Underwear-type sanitary pad

Abstract

The purpose of the present disclosure is to provide an underwear-type sanitary pad capable of preventing menstrual blood or the like from adhering to other articles even when the menstrual blood or a partial component of the menstrual blood is transmitted through a liquid impermeable sheet.　This underwear-type sanitary pad (1) comprises an absorbent body (3) and an exterior body (5), the underwear-type sanitary pad being characterized in that: the absorbent body (3) includes a top sheet (21), an absorbent core (27a), and a liquid-impermeable sheet (29) formed from a moisture-permeable film; the absorbent body (3) has an oily component arrangement region (41) in which an oily component is arranged on a skin-side sheet including the top sheet (21) or the absorbent core (27a); and the underwear-type sanitary pad (1) includes a hydrophobic nonwoven fabric sheet (35) that is present in the oily component arrangement region (41) in plan view in the deployed state and is disposed on the non-skin side of the liquid-impermeable sheet (29).

Description

Shorts-type napkins

[0001] The present disclosure relates to shorts-type napkins.

[0002]

[0003] For example, Patent Document 1 discloses a pants-type absorbent article having a liquid-absorbent main body having a vertical direction, a horizontal direction, and a front-to-rear direction that intersect with each other, and an outer body that includes a waistband that is stretchable in the horizontal directions and is arranged to cover the non-skin side of the absorbent main body, wherein a volatile cooling agent is applied to the absorbent main body, and both longitudinal end portions of the absorbent main body, as viewed in the front-to-rear direction, include at least one main body-side end sheet portion that constitutes the absorbent main body and at least one outer body-side sheet portion that constitutes the outer body, and when the waistband is stretched in the horizontal direction, joining regions that join adjacent sheet portions in the front-to-rear direction of the main body-side end sheet portion and the outer body-side sheet portion are provided intermittently in the horizontal direction.

[0003] Furthermore, a drug is applied to the top sheet of a sanitary napkin. For example, Patent Document 2 discloses an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body between the liquid-permeable top sheet and the liquid-impermeable back sheet, wherein the liquid-permeable top sheet has an uneven structure including convex portions and concave portions on the skin-contacting surface, and the liquid-permeable top sheet has a thickness of 0.01 to 80 mm at 40° C. at least on the convex portions in the excretory opening-contacting region. 2 The absorbent article is characterized by comprising a blood slipping agent having a kinematic viscosity of 1000 / s, a water holding percentage of 0.01 to 4.0 mass %, and a weight-average molecular weight of less than 1,000.

[0004] JP 2021-164529 A International Publication No. 2013 / 129236

[0005] The shorts-type napkin according to the present disclosure is not disclosed in Patent Documents 1 and 2. Therefore, an object of the present disclosure is to provide a shorts-type napkin that can prevent menstrual blood or some components of menstrual blood from adhering to other articles even if the menstrual blood or some components of the menstrual blood pass through a liquid-impermeable sheet.

[0006] The present inventors have discovered a shorts-type napkin comprising an absorbent main body having a longitudinal direction and a width direction, and an outer body, wherein, in an unfolded state, the shorts-type napkin has the longitudinal direction, the width direction, and a thickness direction having an inner and outer side that are perpendicular to each other, and is partitioned into a ventral region located closer to the front end from the center of the longitudinal direction, and a dorsal region located closer to the rear end from the center of the longitudinal direction, the absorbent main body comprising an absorbent core, a liquid-permeable skin-side sheet located on the skin side of the absorbent core, and a liquid-impermeable sheet composed of a moisture-permeable film located on the non-skin side of the absorbent core, the absorbent main body having an oily component placement region in which an oily component is placed on the skin-side sheet or the absorbent core, and the shorts-type napkin comprises a hydrophobic nonwoven fabric sheet that is present in the oily component placement region and is located on the non-skin side of the liquid-impermeable sheet when viewed from above in the unfolded state.

[0007] The shorts-type napkin according to the present disclosure can prevent menstrual blood or some components of menstrual blood from adhering to other articles even if the menstrual blood or some components of the menstrual blood pass through the liquid-impermeable sheet.

[0008] FIG. 1 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 2 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 3 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 4 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 5 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 6 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 7 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment. FIG. 8 is a diagram illustrating a shorts-type napkin 1 according to the first embodiment.

[0009] Specifically, the present disclosure relates to the following aspects: [Aspect 1] A shorts-type napkin comprising an absorbent main body having a longitudinal direction and a width direction, and an outer body, wherein, in a flattened state, the shorts-type napkin has the longitudinal direction, the width direction, and a thickness direction having an inner and outer side that are perpendicular to each other, and is partitioned into a ventral region located closer to the front end than the center in the longitudinal direction, and a dorsal region located closer to the rear end than the center in the longitudinal direction, the absorbent main body comprising an absorbent core, a liquid-permeable skin-side sheet located on the skin side of the absorbent core, and a liquid-impermeable sheet composed of a moisture-permeable film located on the non-skin side of the absorbent core, the absorbent main body having an oily component-disposing region in which an oily component is disposed on the skin-side sheet or the absorbent core, and the shorts-type napkin comprising a hydrophobic nonwoven fabric sheet that is present in the oily component-disposing region and located on the non-skin side of the liquid-impermeable sheet in a plan view in the flattened state.

[0010] The inventors of the present application have found the following problems. - In the case of ordinary sanitary napkins that are placed as part of shorts, the wearer is relatively unlikely to feel stuffy from the sanitary napkin itself, so from the perspective of suppressing leakage, a liquid-impermeable sheet that does not have moisture permeability is generally used. - In the case of shorts-type napkins such as those disclosed in Patent Document 1, the absorbent body has a relatively large area, making the wearer prone to feeling stuffy, so the use of a moisture-permeable film, for example a moisture-permeable film with perforations, as the liquid-impermeable sheet has been considered.

[0011] Furthermore, in shorts-type napkins, the excretion opening and the top sheet of the absorbent body are easily separated, which can make it difficult for menstrual blood to transfer from the top sheet to the absorbent core, for example, when the wearer is lying down. Coating the top sheet of a shorts-type napkin with an oily component (blood slipping agent) as disclosed in Patent Document 2 to improve the absorbency of the absorbent core improves menstrual blood absorption, but it has been found that after the oily component, which has lipophilic properties, slides down to the absorbent core along with the menstrual blood, it passes through a liquid-impermeable sheet with fine openings to provide moisture permeability, along with the menstrual blood or some components of the menstrual blood, resulting in red discoloration of the outer parts of the liquid-impermeable sheet. The passage of the oily component, together with the menstrual blood or some components of the menstrual blood, through a liquid-impermeable sheet made of a moisture-permeable film with openings is sometimes referred to as "menstrual blood permeability." The above-mentioned "menstrual blood or some components of the menstrual blood" is sometimes referred to as "menstrual blood, etc."

