TW201938209A - Absorbent article - Google Patents

Abstract

The present invention provides an absorbent article (1) comprising a front sheet (2), a back sheet (3) and an absorber (4) disposed between the two sheets, and has a longitudinal direction (X) and a transverse direction (Y). The absorber (4) includes, as structural members, absorptive sheets (401), (402) including a fiber material. The absorbent body (4) has a laminated structure including, at least in the central portion of the absorbent body (4) in the transverse direction Y, a front-side absorbent sheet (41) located on the skin-facing surface side, a back-side absorbent sheet (42) located on the non-skin-facing surface side, and a central absorbent portion (43) located between the two sheets. The central absorbent portion (43) has, in the thickness direction thereof, a first region (E) and a second region (F) in which the density of the fiber material is higher than that of the first region (E), and an antimicrobial agent (8) is disposed in the second region (F).

Description

Absorbent article

The present invention relates to an absorbent article.

Absorbent articles such as menstrual pads may cause unpleasant malodors after absorbing menstrual fluids such as menstrual blood, or may cause itching due to contact between the wearer's skin and body fluids. In order to eliminate such disadvantages, various studies have been conducted on the antibacterial function of absorbent articles. For example, Patent Document 1 describes an absorbent article having a functional absorbent body including a functional material that provides at least an additional function such as an antibacterial function in a central portion of the absorbent article, and the absorbent article is provided at a higher functionality than the absorbent article. The absorbent body is on the wearer side and the diffusivity of the body fluid is smaller than the wearer side absorber of the functional absorber. In addition, Patent Document 2 describes an absorbent article including an antibacterially active sheet containing an antibacterial agent in which a low-density portion having a fiber content of less than 50% by mass compared to the surroundings is formed. Further, Patent Document 3 describes an absorbent article in which a functional material region including a functional material containing an antibacterial agent and a fragrance is disposed between an absorbent layer of an absorbent material containing an absorbent body fluid and a front sheet, and A rolled portion obtained by compressing the functional material region and the adjacent layer adjacent to the functional material region in the thickness direction in the thickness direction is formed.
Prior art literature patent literature

Patent Literature 1: Japanese Patent Laid-Open No. 2010-110443 Patent Literature 2: Japanese Patent Laid-Open No. 2014-158509 Patent Literature 3: Japanese Patent Laid-Open No. 2016-067749

The present invention is an absorbent article comprising a front sheet that forms a liquid-permeable surface facing the skin, a back sheet that forms a non-skin facing surface, and an absorbent between the two sheets and containing a fiber-containing material The sexual sheet serves as an absorber of the constituent member, and has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction. The absorbent body has a laminated structure in at least a central portion of the absorbent body in the lateral direction, and the laminated structure includes a front-side absorbent sheet on the skin-opposing surface side, and a back-side absorbent sheet on the non-skin-opposing surface side. And a central absorber located between the two sheets. The central absorption portion has a first region in a thickness direction and a second region having a higher density of the fiber material than the first region, and an antibacterial agent is disposed in the second region.

Although the absorbent articles described in Patent Documents 1 to 3 are given an antibacterial function, when a large amount of body fluid is excreted or when the absorbent article is used for a long time, it is difficult to continuously suppress the proliferation of bacteria and cause the generation of malodor. Or itching may cause skin troubles.

Therefore, an object of the present invention is to provide an absorbent article capable of eliminating the defects of the aforementioned prior art.

Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment.
As shown in FIGS. 1 and 3, a menstrual tampon 1 (hereinafter, also referred to as a tampon 1), which is an embodiment of the present invention, has a front sheet 2 that forms a liquid-permeable surface facing the skin and a non-skin formation The opposite back surface sheet 3 and the liquid-retaining absorbent body 4 disposed between the two sheets 2 and 3. The front sheet 2, the absorber 4, and the back sheet 3 are integrated to constitute an absorbent body 5. A side leakage preventing sheet 6 is arranged on the front sheet 2 side of both sides in the longitudinal direction of the absorbent body 5.

The side leak-proof sheet 6 has a free end 6a which is not joined to the front sheet 2 and a fixed end 6b which is joined to the inner end of the bonding wire 61 to the front sheet 2. When used, the fixed end 6b is free from The ends 6a are separated from the front sheet 2 to form a leak-proof bag P for preventing leakage to the side. A non-skin facing surface side of the absorbent body 5 is provided with a body adhesive portion (not shown) for fixing the crotch portion of the shorts. In addition, the sanitary napkin 1 has a pair of wings 7 extending from the side edge of the absorbent body 5 to the laterally outward side on both sides of the longitudinal direction X. On the surface on the back sheet 3 side of the pair of wing portions 7, a non-skin-facing wing portion adhesive portion (not shown) for fixing to the crotch portion of the shorts is provided.

As the front sheet 2, the back sheet 3, and the side leak-proof sheet 6, various sheets and the like previously used for absorbent articles such as menstrual tampons can be used without particular limitation. For example, as the front sheet 2, a non-woven fabric having a single-layer or multi-layer structure, an apertured film, or the like can be used. The front sheet 2 may be one having unevenness on the skin-opposing surface side, or may be an oil agent or the like which is attached to the surface of the constituent fibers to control hydrophilicity. In the case where the front sheet 2 is a multi-layered structure, as the front sheet 2, an uneven sheet having a first fiber layer located on the side close to the wearer's skin and a skin located far from the wearer's skin is used. The second fiber layer on the side, the two fiber layers are integrated in the thickness direction by a plurality of joint portions formed locally, and the portions of the first fiber layer located between the plurality of joint portions are convexly raised to form the above. Convex part. As the uneven sheet having a convex portion having a solid structure, for example, those described in Japanese Patent Laid-Open No. 2007-182662 or Japanese Patent Laid-Open No. 2002-187228 can be used. As the back sheet 3, a resin film or a laminated body of a resin film and a nonwoven fabric or the like can be used. The back sheet 3 is a liquid impermeability (including liquid impermeability) or a water-repellent material, and a moisture-permeable resin film or the like is also preferably used. As the side leakage preventing sheet 6, a laminated nonwoven fabric having a high water pressure resistance, a laminated body of a resin film and a nonwoven fabric, and the like can be used.

As shown in FIG. 1, the sanitary napkin 1 has an excretion portion facing portion B including an excretion position portion disposed opposite to the wearer's liquid excretion portion when worn, and is disposed closer to the wearer's belly than the excretion portion facing portion B. The front (front) side part A, and the rear part C, which is disposed behind the wearer's back side (rear side) than the excretory part facing part B.
The sanitary napkin 1 and the absorbent body 5 have a longitudinal direction X corresponding to the front-back direction of the wearer and a transverse direction Y orthogonal to the longitudinal direction X. That is, the sanitary napkin 1 and the absorbent body 5 are sequentially divided into a front portion A, an excretory portion facing portion B, and a rear portion C in the longitudinal direction X. In the following descriptions, unless otherwise specified, the longitudinal direction X refers to the longitudinal direction X of the absorbent article or the component member along the longitudinal direction X of the absorbent article, and the transverse direction Y refers to the transverse direction Y or the structure of the absorbent article. The component is oriented in the transverse Y direction of the absorbent article. The constituent members of the absorbent article also include portions of the absorbent article including a plurality of constituent members such as an absorbent body or a central absorbent section described below.

In the absorbent article of the present invention, the skin-facing surface is the absorbent article or its constituent member, the surface facing the wearer's skin when the absorbent article is worn, and the non-skin-facing surface is the absorbent article or its constituent member. When wearing an absorbent article, it faces the side (usually the clothing side) opposite to the skin side. In the absorbent article of the present invention, the so-called excretory portion facing portion B means a region having wings in the longitudinal direction X of the absorbent article when the wing portion 7 is provided like the sanitary napkin 1 of this embodiment ( The area sandwiched between the root of one wing in the longitudinal direction X and the root of the other wing in the longitudinal direction X). Further, when the absorbent article does not have a wing portion, the central area when the entire length X of the absorbent article in the longitudinal direction X is divided into three equal parts is referred to as an excretory portion facing portion B.

In the sanitary napkin 1, the front sheet 2 covers the entire area of the skin-facing side of the absorbent body 4, and the back sheet 3 covers the entire area of the non-skin-facing side of the absorbent body 4. The front sheet 2 and the back sheet 3 are joined to each other by extending portions from the both ends of the longitudinal direction X of the absorbent body 4. In addition, the back sheet 3 and the side leak-proof sheet 6 are joined to each other at portions extending from both sides of the absorbent body 4 in the longitudinal direction X toward the outer side in the lateral direction Y. In this manner, the absorbent body 4 is sandwiched between the front sheet 2 and the back sheet 3, and the front sheet 2 or the side leak-proof sheet 6 and the back sheet 3 are joined to the entire periphery of the outer edge of the sanitary napkin 1. The bonding between the sheets constituting the sanitary napkin 1 is performed by any bonding means such as an adhesive, heat sealing, or ultrasonic sealing. Furthermore, in the example shown in FIG. 1, the pair of side leak-proof sheets 6 and 6 are respectively located at the first bonding wire 61 in a curved line at the facing part B of the excretion part and at the first bonding wire 61. The second z-shaped linear bonding line 62 before and after the longitudinal X is bonded to the front sheet 2, but the side leak-proof sheet 6 and the front may also be connected with a straight bonding line that extends over the entire length of the absorbent body 4. The sheet 2 is joined.

