CN111801076A - absorbent articles - Google Patents

Abstract

The invention provides an absorbent article (1) which comprises a front sheet (2), a back sheet (3), and an absorbent body (4) disposed between the two sheets, and which has a longitudinal direction (X) and a transverse direction (Y). The absorbent body (4) comprises, as a constituent member, absorbent sheets (401, 402) containing a fibrous material. The absorbent body (4) has a laminated structure including a front side absorbent sheet (41) positioned on the skin-facing surface side, a back side absorbent sheet (42) positioned on the non-skin-facing surface side, and a central absorbent portion (43) positioned between the front side absorbent sheet and the back side absorbent sheet, at least in the central portion of the absorbent body (4) in the lateral direction Y. The central absorption section (43) has a first region (E) and a second region (F) in which the density of the fibrous material is higher than that of the first region (E) in the thickness direction thereof, and the antimicrobial agent (8) is disposed in the second region (F).

Description

absorbent articles

technical field

The present invention relates to an absorbent article.

Background technique

Absorbent articles such as sanitary napkins may cause problems such as an unpleasant odor after absorbing bodily fluids such as menstrual blood, or itching due to contact between the wearer's skin and bodily fluids. In order to eliminate such inconvenience, various studies have been conducted on the antibacterial function of absorbent articles. For example, Patent Document 1 describes an absorbent article having a functional absorber 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 a functional absorber provided at a higher level than the functional absorber. The absorber is on the wearer's side, and the diffusibility of bodily fluids is smaller than that of the wearer's side absorber of this functional absorber. In addition, Patent Document 2 describes an absorbent article including an antibacterial agent-containing antibacterial active sheet in which a low-density portion having a fiber amount of less than 50% by mass relative to the surrounding area is formed. In addition, Patent Document 3 describes an absorbent article in which a functional material region in which a functional material containing an antibacterial agent and a fragrance is arranged is provided between an absorbent layer containing an absorbent material for absorbing bodily fluids and a surface sheet, and formed There is a pressing portion obtained by compressing the functional material region and the adjacent layer in the thickness direction adjacent to the functional material region in the thickness direction.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2010-110443

Patent Document 2: Japanese Patent Application Laid-Open No. 2014-158509

Patent Document 3: Japanese Patent Laid-Open No. 2016-067749

SUMMARY OF THE INVENTION

The present invention is an absorbent article comprising a liquid-permeable front sheet that forms a skin-opposite side, a back sheet that forms a non-skin-opposite side, and an absorbent sheet that is positioned between the two sheets and contains a fibrous material as a The absorbent article constituting the component has a longitudinal direction corresponding to the front-rear direction of the wearer and a transverse direction perpendicular to the longitudinal direction. The said absorber has a laminated structure at least in the center part of the said horizontal direction of this absorber, and this laminated structure includes the front side absorptive sheet on the skin-opposite side, the back-side absorptive sheet on the non-skin-opposite side, and the two. Central absorber between each sheet. The said center absorption part has the 1st area|region and the 2nd area|region whose fiber material density is higher than the 1st area|region in the thickness direction, and the antibacterial agent is arrange|positioned in the said 2nd area|region.

Description of drawings

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

Fig. 2 is a plan view showing the skin-opposing surface side (surface sheet side) of the absorber included in the sanitary 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 absorber included in the sanitary napkin shown in FIG. 1 , and FIG. 4( b ) is a laminated portion of the second region of the central absorbent portion of the absorbent body. The same section view represented by the part filled with black. (a) of FIG. 4 and (b) of FIG. 4 are also collectively referred to as FIG. 4 .

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

(a)-(d) is the cross-sectional view of the absorbent article along the transverse direction and the thickness direction which shows another example of the lamination|stacking method of the center absorbent sheet of the center absorption part.

Detailed ways

Although the absorbent articles described in Patent Documents 1 to 3 are provided with 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 there is a risk of causing bad odor. Worry about skin problems such as itching or itching.

Therefore, the technical problem of the present invention is to provide an absorbent article which can eliminate the above-mentioned defects of the prior art.

Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment.

As shown in FIGS. 1 and 3 , a sanitary napkin 1 (hereinafter, also referred to as a sanitary napkin 1 ) as an embodiment of the present invention includes a liquid-permeable topsheet 2 that forms a skin-opposing surface, and a non-skin-forming surface sheet 2 . The opposite back sheet 3 and the liquid-retaining absorber 4 arranged between the two sheets 2 and 3 . The surface sheet 2, the absorber 4, and the back surface sheet 3 are integrated, and the absorptive main body 5 is comprised. The side leak-proof sheet 6 is arrange|positioned at the surface sheet 2 side of the both sides of the longitudinal direction of the absorptive main body 5.

The side leakage preventing sheet 6 has a free end 6a that is not joined to the front sheet 2, and a fixed end 6b that is joined to the front sheet 2 as the inner end of the joining line 61. When in use, the fixed end 6b and the free end 6a are between the fixed end 6b and the free end 6a. The space is separated from the surface sheet 2 to form a leak-proof bag P that prevents leakage to the side. On the surface of the non-skin opposing surface side of the absorptive main body 5, a main body adhesive portion (not shown) for fixing to the crotch portion of the shorts is provided. Moreover, the sanitary napkin 1 has a pair of wing parts 7 extended from the side edge of the absorptive main body 5 to the outer side of the horizontal direction on both sides of the vertical direction X. On the surface of the pair of wings 7 on the side of the back sheet 3, a wing adhesive portion (not shown) for fixing to the non-skin facing surface of the crotch portion of the shorts is provided.

As the surface sheet 2 , the back sheet 3 , and the side leakage preventing sheet 6 , various sheets and the like conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a nonwoven fabric of a single layer or a multilayer structure, an apertured film, or the like can be used. The surface sheet 2 may be a sheet having unevenness on the skin-opposing surface side, or may be a sheet to which an oil agent or the like for controlling hydrophilicity is adhered to the surface of the constituent fibers. When the topsheet 2 has a multilayer structure, as the topsheet 2, a concave-convex sheet having a first fiber layer located on the side close to the wearer's skin and a layer located farther from the wearer's skin is used. In the second fiber layer on the side, the two fiber layers are integrated in the thickness direction by a plurality of joints formed locally, and the part of the first fiber layer located between the joints is formed to protrude in a convex shape. The convex portion of the above-mentioned concave-convex shape. As the concave-convex sheet in which the convex portion is a solid structure, for example, the concave-convex sheet described in Japanese Patent Application Laid-Open No. 2007-182662 or Japanese Patent Application Laid-Open No. 2002-187228 can be used. As the back sheet 3, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. As the back sheet 3, a liquid-impermeable (including impermeable liquid) or a water-repellent sheet can be used, and a moisture-permeable resin film or the like is also preferably used. As the side leakage preventing sheet 6, 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.

As shown in FIG. 1 , the sanitary napkin 1 has an excretion part opposing part B including an excretion position part which is arranged to face the wearer's liquid excretion part when worn; The front part A of the side), and the rear part C arrange|positioned rather than this excretion part opposing part B on the back side (rear side) of a wearer.

The sanitary napkin 1 and the absorptive main body 5 have a longitudinal direction X corresponding to the front-rear direction of the wearer, and a transverse direction Y perpendicular to the longitudinal direction X. That is, the sanitary napkin 1 and the absorptive main body 5 are divided into the front part A, the excretion part opposing part B, and the rear part C in this order in the longitudinal direction X. In the following description, unless otherwise specified, the vertical direction X is the vertical direction X of the absorbent article or the direction along the vertical direction X of the absorbent article of its constituent members, and the horizontal direction Y is the horizontal direction Y of the absorbent article or its configuration The direction of the component in the transverse direction Y of the absorbent article. The constituent members of the absorbent article also include parts of the absorbent article including a plurality of constituent members, such as an absorbent main body or a central absorbent part described below.

In the absorbent article of the present invention, the skin-facing surface is the surface of the absorbent article or its constituent members that faces the wearer's skin side when the absorbent article is worn, and the non-skin-facing surface is the absorbent article or its constituent member's face. The surface facing the opposite side (usually the clothing side) from the skin side when the absorbent article is worn. In the absorbent article of the present invention, the excretion portion opposing portion B refers to a region having wings in the longitudinal direction X of the absorbent article when it has wings 7 like the sanitary napkin 1 of the present embodiment ( The area sandwiched by the root of one wing in the longitudinal direction X and the root of the other wing in the longitudinal direction X). Moreover, when an absorbent article does not have a wing part, the center area|region when the whole length of the longitudinal direction X of an absorbent article is divided into three equal parts and divided into three areas becomes the excretion part opposing part B.

