TWI805711B - absorbent article - Google Patents

Abstract

The present invention is an absorbent article (1) comprising a front sheet (2), a back sheet (3) and an absorber (4) arranged between the two sheets, and has a longitudinal direction (X) and a transverse direction (Y). The absorbent body (4) includes absorbent sheets (401), (402) containing fibrous materials as constituent members. The absorber (4) has a laminated structure at least in the central part of the horizontal direction Y of the absorber (4), and the laminated structure includes a front-side absorbent sheet (41) on the side facing the skin, and an absorbent sheet (41) on the side not facing the skin. The back side absorbent sheet (42) and the central absorbent portion (43) located between these two sheets. The central absorbent portion (43) has 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) in its thickness direction, and an antibacterial agent is arranged in the second region (F) (8).

Description

absorbent article

The present invention relates to an absorbent article.

Absorbent articles such as menstrual sanitary napkins may produce unpleasant odor after absorbing menstrual blood and other body fluids, or cause itching and other troubles 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 that has a functional absorbent body that includes a functional material that provides at least an additional function such as an antibacterial function in the central part of the absorbent article, and that is placed on a side that is relatively functional. The absorbent body is on the wearer's side and has a lower diffusibility of bodily fluids than the wearer's side absorbent body of the functional absorbent body. In addition, Patent Document 2 discloses an absorbent article including an antibacterial agent-containing antibacterial active sheet in which a low-density portion in which the amount of fibers is less than 50% by mass compared with 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 body fluids and a front sheet, and A rolled portion obtained by compressing the functional material region and an adjacent layer adjacent to the functional material region in the thickness direction in the thickness direction is formed.

prior art literature patent documents

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

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

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

The present invention is an absorbent article comprising a liquid-permeable front sheet forming a skin-facing surface, a back sheet forming a non-skin-facing surface, and an absorbent sheet comprising a fibrous material between the two sheets. The flexible sheet is used as an absorber constituting a member, and has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction perpendicular to the longitudinal direction. The above-mentioned absorber has a laminated structure at least at the central part of the above-mentioned transverse direction of the absorber, and the laminated structure includes a front-side absorbent sheet on the side facing the skin, and a back-side absorbent sheet on the non-skin-facing side. And the central absorbent portion located between the two sheets. The central absorbent portion has a first region in its thickness direction and a second region having a higher fiber material density than the first region, and an antibacterial agent is disposed in the second region.

1: Menstrual sanitary napkins

2: front sheet

3: Back sheet

4: Absorber

5: Absorbent 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 part

43a: upper side sheet

43b: Lower side sheet

43c: intermediate sheet

43s: The position of the two edges in the width direction of the central absorbent part

44:Second area lamination department

45: Slit

45S: Slit area

46: super absorbent polymer

47: Thick wall part

48: Fiber material

61: 1st bonding wire

62: 2nd bonding wire

91: Horizontal rolling groove

92: Longitudinal rolling groove

401: Body absorbent sheet

402: Central absorbent sheet

A: front part

B: The part opposite to the excretory part

b1: bending part

b2: bending part

C: Rear part

D45: Interval

E: Area 1

e1: one edge

e2: the other edge

F: second area

L45: length

P: leakproof bag

S1: the surface of the upper side

S2: The lower side

W45: opening width

X: Vertical

Y: Horizontal

Z: Thickness direction

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

Fig. 2 is a plan view showing the skin-facing side (front sheet side) of the absorber included in the menstrual sanitary napkin shown in Fig. 1 .

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

Fig. 4(a) is a cross-sectional view of the central absorbent part of the absorbent body of the menstrual sanitary napkin shown in Fig. 1, and Fig. 4(b) is a layered part of the second region of the central absorbent part of the absorbent body filled with black The same cross-sectional view as shown in the part. FIG. 4( a ) and FIG. 4( b ) are also collectively referred to as FIG. 4 .

Fig. 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 .

6( a ) to ( d ) are cross-sectional views of an absorbent article showing another example of the laminated state of the central absorbent sheet of the central absorbent portion along the lateral direction and the thickness direction.

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

Therefore, the object of the present invention is to provide an absorbent article that 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 Figures 1 and 3, a menstrual sanitary napkin 1 (hereinafter also referred to as a sanitary napkin 1) as one embodiment of the present invention is provided with a liquid-permeable front sheet 2 forming a skin-facing surface, forming a non-skin The back sheet 3 on the opposite side and the liquid-retaining absorber 4 disposed between the two sheets 2,3. The top sheet 2, the absorber 4, and the back sheet 3 are integrated to form the absorbent main body 5. Side leak-proof sheets 6 are arranged on the sides of the front sheet 2 on both sides in the longitudinal direction of the absorbent main body 5 .

The side leak-proof 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 inside end of the front sheet 2 as the joint line 61. When in use, the fixed end 6b is connected to the free end 6b. The ends 6a are separated from the front sheet 2 to form a leak-proof bag P that prevents side leakage. On the non-skin-facing side of the absorbent body 5, a body adhesive portion (not shown) for fixing to the crotch of the shorts is provided. In addition, the sanitary napkin 1 has a pair of wings 7 extending from the side edge of the absorbent main body 5 to the outside in the lateral direction on both sides of the sanitary napkin 1 in the longitudinal direction X. On the side of the back sheet 3 side of the pair of wings 7, a wing adhesive part (not shown) for fixing to the non-skin-facing side of the crotch of the shorts is provided.

As the front sheet 2, the back sheet 3, and the side leak-proof sheet 6, there are no special Various sheets and the like previously used for absorbent articles such as menstrual tampons are limitedly used. For example, as the top sheet 2, a single-layer or multi-layer nonwoven fabric, an apertured film, or the like can be used. The surface sheet 2 may have irregularities on the side facing the skin, or may have an oil agent for controlling hydrophilicity attached to the surface of the constituent fibers. When the front sheet 2 has a multi-layer structure, as the front sheet 2, use the following concave-convex sheet, which has the first fiber layer on the side close to the wearer's skin and the first fiber layer on the side away from the wearer's skin. 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 between the plurality of joints is convexly raised to form the above-mentioned The convex part of the concave-convex shape. As the concave-convex sheet 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 laminate of a resin film and a nonwoven fabric or the like can be used. The back sheet 3 is liquid-impermeable (including impervious to liquid) or water-repellent, preferably a moisture-permeable resin film. As the side leakproof sheet 6, a laminated nonwoven fabric with high water pressure resistance, a laminate 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-facing portion B including an excretion position portion disposed opposite to the liquid excretion portion of the wearer when worn, and is disposed on the abdomen of the wearer than the excretion-opposing portion B. A front part A on the side (front side), and a rear part C arranged on the back side (rear side) of the wearer relative to the part B facing the excretion part.

The sanitary napkin 1 and the absorbent main body 5 have a longitudinal direction X corresponding to the wearer's front-back direction and a transverse direction Y perpendicular to the longitudinal direction X. That is, the sanitary napkin 1 and the absorbent main body 5 are divided into a front part A, an excretory part facing part B, and a rear part C sequentially in the longitudinal direction X. In the following descriptions, unless otherwise specified, the longitudinal X refers to the longitudinal X of the absorbent article or the direction along the longitudinal X of the absorbent article, and the transverse direction Y refers to the transverse Y of the absorbent article or its composition. absorbent article The horizontal Y direction. The constituent members of an absorbent article also include parts of an absorbent article including a plurality of constituent members, such as an absorbent main body or a central absorbent portion described below.

