Absorbent article

Abstract

To provide an absorbent article which reduces possibility of making a wearer etc. feel a fear that wearing long is unsanitary, while reducing bad effects on the skin of the wearer.SOLUTION: An absorbent article (1) has: a liquid-absorbable absorber (11); and a skin-side sheet (12) positioned on the skin side of the absorber (11). The absorber (11) comprises highly absorbent polymer having a basis weight of 270 g / m2 or more, and the skin-side sheet (12) comprises an antibacterial agent (R). Between the absorber (11) and the skin-side sheet (12), an adhesive (12x) is provided. In a plane view in an unfolded state and a stretched state of the absorbent article (1), in a region overlapping with the absorber (11), there are an adhesion part (18) being a region where the adhesive (12x) exists, a non-adhesion part (19) being a region where the adhesive (12x) does not exist, a portion where the antibacterial agent (R) and the adhesion part (18) overlap, and a portion where the antibacterial agent (R) and the non-adhesion part (19) overlap.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Conventionally, absorbent articles such as disposable diapers, absorbent pads, and sanitary napkins for absorbing excrement have been known. When absorbent articles absorb excrement containing moisture, bacteria tend to multiply. In order to reduce the adverse effects on the wearer's skin, absorbent articles with suppressed bacterial growth are known. Patent Document 1 discloses a pant-type absorbent article that suppresses the growth of miscellaneous bacteria after absorbing excrement such as urine, blood, and feces.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even when wearing an absorbent article such as the pant-type absorbent article of Patent Document 1, excrement is not necessarily discharged into the absorbent article. Therefore, it is desired to continue wearing the absorbent article for a long time, or to once remove the worn absorbent article, leave it empty for a predetermined time, and then wear it again. However, even if the absorbent article has not absorbed excrement and appears clean, since it absorbs the wearer's sweat etc., there is a risk of giving the wearer etc. a concern that it may have an adverse effect on the wearer's skin due to bacterial growth or that wearing such an absorbent article is unhygienic.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide an absorbent article that reduces the adverse effects on the wearer's skin and reduces the risk of giving the wearer etc. a concern that long-term wearing is unhygienic.

Means for Solving the Problems

[0006] The main invention for achieving the above object is an absorbent article having an absorbent body with liquid absorbency and a skin-side sheet located on the skin side of the absorbent body, wherein the absorbent body has a basis weight of 270 g / m 2 or more of a superabsorbent polymer, the skin-side sheet includes an antibacterial agent, an adhesive is provided between the absorbent body and the skin-side sheet, and in a plan view of the absorbent article in a deployed and extended state, in a region overlapping the absorbent body, there is an adhesive portion which is a region where the adhesive exists and a non-adhesive portion which is a region where the adhesive does not exist, and there is a portion where the antibacterial agent overlaps with the adhesive portion and a portion where the antibacterial agent overlaps with the non-adhesive portion. The absorbent article is characterized by this. Other features of the present invention will be clarified by the description in this specification and the attached drawings.

Effects of the Invention

[0007] According to the present invention, it is possible to provide an absorbent article that reduces the adverse effects on the skin of the wearer and reduces the fear of giving the wearer and the like the concern that long-term wearing is unhygienic.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0009] From the descriptions in this specification and the accompanying drawings, at least the following matters become clear. (Aspect 1) An absorbent article having a liquid-absorbent absorber and a skin-side sheet located on the skin side of the absorber, wherein the absorber has a basis weight of 270 g / m 2 or more of a superabsorbent polymer, the skin-side sheet includes an antibacterial agent, an adhesive is provided between the absorber and the skin-side sheet, and in a plan view of the absorbent article in a deployed and stretched state, in a region overlapping the absorber, there is an adhesive portion which is a region where the adhesive exists and a non-adhesive portion which is a region where the adhesive does not exist, and there is a portion where the antibacterial agent overlaps with the adhesive portion and a portion where the antibacterial agent overlaps with the non-adhesive portion. The absorbent article is characterized in that.

[0010] According to the absorbent article of Aspect 1, in an absorbent article assuming long-term wearing by providing the absorber with a superabsorbent polymer having a basis weight of 270 g / m 2 or more, the portion where the antibacterial agent and the adhesive portion overlap in a plan view reduces the absorption of the antibacterial agent provided on the skin-side sheet by the absorber, and even when the absorbent article is not absorbing excreta such as feces and urine, it reduces the growth of bacteria due to moisture between the absorber and the wearer's skin, and the portion where the antibacterial agent and the adhesive portion do not overlap in a plan view makes it easier to discharge the moisture inside the absorber to the outside, and makes it easier to reduce the propagation of bacteria inside the absorber. As a result, while reducing the adverse effects on the wearer's skin caused by wearing the absorbent article, it is possible to reduce the fear of giving the wearer and the like the concern that long-term wearing is unhygienic.

[0011] (Aspect 2) In the unfolded and extended state, it has a longitudinal direction, a transverse direction, and a thickness direction that intersect each other, and is characterized in that the non-adhesive part includes a portion that is continuous in the longitudinal direction, which is the absorbent article according to Aspect 1.

[0012] According to the absorbent article of Aspect 2, due to the rigidity difference between the adhesive part and the non-adhesive part, a rigidity difference occurs, and it becomes easier for the absorbent body to bend starting from the end of the non-adhesive part. While fitting the absorbent article to the wearer's body, the non-adhesive part that is continuous in the longitudinal direction can improve the air permeability of the absorbent body from the ventral side to the dorsal side during wearing, so that the risk of bacteria breeding inside the absorbent body can be reduced.

[0013] (Aspect 3) The absorbent body has a low basis weight region where the basis weight is lower than that of the surroundings, and in a plan view in the unfolded and extended state of the absorbent article, there is a portion where the non-adhesive part, the antibacterial agent, and the low basis weight region overlap, which is the absorbent article according to Aspect 1 or 2.

[0014] According to the absorbent article of Aspect 3, the absorbent body provided with the low basis weight region is easily deformed along the wearer's body by folding along the low basis weight region. The low basis weight region has higher air permeability than the surroundings, and it becomes easier to release the heat and air inside the absorbent body to the outside. Also, in a plan view, the overlap of the non-adhesive part, the antibacterial agent, and the low basis weight region makes it easier to release the stuffiness inside the absorbent body to the outside, and the risk of bacteria breeding inside the absorbent body can be reduced.

[0015] (Aspect 4) The antibacterial agent is a silver-based antibacterial agent, which is the absorbent article according to any one of Aspects 1 to 3.

[0016] According to the absorbent article of Aspect 4, the silver-based antibacterial agent easily releases silver ions in a humid environment. Although silver ions are highly safe for the human body, they can inactivate bacteria and suppress the growth of bacteria. Therefore, while reducing the adverse effects on the wearer's skin caused by wearing the absorbent article, the risk of giving the wearer and others a concern that long-term wearing is unhygienic can be reduced.

[0017] (Aspect 5) The absorbent article according to any one of Aspects 1 to 3, wherein the antibacterial agent is a cationic antibacterial agent.

[0018] According to the absorbent article of Aspect 5, since the cationic antibacterial agent has low toxicity to the human body and high safety, it can be used at a high concentration, and the antibacterial effect can be enhanced.

[0019] (Aspect 6) The skin-side sheet has a skin-side layer located on the skin side and a non-skin-side layer located on the non-skin side of the skin-side layer, and the skin-side layer and the non-skin-side layer each include durable hydrophilic fibers. The absorbent article according to any one of Aspects 1 to 5.

[0020] According to the absorbent article of Aspect 6, even when the absorbent article absorbs moisture during wearing, the risk of continuously retaining moisture in the skin-side sheet can be reduced. Also, even when repeatedly absorbing moisture, the risk of a decrease in the absorption rate can be reduced. Therefore, even when the absorbent article is used for a long time, the risk of bacterial growth can be reduced.

[0021] (Aspect 7) The skin-side sheet has a skin-side layer located on the skin side and a non-skin-side layer located on the non-skin side of the skin-side layer, and the antibacterial agent is provided in the non-skin-side layer. The absorbent article according to any one of Aspects 1 to 6.