In the sanitary napkin 1, the surface sheet 2 covers the whole area of the skin-opposing surface side of the absorber 4, and the back sheet 3 covers the entire area of the non-skin-opposing surface side of the absorber 4. The extension portions of the front sheet 2 and the back sheet 3 extending from both end edges in the longitudinal direction X of the absorber 4 are joined to each other. In addition, the portions of the back sheet 3 and the side leakage preventing sheet 6 extending outward in the lateral direction Y from both side edges of the absorber 4 in the longitudinal direction X are joined to each other. In this way, the absorber 4 is sandwiched by the topsheet 2 and the backsheet 3 , and the topsheet 2 or the side leakage preventing sheet 6 and the backsheet 3 are joined over the entire circumference of the outer edge of the sanitary napkin 1 . Any joining means, such as an adhesive agent, heat sealing, ultrasonic sealing, etc., can be used for joining between the sheets which comprise the sanitary napkin 1. In addition, in the example shown in FIG. 1 , the pair of side leakage preventing sheets 6 and 6 are respectively located at the first joining line 61 in the shape of a curved line located in the opposite portion B of the excretion portion and in the longitudinal direction X of the first joining line 61 . The front and rear zigzag line-shaped second joining lines 62 are joined to the topsheet 2, but the side leakage preventing sheets 6 and the topsheet 2 may be joined at a linear joining line that is continuous over the entire length of the absorber 4. engage.

In the sanitary napkin 1, as shown in FIG. 3, the 2nd sheet|seat 21 which consists of a nonwoven fabric is arrange|positioned between the surface sheet 2 and the absorber 4. The second sheet 21 is preferably such that its width (length in transverse direction Y) is shorter than the width (length in transverse direction Y) of the absorber 4, and preferably the length in longitudinal direction X is longer than the length in longitudinal direction X of the absorber 4, and it extends throughout the sanitary napkin. It is arranged along the full length of the vertical X. The second sheet 21 is a sheet that is also called a sub-layer sheet in this technical field and is separate from the top sheet 2 and the absorber 4, and is connected to the top sheet 2 and/or the top sheet 2 and/or by an adhesive or the like provided in a strip or spiral shape. The absorber 4 is partially joined. The 2nd sheet|seat 21 is a sheet|seat which plays the role of improving the permeability|transmittance of liquid from the surface sheet 2 to the absorber 4, or reducing the liquid return to the surface sheet 2 of the liquid absorbed in the absorber 4.

Moreover, the absorbent article for menstrual blood absorption of this invention may not have the said 2nd sheet|seat.

As shown in FIG. 3 , the absorber 4 includes, as constituent members, absorbent sheets 401 and 402 containing a fibrous material, and in this embodiment, has a laminate structure in which a plurality of absorbent sheets are laminated. More specifically, in the excretion part opposing part B, at least the center part of the horizontal direction Y of the absorber 4 has a laminated structure including the front side absorbent sheet 41 located on the skin opposing surface side, and the non-skin opposing surface side. The back side absorbent sheet 42 and the central absorbent part 43 located between the two sheets.

As shown in FIG. 2 , the central absorbent portion 43 of the sanitary napkin 1 is arranged only in the central portion in the lateral direction Y of the absorber 4 in the excretion portion opposing portion B, but the central absorbent portion 43 of the present invention is only required to be in the thickness direction Z of the absorber 4 What is necessary is just to arrange|position between the front side absorptive sheet 41 and the back side absorptive sheet 42, and it may have the width|variety over the whole width (total width) of the absorber 4. In addition, although the center absorption part 43 of the sanitary napkin 1 is arrange|positioned in only a part of the longitudinal direction of the absorber 4 as shown in FIG. . In addition, in FIG. 2, code|symbol 43s, 43s shows the position of the both ends edge of the width direction of the center absorption part 43.

As shown in FIG.3 and FIG.4(a), the center absorption part 43 of this embodiment has the structure in which the center absorption sheet 402 is laminated|stacked in multiple layers. The center absorption part 43 may have a single-layer structure in which the center absorptive sheet 402 is not laminated|stacked.

As shown in FIGS. 3 and 4( a ), the central absorbent portion 43 of the sanitary napkin 1 has a structure in which the central absorbent sheet 402 is stacked in multiple layers by folding one central absorbent sheet 402 . The central absorbent sheet 402 of the central absorbent portion 43 is folded and folded at two folded portions b1 and b2 spaced apart in the lateral direction Y of the absorber 4 to form a three-layer laminate structure. More specifically, the center absorbent sheet 402 is bent toward the back sheet 3 side at the first bending portion b1 counted from one end edge e1 along the vertical direction X of the center absorbent sheet 402, and is folded toward the back sheet 3 from the one end edge e1. The second bending part b2 is folded in a spiral shape as a whole so that the other end edge e2 on the opposite side of the above-mentioned one end edge e1 is arranged in the interior of the three-layer laminated structure.

The center absorbent sheet 402 is folded in this way to form the upper side sheet 43a located on the skin-opposite side of the laminate structure of the center absorbent sheet 402, that is, the top sheet 2 side, and the back sheet located on the non-skin-opposite side of the laminate structure. The lower side piece 43b on the third side, and the intermediate piece 43c located between the two pieces 43a, 43b. In the central absorption part 43 shown in Fig. 4 , the upper surface S1 is the surface facing the skin-opposing surface side, that is, the surface sheet 2 side, and the lower surface S2 is the surface that faces the non-skin-opposing surface side, that is, the back surface sheet 3 side. noodle.

On the other hand, the front side absorbent sheet 41 is arranged on the skin-opposing surface side of the central absorbent portion 43 , and covers the entire area on the skin-opposing surface side of the central absorbent portion 43 , and the back-side absorbent sheet 42 is arranged on the central absorbent portion 43 . The non-skin-opposing surface side of the center absorbent portion 43 covers the entire area of the non-skin-opposing surface side. The front side absorptive sheet 41 and the back side absorptive sheet 42 may be separate sheets, but in the present embodiment, the center portion in the width direction of one wide main body absorptive sheet 401 constitutes the front side absorptive sheet 41. The portion of the main body absorbent sheet 401 located on the side of the non-skin opposing surface of the absorber 4 constitutes the back side absorbent sheet 42 . In the example shown in FIG. 3 , the main absorbent sheet 401 is bent toward the non-skin-opposing surface side at both end portions of the absorber 4 in the lateral direction, and the portion extending from the bent portion to the inner side in the lateral direction of the absorber 4 The front end portions are stacked on each other.

As shown in FIG. 5, the center absorptive sheet 402 which comprises the center absorption part 43 has the 1st area|region E and the 2nd area|region F whose density of the fiber material 48 is higher than the 1st area|region E in the thickness direction of a sheet|seat. The 1st area|region E and the 2nd area|region F are spread over the whole area|region of the direction parallel to the surface of the center absorbent sheet 402. The first region E and the second region F may be stacked in layers so that the boundary between the first region E and the second region F is clearly defined, or one fiber material 48 may enter the other fiber material at the boundary between the two. 48 of the inter-fiber space, etc., the interface between the two becomes unclear.

The main body absorbent sheet 401 in the sanitary napkin 1 of the present embodiment has the same configuration 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 fiber material 48 contained in the center absorbent sheet 402 and the main body absorbent sheet 401 include a fiber material obtained by hydrophilizing a hydrophobic fiber, and a hydrophilic fiber that is itself hydrophilic. In particular, a fibrous material which itself is hydrophilic and has water retention is preferable. As hydrophilic fibers, natural fibers, cellulose-based regenerated fibers, or semi-synthetic fibers can be cited as preferred examples. Examples of hydrophilic fibers having water retention include cellulose fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. Cellulosic fibers may be used alone or in combination of two or more. Examples of the raw material pulp of the cellulose-based fibers include wood pulp such as coniferous kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp and straw pulp. As the cellulose-based fibers, cross-linked cellulose fibers (pulp fibers) obtained by intramolecular or intermolecular cross-linking of cellulose with an appropriate cross-linking agent, or rayon having an increased crystallinity of cellulose can also be used Fiber and other regenerated cellulose fibers, etc.

The center absorbent sheet 402 and the main body absorbent sheet 401 may contain both cellulose-based fibers and synthetic fibers such as thermoplastic fibers, or may contain synthetic fibers such as thermoplastic fibers instead of cellulose-based fibers. As the thermoplastic fiber, for example, a single fiber formed by using a single synthetic resin such as polyethylene, polypropylene, polyester, and polyurethane, or a composite fiber formed by using a synthetic resin such as a composite of two or more of these can also be used, for example Core-sheath type and side-by-side type conjugate fibers formed of two or more types of synthetic resins are used.