In the absorbent article of the present invention, the skin-facing side is the side of the absorbent article or its constituents that faces the wearer's skin when the absorbent article is worn, and the non-skin-facing face is the absorbent article or its constituents The side facing the side opposite to the skin side (usually the clothing side) when the absorbent article is worn. In the absorbent article of the present invention, the part B facing the excretion part means a region having the wing part in the longitudinal direction X of the absorbent article when the sanitary napkin 1 of the present embodiment has the wing part 7 ( 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). Moreover, when an absorbent article does not have a wing part, normally, when dividing the full length of the vertical direction X of an absorbent article into three equal parts and dividing it into three regions, the central region becomes the excretion part facing part B.

In the sanitary napkin 1 , the front sheet 2 covers the entire area of the skin-facing side of the absorber 4 , and the back sheet 3 covers the entire area of the non-skin-facing side of the absorber 4 . The extended portions of the front sheet 2 and the back sheet 3 from both end edges in the longitudinal direction X of the absorber 4 are joined to each other. Also, portions of the back sheet 3 and the side leak-proof sheets 6 extending from both side edges in the longitudinal direction X of the absorber 4 toward the outer sides in the transverse direction Y are joined to each other. In this way, the absorber 4 is sandwiched between the top sheet 2 and the back sheet 3, and the top 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 joining of the sheets constituting the sanitary napkin 1 uses an arbitrary joining means such as an adhesive, heat sealing, and ultrasonic sealing. Furthermore, in the example shown in FIG. 1 , a pair of side leak-proof sheets 6, 6 are respectively positioned at the curved line-shaped first joint line 61 at the part B facing the excretion part and between the first joint line 61. The second zigzag linear joining line 62 in the longitudinal direction X is joined to the front sheet 2, but the side leakproof sheet 6 and the front side may also be joined to the front sheet 6 at a linear joining line continuous throughout the entire length of the absorber 4. Sheet 2 is joined.

In the sanitary napkin 1, as shown in Fig. 3, a A second sheet 21 made of non-woven fabric is placed. The second sheet 21 is preferably shorter in width (the length in the transverse direction Y) than that of the absorber 4 (the length in the transverse direction Y), and preferably has a length in the longitudinal direction X that is longer than the length in the longitudinal direction X of the absorber 4, and spreads over Sanitary napkins are arranged in the vertical direction X the full length. The second sheet 21 is a sheet that is different from the front sheet 2 and the absorber 4 and is also called a sub-layer sheet in this technical field. The sheet 2 and/or the absorber 4 are partially bonded. The second sheet 21 is a sheet that plays a role of improving the permeability of liquid from the top sheet 2 to the absorber 4 or reducing the return of liquid absorbed into the absorber 4 to the top sheet 2 .

In addition, 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 absorbent sheets 401 and 402 containing fibrous materials as constituent members, and in this embodiment, has a laminated structure in which a plurality of absorbent sheets are laminated. More specifically, in the part B facing the excretion part, at least in the central part of the horizontal direction Y of the absorber 4, there is a laminated structure including the front side absorbent sheet 41 on the side facing the skin, and the absorbent sheet on the non-skin side. The back side absorbent sheet 42 on the facing side and the central absorbent portion 43 located between these two sheets.

The central absorbent part 43 of the sanitary napkin 1 is only arranged in the central part of the horizontal direction Y of the absorbent body 4 at the part B facing the excretion part as shown in FIG. What is necessary is just to be arrange|positioned between the front side absorbent sheet 41 and the back side absorbent sheet 42, and it may have the width|variety over the full width of the absorber 4. Also, the central absorbent portion 43 of the sanitary napkin 1 is disposed only in a part of the longitudinal direction of the absorbent body 4 as shown in FIG. In addition, in FIG. 2, code|symbol 43s, 43s has shown the position of the both ends of the width direction of the central absorption part 43. As shown in FIG.

As shown in Figure 3 and Figure 4(a), the central absorption portion 43 of this embodiment has a laminated There are multiple layers of the central absorbent sheet 402 structure. The central absorbent portion 43 may have a single-layer structure in which the central absorbent sheet 402 is not laminated.

As shown in FIG. 3 and FIG. 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 one central absorbent sheet 402 . The central absorbent sheet 402 of the central absorbent portion 43 forms a three-layer laminated structure by bending and folding at two bending portions b1 and b2 spaced apart in the transverse direction Y of the absorber 4 . More specifically, the central absorbent sheet 402 is bent toward the back sheet 3 at the first bending portion b1 counted from one end edge e1 of the central absorbent sheet 402 in the longitudinal direction X, The second bending part b2 counted from e1 is bent 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 arranged inside the three-layer laminated structure, and the whole is folded into a swirl. shape.

By folding the central absorbent sheet 402 in this manner, the upper sheet 43a located on the skin-facing side of the laminated structure of the central absorbent sheet 402, that is, the upper side sheet 2 side, and the non-skin facing side of the laminated structure are formed. The lower side sheet 43b on the side facing the back sheet 3, and the middle sheet 43c located between the two sheets 43a, 43b. In the central absorption portion 43 shown in FIG. 4 , the upper surface S1 is the surface facing the skin-facing side, that is, the front sheet 2 side, and the lower surface S2 is facing the non-skin-facing side, that is, the back sheet. 3 sides of the face.

On the other hand, the front side absorbent sheet 41 is arranged on the skin-facing side of the central absorbent portion 43 to cover the entire area of the skin-facing side of the central absorbent portion 43, and the back side absorbent sheet 42 is arranged on the central absorbent side. The non-skin-facing side of the portion 43 covers the entire area of the non-skin-facing side of the central absorbent portion 43 . The front-side absorbent sheet 41 and the back-side absorbent sheet 42 may be separate sheets. In this embodiment, the central portion of a wide body absorbent sheet 401 in the width direction constitutes the front-side absorbent sheet. The non-skin-facing side of the absorbent sheet 401 of the main body absorbent sheet 401 constitutes the back side absorbent sheet 42 . in Figure 3 In the example shown, the main body absorbent sheet 401 is bent toward the non-skin facing side at both ends in the transverse direction of the absorber 4, and the front end of the part extending from the bent portion to the inner side in the transverse direction of the absorber 4 Layer on top of 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 second region F in which the density of the fibrous material 48 is higher than that of the first region E in the thickness direction of the sheet. The first region E and the second region F extend over the entire area in the direction parallel to the surface of the central absorbent sheet 402 . The first region E and the second region F may be laminated in layers with a clear boundary between the first region E and the second region F, or they may be formed by making one fiber material 48 enter the other fiber material at the boundary between the two. The gap between the fibers of 48 makes the interface between the two unclear.

The main body absorbent sheet 401 in the sanitary napkin 1 of this embodiment has the same configuration as the central absorbent sheet 402 except that the first region E and the second region F do not contain an antibacterial agent.

Examples of the fibrous material 48 contained in the central absorbent sheet 402 and the main body absorbent sheet 401 include hydrophilic fibers in which hydrophobic fibers have been hydrophilized and themselves are hydrophilic. Particularly preferred are those that are hydrophilic in themselves and have water retention properties. As a hydrophilic fiber, a natural fiber, a cellulosic regenerated fiber, or a semi-synthetic fiber is mentioned as a preferable example. Cellulosic fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers are particularly exemplified as the hydrophilic fibers having water retention properties. Cellulosic fibers can be used alone or in combination of two or more. Examples of raw material pulp for cellulose fibers include wood pulp such as softwood kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp or grass pulp. As the cellulose-based fibers, crosslinked cellulose fibers (pulp fibers) obtained by intramolecularly or intermolecularly crosslinking cellulose with an appropriate crosslinking agent, or those obtained by increasing the crystallinity of cellulose can also be used. Regenerated cellulose fibers such as rayon fibers, etc.

