copolymerization method of a vinyl polymerizable monomer. As the polymerization method, for example, radical polymerization, living radical polymerization, living cation polymerization, living anion polymerization, coordination polymerization, ring-opening polymerization, polycondensation and the like can be used. There are no particular limitations on the polymerization conditions, and the conditions under which a quaternary ammonium salt polymer having the desired molecular weight, streaming potential, and / or IOB value can be obtained may be appropriately selected.

The cationic polymer described in detail above is an example of the above-mentioned “preferable hemagglutinating agent 8”, and the effect thereof is Japanese Patent Application No. 2015-239286 and Japanese Patent Application Laid-Open No. 2016-107100 which is the Japanese publication of the application. And Examples 1 to 45 described in International Publication No. 2016/093233 pamphlet of the international application based on the priority claim.

In addition, as described above, the hemagglutinating agent 8 included in the napkin 1 is a composition containing a third component, for example, a solvent, a plasticizer, a fragrance, a skin care agent, etc. in addition to the polycation (cationic polymer) ( It may be given in the form of a hemagglutinating agent composition). In addition, components other than the cationic polymer that can be included in the hemagglutinating agent 8 can be used singly or in combination. As the solvent, water, a water-soluble organic solvent such as a saturated aliphatic monohydric alcohol having 1 to 4 carbon atoms, or a mixed solvent of the water-soluble organic solvent and water can be used. As the plasticizer, glycerin, polyethylene glycol, propylene glycol, ethylene glycol, 1,3-butanediol and the like can be used. As a fragrance | flavor, the fragrance | flavor which has the green herbal-like fragrance described in patent 4776407, the extract of a plant, the extract of citrus fruits, etc. can be used. As the skin care agent, plant extracts, collagen, natural moisturizing ingredients, moisturizing agents, keratin softening agents, anti-inflammatory agents and the like described in Japanese Patent No. 4084278 can be used.

The proportion of the cationic polymer in the hemagglutinating agent composition is preferably 1% by mass or more, more preferably 3% by mass or more, and further preferably 5% by mass or more. Further, it is preferably 50% by mass or less, more preferably 30% by mass or less, and still more preferably 10% by mass or less. For example, the proportion of the cationic polymer is preferably 1% by mass to 50% by mass, more preferably 3% by mass to 30% by mass, and even more preferably 5% by mass to 10% by mass. preferable. By setting the proportion of the cationic polymer in the hemagglutinating agent composition within this range, an effective amount of the cationic polymer can be imparted to the absorbent article.

As described above, in the napkin 1, as shown in FIGS. 3 and 4, the hemagglutinating agent 8 is disposed on the core wrap sheet 42 located on the skin facing surface side with respect to the absorbent core 41. As a raw material of the core wrap sheet 42, paper or a hydrophilic nonwoven fabric is preferably used. Examples of the paper include paper made by a wet papermaking method mainly composed of wood pulp fibers, such as tissue paper. Examples of the hydrophilic nonwoven fabric include air-through nonwoven fabric, point bond nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and spunbond-meltblown-spunbond (SMS) nonwoven fabric. The basis weight of the nonwoven fabric is preferably 10 to 100 g / m ² , more preferably 15 to 60 g / m ² .

The hemagglutinating agent 8 may be disposed on the excretory part facing part B of the core wrap sheet 42, but in the napkin 1, it is disposed on the entire surface of the core wrap sheet 42. Therefore, each of the skin facing surface and the non-skin facing surface of the absorbent core 41 is covered with a core wrap sheet 42 in which the hemagglutinating agent 8 is disposed on the entire surface.

The amount of hemagglutinating agent 8 contained in the core wrap sheet 42 is preferably 1 g / m ² or more, more preferably 3 g / m ² or more, and even more preferably 5 g / m ² or more. . Further, it is preferably 20 g / m ² or less, more preferably 15 g / m ² or less, and still more preferably 10 g / m ² or less. For example, the amount of hemagglutinating agent 8 in the core wrap sheet 42 is preferably 1 g / m ² or more and 20 g / m ² or less, more preferably 3 g / m ² or more and 15 g / m ² or less, and more preferably 5 g / m. it is more preferably ² or more 10 g / m ² or less. By applying the hemagglutinating agent 8 to the core wrap sheet 42 in an amount within this range, the excreted menstrual red blood cells can be effectively aggregated. It is particularly preferable that the hemagglutinating agent 8 is a cationic polymer and the amount of the cationic polymer contained in the core wrap sheet 42 is in the above range.