As shown in FIG. 1, in the sanitary napkin 1, the center absorbent sheet 402 is arrange|positioned from the excretion part opposing part B to a part of the rear part C in the longitudinal direction. Therefore, the part where the center absorptive sheet 402 is arrange|positioned becomes the large thickness part 47 in which the thickness of the absorber 4 is large compared with the periphery. Therefore, in the part where the center absorptive sheet 402 is arrange|positioned, the absorber 4 becomes easy to stick closely to the wearer's skin side at the time of wearing.

Regarding each of the center absorbent sheet 402 and the main body absorbent sheet 401, as a configuration in which the second region F having a higher density than the first region E is provided, for example, the entire area that overlaps the first region E in the thickness direction can be mentioned. A configuration in which the second region F is provided in different regions, or a configuration in which the second region F is partially provided so as to partially overlap with the first region E in the thickness direction, or the like. In the sanitary napkin 1 of this embodiment, both the center absorbent sheet 402 and the main body absorbent sheet 401 are provided with the second region F over the entire region overlapping the first region E in the thickness direction.

Whether or not the absorbent sheet has the first region E and the second region F in which the density of the fiber material is different from each other can be determined, for example, by the following method.

[Method for Measuring Density of Fiber Material]

Using a microscope (for example, "VHX-1000" manufactured by KEYENCE Corporation) or a scanning electron microscope (for example, JCM-5100 manufactured by JEOL Ltd.), the thickness direction of the absorbent sheet (nonwoven fabric) or the absorber is cut. Zoom in and observe the cut surface, and obtain image data of the cut surface. The magnification at the time of observation is a magnification of such an extent that about 10 to 70 fiber cross sections can be observed, and is usually a magnification of 20 to 200 times. In the observation field of the cross section, the area occupied by fibers per fixed field area (0.02 mm ² ) was measured by image analysis. Specifically, for the obtained image, using image processing software such as ImageJ, a threshold value is set at the luminance boundary between the fiber and the portion where the fiber does not exist, and the luminance is binarized. In general, when white and black are binarized, the fibers are white, and the portion where no fibers are present is black. Therefore, in the thickness direction of the absorbent sheet, an area with many white portions can be recognized as the first The second area F, the area with more black parts is identified as the first area E. Then, the area with white and the area with black within the above-mentioned fixed visual field area (0.02 mm ² ) were calculated respectively, converted into the area of the fiber per unit area (1 mm ² ), and set as the density of the fiber material (mm ^{2 )} . /mm ² ). However, the measurement of the density of this fiber material was performed at each arbitrary three places of the 1st area|region E and the 2nd area|region F of an absorbent sheet, and the average value was made into the fiber density of a sample.

Regarding the center 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, and more preferably the density of the fiber material in the first region E measured by the same method. 2 times or more, preferably 10 times or less, more preferably 7 times or less, and preferably 1.2 times or more and 10 times or less, and more preferably 2 times or more and 7 times or less.

An absorbent sheet refers to an absorbent body molded into a sheet shape, and is generally different from an absorbent body of a structure obtained by stacking an absorbent material. Typical examples of the absorbent sheet include the absorbent sheet described in Japanese Patent No. 2963647, the absorbent sheet described in Japanese Patent No. 2955223, and the like. As the absorbent sheet, it is possible to preferably polymerize constituent fibers or superabsorbents by using the adhesive force generated by the superabsorbent polymer in a wet state, or a separately added adhesive or a binder such as an adhesive fiber. A sheet-like absorbent sheet or the like is formed by bonding between the material and the constituent fibers. In addition, as the absorbent sheet, an absorbent sheet containing pulp produced by the method described in Japanese Patent Laid-Open No. 8-246395 can be used; A dry sheet fixed with an adhesive (eg vinyl acetate-based adhesive, PVA (polyvinyl alcohol, polyvinyl alcohol), etc.); hot-melt adhesive is applied between paper or non-woven fabric containing pulp, etc. An absorbent sheet obtained by post-spraying a superabsorbent polymer; an absorbent sheet obtained by blending a superabsorbent polymer in a spunbond or meltblown nonwoven fabric manufacturing process, and the like. These absorbent sheets can be used as a sheet-like absorber by cutting one sheet into a predetermined shape.

The central absorbent portion 43 of the absorber 4 in the sanitary napkin 1 has a structure in which the central absorbent sheet 402 is laminated in three layers as described above, and thus the first region E in which the density of the fibrous material is relatively low is opposite to the density of the fibrous material. The higher second region F is formed from the skin-opposing surface side toward the non-skin-opposing surface side in the thickness direction Z of the central absorbent part 43, and the first region E, the second region F, the first region E, and the second region F are generated in this order. , the second area F, and the first area E. Moreover, the part filled with black of FIG.4(b) becomes the 2nd area|region lamination part 44 in which the 2nd area|region F with a relatively high density of fibrous material is directly laminated|stacked without the 1st area|region E interposed therebetween. The 2nd area|region lamination part 44 of the center absorption part 43 shown to FIG.4(a) and FIG.4(b) consists of the 2nd area|region F of the intermediate sheet 43c, and the 2nd area|region F of the lower side sheet 43b.

In the absorber 4 of the sanitary napkin 1, the antimicrobial agent 8 is arrange|positioned in the 2nd area|region F of the center absorbent sheet 402 which comprises the center absorption part 43. More specifically, the antibacterial agent 8 is arrange|positioned in the 2nd area|region F in the whole area|region of the direction parallel to the surface of the sheet|seat of the center absorptive sheet 402. 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 the two second regions constituting the second region lamination portion 44 are provided with the antibacterial agent 8. The antibacterial agent 8 is arrange|positioned in both of the 2nd area|region F, ie, the 2nd area|region F of the intermediate sheet 43c, and the 2nd area|region F of the lower side sheet 43b.

The sanitary napkin 1 of the present embodiment is used by being fixed to the crotch of shorts or the like like a normal sanitary napkin.

According to the sanitary napkin 1 of the present embodiment, since the excretion part opposing part B has the central absorption part 43 at least in the center part in the lateral direction Y of the absorber 4, the absorber 4 is in close contact with the wearer's excretion part, and the sanitary napkin 1 During wearing, the body fluid supplied from the skin-opposing surface side is quickly absorbed into the central absorption portion 43 . The central absorbent sheet 402 constituting the central absorbent portion 43 is located in the excretion portion facing portion B, and has a first region E where the density of the fiber material is relatively low and a second region F where the density of the fiber material is relatively high, so that bodily fluids are easily absorbed. Guided and maintained in the second area F. Moreover, since the center absorption part has the front side absorptive sheet on the skin-opposing surface side, the bodily fluid introduced into the center absorption part is hard to return to the wearer's skin. Furthermore, since the antibacterial agent 8 is arranged in the second region F, the bodily fluid absorbed in the center absorbent part 43 can stably contact the antibacterial agent 8 for a long period of time immediately after being discharged in the second region F of the center absorbent sheet 402 . Therefore, the antibacterial effect of the antibacterial agent can be effectively utilized.

Since the above-mentioned high antibacterial effect is obtained by arranging the antibacterial agent in the center absorber 43 , for example, the antibacterial agent may not be disposed over the entire absorber 4 . Therefore, even a relatively small amount of the antibacterial agent can obtain an excellent antibacterial effect, and can effectively suppress the generation of malodor caused by bacteria and the occurrence of other problems caused by bacteria for a long time. In particular, as long as the absorber 4 is manufactured without applying the antibacterial agent to the front side absorbent sheet 41, the antibacterial agent is not easily transferred to the skin of the wearer, so that the antibacterial agent does not easily come into contact with the inherent bacteria existing on the skin of the wearer, Therefore, the usability becomes good.

Moreover, in the sanitary napkin 1 of this embodiment, as mentioned above, the center absorption part 43 has the 2nd area|region lamination|stacking part 44, and the antibacterial agent 8 is arrange|positioned in the 2nd area|region F which comprises this 2nd area|region lamination part 44. The second region lamination portion 44 is a portion where the second region F with a high density of fibrous material overlaps. Therefore, the amount of the antibacterial agent 8 per unit area of the second region lamination portion 44 is larger than that of the second region lamination portion 44 . , the probability of body fluids coming into contact with antimicrobials immediately after excretion increases. In addition, since the antibacterial agent is contained in the region surrounded by the region where the fiber material has high density and high liquid retention, even after absorption of the bodily fluid, the bodily fluid and the antibacterial agent 8 are less likely to cause leakage from the second region lamination portion 44 . move. Therefore, the contact frequency between the body fluid in the second region lamination part 44 and the antibacterial agent 8 can be easily maintained high, and the antibacterial effect is excellent in continuity. Therefore, for example, the following effects can be obtained: (1) the antibacterial effect can be exhibited for a long time even with a small amount of the antibacterial agent; (2) the reduction of the target bacterial species for obtaining the antibacterial effect is difficult to occur; (3) the maintenance of the antibacterial effect is unpleasant for a long time. odor production inhibiting effect.