[0012] Although the mechanism of the menstrual blood permeability is not entirely clear, it is presumed to be due to the fact that oily or amphiphilic oily components with low polarity easily pass through the fine pores in the liquid-impermeable sheet along with menstrual blood or some components of menstrual blood. Because the shorts-type napkin is equipped with a hydrophobic nonwoven fabric sheet placed on the non-skin side of the liquid-impermeable sheet, even if menstrual blood or the like passes through the liquid-impermeable sheet, the menstrual blood permeability makes it difficult for the menstrual blood to reach outside the hydrophobic nonwoven fabric sheet, thereby preventing the menstrual blood or the like from adhering to other articles.

[0013] [Aspect 2] The shorts-type napkin according to Aspect 1, wherein the hydrophobic nonwoven fabric sheet is disposed adjacent to the non-skin side of the liquid-impermeable sheet. In the shorts-type napkin, the hydrophobic nonwoven fabric sheet is disposed adjacent to the non-skin side of the liquid-permeable sheet. Therefore, even if menstrual blood or the like passes through the liquid-impermeable sheet, the hydrophobic nonwoven fabric sheet directly prevents the menstrual blood from moving outward from the hydrophobic nonwoven fabric sheet without diffusing the menstrual blood or the like that has passed through the liquid-permeable sheet onto other sheets or the like, thereby preventing the menstrual blood or the like from adhering to other articles.

[0014] [Aspect 3] The shorts-type napkin according to Aspect 1 or 2, wherein, in the oily component-disposing region in the unfolded state as viewed from above, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at inter-film nonwoven fabric joints that are arranged intermittently in the longitudinal direction and / or the width direction.

[0015] In the above-mentioned shorts-type napkin, within the oily component placement area when viewed in a plane in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined directly or indirectly at a predetermined film-nonwoven fabric joint. Therefore, in the areas where the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are not joined, for example, voids are more likely to form between them, making it more difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability to reach outside the hydrophobic nonwoven fabric sheet, and ultimately preventing menstrual blood, etc. from adhering to other articles.

[0016] [Aspect 4] The shorts-type napkin according to any one of Aspects 1 to 3, wherein the hydrophobic nonwoven fabric sheet comprises a high-density layer disposed on the skin side, and a low-density layer disposed adjacent to the high-density layer on the non-skin side and having a lower density than the high-density layer.

[0017] The hydrophobic nonwoven fabric sheet has a predetermined high-density layer and a low-density layer, and is therefore permeable to menstrual blood, so that the high-density layer retains menstrual blood that has permeated the liquid-impermeable sheet, making it less likely to transfer to the adjacent low-density layer on the outside, thereby preventing menstrual blood and the like from adhering to other articles.

[0018] [Aspect 5] The shorts-type napkin according to Aspect 4, wherein the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at a film-nonwoven fabric joint, and the hydrophobic nonwoven fabric sheet further comprises a low-density layer having a lower density than the high-density layer, disposed adjacent to the high-density layer on the skin side.

[0019] Since the above-mentioned shorts-type napkin has a specified film-nonwoven fabric joint, the absorbent body is less likely to twist than when the film-nonwoven fabric joint is not provided, and tearing of the liquid-impermeable sheet due to friction between the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet can be suppressed.

[0020] Furthermore, because the shorts-type napkin has a predetermined low-density layer, oily components that have permeated the liquid-impermeable sheet due to menstrual blood permeability can be transferred from the low-density layer to the high-density layer, and the oily components can be prevented from reducing the bond strength of the joint between the film and nonwoven fabrics (for example, the joint bonded by hot melt adhesive). As a result, in the shorts-type napkin, the joint between the film and nonwoven fabrics can prevent twisting of the absorbent body, tearing of the liquid-impermeable sheet, etc., and the bond strength of the joint between the film and nonwoven fabrics is less likely to decrease.

[0021] [Aspect 6] The shorts-type napkin according to any one of Aspects 1 to 5, wherein the hydrophobic nonwoven fabric sheet has a plurality of embossed portions, and at least some of the plurality of embossed portions are recessed inward.

[0022] The shorts-type napkin has an embossed portion that is recessed inward. The embossed portion has a higher density than the portions other than the embossed portion. The embossed portion that is recessed inward is located closer to the inside (skin side) and has voids at a position closer to the outside (non-skin side). Therefore, the embossed portion that is recessed inward is permeable to menstrual blood and retains menstrual blood that has permeated the liquid-impermeable sheet in the embossed portion, making it difficult for the menstrual blood retained by the embossed portion to reach outside the nonwoven fabric sheet, thereby preventing menstrual blood and the like from adhering to other articles.

[0023] [Aspect 7] The shorts-type napkin according to any one of Aspects 1 to 6, wherein the shorts-type napkin is provided with an additional hydrophobic nonwoven fabric sheet that is present within the oily component distribution area and is positioned adjacent to the hydrophobic nonwoven fabric sheet on the non-skin side when viewed from above in the unfolded state.

[0024] The above-mentioned shorts-type napkin is provided with a specified additional hydrophobic nonwoven fabric sheet, so that menstrual blood and the like that has permeated the liquid-impermeable sheet due to its menstrual blood permeability is less likely to reach the outside through the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, thereby preventing menstrual blood and the like from adhering to other articles.

[0025] [Aspect 8] The shorts-type napkin according to Aspect 7, wherein, in the oily component-disposing region in the unfolded state as viewed from above, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are joined at inter-nonwoven fabric joints that are arranged intermittently in the longitudinal direction and / or the width direction.

[0026] In the above-mentioned shorts-type napkin, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are joined at a predetermined inter-nonwoven fabric joint, so that gaps are likely to form between the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the areas where they are not joined, making it difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability to reach outside the additional hydrophobic nonwoven fabric sheet, thereby preventing menstrual blood, etc. from adhering to other articles.

[0027] [Aspect 9] The shorts-type napkin according to Aspect 8, wherein in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at film-nonwoven fabric joints that are arranged intermittently in the longitudinal direction and / or the width direction, and the film-nonwoven fabric joints and the nonwoven fabric joints have non-overlapping joint portions that do not overlap with each other in the thickness direction.

[0028] In the above-mentioned shorts-type napkin, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet have a predetermined non-overlapping joint portion, and therefore, a gap is often formed between the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet outside the joint between the film nonwoven fabrics between the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet, and a gap is often formed between the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet inside the joint between the nonwoven fabrics between the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, so that menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability is less likely to reach outside the additional hydrophobic nonwoven fabric sheet, thereby preventing menstrual blood, etc. from adhering to other articles.