Whether or not the hemagglutinating agent 8 is disposed on the core wrap sheet 42 can be easily analyzed by those skilled in the art, such as a method of extracting the constituent material by exposing it to a solvent and analyzing the components. It can also be judged as follows.
Using an energy dispersive X-ray analyzer (EDX) attached to a scanning electron microscope (SEM), elemental analysis of each of the fibers and the hemagglutinating agent 8 constituting the core wrap sheet 42 is performed in advance. Next, a sample piece to be judged as to whether or not the hemagglutinating agent 8 is arranged is attached to an aluminum sample table using a double-sided carbon tape, and after performing platinum / vanadium coating as necessary, SEM observation is performed. The presence or absence of elements in the hemagglutinating agent 8 is confirmed using EDX (element analysis device) while enlarging. The measurement is performed at an acceleration voltage of 15 kV to 40 kV.

The formation material of each structural member of the napkin 1 of this embodiment mentioned above is demonstrated.
As the top sheet 2 and the back sheet 3, various kinds of materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the back sheet 3, a moisture-permeable resin film or the like can be used.

As the surface sheet 2, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. The top sheet 2 can be coated with various oil agents for improving liquid permeability, for example, various surfactants. When the topsheet 2 has a multilayer structure, the topsheet 2 includes 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 integrated in the thickness direction by a number of joints formed in part, and a portion of the first fiber layer located between the joints is convex. It is possible to use a concavo-convex sheet that protrudes and forms the concavo-convex convex portion. The convex portion of the concavo-convex sheet may have a solid structure that is entirely filled with fibers, or may have a hollow structure having a space inside. As the concavo-convex sheet in which the convex portion has a solid structure, for example, those described in Japanese Patent Application Laid-Open Nos. 2007-182626 and 2002-187228 can be used.

The surface sheet 2 may be embossed. There is no restriction | limiting in particular in an embossing pattern, According to the specific use of the napkin 1, a various pattern can be formed. For example, a so-called round emboss having a closed shape along the periphery can be formed at a position inside the periphery of the absorbent body 4. In this round embossing, it is preferable that a portion corresponding to the side edge of the absorbent body 4 has a shape that bulges outward in the width direction of the absorbent body 4. This round embossing may be composed of an assembly of discontinuous embossing patterns within a range that can be regarded as continuous when viewed as a whole.

In the napkin 1, it is preferable that an adhesive is applied and fixed between the top sheet 2 and the absorber 4 and between the absorber 4 and the back sheet 3. The adhesive can be applied using a known means such as a slot coat gun, a spiral spray gun, a spray gun, or a dot gun. In the napkin 1, the adhesive can be applied in a spiral shape using a spiral spray gun. preferable. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The application amount of the hot melt adhesive is preferably 1.5 g / m ² or more and 10 g / m ² or less.

The operational effect and estimation mechanism of the napkin 1 described above will be described.
In the napkin 1, as shown in FIG. 5, the hemagglutinating agent 8 is opposed to the excretion part of the core wrap sheet 42 located on the skin facing surface side of the absorbent core 41 having the recess 43 (the groove part 43 in the present embodiment). Part B is arranged. Therefore, during use of the napkin 1, menstrual blood is separated into red blood cells and plasma by the hemagglutinating agent 8 contained in the core wrap sheet 42, and the separated plasma is absorbed by the superabsorbent polymer of the absorbent core 41. Is done. Therefore, the amount of absorption of the absorber into the superabsorbent polymer can be increased, and the absorption rate for absorbing blood is increased. As shown in FIG. 7, a part of the aggregate 8 </ b> S formed by agglutinating two or more red blood cells by the hemagglutinating agent 8 is easily captured in the groove 43 of the absorbent core 41. When the agglomerate 8S is captured in the groove 43 of the absorbent core 41 in this manner, the recess 43 is not joined to the topsheet 2, so that wetback hardly occurs and the viscous agglomerate 8S is formed on the skin. It is difficult to touch, it is difficult to give discomfort to the wearer, and the wear feeling is improved. In particular, in the napkin 1, since the concave portion 43 is not joined to the core wrap sheet 42, the agglomerate 8S captured in the concave portion 43 is less likely to move toward the skin contact surface side, and wetback is more unlikely to occur.

Moreover, in the napkin 1, the groove part 43 of the absorptive core 41 is opened to the skin opposing surface side as shown in FIG. Therefore, the agglomerate 8S is more easily captured in the groove 43 of the absorbent core 41, and the sticky agglomerate 8S is more difficult to touch the skin, and the feeling of wearing is further improved. Furthermore, since the agglomerates 8S formed in the absorbent core 41 and the groove 43 have an effect of blocking body fluid, it is difficult to generate a wetback, and the wearing feeling is improved.