The above-mentioned effect can be exhibited only when the antibacterial agent is arranged in one of the two second regions F constituting the second region lamination part 44, but it is more preferable to configure the first region as shown in the sanitary napkin 1 of the present embodiment. The antibacterial agent 8 is arranged on both sides of the two second regions F of the two-region lamination portion 44 . Moreover, it is preferable to arrange|position an antibacterial agent in the 2nd area|region F of the skin opposing surface side at least among two 2nd area|regions F which comprise the 2nd area|region lamination|stacking part 44 from the viewpoint of the sustainability of an antibacterial effect.

Moreover, in the sanitary napkin 1 of this embodiment, the antibacterial agent 8 is arrange|positioned in the whole area|region of the 2nd area|region lamination part 44 in the planar view of the absorber 4.

If the antibacterial agent 8 is arranged in the entire area of the second region lamination portion 44 in the plan view of the absorber 4, after repeated discharge of bodily fluids, the area in contact with the antibacterial agent 8 increases even after the bodily fluids are diffused in the sanitary napkin 1. , the body fluid can be brought into contact with the antibacterial agent 8 in a wider range. By bringing the body fluid into contact with the antibacterial agent in a wider range, an excellent effect of producing an antibacterial effect on more body fluids can be obtained.

From the viewpoint of increasing the contact area with bodily fluids and enhancing the antibacterial effect, the antibacterial agent 8 is preferably distributed over the entire second region F in the direction parallel to the surface of the center absorbent sheet 402 . The grammage of the antibacterial agent 8 can be appropriately determined according to the type of the antibacterial agent, and as an example, 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 or less, It is more preferably 3.0 g/m ² or less, and more preferably 0.005 g/m ² or more and 5.0 g/m ² or less, and 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 for antibacterial use in absorbent articles such as sanitary napkins can be used without particular limitation. For example, antibacterial metals, antibacterial metal carriers, organic antibacterial agents, etc. are mentioned.

Examples of the metal having antimicrobial properties include copper, silver, gold, lead, nickel, tin, zinc, iron, and zirconium.

Examples of the antibacterial metal carrier include silver zeolite, divinylbenzene-2-vinylpyridine-2-vinylpyridine silver copolymer (described in, for example, JP-A-2006-307404 ), aluminum/ Silver/sodium nitrosilicate (described in, for example, Japanese Patent Laid-Open No. 2005-232654), silica/zinc oxide/alumina composites (specifically, antibacterial supported on silver or zinc) Water-insoluble or water-insoluble antibacterial agents such as metal-substituting cannonite minerals), silver zirconium phosphate, and silver/zinc zeolite mixtures.

As the organic antibacterial agent, a quaternary ammonium salt is preferable, and among them, poorly water-soluble benzalkonium chloride, benzalkonium cetyl phosphate, and the like are appropriately mentioned.

The sanitary napkin 1 preferably contains a water-insoluble or poorly water-soluble antibacterial agent as an antibacterial agent. When the following poorly water-soluble or water-insoluble antibacterial agent is used as the antibacterial agent, the antibacterial agent can be inhibited from moving to other parts. Therefore, by maintaining the concentration of the antibacterial agent in the second region F or the second region lamination part 44, etc., the antibacterial agent can be The durability of the effect is further improved. As examples of the poorly water-soluble or water-insoluble antibacterial agent, the above-mentioned antibacterial metal support is preferable. Here, the term that the antibacterial metal carrier is poorly water-soluble or water-insoluble means that even if the supported metal is water-soluble, the antibacterial metal-supporting carrier (preferably porous particles) is poorly water-soluble or water-insoluble. water insoluble.

Moreover, in this invention, since the antibacterial agent 8 is mix|blended with the 2nd area|region F in which the density of the fiber material of the center absorbent sheet 402 is relatively high, it becomes easy to hold|maintain a bodily fluid in the 2nd area|region F. Therefore, since the movement of the antibacterial agent 8 from the second region F to other members can be suppressed, a water-soluble antibacterial agent can also be used. In particular, when the antibacterial agent 8 is blended in the second region F constituting the second region lamination part 44 , the movement of the antibacterial agent from the second region F to other members can be suppressed more effectively.

Here, the so-called antibacterial agent is poorly water-soluble means that the solubility per 100 g of ion-exchanged water at 25°C is less than 20 g, and the solubility of the poorly water-soluble antibacterial agent in ion-exchanged water at 25°C is preferably 10 g or less. Preferably it is 1 g or less. In addition, in this specification, when the said solubility is 0.1 g or less, it is set as water insolubility. In addition, in this specification, little water solubility and water insolubility may be collectively referred to as a general concept of little water solubility. On the other hand, the term that the antibacterial agent is water-soluble means that the solubility in ion-exchanged water at 25°C is 20 g or more, and the solubility of the water-soluble antibacterial agent in ion-exchanged water at 25°C is preferably 40 g or more, and more preferably 50 g or more. .

The above-mentioned solubility can be measured by the following method. 100 g of ion-exchanged water at 25° C. added to a 200-mL beaker was put into a fully dried measurement object (antibacterial agent), a stirring blade with a length of 20 mm and a width of 7 mm was put in, and a magnetic stirrer was used to stir at 600 rpm. The previous input amount that did not dissolve in 1 hour was taken as the solubility of the antibacterial agent in water at 25°C. Among them, as a magnetic stirrer, HPS-100 manufactured by AS ONE Co., Ltd., etc. can be used.

In addition, the content of the antibacterial agent 8 is preferably 0.001 mass % or more, more preferably 0.01 mass % or more, and preferably 12 mass % or less with respect to the total mass of the central absorbent sheet 402 constituting the central absorbent portion 43 of the absorber 4 , more preferably 5 mass % or less, and preferably 0.001 mass % or more and 12 mass % or less, more preferably 0.01 mass % or more and 5 mass % or less.

In the absorbent article of the present invention, it is preferable that the absorber 4 contains a deodorant, and it is particularly preferable that the center absorbent sheet 402 constituting the center absorber 43 contains a deodorant. By blending a deodorant with the absorber 4 and/or the center absorbent sheet 402, the generation of an unpleasant odor caused by bacteria can be more effectively suppressed by combining with an antibacterial agent.

When the center absorbent sheet 402 contains a deodorant, only the first region E may contain the deodorant, only the second region F may contain the deodorant, or the first and second regions E and F may contain the deodorant. Both of them contain the deodorant, and it is preferable that at least the second region F contains the deodorant. Antibacterial agents have effects such as suppressing the generation of odors caused by bacteria, and deodorants are expected to suppress odors that are not caused by bacteria or odors that occur before the antibacterial agents act. By the presence of the deodorant in the central absorbing part 43, particularly in the second region F, the escape of odor from the skin-opposing surface side and the non-skin-opposing surface side of the absorbent article can be effectively suppressed.

As a deodorant, it is a substance that itself acts directly on odors (odorous substances), that is, can adsorb, neutralize, decompose, etc. odors (odorous substances) to exhibit a deodorizing effect, and can be used in the A substance widely used for deodorizing purposes in the technical field. Examples of the deodorant used in the present invention include porous particles and water-soluble pH buffers.

The porous particles used as deodorants refer to particles having a plurality of pores at least on the surface of the particles and capable of capturing, adsorbing and/or encapsulating volatilized odor components in the 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. Synthetic porous polymers; natural porous polymers such as chitin and chitosan; zinc oxide, activated carbon, silica, silica (silica), calcium silicate, aluminosilicate compounds, high silica zeolite ( Hydrophobic zeolite), sepiolite, cannonite, zeolite, and metal-supported porous materials such as inorganic porous substances such as hydrated zirconia, etc., it is preferable to contain at least one selected from these. The odor components derived from excretions such as urine and menstrual blood to be deodorized are a mixture of various components such as ammonia, amines, fatty acids, hydrogen sulfide, and mercaptans. In general, since the molecular size of these odor components is 1 nm or more, by using porous particles having an average pore diameter of 2 nm or more as a deodorant, various odor components can be effectively 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 viewpoint of the adsorption effect of odor and the difficulty in adsorbing aroma components volatilized from the following fragrances, and the difficulty in deteriorating and reducing the aroma, the peak value of the pore diameter of the porous particles is preferably smaller than the size of the aroma components, preferably 0.1 μm or less, More preferably, it is 0.04 μm or less, and preferably 0.005 μm or more. The peak value of the pore diameter of the porous particles was measured by the following method.