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

As shown in FIG. 1 , in the sanitary napkin 1 , the central absorbent sheet 402 is arranged from the part B facing the excretion part to the rear part C in the longitudinal direction. Therefore, the part in which the central absorbent sheet 402 is arrange|positioned becomes the thick part 47 in which the thickness of the absorber 4 is thick compared with the periphery. Therefore, in the part where the central absorbent sheet 402 is arranged, the absorber 4 becomes easy to come into close contact with the wearer's skin side when worn.

Regarding each of the central absorbent sheet 402 and the main body absorbent sheet 401, as a configuration to form the second region F having a density higher than that of the first region E, for example, it may overlap with the first region E in the thickness direction. A configuration in which the second region F is provided over the entire area, or a configuration in which the second region F is partially provided so as to overlap with the first region E in the thickness direction only partially. In the sanitary napkin 1 of the present embodiment, both the central absorbent sheet 402 and the main body absorbent sheet 401 are provided with the second region F over the entire region overlapping in the thickness direction of the first region E.

Whether or not the absorbent sheet has the first region E and the second region F in which the densities of the fibrous materials are different from each other can be judged, for example, by the following method.

[Measuring method of density of fiber material]

Using 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.), cut the absorbent sheet (non-woven fabric) or absorber along the thickness direction. The section is zoomed in and observed, and the image data of the section is obtained. The magnification at the time of observation is a magnification to the extent that about 10 to 70 fiber sections can be observed, and is usually a magnification of 20 to 200 times. In the observation field of view of the above cut surface, the area occupied by fibers per fixed field of view (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 brightness boundary between the fiber and the part where no fiber exists, and the brightness is binarized. Generally speaking, when white and black are binarized, the fiber becomes white and the part where no fiber exists becomes black. Therefore, in the thickness direction of the absorbent sheet, the area with more white parts can be identified as the second. 2. Region F: identify the region with more black parts as the first region E. Then, calculate the area with white and the area with black in the above-mentioned fixed viewing area (0.02mm ² ), convert it into the area of fiber per unit area (1mm ² ), and set it as the density of fiber material (mm ² /mm ² ). In addition, the measurement of the density of this fiber material was performed at arbitrary 3 places of each 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 central absorbent sheet 402, the density of the fibrous material in the second region F measured by the above method is preferably 1.2 times or more the density of the fibrous material in the first region E measured by the same method , more preferably 2 times or more, and preferably 10 times or less, more preferably 7 times or less, and more preferably 1.2 times or more and 10 times or less, more preferably 2 times or more and 7 times or less.

The so-called absorbent sheet refers to an absorbent body shaped into a sheet, which is generally different from an absorbent body with a structure obtained by stacking absorbent materials. Typical examples of the absorbent sheet include those described in Japanese Patent No. 2963647, those described in Japanese Patent No. 2955223, and the like. As an absorbent sheet, it is preferable to use the adhesive force generated by the superabsorbent polymer in a wet state or additionally added adhesives such as adhesives or adhesive fibers to make the fibers between each other or the superabsorbent polymer Combined with the constituent fibers to form a sheet, etc. In addition, as an absorbent sheet, it is possible to use the method described in Japanese Patent Laid-Open No. 8-246395 Manufactured absorbent sheet containing pulp; after accumulating pulverized pulp and superabsorbent polymers supplied with the airflow, adhesives (such as vinyl acetate adhesives, PVA (polyvinyl alcohol, polyvinyl alcohol), etc. ) fixed dry sheets; absorbent sheets obtained by spreading superabsorbent polymers after coating hot-melt adhesives, etc., between paper or nonwoven fabrics containing pulp; Absorbent sheets obtained from absorbent polymers, etc. One of 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 where the density of the fibrous material is relatively low and the density of the fibrous material are relatively low. The relatively high second area F is from the skin-facing side in the thickness direction Z of the central absorbent portion 43 toward the non-skin-facing side, and sequentially produces the first area E, the second area F, the first area E, The second area F, the second area F, and the first area E. Moreover, the part filled in black in FIG. 4( b ) becomes the second region lamination part 44 where the second regions F having a relatively high density of fiber material are directly laminated without interposing the first region E. The second region laminated part 44 of the central absorbent part 43 shown in Fig. 4(a) and Fig. 4(b) includes the second region F of the middle sheet 43c and the second region F of the lower sheet 43b.

In the absorber 4 of the sanitary napkin 1 , the antibacterial agent 8 is arranged in the second region F of the central absorbent sheet 402 constituting the central absorbent portion 43 . More specifically, the antimicrobial agent 8 is arrange|positioned in the 2nd area|region F in the direction parallel to the surface of the sheet|seat of the center absorbent sheet 402 in the whole area. Therefore, the antimicrobial agent 8 is all disposed in the second region F of the upper sheet 43a, the second region F of the middle sheet 43c, and the second region F of the lower sheet 43b, and the second region constituting the layered part 44 of the second region. The antimicrobial agent 8 is arranged in both of the second regions F, that is, both of 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 fixed in the same way as the usual menstrual sanitary napkin Used on the crotch of shorts, etc.

According to the sanitary napkin 1 of the present embodiment, the central absorbing portion 43 is provided at least in the central portion of the transverse direction Y of the absorber 4 at the portion B facing the excretion portion, so that the absorber 4 is in close contact with the excretion portion of the wearer. During wearing, the body fluid supplied from the skin-to-face side is quickly absorbed into the central absorbent portion 43 . The central absorbent sheet 402 constituting the central absorbent portion 43 is located at the portion B facing the excretion portion, and further has a first region E with a relatively low density of fibrous material and a relatively high second region F, so that body fluids can be easily guided and It is held in the second area F. Moreover, since the central absorption part has the front side absorbent sheet 41 on the skin-facing side, bodily fluid introduced into the central absorption part is less likely to return to the wearer's skin. Moreover, since the antibacterial agent 8 is disposed in the second region F, the body fluid absorbed into the central absorbent portion 43 can be stably maintained with the antibacterial agent 8 for a long time in the second region F of the central absorbent sheet 402 immediately after discharge. touch. 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 central absorbent portion 43 , for example, the antibacterial agent may not be arranged over the entire absorber 4 . Therefore, an excellent antibacterial effect can be obtained even with a relatively small amount of antibacterial agent, and the generation of bad odor caused by bacteria or other troubles caused by bacteria can be suppressed efficiently and for a long time. In particular, if the absorbent body 4 is manufactured without applying an antimicrobial agent to the front side absorbent sheet 41, the antimicrobial agent is less likely to migrate to the wearer's skin, so the antimicrobial agent becomes less likely to come into contact with the resident bacteria existing on the wearer's skin. , so usability becomes good.

Moreover, in the sanitary napkin 1 of this embodiment, as mentioned above, the central absorbent part 43 has the 2nd area|region laminated part 44, and the antimicrobial agent 8 is arrange|positioned in the 2nd area|region F which comprises this 2nd area|region laminated part 44. The second area lamination part 44 is a part where the second area F with a higher fiber material density overlaps, so the amount of the antibacterial agent 8 per unit area of the second area lamination part 44 is greater than that of the second area lamination part 44 For some parts, the probability of body fluids coming into contact with antibacterial agents immediately after excretion increases. again, Since the antimicrobial agent is present in the region surrounded by the high-density fibrous material and the high liquid retention area, the body fluid and the antibacterial agent 8 are less likely to move from the second region lamination portion 44 even after absorbing body fluid. Therefore, it is easy to keep the frequency of contact between the body fluid in the second region laminated portion 44 and the antibacterial agent 8 high, and the durability of the antibacterial effect is excellent. Therefore, for example, the following effects are obtained: (1) Even if it is a small amount of antibacterial agent, the antibacterial effect can be exhibited for a long time, (2) It is difficult to reduce the target bacterial species for obtaining the antibacterial effect, (3) It is unpleasant to maintain the inhibition for a long time The effect of the production of the smell.