Moreover, in the napkin 1, the groove part 43 of the absorptive core 41 is extended in the groove | channel shape in the surface direction which consists of the vertical direction X and the horizontal direction Y. As shown in FIG. Therefore, the agglomerate 8S is more easily captured in the groove 43 located in the excretory part-facing portion B of the absorbent core 41, and the sticky agglomerate 8S is more difficult to touch the skin, and the wearing feeling is further improved. . Furthermore, since the agglomerate 8S has an effect of blocking body fluid that is not sufficiently absorbed, liquid return of the body fluid hardly occurs and the wet back property is excellent.

Further, in the napkin 1, a block region in which a plurality of block structures having a plurality of small absorption portions 44 surrounded by the lateral groove portions 43Y and the vertical groove portions 43X are arranged in the excretion portion facing portion B of the absorbent core 41 in the vertical direction X. BT is formed. Since the groove portion 43 is formed by reducing the basis weight of the forming material of the absorbent core 41 than the small absorbent portion 44, it is easy to bend from the groove portion 43 when wearing the absorbent article, and it is difficult to give an uncomfortable feeling. A feeling becomes good.

Moreover, in the napkin 1, the absorbent core 41 has the middle-high part 45 in the center part of the horizontal direction Y in the excretion part opposing part B, and the middle-high part 45 is formed thicker than the thickness in the peripheral region 46. Yes. Since it has such a middle-high part 45, at the time of wear of an absorbent article, a fitting property improves and the sense of security with respect to a leak improves. In particular, in the napkin 1, the groove part 43 is formed also in the middle-high part 45, it is easy to bend | curve from the groove part 43, it is hard to give an uncomfortable feeling, and it can aim at coexistence of a sense of security and a feeling of wear.

The ratio of the total area of the recesses 43 to the area of the excretion part-facing part B of the recesses 43 of the absorbent core 41 is such that the aggregate 8S is easily trapped in the recesses 43 and wetback is unlikely to occur. From the viewpoint of making the agglomerate 8S difficult to touch the skin, the area of the concave portion 43 relative to the area of the excretory part opposing part B in the excretory part opposing part B of the absorbent core 41 is viewed in plan. The total ratio is preferably 10% or more, more preferably 15% or more, and preferably 50% or less, more preferably 30% or less. Specifically, It is preferably 10% or more and 50% or less, and more preferably 15% or more and 30% or less. Here, the area of the excretory part facing part B means an area having an average length of 50 mm in the vertical direction X and a length of 40 mm in the horizontal direction Y.

The depth of the recess 43 of the absorbent core 41 is such that the agglomerate 8S is easily captured in the recess 43, wetback is unlikely to occur, and the sticky agglomerate 8S is difficult to touch the skin. 43, specifically, in the napkin 1, the depth from the skin facing surface of the absorbent core 41 is preferably 0.3 mm or more, more preferably 0.4 mm or more, and It is preferably 5 mm or less, more preferably 4 mm or less, specifically, preferably 0.3 mm or more and 5 mm or less, and more preferably 0.4 mm or more and 4 mm or less. When the depth of the concave portion 43 of the absorbent core 41 satisfies the above-described range, the aggregate 8S is easily trapped in the concave portion 43, wetback occurs, or the thick aggregate 8S is formed on the skin. Further, it becomes difficult to touch, and the napkin 1 is easy to bend starting from the groove 43 in the recess 43, so that the wearer does not feel uncomfortable and the feeling of wear becomes good. When the recessed part of the absorptive core 41 is opened to the skin facing surface side, it becomes even better. The same applies to the case where the excretion part middle-high part 45B is provided in the excretion part facing part B as in the case of the napkin 1.
In addition, in the napkin 1 of this embodiment, although the recessed part of the absorptive core 41 has an opening in the skin opposing surface side, it replaces with this and is a form which has an opening in the non-skin opposing surface side of the absorptive core 41. There may be. This is because even in such a form, there is a holding space called the recess 43 after menstrual blood comes into contact with the hemagglutinating agent, so that the aggregate can be held there.

The hemagglutinating agent 8 is disposed on the entire surface of the constituent member (the core wrap sheet 42 in the present embodiment) of the napkin 1 located on the skin facing surface side of the absorbent core 41. From the viewpoint of further achieving the above effects. The hemagglutinating agent 8 is arranged at a position overlapping the concave portion 43 of the absorbent core 41 in the constituent member of the napkin 1 (core wrap sheet 42 in the present embodiment) located on the skin facing surface side of the absorbent core 41. It is preferable that it is disposed only at a position overlapping with the recess 43.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to the napkin 1 of the said embodiment at all, and can be changed suitably.
For example, in the napkin 1, as shown in FIGS. 3 and 4, the hemagglutinating agent 8 is disposed on the core wrap sheet 42 located on the skin-facing surface side with respect to the absorbent core 41. May be arranged in the excretion part facing part B. When the hemagglutinating agent 8 is disposed in the excretory part facing part B of the absorbent core 41, the hemagglutinating agent 8 is preferably disposed in the concave part 43 in the excretion part opposing part B of the absorbent core 41.