<Measuring method of peak value of pore diameter of porous particles>

The peak value of the pore diameter of the porous particles can be measured by a multipoint method using liquid nitrogen using a pore distribution measuring apparatus (Nippon bel Co., Ltd., trade name: BELSORP mini II). Let the peak top in the pore distribution be the peak of the pore diameter. The measurement sample was subjected to a pretreatment of heating at 110° C. for 1 hour.

In addition, the water-soluble pH buffer is an agent that neutralizes acidic or basic odor components generated in a liquid phase such as excretory fluid, and reduces the change in pH. That is, it is a neutralizing deodorant utilizing a balancing action. Such a reagent is not particularly limited, and examples thereof include weak acids or their conjugate bases, or their mixtures or salts, weak bases or their conjugate acids, or their mixtures or their salts. Specific examples of the water-soluble pH buffer include citric acid and the like as weak acids, and metal salts such as Na, K, and Ca as salts thereof. Moreover, as a weak base, polyhydroxyamine compounds, such as tris (hydroxymethyl) aminomethane, etc. are mentioned, for example.

In particular, in the sanitary napkin 1 of the present embodiment, it is preferable to contain citric acid and tris(hydroxymethyl)aminomethane as a pH buffer. By the combination of weak acid and weak base components like these, not only the generation of odors derived from acidic and basic odor components, but also deodorants including only the use of pH buffering properties can be strongly suppressed. The production of odors, including odors near neutral, cannot be suppressed. As a result, in the absorbent article 1 using the absorbent body 4 containing these pH buffers, even when the absorbent body 4 is worn for a long time, it is possible to realize that the wearer's surroundings are hardly noticed from the excretory fluid. Higher deodorizing effect of the degree of odor.

Moreover, in the said deodorant, the porous particle can carry|support an antimicrobial or bactericidal metal. In this case, the porous particles have both the properties of a deodorant and an antibacterial agent. In the sanitary napkin 1, it is preferable to contain the porous particle which supports an antimicrobial metal in an absorbent article.

Regarding the absorbent article of the present invention, the absorber 4 may contain fragrance. It is preferable that the absorber 4 contains the fragrance|flavor in the center absorption part 43, ie, the center absorbent sheet 402, and it is more preferable to contain the fragrance|flavor in the 2nd area|region F located in the thickness direction inside of the center absorption part 43. In the manufacturing process of an absorber, it is preferable to supply a fragrance|flavor from the 2nd area|region F side of the center absorbent sheet 402. In this case, if the center absorbent sheet 402 is stacked so that the second regions face each other, excessive volatilization of the fragrance to other parts can be suppressed, and the fragrance exists in the central absorbent sheet at a high concentration It is preferable because it is easy to maintain until the start of use.

By arranging the fragrance in the center absorbent sheet 402 located in the thickness direction, excessive volatilization of the fragrance can be suppressed, and the continuation of the odor masking effect can be further improved. From the same viewpoint, it is preferable to mix the fragrance|flavor of the quantity more than the 1st area|region E in the 2nd area|region F of the center absorbent sheet 402.

As a fragrance|flavor, the fragrance|flavor which has a green herbal aroma described in Unexamined-Japanese-Patent No. 2007-244764, the extract of a plant, the extract of citrus, etc. are mentioned, for example.

The content of the fragrance is not particularly limited, and can be appropriately set according to the type of fragrance and the like. For example, the content of the fragrance in the center absorbent sheet 402 in the unfolded 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 preferably contain the superabsorbent polymer 46, respectively, and the central absorbent sheet 402 and the main absorbent sheet 401 having the first region and the second region are preferably located in the first region E, respectively. The superabsorbent polymer 46 is contained in an amount greater than that of the second region F. In particular, when the water absorption rate of the superabsorbent polymer arranged in the first region is 20 mL/0.3 g·30 sec or less, further 15 mL/0.3 g·30 sec or less, and further 10 mL/0.3 g·30 sec or less, the Most or all of the excreted bodily fluid is preferably absorbed and retained by the superabsorbent polymer 46 in the first region E before the first region E is absorbed and retained and after the second region is in contact with the antibacterial agent. In addition, the lower limit value of the water absorption rate should just 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, the antibacterial agent is in contact with The latter body fluid is easily absorbed and held by the first region E in an appropriate manner, which is preferable in terms of suppressing fluid leakage.

The water absorption rate of the superabsorbent polymer was measured by the following method.

<Measurement method of water absorption rate>

The water absorption rate (unit: mL/0.3 g·30 sec) obtained by the DW method was measured using an apparatus (Demand Wettability Tester) generally known as an apparatus for implementing the DW method. Specifically, in this apparatus, the liquid level of the physiological saline was set to a water level equal to the surface of the polymer dispersion table [70 mmφ, the table on which the No. 2 filter paper was placed on the glass filter No. 1], and the 0.3 g of the superabsorbent polymer to be measured was spread on the surface of the polymer spreader. The water absorption amount at the time point when the superabsorbent polymer was sprayed was set to 0, and the water absorption amount after 30 seconds was measured. The amount of water absorption was measured by the scale of the burette indicating the amount of decrease in the water level of the physiological saline. The value of the obtained water absorption amount was taken as the water absorption speed obtained by the DW method. The water absorption rate obtained by the DW method can be designed by the shape, particle diameter, bulk specific gravity, degree of crosslinking, and the like of the superabsorbent polymer. However, the measurement was performed at 23±2° C. and humidity of 50±5%, and the sample was stored in the same environment for 24 hours or more before the measurement.

As the superabsorbent polymer 46, a particulate superabsorbent polymer is generally used, but a fibrous superabsorbent polymer may be used. In the case of using a particulate superabsorbent polymer, its shape may be any shape of spherical, block, bag or indeterminate. As the superabsorbent polymer, generally, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid can be used. Examples thereof include polyacrylic acid and salts thereof, and polymethacrylic acid and salts thereof. As the polyacrylate or polymethacrylate, sodium salt can be preferably used. In addition, maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acryloylethanesulfonic acid, 2-hydroxy (meth)acrylic acid can also be used. A copolymer obtained by copolymerizing a comonomer such as ethyl ester or styrene sulfonic acid with acrylic acid or methacrylic acid within a range that does not reduce the performance of the superabsorbent polymer.

As a thickness per absorbent sheet, 0.1 mm or more is preferable, 0.3 mm or more is especially preferable, 2 mm or less is preferable, and 1.5 mm or less is especially preferable. More specifically, it is preferably 0.1 mm or more and 2 mm or less, particularly preferably 0.3 mm or more and 1.5 mm or less, in terms of obtaining an absorbent article having sufficient liquid diffusibility, liquid retention and good wearing feeling.

The absorbent sheet having the first region and the second region used in the sanitary napkin 1 of the present embodiment can be individually produced, for example, by any method such as a wet papermaking method or a dry papermaking method. After the first fiber sheet in the first region and the second fiber sheet in the second region, they are combined with an adhesive, a binder fiber, the adhesive force of the swollen superabsorbent polymer, and the like to be integrated. change. As a preferable example of the manufacturing method of an absorptive sheet, the fiber sheet of a wet state is formed by a wet papermaking method, a superabsorbent polymer is spread|dispersed on this fiber sheet, and it is made into a wet state 1st fiber sheet. Then, the second fiber sheet in the dry state is stacked on the surface side of the first fiber sheet in the wet state on which the superabsorbent polymer is dispersed to obtain a laminated sheet. Next, the laminated sheet is dried by a drying section such as a Yankee dryer to obtain an intended absorbent sheet. There is no particular limitation on the method of providing a density difference in the fiber material between the first fiber sheet and the second fiber sheet. For example, in the production process of the second fiber sheet, the pressurizing pressure of the pressurizing section after papermaking is higher than that of the first fiber sheet. A method for a fiber sheet; a method for forming a first fiber sheet to have a lower density than a second fiber sheet by making the material or thickness of the constituent fibers of each fiber sheet different; in one of the first fiber sheet and the second fiber sheet Or both are the drying part of the laminated sheet in a wet state, the method of arranging the second sheet on the side of the Yankee dryer and drying; or a method of combining two or more of these. The center absorptive sheet 402 used for the sanitary napkin 1 of the present embodiment can be manufactured by applying an antibacterial agent in the manufacturing process of the second fibrous sheet that becomes the second region, and then to the first region that becomes the first region. The fiber sheets are combined and integrated. Examples of the method of applying the antibacterial agent to the second fiber sheet side include: a method of applying a solution or dispersion containing an antibacterial agent to the second fiber sheet before bonding; coating the surface of the composite sheet on the second fiber sheet side A method of heating or naturally drying a solution or dispersion containing an antibacterial agent; a method of scattering or blowing particles to the composite sheet from the second fiber sheet side. Examples of methods for applying the solution or dispersion containing the antibacterial agent include methods using known liquid coating apparatuses such as spray method, transfer method, die coating, gravure coating, ink jet method, screen printing, and the like.