In the sanitary napkin 1, as shown in FIG. 3, a second sheet 21 made of a non-woven fabric is arranged between the front sheet 2 and the absorbent body 4. The second sheet 21 preferably has a width (length in the transverse direction Y) shorter than the width of the absorbent body 4 (length in the transverse Y direction), and preferably has a length in the longitudinal direction X longer than the length of the longitudinal direction X in the absorbent body 4 and extends throughout The sanitary napkin is arranged along the entire length of the longitudinal direction X. The second sheet 21 is a sheet which is different from the front sheet 2 and the absorber 4 in the technical field, which is also referred to as a sub-layer sheet. The second sheet 21 is connected to the front side by an adhesive or the like arranged in a strip or spiral shape. The sheet 2 and / or the absorbent body 4 are locally bonded. The second sheet 21 is a sheet which is responsible for improving the permeability of the liquid from the front sheet 2 to the absorbent body 4 or reducing the return of the liquid absorbed to the absorbent body 4 to the front sheet 2.
The absorbent article for menstrual blood absorption of the present invention may be one that does not include the second sheet.

As shown in FIG. 3, the absorbent body 4 includes absorbent sheets 401 and 402 containing a fiber material as constituent members, and in this embodiment, it has a laminated structure in which a plurality of absorbent sheets are laminated. More specifically, at the excretory portion facing portion B, at least the central portion in the lateral direction Y of the absorbent body 4 has a laminated structure including a front-side absorbent sheet 41 located on the skin facing surface side, and a non-skin The back side absorbent sheet 42 on the facing side and the central absorbent portion 43 between the two sheets.
As shown in FIG. 2, the central absorbent portion 43 of the sanitary napkin 1 is disposed in the excretory portion facing portion B only at the central portion in the transverse direction Y of the absorbent body 4. The upper side may be disposed between the front-side absorbent sheet 41 and the back-side absorbent sheet 42, and may have a width that extends across the full width of the absorbent body 4. The central absorbent portion 43 of the sanitary napkin 1 is arranged only in a part of the longitudinal direction of the absorbent body 4 as shown in FIG. 2. In addition, in FIG. 2, reference numerals 43s and 43s denote positions of both end edges in the width direction of the central absorbing portion 43.

As shown in FIG. 3 and FIG. 4 (a), the central absorbent portion 43 of this embodiment has a structure in which a plurality of central absorbent sheets 402 are laminated. The central absorbent portion 43 may have a single-layer structure in which the central absorbent sheet 402 is not laminated.
As shown in FIGS. 3 and 4 (a), the central absorbent portion 43 of the sanitary napkin 1 has a structure in which a plurality of central absorbent sheets 402 are laminated by folding a single central absorbent sheet 402. The central absorbent sheet 402 of the central absorbent portion 43 is formed into a three-layer laminated structure by bending and folding at two bending portions b1 and b2 spaced apart in the lateral direction Y of the absorbent body 4. In more detail, the central absorbent sheet 402 is bent toward the back sheet 3 side from the first bent portion b1 from the one end edge e1 of the central absorbent sheet 402 along the longitudinal direction X, and is formed from the one end edge. The second bending portion b2 is counted from e1, and is folded toward the front sheet 2 side so that the other end edge e2 on the opposite side to the above-mentioned one end edge e1 is disposed inside the three-layer laminated structure, thereby being folded into a vortex as a whole. shape.
The central absorbent sheet 402 is folded in this manner to form the skin facing surface side of the laminated structure of the central absorbent sheet 402, that is, the upper sheet 43a on the front sheet 2 side, and the non-skin pair of the laminated structure. The lower side sheet 43b facing the front side, that is, the back sheet 3 side, and the intermediate sheet 43c located between these two sheets 43a, 43b. In the figure, the central absorption portion 43 shown in FIG. 4 shows that the upper surface S1 is the surface facing the skin-facing surface side, that is, the front sheet 2 side, and the lower surface S2 is the non-skin facing surface side, that is, the back sheet. 3 side faces.

On the other hand, the front-side absorbent sheet 41 is arranged on the skin-opposing surface side of the central absorption portion 43, covering the entire area of the skin-opposing surface side of the central-absorption portion 43, and the back-side absorbent sheet 42 is arranged on the central absorption The non-skin facing surface side of the portion 43 covers the entire area of the non-skin facing surface side of the central absorption portion 43. The front-side absorbent sheet 41 and the back-side absorbent sheet 42 may be different sheets. In this embodiment, a wide body central portion in the width direction constitutes a front-side absorbent sheet. The absorbent sheet 41 and the portion of the body absorbent sheet 401 located on the non-skin facing surface side of the absorbent body 4 constitute a back-side absorbent sheet 42. In the example shown in FIG. 3, both end portions of the main absorbent sheet 401 in the lateral direction of the absorbent body 4 are bent toward the non-skin-facing surface side, and extend from the bent portion toward the inner side in the lateral direction of the absorbent body 4. Parts of the front ends are laminated to each other.

As shown in FIG. 5, the central absorbent sheet 402 constituting the central absorbent portion 43 has a first region E and a fiber material 48 having a higher density in the thickness direction of the sheet than the second region F of the first region E. The first area E and the second area F extend over the entire area in a direction parallel to the surface of the central absorbent sheet 402. The first region E and the second region F may be laminated in a manner that the boundary between the first region E and the second region F is clear, or at the boundary between the two regions, one fiber material 48 may enter another fiber material. The inter-fiber gap of 48 makes the interface between the two unclear.
The body absorbent sheet 401 in the sanitary napkin 1 of this embodiment has the same structure as the central absorbent sheet 402 except that neither the first region E nor the second region F contains an antibacterial agent.

Examples of the fibrous material 48 included in the central absorbent sheet 402 and the main absorbent sheet 401 include those in which a hydrophobic fiber is subjected to a hydrophilization treatment, and the hydrophilic fiber itself is hydrophilic. Especially preferred are those which are hydrophilic in nature and have water retention properties. Examples of the hydrophilic fiber include natural fibers, cellulose-based regenerated fibers, and semi-synthetic fibers. Examples of the hydrophilic fibers having water retention properties include cellulose fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. The cellulose fibers can be used singly or in combination of two or more. Examples of the raw material pulp of cellulose fibers include wood pulp such as coniferous kraft pulp or broadleaf kraft pulp, non-wood pulp such as cotton pulp, and grass pulp. As the cellulose-based fiber, a crosslinked cellulose fiber (pulp fiber) obtained by intracellular or intermolecular cross-linking of cellulose by an appropriate cross-linking agent can also be used. Regenerated cellulose fibers such as 嫘 萦 fiber.
The central absorbent sheet 402 and the main absorbent sheet 401 may include both cellulose-based fibers and synthetic fibers, such as thermoplastic fibers, or may include synthetic fibers, such as thermoplastic fibers, instead of cellulose-based fibers. As the thermoplastic fiber, for example, a single fiber formed using a single synthetic resin such as polyethylene, polypropylene, polyester, polyurethane, or the like, or a composite fiber formed using such two or more composite resins The composite fiber is, for example, a composite fiber such as a core-sheath type and a side-by-side type formed of two or more synthetic resins.

As shown in FIG. 1, in the sanitary napkin 1, the central absorbent sheet 402 is arrange | positioned from the excretion part opposing part B and the back part C in the longitudinal direction. Therefore, the portion where the central absorbent sheet 402 is arranged becomes a thicker portion 47 having a thicker thickness than the periphery of the absorbent body 4 compared to its periphery. Therefore, in a portion where the central absorbent sheet 402 is disposed, the absorbent body 4 is easily brought into close contact with the wearer's skin side when worn.

Each of the central absorptive sheet 402 and the main absorptive sheet 401 has a second region F having a higher density than the first region E. For example, the second region F overlaps the first region E in the thickness direction. The second region F is a structure in which the second region F is provided over the entire area, or the second region F is locally provided in a manner that only partially overlaps the first region E in the thickness direction. In the sanitary napkin 1 of the present embodiment, both the central absorbent sheet 402 and the main absorbent sheet 401 are provided in the second region F over the entire region of the first region E overlapping in the thickness direction.

Whether or not the absorbent sheet has the first region E and the second region F having different densities of the fiber material can be determined by, for example, the following method.