In the napkin 1, the hemagglutinating agent 8 is disposed on the entire surface of one core wrap sheet 42, and the skin of the absorbent core 41 is formed by the one core wrap sheet 42 on which the hemagglutinating agent 8 is disposed on the entire surface. Both the opposing surface and the non-skin facing surface are covered, but the core wrap sheet 42 disposed on the skin facing surface side of the absorbent core 41 and the core wrap disposed on the non-skin facing surface side of the absorbent core 41 The absorbent core 41 may be covered with two core wrap sheets 42 made of the sheet 42. When two core wrap sheets 42 are used as described above, the hemagglutinating agent 8 is preferably disposed only on the core wrap sheet 42 disposed on the skin facing surface side of the absorbent core 41.

Moreover, the absorptive core 41 of the napkin 1 is provided with the middle-high part 45 which has the excretion part middle high part 45B and the back middle high part 45C, as shown in FIG.3 and FIG.4, and is enclosed by the horizontal groove part 43Y and the vertical groove part 43X. Although the block region BT having a plurality of small absorbing portions 44 is formed from the front portion A to the rear portion C, as shown in FIG. 8, the horizontal groove portion 43Y and the vertical groove portion 43X do not have the middle-high portion 45. A block region BT having a plurality of small absorbing portions 44 surrounded by a circle may be formed from the front portion A to the rear portion C.
Moreover, the form provided with only the excretion part middle high part 45B may be sufficient as the absorbent article of this invention, without providing the back middle high part 45C.
Moreover, the absorbent article of this invention is good also as a form provided with only the vertical groove part 43X in the excretion part middle high part 45B, or a form provided only with the horizontal groove part 43Y in the excretion part middle high part 45B. Furthermore, the excretion part middle high part 45B may have a shape that does not include a portion that bulges in the lateral direction Y.
Since the groove 43 is formed by reducing the basis weight of the forming material of the absorbent core 41 as compared with the small absorbent portion 44, the absorbent article is formed by forming the block region BT from the front portion A to the rear portion C. At the time of wearing, it is easy to bend from the groove part 43, it is hard to give a sense of incongruity, and a feeling of wearing becomes favorable.

Moreover, the absorptive core 41 of the napkin 1, as shown in FIGS. 3 and 4, is a middle-high part 45 having an excretory part middle-high part 45B having a central middle-high part 45BC and a side middle-high part 45BS, and a rear middle-high part 45C. A block region BT having a plurality of small absorbing portions 44 surrounded by the horizontal groove portion 43Y and the vertical groove portion 43X is formed from the front portion A to the rear portion C. As shown in FIG. Instead of the middle-high part 45C, the excretion part middle-high part 45B from the end on the rear part C side in the longitudinal direction X of the middle middle-high part 45BC toward the top located in the middle part of the lateral direction Y in the rear part C, You may have the back gradually decreasing middle high part 45BB formed so that the width | variety may reduce gradually.
By having such an excretion part middle high part 45B, at the time of wear of an absorptive article, fit nature improves and a sense of security to leak improves. In particular, in the napkin 1, the groove part 43 is formed also in the excretion part middle high part 45B, it is easy to bend | curve from the groove part 43, it is hard to give a sense of incongruity, and both a sense of security and a feeling of wear can be aimed at.
The absorbent core 41 may contain a deodorant and / or an antibacterial agent. There is no restriction | limiting in particular in content of the deodorizer and / or antibacterial agent in the absorptive core 41, It can be set as normal content in absorbent articles, such as a napkin.

Further, the absorbent article for absorbing menstrual blood of the present invention may be a panty liner (cage sheet) or the like in addition to a sanitary napkin.

The following absorbent article is further disclosed regarding the embodiment of the present invention described above.

<1>
Absorption having an excretion part facing part provided with a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular to the longitudinal direction, having a topsheet and an absorbent core and disposed opposite to the liquid excretion part of the wearer The absorbent article includes a hemagglutinating agent, and the absorbent core has a thin concave portion that is not joined to the topsheet at the excretory part facing part, The hemagglutinating agent is disposed in the excretory part facing part in the excretion part in the absorbent core, or in the excretion part facing part in the constituent member of the absorbent article located on the skin facing surface side of the absorbent core. Goods.

