TW202333637A - absorbent article - Google Patents

Abstract

This absorbent article comprises a front surface sheet 1, a back surface sheet 2, and an absorber 3 that is disposed between the two sheets and that includes a fibrous material-containing absorbent sheet as a constituent member. The absorbent article is configured to have a vertical direction Y that corresponds to the front-back direction of a wearer and a lateral direction X that is orthogonal to the vertical direction Y. The absorber 3 has a laminated structure which includes, at least the central part of the absorber 3 in the lateral direction X, a front surface-side absorbent sheet 31 disposed on the skin-facing surface side 10A, a rear surface-side absorbent sheet 32 disposed on the non-skin-facing surface side 10B, and a central absorption part 33 that is disposed between those two sheets. The central absorption part 33 contains a water-soluble antibacterial agent, a porous material, and a polyphenolic compound.

Description

absorbent articles

The present invention relates to absorbent articles such as menstrual sanitary napkins, incontinence pads, and diapers.

Excretion fluids such as menstrual blood or urine are odorless immediately after being excreted. They are decomposed over time by bacteria, producing substances that cause odor. There are many substances that cause odor, including trimethylamine, which easily emits an unpleasant odor. In this regard, technology for containing an antibacterial agent in absorbent articles such as menstrual napkins has been known (for example, Patent Documents 1 to 4). [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2019-162401 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-110443 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-158509 [Patent Document 4] Japanese Patent Application Publication No. 2016-067749

The present invention provides an absorbent article including a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets. The absorbent body includes an absorbent sheet containing fiber material as a structural member, and the absorbent article has a longitudinal direction corresponding to the wearer's front and rear direction and a transverse direction orthogonal to the longitudinal direction; and the absorbent body is located on the above-mentioned side of the absorbent body. At least the central part in the transverse direction has a laminated structure, and the laminated structure includes a front-side absorbent sheet located on the skin-facing side, a back-side absorbing sheet located on the non-skin-facing side, and a layer between these two sheets. The central absorption part contains a water-soluble antibacterial agent, a porous material and a polyphenol compound in the central absorption part.

The above and other features and advantages of the present invention will become clearer from the following description with appropriate reference to the accompanying drawings.

The present invention relates to an absorbent article that can suppress irritation to the skin and continuously suppress bad odor.

The antibacterial effect produced by antibacterial agents in absorbent articles cannot be visually recognized, so it can generally be felt by reducing odor and reducing skin itching and inflammation caused by bacteria. However, in general, antibacterial agents are not effective against all bacteria. In addition, if the content of antibacterial agents is excessively increased to cope with long-term use of absorbent articles, the antibacterial agents may cause irritation to the skin due to the reflux of excreted fluid to the skin side. Therefore, there is room for further improvement in absorbent articles from the viewpoint of reducing odor.

In contrast, the absorbent article of the present invention can suppress irritation to the skin and continuously suppress bad odor.

Hereinafter, a menstrual sanitary napkin (hereinafter also referred to as a sanitary napkin) 10 as a preferred embodiment of the absorbent article of the present invention will be described with reference to the drawings. In the present invention, unless otherwise specified in advance, the side in contact with the human body is called the skin-opposing surface side, and the opposite side is called the non-skin-opposing surface side. These are terms used to express the relative positional relationship between the components of an absorbent article, even for components that do not have surfaces that come into contact with the human body. In addition, the direction located on the front side of the human body when worn is called the front, and the direction located on the back side is called the rear. The normal direction of the front or back surface of the absorbent article is called the thickness direction.

As shown in FIGS. 1 and 2 , the sanitary napkin 10 includes a liquid-permeable front sheet 1 disposed on the skin-facing side 10A, a back sheet 2 disposed on the non-skin-facing side 10B, and these two sheets. The liquid-retaining absorber 3 between materials 1 and 2. The front sheet 1 has liquid permeability for sending excretion liquid to the absorber 3, and the back sheet 2 has leakage resistance for excretion liquid. The front sheet 1 and the back sheet 2 have a size that covers both surfaces of the absorber 3 and extends outside the outer edge of the absorber 3 . Furthermore, the above-mentioned skin-facing surface side 10A and non-skin-facing surface side 10B are not only used to represent the relative arrangement positions of the sanitary napkin 10 in the thickness direction, but also are used to represent the structural members of the sanitary napkin 10 in the thickness direction. A term used to describe relative placement.

In this embodiment, a liquid-permeable second sheet 4 having a narrower width than the absorber 3 is provided between the top sheet 1 and the absorber 3 . The second sheet 4 has the function of spreading the excretion liquid that has passed through the front sheet 1 in the plane direction, thereby expanding the absorption area of the skin surface side of the absorber 3 . Furthermore, side leakage-proof sheets 5 are laminated on both sides of the skin-contacting side of the front sheet 1 . The side leakage-proof sheets 5 and the back sheet 2 extend outward in the transverse direction X of the absorber 3 to form wings 6 serving as members for fixing to clothing or the like. On the non-skin contacting side of the wing portion 6 and the back sheet 2, there is an adhesive portion (not shown) for fixing the sanitary napkin 10 to clothing. In the laminated structure of this sheet, the outer peripheral edge of the sanitary napkin 10 is joined to the outer peripheral sealing portion 9 without the absorber 3 interposed therebetween.

The sanitary napkin 10 may include other structural members, and may also be in a form without the second sheet 4, the wings 6, and the side leakage-proof sheets 5. Furthermore, it may also have leakage prevention grooves compressed from the front sheet 1 to the absorber 3, a plurality of embossings on the front sheet 1, etc. In addition, the side leakage-proof sheet 5 may be joined to the front sheet 1 while leaving free ends on the inner side of both sides of the front sheet 1, or an elastic member may be disposed on the free ends. etc. to form leak-proof flanging.

The sanitary napkin 10 has an elongated shape when viewed from above, that is, it has a longitudinal direction Y corresponding to the front-to-back direction of the wearer, and a transverse direction X orthogonal to the longitudinal direction. In addition, the front sheet 1, the back sheet 2, and the absorbent body 3 have a vertically long shape like the sanitary napkin 10. The longitudinal direction Y corresponds to the direction connecting the wearer's abdomen, crotch and back when the sanitary napkin 10 is worn. The horizontal X corresponds to the direction of the wearer's crotch connecting the left and right feet. In this specification, the longitudinal direction Y and the transverse direction X represent the directions of the sanitary napkin 10 when viewed from above, and simultaneously represent the directions of the front sheet 1 , the back sheet 2 and the absorbent body 3 when viewed from above.

The sanitary napkin 10 has a middle portion C in the longitudinal direction Y, and the middle portion C includes a portion facing the wearer's excretion point. Furthermore, in the longitudinal direction Y, it has a front part F on the abdominal side located forward and forward of the middle part C, and a rear part R on the buttocks side arranged behind the middle part C. Moreover, in the middle part C, there is a excretion part facing area (also called a liquid receiving area) C1 in the center part of the transverse direction X which is opposite to the above-mentioned excretion point and directly receives the excretion liquid. The "central part" of the lateral direction X where the excretion part facing area C1 exists is as shown in Figure 1, and refers to a range of a specific width extending left and right from the center line L of the lateral direction X, and refers to two sides of the lateral direction X of the absorber 3. The part of the range further inside the end edge. Specifically, it refers to the area extending to the left and right from the center line L of the transverse direction X of the sanitary napkin 10 and the portion of the range of 40% to 60% of the width of the absorbent body 3 . In addition, the middle part C, the excretion part facing area C1, the front part F, and the rear part R represent the divisions in the sanitary napkin 10, and also represent the corresponding front sheet 1, absorber 3, and back sheet 2. division.