[0022] According to the absorbent article of Aspect 7, by reducing the risk of the antibacterial agent directly touching the skin of the wearer, while suppressing the growth of bacteria in the absorbent article, it becomes difficult to stimulate the skin of the wearer.

[0023] (Aspect 8) The absorber has an absorbent core and a core wrap sheet covering at least the skin side surface of the absorbent core. Between the absorbent core and the core wrap sheet, there are a core-side joint portion joined by a core-side adhesive and a core-side non-joint portion not joined by the core-side adhesive. In a plan view of the absorbent article in a deployed and stretched state, the antibacterial agent, the non-adhesive portion, and the core-side non-joint portion have overlapping portions. The absorbent article is any one of Aspects 1 to 7

[0024] According to the absorbent article of Aspect 8, it becomes easier to discharge the moisture inside the absorber to the outside, and it becomes easier to reduce the growth of bacteria inside the absorber.

[0025] (Aspect 9) A ventilation film is provided on the non-skin side of the absorber, and a film-side adhesive is provided between the absorber and the ventilation film. In a plan view of the absorbent article in a deployed and stretched state, in the region overlapping the absorber, there are a ventilation film-side adhesive portion which is the region where the film-side adhesive exists and a ventilation film-side non-adhesive portion which is the region where the ventilation film-side adhesive does not exist. The absorbent article is any one of Aspects 1 to 8, characterized in that the ventilation film-side non-adhesive portion per unit area is larger than the non-adhesive portion per unit area.

[0026] According to the absorbent article of Aspect 9, since the ventilation film-side non-adhesive portion per unit area is larger than the non-adhesive portion per unit area, the ventilation film-side non-adhesive portion side which is the non-skin surface side of the absorbent article is more likely to release more moisture from the absorber than the skin surface side of the absorbent article (the non-adhesive portion on the skin-side sheet side). Thereby, it is possible to reduce the colonization of bacteria due to the moisture between the absorber and the skin of the wearer.

[0027] (Aspect 10) In the deployed and extended state, it has a vertical direction, a horizontal direction, and a thickness direction that intersect each other, and the antibacterial agent is provided at least at the horizontal end of the skin-side sheet. The horizontal end of the skin-side sheet covers at least a part of the side surface of the absorber and the non-skin side surface of the absorber. The absorbent article according to any one of Aspects 1 to 9.

[0028] According to the absorbent article of Aspect 10, it is easy to reduce the growth of bacteria inside the absorber.

[0029] (Aspect 11) In a plan view of the absorbent article in the deployed and extended state, the total amount of the antibacterial agent overlapping the adhesive portion is greater than the total amount of the antibacterial agent overlapping the non-adhesive portion. The absorbent article according to any one of Aspects 1 to 10.

[0030] According to the absorbent article of Aspect 12, in a plan view, compared with the case where the total amount of the antibacterial agent overlapping the adhesive portion is made less than the total amount of the antibacterial agent overlapping the non-adhesive portion, the absorption of the antibacterial agent provided on the skin-side sheet by the absorber is reduced. Even when the absorbent article is not absorbing excreta such as feces and urine, it is easy to reduce the growth of bacteria due to moisture between the absorber and the wearer's skin.

[0031] (Aspect 12) In a plan view of the absorbent article in the deployed and extended state, the total amount of the antibacterial agent overlapping the adhesive portion is less than the total amount of the antibacterial agent overlapping the non-adhesive portion. The absorbent article according to any one of Aspects 1 to 10.

[0032] According to the absorbent article of Aspect 12, in a plan view, compared with the case where the total amount of the antibacterial agent overlapping the adhesive portion is greater than the total amount of the antibacterial agent overlapping the non-adhesive portion, it is easier to discharge the moisture inside the absorber to the outside, and it is easier to reduce the growth of bacteria inside the absorber.

[0033] (Aspect 13) In the plan view of the absorbent article in the unfolded and stretched state, the total area of the adhesive portion is larger than the total area of the non - adhesive portion, which is the absorbent article according to any one of aspects 1 to 12.

[0034] According to the absorbent article of aspect 13, compared with the case where the total area of the adhesive portion is less than or equal to the total area of the non - adhesive portion, the absorption of the antibacterial agent provided on the skin - side sheet by the absorber is reduced. Even when the absorbent article is not absorbing excreta such as feces and urine, it becomes easier to reduce the growth of bacteria due to moisture between the absorber and the wearer's skin.

[0035] (Aspect 14) The skin - side sheet has a skin - side layer located on the skin side and a non - skin - side layer located on the non - skin side of the skin - side layer. The non - skin - side layer has general hydrophilic fibers and antibacterial fibers provided with the antibacterial agent. The basis weight of the general hydrophilic fibers in the non - skin - side layer is less than 7 g / m 2 This is the absorbent article according to any one of aspects 1 to 13, characterized in that it is smaller.

[0036] According to the absorbent article of aspect 15, while reducing the adverse effects on the wearer's skin caused by wearing the absorbent article, it is possible to reduce the fear of giving the wearer and others the concern that long - term wearing is unhygienic.

[0037] (Aspect 15) The skin - side sheet has antibacterial fibers provided with the antibacterial agent, and the basis weight of the antibacterial fibers is greater than 6 g / m 2 This is the absorbent article according to any one of aspects 1 to 14, characterized in that it is larger.

[0038] According to the absorbent article of aspect 15, while reducing the adverse effects on the wearer's skin caused by wearing the absorbent article, it is possible to reduce the fear of giving the wearer and others the concern that long - term wearing is unhygienic.

[0039] ===Embodiment=== As an absorbent article according to the present invention, embodiments will be described by taking a pants-type disposable diaper for infants as an example. However, the absorbent article according to the present invention may be a pants-type disposable diaper for adults or infants, a tape-type disposable diaper, a sanitary shorts, a sanitary napkin, a light incontinence pad, or an absorbent pad, etc.

[0040] <<<Basic configuration of diaper 1>>> FIG. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter referred to as "diaper 1"). FIG. 2 is a schematic plan view of diaper 1 in a deployed and extended state as viewed from the skin side. FIG. 3 is a schematic cross-sectional view taken along the line A-A in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along the line B-B in FIG. 2. The "deployed state" means a state in which the side joints 40 between the side portions of the front torso portion 20 and the side portions 30a of the rear torso portion 30 on both sides of diaper 1 are separated and opened, and the entire diaper 1 is flattened. The "extended state" means a state in which the elastic members provided in diaper 1 are extended until the wrinkles of diaper 1 are no longer visible. Specifically, it indicates a state in which each member constituting diaper 1 (for example, the front torso portion 20 described later) is extended until the dimensions of the member are the same as or close to the dimensions of the member alone. The line C-C in FIG. 2 and the like is the center line in the lateral direction, and the line CL is the center line in the longitudinal direction. Hereinafter, the wearer of diaper 1 and the person who intends to wear diaper 1 on the wearer are also referred to as "wearer etc.".

[0041] As shown in FIG. 1, the pants-type diaper 1 has an up-down direction, a lateral direction, and a front-back direction, and a torso opening BH and a pair of leg openings LH are formed in diaper 1. In the up-down direction, the side of the torso opening BH is the upper side, and the side that becomes the crotch of the wearer is the lower side. The up-down direction of diaper 1 in the state of FIG. 2 (deployed and extended state) is also referred to as the "longitudinal direction" or "vertical direction", the front side in the longitudinal direction is also referred to as the "ventral side", the back side is also referred to as the "dorsal side", and the substantially central portion CL side in the longitudinal direction is also referred to as the "lower side". Further, as shown in FIG. 3, diaper 1 has a thickness direction, and the side that contacts the wearer in the thickness direction is the skin side, and the opposite side is the non-skin side.