<2>
When the absorbent core is viewed in plan, the ratio of the total area of the recesses to the area of the excretory part facing part in the excretion part facing part of the absorbent core is 10% or more and 50 % Or less of the absorbent article according to <1>.
<3>
The absorbent article according to <1> or <2>, wherein the depth of the recess is 0.4 mm or more.
<4>
The absorbent article according to any one of <1> to <3>, wherein the recess is a groove extending in a groove shape.
<5>
The said recessed part is a groove part extended in groove shape, and the said absorptive core is a block which has the said comparatively low basis weight and the several small absorption part surrounded by this groove part with a comparatively high basic weight. The absorbent article according to any one of the above items <1> to <4>, wherein the structure has at least a plurality of block regions arranged in the vertical direction at the excretory part facing part.
<6>
The absorbent article according to any one of <1> to <5>, wherein the absorbent core has a middle-high portion having a thickness greater than a peripheral portion at a central portion in a lateral direction of the excretory portion-facing portion.
<7>
The hemagglutinating agent is disposed at a position overlapping the concave portion of the absorbent core and the thickness direction of the absorbent core in the constituent member of the absorbent article located on the skin-opposing surface side of the absorbent core. The absorbent article according to any one of <1> to <6>.
<8>
The absorbent article according to any one of the above items <1> to <7>, wherein the concave portion of the absorbent core is open on the skin facing surface side.

<9>
The absorbent article according to any one of <1> to <8>, wherein the absorbent core is integrally formed.
<10>
The absorbent article according to any one of <1> to <9>, further comprising a pressing groove in which the top sheet and the absorbent body are recessed.
<11>
The absorbent article according to <10>, wherein the compressed groove is in a state where its constituent fibers are heat-sealed.
<12>
In any one of the above items <1> to <11>, the absorbent core is formed with a rear middle high portion thicker than a peripheral region excluding the middle high portion at a central portion in the lateral direction in the rear portion. The absorbent article as described.

<13>
The said back middle high part is an absorbent article as described in said <12> which has a some small absorption part formed by dividing this back middle high part by the vertical groove part extended in the vertical direction of the said absorbent core.
<14>
The said back middle high part has an absorptivity as described in said <12> or <13> which has a some small absorption part formed by dividing this back middle high part by the horizontal groove part extended in the horizontal direction of the said absorptive core. Goods.
<15>
The middle-high portion has a middle middle-high portion having a vertically long shape in the longitudinal direction of the absorbent core, and a side middle-high portion that bulges laterally outward from each side edge along the longitudinal direction of the middle middle-high portion. The absorbent article according to any one of <6> to <14>.
<16>
The absorbent article according to <15>, wherein the lateral middle and high portions are divided by lateral groove portions extending in a groove shape in a lateral direction of the absorbent core.
<17>
<1> to <16, wherein the hemagglutinating agent is disposed on a skin facing surface side of the absorbent core and overlaps the concave portion of the topsheet and the thickness direction of the absorbent core. > Any one of>.
<18>
The hemagglutinating agent is disposed at a position overlapping the concave portion and the thickness direction of the absorbent core in a core wrap sheet covering the absorbent core, which is located on the skin facing surface side with respect to the absorbent core. The absorbent article according to any one of <1> to <16>.

<19>
The absorbent article according to any one of <1> to <18>, wherein the hemagglutinating agent is disposed at a position overlapping the skin facing surface side of the absorbent core in the thickness direction of the recess.
<20>
Any one of the items <1> to <19>, wherein the absorbent article includes a pair of wing portions extending laterally outward from both side portions along the vertical direction of the excretory portion facing portion. Absorbent article as described in 1.
<21>
The absorbent article according to any one of the above items <1> to <20>, further comprising a leak-proof cuff that can stand toward a wearer side on both lateral sides along the longitudinal direction of the absorbent article.
<22>
The absorbent article according to any one of <1> to <21>, wherein the absorbent article has side flap portions on both lateral sides of the vertical excretory portion-facing portion.
<23>
The absorbent article according to any one of <1> to <22>, wherein the absorbent article has a compressed groove that forms a ring-shaped circumferential groove.
<24>
The absorbent article according to any one of <1> to <23>, wherein the absorbent core contains a superabsorbent polymer.
<25>
The absorbent article according to any one of <1> to <24>, wherein a deodorant is blended in the absorbent core.
<26>
The absorbent article according to any one of <1> to <25>, wherein an antibacterial agent is blended in the absorbent core.
<27>
The absorbent article according to any one of <1> to <26>, wherein the recess has a depth of 0.4 mm or more from the skin-facing surface of the absorbent core.

Hereinafter, the absorbent article of the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.