The dividing positions of the middle portion C, the front portion F, and the rear portion R can be appropriately set according to the length of the absorbent article, and the length of the absorbent article is set according to the purpose of use and the like. In the case where there are wings that are bent and fixed at the crotch portion of the shorts, the area along the longitudinal direction of the wings becomes the middle portion C. The sanitary napkin 10 of this embodiment is an example of a shape set for daily use. The longitudinal length is divided into three equal parts, and a front part F, a middle part C, and a rear part R are set. It is a daily use sanitary napkin without wings. In this case, the middle part follows this setting. Regardless of the shape of the sanitary napkin 10 , generally speaking, the middle portion C can be set to a position at a fixed distance from the front portion F. Furthermore, regarding diapers for adults or infants, or urine-absorbent pads, etc., the longitudinal length is divided into three equal parts to set the front part F, the middle part C, and the rear part R.

Next, the absorber 3 will be described.

The absorbent body 3 contains an absorbent sheet containing a fiber material as a constituent member. The fiber material has hydrophilicity capable of absorbing excretion fluid, and examples thereof include hydrophilic fibers that are hydrophilic fibers that are hydrophilic in nature. Particularly preferred are those that are hydrophilic and have water retention properties. Preferred examples of the hydrophilic fibers include natural fibers, cellulose-based regenerated fibers, and semi-synthetic fibers. Examples of hydrophilic fibers having water retention properties include cellulose-based fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. Cellulosic fibers can be used individually by one type or in combination of two or more types. Examples of raw material pulps for cellulosic fibers include wood pulps such as coniferous tree kraft pulp and broadleaf tree kraft pulp, and non-wood pulps such as cotton pulp and grass pulp. As cellulose-based fibers, cross-linked cellulose fibers (pulp fibers) obtained by intra- or intermolecular cross-linking of cellulose with a suitable cross-linking agent, or fibers in which the crystallinity of cellulose is increased can also be used. Regenerated cellulose fibers such as nylon fiber, etc. The absorbent sheet containing the above fiber material may contain cellulose fibers and synthetic fibers, such as thermoplastic fibers, or may contain synthetic fibers, such as thermoplastic fibers, instead of the cellulose fibers. As the thermoplastic fiber, a single fiber formed using a single synthetic resin such as polyethylene, polypropylene, polyester, polyurethane, or a composite of two or more of these synthetic resins may also be used. As the composite fiber, for example, core-sheath type, side-by-side type, etc. composite fibers formed by using two or more kinds of synthetic resins can be used. These synthetic fibers are preferably hydrophilized as described above.

The absorbent sheet may be a sheet composed only of the above-mentioned fiber material, or may be a sheet in which a highly absorbent polymer material is sandwiched and fixed between two fiber layers containing the above-mentioned fiber material. The super absorbent polymer material mentioned here is a surface cross-linked polymer material called SAP (Super Absorbent Polymer, super absorbent polymer) (the same below). When forming an absorbent sheet including a high-absorbent polymer material, the high-absorbent polymer material can be integrated by utilizing the adhesive force exhibited by moisture or by adding additional adhesives such as adhesives or adhesive fibers. For example, those described in paragraphs [0019] to [0127] of Japanese Patent No. 2963647, and those described in paragraphs [0020] to [0075] of Japanese Patent No. 2955223 can be cited. Its production can be carried out by various methods commonly used, and any method of wet method or dry method can be used. Since the thickness of the absorbent sheet is kept below 3.0 mm and the highly absorbent polymer material is dispersed in the plane direction of the sheet, it is difficult to cause gel clogging and has high absorbency. For example, those described in paragraphs [0019] to [0131] of Japanese Patent Application Laid-Open No. 8-246395 can be cited.

As the super-absorbent polymer material, particulate ones are generally used, but fibrous ones may also be used. When a particulate super-absorbent polymer is used, its shape may be any of spherical, block-like, bag-like or irregular. As the highly absorbent polymer material, generally speaking, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid can be used. Examples thereof include polyacrylic acid and its salts, and polymethacrylic acid and its salts. As the polyacrylate or polymethacrylate, sodium salt is preferably used. In addition, maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(methane A copolymer obtained by copolymerizing comonomers such as acryloethanesulfonic acid, 2-hydroxyethyl (meth)acrylate or styrenesulfonic acid with acrylic acid or methacrylic acid.

As shown in FIG. 2 , the absorbent body 3 has a front side absorbent sheet 31 and a back side absorbent sheet 32 as the absorbent sheets. The front side absorbent sheet 31 and the back side absorbent sheet 32 have a length from the middle part C to the front part F and the rear part R, and form the outer shape of the absorber 3 . The front side absorbent sheet 31 and the back side absorbent sheet 32 may be formed by folding one absorbent sheet 3A as shown in FIG. 2 , or may be formed from different absorbent sheets. In the aspect shown in FIG. 2 , the part of the absorbent sheet 3A disposed on the skin-facing side 10A of the absorbent body 3 becomes the front-side absorbent sheet 31 , and is disposed on the non-skin-facing surface of the absorbing body 3 The part of side 10B becomes the back side absorbent sheet 32. In addition, the absorbent sheet 3A may be folded in various ways. In the aspect shown in FIG. 2 , one absorbent sheet 3A is extended in the transverse direction X from the skin-facing side 10A and wound to the non-skin-facing side 10B, and the absorbent sheet 3A is Both ends of the transverse direction X are overlapped and joined to the non-skin-opposing surface side 10B. However, the folding mode is not limited to this. For example, both ends of one absorbent sheet 3A in the transverse direction X may be overlapped and joined to the sides of the absorbent body 3 in the transverse direction X, or they may be overlapped and joined to the skin-facing side 10A. From the viewpoint of improving the absorbability of excretion fluid and reducing the opportunity for the following water-soluble antibacterial agents, porous materials, and polyphenol compounds to come into contact with the skin, it is preferable to use one absorbent sheet as shown in Figure 2 A state in which both ends of the sheet 3A in the transverse direction X are overlapped and joined to the non-skin facing side 10B.

The absorbent body 3 has a laminated structure in at least the central portion in the transverse direction , and the central absorbing portion 33 located between the two sheets. The central absorbent portion 33 is located in a region including the excretion portion facing region C1. The preferred aspect of the central absorbing portion 33 will be described below.