[0042] The diaper 1 is of the so-called three-piece type and has a crotch portion 50, a front torso surrounding portion 20, and a rear torso surrounding portion 30. The front torso surrounding portion 20 covers the ventral side of the wearer, and the rear torso surrounding portion 30 covers the dorsal side of the wearer. The absorbent body 10 is substantially rectangular in plan view. As shown in FIG. 3, the ventral upper end portion and the dorsal upper end portion of the absorbent body 10 are overlapped with the skin side surfaces of the torso surrounding portions 20 and 30, respectively. The front torso surrounding portion 20 and the rear torso surrounding portion 30 are substantially rectangular in plan view, and their longitudinal directions are along the lateral direction.

[0043] As shown in the unfolded state of FIG. 2, the diaper 1 has a shape that is symmetric about the center line C-C. The non-skin side surfaces of the ventral upper end portion and the dorsal upper end portion of the absorbent body 10 are joined to the skin side surfaces of the torso surrounding portions 20 and 30 by an adhesive or the like. From the unfolded state shown in FIG. 2, the absorbent body 10 is folded in half so that the front torso surrounding portion 20 and the rear torso surrounding portion 30 face each other, and both lateral sides in the lateral direction of the front torso surrounding portion 20 and both lateral sides in the lateral direction of the rear torso surrounding portion 30 are joined to form a side joint portion 40, whereby the diaper 1 becomes a pants type.

[0044] As shown in FIGS. 2 and 3, the front torso surrounding portion 20 has an inner layer sheet 21, an outer layer sheet 22, and a plurality of torso elastic members 23 such as thread rubber that expand and contract in the lateral direction. The inner layer sheet 21 and the outer layer sheet 22 are joined to each other via the torso elastic members 23 coated with an adhesive. The plurality of torso elastic members 22 are arranged side by side at intervals in the vertical direction. Due to the expansion and contraction of the torso elastic members 23, the front torso surrounding portion 20 can expand and contract in the lateral direction and fit around the wearer's torso.

[0045] As shown in FIGS. 2 and 3, the rear torso surrounding portion 30 has an inner layer sheet 31, an outer layer sheet 32, and a plurality of torso elastic members 33 such as thread rubber that expand and contract in the lateral direction. The inner layer sheet 31 and the outer layer sheet 32 are joined to each other via the torso elastic members 33 coated with an adhesive. The plurality of torso elastic members 33 are arranged side by side at intervals in the vertical direction. Due to the expansion and contraction of the torso elastic members 33, the rear torso surrounding portion 30 can expand and contract in the lateral direction and fit around the wearer's torso.

[0046] As shown in FIGS. 2 and 4, in the order from the skin side in the thickness direction, the lower crotch portion 50 includes an absorbent main body 10, a leg-around gather portion 41, and an outer cover sheet 45. The absorbent main body 10, the leg-around gather portion 41, and the outer cover sheet 45 are each adhered with an adhesive such as a hot melt adhesive.

[0047] FIG. 5 is an enlarged view of the absorbent main body 10 in FIG. 2. The absorbent main body 10 has, in the order from the skin side in the thickness direction, a skin-side sheet 12, an absorber 11, and a non-skin-side sheet 15, and is adhered to adjacent members with adhesives 12x, 11x, and 15x such as a hot melt adhesive, respectively. Further, it has a pair of leak-proof wall forming sheets 13 that cover both side ends of the absorber 11 and the skin-side sheet 12, respectively.

[0048] The skin-side sheet 12 is a liquid-permeable sheet, and examples thereof include an air-through nonwoven fabric, a spunbond nonwoven fabric, and a point bond - spunlace nonwoven fabric. Details of the skin-side sheet 12 will be described later. The non-skin-side sheet 15 is a liquid-impermeable sheet, and examples thereof include a polyethylene film, a polypropylene film, and a hydrophobic SMS nonwoven fabric. The skin-side sheet 12 and the non-skin-side sheet 15 may each be provided with a predetermined hydrophilicity by treating natural fibers or synthetic fibers with a predetermined hydrophilic treatment agent. The treatment with the hydrophilic treatment agent includes, for example, a method of adding a hydrophilic treatment agent to a synthetic resin and spinning the synthetic resin, a method of dissolving or dispersing a hydrophilic treatment agent in a suitable solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent to obtain a hydrophilic treatment liquid, immersing natural fibers or synthetic resins in the hydrophilic treatment liquid for a predetermined time, and drying, and a method of applying a hydrophilic treatment agent or a hydrophilic treatment liquid obtained by dissolving or dispersing a hydrophilic treatment agent in a suitable solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent to natural fibers or synthetic resins. The skin-side sheet 12 and the non-skin-side sheet 15 are sized to cover the entire absorber 11 from the skin side and the non-skin side, respectively.

[0049] The absorber 11 includes an absorbent core 11a and a core wrap sheet 11b. The absorbent core 11a absorbs and holds excreta such as urine and feces. Examples of the absorbent core 11a include those in which liquid-absorbent fibers such as pulp fibers containing a superabsorbent polymer (SAP) are formed into a predetermined shape. The basis weight of the superabsorbent polymer in the absorbent core 11a (absorber 11) of the present embodiment is 270 g / m 2 or more. Since the basis weight of the superabsorbent polymer in the absorbent core 11a is 270 g / m 2 or more, the diaper 1 is a disposable absorbent article suitable for long-term wearing, and for example, is a disposable absorbent article suitable for night-use diapers. Examples of the core wrap sheet 11b include tissue paper. Note that a configuration without the core wrap sheet may also be used. In the absorber 11, the absorbent core 11a may have a low basis weight region such as a linear squeezing portion or a slit penetrating in the thickness direction, or a high basis weight region in which the basis weight of the liquid-absorbent fibers is partially increased.

[0050] The leak-proof wall forming sheet 13 is a sheet for forming a leak-proof wall portion 13b, is a liquid-impermeable sheet, and examples thereof include a hydrophobic SMS nonwoven fabric. The pair of leak-proof wall portions 13b are so-called three-dimensional gathers. The leak-proof wall portion 13b includes a leak-proof wall elastic member 13a along the longitudinal direction of the absorbent main body 10. In the leak-proof wall portion 13b of the present embodiment, the lateral side ends of each leak-proof wall forming sheet 13 are folded back toward the skin side, and further, the leak-proof wall elastic member 13a is provided at the inner ends in the lateral direction of the portion of the leak-proof wall forming sheet 13 folded back toward the skin side, whereby the leak-proof wall portion 13b is formed. Due to the contraction of the leak-proof wall elastic member 13a, the leak-proof wall portion 13b stands up toward the skin side and fits around the crotch of the wearer.

[0051] As shown in FIG. 4, the leg-around gather portion 41 is provided on both side portions of the lower crotch portion 50, specifically, along each leg-around opening LH. The leg gather portion 41 is provided such that the outer sheet 43 folded back in the left-right direction with the inner sheet 42 sandwiched therebetween extends outward in the lateral direction of the absorber 11. Further, the leg gather portion 41 includes a plurality of leg-around elastic members 44 extending along the vertical direction between the inner sheet 42 and the outer sheet 43 and on the non-skin side of the inner sheet 42. By the expansion and contraction of the leg-around elastic members 44, the leg-around gather portion 41 of the diaper 1 fits around the wearer's legs.

[0052] The outer cover sheet 45 may be a liquid-permeable sheet or a liquid-impermeable sheet, and examples thereof include a hydrophobic SMS nonwoven fabric.

[0053] <<<Regarding the antibacterial property of the diaper 1>>> Generally, an absorbent article provided with a superabsorbent polymer having a basis weight of 270 g / m 2 or more is suitable for long-term wear. And an absorbent article suitable for long-term wear has a thick absorber in order to absorb excreta due to multiple excretions, so that the inside of the absorbent article tends to become stuffy due to the thick absorber, or the price of the absorbent article tends to be higher than that of a normal absorbent article.