This effect will also be exhibited when only one of the two second regions F constituting the second region lamination part 44 is provided with an antibacterial agent, but it is more preferable that the sanitary napkin 1 of the present embodiment be placed in the The antimicrobial agent 8 is arranged in both of the two second regions F constituting the second region lamination part 44 . In addition, in terms of the persistence of the antibacterial effect, it is preferable that an antibacterial agent is disposed in at least the second region F on the skin-facing side of the two second regions F constituting the second region lamination part 44 .

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

If the antibacterial agent 8 is disposed in the entire area of the second region laminated portion 44 in a plan view of the absorber 4, after the body fluid is repeatedly discharged, in the sanitary napkin 1, even after the body fluid diffuses, the area in contact with the antibacterial agent 8 will be the same. Increase, body fluid and antibacterial agent 8 can be contacted in a wider range. By bringing the body fluid into contact with the antibacterial agent over 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 body fluids and enhancing the antibacterial effect, it is preferable that the antibacterial agent 8 be distributed over the entire 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 antibacterial agent, etc., and 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 more preferably 5.0 g/m ² or less, 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, 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 menstrual tampons can be used without particular limitation. For example, antimicrobial metals, antimicrobial metal supports, organic antimicrobial agents, and the like are exemplified.

Examples of metals having antibacterial properties include copper, silver, gold, lead, nickel, tin, zinc, iron, zirconium, and the like.

Examples of antibacterial metal supports include: silver zeolite, divinylbenzene-2-vinylpyridine-2-vinylpyridine silver copolymer (for example, as described in Japanese Patent Laid-Open No. 2006-307404), aluminum/silver /Sodium nitrate silicate (for example, those described in Japanese Patent Application Laid-Open No. 2005-232654 ), a composite of silicon dioxide/zinc oxide/alumina loaded with silver or zinc (specifically, loaded with antibacterial Hardly water-soluble or water-insoluble antimicrobial agents such as metal-substituted calcium nepheline minerals), silver-zirconium phosphate, and silver/zinc zeolite mixtures.

The organic antibacterial agent is preferably a quaternary ammonium salt, among which, benzalkonium chloride, cetyl phosphorylated benzalkonium and the like which are poorly soluble in water are suitably mentioned.

The sanitary napkin 1 preferably contains a water-insoluble or poorly water-soluble antibacterial agent as an 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, so the concentration of the antibacterial agent in the second area F or the second area laminated part 44 is maintained, thereby improving the antibacterial effect. The sustainability is further improved. As an example of a poorly water-soluble or water-insoluble antibacterial agent, the above-mentioned antibacterial metal-supported substance is preferable. Furthermore, the so-called antibacterial metal loading is poorly water-soluble or water-insoluble, which means that even if the loaded metal is water-soluble, the carrier (preferably porous particles) carrying the antibacterial metal is also poorly water-soluble or water-soluble. insoluble.

Furthermore, in the present invention, by the fibrous material of the central absorbent sheet 402 The antibacterial agent 8 is arranged in the second area F with a relatively high density, and it is easy to keep the body fluid in the second area F. Therefore, a water-soluble antibacterial agent can also be used from the viewpoint of suppressing the movement of the antibacterial agent 8 from the second region F to other members. In particular, when the antimicrobial agent 8 is blended in the second region F constituting the second region lamination part 44, the antimicrobial agent can be more effectively suppressed from moving from the second region F to other members.

Here, the so-called antibacterial agent is insoluble in water, which means that the solubility of ion-exchanged water at 25°C per 100g does not reach 20g, and the solubility of insoluble antibacterial agents in ion-exchanged water at 25°C is preferably less than 10g, and more preferably It is less than 1g. In addition, in this specification, when the said solubility is 0.1 g or less, it is set as water-insoluble. In addition, in this specification, poor water solubility and water insolubility may be collectively referred to as poor water solubility of a superordinate concept. On the other hand, the so-called antibacterial agent is water-soluble, which means that the solubility of the ion-exchanged water at 25°C is 20g or more, and the solubility of the water-soluble antibacterial agent for ion-exchanged water at 25°C is preferably 40g or more, and more preferably 50g above.

The above solubility can be measured by the following method. Put 100g of ion-exchanged water at 25°C into a 200mL beaker, put in the fully dried measurement object (antibacterial agent), put in a stirring piece with a length of 20mm and a width of 7mm, and stir it with a magnetic stirrer at 600rpm. The input amount before dissolving in 1 hour is set as the solubility of the antibacterial agent in water at 25°C. In addition, as a magnetic stirrer, HPS-100 by AS ONE Co., Ltd. etc. can be used.

Also, the content of the antibacterial agent 8 is preferably at least 0.001% by mass, more preferably at least 0.01% by mass, and preferably 12% with respect to the total mass of the central absorbent sheet 402 constituting the central absorbent portion 43 of the absorber 4. Mass % or less, More preferably, it is 5 mass % or less, Moreover, Preferably it is 0.001 mass % or more and 12 mass % or less, More preferably, it is 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 central absorbent sheet 402 constituting the central absorbent portion 43 contain a deodorant. By means of the absorber 4 or Combining the deodorant in the central absorbent sheet 402 with an antibacterial agent can more effectively suppress the generation of unpleasant odors caused by bacteria.

When the central 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 the effect of suppressing the generation of odors caused by bacteria, etc., but deodorants are expected to suppress odors that are not caused by bacteria or that are generated before the antibacterial agent works. The presence of the deodorant in the central absorbent portion 43, especially in the second region F, can effectively suppress the escape of odor from the skin-facing side and the non-skin-facing side of the absorbent article.

As a deodorant, it is a substance that directly acts on the odor (odor substance) itself, that is, it can absorb, neutralize, decompose, etc. the odor (odor substance) to show a deodorizing effect, and this technology can be used It is also widely used for deodorization purposes in the field. Examples of the deodorant used in the present invention include porous particles and water-soluble pH buffering agents.

The so-called porous particles as a deodorant mean particles having a plurality of fine pores at least on the surface of the particles and capable of trapping, adsorbing and/or encapsulating volatile odor components into the pores. Examples of the material of the porous particles include organic compounds, inorganic compounds, or polymers thereof, or combinations thereof. Specific examples thereof include, for example, 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. Synthetic porous polymers such as chitin and chitosan; natural porous polymers such as chitin and chitosan; zinc oxide, activated carbon, silicon oxide, silicon dioxide (silica gel), calcium silicate, aluminum silicate Compounds, high-silica zeolite (hydrophobic zeolite), sepiolite, cancryptite, zeolite, and inorganic porous materials such as hydrated zirconia, etc., preferably contain a compound selected from these At least 1 species in the group. become deodorant The object is that the odorous components from urine or menstrual blood and other excretions are mixed with multiple components such as ammonia, amines, fatty acids, hydrogen sulfide or mercaptans. In general, the molecular size of these odor components is 1 nm or more, so by using porous particles with an average pore diameter of 2 nm or more as a deodorant, multiple odor components can be effectively adsorbed.

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

<Measurement 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 multi-point method using liquid nitrogen using a pore distribution measuring device (Nippon bel Co., Ltd., trade name: BELSORP mini II). The top of the peak in the pore distribution was defined as the peak of the pore diameter. The measurement sample was pretreated by heating at 110° C. for 1 hour.

Also, the water-soluble pH buffering agent is an agent that neutralizes acidic or alkaline odor components generated in liquid phases such as excretion to reduce changes in pH. That is, the deodorant is neutralized using a balancing action. Such an agent is not particularly limited, and examples thereof include a weak acid or its conjugate base, or a mixture thereof or a salt thereof, a weak base or its conjugate acid, or a mixture thereof or a salt thereof. Specific examples of the water-soluble pH buffering agent include citric acid and the like as weak acids, and metal salts of Na, K, and Ca as salts thereof. Moreover, as a weak base, polyhydroxylamine compounds, such as tris (hydroxymethyl) aminomethane, etc. are mentioned, for example.