The sanitary napkin 10 contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound in the central absorbent portion 33 . That is, the above-mentioned water-soluble antibacterial agent, porous material, and polyphenol compound are contained in the central absorbent portion 33 inside the laminated structure of the absorbent body 3 and corresponding to the excretion portion facing area C1 and absorbing the most excretion fluid. In the central absorbing part 33, the water-soluble antibacterial agent, the porous material and the polyphenol compound are preferably mixed and dispersed. The water-soluble antibacterial agent, the porous material, and the polyphenol compound interact with excretion fluids such as menstrual blood (hereinafter referred to as excretion fluid) in the sanitary napkin 10 through the central absorbent portion 33 located in the area C1 facing the excretion portion. Maximum exposure opportunities. Furthermore, due to the laminated structure of the absorbent body 3, migration of water-soluble antibacterial agents, porous materials, and polyphenol compounds from the absorbent body 3 to the outside is suppressed. In particular, the laminated structure of the absorber 3 increases the distance between the front sheet and the central absorbent part 33. Therefore, the return of excretion liquid from the central absorbent part 33 to the front sheet 1 is suppressed and is dissolved in the excretion liquid. The water-soluble antibacterial agent in the film is difficult to migrate to the front sheet 1. As a result, the water-soluble antibacterial agent, porous material and polyphenol compound can stably come into contact with excretion fluid for a long time and effectively exhibit antibacterial and deodorizing effects. In addition, through the antibacterial effect of the central absorption part 33, the chance of contact between bacteria and the skin is reduced, thereby inhibiting irritation to the skin. Furthermore, since the migration of the water-soluble antibacterial agent from the inside to the outside of the laminated structure of the absorber 3 is suppressed as described above, irritation of the skin by the water-soluble antibacterial agent is suppressed. In particular, the skin-facing side 10A of the central absorbent portion 33 is covered with another member, the front-side absorbent sheet 31, with an interlayer gap. Therefore, compared with the case where the thickness of the absorbent body 3 is only increased, the water-soluble fiber is less susceptible to dissolution. The antibacterial agent has a higher inhibitory effect on exudation of excretion to the side 10A opposite the skin. In addition, since water-soluble antibacterial agents are not only water-soluble antibacterial agents, but water-soluble antibacterial agents, porous materials and polyphenol compounds cooperate to exhibit high antibacterial and deodorizing effects, even if the amount of water-soluble antibacterial agents is relatively small, the odor will be reduced. The inhibitory effect is also improved.

The synergistic effect of the above-mentioned water-soluble antibacterial agent, porous material and polyphenol compound is explained below. First, since the water-soluble antibacterial agent is water-soluble, it can be dissolved in the excretion liquid when the excretion liquid penetrates into the central absorbent portion 33 . The water-soluble antibacterial agent dissolves and moves within the central absorbent portion 33 from the initial stage of excretion, thereby exerting an antibacterial effect and inhibiting the growth of bacteria at various locations in the central absorbent portion 33 where excretion fluid exists. Thereby, the water-soluble antibacterial agent can, for example, inhibit the decomposition of proteins in menstrual blood caused by bacteria, thereby inhibiting the production of odor-causing substances. On the other hand, generally speaking, when the water-soluble antibacterial agent is excessively contained in order to enhance the effect of the water-soluble antibacterial agent, when a strong external force is exerted on the sanitary napkin 10 due to the wearer's movements, etc., the water-soluble antibacterial agent The risk of part of the agent migrating from the central absorption part 33 to the components on the skin side increases, thereby increasing the risk of skin irritation. In order to solve this problem, in the present invention, the central absorbent portion 33 contains polyphenol. Polyphenol compounds easily react chemically with odor-causing substances such as trimethylamine, which can turn the odor-causing substances into non-volatile substances and deodorize. Therefore, polyphenolic compounds can deodorize through chemical binding without re-releasing the odor-causing substances that would be re-released after being adsorbed by porous materials. In addition, in the present invention, the central absorbent portion 33 contains a porous material. The porous material has the function of providing a reaction field so that polyphenol compounds can react more easily. Generally speaking, the evaporation speed of odor-causing substances is often faster than the reaction speed between odor-causing substances and polyphenol compounds. In this case, the polyphenol compounds may not be able to fully exert their deodorizing function. Therefore, in the present invention, the porous material temporarily captures the odor-causing substance, and the odor-causing substance gradually released from there reacts with the polyphenol compound, thereby allowing the two to react more efficiently. Porous materials are generally poorly soluble in water. On the other hand, polyphenol compounds are water-soluble. Therefore, after absorption of excretion fluid, the porous material is surrounded by the polyphenol compounds. Furthermore, when a hydroxyl group or the like is introduced into the pores of a porous material and the liquid is hydrophilic, it is preferable because the polyphenol compound can penetrate into the pores and react with the odor-causing substances before they evaporate. In this way, porous materials and polyphenol compounds can exert strong deodorizing performance by making up for each other's weaknesses. By combining the above three components in the central absorbent part 33, a water-soluble antibacterial agent is used to inhibit the growth of bacteria that cause odor in the initial stage of excretion, thereby cutting off the source of the odor and using it in the initial stage of decomposition of excretion fluid. Porous materials physically adsorb bacteria that cannot be completely captured to deodorize them, and use polyphenol compounds to chemically non-volatileize odor-causing substances that are released over time. In this way, the three-stage structure can be used to suppress odor components in various aspects and comprehensively, and the suppression can be sustained in the central absorption part 33 which is the internal structure of the absorber 3.

Thereby, the irritation of the skin by the sanitary napkin 10 can be suppressed and the bad odor can be continuously suppressed.

In the sanitary napkin 10, from the viewpoint of further improving the above-mentioned sustained odor suppressing effect, it is preferable that the entire area of the central absorbent portion 33 in plan view contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound. When the above three components are arranged over the entire area of the central absorbent portion 33 in the direction parallel to the sheet surface, the included positions in the thickness direction of the central absorbent portion 33 may also vary depending on the position. The preferred containing position in the thickness direction will be described below. Thereby, when the sanitary napkin 10 repeatedly receives excretion liquid due to long-term use, etc., even if the excretion liquid spreads in the central absorbent part 33, the contact opportunities between the above three components and the excretion liquid can be increased, so that the sanitary napkin 10 can be used more frequently. Perform the above functions on a large scale.

Moreover, in the sanitary napkin 10, from the viewpoint of more effectively suppressing irritation of the skin by the water-soluble antibacterial agent, it is preferable that the front side absorbent sheet 31 does not contain the water-soluble antibacterial agent.

The combination of a water-soluble antibacterial agent, a porous material and a polyphenol compound as described above can achieve a higher odor-inhibiting effect compared to the case of containing a water-soluble antibacterial agent alone, even if the content of the water-soluble antibacterial agent is reduced. Therefore, from the perspective of further reducing irritation to the skin, the basis weight of the water-soluble antibacterial agent contained in the central absorption part 33 is preferably 5.0 g/m ² or less, more preferably 3.0 g/m ² or less, and further preferably 3.0 g/m 2 or less. Preferably, it is less than 1.0 g/ ^m2 . In addition, from the viewpoint of maintaining the antibacterial effect, the basis weight of the water-soluble antibacterial agent contained in the central absorbent part 33 is preferably 0.003 g/m ² or more, more preferably 0.005 g/m ² or more, and further preferably 0.010 g/m ² or more. From the viewpoint of further improving the adsorption effect on odor-causing substances, the basis weight of the porous material in the central absorbent portion 33 is preferably 0.5 g/m ² or more, and more preferably 1.0 g/m ² or more. In addition, from the viewpoint of maintaining the absorptive performance of the central absorbent part 33, the basis weight of the porous material in the central absorbent part 33 is preferably 10 g/m ² or less, more preferably 5.0 g/m ² or less. From the viewpoint of further improving the chemical binding effect against odor-causing substances, the basis weight of the polyphenol compound contained in the central absorbing part 33 is preferably 0.001 g/m ² or more, more preferably 0.003 g/m ² or more. , and more preferably 0.005 g/m ² or more. Furthermore, from the viewpoint of maintaining the absorption performance of the absorbent body 3, the basis weight of the polyphenol compound contained in the central absorbent part 33 is preferably 5.0 g/m ² or less, more preferably 3.0 g/m ² or less, and still more preferably 5.0 g/m 2 or less. Preferably, it is less than 1.0 g/ ^m2 .

In addition, from the viewpoint of more effectively suppressing the irritation of the water-soluble antibacterial agent to the skin and more effectively expressing the above-mentioned effects exerted by the combination of the water-soluble antibacterial agent, the porous material and the polyphenol compound, the central absorbent portion 33 The ratio of the basis weight of the water-soluble antibacterial agent to the basis weight of the water-soluble antibacterial agent in the sanitary napkin 10 is preferably 80% or more, more preferably 90% or more, and still more preferably 100%.