<Example 1>
A sanitary napkin having the same basic structure as that of the sanitary napkin 1 shown in FIGS. 1 and 2 provided with the absorbent body 41 having the absorbent core 41 and the core wrap sheet 42 shown in FIG. Samples of A spunbond nonwoven fabric was used as the top sheet. A moisture-permeable resin film was used as the back sheet. As the leak-proof cuff forming sheet, a spunbond nonwoven fabric was used. The absorbent body is a mixed fiber (absorbent core) containing wood pulp fibers and a superabsorbent polymer, the thickness of the small absorbent part in the peripheral region is 3.7 mm, and the small absorbent part in the middle and high part of the excretory part. The thickness of the part is 6.5 mm, which is 176% of the thickness of the small absorption part in the peripheral area (thickness of the small absorption part in the excretion part middle / high part / thickness of the small absorption part in the peripheral part), The thickness of the small absorption part was 5.0 mm, and was 135% of the thickness of the small absorption part in the peripheral region (the thickness of the small absorption part in the rear middle / high part / the thickness of the small absorption part in the peripheral region). Moreover, the basic weight of the small absorption part of each excretion part middle high part and back middle high part was 640 g / m < ² >, and the basic weight of the small absorption part of a peripheral region was 230 g / m < ² >. Further, the basis weight of the vertical groove 43X and the lateral groove 43Y, respectively, was ^{53g / m 2, 53g / m} 2. As the core wrap sheet, a tissue paper having a basis weight of 16 g / m ² and a thickness of 0.3 mm was used, and the whole surface was coated so as to contain a hemagglutinating agent of 6 g / m ² . As the cationic polymer contained in the hemagglutinating agent, trade name Marcoat 106 manufactured by Nippon Lubrizol Co., Ltd. (polydiallyldimethylammonium chloride which is a quaternary ammonium salt homopolymer, weight average molecular weight 15,000, IOB value 2) 10 and a streaming potential of 6700 μeq / L) were used. In addition, the grooves arranged in the absorbent core are open on the skin facing surface side, the width is 1.5 mm, the distance between the horizontal grooves is 15 mm, and the distance between the vertical grooves is 14 mm. It was. Moreover, the groove part in the excretion part opposing part B part had a depth of 4.0 mm from the skin facing surface, and the groove part in the peripheral part had a depth of 0.55 mm from the skin opposing surface. By arranging the groove portion in this way, the ratio of the sum total of the groove portion to the area of the excretory portion facing portion B of the absorbent core (total area of the groove portion (mm ² ) / area of the excretory portion facing portion of the absorbent core (2000 mm ² )) Was 0.16 (16%). As the superabsorbent polymer, a general-purpose superabsorbent polymer for sanitary goods manufactured by Nippon Shokubai Co., Ltd. was used. Furthermore, the groove part was not joined to the top sheet and the core wrap sheet.

<Example 2>
A sanitary napkin having the same basic configuration as that of the sanitary napkin provided with the absorbent body 4 having the absorbent core 41 shown in FIG. 9 was produced, and this was used as a sample of Example 2. The basic configuration other than the above was the same as in Example 1. The groove portions arranged in the absorbent core were opened on the skin facing surface side, the width was 2.0 mm, the interval between the horizontal groove portions was 14 mm, and the interval between the vertical groove portions was 11 mm. Moreover, the groove part in the excretion part opposing part B was 3.0 mm in depth from the skin opposing surface, and the groove part in the peripheral part was 0.4 mm in depth from the skin opposing surface. By arranging the groove portion in this way, the ratio of the sum total of the groove portion to the area of the excretory portion facing portion B of the absorbent core (total area of the groove portion (mm ² ) / area of the excretory portion facing portion of the absorbent core (2000 mm ² )) Was 0.20 (20%).

<Example 3>
A sanitary napkin having the same basic configuration as the sanitary napkin provided with the absorbent body 4 having the absorbent core 41 shown in FIG. 8 was produced, and this was used as a sample of Example 3. The basic configuration other than the above was the same as in Example 1. The groove portions arranged in the absorbent core were opened on the skin facing surface side, the width was 2.0 mm, the interval between the lateral groove portions was 14 mm, and the interval between the vertical groove portions was 11 mm. Moreover, the groove part in the excretion part opposing part B was 3.0 mm in depth from the skin opposing surface, and the groove part in the peripheral part was 0.55 mm in depth from the skin opposing surface. By arranging the groove portion in this way, the ratio of the sum total of the groove portion to the area of the excretory portion facing portion B of the absorbent core (total area of the groove portion (mm ² ) / area of the excretory portion facing portion of the absorbent core (2000 mm ² )) Was 0.20 (20%).