In particular, in the sanitary napkin 1 of this embodiment, it is preferable to contain citric acid and tris(hydroxymethyl)aminomethane as a pH buffering agent. By the combination of such weak acid and weak base components, not only can effectively suppress the generation of odor from acidic and alkaline odor components, but also can effectively suppress the deodorization including only pH buffering The agent cannot suppress the production of odors including neutral odors. As a result, with regard to the absorbent article 1 using the absorbent body 4 containing these pH buffering agents, even when it is worn for a long time, it can be realized that the wearer hardly notices the effect from the excretion fluid around the wearer. The higher the degree of odor, the better the deodorizing effect.

Furthermore, in the above-mentioned deodorant, the porous particles may support antibacterial or bactericidal metals. In this case, the porous particles have properties of both a deodorant and an antibacterial agent. In the sanitary napkin 1, it is preferable to include porous particles carrying an antibacterial metal in the absorber.

Regarding the absorbent article of the present invention, the absorbent body 4 may contain fragrance. The absorber 4 preferably contains the fragrance in the central absorbent portion 43 , that is, the central absorbent sheet 402 , and more preferably contains the fragrance in the second region F located inside the central absorbent portion 43 in the thickness direction. In the manufacturing process of the absorber, it is preferable to supply the fragrance from the second region F side of the central absorbent sheet 402 . In this case, if the central absorbent sheet 402 is laminated so that the second regions face each other, excessive volatilization of the fragrance to other parts can be suppressed, and the concentration of the fragrance on the central absorbent sheet is higher. The state in which the concentration exists is easy to maintain until the beginning of use, which is preferable.

By arranging the fragrance in the central absorbent sheet 402 located inside in the thickness direction, excessive volatilization of the fragrance can be suppressed, and the persistence of the odor masking effect can be further improved. From the same viewpoint, it is preferable to mix more fragrance in the second region F of the central absorbent sheet 402 than in the first region E.

As fragrances, for example, those described in Japanese Patent Application Laid-Open No. 2007-244764 Spices with green herbal aroma, plant extracts, citrus extracts, etc.

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 unfolded state is preferably from 0.1 g/m ² to 1 g/m ² , more preferably from 0.2 g/m ² to 0.6 g/m ² .

The central absorbent sheet 402 and the main body absorbent sheet 401 each preferably contain a superabsorbent polymer 46, and when the central absorbent sheet 402 and the main body absorbent sheet 401 have the first and second regions, respectively, Preferably, the amount of superabsorbent polymer 46 contained in the first region E is larger than that in the second region F. In particular, if the water absorption rate of the superabsorbent polymer placed in the first region is 20mL/0.3g‧30 seconds or less, further 15mL/0.3g‧30 seconds or less, further 10mL/0.3g‧30 seconds or less, then It is preferable that most or all of excreted body fluid is easily absorbed and retained by the superabsorbent polymer 46 in the first region E before it is absorbed and retained by the first region E and after the second region comes into contact with the antibacterial agent. Furthermore, regarding the lower limit of the water absorption rate, as long as it is 0mL/0.3g‧30 seconds or more, if it is 2mL/0.3g‧30 seconds or more, and further 4mL/0.3g‧30 seconds or more, it is compatible with the antibacterial agent The body fluid after contact is easily absorbed and held in the first region E moderately, which is preferable in terms of suppressing leakage of the fluid.

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

<Measurement method of water absorption speed>

，將No.2濾紙置於玻璃過濾器No.1上之台]之表面相等之水位，於該聚合物散佈台之表面上散佈測定對象之高吸收性聚合物0.3g。將散佈高吸 收性聚合物之時間點之吸水量設為0，測定30秒後之吸水量。該吸水量係以表示生理鹽水之水位之降低量的滴定管之刻度測定。將所獲得之吸水量之值設為藉由DW法所獲得之吸水速度。藉由DW法所獲得之吸水速度可藉由高吸收性聚合物之形狀、粒徑、容積比重、交聯度等進行設計。再者，測定係於23±2℃、濕度50±5%下進行，於測定之前將試樣於相同環境下保存24小時以上後測定。 The water absorption rate (unit: mL/0.3g‧30 seconds) obtained by the DW method is 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 is set to be [70mm from the polymer spreading table].

, put the No.2 filter paper on the surface of the glass filter No.1 [stage] equal to the water level, and spread 0.3 g of the superabsorbent polymer to be measured on the surface of the polymer spreading stage. The water absorption at the point in time when the superabsorbent polymer was sprayed was set to 0, and the water absorption 30 seconds later was measured. The water absorption is measured with the graduation of the burette indicating the decrease of the water level of the 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 speed obtained by the DW method can be designed according to the shape, particle size, volume specific gravity, cross-linking degree, etc. of the superabsorbent polymer. Furthermore, the measurement is carried out at 23±2°C and a humidity of 50±5%, and the sample is stored in the same environment for more than 24 hours before the measurement.

As the superabsorbent polymer 46, a granular one is generally used, but a fibrous one may be used. In the case of using a particulate superabsorbent polymer, the shape may be spherical, blocky, baggy or indeterminate. As superabsorbent polymers, generally, polymers or copolymers of acrylic acid or alkali metal acrylic acid salts can be used. Examples thereof include polyacrylic acid and its salts, and polymethacrylic acid and its salts. As polyacrylate or polymethacrylate, sodium salt can be preferably used. Also, maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acrylethanesulfonic acid, (methyl) ) A copolymer obtained by copolymerizing a comonomer such as 2-hydroxyethyl acrylate or styrenesulfonic acid with acrylic acid or methacrylic acid within the range that does not degrade the performance of the superabsorbent polymer.

The thickness per one absorbent sheet is preferably at least 0.1 mm, more preferably at least 0.3 mm, and is preferably at most 2 mm, particularly preferably at most 1.5 mm. More specifically, it is preferably from 0.1 mm to 2 mm, particularly preferably from 0.3 mm to 1.5 mm, from the viewpoint of obtaining an absorbent article having sufficient liquid diffusibility and liquid retention properties and having a good wearing feeling.

The absorbent sheet having the first and second regions used in the sanitary napkin 1 of this embodiment can be manufactured, for example, individually by any method such as a wet papermaking method or a dry papermaking method. The first fibrous sheet in the first area and the second fiber sheet that becomes the second area After the fibrous sheet is formed, they are combined and integrated by using adhesives or adhesive fibers, the adhesive force of the superabsorbent polymer in a swollen state, and the like. As a preferable example of the manufacturing method of the absorbent sheet, a fiber sheet in a wet state is formed by a wet papermaking method, a superabsorbent polymer is spread on the fiber sheet, and this is used as a first fiber sheet in a wet state material. Next, the second fibrous sheet in a dry state is stacked on the surface of the first fibrous sheet in a wet state on which the superabsorbent polymer is dispersed, to obtain a laminated sheet. Next, the target absorbent sheet is obtained by drying the laminated sheet using a drying unit such as a Yankee dryer. 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 pressure of the pressing part after papermaking in the manufacturing process of the second fiber sheet is increased. The method for the first fiber sheet; the method of making the material or thickness of the constituent fibers of each fiber sheet different, so that the density of the first fiber sheet is lower than that of the second fiber sheet; in the first and second A method in which one or both of the fiber sheets is in a wet state in the dry part of the laminated sheet, and the second sheet is placed on the side of the Yankee dryer to dry; or a method of combining two or more of these, etc. The central absorbent sheet 402 used in the sanitary napkin 1 of the present embodiment can be produced by applying an antibacterial agent in the manufacturing step of the second fiber sheet to be the second region, and then the The first fiber sheets in the regions are bonded and integrated. As a method of applying an antibacterial agent to the side of the second fiber sheet, there may be mentioned: a method of coating a solution or dispersion containing an antibacterial agent on the second fiber sheet before bonding; on the second fiber sheet side of the composite sheet A method of applying a solution or dispersion containing an antibacterial agent to the surface, followed by heating or allowing it to dry naturally; a method of spreading or blowing particles onto the composite sheet from the second fiber sheet side. As a method of applying a solution or dispersion containing an antibacterial agent, methods using known liquid application devices such as spray method, transfer method, die coating, gravure coating, inkjet method, screen printing, etc. wait.