[Method for measuring density of fiber material]
Use a microscope (such as "VHX-1000" manufactured by KEYENCE Corporation) or a scanning electron microscope (such as JCM-5100 manufactured by Japan Electronics Co., Ltd.) to cut the absorbent sheet (non-woven fabric) or absorber in the thickness direction The section is enlarged and observed to obtain the image data of the section. The magnification at the time of observation is a magnification at which a cross section of about 10 to 70 fibers can be observed, and is usually a magnification of 20 to 200 times. In the observation field of view of the cut surface, the area occupied by the fibers per fixed field of view area (0.02 mm ² ) was determined by image analysis. Specifically, for the obtained image, using image processing software such as ImageJ, a threshold is set on the brightness boundary between the fiber and the portion where the fiber does not exist, and the brightness is binarized. Generally speaking, when white and black are binarized, the fiber becomes white, and the portion where there is no fiber becomes black. Therefore, in the thickness direction of the absorbent sheet, a region with a large number of white portions can be identified as the first. 2 area F, the area with many black parts is recognized as the 1st area E. Then, calculate the area with white and the area with black in the fixed field of view (0.02 mm ² ), and convert it into the area of the fiber per unit area (1 mm ² ), and set it as the density of the fiber material (mm ² / mm ² ). The measurement of the density of the fibrous material was performed at any of three locations of the first region E and the second region F of the absorbent sheet, and the average value was taken as the fiber density of the sample.

Regarding the central absorbent sheet 402, the density of the fiber material in the second region F measured by the above method is preferably 1.2 times or more the density of the fiber material in the first region E measured by the same method. It is more preferably 2 times or more, and preferably 10 times or less, more preferably 7 times or less, still more preferably 1.2 times or more and 10 times or less, and even more preferably 2 times or more and 7 times or less.

The so-called absorbent sheet refers to an absorbent body formed into a sheet shape, which is generally different from an absorbent body having a structure obtained by stacking absorbent materials. Representative examples of the absorbent sheet include those described in Japanese Patent No. 2963647 or those described in Japanese Patent No. 2955223. As the absorbent sheet, it is preferable to use the adhesive force generated by the superabsorbent polymer in a wet state or a binder such as an adhesive or an adhesive fiber added separately to make the constituent fibers to each other or the superabsorbent polymer. Those that are combined with the constituent fibers to form a sheet. In addition, as the absorbent sheet, an absorbent sheet including pulp manufactured by a method described in Japanese Patent Laid-Open No. 8-246395 can be used, and the pulp is pulverized and supplied with an airflow to be polymerized with high absorptivity. After the materials are deposited, dry sheets fixed with an adhesive (such as vinyl acetate-based adhesive, PVA (polyvinyl alcohol, polyvinyl alcohol), etc.); after applying a hot-melt adhesive between paper or non-woven fabric containing pulp An absorbent sheet obtained by dispersing a superabsorbent polymer; an absorbent sheet obtained by blending a superabsorbent polymer in a spunbond or meltblown nonwoven fabric manufacturing step. These absorbent sheets can be cut into a specific shape and used as a sheet-shaped absorbent body.

The central absorbent portion 43 of the absorbent body 4 in the sanitary napkin 1 has a structure in which three layers of the central absorbent sheet 402 are laminated as described above, whereby the first region E and the density of the fiber material are relatively low. The relatively high second region F is from the skin-facing surface side in the thickness direction Z of the central absorption portion 43 toward the non-skin-facing surface side, and sequentially generates the first region E, the second region F, the first region E, The second area F, the second area F, and the first area E. In addition, the black area in FIG. 4 (b) becomes the second area layered portion 44 where the second area F having a relatively high density of the fiber material is directly laminated without interposing the first area E. 4 (a) and 4 (b), the second region laminated portion 44 of the central absorption portion 43 includes a second region F of the intermediate sheet 43c and a second region F of the lower sheet 43b.

In the absorbent body 4 of the sanitary napkin 1, an antibacterial agent 8 is disposed in the second region F of the central absorbent sheet 402 constituting the central absorbent portion 43. More specifically, the antibacterial agent 8 is arranged in the second region F in the entire area of the central absorbent sheet 402 in a direction parallel to the surface of the sheet. Therefore, the antibacterial agent 8 is disposed in the second region F of the upper sheet 43a, the second region F of the intermediate sheet 43c, and the second region F of the lower sheet 43b, and 2 of the second region laminated portion 44-2 The antibacterial agent 8 is disposed in both of the second regions F, that is, in both the second region F of the intermediate sheet 43c and the second region F of the lower sheet 43b.

The sanitary napkin 1 of this embodiment is used by being fixed to the crotch portion of shorts and the like in the same manner as a normal menstrual sanitary napkin.
According to the sanitary napkin 1 of this embodiment, the central portion 43 is provided in the excretory portion facing portion B and at least the central portion in the transverse direction Y of the absorbent body 4, so the absorbent body 4 is in close contact with the excretory portion of the wearer, During wearing, the body fluid supplied from the opposite side of the skin is quickly absorbed to the central absorption portion 43. The central absorbent sheet 402 constituting the central absorbent portion 43 is located in the excretory portion facing portion B, and further has a first region E with a relatively low density of fiber material and a second region F with a relatively high density, and body fluids are easily guided and It is held in the second area F. In addition, since the central absorbent portion has a front-side absorbent sheet on the side facing the skin, the body fluid introduced into the central absorbent portion cannot easily return to the skin of the wearer. Moreover, since the antibacterial agent 8 is arranged in the second region F, the body fluid absorbed into the central absorption portion 43 can be stably with the antibacterial agent 8 for a long time immediately after being discharged in the second region F of the central absorbent sheet 402. contact. Therefore, the antibacterial effect of the antibacterial agent can be effectively used.

The above-mentioned high antibacterial effect is obtained by arranging the antibacterial agent in the central absorbent portion 43, and therefore, for example, the antibacterial agent may not be disposed throughout the absorbent body 4. Therefore, an excellent antibacterial effect can be obtained even with a relatively small amount of an antibacterial agent, and the generation of malodor caused by bacteria or other troubles caused by bacteria can be suppressed efficiently and for a long time. In particular, as long as the absorbent body 4 is manufactured without applying an antibacterial agent to the front-side absorbent sheet 41, the antibacterial agent does not easily migrate to the skin of the wearer, and therefore the antibacterial agent does not easily come into contact with the inherent bacteria existing on the skin of the wearer. , So the feeling of use becomes good.

In the sanitary napkin 1 according to this embodiment, as described above, the central absorption portion 43 has the second region laminated portion 44, and the antibacterial agent 8 is disposed in the second region F constituting the second region laminated portion 44. The second area laminated portion 44 is a portion where the second area F having a higher density of the fibrous material is overlapped. Therefore, the amount of the antibacterial agent 8 per unit area of the second area laminated portion 44 is larger than that of the second area laminated portion 44. In part, the chance of body fluids coming into contact with antibacterial agents immediately after excretion is increased. In addition, since the antibacterial agent is provided in a region surrounded by a region where the fiber material has a high density and high liquid retention, the body fluid and the antibacterial agent 8 are unlikely to be generated from the second region laminated portion 44 even after the absorption of the body fluid. mobile. Therefore, it is easy to maintain a high frequency of contact between the body fluid in the second-region layered portion 44 and the antibacterial agent 8, and the durability of the antibacterial effect is excellent. Therefore, for example, the following effects are obtained: (1) the antibacterial effect can be exhibited for a long time even with a small amount of an antibacterial agent, (2) the reduction of target strains that are not prone to obtain an antibacterial effect, and (3) the unpleasant maintenance over a long period of time The effect of the smell.
This effect is exhibited even when an antibacterial agent is disposed only in one of the two second regions F constituting the second region laminated portion 44. However, as shown in the sanitary napkin 1 of this embodiment, The antibacterial agent 8 is disposed on both of the two second regions F constituting the second region laminated portion 44. In terms of the continuity of the antibacterial effect, it is preferred that an antibacterial agent is disposed in at least the second region F of the skin-opposing surface side of the two second regions F constituting the second region laminated portion 44.

Moreover, in the sanitary napkin 1 of this embodiment, the antibacterial agent 8 is arrange | positioned over the whole area of the 2nd area | region laminated | stacking part 44 of the absorber 4 in plan view.
If the antibacterial agent 8 is arranged in the entire area of the second region laminated portion 44 of the absorbent body 4 in a plan view, after the body fluid is repeatedly discharged, the area in contact with the antibacterial agent 8 in the sanitary napkin 1 even after the body fluid has diffused. Increasing the contact of the body fluid with the antibacterial agent 8 in a wider range. By contacting a body fluid with an antibacterial agent in a wider range, an excellent effect that produces an antibacterial effect on more body fluids can be obtained.

From the viewpoint of increasing the contact area with body fluids and improving the antibacterial effect, it is preferable that the antibacterial agent 8 is distributed over the entire area of the second region F in a direction parallel to the surface of the central absorbent sheet 402. The basis weight of the antibacterial agent 8 can be appropriately determined according to the type of the antibacterial agent. If an example is given, it is preferably 0.005 g / m ² or more, more preferably 0.03 g / m ² or more, and preferably 5.0 g / m ^2. Hereinafter, it is more preferably 3.0 g / m ² or less, more preferably 0.005 g / m ² or more and 5.0 g / m ² or less, and still more preferably 0.03 g / m ² or more and 3.0 g / m ² or less.