[0029] [Aspect 10] The shorts-type napkin according to any one of Aspects 7 to 9, wherein the shorts-type napkin comprises the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back region when viewed from above in the unfolded state.

[0030] The shorts-type napkin includes a hydrophobic nonwoven sheet and an additional hydrophobic nonwoven sheet in the back region, which is prone to body pressure during sleep, etc. Therefore, in the back region, menstrual blood and the like that has permeated the liquid-impermeable sheet is less likely to reach the outside than the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet due to the menstrual blood permeability, thereby preventing menstrual blood and the like from adhering to other articles.

[0031] [Aspect 11] The shorts-type napkin according to any one of Aspects 1 to 10, wherein the absorbent main body further comprises a core wrap covering the absorbent core from the liquid-impermeable sheet side, and within the oily component-disposing region in a plan view in the unfolded state, the core wrap and the liquid-impermeable sheet are joined at core wrap joints that are intermittently arranged in the longitudinal direction and / or the width direction.

[0032] In the shorts-type napkin, the core wrap and the liquid-impermeable sheet have a predetermined core wrap joining portion. Therefore, in the portion where the core wrap and the liquid-impermeable sheet are not joined, a gap is likely to be formed between them, making it difficult for oily components and menstrual blood to reach the liquid-impermeable sheet from the core wrap, making it difficult for menstrual blood to permeate, and ultimately preventing menstrual blood from adhering to other articles.

[0033] [Aspect 12] The shorts-type napkin according to any one of aspects 1 to 11, further comprising an oil-absorbent or oil-retaining sheet between the absorbent core and the liquid-impermeable sheet.

[0034] Since the above-mentioned shorts-type napkin further comprises a sheet having a predetermined oil absorption or oil retention property, oily components that reach the absorbent core can be retained by the sheet, making it difficult for the oily components to pass through the liquid-impermeable sheet and making it difficult for menstrual blood to pass through.

[0035] [Aspect 13] The shorts-type napkin according to any one of Aspects 1 to 12, wherein the shorts-type napkin comprises an elastic member that is disposed on the non-skin side of the absorbent core and that is arranged in the longitudinal direction from the ventral region to the dorsal region, and in the unfolded state, the oily component-disposing region and the elastic member overlap in the thickness direction.

[0036] The inventors of the present application have found the following problems: - When a chemical agent as disclosed in Patent Document 1 is applied to the top sheet of a shorts-type napkin in order to increase the absorbency of the absorbent core, the excretion opening and the top sheet of the absorbent main body tend to separate easily in shorts-type napkins, which can cause menstrual blood to flow over the surface of the top sheet, particularly in the early stages of wearing the napkin, leading to leakage (hereinafter, this may be referred to as "initial surface flow").

[0037] - Initial surface flow is unlikely to occur once a path has been created for menstrual blood to enter the absorbent core from the top sheet, but before this path is created, if no force such as body pressure is applied to the menstrual blood, depending on the posture, it is thought that this is due to the fact that the menstrual blood is more likely to slide down the surface of the top sheet than slide down into the top sheet. In the above-mentioned shorts-type napkin, because the oily component-distributing region and the elastic member overlap in the thickness direction in the unfolded state, the elastic member makes it easier for the absorbent core to abut against the excretory opening, making it easier for menstrual blood to slide down from the top sheet into the absorbent core and making it less likely for menstrual blood to cause initial surface flow, thereby making it less likely for menstrual blood to leak.

[0038] Even if the top sheet does not have an oily component-disposing region, when a wearer puts on the shorts-type napkin and body pressure is applied to the shorts-type napkin, part of the oily component will migrate to the top sheet, allowing menstrual blood to slide from the top sheet to the absorbent core. As described above, the above shorts-type napkin has excellent menstrual blood absorption properties and is less likely to leak menstrual blood.

[0039] [Aspect 14] The shorts-type napkin according to Aspect 13, wherein, in the unfolded state and viewed from above in the longitudinal direction, the oily component-disposing region is disposed inside the elastic member-disposing region.

[0040] In the above shorts-type napkin, in the unfolded state and in a plan view from the longitudinal direction, the oily component-distributed region is located inside the elastic member-distributed region. Therefore, even if menstrual blood causes an initial surface flow in the direction of the oily component-distributed region, the menstrual blood can migrate to the absorbent core via the top sheet in the region where no oily component is disposed that is located outside the oily component-distributed region in the width direction, making it less likely to leak.

[0041] [Aspect 15] The shorts-type napkin according to any one of Aspects 1 to 14, wherein in the ventral region, the outer casing comprises a multiple-sheet region composed of a plurality of sheets arranged toward the front end, and a single-sheet region composed of a single sheet arranged toward the rear end, and in the ventral region in the unfolded state, the oily component-disposed region overlaps with the single-sheet region in the thickness direction but does not overlap with the multiple-sheet region in the thickness direction.

[0042] In the above-mentioned shorts-type napkin, the oily ingredient-distributed region and the single-sheet region overlap in the thickness direction in the abdominal region when the napkin is unfolded. Therefore, in the single-sheet region, the oily ingredient slides menstrual blood down to the absorbent core, making it easier for the wearer to see the absorbent core stained red with menstrual blood from the non-skin side of the shorts-type napkin, giving the wearer a sense of security that the shorts-type napkin is absorbing menstrual blood. Furthermore, since the multiple-sheet region does not overlap with the oily ingredient-distributed region, menstrual blood is less likely to initially flow over the surface, thereby suppressing leakage.

[0043] [Aspect 16] The shorts-type napkin according to any one of Aspects 1 to 15, wherein in the back region, the outer casing comprises a single-sheet region consisting of a single sheet arranged toward the front end, and a multiple-sheet region consisting of a plurality of sheets arranged toward the rear end, and in the back region in the unfolded state, the oily component-disposed region overlaps with the single-sheet region and the multiple-sheet region in the thickness direction.

[0044] In the above-mentioned shorts-type napkin, in the back region in the unfolded state, the oily component region, the single-sheet region, and the multiple-sheet region overlap in the thickness direction, so that in both the single-sheet region and the multiple-sheet region, the oily component can slide menstrual blood down to the absorbent core, thereby preventing leakage.

[0045] [Aspect 17] The shorts-type napkin according to any one of Aspects 1 to 16, wherein in the unfolded state and in the area overlapping with the absorbent core in the thickness direction, the liquid-impermeable sheet or the outer casing has a colored portion in a range closer to the front end or the rear end than the oily component-disposed area.

[0046] Since the above-mentioned shorts-type napkin has a predetermined colored portion, the menstrual blood absorbed by the absorbent core can be hidden to a certain extent from the non-skin side of the shorts-type napkin in the areas near the front end and the rear end, making it less likely that the wearer will feel anxious about the possibility of menstrual blood leaking from the front or back of the shorts-type napkin.