Moreover, the absorber 4 of the sanitary napkin 1 of the present embodiment has a thick wall portion 47 including a central absorbent portion 43 made of a central absorbent sheet 402 with front side absorbent. The sheet 41 and the back side absorbent sheet 42 sandwich the formed absorbent sheet of a total of five layers. The thick portion 47 is formed in the central portion of the absorber 4 in the transverse direction Y, and in the longitudinal direction X of the absorber 4, is mainly formed in the excretory portion-facing portion B. The term "mainly formed in the excretory-portion-facing part B" means that more than 50% of the entire longitudinal length of the thick-walled part 47 exists in the excretory-portion-facing part B. By having the thick wall portion 47 at the central portion in the width direction of the absorber 4 having a width that does not reach the full width of the absorber 4, a large amount of bodily fluid excreted to the central portion in the width direction can be efficiently absorbed into the central absorbing portion. 43. The second area F in the central absorbent portion 43 is in contact with the antibacterial agent efficiently, so the generation of unpleasant odor caused by bacteria can be more effectively suppressed. From this point of view, the width of the central absorbent portion 43 is preferably 25% or more, more preferably 40% or more, and more preferably 75% or less, more preferably 60% or less, and more preferably 25% or more and 75% or less, 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 absorbent portion 43 is preferably 5% or more, more preferably 15% or more, and preferably 65% or less of the total length of the absorber 4 in the longitudinal direction X. It is preferably at most 55%, and more preferably at least 5% and not more than 65%, more preferably at least 15% and not more than 55%.

The thickness of the thick portion 47 of the absorber 4 is preferably at least 0.7 mm, more preferably at least 1 mm, and preferably at most 5 mm, further preferably at most 4 mm, more specifically, preferably at least 0.7 mm and at least 5 mm. It is less than or equal to more than 1 mm, and more preferably less than or equal to 4 mm. By setting the thickness of the thick wall portion 47 in such a range, it is easy to achieve a good wearing feeling of the excretory portion facing portion B, a high absorbency, and a high antibacterial effect at the same time. Moreover, when the absorbent article has wing parts like the sanitary napkin of this embodiment, it becomes easy to suppress the wrinkle of the absorbent body in the excretory part facing part when worn. In addition, the thickness of the absorber other than the thick portion 47 is preferably at least 0.3 mm, more preferably at least 0.5 mm, and preferably at most 3 mm, further preferably at most 2.5 mm, and more specifically, at least 2.5 mm. Preferably, it is 0.3 mm or more and 3 mm or less, and more preferably 0.5 mm or less. More than mm and less than 2.5mm. This range is preferable from the viewpoint of achieving higher absorbency and improving the followability to the wearer's movements. In addition, the thickness of an absorber and an absorbent sheet is measured by the following method.

<Measuring method of thickness of absorbent sheet and absorbent body>

The absorbent sheet or absorber as the object of measurement is placed in a horizontal place without wrinkles or bends, and the thickness is measured under a load of 5 cN/cm ² . The measurement of the thickness in the present invention uses a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.). At this time, place a circular or square plate (acrylic resin plate with a thickness of about 5 mm) in a plan view between the front end of the thickness gauge and the measurement portion of the object to be measured, and adjust the plate so that the load becomes 5 cN/cm ² size.

In the sanitary napkin 1 of the present embodiment described above, the absorber 4 is provided with a slit 45 extending parallel to the longitudinal direction X at the part B facing the excretion part of the absorber 4 as shown in FIGS. 2 and 3 . Therefore, in the sanitary napkin 1 of this embodiment, the longitudinal direction of the slit 45 is parallel to the longitudinal direction X. The menstrual blood reaching the absorber 4 easily spreads in the longitudinal direction X by the slit 45 and also easily permeates in the thickness direction of the absorber 4 . As shown in FIG. 2 , the sanitary napkin 1 has slit regions 45S in which slits 45 extending in the longitudinal direction X are dispersed in both directions of 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 to the excretion-portion-facing portion B but also to a portion of the front portion A and a portion of the rear portion C. As shown in FIG.

The slit 45 is formed by cutting an incision in the absorbent sheet.

If the slits 45, especially the slit regions 45S in which the slits 45 are distributed are arranged so that all of the front side absorbent sheet 41, the central absorbent portion 43, and the back side absorbent sheet 42 are laminated with the absorber 4 In the state where the areas overlap, the slit 45 opens following the movement of the wearer's body, and the The body fluid is quickly guided to the central absorbent portion 43 to which the antibacterial agent is given, and unlike the opening formed by cutting out a part of the absorbent sheet in plan view, the antibacterial agent in the central absorbent portion 43 may move to the central absorbent portion 43. Body fluid is not easy to return to the surface of the sanitary napkin 1 . Thereby, both antibacterial effect and absorption performance become excellent.

The slit 45 may be a through hole passing through 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 not passing through all the absorbent sheets. It is preferable that the slit 45 penetrates the front side absorbent sheet 41 and reaches the inside of the center absorption part 43 in the thickness direction. As an example, in addition to the above-mentioned slit 45 penetrating through the entire absorbent sheet, a slit that reaches the second area F of the upper side sheet 43a of the central absorbent portion and does not reach the first area E of the middle sheet 43c ; or reach the 2nd region of the middle sheet 43c of the central absorbing portion and not reach the slit of the 1st 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, further preferably 0.5 mm or less. Also, if the slit 45 is formed as a cutout, the lower limit of the opening width W45 is substantially 0 mm, and may be about 0.01 mm. Also, the interval D45 between the slits 45 and 45 in the transverse direction 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. , preferably not less than 0.1 mm and not more than 1.5 mm, and more preferably not less than 0.2 mm and not more than 1.2 mm. The opening width W45 of the slit 45 of the said absorber 4 is measured by the following method.

<Measuring method of opening width of slit 45>

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

The length (length in the longitudinal direction) L45 (length in the longitudinal direction) of the slit 45 when the absorber 4 is viewed from above is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, further preferably 25 mm or less, and , preferably not less than 10 mm and not more than 35 mm, and more preferably not less than 15 mm and not more than 25 mm.

In the sanitary napkin 1, it is preferable to apply an adhesive agent between the top sheet 2 and the absorber 4, and between the absorber 4 and the back sheet 3 to fix them. In addition, the layers of the laminated absorbent sheets constituting the absorbent body 4 may or may not be bonded, but it is preferable to bond them with an adhesive from the viewpoint of wrinkles or displacement of the absorbent body during use.

The adhesive agent can be applied using a known mechanism, for example, using a slit coating gun, a spiral spray gun, a spray gun, or a point gun. In the sanitary napkin 1, it is preferably applied in a spiral shape using a spiral spray gun. As an adhesive for coating, for example, a hot melt adhesive is preferably used. The coating amount of the hot melt adhesive is preferably not less than 1.5 g/m ² and not more than 10 g/m ² .