The "water solubility" of water-soluble antibacterial agents refers to a solubility of more than 2 g in 1 L of ion-exchange water at 25°C. From the viewpoint of improving the solubility and mobility of the water-soluble antibacterial agent in excreta, the above-mentioned solubility is preferably 3 g or more, and more preferably 10 g or more. The above solubility can be measured by the following method. Put 1 L of ion-exchange water at 25°C into a 2 L beaker and add the fully dried measurement object (water-soluble antibacterial agent). Then, a stirring blade with a length of 20 mm and a width of 7 mm (for example, HPS-100 manufactured by AS ONE Co., Ltd.) is installed and stirred at 600 rpm using a magnetic stirrer. The solubility of the antibacterial agent in water at 25°C was defined as the amount that was added before it could not be dissolved after stirring for 1 hour.

As the water-soluble antibacterial agent, various ones having solubility and mobility in excretion fluid and exerting an antibacterial effect can be used. Examples include antibacterial metals, antibacterial metal supports, organic antibacterial agents, and the like. The fact that the antibacterial metal carrier is water-soluble means that even if the carrier carrying the antibacterial metal is poorly soluble in water, the supported metal is also water-soluble. Specific examples thereof include silver-supported silica and silver-supported zeolite. The total carbon chain number of organic antibacterial agents is relatively small or medium (carbon number is 4 to 20). It is better to choose a cationic structure with a water-soluble counterion or a non-ionic structure as the water-soluble one. Antibacterial agents. Specific examples thereof include quaternary ammonium salts having the above structures and alkylpyridinium chloride. Among them, quaternary ammonium salts are preferred. Among the quaternary ammonium salts, those having a higher affinity with bacteria are preferably bensonine chloride, chloricamine, and cetylpyridinium chloride having the above-mentioned structures.

As the porous material, any material commonly used in such articles can be used as long as it has pores capable of trapping odor-causing substances, and porous particles are preferred. Among them, those with deodorizing properties (hereinafter referred to as porous deodorants) are preferable because a certain deodorizing effect can be expected at a stage before the odor-causing substances react with polyphenols. Porous deodorizing particles are preferred. Moreover, it is preferable that the porous material supports antimicrobial metal. Porous particles as porous materials refer to particles that have a plurality of pores at least on the surface of the particles and are capable of capturing, adsorbing, and/or incorporating volatile odor-causing substances into their pores. Examples of the material of the porous particles include organic compounds, inorganic compounds, polymers thereof, or combinations thereof. Specific examples thereof include porous methacrylic polymers, acrylic polymers such as porous acrylic polymers, porous divinylbenzene polymers, aromatic polymers such as porous pyridine copolymers, and copolymers thereof. and other synthetic porous polymers; natural porous polymers such as chitin and chitosan; zinc oxide, activated carbon, silicon oxide, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds , high silica zeolite (hydrophobic zeolite), sepiolite, cannonite, zeolite, and metal-supported porous materials such as inorganic porous materials such as hydrated zirconia, etc., it is preferable to contain metal-supported porous materials selected from the group consisting of them. At least one of them. Odor components derived from excretion fluids such as urine and menstrual blood that are targeted for deodorization are mixed with multiple types of ammonia, amines, fatty acids, hydrogen sulfide, and mercaptans. Generally speaking, the molecular size of these odor components is 1 nm or more, so by using porous particles with an average pore diameter of 2 nm or more as a deodorant, multiple odor components can be effectively adsorbed.

The average pore size of a porous material refers to the peak value of the pore size in the pore size distribution. From the viewpoint of the adsorption effect of odor and the fact that aroma components evaporated from the following perfumes are not easily adsorbed and the aroma is not easily deteriorated or reduced, the peak value of the pore size of the porous particles is preferably smaller than the size of the aroma components, preferably 0.1 μm or less, more preferably 0.04 μm or less, and more preferably 0.005 μm or more. The peak value of the pore diameter of the porous particles is measured by the following method.

＜Measurement method of peak pore diameter of porous materials＞ The peak value of the pore diameter of the porous material can be measured by a multi-point method using liquid nitrogen using a pore distribution measuring device (manufactured by Bayer Japan Co., Ltd., trade name: BELSORP mini II). Let the peak in the pore distribution be the peak of the pore diameter. The measurement sample was subjected to pretreatment by heating at 110°C for 1 hour.

As the polyphenol compound, various substances that are less irritating to the skin and can convert odor-causing substances into non-volatile substances through chemical binding can be used. The polyphenol compound may be water-soluble as defined in terms of solubility as described above, or may be poorly water-soluble which does not meet the water solubility. It is preferable that the polyphenol compound has a certain degree of solubility although its solubility is lower than that of the above-mentioned water-soluble antibacterial agent. Thereby, the polyphenol compound can move to various positions in the central absorbing part 33 to a degree that does not hinder the mobility of the water-soluble antibacterial agent, thereby non-volatilizing the odor-causing substances.

As such polyphenol compounds, from the viewpoint of reducing irritation to the skin, natural ingredients are preferred. For example, the polyphenol compound is preferably a component contained in a plant extract. Specific examples of polyphenol compounds include catechins in tea leaves, polyphenols extracted from sugar cane, polyphenols extracted from cocoa, chlorogenic acid, anthocyanins, ferulic acid, and the like. Among them, catechins in tea leaves and polyphenols extracted from sugar cane, which have strong chemical binding effects, are preferred, and catechins in tea leaves are more preferred.

Next, a preferred aspect of the central absorbent portion 33 will be described. The central absorbing part 33 is arranged in the central part in the transverse direction X and includes the excretion part facing area C1. In FIG. 2 , the central absorbent portion 33 is located in a range corresponding to the excretion portion facing area C1 in the transverse direction X. However, it is not limited to the aspect shown in FIG. 2 . The central absorbent portion 33 may also be disposed in the excretion portion within a range in which the front side absorbent sheet 31 and the back side absorbent sheet 32 are laminated in the thickness direction in the transverse direction X. The area opposite to area C1 is wide. From the perspective of increasing the opportunity for the above three components to come into contact with excretion fluid and exhibiting stable antibacterial and deodorizing effects over a long period of time, the width W2 of the central absorbent portion 33 in the transverse direction X is larger than that of the front side absorbent sheet 31 and The ratio (W2/W1) of the width W1 of the back absorbent sheet 32 in the transverse direction X is preferably 0.3 or more, more preferably 0.4 or more. Moreover, from the viewpoint of improving the inhibitory effect on the migration of the above three components from the absorber 3 to the outside, the above ratio (W2/W1) is preferably 0.7 or less, more preferably 0.6 or less, and still more preferably 0.5 or less.

Moreover, as shown in FIG. 3, it is preferable that the length of the center absorbent part 33 in the longitudinal direction Y is shorter than the front side absorbent sheet 31 and the back side absorbent sheet 32. Thereby, the above three components can have more opportunities to come into contact with excretion fluid, thereby exhibiting stable antibacterial and deodorizing effects over a long period of time, and the inhibitory effect on the migration of the above three components from the absorbent body 3 to the outside can be improved. More specifically, from the perspective of increasing the opportunity for the above three components to come into contact with excretion fluid and further improving the long-term and stable antibacterial and deodorizing effects, the length T2 of the central absorbent portion 33 in the longitudinal direction Y is longer than that of the front surface. The ratio (T2/T1) of the lengths T1 of the side absorbent sheet 31 and the back side absorbent sheet 32 in the longitudinal direction Y is preferably 0.2 or more. Moreover, from the viewpoint of improving the inhibitory effect on the migration of the above three components from the absorber 3 to the outside, the above ratio (T2/T1) is preferably 0.5 or less. Within the range of the above ratio, the central absorbent portion 33 is preferably a portion disposed from the middle portion C including the excretion portion opposing portion region C1 to the rear portion R in the longitudinal direction Y of the sanitary napkin 10 .