Moreover, the absorber 4 of the sanitary napkin 1 of this embodiment has the large thickness part 47 which has the center which consists of the center absorptive sheet 402 with the front side absorptive sheet 41 and the back side absorptive sheet 42 sandwiched therebetween. The absorptive sheet of 5 layers in total formed by the absorption part 43. The large thickness part 47 is formed in the center part of the horizontal direction Y of the absorber 4, and is mainly formed in the excretion part opposing part B in the vertical direction X of the absorber 4. As shown in FIG. Mainly formed in the excretion part opposing part B means that the large thickness part 47 exists in the excretion part opposing part B by 50% or more of the total length of the longitudinal direction. By having the large thickness portion 47 in the width direction central portion of the absorber 4 that is smaller than the overall width of the absorber 4, a large amount of bodily fluids excreted in the width direction central portion can be efficiently absorbed into the central absorbent portion 43, Since the 2nd area|region F in the center absorption part 43 contacts with an antibacterial agent efficiently, it can suppress generation|occurence|production of an unpleasant smell by bacteria more effectively. From this viewpoint, the width of the central absorbent portion 43 is preferably 25% or more, more preferably 40% or more, and preferably 75% of the total width of the absorber 4 in the longitudinal direction X where the central absorbent portion 43 is present Hereinafter, it is more preferably 60% or less, and it is preferably 25% or more and 75% or less, and more preferably 40% or more and 60% or less. From the same viewpoint, the length in the vertical direction X of the central absorbent portion 43 is preferably 5% or more, more preferably 15% or more, and preferably 65% or less, more preferably 5% or more of the total length of the absorber 4 in the vertical direction X. It is 55% or less, and preferably 5% or more and 65% or less, and more preferably 15% or more and 55% or less.

The thickness of the absorber 4 in the large thickness portion 47 is preferably 0.7 mm or more, more preferably 1 mm or more, and more preferably 5 mm or less, more preferably 4 mm or less, more specifically, 0.7 mm or more and 5 mm or less, still more preferably It is 1 mm or more and 4 mm or less. By setting the thickness of the large-thickness portion 47 to such a range, it is easy to simultaneously achieve a good wearing feeling, high absorption performance, and high antibacterial effect of the excretory portion opposing portion B. Moreover, when an absorbent article has a wing part like the sanitary napkin 1 of this embodiment, it becomes easy to suppress wrinkling of the absorber of the excretion part opposing part at the time of wearing. In addition, the thickness of the portion other than the large thickness portion 47 of the absorber is preferably 0.3 mm or more, more preferably 0.5 mm or more, and preferably 3 mm or less, further preferably 2.5 mm or less, and more specifically, preferably 0.3 mm or more. and 3 mm or less, more preferably 0.5 mm or more and 2.5 mm or less. This range is preferable from the viewpoints of realizing high absorption performance and improving the followability to the movements of the wearer. However, the thickness of an absorber and an absorbent sheet is measured by the following method.

<Measurement method of thickness of absorbent sheet and absorber>

The absorbent sheet or the absorbent body as the object to be measured was placed in a horizontal place without wrinkling or bending, and the thickness under a load of 5 cN/cm ² was measured. For the measurement of the thickness in the present invention, a thickness gauge PEACOCK DIALUPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) was used. At this time, a circular or square plate (acrylic resin plate with a thickness of about 5 mm) is arranged between the front end of the thickness gauge and the measurement part of the object to be measured, and the load of the plate is adjusted so that the load becomes 5 cN/cm ² . size.

In the sanitary napkin 1 of the present embodiment described above, as shown in FIGS. 2 and 3 , the absorber 4 is provided with the slit 45 extending parallel to the vertical direction X in the excretion part opposing portion B of the absorber 4 . Therefore, in the sanitary napkin 1 of this embodiment, the longitudinal direction of the slit 45 is parallel to the longitudinal direction X. Through the slits 45 , the menstrual blood reaching the absorber 4 becomes easy to spread in the longitudinal direction X, and also becomes easy to permeate in the thickness direction of the absorber 4 . In the sanitary napkin 1, as shown in FIG. 2, the slit 45 extended in the longitudinal direction X has the slit area|region 45S of the state which was formed in the state dispersed in both the longitudinal direction X and the transverse direction Y. The slit region 45S in which the plurality of slits 45 are arranged extends not only over the excretion portion opposing portion B, but also over a portion of the front portion A and a portion of the rear portion C.

The slit 45 is formed by making a cut in the absorbent sheet.

The slits 45 , especially the slit regions 45S in which the slits 45 are dispersedly arranged, are arranged in a state of overlapping with all the regions where the front side absorbent sheet 41 , the central absorbent portion 43 and the back side absorbent sheet 42 of the absorber 4 are stacked. , the slit 45 opens following the movement of the wearer's body, and quickly guides bodily fluids to the central absorbent portion 43 to which the antibacterial agent is applied, and is different from the opening formed by cutting out a part of the absorbent sheet in plan view, the central absorbing The antibacterial agent in the part 43 or the body fluid moved into the center absorbing part 43 is less likely to 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 penetrating through all the absorbent sheets from the front side absorbent sheet 41 to the back side absorbent sheet 42, or may be a non-penetrating hole which does not penetrate all the absorbent sheets. It is preferable that the slit 45 penetrates the front side absorptive sheet 41, and reaches the inside of the thickness direction of the center absorption part 43. As an example, in addition to the slits 45 penetrating all the absorbent sheets mentioned above, the slits that reach the second region F of the upper sheet 43a of the central absorbent part but do not reach the first region E of the intermediate sheet 43c can be mentioned; or The 2nd area|region of the intermediate sheet 43c of a center absorption part does not reach the slit etc. of the 1st area|region E of the lower side sheet 43b.

The opening width W45 of the slit 45 on the surface sheet 2 side is preferably 1.2 mm or less, more preferably 1.0 mm or less, and still more preferably 0.5 mm or less. In addition, if the slit 45 is formed by a slit, the lower limit value of the opening width W45 is substantially 0 mm, and may be about 0.01 mm. Further, the distance D45 between the slits 45 and 45 in the lateral direction Y is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.5 mm or less, still more preferably 1.2 mm or less, and more specifically, preferably 0.1 mm It is more than 1.5 mm and less than or equal to 1.5 mm, and more preferably, it is more than 0.2 mm and less than or equal to 1.2 mm. The opening width W45 of the slit 45 of the absorber 4 is measured by the following method.

<Method for Measuring Opening Width of Slot 45>

The opening width of the slit 45 is measured by taking out the absorber 4 from the sanitary napkin 1, placing the taken absorber 4 horizontally, and adjusting the measurement magnification and magnification with a digital microscope VHX-1000 manufactured by Keyence.

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

In the sanitary napkin 1, between the surface sheet 2 and the absorber 4, and between the absorber 4 and the back sheet 3, it is preferable to apply an adhesive and fix them. In addition, the layers of the laminated absorbent sheets constituting the absorber 4 may or may not be adhered, but from the viewpoint of wrinkling and displacement of the absorber during use, it is preferably joined by an adhesive.

The adhesive can be applied using a known mechanism, for example, using a slot coating gun, a spiral spray gun, a spray gun, or a spot gun, and in the sanitary napkin 1, it is preferable to apply it in a spiral shape using a spiral spray gun. As the adhesive to be applied, 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 slits 45 in the absorber 4 as shown in the sanitary napkin 1, the laminated body of the absorbent sheet may be partially cut by a known cutting mechanism. A cutting roll for a plurality of cutting knives extending in the circumferential direction and a backup roll for receiving the knives of the cutting roll are formed on the circumferential surface of the roll so as to be dispersed in the circumferential direction and the axial length direction of the roll.