In addition, in order to form the slit 45 in the absorbent body 4 as shown in the sanitary napkin 1, it is only necessary to partially cut the layered body of the absorbent sheet by a known cutting mechanism. For example, the following cutting device can be used. The cutting device includes a cutter roller having a plurality of cutting blades extending in the circumferential direction dispersedly formed on the peripheral surface of the roller in the circumferential direction and the axial length direction of the roller, and an anvil roller receiving the blades of the cutter roller.

As shown in Fig. 1 and Fig. 3 , the sanitary napkin 1 of this embodiment has linear knurling in which the front sheet 2 and the absorber 4 are integrally recessed toward the back sheet 3 on the skin-facing surface of the absorbent main body 5. Slot 9. The embossed groove 9 is a groove in which both the surface sheet 2 and the absorber 4 are depressed, and the density of each fiber constituting the surface sheet 2 and the absorber 4 is higher than the peripheral portion of the groove. The embossed groove can be a continuous line or a discontinuous line such as a dotted line, for example, it can also be formed by a row formed by discontinuous embossing at multiple points. Sanitary napkin 1 has a There is a longitudinal rolling groove 92 extending in the longitudinal direction X, and each of the front part A and the rear part C has a horizontal rolling groove 91 extending in the horizontal direction Y. When looking down at the absorber 4, there are longitudinally pressed grooves 92 on both sides of the transverse Y of the central absorbing portion 43 containing the antibacterial agent, which suppresses the diffusion of body fluids in the transverse direction Y to prevent leakage, and collects the body fluids into the antibacterial agent-containing It is preferable in terms of the central absorption part 43 of the agent. Also, when the absorbent body 4 is viewed from above, the front and rear sides of the central absorbent portion 43 containing the antibacterial agent in the longitudinal direction X each have a laterally pressed groove 91 to suppress the diffusion of body fluids in the front and rear directions to prevent leakage and prevent the wrinkling of the sanitary napkin. From a point of view it is better. The absorbent article of the present invention may not have any one of the longitudinal rolling grooves 92 and the horizontal rolling grooves 91 , or both or all of the rolling grooves 9 .

As mentioned above, the present invention has been described based on its preferred embodiments, but the menstrual absorbent article of the present invention is not limited to the sanitary napkin 1 of the above-mentioned embodiments, and can be changed appropriately.

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

Moreover, the laminated form of the central absorbent sheet of the central absorbent part is not limited to what is shown in FIG. 4, and various laminated forms can be adopted.

The laminated form of the central absorbent sheet may be, for example, the form shown in Fig. 6(a) to Fig. 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 in half along the longitudinal bending portion b1 of the absorbent article. form. The central absorbent portion 43 shown in FIG. 6(b) is a central absorbent sheet 402 having a first region E and a second region F containing an antibacterial agent along two bending portions b1 along the longitudinal direction of the absorbent article. , b2 is formed by bending and folding into a three-fold state. The central absorbent portion 43 shown in FIG. 6(c) is made by placing two central absorbent sheets 402 having the first region E and the second region F containing an antibacterial agent so that the second region F is in surface contact. States overlap. In the central absorption portion 43 shown in FIGS. 6( a ) to 6 ( c ), a second region layered portion 44 is formed in which the second regions F are directly laminated without interposing the first region E.

The central absorbent portion 43 shown in Fig. 6(d) is to have two central absorbent sheets 402 having a first region E and a second region F containing an antibacterial agent, respectively, with the second region F facing the non-skin-facing side. Formed in layers. With regard to the central absorbent portion 43 and the central absorbent sheet 402 shown in Fig. 6(a) to Fig. 6(d), the central absorbent of the sanitary napkin 1 of the above-mentioned embodiment is appropriately applied within the scope of no particular contradiction. Description of the portion 43 and the central absorbent sheet 402. For example, in the central absorbent portion 43 shown in Fig. 6(a) ~ Fig. 6(d), from the viewpoint of improving the persistence of the antibacterial effect of the antibacterial agent, it is also preferred to be located in the thickness direction of the central absorbent portion 43. The second area F inside Z is equipped with an antimicrobial agent, in the central absorption part 43 shown in Fig. When either or both of the antibacterial agents are added, the antibacterial agent or body fluid becomes less likely to move to other parts, and the concentration of the antibacterial agent or the persistence of the antibacterial effect is improved, so it is preferable. In Fig. 6(a) to Fig. 6(d), similarly to Fig. 4 , the upper side in the figure is the skin-facing side, and the lower side in the figure is the non-skin-facing side.

The number of layers of the central absorbent sheet 402 of the central absorbent portion 43 is preferably at least 2, more preferably at least 3, and is preferably at most 7, more preferably at most 5, and is preferably at least 2 and at most 7, and more preferably at least 7. More than 3 and less than 5 are preferable.

In addition, regarding the absorber 4, the front side absorbent sheet 41, the back side absorbent sheet 42, and the central absorbent portion 43 are formed from the viewpoint of the absorption capacity and absorption speed when the body fluid is discharged, and that there is no uncomfortable feeling when worn. The total number of laminated layers of the central absorbent sheet 402 is preferably 3 or more, more preferably 5 or more, and is preferably 10 or less, more preferably 7 or less, and is preferably 3 or more and 10 or less, and more preferably Preferably more than 5 and less than 7.

Also, in the sanitary napkin 1 of the above-mentioned embodiment, the central absorbent portion 43 is formed The second region F of the central absorbent sheet 402 is provided with an antibacterial agent, but the first region E may contain an antibacterial agent or may not contain an antibacterial agent. When the antibacterial agent is contained in the first region E, the antibacterial agent of the same type as that in the second region F may be contained as the antibacterial agent. Furthermore, the antibacterial agent disposed in the first region E is preferably a poorly water-soluble antibacterial agent, among which water-insoluble or poorly water-soluble quaternary ammonium salt antibacterial agents are preferred. In the first area, since the fiber density is lower than that in the second area, the antibacterial agent of quaternary ammonium salt, which is water-insoluble or poorly soluble but ionic, is dispersed in the body fluid, and it is easy to move together with the body fluid until the fiber density is relatively high The second area F. By allowing the antibacterial agent to move with the body fluid, the concentration of the antibacterial agent in the second region F is increased, and 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 side closest to the skin-facing surface and has the second region F on the non-skin-facing surface side, a part of the body fluid is held in the In the first region E of the superabsorbent polymer, body fluids 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, the generation|occurrence|production of the odor originating in an organic matter in the 2nd area|region F which is the environment where the antimicrobial agent of high concentration exists can be suppressed effectively. Furthermore, at this time, by making the antibacterial agent in the first region E water-insoluble or poorly soluble, all the antibacterial agent will not move to the second region F and easily remain, so it is also possible to suppress the antibacterial agent from being held in the first region E. Odor production of organic substances present in body fluids.

The absorbent article for absorbing menstrual blood of the present invention may be a panty liner (vaginal secretion liner) or the like in addition to menstrual sanitary napkins.

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 forming a skin-facing surface, a back sheet forming a non-skin-facing surface, and a fiber material-containing sheet between the two sheets. The absorbent sheet serves as the absorbent body of the constituent member, and has the front and back of the wearer In the corresponding longitudinal direction and the transverse direction perpendicular to the longitudinal direction, the above-mentioned absorber has a laminated structure at least in the central part of the above-mentioned transverse direction of the absorber, and the laminated structure includes a front side absorbent sheet on the side facing the skin, The back side absorbent sheet on the non-skin-facing side and the central absorbent portion located between these two sheets, the central absorbent portion has a first region in its thickness direction, and the density of the fiber material is higher than the first The second area of the area, and the antibacterial agent is arranged in the second area.

<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 on the side of the non-skin-facing surface in the thickness direction of the central absorbent portion, there are plural A second region lamination part in which the above-mentioned second regions are directly laminated without interposing the above-mentioned first regions.