It is preferable that the length of the central absorbent part 33 in the longitudinal direction Y is shorter than that of the front side absorbent sheet 31 and the back side absorbent sheet 32, and that it is between the central absorbent part 33 and the front side absorbent sheet 31 and the back side absorbent sheet. In the laminated area of the material 32, the absorption capacity per unit area of the central absorbent part 33 is greater than the absorption capacity per unit area of the front side absorbent sheet 31 and the back side absorbent sheet 32 respectively. Thereby, even when the sanitary napkin 10 is used for a long time, the central absorbent part 33 can reliably absorb and hold the excretion liquid in the excretion part facing area C1, and can further enhance the antibacterial and deodorizing effects of the above three components. . In this case, if the polyphenol compound has the above-mentioned water solubility, in addition to the above-mentioned role played by the water-soluble antibacterial agent, the polyphenol compound can move to various positions in the central absorbing part 33 to non-volatize the odor-causing substances. . Specifically, from the above point of view, the absorption capacity per unit area (M3) of the central absorbent portion 33 is relative to the absorption capacity per unit area (M1) of the front side absorbent sheet 31 and the back side absorbent sheet. The ratio of at least one of the absorption capacities (M2) per unit area (M2) of 32 (M3/M1, M3/M2) is preferably 1.1 or more, more preferably 1.5 or more, and still more preferably 2 or more. Furthermore, from the viewpoint of suppressing wearing discomfort caused by excessive expansion of the central absorbent portion 33 due to excessive absorption of body fluids, the ratio (M3/M1, M3/M2) is preferably 20 or less, more preferably 15 or less, and further Preferably it is 10 or less.

(Measurement method of absorption capacity per unit area) For each of the front absorbent sheet 31, the back absorbent sheet 32, and the central absorbent portion 33 (hereinafter also referred to as each absorbent portion), the absorption was measured based on the water absorption test method for superabsorbent resin, that is, JIS K 7223-1996 capacity. Each absorbent portion was taken out from the absorbent article (sanitary napkin 1) and immersed as a whole in physiological saline (0.9 mass % sodium chloride water) adjusted to a temperature of 25°C. After 10 minutes from the start of immersion, the absorbent body was taken out of the physiological saline and dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., special model 130c). Dehydration conditions were set to 800 rpm × 5 minutes. After dehydration, measure the mass of the sample, calculate the centrifugal holding capacity (unit: g/g) according to the following formula, divide the calculated value by the area of each absorption part, and set the value obtained as the absorption capacity per unit area of each absorption part. . In the following formula, the unit of each mass is g. Centrifugal holding capacity = (mass of the absorbent body after centrifugal dehydration - mass of the absorbent body before water absorption)/mass of the absorbent body before water absorption The measurement is performed 5 times, the value of 1 point above and below is excluded, and the average value of the remaining 3 points is taken as the measurement value. In addition, the measurement was performed at 23±2°C and a humidity of 50±5%. Before the measurement, each absorbing part of the sample was stored in the same environment as the measurement for more than 24 hours.

The central absorbent part 33 preferably has a laminated structure of the above-mentioned absorbent sheet, and a water-soluble antibacterial agent is contained inside the laminated structure. Thereby, the water-soluble antibacterial agent exists deeper inside the laminated structure of the absorbent body 3 . Therefore, it is more difficult for the water-soluble antibacterial agent to come into contact with the skin, and the irritation of the water-soluble antibacterial agent to the skin is suppressed. Furthermore, in this case, it is preferable that a water-soluble antibacterial agent, a porous material, and a polyphenol compound are contained inside the laminated structure of the absorbent sheet in the central absorbent portion 33 .

The laminated structure of the absorbent sheet in the central absorbent part 33 may be formed by folding one absorbent sheet 3B as shown in FIG. 2 , or may be formed by laminating a plurality of absorbent sheets. When one absorbent sheet 3B is folded to form a laminated structure of the central absorbent portion 33, various folding configurations may be adopted. In the aspect shown in FIG. 2 , the central absorbent portion 33 has a laminated structure in which one absorbent sheet 3B is folded into three at two bending portions A1 and A2 in the transverse direction X. By folding into three folds as described above, the absorbent sheet 3B is divided into a first folded portion 33A, a second folded portion 33B, and a third folded portion from both end portions E1 and E2 in the transverse direction X and the folded portions A1 and A2. Pleats 33C. The first pleat portion 33A is a portion from the end E1 side to the bending portion A1, and is located on the skin-facing side 10A of the central absorbent portion 33. The second pleat portion 33B is a portion between the bend portions A1 and A2, and is located on the non-skin-facing side 10B of the central absorbent portion 33. The third pleat portion 33C is a portion from the bent portion A2 to the end portion E2, is sandwiched between the first pleat portion 33A and the second pleat portion 33B in the thickness direction, and is arranged inside the laminated structure of the central absorbent portion 33 . The end portion E1 of the first pleat portion 33A and the end portion E2 of the third pleat portion 33C are arranged so as to overlap in the thickness direction at the center portion in the width direction X. In addition, the end portion E2 of the third pleat portion 33C is wrapped by the first pleat portion 33A and the second pleat portion 33B and enters the inside of the laminated structure of the central absorbent portion 33 . It is preferable that the inside of the above-described laminated structure contains a water-soluble antibacterial agent on the non-skin-facing side 10B of the first pleat portion 33A and the skin-facing side 10A of the third pleat portion 33C and the second pleat portion 33B. agent. This makes it more difficult for the water-soluble antibacterial agent to come into contact with the skin, and the irritation of the water-soluble antibacterial agent to the skin is suppressed.

The discharged excretion liquid passes through the front sheet 1 and the front absorbent sheet 31 and reaches the central absorbent part 33 . At this time, generally speaking, the excretion liquid spreads along the longitudinal direction Y and the transverse direction X on the surface of the central absorbent portion 33 . On the other hand, if the absorption capacity per unit area in the width direction Easy to have margin. Therefore, even if a large amount of excretion fluid reaches the central absorbent part 33 due to long-term wearing, most of the excretion fluid will be absorbed and antibacterial in the central part that reaches it first, so the antibacterial effect is easy to last. In addition, if the central absorbent part as shown in Figure 2 is structured such that the thickness of the central absorbent part is thicker in the width direction to the central absorption part, so it is easy to provide antibacterial effect in a narrow position far away from the central absorption part of the skin, which is preferable.

The laminated structure of the central absorbent part 33 is not limited to the aspect shown in FIG. 2 , and may take various folded forms. For example, it may be a structure in which at least one of the first pleat part 33A and the third pleat part 33C of the absorbent sheet 3B forming the central absorbent part 33 reaches both ends of the second pleat part 33B, or A structure in which absorbent sheets 3B that are shorter than those in the above-mentioned embodiment are stacked, or a central absorbent portion 33 with a narrow width, are formed by mixing pulp fibers and high-absorbent polymers.