As the antibacterial agent 8 used in the present invention, those used in antibacterial applications in absorbent articles such as menstrual tampons can be used without particular limitation. Examples include antibacterial metals, antibacterial metal supports, and organic antibacterial agents.
Examples of the antibacterial metal include copper, silver, gold, lead, nickel, tin, zinc, iron, and zirconium.
Examples of the antibacterial metal support include silver zeolite, divinylbenzene-2-vinylpyridine-2-vinylpyridine silver copolymer (for example, those described in Japanese Patent Laid-Open No. 2006-307404), and aluminum / silver. / Sodium nitrate silicate (for example, described in Japanese Patent Laid-Open No. 2005-232654), a composite of silicon dioxide / zinc oxide / alumina supported by silver or zinc (specifically, antibacterial properties are supported) Metal-to-metal replacement of calcinite minerals), silver zirconium phosphate, silver / zinc zeolite mixtures and other water-insoluble or water-insoluble antibacterial agents.
As the organic antibacterial agent, a quaternary ammonium salt is preferred, and among them, water-insoluble benzyl ammonium chloride, cetyl phosphorylated benzyl ammonium, and the like can be suitably cited.

The sanitary napkin 1 preferably contains a water-insoluble or water-insoluble antibacterial agent as the antibacterial agent. If the following water-insoluble or water-insoluble antibacterial agent is used as the antibacterial agent, the antibacterial agent can be inhibited from moving to other parts. Therefore, the concentration of the antibacterial agent in the second region F or the second region laminated portion 44 is maintained, and the antibacterial effect is achieved Its sustainability has been further improved. As an example of a water-insoluble or water-insoluble antibacterial agent, the above-mentioned antibacterial metal support is preferable. Furthermore, the term "antibacterial metal carrier" is water-insoluble or water-insoluble, meaning that even if the metal being carried is water-soluble, the carrier (preferably porous particles) carrying the antibacterial metal is also hardly water-soluble or water-soluble. Insoluble.

Furthermore, in the present invention, by disposing the antibacterial agent 8 in the second region F where the density of the fibrous material of the central absorbent sheet 402 is relatively high, it is easy to hold the body fluid in the second region F. Therefore, in order to suppress the movement of the antibacterial agent 8 from the second region F to another member, a water-soluble antibacterial agent can also be used. In particular, when the antibacterial agent 8 is provided in the second area F constituting the second area laminated portion 44, the antibacterial agent can be more effectively suppressed from moving from the second area F to other members.

Here, the so-called antibacterial agent is poorly soluble in water, which means that the solubility of 100 g of ion-exchanged water at 25 ° C is less than 20 g, and the solubility of the poorly-soluble antibacterial agent in ion-exchanged water at 25 ° C is preferably 10 g or less. It is more preferably 1 g or less. In addition, in this specification, when the said solubility is 0.1 g or less, it is set to water insolubility. In addition, in this specification, water-insolubility and water-insolubility may be collectively referred to as water-insolubility of a high-level concept. On the other hand, the so-called antibacterial agent is water-soluble, which means that the solubility in ion-exchanged water at 25 ° C is 20 g or more, and the solubility of water-soluble antibacterial agent in ion-exchange water at 25 ° C is preferably 40 g or more, and more preferably 50 g or more.
The solubility can be measured by the following method. Put 100 g of ion-exchanged water at 25 ° C into a 200 mL beaker, put a fully dried measuring object (antibacterial agent), put a stirring blade with a length of 20 mm and a width of 7 mm, and use a magnetic stirrer at 600 rpm. With stirring, the amount of the antibacterial agent dissolved in water at 25 ° C. was set as the amount before the solution was dissolved even after stirring for 1 hour. As the magnetic stirrer, HPS-100 manufactured by AS ONE Co., Ltd. can be used.

The content of the antibacterial agent 8 is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and more preferably 12% by mass relative to the total mass of the central absorbent sheet 402 constituting the central absorbent portion 43 of the absorbent body 4. It is preferably 5 mass% or less, more preferably 0.001 mass% or more and 12 mass% or less, and more preferably 0.01 mass% or more and 5 mass% or less.

In the absorbent article of the present invention, the absorbent body 4 preferably contains a deodorant, and particularly preferably, the central absorbent sheet 402 constituting the central absorbent portion 43 contains a deodorant. By blending the deodorant in the absorbent body 4 or the central absorbent sheet 402, it is possible to more effectively suppress the generation of unpleasant odors caused by bacteria by combining with the antibacterial agent.
When the central absorbent sheet 402 contains a deodorant, the deodorant may be contained in only the first region E, the deodorant may be contained in only the second region F, or the first and second regions E, F may be contained. Both of them contain the deodorant, and it is preferable that at least the second region F contains the deodorant. Antibacterial agents have the effect of suppressing the generation of odors caused by bacteria, but deodorants are expected to suppress odors that are not caused by bacteria, or odors that occur before the antibacterial agent functions. The presence of the deodorant in the central absorption portion 43, particularly in the second region F, can effectively suppress the escape of the skin-facing side and the non-skin-facing side of the odor self-absorbent article.

As a deodorant, it directly acts on the odor (odor substance), that is, a substance that can exhibit the deodorizing effect by adsorbing, neutralizing, and decomposing the odor (odor substance). This technology can be used It is also widely used in the field for deodorizing purposes. Examples of the deodorant used in the present invention include porous particles or a water-soluble pH buffer.

The porous particle as a deodorant means a particle having a plurality of fine pores at least on the surface of the particle and capable of capturing, adsorbing, and / or encapsulating a volatile odorous component into the pore. Examples of the material of the porous particles include organic compounds, inorganic compounds, polymers thereof, and combinations thereof. Specific examples thereof include acrylic polymers such as porous methacrylic polymers and porous acrylic polymers, aromatic polymers such as porous divinylbenzene polymers and 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, metal-bearing porous materials such as highly oxidized silica zeolites (hydrophobic zeolites), sepiolite, maycite, zeolites, and inorganic porous materials such as hydrated zirconia, etc. are preferably selected from the group consisting of At least one species in the group. The odorous components from urine, menstrual blood, and other odorous components to be deodorized are a mixture of ammonia, amines, fatty acids, hydrogen sulfide, or mercaptans. In general, the molecular size of these odorous components is 1 nm or more. Therefore, by using porous particles having an average pore diameter of 2 nm or more as a deodorant, a plurality of odorous components can be efficiently adsorbed.

The average pore diameter of the porous particles used in the present invention means the peak value of the pore diameter in the pore diameter distribution. From the viewpoints of the odor absorption effect and the difficulty in absorbing the fragrance components emitted from the following fragrances, and the fragrance is not easy to deteriorate and decrease, the peak value of the pore diameter of the porous particles is preferably smaller than the size of the fragrance components, and preferably 0.1 μm Hereinafter, it is more preferably 0.04 μm or less, and more preferably 0.005 μm or more. The peak of the pore diameter of the porous particles was measured by the following method.

<Method for measuring the peak value of pore diameter of porous particles>
The peak of the pore diameter of the porous particles can be measured by a multi-point method using liquid nitrogen using a pore distribution measuring device (Nippon bel Corporation, trade name: BELSORP mini II). The peak top in the pore distribution is set as the peak of the pore diameter. The measurement sample was pretreated by heating at 110 ° C for 1 hour.

In addition, a water-soluble pH buffering agent is an agent that neutralizes acidic or alkaline odorous components generated in a liquid phase such as excretory fluid and reduces the change in pH. That is, it neutralizes the deodorant with a balance effect. The agent is not particularly limited, and examples thereof include a weak acid or a conjugate base thereof, a mixture thereof, or a salt thereof, a weak base or a conjugate acid thereof, a mixture thereof, or a salt thereof, and the like. Specific examples of the water-soluble pH buffering agent include citric acid and the like as weak acids, and metal salts such as Na, K, and Ca as salts thereof. Examples of the weak base include polyhydroxyamine compounds such as tris (hydroxymethyl) aminomethane.

Particularly, in the sanitary napkin 1 according to this embodiment, as the pH buffering agent, those containing citric acid and tris (hydroxymethyl) aminomethane are preferred. By combining such a weak acid and a weak base component, not only can the odor generation from acidic and alkaline odorous components be effectively suppressed, but also the deodorization including only the pH buffering property can be effectively suppressed The agent cannot suppress the generation of odors including odors near neutrality. As a result, the absorbent article 1 using the absorbent body 4 containing such a pH buffering agent can be realized even if the absorbent body 4 is worn for a long time. The degree of odor is relatively high.