[0047] [Aspect 18] The shorts-type napkin according to Aspect 17, wherein, in a plan view from the thickness direction in the unfolded state, the liquid-impermeable sheet and the outer casing do not have a colored portion in an area overlapping the oily component-disposed region.

[0048] Since the above-mentioned shorts-type napkin does not have a specified colored portion, it is easy for the wearer to visually recognize from the non-skin side of the shorts-type napkin that the absorbent core has absorbed menstrual blood, which makes it easier for the wearer to get the impression that the shorts-type napkin absorbs menstrual blood well and is less likely to leak.

[0049] The shorts-type napkin according to the present disclosure will be described in detail below. [First Embodiment] Figures 1 to 7 are diagrams illustrating a shorts-type napkin 1 according to one embodiment of the present disclosure (hereinafter referred to as the "first embodiment"). Specifically, Figure 1 is a perspective view of the shorts-type napkin 1. Figures 2 and 3 are views of the inner and outer sides, respectively, of the shorts-type napkin 1 in an unfolded state. Figures 4 and 5 are views of the inner and outer sides, respectively, of the absorbent main body 3 in an unfolded state. Figure 6 is an end view of the shorts-type napkin 1 taken along the line VI-VI in Figure 2. Note that the compressed portions 37 are omitted in Figure 6, and not all of the bonded portions are shown. Figure 7 is a partially enlarged end view of the shorts-type napkin 1 taken along the line VI-VI in Figure 2. Figure 8 is a partially enlarged end view of the shorts-type napkin 1 taken along the line VIII-VIII in Figure 2.

[0050] The shorts-type napkin 1 has a waist opening 101 and a pair of leg openings 103 (one leg opening 103a and the other leg opening 103b), and a pair of fastening parts 105 (one fastening part 105a and the other fastening part 105b) extending from the waist opening 101 toward the pair of leg openings 103. The pair of fastening parts 105 fasten the ventral region 7 and the dorsal region 9, which will be described later.

[0051] The shorts-type napkin 1 comprises an absorbent body 3 that absorbs menstrual blood and a shorts-shaped exterior body 5. The absorbent body 3 has a rectangular shape with a longitudinal direction L and a width direction W. The absorbent body 3 and the exterior body 5 are fixed to the exterior body 5 by an inter-body joint 131 made of hot melt adhesive.

[0052] In its unfolded state, the shorts-type napkin 1 has a longitudinal direction L and a width direction W that originate from the absorbent main body 3, and a thickness direction T that is perpendicular to the longitudinal direction L and the width direction W. Note that the longitudinal direction L and the width direction W refer to the long and short directions of the absorbent main body 3, respectively, and do not refer to the long and short directions of the shorts-type napkin 1 in its unfolded state.

[0053] In its unfolded state, the shorts-type napkin 1 is divided by a longitudinal centerline LC extending in the width direction W at the center of the longitudinal direction L of the shorts-type napkin 1 into a ventral region 7 located closer to a front end 11 than the longitudinal centerline LC and a dorsal region 9 located closer to a rear end 13 than the longitudinal centerline LC. The front end 11 and rear end refer to the edge on the ventral region 7 side and the edge on the dorsal region 9 side, which define the waist opening 101, respectively.

[0054] The exterior body 5 includes a first exterior sheet 111 extending from the ventral region 7 to the dorsal region 9 and arranged on the clothing side, a ventral-side second exterior sheet 113a extending into the ventral region 7 and arranged on the skin side, and a dorsal-side second exterior sheet 113b extending into the dorsal region 9 and arranged on the skin side. Each of the first exterior sheet 111, the ventral-side second exterior sheet 113a, and the dorsal-side second exterior sheet 113b is made of a hydrophobic nonwoven fabric sheet.

[0055] The ventral-side second outer sheet 113a is disposed on the skin side of the first outer sheet 111 in the thickness direction T, and is disposed in the longitudinal direction L from the front end 11 that defines the waist-opening 101 to just before the longitudinal center line LC. In addition, the ventral-side second outer sheet 113a is disposed in the width direction W from one locking portion 105a to the other locking portion 105b.

[0056] The back-side second outer sheet 113b is disposed on the skin side of the first outer sheet 111 in the thickness direction T, and is disposed in the longitudinal direction L from the rear end 13 that defines the waist-opening 101 to just before the longitudinal center line LC. In addition, the back-side second outer sheet 113b is disposed in the width direction W from one locking portion 105a to the other locking portion 105b.

[0057] The first outer sheet 111 is folded inward at the front end 11 and the rear end 13, respectively, to cover the ventral-side second outer sheet 113a and the dorsal-side second outer sheet 113b. In the unfolded state, the outer body 5 is partitioned into a single-sheet region 51 consisting of a single sheet (i.e., the first outer sheet 111) and a multiple-sheet region 53 consisting of multiple sheets (i.e., the first outer sheet 111 and the ventral-side second outer sheet 113a or the dorsal-side second outer sheet 113b). The single-sheet region 51 is arranged from the ventral region 7 to the dorsal region 9, straddling the longitudinal centerline LC. The multiple-sheet region 53 is arranged in each of the ventral region 7 and the dorsal region 9.

[0058] In the unfolded state, in the multiple-sheet region 53 of the abdominal region 7, a plurality of abdominal-side elastic members 115 are arranged between the first outer sheet 111 and the abdominal-side second outer sheet 113a, extending from one engaging portion 105a to the other engaging portion 105b and spaced apart in the longitudinal direction L. The plurality of abdominal-side elastic members 115 are joined to the first outer sheet 111 and the abdominal-side second outer sheet 113a by an inter-outer-sheet adhesive layer (not shown) made of a hot melt adhesive in a state in which they are stretched relative to the first outer sheet 111 and the abdominal-side second outer sheet 113a.

[0059] In the unfolded state, in the multiple-sheet region 53 of the back region 9, a plurality of back-side elastic members 117 are arranged between the first outer sheet 111 and the back-side second outer sheet 113b, extending from one locking portion 105a to the other locking portion 105b or from one leg opening 103a to the other leg opening 103b, and spaced apart in the longitudinal direction L. In addition, in the unfolded state, the multiple-sheet region 53 of the back region 9 is provided with three rear leg elastic members 119 arranged between the first outer sheet 111 and the back-side second outer sheet 113b, extending from one locking portion 105a through one leg opening 103a and the other leg opening 103b to the other locking portion 105b, overlapping with the absorbent main body 3 and curved to protrude toward the longitudinal center line LC.

[0060] The multiple back elastic members 117 and the three rear leg elastic members 119 are joined to the first outer sheet 111 and the ventral second outer sheet 113a by inner outer sheet joints 133 made of hot melt adhesive while being stretched relative to the first outer sheet 111 and the back second outer sheet 113b.