Furthermore, as shown in FIG. 4 , the central absorbent portion 33 preferably includes a high fiber presence portion 35 with a large content of fiber material, and a low fiber presence portion 36 with a small content of the fiber material, and The low-fiber presence portion 36 contains the above-mentioned water-soluble antibacterial agent, porous material, and polyphenol compound. Accordingly, when the central absorbent portion 33 retains excretion fluid, the liquid retention amount of the low fiber presence portion 36 is smaller than the liquid retention amount of the high fiber presence portion 35 . Therefore, the water-soluble antibacterial agent, or the water-soluble antibacterial agent and the polyphenol compound are more likely to be dissolved in a high concentration in the low-fiber-present portion 36 than in the high-fiber-present portion 35 . In addition, in the low-fiber presence portion 36, since the amount of fiber is higher than in the fiber-present portion 35, the water-soluble antibacterial agent, or the water-soluble antibacterial agent and the polyphenol compound are easily moved. Therefore, the water-soluble antibacterial agent or the water-soluble antibacterial agent and the polyphenol compound eluted at a high concentration can diffuse more widely and more quickly in the low fiber presence portion 36, thereby exhibiting the above-mentioned antibacterial and deodorizing effects more efficiently.

The high fiber presence part 35 and the low fiber presence part 36 are in the absorbent sheet unit constituting the central absorbent part 33. Cut a 3 cm × 3 cm sample in the longitudinal direction and the transverse direction, and photograph the longitudinal and transverse cross sections to specify After magnifying the photo, count the number of fibers in the field of view.

From the viewpoint of expressing the above-mentioned effects more effectively and making it difficult for the above-mentioned three components including the water-soluble antibacterial agent to migrate to the outside of the central absorbent body 33, it is preferable that the low-fiber existing part 36 is disposed in a higher-fiber position. The existing portion 35 is located further inside the central absorbing portion 33 . Moreover, when the central absorbent part 33 has the above-mentioned absorbent sheet 3B, it is preferable that the absorbent sheet 3B itself is a sheet in which the high fiber presence part 35 and the low fiber presence part 36 are laminated in the thickness direction. In this case, the high fiber presence portion 35 and the low fiber presence portion 36 can be laminated in a layered state with clear boundaries between each other. Alternatively, the high fiber presence portion 35 and the low fiber presence portion 36 may be laminated and integrated in a state where the boundaries between each other cannot be distinguished by the fiber material of one entering the interfiber gaps of the fiber material of the other. In the absorbent sheet 3B, a porous material is supported between the fibers of the low-fiber presence portion 36 in advance, and a coating liquid in which the water-soluble antibacterial agent and the polyphenol compound are dissolved is blown by a sprayer or the like. The low fiber presence part 36 contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound. As a laminated structure using the center absorbent part 33 of the absorbent sheet 3B including the high fiber presence part 35 and the low fiber presence part 36, for example, the aspect shown in FIG. 5 can be mentioned.

The central absorbent part 33 of the aspect shown in FIG. 5 has a laminated structure in which the first pleat part 33A, the second pleat part 33B, and the third pleat part 33C are folded in three as shown in FIG. 2 . Each of the first pleated portion 33A, the second pleated portion 33B, and the third pleated portion 33C has a high fiber presence portion 35 and a low fiber presence portion 36 laminated in the thickness direction. Regarding the respective thicknesses of the first pleat portion 33A and the third pleat portion 33C, the high fiber presence portion 35 is disposed on the skin-facing surface side 10A, and the low fiber presence portion 36 is disposed on the non-skin-facing surface side 10B. Regarding the thickness of the second pleat portion 33B, a low fiber presence portion 36 is disposed on the skin-facing surface side 10A, and a high fiber presence portion 35 is disposed on the non-skin-facing surface side 10B. In this laminated structure, the skin-facing surface side 10A of the central absorbent portion 33 is composed of the high-fiber presence portion 35 of the first pleated portion 33A, and the non-skin-facing surface side 10B of the central absorbent portion 33 is composed of the second pleated portion 33B. The high fiber existing part 35 is formed. More specifically, from the skin-facing side 10A of the central absorbent portion 33 to the non-skin-facing side 10B, the high fiber presence portion 35 , the low fiber presence portion 36 , the high fiber presence portion 35 , and the low fiber presence portion 36 , the low fiber presence part 36 , and the high fiber presence part 35 , six fiber layers are laminated in this order. Thereby, the three low fiber presence portions 36 are arranged inside the laminated structure between the high fiber presence portion 35 of the first pleat portion 33A and the high fiber presence portion 35 of the second pleat portion 33B. In particular, the low fiber presence portion 36 of the third pleat portion 33C and the low fiber presence portion 36 of the second pleat portion 33B are directly laminated without interposing the high fiber presence portion 35 to form a low fiber presence laminated portion 37 . In the above-described laminated structure of the central absorbent portion 33, it is preferable that the three low fiber presence portions 36 (the first pleat portion 33A, the second pleat portion 33B, and the third pleat portion 33C) each have a low fiber presence portion 36. ) contains the above-mentioned water-soluble antibacterial agent, porous material and polyphenol compound. Thereby, in the three low fiber presence parts 36 arranged inside the laminated structure of the central absorbent part 33, especially the low fiber presence laminated part 37 in which the two low fiber presence parts 36, 36 are directly laminated, it is possible to include The above three components, including the water-soluble antibacterial agent, are difficult to migrate to the outside of the central absorbent body 33 and can perform the above functions more effectively. As a result, the sanitary napkin 10 can further suppress irritation to the skin and continuously suppress bad odor.

When the absorbent sheet 33B of the laminated structure forming the central absorbent portion 33 has the above-mentioned high fiber presence portion 35 and low fiber presence portion 36, absorbency with sufficient liquid diffusibility, liquid retention, and good wearing feel can be obtained. From the viewpoint of the article, the thickness of the absorbent sheet 33B is preferably 0.1 mm or more, more preferably 0.3 mm or more. Moreover, it is preferably 2 mm or less, more preferably 1.5 mm or less.

The material used for forming the components constituting the sanitary napkin 10 can be used without any particular restrictions, and those used in such articles can be used.

As the front sheet 1, various sheets having liquid permeability can be used. For example, a single-layer or multiple-layer nonwoven fabric or a perforated film can be used. Considering the good touch of the skin, hydrophilic non-woven fabric is preferred, heat-bonded non-woven fabric is more preferred, and hot-air non-woven fabric is particularly preferred. The fibers constituting the nonwoven fabric of the front sheet 1 are preferably hydrophilic-treated thermoplastic resin fibers, and the fibers are fibers that have been subjected to three-dimensional crimping such as secondary crimping or triple crimping. Specifically, the fibers constituting the nonwoven fabric of the front sheet 1 are coated with various hydrophilic materials at a stage before making composite fibers of polyethylene, polypropylene, polyester, nylon, and the like and cutting them into specific lengths to form short fibers. Chemical agent, thereby making it hydrophilic. As the hydrophilizing agent, various alkane sulfonates represented by α-olefin sulfonate, acrylates, acrylate/acrylamide copolymers, esteramides, salts of esteramides, polyethylene glycol, and the like can be used. Derivatives, water-soluble polyester resins, various silicone derivatives, various sugar derivatives, and mixtures thereof are generally used for hydrophilization treatment.

In addition, the front sheet 1 may have unevenness on the side facing the skin. When the front sheet 1 has a plural-layer structure, it may have a first fiber layer located on the side closer to the wearer's skin and a second fiber layer located on the side farther from the wearer's skin. The first fiber layer and the second fiber layer are integrated in the thickness direction by a plurality of locally formed joint portions. The portions of the first fiber layer located between the plurality of joint portions are convexly raised and can be used. A concave and convex sheet having the convex portions having the above concave and convex shape. As a concavo-convex sheet having a solid structure with convex portions, those described in Japanese Patent Application Laid-Open No. 2007-182662 or Japanese Patent Application Laid-Open No. 2002-187228 can be used, for example.