Moreover, in the said deodorant, the porous particle can carry an antibacterial or bactericidal metal. In this case, the porous particles have properties of both a deodorant and an antibacterial agent. In the sanitary napkin 1, it is preferable that the absorbent article contains porous particles supporting an antibacterial metal.

In the absorbent article of the present invention, the absorbent body 4 may contain a fragrance. The absorbent body 4 preferably contains perfume in the central absorbent portion 43, that is, the central absorbent sheet 402, and more preferably contains perfume in the second region F of the central absorbent portion 43 located in the thickness direction. In the manufacturing process of an absorber, it is preferable to supply a fragrance from the 2nd area F side of the center absorbent sheet 402. In this case, if the central absorbent sheet 402 is laminated so that the second region faces each other, the excessive scattering of the fragrance to other parts can be suppressed, and the fragrance is higher in the central absorbent sheet. The state in which the concentration exists is easy to maintain until the beginning of use, so it is preferable.
By arranging the fragrance in the central absorbent sheet 402 located in the thickness direction, it is possible to suppress the excessive volatilization of the fragrance and further improve the continuity of the masking effect of the odor. From the same viewpoint, it is preferable to mix more perfumes in the second region F of the central absorbent sheet 402 than in the first region E.
Examples of the fragrance include a fragrance having a green herbal flavor, a plant extract, and a citrus extract described in Japanese Patent Laid-Open No. 2007-244764.

The content of the fragrance is not particularly limited, and can be appropriately set according to the type of the fragrance and the like. For example, the content of the fragrance in the central absorbent sheet 402 in the expanded state is preferably 0.1 g / m ² or more and 1 g / m ² or less, and more preferably 0.2 g / m ² or more and 0.6 g / m ² or less.

The central absorbent sheet 402 and the main absorbent sheet 401 each preferably contain a superabsorbent polymer 46, the central absorbent sheet 402, and the main absorbent sheet 401 in the case of having the first and second regions, respectively. The amount of the superabsorbent polymer 46 contained in the first region E is preferably more than that in the second region F. In particular, if the superabsorbent polymer disposed in the first region has a water absorption rate of 20 mL / 0.3 g · 30 seconds or less, further 15 mL / 0.3 g · 30 seconds or less, and further 10 mL / 0.3 g · 30 seconds Hereinafter, most or all of the excreted bodily fluids are absorbed and retained by the superabsorbent polymer 46 in the first region E before they are absorbed or retained by the first region E and after being held in contact with the antibacterial agent in the second region. Better. In addition, the lower limit of the water absorption speed may be 0 mL / 0.3 g · 30 seconds or more, and if it is 2 mL / 0.3 g · 30 seconds or more, and further 4 mL / 0.3 g · 30 seconds or more, then The body fluid that has come into contact with the antibacterial agent is easily absorbed and retained in the first region E, and it is preferable from the viewpoint of suppressing liquid leakage.
The water absorption rate of the superabsorbent polymer was measured by the following method.

＜ Method of measuring water absorption rate ＞
The water absorption rate (unit: mL / 0.3 g · 30 seconds) obtained by the DW method was measured using a device (Demand Wettability Tester) generally known as a device for implementing the DW method. Specifically, in this device, the liquid level of physiological saline was set to the polymer dispersion stage [70 mm Put the No. 2 filter paper on the table on the glass filter No. 1] to the same water level, and spread 0.3 g of the superabsorbent polymer to be measured on the surface of the polymer spreading table. The water absorption amount at the time point when the superabsorbent polymer was dispersed was set to 0, and the water absorption amount after 30 seconds was measured. This water absorption is measured on the scale of a burette indicating the amount of decrease in the water level of physiological saline. The value of the obtained water absorption amount was set as the water absorption speed obtained by the DW method. The water absorption rate obtained by the DW method can be designed based on the shape, particle size, volume specific gravity, degree of crosslinking, and the like of the superabsorbent polymer. The measurement was performed at 23 ± 2 ° C. and a humidity of 50 ± 5%. Before the measurement, the sample was stored in the same environment for more than 24 hours and then measured.

As the superabsorbent polymer 46, a particulate form is generally used, and a fibrous form may be used. When a particulate superabsorbent polymer is used, its shape may be any of a spherical shape, a block shape, a bag shape, or an irregular shape. As the superabsorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can be used. Examples thereof include polyacrylic acid and a salt thereof, and polymethacrylic acid and a salt thereof. As the polyacrylate or polymethacrylate, a sodium salt can be preferably used. In addition, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acrylic acid ethylsulfonic acid, (methyl ) A copolymer obtained by copolymerizing a comonomer such as 2-hydroxyethyl acrylate or styrene sulfonic acid with acrylic acid or methacrylic acid within a range that does not reduce the performance of the superabsorbent polymer.

The thickness of each absorbent sheet is preferably 0.1 mm or more, particularly preferably 0.3 mm or more, and more preferably 2 mm or less, and even more preferably 1.5 mm or less. More specifically, in terms of obtaining an absorbent article having sufficient liquid diffusivity, liquid retention, and good wearability, it is preferably 0.1 mm or more and 2 mm or less, and particularly preferably 0.3 mm or more and 1.5 mm or less.

The absorbent sheet having the first and second regions used in the sanitary napkin 1 of the present embodiment can be produced, for example, by a method such as a wet papermaking method or a dry papermaking method. After the first fibrous sheet in the first region and the second fibrous sheet in the second region are combined, they are integrated with the adhesive force of the adhesive or binder fiber, the superabsorbent polymer in a swollen state, and the like to integrate them. . As a preferred example of a method for manufacturing an absorbent sheet, a wet fiber sheet is formed by a wet papermaking method, and a superabsorbent polymer is spread on the fiber sheet to make it a first fiber sheet in a wet state. material. Then, the second fiber sheet in the dry state was superimposed on the side of the first fiber sheet in the wet state where the superabsorbent polymer was dispersed, to obtain a laminated sheet. Then, the laminated sheet is dried by using a drying section such as a Yankee dryer to obtain a target absorbent sheet. The method of setting the density difference between the first fiber sheet and the second fiber sheet to the fiber material is not particularly limited. For example, the method can be used to increase the pressing force of the pressurizing portion after papermaking in the manufacturing step of the second fiber sheet. A method for the first fiber sheet; a method for changing the material or thickness of the constituent fibers of each fiber sheet to form the first fiber sheet with a lower density than the second fiber sheet; in the first and second methods A method in which one or both of the fiber sheets are in the wet section of the laminated sheet, and the second sheet is placed on the Yankee dryer side for drying; or a combination of two or more of these methods. The central absorbent sheet 402 used in the sanitary napkin 1 of the present embodiment can be manufactured by applying an antibacterial agent to the first fiber sheet in the second region and then making it the first The first fibrous sheet in the area is integrated by integration. Examples of the method for applying the antibacterial agent to the second fiber sheet include: a method of applying a solution or dispersion containing an antibacterial agent to the second fiber sheet before bonding; and to the second fiber sheet side of the composite sheet After the surface is coated with a solution or dispersion containing an antibacterial agent, it is heated or naturally dried; a method of spreading or blowing particles on the composite sheet from the second fiber sheet side. Examples of the method for applying a solution or dispersion containing an antibacterial agent include spray methods, transfer methods, die coating, gravure coating, inkjet methods, and screen printing using known liquid coating devices. Wait.

In addition, the absorbent body 4 of the sanitary napkin 1 of the present embodiment has a thick-walled portion 47 including a central absorbent portion 43 composed of a central absorbent sheet 402 and a front-side absorbent sheet 41 and a back-side absorbent material. The flexible sheet 42 sandwiches the formed five-layered absorbent sheet. The thick-walled portion 47 is formed in the central portion of the absorbent body 4 in the lateral direction Y, and is also formed in the longitudinal direction X of the absorbent body 4 mainly in the excretory portion facing portion B. The so-called formed mainly in the excretory portion facing portion B means that more than 50% of the longitudinal length of the thick wall portion 47 exists in the excretory portion facing portion B. The thick portion 47 having a width less than the full width of the absorbent body 4 is provided in the central portion in the width direction of the absorbent body 4, so that a large amount of body fluid discharged to the central portion in the width direction can be efficiently absorbed into the central absorbent portion. 43. The second region F in the central absorbing portion 43 is in contact with the antibacterial agent efficiently, so that the generation of unpleasant odors caused by bacteria can be more effectively suppressed. From this point of view, the width of the central absorbing portion 43 is preferably 25% or more, more preferably 40% or more, and the full width of the absorbent body 4 in the longitudinal X portion where the central absorbing portion 43 is present. 75% or less, more preferably 60% or less, more preferably 25% or more and 75% or less, and more preferably 40% or more and 60% or less. From the same point of view, the length of the longitudinal direction X of the central absorbing portion 43 is preferably 5% or more, more preferably 15% or more, and 65% or less of the total length of the absorbent body 4 in the longitudinal direction X. It is preferably 55% or less, more preferably 5% or more and 65% or less, and still more preferably 15% or more and 55% or less.