[0054] However, even if an absorbent article is worn for a long time, it does not necessarily absorb excreta such as feces and urine. For example, in the case of disposable diapers for infants used at night, as the age of the infant increases, there is a tendency that the infant does not excrete at night and the disposable diaper does not absorb urine or feces. In such a case, throwing away a disposable diaper in a state where it has not absorbed excreta may be felt to be a waste of resources, or throwing away an expensive disposable diaper in a state where it has not absorbed excreta may be felt to be a pity. Therefore, there has been a desire to let the infant wear the disposable diaper the next day. Also, in the case of disposable diapers or absorbent pads for adults, in order to obtain a sense of security, even when wearing a disposable diaper or absorbent pad to go to bed or go out, the absorbent pad may not absorb urine or feces. Even in such a case, for the same reason, there has been a desire to wear the absorbent pad after the next day.

[0055] In these cases, even if the absorbent article does not absorb excreta such as urine and feces, there has been a concern that bacteria may grow in the absorbent article by absorbing sweat absorbed from the skin of the wearer, which may have an adverse effect on the skin or cause unsanitary conditions.

[0056] On the other hand, the diaper 1 of the present embodiment has a liquid-absorbent absorber 11 and a skin-side sheet 12, and an adhesive 12x is provided between the absorber 11 and the skin-side sheet 12. The adhesive 12x can be applied in a well-known application pattern such as an Ω pattern, a spiral pattern, or a stripe pattern. In the present embodiment, the adhesive 12x is applied in an Ω pattern. The absorber 11 has a basis weight of 270 g / m 2It is provided with the above-mentioned superabsorbent polymer. And the skin-side sheet 12 is located on the skin side of the absorber 11 and is provided with the antibacterial agent R. Regarding this diaper 1, in a plan view in the deployed state and the extended state, as shown in FIG. 6, in the region overlapping the absorber 11, it has an adhesive portion 18 and a non-adhesive portion 19. In a plan view, the adhesive portion 18 is a region where the adhesive 12x exists, and the non-adhesive portion 19 is a region where no adhesive exists. And, in a plan view, it has a portion where the antibacterial agent R overlaps with the adhesive portion 18 and a portion where the antibacterial agent R overlaps with the non-adhesive portion 19. FIG. 6 is a diagram for explaining the adhesive portion 18 and the non-adhesive portion 19. FIG. 6 is a view of the absorber 11 and the skin-side sheet 12 in FIG. 2 as seen from the skin side. In FIG. 6, the adhesive portion 18 is a diagonally downward slanted line portion to the right, and the non-adhesive portion 19 is a portion without slanted lines.

[0057] FIG. 7 is a schematic diagram of a cross-section taken along the line D-D shown in FIG. 6. As shown in FIG. 7, the diaper 1 has an absorber 11 provided with a superabsorbent polymer having a basis weight of 270 g / m 2 Even in an absorbent article assuming long-term wearing having an absorber 11 provided with the above-mentioned superabsorbent polymer, in a plan view, the portion where the antibacterial agent R overlaps with the adhesive portion 18 can reduce the absorption of the antibacterial agent R provided on the skin-side sheet 12 by the absorber 11. If an antibacterial agent is provided only on the absorber, although the antibacterial agent exerts an antibacterial effect on urine and feces absorbed by the absorber, it is difficult to exert the antibacterial effect of the antibacterial agent on bacteria caused by sweat or the like adhering to the skin side surface rather than the absorber such as the skin-side sheet. On the other hand, when an antibacterial agent is provided on the skin-side sheet and there is no portion where the antibacterial agent and the adhesive portion overlap in a plan view, the antibacterial effect inside the absorber becomes weak. In contrast, in the diaper 1, in a plan view, as shown in FIG. 7, in the portion where the antibacterial agent R overlaps with the adhesive portion 18, even if the antibacterial agent R provided on the skin-side sheet tries to move in the direction of arrow r, the adhesive 12x easily prevents the movement of the antibacterial agent R to the non-skin side and serves as a lid, so that the risk of the antibacterial agent R being absorbed by the absorber 11 can be reduced. Thereby, due to the effect of the antibacterial agent R provided on the skin side of the absorber 11 when the diaper 1 is not absorbing excreta such as urine and feces, the reproduction of bacteria due to moisture between the absorber 11 and the wearer's skin from the wearer's sweat and the wearer's body temperature can be reduced.

[0058] On the other hand, in plan view, since the diaper 1 has a portion where the antibacterial agent R and the adhesive portion 18 do not overlap, the portion where the antibacterial agent R and the adhesive portion 18 do not overlap serves as a path for discharging the moisture inside the absorber 11 to the outside of the absorber 11. Since an air flow can be formed, the air permeability of the absorber 11 is improved. Then, the antibacterial agent R acts on the bacteria discharged from the absorber 11 by the air flow, making it easier to reduce the growth of bacteria inside the absorber 11. That is, in plan view, the portion where the antibacterial agent R and the adhesive portion 18 do not overlap is the portion where the adhesive 12x that obstructs the movement of the air discharged from the absorber 11 is not provided. Therefore, the air permeability of the absorber 11 is higher than the portion where the antibacterial agent R and the adhesive 12x overlap in plan view, and it becomes easier to suppress the growth of bacteria inside the absorber 11. Therefore, even when the diaper 1 is worn for a long time and no excretion such as urine or feces is taking place, the growth of bacteria can be reduced, reducing the adverse effects on the skin of the wearer due to wearing the diaper 1, and reducing the fear of giving the wearer and others the impression that the diaper 1 may become unhygienic due to long-term wear.

[0059] Also, in plan view in the deployed and extended state, in the region overlapping the absorber 11, by having the adhesive portion 18 and the non-adhesive portion 19, a portion where the adhesive 12x is provided and a portion where the adhesive 12x is not provided 12x are formed. Generally, the portion where the adhesive 12x is provided has higher rigidity than the portion where the adhesive 12x is not provided. Therefore, a difference in rigidity occurs at the boundary between the adhesive portion 18 and the non-adhesive portion 19. Due to this difference in rigidity, the diaper 1 is more likely to deform along the body of the wearer during wearing, improving the fit of the diaper 1.

[0060] In addition, when aiming to wear the diaper 1 for an even longer time, it is more preferable that the basis weight of the superabsorbent polymer provided in the absorber 11 be 300 g / m 2 or more.

[0061] In this embodiment, the adhesive 12x between the skin-side sheet 12 and the absorber 11 is used to join the skin-side sheet 12 and the absorber 11, but it is not limited to this. It is only necessary to have an adhesive between the skin-side sheet 12 and the absorber 11. For example, another member such as a second sheet may be provided between the skin-side sheet 12 and the absorber 11.

[0062] The antibacterial agent R of the diaper 1 is preferably a silver-based antibacterial agent. Generally, silver-based antibacterial agents tend to release silver ions in a humid environment. Silver ions are highly safe for the human body and can inactivate bacteria and suppress the growth of bacteria. Therefore, it is possible to reduce the adverse effects on the wearer's skin caused by wearing the diaper 1 and reduce the concern that the diaper 1 may become unhygienic due to long-term wearing.

[0063] The diaper 1 of this embodiment uses "Zeomic (silver zeolite)" as the antibacterial agent R. Zeomic (manufactured by Shinanen Zeomic Co., Ltd.) is a silver-based inorganic antibacterial agent and is a powdery antibacterial agent that combines silver ions and zeolite. Zeomic easily releases silver ions in a moisture environment, and the silver ions inhibit the growth of microorganisms by inhibiting the movement of enzymes in the metabolic system of the microorganisms. In this embodiment, the antibacterial agent R is kneaded into the fibers constituting the non-skin side layer 12b (described later) of the skin-side sheet 12, and the antibacterial agent R is randomly scattered throughout the non-skin side layer 12b. Note that the silver-based antibacterial agent is not limited to Zeomic (silver zeolite), and may be particles in which silver ions are supported on a carrier such as calcium phosphate.