As shown in FIGS. 1 and 3 , the sanitary napkin 1 of the present embodiment has, on the skin-opposing surface of the absorptive main body 5 , a linear pressing groove 9 in which the topsheet 2 and the absorber 4 are integrally recessed toward the backsheet 3 side. The pressing groove 9 is a groove in which both the surface sheet 2 and the absorber 4 are recessed, and the density of each fiber as a constituent member in the surface sheet 2 and the absorber 4 is higher than that of the groove peripheral portion. The pressing groove may be a continuous line or a discontinuous line such as a dotted line, for example, may be formed by a row formed by a plurality of discontinuous point embossing. The sanitary napkin 1 has longitudinal pressing grooves 92 extending in the longitudinal direction X on both sides of the excretion part opposing portion B, respectively, and lateral pressing grooves 91 extending in the lateral direction Y in the front portion A and the rear portion C, respectively. When the absorber 4 is viewed from above, the vertical pressing grooves 92 are provided on both sides of the lateral direction Y of the central absorbent portion 43 containing the antibacterial agent, so that the expansion of the body fluid in the lateral direction Y is suppressed to prevent leakage, and the bodily fluid is collected into the antibacterial agent-containing It is preferable from the point of the center absorption part 43. In addition, when the absorber 4 is viewed from above, the antibacterial agent-containing central absorber 43 has lateral pressing grooves 91 at the front and rear of the longitudinal direction X to suppress the diffusion of bodily fluids in the front and rear directions to prevent leakage and prevent the wrinkling of the sanitary napkin. preferred. The absorbent article of the present invention may not have any one or both or all of the longitudinal compression grooves 92 and the transverse compression grooves 91 .

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the physiological absorbent article of this invention is not limited at all by the sanitary napkin 1 of the said embodiment, It can change suitably.

For example, either or both of the front-side absorbent sheet 41 and the back-side absorbent sheet 42 may not have a first region with a relatively low density of the fiber material and a second region with a relatively high density of the fiber material.

In addition, the lamination system of the center absorbent sheet of the center absorption part is not limited to the system shown in FIG. 4, A various lamination system can be employ|adopted.

The lamination form of the center absorbent sheet may be, for example, the form shown in FIGS. 6( a ) to 6 ( d ). The center absorbent portion 43 shown in FIG. 6( a ) is formed by folding the center absorbent sheet 402 having the first region E and the second region F containing the antibacterial agent in half along the folded portion b1 in the longitudinal direction of the absorbent article. Forming. The center absorbent part 43 shown in FIG.6(b) is the center absorbent sheet 402 which has the 1st area|region E and the 2nd area|region F containing an antibacterial agent along two bending parts b1 of the longitudinal direction of an absorbent article , B2 is bent and folded into a three-fold state. The center absorbent part 43 shown in FIG.6(c) is formed by overlapping the two center absorbent sheets 402 having the first region E and the second region F containing the antibacterial agent in a state in which the second region F is in surface contact. of. In the center absorption part 43 shown to FIG.6(a)-FIG.6(c), the 2nd area|region lamination part 44 in which the 2nd area|region F is laminated|stacked directly without interposing the 1st area|region E is formed.

The center absorbent part 43 shown in Fig. 6(d) is formed by orienting the two center absorbent sheets 402 having the first region E and the second region F containing the antibacterial agent so that the second region F faces the non-skin-opposing surface side, respectively. formed by stacking. Regarding the central absorbent portion 43 shown in FIGS. 6( a ) to 6 ( d ) and the central absorbent sheet 402 constituting the central absorbent portion 43 , within the range that is not particularly contradictory, the features of the sanitary napkin 1 of the above-described embodiment can be appropriately applied. Description of the center absorption part 43 and the center absorptive sheet 402. For example, in the central absorber 43 shown in FIGS. 6( a ) to 6 ( d ), from the viewpoint of improving the sustainability of the antibacterial effect of the antibacterial agent, it is preferable to locate the central absorber 43 in the thickness direction as well. The antibacterial agent is arranged in the second region F inside Z, and in the central absorption part 43 shown in FIGS. When either one or both of them are placed with an antibacterial agent, the antibacterial agent or bodily fluids are less likely to move to other sites, and the concentration of the antibacterial agent and the continuation of the antibacterial effect are improved, which is preferable. In FIGS. 6( a ) to 6 ( d ), similarly to FIG. 4 , the upper side in the figure is the skin-opposing surface side, and the lower side in the figure is the non-skin-opposing surface.

The number of laminations of the central absorbent sheet 402 of the central absorbent portion 43 is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, more preferably 5 or less, and preferably 2 or more and 7 or less, and more preferably 3 more than 5 and less than 5.

In addition, regarding the absorber 4, from the viewpoint of the absorption capacity and absorption speed at the time of discharge of bodily fluids, and the absence of discomfort when wearing, the front side absorbent sheet 41, the back side absorbent sheet 42, and the center of the center absorbent portion 43 are formed. The total number of laminations of the absorbent sheet 402 is preferably 3 or more, more preferably 5 or more, and preferably 10 or less, more preferably 7 or less, and preferably 3 or more and 10 or less, and more preferably 5 or more and 7 or less.

In addition, in the sanitary napkin 1 of the above-described embodiment, the antibacterial agent is disposed in the second region F of the center absorbent sheet 402 constituting the center absorbent portion 43, and the first region E may or may not contain the antibacterial agent. . When the first region E contains an antibacterial agent, the antibacterial agent of the same type as the antibacterial agent in the second region F may be contained as the antibacterial agent. Furthermore, as an antibacterial agent arrange|positioned in the 1st area|region E, the antibacterial agent of the quaternary ammonium salt which is water-insoluble or poorly water-soluble is preferable among them. In the first region, since the fiber density is lower than that in the second region, the antibacterial agent of the ionic quaternary ammonium salt, which is water-insoluble or poorly water-soluble, is also dispersed in the body fluid, and it is easy to move together with the body fluid to a relatively high fiber density. Higher second area F. By moving the antibacterial agent together with the body fluid, the concentration of the antibacterial agent in the second region F increases, and high antibacterial performance can be exhibited. At this time, as shown in the sanitary napkin 1, when the first region E is located on the most skin-opposing surface side and has the second region F on the non-skin-opposing surface side, a part of the bodily fluid is held in a highly absorbent The first region E of the absorbent polymer, and bodily fluids containing organic substances such as proteins that are not easily absorbed by the superabsorbent polymer are easily guided to the second region F with a relatively dense fiber density. Therefore, it is possible to effectively suppress the generation of odors derived from organic substances in the second region F, which is an environment in which a high concentration of the antibacterial agent is present. In addition, at this time, by making the antibacterial agent in the first region E water-insoluble or poorly water-soluble, all the antibacterial agent does not move to the second region F and remains easily, so it is possible to prevent the antibacterial agent from being held in the first region. E. The production of odor of organic matter present in body fluids.

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

Regarding the embodiment of the present invention described above, the following absorbent articles are further disclosed.

<1> An absorbent article comprising a liquid-permeable front sheet that forms a skin-opposing surface, a back sheet that forms a non-skin-opposing surface, and an absorbent sheet that is positioned between the two sheets and contains a fibrous material as a The absorber constituting the component has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction perpendicular to the longitudinal direction, and the absorber has a laminated structure at least in the center of the lateral direction of the absorber, and the laminated structure includes a layer located on the skin. A front side absorbent sheet on the opposite side, a back side absorbent sheet on the non-skin-opposite side, and a central absorbent portion located between the two sheets, the central absorbent portion having a first region and fibers in the thickness direction thereof The density of the material is higher than that of the second region of the first region, and the antibacterial agent is arranged in the second region.

<2> The absorbent article according to the above <1>, wherein the central absorbent portion has a structure in which a central absorbent sheet is laminated in multiple layers, and has a plurality of layers on the non-skin-opposing surface side in the thickness direction of the central absorbent portion. The second region lamination portion obtained by directly stacking the second regions without interposing the first regions therebetween.

<3> The absorbent article according to the above <2>, wherein the antibacterial agent is arranged over the entire region of the second region lamination part in a plan view of the absorber.

<4> The absorbent article according to any one of the above <1> to <3>, which contains a water-insoluble or poorly water-soluble antibacterial agent as the antibacterial agent.

<5> The absorbent article according to the above <4>, wherein the water-insoluble or poorly water-soluble antibacterial agent is an antibacterial metal carrier.

<6> The absorbent article according to the above <5>, wherein the carrier of the antibacterial metal carrier is a hydrophobic porous particle.

<7> The absorbent article according to any one of the above <4> to <6>, which contains an organic antibacterial agent as the antibacterial agent.

<8> The absorbent article according to the above <7>, wherein the organic antibacterial agent is a water-insoluble or poorly water-soluble quaternary ammonium salt.

<9> The absorbent article according to any one of the above <4> to <8>, wherein as the antibacterial agent, the above-mentioned water-insoluble or poorly water-soluble antibacterial agent is contained, and a water-soluble antibacterial agent is contained.