[0061] The absorbent body 3 comprises, in the thickness direction T, a top sheet 21 having a skin-contacting surface 23a and a non-skin-contacting surface 23b, a second sheet 25, an absorbent core 27a, a liquid-impermeable sheet 29, an elastic member 31, and a hydrophobic nonwoven fabric sheet 35, in that order. The absorbent core 27a is arranged together with a core wrap 27b that covers the absorbent core 27a as an absorber 27. The absorbent core 27a is hourglass-shaped and has a pair of constricted portions 27c that are constricted in the width direction W.

[0062] The absorbent body 3 has a compression section 37 that compresses the top sheet 21, the second sheet 25, and the absorbent body 27 (absorbent core 27a and core wrap 27b), and the compression section 37 has a rabbit design. The core wrap 27b, which is disposed between the absorbent core 27a and the liquid-impermeable sheet 29, is joined to the absorbent core 27a by an adhesive layer (not shown) made of hot-melt adhesive. In addition, the core wrap 27b, which is disposed between the absorbent core 27a and the liquid-impermeable sheet 29, is joined to the liquid-impermeable sheet 29 by a core wrap joining section 135 made of hot-melt adhesive.

[0063] The absorbent core 27a has a peaked portion 39 extending in the longitudinal direction L at the center in the width direction W. The peaked portion 39 is taller and has a larger basis weight than the remaining portions of the absorbent core 27a. This makes it easier for the peaked portion 39 of the absorbent core 27a to abut against the wearer's excretory opening, intergluteal cleft, etc. The core wrap 27b is folded inward in three along two fold lines extending parallel to the longitudinal direction L to cover the absorbent core 27a. At the skin side of the absorbent core 27a and at the center in the width direction W, the core wrap 27b overlaps two layers in the thickness direction T and has a multi-layer overlap region 55 extending in the longitudinal direction L.

[0064] The top sheet 21 is arranged to cover the second sheet 25 and absorber 27 (absorbent core 27a and core wrap 27b), and is joined to the liquid-impermeable sheet 29 with a hot melt adhesive. The liquid-impermeable sheet 29 is made of a moisture-permeable film with apertures. The liquid-impermeable sheet 29 stands up together with the leakage prevention walls 43 described below, protecting the sides of the liquid-impermeable sheet 29. The hydrophobic nonwoven fabric sheet 35 is made of a hydrophobic nonwoven fabric.

[0065] The elastic member 31 is composed of five thread-like elastic members, and the five thread-like elastic members define an elastic member distribution region 33. The five thread-like elastic members are arranged along the longitudinal direction L, extending from the multiple-sheet region 53 in the ventral region 7, through the single-sheet region 51 in the ventral region 7 and the single-sheet region 51 in the dorsal region 9, and to the multiple-sheet region 53 in the dorsal region 9. The five thread-like elastic members constituting the elastic member 31 are arranged at regular intervals in the width direction W. The elastic member 31 is joined to the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35 by inter-film nonwoven fabric joints 137 made of a hot melt adhesive, with the five thread-like elastic members stretched relative to the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35. The elastic member 31 is a member that facilitates contact of the absorbent main body 3, and therefore the absorbent core 27a, with the wearer's excretory opening.

[0066] In Figure 6, the elastic member 31 is shown as being arranged on the liquid-impermeable sheet 29 side, and the film-to-nonwoven fabric joint 137 is shown as being arranged on the hydrophobic nonwoven fabric sheet 35 side, but in reality, the film-to-nonwoven fabric joint 137 bonds the elastic member 31 from the liquid-impermeable sheet 29 side and the hydrophobic nonwoven fabric sheet 35 side.

[0067] The absorbent core 27a is partitioned into a widthwise central region 63 located in the center of the width direction W of the absorbent core 27a, and a pair of widthwise side regions 65 located on both sides of the widthwise central region 63 in the width direction W. The five thread-like elastic members that make up the elastic member 31 are located in the widthwise central region 63. The oily component-locating region 41 is also located in the widthwise central region 63.

[0068] At each end of the width direction W of the hydrophobic nonwoven fabric sheet 35, the sheet is folded twice, once inward and once outward, along two fold lines extending parallel to the longitudinal direction L to form leakage barriers 43, and a pair of leakage barrier walls 43 is formed at each end of the width direction W of the hydrophobic nonwoven fabric sheet 35. Each of the pair of leakage barrier walls 43 includes two leakage barrier wall elastic members 45 that, in the unfolded state, extend in the longitudinal direction L from the multiple-sheet region 53 in the ventral region 7, through the single-sheet region 51 in the ventral region 7 and the dorsal region 9, to the multiple-sheet region 53 in the dorsal region 9. Each of the two leakage barrier wall elastic members 45 is joined to the leakage barrier wall 43 (hydrophobic nonwoven fabric sheet 35) with a hot melt adhesive while being stretched relative to the leakage barrier wall 43 (hydrophobic nonwoven fabric sheet 35). In each of the pair of leakage barrier walls 43, two leakage barrier elastic members 45 are joined to the leakage barrier wall 43 (hydrophobic nonwoven fabric sheet 35), and the region exhibiting stretchability is referred to as an elastic region 47. The pair of leakage barrier walls 43 are made of the hydrophobic nonwoven fabric that forms the hydrophobic nonwoven fabric sheet 35, and are hydrophobic, and when worn, stand up from the absorbent main body 3 to suppress leakage of menstrual blood.

[0069] The absorbent body 3 includes an oily component-disposing region 41 in which an oily component is disposed, which is disposed on the non-skin contacting surface 23b of the top sheet 21. The shorts-type napkin 1 includes a hydrophobic nonwoven fabric sheet 35 that is disposed within the oily component-disposing region 41 in a plan view in the unfolded state and that is disposed adjacent to the non-skin side of the liquid-impermeable sheet 29. This makes it possible to prevent menstrual blood, etc. from adhering to other articles even if the menstrual blood, etc., passes through the liquid-impermeable sheet 29 due to its menstrual blood permeability.

[0070] Furthermore, the film-nonwoven fabric joint 137 joining the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35 is formed over their entire surfaces, particularly within the oily component-disposing region 41 in a plan view in the unfolded state, by a plurality of hot-melt adhesives 137a that extend spirally in the longitudinal direction L and are arranged at regular intervals in the width direction W. Therefore, when the film-nonwoven fabric joint 137 is cut along any straight line parallel to the longitudinal direction L, the hot-melt adhesives 137a are arranged intermittently in the longitudinal direction L. Furthermore, when the film-nonwoven fabric joint 137 is cut along any straight line parallel to the width direction W, the hot-melt adhesives 137a are arranged intermittently in the width direction W. The presence of the film-nonwoven fabric joint 137 in the shorts-type napkin 1 can prevent the absorbent main body 3 from twisting, the liquid-impermeable sheet 29 from tearing, etc.