[0064] Note that the antibacterial agent R for the diaper 1 is not limited to this. Well-known substances with antibacterial effects can be used. The antibacterial agent R may be a cationic antibacterial agent. Since cationic antibacterial agents have low toxicity to the human body and high safety, they can be used at high concentrations and the antibacterial effect can be enhanced. Examples of cationic antibacterial agents include quaternary ammonium salts (exemplified: alkyltrimethylammonium salts, polyoxyethylene alkylmethylammonium salts), guanidine-based antibacterial agents (exemplified: chlorhexidine gluconate, chlorhexidine hydrochloride), biguanide-based antibacterial agents (exemplified: polyaminopropylbiguanide hydrochloride, polyhexamethylene biguanide stearate), metal ion carriers (exemplified: metal salts such as silver nitrate and copper sulfate that can release metal ions such as silver ions and copper ions), hexetidine, metronidazole, etc. In addition, the antibacterial agent R may be an inorganic antibacterial agent containing inorganic substances such as Mn, Fe, Co, Ni, Cu, Zn, or an antibacterial substance containing natural materials such as tea leaves and coffee extraction residues.

[0065] As a method for providing the antibacterial agent R on the skin side sheet 12, it can be carried out by a well-known method. For example, it can be carried out by the following method. <Method for obtaining antibacterial fiber> A method of impregnating and drying a fiber in an antibacterial liquid which is a solution or dispersion containing one or more antibacterial components to fix the antibacterial component on the fiber surface, a method of applying and drying the antibacterial liquid on the fiber surface to fix the antibacterial component on the fiber surface, a method of adding one or more antibacterial components to a synthetic resin in a molten state and then spinning the synthetic resin, etc., can be used to obtain antibacterial fibers in which an antibacterial agent is kneaded into the fibers constituting the skin-side sheet 12. Examples of the fibers constituting the skin-side sheet 12 include cellulose fibers, synthetic fibers, etc. Specific examples of cellulose fibers include natural cellulose fibers such as pulp fibers, cotton fibers, hemp fibers, kenaf fibers, etc., chemically modified cellulose-containing fibers such as ethyl cellulose-containing fibers, hydroxyethyl cellulose-containing fibers, hydroxypropyl cellulose-containing fibers, methyl cellulose-containing fibers, ethyl hydroxyethyl cellulose-containing fibers, carboxymethyl cellulose-containing fibers, etc., and regenerated cellulose fibers. Examples of synthetic fibers include synthetic fibers spun from hydrophilic resins such as polyacrylamide, polyvinyl alcohol, crosslinked polyvinyl alcohol, chitin, chitosan, ethylene vinyl acetate copolymer, polyvinyl formal, etc., polyester-based fibers such as polyester fibers, polyethylene terephthalate (PET) fibers, and synthetic fibers such as polyolefin-based fibers such as polyethylene fibers and polypropylene fibers. Further, as the solvent of the antibacterial liquid, water, an organic solvent, a mixed solvent of water and an organic solvent, etc. can be appropriately selected and used. <Method of adding an antibacterial agent to the fibers constituting the skin-side sheet 12> A method of adding a hydrophilizing treatment agent containing an antibacterial agent to a synthetic resin and spinning the synthetic resin, a method of immersing natural fibers or synthetic resins in a hydrophilizing treatment liquid obtained by dissolving or dispersing a hydrophilizing treatment agent containing an antibacterial agent in an appropriate solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent for a predetermined time and then drying, a method of applying a hydrophilizing treatment liquid obtained by dissolving or dispersing a hydrophilizing treatment agent containing an antibacterial agent or a hydrophilizing treatment agent containing an antibacterial agent in an appropriate solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent to natural fibers or synthetic resins, etc., can be used to add a treatment agent (oil agent) containing an antibacterial agent to the fibers constituting the skin-side sheet 12. <Method of coating an antibacterial agent on the skin-side sheet 12> For the skin-side sheet 12 formed into a sheet shape by a well-known method, an antibacterial agent in a mist, liquid, or powder (solid) state may be provided on the skin-side sheet 12 by a well-known coating method.

[0066] The antibacterial property of the skin-side sheet 12 can be measured by a well-known method. For example, it can be measured by an antibacterial test according to the JIS L 1902:2015 method. It is preferable that the result by this measurement method shows an antibacterial activity value of 2 or more against Staphylococcus aureus and Escherichia coli. By having an antibacterial activity value of 2 or more against Staphylococcus aureus and Escherichia coli, the growth of bacteria on the skin-side sheet 12 can be suppressed more effectively than when the antibacterial activity value is less than 2.

[0067] Regarding the skin-side sheet 12 provided with the antibacterial agent R, it is preferable that the skin-side sheet 12 has a skin-side layer 12a located on the skin side and a non-skin-side layer 12b located on the non-skin side relative to the skin-side layer 12a, and it is preferable that the skin-side layer 12a and the non-skin-side layer 12b each include durable hydrophilic fibers. Even when the diaper 1 absorbs moisture such as sweat and urine during wearing, since the skin-side layer 12a and the non-skin-side layer 12b each include durable hydrophilic fibers, the risk of continuously retaining moisture in the skin-side sheet 12 can be reduced compared to the case where all of the skin-side layer 12a and the non-skin-side layer 12b are formed of general hydrophilic fibers. Also, even when the diaper 1 repeatedly absorbs moisture, the risk of a decrease in the absorption rate can be reduced. Therefore, even when the diaper 1 is worn for a long time, the risk of moisture remaining on the skin side of the diaper 1 can be reduced, and thus the risk of bacterial propagation on the skin side of the diaper 1 can be reduced. Note that the antibacterial agent R may be provided on at least one of the skin-side layer 12a or the non-skin-side layer 12b of the skin-side sheet 12.

[0068] The skin-side layer 12a of the skin-side sheet 12 of the present embodiment has a basis weight of 11 g / m 2 and is formed of durable hydrophilic fibers. The durable hydrophilic fibers of the skin-side layer 12a are a fiber layer of a composite fiber of PET (polyethylene terephthalate) / PP (polypropylene) 1 staple fiber. The non-skin side layer 12b of the skin side sheet 12 of the present embodiment has a basis weight of 11 g / m 2 and is formed of durable hydrophilic fibers. The durable hydrophilic fibers of the non-skin side layer 12b are a fiber layer in which composite fibers of PET / PP 1 raw cotton, PP / PET, and raw cotton fibers kneaded with an antibacterial agent R are mixed at a predetermined ratio. And the skin side sheet 12 is a sheet-shaped air-through nonwoven fabric by entangling (air-through) the fibers of the skin side layer 12a and the fibers of the non-skin side layer 12b. Since the skin side sheet 12 is an air-through nonwoven fabric, it is easy to enhance the liquid permeability of the skin side sheet 12 and quickly absorb moisture such as sweat on the surface of the skin side sheet 12.

[0069] The durable hydrophilic fibers and the general hydrophilic fibers are each obtained by treating natural fibers or synthetic fibers with a predetermined hydrophilic treatment agent to impart predetermined hydrophilicity. The treatment with the hydrophilic treatment agent includes, for example, a method of adding the hydrophilic treatment agent to a synthetic resin and spinning the synthetic resin, a method of dissolving or dispersing the hydrophilic treatment agent in a suitable solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent to obtain a hydrophilic treatment liquid, immersing natural fibers or synthetic resin in the hydrophilic treatment liquid for a predetermined time, and drying, a method of applying a hydrophilic treatment agent or a hydrophilic treatment liquid obtained by dissolving or dispersing the hydrophilic treatment agent in a suitable solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent to natural fibers or synthetic resin, and the like. The natural fibers are not particularly limited, and examples include cotton fibers and cellulose fibers. The synthetic fibers are not particularly limited, and examples include polyester fibers such as polyethylene terephthalate (PET) fibers, and polyolefin fibers such as polyethylene fibers and polypropylene fibers. Further, fibers spun from a hydrophilic resin may be used.