The thickness of the absorber 4 in the thick wall portion 47 is preferably 0.7 mm or more, further preferably 1 mm or more, and more preferably 5 mm or less, further preferably 4 mm or less, and more specifically, 0.7 mm to 5 mm, more preferably 1 mm to 4 mm. By setting the thickness of the thick wall portion 47 to such a range, it is easy to achieve a good wearing feeling, a high absorption performance, and a high antibacterial effect of the excretory portion facing portion B at the same time. Moreover, when the absorbent article is provided with a wing part like the sanitary napkin 1 of this embodiment, it becomes easy to suppress the wrinkles of the absorber of the facing part of an excretion part at the time of wearing. The thickness of the absorber outside the thick wall portion 47 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and more preferably 3 mm or less, and further preferably 2.5 mm or less. More specifically, It is preferably 0.3 mm to 3 mm, and more preferably 0.5 mm to 2.5 mm. This range is preferable from the viewpoint of achieving higher absorption performance and improving followability to the wearer's motion. In addition, the thickness of an absorber and an absorbent sheet was measured by the following method.

<Method for measuring thickness of absorbent sheet and absorbent body>
The absorptive sheet or absorbent body to be measured was placed in a horizontal place without wrinkles or bending, and the thickness was measured under a load of 5 cN / cm ² . In the present invention, the thickness is measured using a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG. CO. LTD.). At this time, a plate having a circular shape or a square shape (acrylic resin plate having a thickness of about 5 mm) is arranged between the front end portion of the thickness meter and the measurement portion of the measurement object so that the load becomes 5 cN / cm ² Adjust the size of the board.

In the sanitary napkin 1 of the present embodiment described above, as shown in FIGS. 2 and 3, the absorbent body 4 is provided with a slit 45 extending parallel to the longitudinal direction X in the excretory portion facing portion B of the absorbent body 4. Therefore, in the sanitary napkin 1 of this embodiment, the longitudinal direction of the slit 45 is parallel to the longitudinal direction X. By the slits 45, the menstrual blood reaching the absorbent body 4 becomes easy to diffuse in the longitudinal direction X, and it also becomes easy to penetrate in the thickness direction of the absorbent body 4. In the sanitary napkin 1, as shown in FIG. 2, the slits 45 extending in the longitudinal direction X are formed as slit regions 45S in a state of being dispersed in both the longitudinal direction X and the lateral direction Y. The slit region 45S in which the plurality of slits 45 are arranged extends not only across the excretory portion facing portion B, but also across a portion of the front portion A and a portion of the rear portion C.

The slit 45 is formed by making a cut out of the absorbent sheet.
If the slits 45, especially the slit regions 45S in which the slits 45 are dispersedly disposed, are disposed so as to be laminated with the absorbent body 4, all of the front-side absorbent sheet 41, the central absorbent portion 43 and the back-side absorbent sheet 42 are arranged. In a state where the regions overlap, the slit 45 follows the action of the wearer's body and opens, quickly guiding the body fluid to the central absorbent portion 43 to which the antibacterial agent is given, which is different from a part of a plan view where the absorbent sheet is cut out. With the opening formed, the antibacterial agent in the central absorption portion 43 or the body fluid moved into the central absorption portion 43 cannot easily return to the surface of the sanitary napkin 1. Thereby, both the antibacterial effect and the absorption performance become excellent.
The slit 45 may be a through-hole that penetrates all the absorbent sheets from the front-side absorbent sheet 41 to the back-side absorbent sheet 42, or may be a non-through hole that does not penetrate all the absorbent sheets. The slit 45 is preferably one that penetrates the front-side absorbent sheet 41 and reaches the inside of the thickness direction of the central absorbent portion 43. As an example, in addition to the slits 45 penetrating all the absorbent sheets described above, the slits reach the second region F of the upper sheet 43a on the central absorbent portion and do not reach the first region E of the intermediate sheet 43c. ; Or a slit that reaches the second region of the middle sheet 43c of the central absorption portion and does not reach the first region E of the lower sheet 43b.

The opening width W45 of the slit 45 on the front sheet 2 side is preferably 1.2 mm or less, more preferably 1.0 mm or less, and even more preferably 0.5 mm or less. When the slit 45 is formed by a cut, the lower limit value of the opening width W45 is substantially 0 mm, and may be about 0.01 mm. In addition, the interval D45 between the slits 45 and 45 in the lateral Y is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.5 mm or less, and further preferably 1.2 mm or less, more specifically , Preferably 0.1 mm to 1.5 mm, and more preferably 0.2 mm to 1.2 mm. The opening width W45 of the slit 45 of the absorbent body 4 is measured by the following method.

<Measurement method of the opening width of the slit 45>
The opening width of the slit 45 is obtained by removing the absorbent body 4 from the sanitary napkin 1 and placing the taken-out absorbent body 4 horizontally. The measurement magnification is adjusted and enlarged using a digital microscope VHX-1000 manufactured by Keyence to measure the opening width.

The length (length in the longitudinal direction) L45 (refer to FIG. 2) of the slit 45 when the absorber 4 is viewed in plan view is preferably 10 mm or more, further preferably 15 mm or more, and more preferably 35 mm or less, and even more preferably 25 It is preferably 10 mm or more and 35 mm or less, and more preferably 15 mm or more and 25 mm or less.

In the sanitary napkin 1, an adhesive is preferably applied and fixed between the front sheet 2 and the absorbent body 4 and between the absorbent body 4 and the back surface sheet 3. Moreover, the interlayers of the absorbent sheet constituting the laminated body of the absorbent body 4 may or may not be adhered. From the viewpoint of wrinkling or shifting of the absorbent body during use, it is preferable to be bonded by an adhesive.
The adhesive can be applied by a known mechanism, for example, using a slit coating gun, a spiral spray gun, a spray gun, or a spot gun. In the sanitary napkin 1, the spiral spray gun is preferably applied in a spiral shape. As a coating adhesive, for example, a hot-melt adhesive is preferably used. The coating amount of the hot-melt adhesive is preferably 1.5 g / m ² or more and 10 g / m ² or less.

In addition, in order to form the slit 45 in the absorbent body 4 as shown in the sanitary napkin 1, the laminated body of the absorbent sheet may be partially cut by a known cutting mechanism. For example, a cutting device such as the following may be used. The cutting device includes a cutter roll in which a plurality of cutting edges extending in the circumferential direction are dispersedly formed on a circumferential surface of the roll in a circumferential direction and an axial length direction of the roll, and an anvil roll that receives the edges of the cutting roll.

As shown in FIG. 1 and FIG. 3, the sanitary napkin 1 of this embodiment is provided with a front-side sheet 2 and an absorbent body 4 which are integrally recessed toward the back-sheet 3 side on the skin-facing side of the absorbent body 5. Slot 9. The nip groove 9 is a groove in which the front sheet 2 and the absorbent body 4 are both recessed, and the density of each fiber as a constituent member of the front sheet 2 and the absorbent body 4 is higher than that of the peripheral portion of the groove. The rolling groove may be a continuous line or a discontinuous line such as a dashed line. For example, the rolling groove may be formed by rows formed by embossing a plurality of discontinuous points. The sanitary napkin 1 has longitudinal rolling grooves 92 extending in the longitudinal direction X on both sides of the excretory portion facing portion B, and lateral rolling grooves 91 extending in the transverse direction Y on each of the front portion A and the rear portion C. When the absorbent body 4 is viewed from the top, longitudinal pressure rolling grooves 92 on each side of the lateral Y of the central absorbent portion 43 containing the antibacterial agent suppress the diffusion of the body fluid in the lateral Y and prevent leakage, and collect the body fluid to contain the antibacterial agent. The central absorption portion 43 of the agent is preferable. In addition, when the absorbent body 4 is viewed from the top, each side has a lateral rolling groove 91 before and after the longitudinal direction X of the central absorbent portion 43 containing the antibacterial agent. From a viewpoint point of view, it is better. The absorbent article of the present invention may not have any one or both of the longitudinal rolling grooves 92 and the lateral rolling grooves 91 or all of the rolling grooves 9.

The present invention has been described based on its preferred embodiment, but the menstrual absorbent article of the present invention is not subject to any restrictions on the sanitary napkin 1 of the above embodiment, and may be appropriately modified.