[0071] 7 and 8, gaps 151 are likely to be formed between the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35 in the portions where the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35 are not joined. As a result, due to the menstrual blood permeability, menstrual blood, etc. 155 that has passed through the fine openings 153 of the liquid-impermeable sheet 29 is less likely to reach the hydrophobic nonwoven fabric sheet 35 and is less likely to reach outside the hydrophobic nonwoven fabric sheet 35, which in turn makes it possible to prevent menstrual blood, etc. from adhering to other articles.

[0072] As shown in Figure 7, the hydrophobic nonwoven fabric sheet 35 is made of a hydrophobic SMS nonwoven fabric and includes, in order from the liquid-impermeable sheet 29 side, a first low-density layer 161, a high-density layer 163, and a second low-density layer 165. The high-density layer 163 has a density relatively higher than that of the first low-density layer 161 and the second low-density layer 165. Therefore, the first low-density layer 161 and the high-density layer 163 allow oily components that have permeated the liquid-impermeable sheet 29 due to their menstrual blood permeability to migrate from the first low-density layer 161 to the high-density layer 163, thereby preventing the oily components from reducing the bond strength of the film-nonwoven fabric bonded portion 137. Furthermore, the high-density layer 163 and the second low-density layer 165 allow menstrual blood that has permeated the liquid-impermeable sheet 29 due to their menstrual blood permeability to be retained by the high-density layer 163, making it less likely for the oily components to migrate to the second low-density layer 165.

[0073] In a plan view in the unfolded state, the shorts-type napkin 1 is provided with a ventral-side second outer sheet 113a, a first outer sheet 111, or a dorsal-side second outer sheet 113b as an additional hydrophobic nonwoven fabric sheet located in the oily component-disposing region 41 and adjacent to the non-skin side of the hydrophobic nonwoven fabric sheet 35. Specifically, in the multiple-sheet region 53 in the ventral region 7, the ventral-side second outer sheet 113a corresponds to the additional hydrophobic nonwoven fabric sheet. In the single-sheet region 51 in the ventral region 7 and the dorsal region 9, the first outer sheet 111 corresponds to the additional hydrophobic nonwoven fabric sheet. In the multiple-sheet region 53 in the dorsal region 9, the dorsal-side second outer sheet 113b corresponds to the additional hydrophobic nonwoven fabric sheet. As a result, menstrual blood and the like that has permeated the liquid-impermeable sheet 29 due to its menstrual blood permeability becomes less likely to reach the outside of the hydrophobic nonwoven fabric sheet 35 and the additional hydrophobic nonwoven fabric sheets, which correspond to the ventral second outer sheet 113a, the first outer sheet 111, and the dorsal second outer sheet 113b.

[0074] The inter-body joint 131 corresponds to the "inter-nonwoven fabric joint" that joins the "hydrophobic nonwoven fabric sheet 35" of the absorbent body 3, which corresponds to the "hydrophobic nonwoven fabric sheet," and the "ventral second outer sheet 113a, first outer sheet 111, or dorsal second outer sheet 113b" of the outer body 5, which corresponds to the "additional hydrophobic nonwoven fabric sheet."

[0075] The inter-body joint 131 is configured with a plurality of hot melt adhesives 131a that extend spirally in the longitudinal direction L and are spaced at regular intervals in the width direction W over their entire surfaces, particularly within the oily component distribution region 41 in a plan view in the unfolded state. Therefore, when the inter-body joint 131 is cut along any straight line parallel to the longitudinal direction L, the hot melt adhesives 131a are intermittently arranged in the longitudinal direction L. Furthermore, when the inter-body joint 131 is cut along any straight line parallel to the width direction W, the hot melt adhesives 131a are intermittently arranged in the width direction W. Furthermore, the film-nonwoven fabric joint 137 and the inter-body joint 131 corresponding to the "inter-nonwoven fabric joint" have non-overlapping joint portions (not shown) that do not overlap each other in the thickness direction T.

[0076] 7, in the multiple-sheet region 53, gaps 151 are likely to be formed between the hydrophobic nonwoven fabric sheet 35 and the back-side second outer sheet 113b in the portions where the hydrophobic nonwoven fabric sheet 35 and the back-side second outer sheet 113b are not joined. As a result, even if menstrual blood, etc. 155 that has permeated the fine openings 153 of the liquid-impermeable sheet 29 due to the menstrual blood permeability does permeate the hydrophobic nonwoven fabric sheet 35, it is less likely to reach the back-side second outer sheet 113b and less likely to reach areas outside the back-side second outer sheet 113b, thereby preventing menstrual blood, etc. from adhering to other articles.

[0077] 8, in the single-sheet region 51, in the portion where the hydrophobic nonwoven fabric sheet 35 and the first outer sheet 111 are not joined, a gap 151 is likely to be formed between the hydrophobic nonwoven fabric sheet 35 and the first outer sheet 111. As a result, even if menstrual blood, etc. 155 that has permeated the fine openings 153 of the liquid-impermeable sheet 29 due to the menstrual blood permeability passes through the hydrophobic nonwoven fabric sheet 35, it is difficult for it to reach the first outer sheet 111 and therefore difficult for it to reach areas outside the first outer sheet 111, thereby preventing menstrual blood, etc. from adhering to other articles.

[0078] Furthermore, in the dorsal region 9 where body pressure is likely to be applied when sleeping, etc., menstrual blood and the like that has permeated the liquid-impermeable sheet 29 due to its menstrual blood permeability is less likely to reach the outside than the hydrophobic nonwoven fabric sheet 35 and the first outer sheet 111 and dorsal-side second outer sheet 113b, which correspond to the additional hydrophobic nonwoven fabric sheets. Note that the ventral-side second outer sheet 113a and first outer sheet 111, which correspond to the additional hydrophobic nonwoven fabric sheets, also act in the same manner as the dorsal-side second outer sheet 113b.

[0079] In the unfolded state, the core wrap joint 135 that joins the core wrap 27b and the liquid-impermeable sheet 29 is configured with a plurality of hot melt adhesives 135a that extend spirally in the longitudinal direction L and are arranged at regular intervals in the width direction W over their entire surfaces, particularly within the oily component arrangement region 41 when viewed from above in the unfolded state. Therefore, when the core wrap joint 135 is cut along any straight line parallel to the longitudinal direction L, the hot melt adhesives 135a are arranged intermittently in the longitudinal direction L. Furthermore, when the core wrap joint 135 is cut along any straight line parallel to the width direction W, the hot melt adhesives 135a are arranged intermittently in the width direction W.