[0070] As hydrophilic treatment agents used for general hydrophilic fibers, for example, anionic surfactants such as sodium lauryl sulfonate and potassium lauryl phosphate can be mentioned. Among these, from the viewpoint of hydrophilicity, potassium lauryl phosphate is preferable. As treatment agents used for durable hydrophilic fibers, for example, castor oil derivatives can be mentioned. Specific examples of castor oil derivatives include, for example, polyoxyalkylene chain adducts of natural oils and fats such as castor oil and hydrogenated castor oil, or their fatty acid ester forms, polyoxyethylene stearyl ether, water-soluble modified silicone, and the like. Among these, from the viewpoint of productivity, polyoxyethylene hydrogenated castor oil is preferable.

[0071] The skin-side sheet 12 includes antibacterial fibers containing antibacterial agent R. The antibacterial fibers of the skin-side sheet 12 are not particularly limited as long as they have antibacterial properties and are suitable for the material of the diaper 1, but fibers carrying metal ions showing antibacterial properties on the inside and / or surface are preferable. A metal compound containing metal ions may be supported on an inorganic porous body and used. Examples of the supporting method include physical adsorption, chemical adsorption, ion exchange, vapor deposition, surface thin film formation, mechanical support, and the like. The metal ions showing antibacterial properties are not particularly limited, and examples include ions such as silver, copper, and zinc. Among these, silver ions showing an antibacterial effect even in extremely small amounts are preferable. Examples of the inorganic porous body include zeolite, hydrotalcite, hydroxyapatite, clay minerals, alumina, silica, bentonite, and the like. Also, an antibacterial organic compound (antibacterial agent) may be used. The antibacterial agent is not particularly limited, and examples include hinokitiol, cetylpyridinium chloride, chlorhexidine gluconate, isopropylmethylphenol, benzalkonium chloride, chlorhexidine hydrochloride, benzethonium chloride, triclosan, and the like. The antibacterial metal ions and the antibacterial agent can be used alone or in combination of two or more kinds, respectively.

[0072] In this embodiment, the skin-side layer 12a and the non-skin-side layer 12b are such that the layer containing the antibacterial agent R is the non-skin-side layer 12b, and the layer that does not contain the antibacterial agent R on the skin side of the non-skin-side layer 12b is the skin-side layer. As described above, the skin-side layer 12a of this embodiment is formed of composite fibers of PET / PP 1 raw cotton, and the non-skin-side layer 12b is formed by mixing composite fibers of PET / PP 1 raw cotton, PP / PET, and raw cotton fibers containing the antibacterial agent R. The skin-side layer 12a and the non-skin-side layer 12b can be distinguished by whether or not they contain the antibacterial agent R. If it is difficult to determine the distinction between the skin-side layer 12a and the non-skin-side layer 12b, the side closer to the skin than the center in the thickness direction of the skin-side sheet 12 may be defined as the skin-side layer 12a, and the side farther from the center in the thickness direction of the skin-side sheet 12 may be defined as the non-skin-side layer 12b.

[0073] Whether each hydrophilic fiber contained in the skin-side layer 12a and the non-skin-side layer 12b is a durable hydrophilic fiber or a general hydrophilic fiber is defined based on the results of the following hydrophilicity test. First, hydrophilic fibers are taken out from the skin-side layer 12a and the non-skin-side layer 12b respectively, and an air-through nonwoven fabric with a basis weight of 20 g / m 2 is produced using the hydrophilic fibers. 100 μL of 0.9% saline is dropped at the same position (for example, the center) of the obtained air-through nonwoven fabric every 30 seconds. Then, the number of drops when the dropped saline does not penetrate the air-through nonwoven fabrics and forms droplets on each air-through nonwoven fabric is measured. The hydrophilic fibers contained in the sample pieces with the number of drops being 1 or more and 8 or less are defined as general hydrophilic fibers, and the hydrophilic fibers contained in the sample pieces with the number of drops being 9 or more are defined as durable hydrophilic fibers.

[0074] Also, when the skin-side sheet 12 has the skin-side layer 12a and the non-skin-side layer 12b as in this embodiment, it is preferable that the antibacterial agent R is provided in the non-skin-side layer 12b. And it is more preferable that the antibacterial agent R is not provided on the skin side surface of the skin-side layer 12a. By providing the antibacterial agent R in the non-skin-side layer 12b, the risk that the antibacterial agent R directly touches the skin of the wearer can be reduced. Therefore, while reducing the growth of bacteria in the diaper 1 by the antibacterial agent R, it becomes difficult to give a stimulus to the skin of the wearer.

[0075] Regarding the non-skin side layer 12b provided with the antibacterial agent R, it has antibacterial fibers containing the antibacterial agent R. The antibacterial fibers of the present embodiment are raw cotton fibers in which the antibacterial agent R is kneaded. In this non-skin side layer 12b, the basis weight of the general hydrophilic fibers is preferably less than 7 g / m 2 More preferably, in the present embodiment, the non-skin side layer 12b does not include general hydrophilic fibers, and the basis weight of the general hydrophilic fibers is 0 g / m 2 Therefore, it is obvious that the basis weight of the non-skin side layer 12b is less than 7 g / m 2 Even when the basis weight of the general hydrophilic fibers in the non-skin side layer 12b is less than 7 g / m 2 It is possible to reduce the fear of giving the wearer and the like the concern that the diaper 1 may become unhygienic due to long-term wearing while reducing the adverse effects on the wearer's skin caused by wearing the diaper 1.

[0076] Further, when the skin side sheet 12 has antibacterial fibers containing the antibacterial agent R, the basis weight of the antibacterial fibers is preferably greater than 6 g / m 2 When the basis weight of the antibacterial fibers provided in the skin side sheet 12 is 6 g / m 2 Above, it is possible to reduce the fear of giving the wearer and the like the concern that the diaper 1 may become unhygienic due to long-term wearing while reducing the adverse effects on the wearer's skin caused by wearing the diaper 1.

[0077] In the unfolded and extended state of the diaper 1, it is preferable that the non-adhesive portion 19 has a longitudinally continuous portion. As shown in FIG. 6, in the diaper 1 of the present embodiment, the non-adhesive portion 19 is continuous along the longitudinal direction from the upper end to the lower end of the absorber 11. The adhesive portion 18 and the non-adhesive portion 19 are also the portions where the adhesive 12x is provided and the portions where the adhesive 12x is not provided. Therefore, a difference in rigidity is likely to occur at the boundary between the adhesive portion 18 and the non-adhesive portion 19, and the absorber 11 is likely to bend starting from the edge of the non-adhesive portion 19. Thereby, the diaper 1 can be easily deformed along the wearer's body during wearing, improving the fit of the diaper 1, and the longitudinally continuous non-adhesive portion 19 can improve the air permeability of the absorber 11 from the ventral side to the dorsal side during wearing, so that it is easy to reduce the risk of bacteria breeding inside the absorber 11.

[0078] Regarding the adhesive portion 18 and the non-adhesive portion 19, in the unfolded and extended state of the diaper 1, it is preferable that the total area of the adhesive portion 18 is larger than the total area of the non-adhesive portion 19. Thereby, it is possible to reduce the absorption of the antibacterial agent R provided on the skin-side sheet 12 by the absorber 11 compared to the case where the total area of the adhesive portion 18 is smaller than the total area of the non-adhesive portion 19. Therefore, it is easy to reduce the growth of bacteria due to moisture between the absorber 11 and the wearer's skin when the diaper 1 is not absorbing excreta such as feces and urine.

[0079] Further, in the unfolded and extended state of the diaper 1, it is preferable that the antibacterial agent R is provided at least at the lateral ends of the skin-side sheet 12, and it is preferable that the lateral ends of the skin-side sheet 12 cover at least a part of the side surface of the absorber 11 and the non-skin side surface of the absorber 11. As shown in FIG. 7 and the like, the skin-side sheet 12 of the diaper 1 of the present embodiment covers the skin-side surface of the absorber 11 in the lateral direction, and the lateral ends of the skin-side sheet 12 are folded back toward the non-skin side to cover the side surface of the absorber 11 and both lateral ends of the absorber 11 in the lateral direction, respectively. And as described above, the antibacterial agent R is provided over the entire area of the skin-side sheet 12. Therefore, not only the skin-side surface of the absorber 11 but also the side surface of the absorber 11 and the non-skin side surface of the absorber 11 are likely to exhibit the effect of the antibacterial agent R, so that the growth of bacteria inside the absorber 11 can be easily reduced.