<3> The absorbent article according to the above <2>, wherein the antimicrobial agent is disposed on the entire area of the second region laminated portion in plan view of the absorbent body.

<4> The absorbent article according to any one of the above <1> to <3>, wherein the antibacterial agent includes a water-insoluble or poorly water-soluble 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-supported substance.

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

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

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

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

<10> The absorbent article according to any one of the above <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. The total mass of the sheet is not less than 0.001% by mass and not more than 12% by mass, preferably not less than 0.01% by mass and not more than 5% by mass.

<11> The absorbent article according to any one of the above <1> to <10>, wherein the central absorbent portion 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>, wherein the deodorant contains a pH buffering agent.

<15> The absorbent article according to the above <14>, wherein citric acid and tris(hydroxymethyl)aminomethane are contained as the pH buffering agent.

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

<17> The absorbent article according to any one of the above <1> to <16>, wherein the absorber is on the front side absorbent sheet, the central absorbent sheet constituting the central absorbent portion, and the back side The region where the absorbent sheets overlap has a slit that penetrates the above-mentioned front-side absorbent sheet and reaches the inside in the thickness direction of the above-mentioned central absorbent portion.

<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 <17> or <18> above, wherein the length of the slit is The direction length is not less than 10 mm and not more than 35 mm, preferably not less than 15 mm and not more than 25 mm.

<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, more preferably 0.5 mm or less.

<21> The absorbent article according to any one of the above <17> to <20>, wherein a 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 larger than that in the second region.

<24> The absorbent article according to <22> or <23> above, wherein 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 and 15 mL/0.3 g or more. 0.3g‧30 seconds or less, more preferably 4mL/0.3g‧30 seconds or more and 10mL/0.3g‧30 seconds or less.

<25> The absorbent article according to any one of the above <1> to <24>, wherein the absorber has a thick portion at a portion facing the excretion 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% to 75% of the total width of the absorbent body in the portion where the central absorbent portion exists, preferably 40% to 60% the following.

<28> The absorbent article according to any one of the above <25> to <27>, wherein 50% or more of the total length in the longitudinal direction of the thick portion exists in the excretory portion-facing portion.

<29> The absorbent article according to the above <28>, wherein the longitudinal direction of the central absorbent portion is The length in the direction is not less than 5% and not more than 65% of the total length of the absorbent body in the longitudinal direction, preferably not less than 15% and not more than 55%.

<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 hardly 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 menstrual sanitary napkin.

[Industrial Utilization Possibility]

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

43‧‧‧Central absorption department

43a‧‧‧upper sheet

43b‧‧‧bottom sheet

43c‧‧‧intermediate sheet

44‧‧‧Second area lamination department

402‧‧‧Central absorbent sheet

b1‧‧‧bending part

b2‧‧‧bending part

E‧‧‧1st area

e1‧‧‧one edge

e2‧‧‧the other edge

F‧‧‧Second area

S1‧‧‧upper side

S2‧‧‧The lower side

Y‧‧‧horizontal

Z‧‧‧thickness direction

Claims (28)

An absorbent article comprising a liquid-permeable front sheet forming a skin-facing surface, a back sheet forming a non-skin-facing surface, and an absorbent sheet containing a fibrous material located between the two sheets Absorbent material as a constituent member, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a transverse direction perpendicular to the longitudinal direction, the above-mentioned absorbent body has a laminated structure at least in the central part of the above-mentioned transverse direction of the absorbent body, and the laminated structure Consists of a front side absorbent sheet on the side facing the skin, a back side absorbent sheet on the non-skin facing side, and a central absorbent portion located between these two sheets, and the central absorbent portion is defined by its thickness In the direction, there is a first region containing cellulose-based fibers, and a second region containing cellulose-based fibers and having a fiber material density higher than that of the first region. The density of the above-mentioned fiber materials is the area of fibers per unit area. In the above Antibacterial agents are arranged in the second area. The antibacterial agents include water-insoluble or poorly soluble antibacterial agents. The above-mentioned water-insoluble or poorly soluble antibacterial agents are antibacterial metal supports. The solubility of 100g is less than 20g, the above-mentioned central absorbent part has a structure in which multiple layers of central absorbent sheets are laminated, and there are a plurality of the above-mentioned second regions not interposed on the side of the non-skin-facing surface in the thickness direction of the above-mentioned central absorbent part In the second region lamination part directly laminated across the first region, the first region and the second region contain a superabsorbent polymer, and the content of the superabsorbent polymer in the first region is greater than that in the second region . The absorbent article according to claim 1, 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 antimicrobial agent is disposed on the entire area of the second region laminated portion in plan view of the absorbent body. The absorbent article according to claim 1 or 2, wherein the carrier of the antibacterial metal loading is hydrophobic porous particles. The absorbent article according to claim 1 or 2, wherein an organic antibacterial agent is contained as the antibacterial agent. The absorbent article according to claim 5, wherein the organic antibacterial agent is a water-insoluble or hardly water-soluble quaternary ammonium salt. The absorbent article according to claim 1 or 2, wherein the above-mentioned water-insoluble or poorly water-soluble antibacterial agent and water-soluble antibacterial agent are contained together as the above-mentioned antibacterial agent. The absorbent article according to claim 1 or 2, wherein the content of the antibacterial agent is 0.001% by mass or more and 12% by mass or less relative to the total mass of the central absorbent sheet. The absorbent article according to claim 1 or 2, wherein the central absorbent portion contains a deodorant. The absorbent article according to claim 9, wherein at least the second region contains the deodorant. The absorbent article according to claim 9, wherein the deodorant contains porous particles. The absorbent article according to claim 9, wherein the deodorant contains a pH buffering agent. The absorbent article according to claim 12, wherein citric acid and tris(hydroxymethyl)aminomethane are contained as the pH buffering agent. The absorbent article according to claim 1 or 2, wherein the central absorbent portion contains fragrance. The absorbent article according to claim 1 or 2, wherein the absorber has a penetrating region where the front absorbent sheet, the central absorbent sheet constituting the central absorbent portion, and the rear absorbent sheet overlap. The above-mentioned front-side absorbent sheet is a slit reaching inside in the thickness direction of the above-mentioned central absorbent portion. The absorbent article according to claim 15, wherein the longitudinal direction of the slit extends parallel to the longitudinal direction. The absorbent article according to claim 15, wherein the length of the slit in the longitudinal direction is not less than 10 mm and not more than 35 mm. The absorbent article according to claim 15, wherein the opening width of the slit is 1.2 mm or less. The absorbent article according to claim 15, wherein a plurality of the slits are dispersedly arranged in both the vertical direction and the horizontal direction. The absorbent article according to claim 1 or 2, wherein the absorber has a thick portion at a portion facing the excretion portion. The absorbent article according to claim 20, wherein the width of the central absorbent portion does not reach the full width of the absorbent body. The absorbent article according to claim 21, wherein the width of the central absorbent portion is 25% to 75% of the entire width of the absorbent body at the portion where the central absorbent portion exists. The absorbent article according to claim 20, wherein more than 50% of the total length in the longitudinal direction of the above-mentioned thick wall portion exists in the portion facing the excretion portion. The absorbent article according to claim 23, wherein the longitudinal length of the central absorbent portion is 5% to 65% of the total length of the absorber in the longitudinal direction. The absorbent article according to claim 1 or 2, which also contains an antibacterial agent in the first region. The absorbent article according to claim 25, wherein the antibacterial agent contained in the first region is water-insoluble or hardly water-soluble. The absorbent article according to claim 26, wherein the antibacterial agent contained in the first region is a water-insoluble or hardly water-soluble quaternary ammonium salt. The absorbent article according to claim 1 or 2, wherein the above-mentioned absorbent article is a menstrual sanitary napkin.

Images