[0080] 7 and 8, gaps 151 are likely to be formed between the core wrap 27b and the liquid-impermeable sheet 29 in the portions where the core wrap 27b and the liquid-impermeable sheet 29 are not joined. As a result, it becomes difficult for oily components and menstrual blood to reach the liquid-impermeable sheet 29 from the core wrap 27b, making it difficult for menstrual blood to permeate.

[0081] The core wrap 27b is made of an oil-absorbent sheet, which allows oily components that reach the absorbent core 27a to be retained in the core wrap 27b, making it difficult for the oily components to pass through the liquid-impermeable sheet 29, and making it difficult for menstrual blood to pass through.

[0082] In the unfolded state, the oily component-distributing region 41 and the elastic member-distributing region 33 of the elastic member 31 overlap in the thickness direction T. Furthermore, in the unfolded state, of the five thread-like elastic members that make up the elastic member 31, the central three overlap with the oily component-distributing region 41 in the thickness direction T. This makes it easier to bring the absorbent core 27a into contact with the wearer's excretory opening, making it easier for menstrual blood to slide from the top sheet 21 to the absorbent core 27a, and also making it harder for menstrual blood to initially flow on the surface, thereby making it less likely for menstrual blood to leak.

[0083] In the unfolded state, the oily component-disposing region 41 and the elastic member-disposing region 33 reach a position closer to the rear end 13 than the rear leg elastic members 119 arranged on the outer casing 5. As a result, the oily component arranged up to a position closer to the rear end 13, together with the rear leg elastic members 119, suppresses the initial surface flow of menstrual blood, allowing the menstrual blood to slide down into the absorbent core 27a. Furthermore, the rear leg elastic members 119 prevent the elastic members 31 from causing the absorbent core 27a to penetrate too far into the wearer's gluteal cleft, ensuring the length of the absorbent core 27a in the width direction W, and suppressing leakage.

[0084] In the oily component-distributing region 41, the oily component is applied with a substantially uniform basis weight, and the area of ​​the oily component-distributing region in the ventral region 7 is larger than the area of ​​the oily component-distributing region in the dorsal region 9. Therefore, the total amount of oily component in the ventral region 7 is larger than the total amount of oily component in the dorsal region 9. As a result, in the ventral region 7, the oily component in the ventral region 7 makes it easier for menstrual blood excreted from the excretory opening to slide from the top sheet 21 to the absorbent core 27a. Furthermore, in the dorsal region 9, even if menstrual blood flows toward the buttocks due to initial surface flow, the initial surface flow can be suppressed in the region without oily component, allowing the menstrual blood to transfer to the absorbent core 27a and preventing leakage.

[0085] The length (no reference symbol) in the longitudinal direction L of the elastic member arrangement region 33 in the back region 9 is longer than the length (no reference symbol) in the longitudinal direction L of the elastic member arrangement region 33 in the ventral region 7. As a result, in the ventral region 7, the elastic members 31 are less likely to cause pain in the wearer's abdomen, and in the back region 9, the elastic members 31 make it easier for the absorbent core 27a to conform to the intergluteal cleft of the wearer's buttocks, thereby suppressing initial surface flow in the back region 9 and making leakage less likely to occur.

[0086] In a plan view from the width direction W in the unfolded state (i.e., when the absorbent main body 3 in Fig. 4 is observed from the left or right side), the oily component distribution region 41 is present within the elastic regions 47 of the pair of leakage preventing walls 43. As a result, even if an initial surface flow of menstrual blood occurs due to the oily component, the leakage preventing walls 43 that stand up when worn can prevent menstrual blood from leaking outside the shorts-type napkin 1.

[0087] In the unfolded state, the elastic member-arranging region 33 extends to a position closer to the rear end 13 than the oily component-arranging region 41, and the elastic member-arranging region 33 positioned closer to the rear end 13 than the oily component-arranging region 41 is referred to as the rear elastic member-arranging region 33a. The top sheet 21 does not contain an oily component in the rear elastic member-arranging region 33a. This makes it easier to fit the absorbent core 27a to the buttocks, particularly the intergluteal cleft, and reduces the initial surface flow of menstrual blood, particularly the initial surface flow to the rear.

[0088] In the unfolded state, the elastic member-arranging region 33 extends to a position closer to the front end 11 than the oily component-arranging region 41, and the elastic member-arranging region 33 positioned closer to the front end 11 than the oily component-arranging region 41 is referred to as the front elastic member-arranging region 33b. The top sheet 21 does not contain the oily component in the front elastic member-arranging region 33b. This makes it easier to fit the absorbent core 27a to the abdomen and reduces the initial surface flow of menstrual blood, particularly the surface flow toward the front.

[0089] In the unfolded state, the absorbent main body 3 is provided with an extension portion 61 at each of a pair of leg openings 103 (one leg opening 103a and the other leg opening 103b) that extends outward in the width direction W beyond the outer casing 5, thereby constituting a pair of extension portions 61. In a plan view from the width direction W in the unfolded state (i.e., when the shorts-type napkin 1 in FIG. 2 is observed from the left or right side), the oily component distribution region 41 and each of the pair of extension portions 61 overlap. Specifically, in a plan view from the width direction W in the unfolded state, each of the pair of extension portions 61 is present within the oily component distribution region 41. As a result, even if an initial surface flow of menstrual blood occurs in the width direction W, the pair of extension portions 61 can absorb the menstrual blood and prevent leakage of menstrual blood.

[0090] In the back region 9 in the unfolded state, the oily component-disposing region 41 overlaps with the single-sheet region 51 and the multiple-sheet region 53 in the thickness direction T. This allows the oily component to slide menstrual blood down to the absorbent core 27a in both the single-sheet region 51 and the multiple-sheet region 53, thereby suppressing leakage.

[0091] In the back region 9 in the unfolded state, the edge (not numbered) of the oily component-disposing region 41 near the rear end 13 is located closer to the front end 11 than the edges (not numbered) of the pair of fastening portions 105 near the front end 11. As a result, even if menstrual blood flows toward the buttocks due to initial surface flow, the initial surface flow can be suppressed in the region closer to the rear end 13 than the oily component-disposing region 41, and the menstrual blood can be transferred to the absorbent core 27a.

[0092] In the abdominal region 7 in the unfolded state, the oily component-distributing region 41 overlaps with the single-sheet region 51 in the thickness direction T, but does not overlap with the multiple-sheet region 53 in the thickness direction T. As a result, in the single-sheet region 51, the oily component causes menstrual blood to slide down to the absorbent core 27a, allowing the wearer to visually see the absorbent core 27a stained red by menstrual blood. Furthermore, because the multiple-sheet region 53 does not overlap with the oily component-distributing region 41, menstrual blood is less likely to initially flow over the surface, thereby suppressing leakage.