<Example 4>
A sanitary napkin having the same basic configuration as the sanitary napkin provided with the absorbent body 4 having the absorbent core 41 shown in FIG. 8 was produced, and this was used as a sample of Example 4. The basic configuration other than the above was the same as in Example 1. The groove portions arranged in the absorbent core were opened on the skin facing surface side, the width was 3.0 mm, the interval between the lateral groove portions was 14 mm, and the interval between the vertical groove portions was 11 mm. Moreover, the groove part in the excretion part opposing part B was 1.0 mm in depth from the skin opposing surface, and the groove part in the peripheral part was 0.55 mm in depth from the skin opposing surface. By arranging the groove portion in this way, the ratio of the sum total of the groove portion to the area of the excretory portion facing portion B of the absorbent core (total area of the groove portion (mm ² ) / area of the excretory portion facing portion of the absorbent core (2000 mm ² )) Was 0.41 (41%).

<Example 5>
A sanitary napkin having the same basic configuration as the sanitary napkin in which the absorbent body 4 having the absorbent core 41 shown in FIG. 3 is arranged so that the opening of the groove 43 of the absorbent core 41 faces the non-skin facing surface side. This was used as a sample of Example 5. The basic configuration other than the above was the same as in Example 3. However, unlike Example 3, the groove portion arranged in the absorbent core was opened on the non-skin facing surface side.

<Comparative Example 1>
A sanitary napkin having a basic configuration similar to that of the sample produced in Example 4 except that the absorbent core has no lateral groove portion and no longitudinal groove portion and the skin facing surface and non-skin facing surface of the absorbent core are made flat. This was used as a sample of Comparative Example 1.

<Comparative Example 2>
A sanitary napkin having the same basic configuration as the sample prepared in Example 1 was prepared except that the hemagglutinating agent was not applied, and this was used as the sample of Comparative Example 2.

[Evaluation]
For the samples of Examples 1 to 5 (sanitary napkins) and the sample of comparative example 1 (sanitary napkins), the unpleasantness of the touch when worn was actually used by 5 persons for sensory evaluation. The average of the results is shown in Table 2 below.
1: Comfort 2: Slightly comfortable 3: Neither is 4: Slightly uncomfortable 5: Uncomfortable

Further, the following wetback test was performed on the sample of Example 1 (Sanitary napkin) and the sample of Comparative Example 2 (Sanitary napkin). The results are shown in Table 3 below.

<Method for evaluating wetback amount>
The sanitary napkins obtained in the examples and comparative examples were placed horizontally with the topsheet facing the surface side, and a cylindrical acrylic plate with an inlet having a diameter of 1 cm was placed on the bottom, and simulated blood from the inlet 6 g was injected, and the state was maintained for 1 minute after the injection. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercially available tissue paper) having a length of 6 cm × width of 9.5 cm and a basis weight of 13 g / m ² were placed on the surface of the top sheet. Further, a weight was placed thereon so that the pressure was 20 × 98 Pa (20 gf / cm ² ), and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, and the weight of the absorbent paper after pressurization was measured. Then, by subtracting the weight of the absorbent paper before pressurization from the weight of the absorbent paper after pressurization, the weight of the simulated blood absorbed by the paper was calculated and used as the surface liquid return amount. Incidentally, the pseudo-blood, as described herein, B-type viscometer (Toki Sangyo Co., Ltd. model number TVB-10M, measurement conditions: Rotor No.19,30rpm ² 5 ℃, 60 seconds) measured by using The blood cell / plasma ratio of defibrinated horse blood (manufactured by Japan Biotest Laboratories Co., Ltd.) was prepared so that the viscosity obtained was 8 mPa · s.

As shown in Table 2, it was found that the sanitary napkins of Examples 1 to 5 did not give discomfort and were more comfortable than the sanitary napkins of Comparative Example 1. Therefore, if the sanitary napkins of Examples 1 to 5 are used, it can be expected that the wearing feeling will be good.
Moreover, as shown in Table 3, the sanitary napkin of Example 1 in which the hemagglutinating agent is arranged and the concave portion is not joined to the top sheet is the sanitary napkin of Comparative Example 2 in which the hemagglutinating agent is not arranged. Compared to the napkin, the amount of wetback is reduced, and it can be expected that the feeling of wearing will be good.

According to the absorbent article of the present invention, the absorption rate for absorbing blood is fast, the discomfort is hardly given, and the wearing feeling is good.