As the back sheet 2, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The back sheet 2 is liquid-impermeable (including liquid-impermeable) or water-repellent, and preferably a moisture-permeable resin film or the like is used.

The second sheet 4 is preferably hydrophilic and has excellent liquid diffusivity. Examples include nonwoven fabrics containing thermoplastic fibers. As the nonwoven fabric, nonwoven fabrics obtained by various production methods can be used. For example, it is possible to use a hot-air nonwoven fabric in which the thermal melting points of fibers are formed on a fiber web obtained by a carding method or an air-spinning method by a hot-air method, or a hot-rolling method in which a fiber web obtained by a carding method is used. Various non-woven fabrics such as hot-rolled non-woven fabrics, heat-embossed non-woven fabrics, spunlace non-woven fabrics, needle-punched non-woven fabrics, and resin-bonded non-woven fabrics are formed based on the thermal melting point of the fibers.

Furthermore, it is preferable that the absorbent body 3 has a color associated with at least one of a water-soluble antibacterial agent, a porous material, and a polyphenol compound, and that the front side absorbent sheet 31 exhibits a color that can be expressed through at least the front sheet 1 recognized. The "associated color" here refers to the color that consumers can associate with the effect based on social background or customs background, or the color that consumers can associate with "green tea with antibacterial effect" because of product packaging or the Internet. Color, etc. that are linked to the effect, etc. By having such a structure, the wearer can recognize the effect of the absorbent article before wearing it. Therefore, incorrect use of absorbent articles that have no function or have different functions can be suppressed.

Furthermore, it is preferable that the back side absorbent sheet 32 exhibits a color associated with at least one of a water-soluble antibacterial agent, a porous material, and a polyphenol compound, and that the color can be transmitted through the front sheet 1 or the back sheet 2 recognized. Since the color can be seen from three sides of the back sheet, users can confirm the image of the effect even before opening. Regarding menstrual sanitary napkins 1, since individual menstrual sanitary napkins 1 are individually packaged with packaging sheets before use, if the color of the back side absorbent sheet 32 can be seen through the packaging sheet, the function can be identified before opening. , therefore better.

Furthermore, in the menstrual sanitary napkin 10, it is preferable that the front side absorbent sheet 31 and the back side absorbent sheet 32 are colored in the same color. This is preferable because even if each of the absorbent sheets 31 and 32 does not contain too much of the dye to be used, the color can be easily recognized by the user, thereby minimizing the impact on the absorption speed or absorption capacity of body fluids.

As the side leakage-proof sheet 5, a laminated nonwoven fabric with high water pressure resistance, a laminated body of a resin film and a nonwoven fabric, or the like can be used.

The absorbent article of the present invention is not limited to the menstrual sanitary napkin of the above embodiment, and may be suitable for example, sanitary pads, incontinence pads, urine-absorbent pads, disposable diapers, etc. In addition, it is not limited to menstrual blood, but is also effective on other urine, vaginal secretions, soft stools, etc. Moreover, in addition to the above-mentioned structural members, members may be appropriately incorporated according to the use or function.

Regarding the above embodiment, the present invention further discloses the following absorbent article.

＜1＞ An absorbent article comprising a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets. The absorbent body The absorbent article contains an absorbent sheet containing fiber material as a structural member, and the absorbent article has a longitudinal direction corresponding to the wearer's front and back direction and a transverse direction orthogonal to the longitudinal direction; and The above-mentioned absorbent body has a laminated structure at least in the central portion of the transverse direction of the absorbent body, and the laminated structure includes a front-side absorbent sheet located on the skin-facing surface side and a back-side absorbing sheet located on the non-skin-facing surface side. and the central absorbent portion located between the two sheets, The above-mentioned central absorption part contains a water-soluble antibacterial agent, a porous material and a polyphenol compound.

<2> The absorbent article according to the above <1>, wherein the entire area of the central absorbent portion in plan view contains the water-soluble antibacterial agent, the porous material and the polyphenol compound. <3> The absorbent article according to the above <1> or <2>, wherein the central absorbent portion has a laminated structure of the absorbent sheet, and the water-soluble antibacterial agent is contained inside the laminated structure. <4> The absorbent article according to any one of the above <1> to <3>, wherein the polyphenol compound is a naturally derived component. <5> The absorbent article according to the above <4>, wherein the polyphenol compound is catechin in tea leaves. <6> The absorbent article according to any one of the above <1> to <5>, wherein the water-soluble antibacterial agent is a quaternary ammonium salt. <7> The absorbent article according to any one of the above <1> to <6>, wherein the longitudinal length of the central absorbent portion is shorter than the front side absorbent sheet and the back side absorbent sheet. , in the lamination area of the above-mentioned central absorbent part, the above-mentioned front-side absorbent sheet, and the above-mentioned back-side absorbent sheet, the absorption capacity per unit area of the above-mentioned central absorbent part is greater than that of the above-mentioned front-side absorbent sheet and the above-mentioned back-side absorbent sheet The absorption capacity per unit area of the respective sheets. <8> The absorbent article according to <7>, wherein the absorption capacity per unit area of the central absorbent portion is relative to the absorption capacity per unit area of the front side absorbent sheet and the back side absorbent sheet. The ratio of at least one of them is 1.1 or more and 20 or less, preferably 1.5 or more and 15 or less, and further preferably 2 or more and 10 or less. ＜9＞ The absorbent article according to any one of the above ＜1＞ to ＜8＞, wherein the central absorbent part has a high fiber presence part containing a large amount of the fibrous material, and the content of the fibrous material is higher than the above. A low-fiber portion has a small number of high-fiber portions, and the low-fiber portion contains the water-soluble antibacterial agent, a porous material, and a polyphenol compound. <10> The absorbent article according to any one of the above <1> to <9>, wherein the absorption capacity per unit area of the central absorbent portion is the highest in the width direction at a central portion of the central absorbent portion in the width direction. , the two sides are lower than the central part. <11> The absorbent article according to any one of the above <1> to <10>, wherein the thickness of the central absorbent portion is larger in the width direction central portion than in the width direction both sides. <12> The absorbent article according to any one of the above <1> to <11>, wherein the water-soluble antibacterial agent contained in the central absorbent portion has a basis weight of 0.003 g/m ² or more and 5.0 g/m ² or less, preferably 0.005 g/m ² or more and 3.0 g/m ² or less, more preferably 0.010 g/m ² or more and 1.0 g/m ² or less. <13> The absorbent article according to any one of the above <1> to <12>, wherein the porous material in the central absorbent portion has a basis weight of 0.5 g/m ² or more, preferably 1.0 g. /m ² or more, and 10 g/m ² or less, preferably 5.0 g/m ² or less. <14> The absorbent article according to any one of the above <1> to <13>, wherein the polyphenol compound contained in the central absorbent portion has a basis weight of 0.001 g/m ² or more, preferably 0.003 g. /m ² or more, more preferably 0.005 g/m ² or more. Moreover, it is 5.0 g/m ² or less, preferably 3.0 g/m ² or less, more preferably 1.0 g/m ² or less. <15> The absorbent article according to any one of the above <1> to <14>, wherein the porous material is a porous deodorant. <16> The absorbent article according to any one of the above <1> to <15>, wherein the porous material carries an antibacterial agent metal. <17> The absorbent article according to any one of the above <1> to <16>, wherein the front side absorbent sheet exhibits a function related to the water-soluble antibacterial agent, porous material or polyphenol compound. color. <18> The absorbent article according to any one of the above <1> to <17>, wherein the backside absorbent sheet exhibits a function related to the water-soluble antibacterial agent, porous material or polyphenol compound. color. <19> The absorbent article according to any one of the above <1> to <18>, wherein the polyphenol compound is catechin in tea leaves, and the color of the front side absorbent sheet is green.