<10> The absorbent article according to any one of the above <1> to <9>, wherein the central absorbent part has a structure in which central absorbent sheets are laminated in multiple layers, and the content of the antibacterial agent is relative to the central absorbent The total mass of the flexible sheet is 0.001 mass % or more and 12 mass % or less, preferably 0.01 mass % or more and 5 mass % or less.

<11> The absorbent article according to any one of the above-mentioned <1> to <10>, wherein the central absorption part contains a deodorant.

<12> The absorbent article according to the above <11>, wherein at least the second region contains the deodorant.

<13> The absorbent article according to the above <11> or <12>, which contains porous particles as the deodorant.

<14> The absorbent article according to any one of the above <11> to <13>, which contains a pH buffer as the deodorant.

<15> The absorbent article according to the above <14>, which contains citric acid and tris(hydroxymethyl)aminomethane as the pH buffer.

<16> The absorbent article according to any one of the above <1> to <15>, wherein the central absorption part contains a fragrance.

<17> The absorbent article according to any one of the above <1> to <16>, wherein the absorber absorbs in the front absorbent sheet, the central absorbent sheet constituting the central absorbent portion, and the back side The area|region where the elastic sheet overlaps has the slit which penetrates the said front side absorptive sheet, and reaches the inside of the thickness direction of the said center absorption part.

<18> The absorbent article according to the above <17>, wherein the longitudinal direction of the slit extends parallel to the longitudinal direction.

<19> The absorbent article according to the above <17> or <18>, wherein the longitudinal length of the slit 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 opening width of the slit is 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 the above-mentioned <17> to <20>, wherein the plurality of the slits are dispersedly arranged in both the vertical direction and the horizontal direction.

<22> The absorbent article according to any one of the above <1> to <21>, wherein the first region contains a superabsorbent polymer.

<23> The absorbent article according to the above <22>, wherein the content of the superabsorbent polymer in the first region is greater than the content in the second region.

<24> The absorbent article according to the above <22> or <23>, wherein the superabsorbent polymer has a water absorption rate of 20 mL/0.3 g·30 seconds or less, preferably 2 mL/0.3 g·30 seconds or more and 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 the above <1> to <24>, wherein the absorber has a large thickness portion in the excretion portion opposing portion.

<26> The absorbent article according to the above <25>, wherein the width of the central absorbent portion is smaller than the overall width of the absorber.

<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 of the total width of the absorber in the portion where the central absorbent portion is present, preferably 40% or more and 60% or less.

<28> The absorbent article according to any one of the above <25> to <27>, wherein 50% or more of the longitudinal full length of the large thickness portion is present in the excretion portion opposing portion.

<29> The absorbent article according to the above <28>, wherein the length of the longitudinal direction of the central absorbent portion is 5% or more and 65% or less of the total length of the absorber in the longitudinal direction, preferably 15% or more and 55% or less.

<30> The absorbent article according to any one of the above <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 poorly water-soluble.

<32> The absorbent article according to the above <31>, wherein the antibacterial agent contained in the first region is a water-insoluble or poorly water-soluble quaternary ammonium salt.

<33> The absorbent article according to any one of the above <1> to <32>, wherein the absorbent article is a sanitary napkin.

Industrial Availability

According to the absorbent article of the present invention, the durability of the antibacterial effect is excellent.

Claims (33)

1. An absorbent article comprising a liquid-permeable front sheet forming a skin-opposite face, a back sheet forming a non-skin-opposing face, and an absorbent sheet positioned between these two sheets and comprising a fibrous material as a composition An absorbent body of a component, the absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a transverse direction perpendicular to the longitudinal direction, the absorbent article is characterized by: The absorber has a laminated structure at least at the center portion of the lateral direction of the absorber, and the laminated structure includes a front-side absorbent sheet located on the skin-opposite side, a back-side absorbent sheet located on the non-skin-opposite side, and The central absorber between these two sheets, The said central absorption part has the 1st area|region in the thickness direction, and the 2nd area|region whose fiber material density is higher than the 1st area|region, and the antibacterial agent is arrange|positioned in the said 2nd area|region. 2. The absorbent article of claim 1, wherein: The said center absorption part has the structure in which the center absorption sheet is laminated|stacked in multiple layers, and has a plurality of said 2nd area|regions on the non-skin-opposing surface side of the thickness direction of the said center absorption part without interposing the said 1st area|region. And the second region lamination part that is directly laminated. 3. The absorbent article of claim 2, wherein: This antibacterial agent is arrange|positioned in the whole area|region of the said 2nd area|region lamination|stacking part in the planar view of the said absorber. 4. The absorbent article according to any one of claims 1 to 3, wherein: The antibacterial agent includes a water-insoluble or poorly water-soluble antibacterial agent. 5. The absorbent article of claim 4, wherein: The water-insoluble or poorly water-soluble antibacterial agent is an antibacterial metal carrier. 6. The absorbent article of claim 5, wherein: The carrier of the antibacterial metal carrier is hydrophobic porous particles. 7. The absorbent article according to any one of claims 4 to 6, wherein: As the antibacterial agent, an organic antibacterial agent is contained. 8. The absorbent article of claim 7, wherein: The organic antibacterial agent is a water-insoluble or poorly water-soluble quaternary ammonium salt. 9. The absorbent article according to any one of claims 4 to 8, wherein: As the antibacterial agent, the water-insoluble or poorly water-soluble antibacterial agent is contained, and a water-soluble antibacterial agent is also contained. 10. The absorbent article according to any one of claims 1 to 9, wherein: The said central absorbent part has a structure in which a central absorbent sheet is laminated in multiple layers, 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 center absorbent sheet. 11. The absorbent article according to any one of claims 1 to 10, wherein: The said central absorption part contains deodorant. 12. The absorbent article of claim 11, wherein: At least the second region contains the deodorant. 13. The absorbent article of claim 11 or 12, wherein: As the deodorant, porous particles are contained. 14. The absorbent article according to any one of claims 11 to 13, wherein: As the deodorant, a pH buffer is contained. 15. The absorbent article of claim 14, wherein: As the pH buffer, citric acid and tris(hydroxymethyl)aminomethane were included. 16. The absorbent article according to any one of claims 1 to 15, wherein: The central absorber contains fragrance. 17. The absorbent article according to any one of claims 1 to 16, wherein: The said absorber penetrates the said front side absorptive sheet, and has the area|region where the said front side absorptive sheet, the center absorptive sheet which comprises the said center absorption part, and the said back side absorptive sheet are overlapped, and has penetrated the said front side absorptive sheet, and reached the said center A slit in the thickness direction of the absorption part. 18. The absorbent article of claim 17, wherein: The longitudinal direction of the slit extends parallel to the longitudinal direction. 19. The absorbent article of claim 17 or 18, wherein: The longitudinal length of the slit is 10 mm or more and 35 mm or less. 20. The absorbent article according to any one of claims 17 to 19, wherein: The opening width of the slit is 1.2 mm or less. 21. The absorbent article according to any one of claims 17 to 20, wherein: The plurality of slits are distributed in both the longitudinal direction and the transverse direction. 22. The absorbent article according to any one of claims 1 to 21, wherein: The first region contains a superabsorbent polymer. 23. The absorbent article of claim 22, wherein: The content of the superabsorbent polymer in the first region is greater than that in the second region. 24. The absorbent article of claim 22 or 23, wherein: The water absorption rate of the superabsorbent polymer is 20 mL/0.3 g·30 seconds or less. 25. The absorbent article according to any one of claims 1 to 24, wherein: The said absorber has a large thickness part in the excretion part opposing part. 26. The absorbent article of claim 25, wherein: The width of the central absorbent portion is smaller than the overall width of the absorbent body. 27. The absorbent article of claim 26, wherein: The width of the said center absorption part is 25% or more and 75% or less of the total width of the absorber of the part where this center absorption part exists. 28. The absorbent article according to any one of claims 25 to 27, wherein: 50% or more of the longitudinal full length of the large thickness portion is present in the excretion portion opposing portion. 29. The absorbent article of claim 28, wherein: The length of the said longitudinal direction of the said center absorption part is 5% or more and 65% or less of the total length of the absorber in the said longitudinal direction. 30. The absorbent article according to any one of claims 1 to 29, wherein: Antibacterial agents are also contained in the first region. 31. The absorbent article of claim 30, wherein: The antibacterial agent contained in the first region is water-insoluble or poorly water-soluble. 32. The absorbent article of claim 31, wherein: The antibacterial agent contained in the first region is a water-insoluble or poorly water-soluble quaternary ammonium salt. 33. The absorbent article of any one of claims 1 to 32, wherein: The absorbent article is a sanitary napkin.

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