Claims (27)

1. Absorption having an excretion part facing part provided with a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular to the longitudinal direction, having a topsheet and an absorbent core and disposed opposite to the liquid excretion part of the wearer A sex product,
   The absorbent article comprises a hemagglutinating agent,
   The absorbent core has a thin concave portion that is not joined to the topsheet at the excretory portion facing portion,
   The hemagglutinating agent is absorbed in the excretory part facing part in the excretory part facing part in the absorbent core or in the constituent member of the absorbent article located on the skin facing surface side of the absorbent core. Sex goods.
2. The absorption according to claim 1, wherein, in the excretory part facing part of the absorbent core, the ratio of the total area of the recesses to the area of the excretory part facing part in a plan view is 10% or more and 50% or less. Sex goods.
3. The absorptive article according to claim 1 or 2 whose depth of said crevice is 0.4 mm or more.
4. The absorbent article according to any one of claims 1 to 3, wherein the recess is a groove extending in a groove shape.
5. The recess is a groove extending in a groove shape,
   The absorbent core has a block structure having a relatively low basis weight of the groove portion and a plurality of small absorbent portions having a relatively high basis weight and surrounded by the groove portion, at least in the excretory portion facing portion in the longitudinal direction. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article has a plurality of block regions.
6. The absorbent article according to any one of claims 1 to 5, wherein the absorbent core has a middle-high portion thicker than a peripheral region at a central portion in a lateral direction of the excretory portion-facing portion.
7. The hemagglutinating agent is disposed at a position overlapping the concave portion of the absorbent core and the thickness direction of the absorbent core in the constituent member of the absorbent article located on the skin-opposing surface side of the absorbent core. The absorbent article according to any one of claims 1 to 6.
8. The absorbent article according to any one of claims 1 to 7, wherein the concave portion of the absorbent core is open on a skin facing surface side.
9. The absorbent article according to any one of claims 1 to 8, wherein the absorbent core is integrally molded.
10. The absorbent article has an absorbent body provided with the absorbent core,
    The absorbent article according to any one of claims 1 to 9, further comprising a pressing groove in which the topsheet and the absorbent body are integrally recessed.
11. The absorbent article according to claim 10, wherein the compressed groove is in a state where its constituent fibers are heat-sealed.
12. The absorptive core has a middle-high portion thicker than its peripheral region at the central portion in the lateral direction in the excretory portion facing portion,
    The absorbent core according to any one of claims 1 to 11, wherein the absorbent core has a rear middle-high portion thicker than a peripheral region excluding the middle-high portion at a central portion in the lateral direction at a rear portion. Sex goods.
13. The absorbent article according to claim 12, wherein the rear middle-high part has a plurality of small absorbent parts formed by dividing the rear middle-high part by a longitudinal groove part extending in a longitudinal direction of the absorbent core.
14. The absorbent article according to claim 12 or 13, wherein the rear middle-high part has a plurality of small absorbent parts formed by dividing the rear middle-high part by a lateral groove part extending in a lateral direction of the absorbent core.
15. The middle-high portion has a middle middle-high portion having a vertically long shape in the longitudinal direction of the absorbent core, and a side middle-high portion that bulges laterally outward from each side edge along the longitudinal direction of the middle middle-high portion. The absorbent article according to any one of claims 6 to 14.
16. The absorbent article according to claim 15, wherein the lateral middle and high portions are divided by lateral groove portions extending in a groove shape in a lateral direction of the absorbent core.
17. The hemagglutinating agent is disposed at a position on the skin-facing surface side of the absorbent core and overlapping the concave portion of the topsheet and the thickness direction of the absorbent core. The absorbent article of Claim 1.
18. The hemagglutinating agent is disposed at a position overlapping the concave portion and the thickness direction of the absorbent core in a core wrap sheet covering the absorbent core, which is located on the skin facing surface side with respect to the absorbent core. The absorbent article according to any one of claims 1 to 16.
19. The absorbent article according to any one of claims 1 to 18, wherein the hemagglutinating agent is arranged at a position overlapping the thickness direction of the concave portion on the skin facing surface side of the absorbent core.
20. The absorbent article according to any one of claims 1 to 19, wherein the absorbent article includes a pair of wing portions extending laterally outward from both side portions along the longitudinal direction of the excretory portion facing portion. Absorbent articles.
21. The absorbent article according to any one of claims 1 to 20, further comprising a leak-proof cuff that can stand toward a wearer on both sides of the absorbent article along the longitudinal direction.
22. The absorbent article according to any one of claims 1 to 21, wherein the absorbent article has side flap portions on both lateral sides of the vertical excretory portion-facing portion.
23. The absorbent article according to any one of claims 1 to 22, wherein the absorbent article has a compressed groove that forms a ring-shaped circumferential groove.
24. The absorbent article according to any one of claims 1 to 23, wherein the absorbent core contains a superabsorbent polymer.
25. The absorbent article according to any one of claims 1 to 24, wherein a deodorant is blended in the absorbent core.
26. The absorbent article according to any one of claims 1 to 25, wherein an antibacterial agent is blended in the absorbent core.
27. The absorbent article according to any one of claims 1 to 26, wherein the hemagglutinating agent is a water-soluble cationic polymer.

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