The present invention and its implementation modes and examples have been described. However, as long as we do not specify otherwise, we do not intend to limit the invention to any details of the description, but believe that the invention does not violate the scope of the accompanying patent application. should be interpreted broadly within its spirit and scope.

This case claims priority based on Japanese Patent Application No. 2021-201888, which was filed in Japan on December 13, 2021. This application is referred to here and its contents are incorporated into this specification.

1: Front sheet 2: Back sheet 3:Absorbent body 3A, 3B: Absorbent sheet 4:Second sheet 5: Side leak-proof sheet 6: Wings 9: Peripheral sealing part 10: Menstrual sanitary napkins 10A: Skin facing side 10B: Non-skin facing side 31: Front side absorbent sheet 32: Back side absorbent sheet 33: Central absorption department 33A: 1st pleat part 33B: 2nd fold part 33C: 3rd fold part 35: High fiber presence part 36: Low fiber presence part 37: Low fiber exists in the laminated part A1: Bend part A2: Bend part C: middle part C1: Area opposite the excretory part (fluid-receiving area) E1: end E2: end F:Front part R:Rear part T1: length T2: length W1: Width W2: Width X: Horizontal Y: vertical

FIG. 1 is a partial cross-sectional perspective view schematically showing a menstrual napkin as a preferred embodiment of the absorbent article of the present invention in an extended state from the skin contact surface side. FIG. 2 is a cross-sectional view schematically showing a section along line II-II of the menstrual sanitary napkin shown in FIG. 1 . Fig. 3 is a plan view showing the state of the absorbent body as viewed from the skin-facing side. Fig. 4 is a cross-sectional view schematically showing the lamination state of the high fiber presence portion and the low fiber presence portion of the central absorbent portion. FIG. 5 is a cross-sectional view showing a preferred example of the laminated structure of the central absorbent portion formed by folding an absorbent sheet including a high fiber presence portion and a low fiber presence portion.

1: Front sheet

2: Back sheet

3:Absorbent body

4:Second sheet

5: Side leak-proof sheet

6: Wings

9: Peripheral sealing part

10: Menstrual sanitary napkins

10A: Skin facing side

10B: Non-skin facing side

C: middle part

C1: Area opposite the excretory part (fluid-receiving area)

F:Front part

R:Rear part

X: Horizontal

Y: vertical

Claims (23)

An absorbent article comprising a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets. The absorbent body The absorbent article contains an absorbent sheet containing fiber material as a structural member, and the absorbent article has a longitudinal direction corresponding to the wearer's front and back direction and a transverse direction orthogonal to the longitudinal direction; and The above-mentioned absorbent body has a laminated structure at least in the central portion of the transverse direction of the absorbent body, and the laminated structure includes a front-side absorbent sheet located on the skin-facing surface side and a back-side absorbing sheet located on the non-skin-facing surface side. and the central absorbent portion located between the two sheets, The above-mentioned central absorption part contains a water-soluble antibacterial agent, a porous material and a polyphenol compound. The absorbent article according to claim 1, wherein the entire area of the central absorbent portion in a plan view contains the water-soluble antibacterial agent, the porous material and the polyphenol compound. The absorbent article according to claim 1 or 2, wherein the central absorbent portion has a laminated structure of the absorbent sheet, and the water-soluble antibacterial agent is contained inside the laminated structure. The absorbent article of claim 1 or 2, wherein the polyphenol compound is a natural component. The absorbent article of claim 4, wherein the polyphenol compound is catechins in tea leaves. The absorbent article of claim 1 or 2, wherein the water-soluble antibacterial agent is a quaternary ammonium salt. The absorbent article of claim 1 or 2, wherein the longitudinal length of the central absorbent portion is shorter than the front absorbent sheet and the back absorbent sheet, In the laminated area of the above-mentioned central absorbent part, the above-mentioned front-side absorbent sheet, and the above-mentioned back-side absorbent sheet, the absorption capacity per unit area of the above-mentioned central absorbent part is greater than that of the above-mentioned front-side absorbent sheet and the above-mentioned back-side absorbent sheet. The absorption capacity per unit area of each sheet. The absorbent article according to Claim 7, wherein the absorption capacity per unit area of the central absorbent portion is greater than at least one of the absorption capacity per unit area of the front side absorbent sheet and the back side absorbent sheet. The ratio is above 1.1 and below 20. The absorbent article according to claim 1 or 2, wherein the central absorbent portion has a high fiber content portion having a greater content of the fiber material, and a low fiber content portion having a smaller content of the fiber material than the high fiber content portion, The above-mentioned water-soluble antibacterial agent, porous material and polyphenol compound are contained in the above-mentioned low fiber existing part. The absorbent article according to claim 9, wherein the low-fiber-containing portion is disposed closer to the center absorbent portion than the high-fiber-containing portion. The absorbent article according to claim 9, wherein the central absorbent portion has an absorbent sheet in which the high fiber content portion and the low fiber content portion are laminated in the thickness direction. The absorbent article according to claim 11, wherein the central absorbent portion has a laminated structure in which the absorbent sheet is folded in three at the first pleat portion, the second pleat portion, and the third pleat portion, From the skin-facing side to the non-skin-facing side of the above-mentioned central absorption part, the areas are divided into high-fiber-present part, low-fiber-present part, high-fiber-present part, low-fiber-present part, low-fiber-present part, and high-fiber-present part. There are 6 fiber layers in sequential lamination. The low fiber presence portion of the third pleat portion and the low fiber presence portion of the second pleat portion are directly laminated without interposing the high fiber presence portion to form a low fiber presence laminated portion. The absorbent article according to claim 1 or 2, wherein the absorption capacity per unit area of the central absorbent portion is the highest in the width direction central portion of the central absorbent portion, and the two side portions are lower than the central portion. The absorbent article according to claim 1 or 2, wherein the thickness of the central absorbent portion is larger at the center portion in the width direction than at both sides in the width direction. The absorbent article of Claim 1 or 2, wherein the water-soluble antibacterial agent contained in the central absorbent portion has a basis weight of 0.003 g/m ^{2 or more} and 5.0 g/m ² or less. The absorbent article according to claim 1 or 2, wherein the porous material in the central absorbent portion has a basis weight of 0.5 g/m ² or more and 10 g/m ² or less. The absorbent article according to claim 1 or 2, wherein the polyphenol compound in the central absorbent portion has a basis weight of 0.001 g/m ² or more and 5.0 g/m ² or less. The absorbent article of claim 1 or 2, wherein the porous material is a porous deodorant. The absorbent article of claim 1 or 2, wherein the porous material is loaded with antibacterial agent metal. The absorbent article according to claim 1 or 2, wherein the front side absorbent sheet exhibits a color associated with the function of the water-soluble antibacterial agent, porous material or polyphenol compound. The absorbent article of claim 20, wherein the polyphenol compound is catechin in tea leaves, and the color of the front side absorbent sheet is green. The absorbent article according to claim 1 or 2, wherein the back absorbent sheet exhibits a color associated with the function of the water-soluble antibacterial agent, porous material or polyphenol compound. The absorbent article according to claim 22, wherein the absorbent article is individually packaged with a packaging sheet before use, and the color of the backside absorbent sheet can be visually recognized through the packaging sheet.