For example, any one or both of the front-side absorbent sheet 41 and the back-side absorbent sheet 42 may be a first region having a relatively low density of the fiber material and a second region having a relatively high density of the fiber material. Zoner.
In addition, the stacked state of the central absorbent sheet of the central absorption portion is not limited to that shown in FIG. 4, and various stacked states may be adopted.
The laminated state of the central absorbent sheet may be, for example, the state shown in Figs. 6 (a) to 6 (d). The central absorbent portion 43 shown in FIG. 6 (a) is formed by folding the central absorbent sheet 402 having the first region E and the second region F containing the antibacterial agent along the longitudinal bending portion b1 of the absorbent article. form. The central absorbent portion 43 shown in FIG. 6 (b) is a bent portion b1 of the central absorbent sheet 402 having the first region E and the second region F containing the antibacterial agent along the longitudinal direction of the absorbent article. , B2 is formed by folding and folding into a three-fold state. The central absorption portion 43 shown in FIG. 6 (c) is formed by superposing two central absorbent sheets 402 having a first region E and a second region F containing an antibacterial agent in a state where the second region F is in surface contact with each other. . In the central absorbing portion 43 shown in FIGS. 6 (a) to 6 (c), a second region lamination portion 44 is formed in which the second regions F are directly laminated without interposing the first region E with each other.

The central absorbent portion 43 shown in FIG. 6 (d) is such that the two central absorbent sheets 402 having the first region E and the second region F containing the antibacterial agent face the non-skin facing surface side with the second region F, respectively. It is laminated in this way. Regarding the central absorbent portion 43 and the central absorbent sheet 402 constituting the central absorbent portion 43 shown in Figs. 6 (a) to 6 (d), the central absorbent of the sanitary napkin 1 of the above embodiment is appropriately applied within a range not particularly contradictory. Explanation of the part 43 and the central absorptive sheet 402. For example, in the central absorption portion 43 shown in FIGS. 6 (a) to 6 (d), it is also preferable that the central absorption portion 43 is located in the thickness direction from the viewpoint of improving the sustainability of the antibacterial effect of the antibacterial agent. An antibacterial agent is disposed in the second region F inside Z, and is disposed in the central absorption portion 43 shown in Figs. 6 (a) to 6 (c) and in the two second regions F constituting the second region laminated portion 44. When either or both of the antibacterial agents are disposed, the antibacterial agent or body fluid becomes difficult to move to other parts, and the concentration of the antibacterial agent or the continuous improvement of the antibacterial effect are improved. In FIGS. 6 (a) to 6 (d), as in FIG. 4, the upper side in the figure is the skin-facing surface side, and the lower side in the figure is the non-skin-facing surface.
The number of layers of the central absorbent sheet 402 of the central absorbent portion 43 is preferably 2 or more, more preferably 3 or more, and more preferably 7 or less, more preferably 5 or less, and still more preferably 2 or more and 7 or less. Preferably it is 3 or more and 5 or less.
In addition, regarding the absorbent body 4, the front side absorbent sheet 41, the back side absorbent sheet 42, and the central absorbent portion 43 constitute the viewpoint of the absorption capacity or absorption rate when the body fluid is discharged, and no discomfort when worn. The total number of layers of the center layer of the central absorbent sheet 402 is preferably 3 or more, more preferably 5 or more, and more preferably 10 or less, more preferably 7 or less, and more preferably 3 or more and 10 or less. Preferably it is 5 or more and 7 or less.

In the sanitary napkin 1 of the above embodiment, the antibacterial agent is disposed in the second region F of the central absorbent sheet 402 constituting the central absorbent portion 43, but the first region E may contain an antibacterial agent or may not contain an antibacterial agent. . When the first region E contains an antibacterial agent, the same type of antibacterial agent as the antibacterial agent in the second region F may be contained as the antibacterial agent. Furthermore, as the antibacterial agent disposed in the first region E, a water-insoluble one is preferable, and among them, an antibacterial agent that is water-insoluble or a water-insoluble quaternary ammonium salt is preferable. In the first region, the fiber density is lower than that in the second region. Although the water-insoluble or water-insoluble but quaternary ammonium salt antibacterial agent is dispersed in the body fluid, it is easy to move with the body fluid to a relatively high fiber density. The second area F. By moving the antibacterial agent with the body fluid, the concentration of the antibacterial agent in the second region F is increased, and a higher antibacterial performance can be exhibited. At this time, as shown in the sanitary napkin 1, when the first region E is located on the skin-facing side and the second region F is located on the non-skin facing side, part of the body fluid is kept The first region E of the superabsorbent polymer, and the body fluid containing organic substances such as proteins that are not easily absorbed by the superabsorbent polymer are easily guided to the second region F where the fiber density is relatively dense. Therefore, it is possible to effectively suppress generation of an odor from an organic substance in the second region F, which is an environment where a high concentration of an antibacterial agent is present. Furthermore, at this time, by making the antibacterial agent in the first region E water-insoluble or water-insoluble, all the antibacterial agents do not move to the second region F and easily remain. Therefore, it is also possible to suppress the antibacterial agent from remaining in the first region E. Odor of organic substances present in body fluids.

The absorbent article for menstrual blood absorption according to the present invention may be a sanitary pad (vaginal pad) or the like in addition to a menstrual tampon.

Regarding the embodiment of the present invention described above, the following absorbent articles are further disclosed.
<1> An absorbent article comprising a front sheet forming a liquid-permeable surface facing the skin, a back sheet forming a non-skin facing surface, and a fiber-containing material located between the two sheets The absorbent sheet is an absorbent body constituting a member and has a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction. The absorbent body has a laminated structure in at least a central portion of the absorbent body in the lateral direction. The laminated structure includes a front-side absorbent sheet on the skin-facing side, a back-side absorbent sheet on the non-skin-facing side, and a central absorption portion between the two sheets. It has a first region in the thickness direction and a second region having a higher density of fiber material than the first region, and an antibacterial agent is disposed in the second region.

<2> The absorbent article according to the above <1>, wherein the central absorbent portion has a structure in which a plurality of central absorbent sheets are laminated, and the non-skin facing surface side in the thickness direction of the central absorbent portion has a plurality of Each of the second regions is a second region layered portion that is directly laminated without interposing the first region.
<3> The absorbent article according to the above <2>, wherein the antibacterial agent is arranged in the entire area of the second region laminated portion in a plan view of the absorbent body.
<4> The absorbent article according to any one of <1> to <3>, wherein the antibacterial agent includes a water-insoluble or water-insoluble antibacterial agent.
<5> The absorbent article according to the above <4>, wherein the water-insoluble or water-insoluble antibacterial agent is an antibacterial metal load.
<6> The absorbent article according to the above <5>, wherein a carrier of the antibacterial metal carrier is a hydrophobic porous particle.
<7> The absorbent article according to any one of <4> to <6>, wherein the antibacterial agent includes an organic antibacterial agent.
<8> The absorbent article according to <7>, wherein the organic antibacterial agent is a water-insoluble or water-insoluble quaternary ammonium salt.
<9> The absorbent article according to any one of the items <4> to <8>, wherein the water-insoluble or water-insoluble antibacterial agent and the water-soluble antibacterial agent are included as the antibacterial agent.
<10> The absorbent article according to any one of the items <1> to <9>, wherein the central absorbent portion has a structure in which a plurality of central absorbent sheets are laminated, and the content of the antibacterial agent is relative to the central absorbent property. The total mass of the sheet is 0.001% by mass or more and 12% by mass or less, preferably 0.01% by mass or more and 5% by mass or less.

<11> The absorbent article according to any one of the items <1> to <10>, wherein the central absorption portion contains a deodorant.
<12> The absorbent article according to the above <11>, wherein at least the second region contains the deodorant.
The <13> absorbent article as described in said <11> or <12> which contains a porous particle as said deodorant.
The <14> absorbent article as described in any one of said <11> to <13> which contains a pH buffer as said deodorant.
<15> The absorbent article according to the above <14>, wherein the pH buffer includes citric acid and tris (hydroxymethyl) aminomethane.
The <16> absorbent article as described in any one of said <1> to <15> whose said central absorption part contains a fragrance | flavor.
<17> The absorbent article according to any one of <1> to <16>, wherein the absorbent body is on the front-side absorbent sheet, the central absorbent sheet constituting the central absorbent portion, and the back-side The area where the absorbent sheet overlaps has a slit that penetrates the front-side absorbent sheet and reaches the inside of the central absorption portion in the thickness direction.
The <18> absorbent article as described in said <17> whose length direction of the said slit extends parallel to the said longitudinal direction.
<19> The absorbent article according to <17> or <18>, wherein the length of the slit in the longitudinal direction is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less.
<20> The absorbent article according to any one of the above <17> to <19>, wherein the slit has an opening width of 1.2 mm or less, preferably 1.0 mm or less, and more preferably 0.5 mm or less.