[0080] In the above-described embodiment, the absorbent core 12 (absorber 11) is an absorbent core having a substantially rectangular shape and a substantially uniform basis weight, but it is not limited thereto. For example, the absorbent core 12 may have a low basis weight region where the basis weight is lower than that of the surroundings, and in the unfolded and extended state of the diaper 1, a configuration may be adopted in which a non-adhesive portion 19, the antibacterial agent R, and a low basis weight region of the absorbent core 12a overlap. The low basis weight region of the absorbent core 11a may be a portion where the basis weight is lower than that of the surroundings (so-called low basis weight region), or may be a slit penetrating in the thickness direction. Since the low basis weight region of the absorbent core 11a (absorber 11) has lower rigidity than its surroundings, the portion where the difference in rigidity occurs causes the absorbent core 11a (absorber 11) to fold along the low basis weight region, so that it is easily deformed along the wearer's body during wearing. Further, since the low basis weight region of the absorbent core 12a has higher air permeability than its surroundings, heat and air inside the absorbent core 12 (absorber 11) are easily released to the outside. Therefore, in plan view, the overlap of the non-adhesive portion 19, the antibacterial agent R, and the low basis weight region can reduce the risk of bacteria growing inside the absorber 11.

[0081] As described above, the absorber 11 includes an absorbent core 11a and a core wrap sheet 11b that covers the absorbent core 11a. As shown in FIG. 5, the core wrap sheet 11b has a skin-side portion 11bu that covers the skin side of the absorbent core 11a and a non-skin-side portion 11bb that covers the non-skin side of the absorbent core 11a. FIG. 8A is a view of the absorber 11 in FIG. 2 as seen from the skin side. As shown in FIG. 8A, between the absorbent core 11a and the skin-side portion 11bu, there are provided a core-side joint portion 16 joined by an adhesive (core-side adhesive) 11x and a core-side non-joint portion 17 not joined by the adhesive 11x. In FIG. 8A, the core-side joint portion 16 is indicated by a left-downward diagonal hatched portion, and the non-hatched area is shown as the core-side non-joint portion 17. In the plan view of the diaper 1 in the deployed and stretched state with such an absorber 11, there is a portion where the antibacterial agent R, the non-adhesive portion 19, and the core-side non-joint portion 17 overlap. In the present embodiment, since the non-adhesive portions 19 between the skin-side sheet portion 12 and the absorber 11 are continuous from the front end to the rear end in the longitudinal direction of the absorber 11 (see FIG. 6), and the core-side non-joint portions 17 are continuous from the front end to the rear end in the longitudinal direction of the absorber 11 (see FIG. 8A), the portion where the adhesive 12x is not provided in the left-right direction in FIG. 5 corresponds to the non-adhesive portion 19, and the portion where the adhesive 11ux is not provided in the left-right direction in FIG. 5 corresponds to the core-side non-adhesive portion 17. Further, in the present embodiment, since the antibacterial agent is randomly kneaded throughout the entire skin-side sheet 12 (non-skin-side layer 12b), in the plan view of the diaper 1 in the deployed and stretched state, there is a portion where the antibacterial agent R, the non-adhesive portion 19, and the core-side non-joint portion 17 overlap. Thereby, in the plan view, the air permeability is improved compared to the case where all the adhesive portions 18 and the core-side joint portion 16 overlap, and since the portion where the non-adhesive portion 19 and the core-side non-joint portion 17 overlap also overlaps with the antibacterial agent R, it becomes easier to reduce the propagation of bacteria inside the absorber 11 while improving the air permeability of the absorber 11.

[0082] Further, it is preferable to provide a ventilation film on the non-skin side of the absorber 11. In the present embodiment, for example, the non-skin side sheet 15 may be used as the ventilation film. The ventilation film is a sheet member that does not allow liquid to pass through but allows gas to pass through. When the non-skin side sheet 15 is used as the ventilation film, an adhesive (film side adhesive) 15x is provided between the absorber 11 and the non-skin side sheet 15. In this case, in a plan view of the diaper 1 in the deployed and extended state, in the region overlapping the absorber 11, there are a non-skin side adhesive portion (ventilation film side adhesive portion) 15s which is the region where the adhesive 15x exists, and a non-skin side non-adhesive portion (ventilation film side non-adhesive portion) 15h which is the region where the adhesive 15x does not exist. FIG. 8B is a diagram for explaining the absorber 11 and the non-skin side sheet 15 in FIG. 2. In FIG. 8B, for convenience, the non-skin side sheet 15 and the non-skin side adhesive portion 15s are shown by solid lines, and the absorber 11 is shown by a dotted line. Also, in FIG. 8B, the non-skin side adhesive portion 15s is shown by a diagonally downward right slanted hatched portion, and the region without hatching is shown as the non-skin side non-adhesive portion 15h. As shown in FIGS. 6 and 8B, in a plan view of the diaper 1 in the deployed and extended state, it is preferable that the non-skin side non-joined portion 15h per unit area is larger than the non-adhesive portion 19 per unit area. Since the non-skin side non-joined portion 15h per unit area is larger than the non-adhesive portion 19 per unit area, the non-skin side non-adhesive portion 15h side, which is the non-skin side of the diaper 1, more easily releases moisture from the absorber 11 to the outside than the non-adhesive portion 19 on the skin side sheet 12 side, which is the skin side of the diaper 1. Thereby, the growth of bacteria due to moisture between the absorber 11 and the skin of the wearer can be reduced.

[0083] Further, in a plan view of the disposable diaper 1 in the unfolded and extended state, it is preferable that the total amount of the antibacterial agent R overlapping the adhesive portion 18 is larger than the total amount of the antibacterial agent R overlapping the non - adhesive portion 19. The "total amount of the antibacterial agent R" refers to the sum of the weights of the antibacterial agent R in each part. In a plan view, since the total amount of the antibacterial agent R overlapping the adhesive portion 18 is larger than the total amount of the antibacterial agent R overlapping the non - adhesive portion 19, it is possible to reduce the absorption of the antibacterial agent R provided on the skin - side sheet 12 by the absorber 11 compared to the case where the total amount of the antibacterial agent R overlapping the adhesive portion 18 is made smaller than the total amount of the antibacterial agent R overlapping the non - adhesive portion 19. Therefore, it becomes easier to reduce the growth of bacteria between the absorber 11 and the skin of the wearer when the disposable diaper 1 is not absorbing excreta such as feces and urine.

[0084] The total amount of the antibacterial agent R can be measured by a well - known method. For example, it can be measured by the following method. First, using a cold spray, weaken the adhesive force of the adhesive that joins the components of the disposable diaper 1, carefully peel off the components, and take out the skin - side sheet 12. Divide the taken - out skin - side sheet 12 into a portion overlapping the adhesive portion 18 and a portion overlapping the non - adhesive portion 19. Then, perform an antibacterial agent extraction treatment on each of the portion overlapping the adhesive portion 18 and the portion overlapping the non - adhesive portion 19. For the antibacterial agent extraction treatment, put the above - mentioned each portion into methanol as a solvent, perform vibration and stirring by ultrasonic waves on the solvent, then filter the supernatant of the solvent with a solvent - based filter (manufactured by Kanto Chemical Co., Ltd., made of PTFE resin, pore diameter 0.45 μm, 25 mmφ), and volatilize the solvent in the filtrate to obtain a solid content. Separate the obtained solid content using a well - known analysis means such as liquid chromatography so as to obtain a single compound. Identify the chemical structure of the obtained compound using well - known analysis means such as infrared absorption spectroscopy and nuclear magnetic resonance spectroscopy. Using an agent having the identified chemical structure as a standard substance, and using well - known analysis means such as gas chromatography and liquid chromatography, the total amount of the antibacterial agent R in each part can be quantified from the calibration curve.