<21> The absorbent article according to any one of <17> to <20>, wherein the plurality of slits are dispersedly arranged in both the longitudinal direction and the lateral direction.
<22> The absorbent article according to any one of <1> to <21>, wherein the first region contains a superabsorbent polymer.
The <23> absorbent article as described in said <22> whose content of the said superabsorbent polymer in the said 1st area is more than the said 2nd area.
<24> The absorbent article according to <22> or <23>, in which the water absorption rate of the superabsorbent polymer is 20 mL / 0.3 g · 30 seconds or less, preferably 2 mL / 0.3 g · 30 seconds or more 15 mL / 0.3 g · 30 seconds or less, more preferably 4 mL / 0.3 g · 30 seconds or more and 10 mL / 0.3 g · 30 seconds or less.
<25> The absorbent article according to any one of <1> to <24>, wherein the absorbent body has a thick-walled portion at an excretory portion facing portion.
<26> The absorbent article according to the above <25>, wherein the width of the central absorbent portion does not reach the full width of the absorbent body.
<27> The absorbent article according to the above <26>, wherein the width of the central absorbent portion is 25% or more and 75% or less, preferably 40% or more and 60% or less of the full width of the absorbent body in which the central absorbent portion exists. the following.
<28> The absorbent article according to any one of the above <25> to <27>, in which more than 50% of the full length of the thick-walled portion in the longitudinal direction is present in the opposite portion of the excretion portion.
<29> The absorbent article according to the above <28>, wherein the length in the longitudinal direction of the central absorbent portion is 5% or more and 65% or less, and preferably 15% or more and 55% or less of the total length of the absorbent body in the longitudinal direction.
<30> The absorbent article according to any one of <1> to <29>, wherein the first region also contains an antibacterial agent.

<31> The absorbent article according to the above <30>, wherein the antibacterial agent contained in the first region is water-insoluble or water-insoluble.
<32> The absorbent article according to the above <31>, wherein the antibacterial agent contained in the first region is a water-insoluble or water-insoluble quaternary ammonium salt.
<33> The absorbent article according to any one of <1> to <32>, wherein the absorbent article is a menstrual tampon.
[Industrial possibilities]

The absorbent article according to the present invention is excellent in the sustainability of the antibacterial effect.

1‧‧‧Menstruation

2‧‧‧ front sheet

3‧‧‧Back sheet

4‧‧‧ Absorber

5‧‧‧ Absorptive body

6‧‧‧ side leak-proof sheet

6a‧‧‧Free End

6b‧‧‧Fixed end

7‧‧‧wing

8‧‧‧ antibacterial agent

9‧‧‧ rolling groove

21‧‧‧Second sheet

42‧‧‧back side absorbent sheet

43‧‧‧ Central Absorption Department

43a‧‧‧Upper sheet

43b‧‧‧ underside sheet

43c‧‧‧Intermediate sheet

43s‧‧‧Position of both ends in the width direction of the central absorption portion

44‧‧‧Second area stacking department

45‧‧‧Slit

45S‧‧‧Slit area

46‧‧‧ Super Absorbent Polymer

47‧‧‧thick-walled section

48‧‧‧ fiber material

61‧‧‧The first joint line

62‧‧‧The second joint line

91‧‧‧cross rolling groove

92‧‧‧Longitudinal rolling groove

401‧‧‧ Absorbent sheet

402‧‧‧Central absorbent sheet

A‧‧‧Front

B‧‧‧ Excretion Department Opposition Department

b1‧‧‧bend section

b2‧‧‧bending part

C‧‧‧Rear

D45‧‧‧interval

E‧‧‧Zone 1

e1‧‧‧One edge

e2‧‧‧ the other edge

F‧‧‧Zone 2

L45‧‧‧ length

P‧‧‧Leakproof bag

S1‧‧‧ Top face

S2‧‧‧ the lower face

W45‧‧‧Opening width

X‧‧‧vertical

Y‧‧‧Horizontal

Z‧‧‧ thickness direction

FIG. 1 is a plan view of a menstrual napkin as a preferred embodiment of the absorbent article of the present invention.

FIG. 2 is a plan view showing the skin facing surface side (frontal sheet side) of the absorbent body of the menstrual napkin shown in FIG. 1.

FIG. 3 is a cross-sectional view schematically showing a cross section taken along the line III-III in FIG. 1.

Fig. 4 (a) is a cross-sectional view of the central absorbent portion of the absorbent body provided in the menstrual napkin shown in Fig. 1; The part shows the same cross-sectional view. 4 (a) and 4 (b) are also collectively referred to as FIG. 4.

FIG. 5 is an enlarged cross-sectional view showing a cross-sectional structure in a thickness direction of an absorbent sheet constituting the absorbent body shown in FIG. 4.

Figs. 6 (a) to (d) are cross-sectional views of the absorbent article in the lateral and thickness directions, showing another example of the laminated state of the central absorbent sheet in the central absorbent portion.

Claims (33)

An absorbent article comprising a front sheet forming a liquid-permeable surface facing the skin, a back sheet forming a non-skin facing surface, and an absorbent sheet containing a fiber material between the two sheets Material as an absorber of the constituent member, and having a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, The absorbent body has a laminated structure in at least a central portion of the absorbent body in the lateral direction, and the laminated structure includes a front-side absorbent sheet on the skin-opposing surface side and a back-side absorbent sheet on the non-skin-opposing surface side. And a central absorber located between the two sheets, and The central absorption portion has a first region in a thickness direction and a second region having a higher density of the fiber material than the first region, and an antibacterial agent is disposed in the second region. For example, the absorbent article according to claim 1, wherein the central absorbent portion has a structure in which a plurality of central absorbent sheets are laminated, and the non-skin facing surface side in the thickness direction of the central absorbent portion has a plurality of the second regions. A second region lamination portion that is directly laminated without interposing the first region. In the absorbent article according to claim 2, the antibacterial agent is arranged in the entire area of the second region layered portion in the plan view of the absorbent body. The absorbent article according to claim 1 or 2, wherein the antibacterial agent includes a water-insoluble or water-insoluble antibacterial agent. The absorbent article according to claim 4, wherein the water-insoluble or water-insoluble antibacterial agent is an antibacterial metal load. The absorbent article according to claim 5, wherein the carrier of the antibacterial metal carrier is a hydrophobic porous particle. The absorbent article according to claim 4, wherein the antibacterial agent includes an organic antibacterial agent. The absorbent article according to claim 7, wherein the organic antibacterial agent is a water-insoluble or water-insoluble quaternary ammonium salt. The absorbent article according to claim 4, wherein the above-mentioned water-insoluble or water-insoluble antibacterial agent and water-soluble antibacterial agent are included as the above-mentioned antibacterial agent. The absorbent article according to claim 1 or 2, wherein the central absorbent portion has a structure in which a plurality of central absorbent sheets are laminated, and Content of the said antibacterial agent is 0.001 mass% or more and 12 mass% or less with respect to the total mass of the said central absorbent sheet. The absorbent article according to claim 1 or 2, wherein the central absorption section contains a deodorant. The absorbent article according to claim 11, wherein at least the second region contains the deodorant. The absorbent article according to claim 11, which contains porous particles as the deodorant. The absorbent article according to claim 11, wherein the deodorant includes a pH buffering agent. The absorbent article according to claim 14, wherein the pH buffer includes citric acid and tris (hydroxymethyl) aminomethane. The absorbent article according to claim 1 or 2, wherein the above-mentioned central absorbent portion contains perfume. The absorbent article according to claim 1 or 2, wherein the absorbent body has an area where the front absorbent sheet, the central absorbent sheet constituting the central absorbent section, and the area where the absorbent sheet on the back side overlaps, A slit in the front-side absorbent sheet and reaching the inside of the central absorption portion in the thickness direction. The absorbent article according to claim 17, wherein the longitudinal direction of the slit extends parallel to the longitudinal direction. The absorbent article according to claim 17, wherein the longitudinal length of the slit is 10 mm or more and 35 mm or less. The absorbent article according to claim 17, wherein the slit has an opening width of 1.2 mm or less. The absorbent article according to claim 17, wherein the plurality of the slits are dispersedly arranged in both the longitudinal direction and the lateral direction. The absorbent article according to claim 1 or 2, wherein the first region contains a superabsorbent polymer. The absorbent article according to claim 22, wherein the content of the superabsorbent polymer in the first region is greater than the second region. The absorbent article according to claim 22, wherein the water absorption rate of the superabsorbent polymer is 20 mL / 0.3 g · 30 seconds or less. The absorbent article according to claim 1 or 2, wherein the absorbent body has a thick-walled portion at the portion facing the excretory portion. The absorbent article according to claim 25, wherein the width of the central absorbent portion is less than the full width of the absorbent body. For example, the absorbent article of claim 26, wherein the width of the central absorbent portion is 25% to 75% of the full width of the absorbent body in which the central absorbent portion is present. For example, in the absorbent article according to claim 25, more than 50% of the longitudinal length of the thick-walled portion is present in the facing portion of the excretory portion. For example, the absorbent article according to claim 28, wherein the longitudinal length of the central absorbent portion is 5% to 65% of the total length of the absorbent body in the longitudinal direction. If the absorbent article according to claim 1 or 2, the antibacterial agent is also contained in the first area. The absorbent article according to claim 30, wherein the antibacterial agent contained in the first region is water-insoluble or water-insoluble. The absorbent article according to claim 31, wherein the antibacterial agent contained in the first region is a water-insoluble or water-insoluble quaternary ammonium salt. The absorbent article according to claim 1 or 2, wherein the absorbent article is a menstrual tampon.