[0085] When it is difficult to perform the measurement using the above liquid chromatography or the like, it may be measured by inductively coupled spectroscopic analysis (ICP-MS) or the like, which is well-known as a method for measuring inorganic chemical substances. For example, the measurement method using inductively coupled spectroscopic analysis (ICP-MS) can be performed as follows. First, for each part that overlaps with the adhesive part 18 and the part that overlaps with the non-adhesive part 19, the amount to be cut out as a sample piece is determined according to the constraints of the analyzer in order to perform the antibacterial agent extraction treatment on each part. Each sample piece is subjected to acid treatment for the decomposition of organic chemical substances coexisting with metals and the elution of metals. As the acid, hydrochloric acid, nitric acid, sulfuric acid, perchloric acid, hydrofluoric acid, etc. are added alone or in combination, and a wet decomposition method of heating on a hot plate and a method of adding acid and heating and pressurizing in a sealed Teflon container are used. Thereafter, if necessary, an operation for removing interfering substances such as distillation is performed to prepare a sample from which the target antibacterial agent R is extracted. For this sample, the amount of metal ions (Ag) is measured using inductively coupled spectroscopic analysis (ICP-MS). The total amount of the antibacterial agent R can be calculated from the obtained metal ions (Ag ions).

[0086] On the other hand, in a plan view of the diaper 1 in the deployed and extended state, the total amount of the antibacterial agent R overlapping with the adhesive part 18 may be less than the total amount of the antibacterial agent R overlapping with the non-adhesive part 19. In a plan view, since the total amount of the antibacterial agent R overlapping with the adhesive part 18 is less than the total amount of the antibacterial agent R overlapping with the non-adhesive part 19, a ventable area can be provided wider than when the total amount of the antibacterial agent R overlapping with the adhesive part 18 is made larger than the total amount of the antibacterial agent R overlapping with the non-adhesive part 19. Therefore, it becomes easier to discharge the moisture inside the absorber 11 to the outside, and it becomes easier to reduce the growth of bacteria inside the absorber 11.

[0087] The above embodiments are for facilitating the understanding of the present invention and are not for limiting the interpretation of the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are included in the present invention.

Description of Symbols

[0088] 1 Diaper (pants-type disposable diaper, absorbent article), 10 Absorbent body, 11 Absorbent body, 11a Absorbent core, 11b Core wrap sheet, 11x Adhesive (core-side adhesive), 12 Skin-side sheet, 12a Skin-side layer, 12b Non-skin-side layer, 12x Adhesive, 13 Leakage-preventing wall forming sheet, 13a Leakage-preventing wall elastic member, 13b Leakage-preventing wall portion, 15 Non-skin-side sheet (breathable film), 15x Adhesive (film-side adhesive, breathable film-side adhesion portion), 15h Non-skin-side non-adhesion portion (breathable film-side non-adhesion portion), 16 Core-side joining portion, 17 Core-side non-joining portion, 18 Adhesion portion, 19 Non-adhesion portion, 20 Front torso circumference portion, 21 Inner layer sheet, 22 Outer layer sheet, 23 Torso circumference elastic member, 30 Rear torso circumference portion, 31 Inner layer sheet, 32 Outer layer sheet, 33 Torso circumference elastic member, 40 Side joining portion, 41 Leg circumference gather portion, 42 Inner side sheet, 43 Outer side sheet, 44 Leg circumference elastic member, 45 Exterior sheet, 50 Crotch portion, LH Leg circumference opening, BH Torso circumference opening, R Adhesive

Claims

1. A liquid-absorbent absorber, A skin-side sheet located on the skin side of the absorber, An absorbent article having: The absorber includes a superabsorbent polymer having a basis weight of 270 g / m ２ or more, The skin-side sheet is provided with an antibacterial agent, An adhesive is provided between the absorber and the skin-side sheet, In a plan view of the absorbent article in a deployed and stretched state, In a region overlapping the absorber, there is an adhesive portion where the adhesive exists and a non-adhesive portion where the adhesive does not exist, Having a portion where the antibacterial agent overlaps with the adhesive portion, and Having a portion where the antibacterial agent overlaps with the non-adhesive portion An absorbent article characterized by the above.

2. The absorbent article according to claim 1, In the deployed and stretched state, Having a longitudinal direction, a lateral direction, and a thickness direction that intersect each other, An absorbent article characterized by comprising a portion where the non-adhesive portion is continuous in the longitudinal direction.

3. The absorbent article according to claim 1 or 2, The absorber has a low basis weight region where the basis weight is lower than the surroundings, In a plan view of the absorbent article in a deployed and stretched state, having a portion where the non-adhesive portion, the antibacterial agent, and the low basis weight region overlap.

4. The absorbent article according to claim 1 or 2, The antibacterial agent is a silver-based antibacterial agent.

5. The absorbent article according to claim 1 or 2, The antibacterial agent is a cationic antibacterial agent.

6. The absorbent article according to claim 1 or 2, The skin-side sheet has a skin-side layer located on the skin side and a non-skin-side layer located non-skin-side of the skin-side layer, The skin-side layer and the non-skin-side layer each comprise durable hydrophilic fibers.

7. The absorbent article according to claim 1 or 2, The skin-side sheet has a skin-side layer located on the skin side and a non-skin-side layer located non-skin-side of the skin-side layer, The antibacterial agent is provided in the non-skin-side layer.

8. The absorbent article according to claim 1 or 2, The absorber has an absorbent core and a core wrap sheet covering at least the skin-side surface of the absorbent core, Between the absorbent core and the core wrap sheet, there are a core-side joint portion joined by a core-side adhesive and a core-side non-joint portion not joined by a core-side adhesive. In a plan view of the absorbent article in the deployed and stretched state, the antibacterial agent, the non-adhesive part, and the non-joint part on the core side have overlapping parts, and the absorbent article is characterized by this.

9. The absorbent article according to claim 1 or 2, wherein a ventilation film is provided on the non-skin side of the absorber, a film-side adhesive is provided between the absorber and the ventilation film, in a plan view of the absorbent article in the deployed and stretched state, in a region overlapping with the absorber, there are a ventilation film-side adhesive part, which is a region where the film-side adhesive exists, and a ventilation film-side non-adhesive part, which is a region where the film-side adhesive does not exist, The absorbent article is characterized in that the ventilation film-side non-adhesive part per unit area is larger than the non-adhesive part per unit area.

10. The absorbent article according to claim 1 or 2, in the deployed and stretched state, having a longitudinal direction, a lateral direction, and a thickness direction that intersect each other, the antibacterial agent is provided at least at the lateral end of the skin-side sheet, The absorbent article is characterized in that the lateral end of the skin-side sheet covers at least a part of the side surface and the non-skin side surface of the absorber.

11. The absorbent article according to claim 1 or 2, in a plan view of the absorbent article in the deployed and stretched state, the total amount of the antibacterial agent overlapping with the adhesive part is more than the total amount of the antibacterial agent overlapping with the non-adhesive part, and the absorbent article is characterized by this.

12. The absorbent article according to claim 1 or 2, in a plan view of the absorbent article in the deployed and stretched state, the total amount of the antibacterial agent overlapping with the adhesive part is less than the total amount of the antibacterial agent overlapping with the non-adhesive part, and the absorbent article is characterized by this.

13. The absorbent article according to claim 1 or 2, in a plan view of the absorbent article in the deployed and stretched state, the total area of the adhesive part is larger than the total area of the non-adhesive part, and the absorbent article is characterized by this.

14. The absorbent article according to claim 1 or 2, the skin-side sheet has a skin-side layer located on the skin side and a non-skin-side layer located on the non-skin side of the skin-side layer, the non-skin-side layer has general hydrophilic fibers and antibacterial fibers provided with the antibacterial agent, The basis weight of the general hydrophilic fibers of the non-skin side layer is less than 7 g / m ２ The absorbent article is characterized in that it is smaller.

15. The absorbent article according to claim 1 or 2, the skin-side sheet has antibacterial fibers provided with the antibacterial agent, The basis weight of the antibacterial fiber is more than 6 g / m². ２ An absorbent article characterized in that it is larger.

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