[0093] In the abdominal region 7 in the unfolded state, the edge (not numbered) of the oily component-disposing region 41 closer to the front end 11 is located closer to the rear end 13 than the edges (not numbered) of the pair of fastening portions 105 closer to the rear end 13. As a result, even if menstrual blood flows toward the abdominal side due to the initial surface flow, the initial surface flow can be suppressed in the region closer to the front end 11 than the oily component-disposing region 41, and the menstrual blood can be transferred to the absorbent core 27a.

[0094] In a plan view from the longitudinal direction L in the unfolded state (i.e., the perspective of Figure 6), the oily component-disposing region 41 is disposed beyond the central peak 39 of the absorbent core 27a. This allows menstrual blood that has not been absorbed by the central peak 39, menstrual blood that has initially flowed on the surface, and the like, to slide down to the absorbent core by the oily component disposed outside in the width direction W beyond the central peak 39. Furthermore, the core wrap 27b has a multi-layer overlap region 55 in the center in the width direction W, where multiple core wraps 27b are layered, and therefore the multi-layer overlap region 55 can be fitted to the wearer's excretory opening, intergluteal cleft, etc., to absorb menstrual blood.

[0095] In a plan view from the longitudinal direction L in the unfolded state (i.e., when the absorbent main body 3 in Fig. 4 is observed from above or below), the oily component-disposing region 41 is disposed within the range of the absorbent core 27a at the pair of constricted portions 27c. As a result, even if an initial surface flow of menstrual blood occurs at the pair of constricted portions 27c, the region of the pair of constricted portions 27c where no oily component is disposed allows the menstrual blood to slide down to the absorbent core.

[0096] In a plan view in the unfolded state, the oily component placement region 41 does not overlap with the leakage preventing wall elastic member 45 provided on each of the pair of leakage preventing walls 43. This prevents the oily component from coming into contact with the leakage preventing wall elastic member 45, weakening the bond between the sheets that make up the leakage preventing wall elastic member 45 and the leakage preventing wall 43, and reducing the elasticity of the leakage preventing wall elastic member 45.

[0097] In the unfolded state, the exterior body 5 is provided with a back elastic member 117 and a rear leg elastic member 119 in the back region 9 and in a region outside the oily component-disposing region 41 in the width direction W, which overlap the absorbent core 27a in the thickness direction T and extend in the direction along the width direction W. This allows the shorts-type napkin 1 to fit the wearer, particularly the buttocks.

[0098] In the unfolded state and in a plan view from the longitudinal direction L (i.e., when the absorbent main body 3 in Fig. 4 is observed from above or below), the oily component-disposing region 41 is disposed inside the elastic member-disposing region 33. As a result, even if menstrual blood causes an initial surface flow in the width direction W in the oily component-disposing region 41, the menstrual blood can migrate to the absorbent core 27a via the top sheet 21 in the region where no oily component is disposed that is disposed outside the oily component-disposing region 41 in the width direction.

[0099] The shorts-type napkin 1 according to the first embodiment does not contain a volatile cooling agent. This makes it difficult for oily ingredients to inhibit menstrual blood from sliding down into the absorbent core 27a, resulting in excellent menstrual blood absorption. Furthermore, the volatile cooling agent is prevented from irritating the area around the excretory opening, which is sensitive to menstrual stress.

[0100] The shorts-type napkin according to the present disclosure is not particularly limited as long as it comprises an absorbent main body and an outer body, and may also comprise components other than the absorbent main body and outer body. The shorts-type napkin generally comprises a waist opening and a pair of leg openings (one leg opening and the other leg opening). The shorts-type napkin may have a pair of fastening portions (one fastening portion and the other fastening portion) that fasten the ventral region and the dorsal region. The pair of fastening portions may be openable or closed, or may be non-openable by fusion or the like. The shorts-type napkin according to the present disclosure may, for example, have a waist opening made of a single member and not have a pair of fastening portions.

[0101] The absorbent main body has a longitudinal direction and a width direction, and the shorts-type napkin, in its unfolded state, has a longitudinal direction and a width direction of the absorbent main body and a thickness direction perpendicular to the longitudinal and width directions. Note that the longitudinal direction and width direction used in relation to shorts-type napkins refer to the longitudinal direction and width direction of the absorbent main body, and do not refer to the long and short directions of the shorts-type napkin. Furthermore, in this specification, when the longitudinal direction, width direction, and / or thickness direction are simply referred to, they refer to the longitudinal direction, width direction, and / or thickness direction defined in relation to the shorts-type napkin described above.

[0102] In this specification, the "unfolded state" of a shorts-type napkin means a state in which the boundary between the ventral region and the dorsal region of the shorts-type napkin, for example, the locking of a pair of locking parts, is released as necessary, and the shorts-type napkin is stretched to an extent that does not rupture the material (e.g., nonwoven fabric) that makes up the shorts-type napkin, and spread out on a flat surface. Also, in this specification, the unfolded state of a shorts-type napkin may sometimes be simply referred to as the "unfolded state."

[0103] In its unfolded state, the shorts-type napkin is divided into a ventral region located closer to the front end than the longitudinal center and a dorsal region located closer to the rear end than the longitudinal center. The front end and rear end refer to the edges of the ventral region and the dorsal region, respectively, which define the waist opening.

[0104] The absorbent body includes an absorbent core, a liquid-permeable skin-side sheet disposed on the skin side of the absorbent core, and a liquid-impermeable sheet disposed on the non-skin side of the absorbent core. The absorbent body generally includes a liquid-permeable sheet (hereinafter referred to as the "top sheet") having a skin-contacting surface, and may optionally further include a liquid-diffusion sheet (hereinafter referred to as the "second sheet") disposed between the top sheet and the absorbent core, a liquid-diffusion sheet (hereinafter referred to as the "third sheet") disposed between the absorbent core and the liquid-impermeable sheet, or a sheet (e.g., a nonwoven fabric sheet, e.g., a hydrophobic nonwoven fabric sheet) disposed on the non-skin side of the liquid-impermeable sheet. The absorbent core may or may not have a pair of narrowed portions constricted in the width direction. The absorbent core may be disposed in the absorbent body as an absorber together with a core wrap covering the absorbent core.

[0105] The absorbent core can be divided into a widthwise central region located at the center of the absorbent core width and a pair of widthwise side regions located on both widthwise outer sides of the widthwise central region. The widthwise central region refers to the central 70% of the region in the width direction excluding the pair of constricted portions, and each of the pair of widthwise side regions refers to the outer 15% of the region in the width direction of the widthwise central region.

[0106] The absorbent main body has an oily component-disposing region in which an oily component is disposed in a liquid-permeable skin-side sheet and / or absorbent core. Examples of the skin-side sheet include a top sheet, a second sheet, and a core wrap disposed on the skin side of the absorbent core. From the viewpoint of allowing the oily component to act quickly on menstrual blood that has reached the absorbent main body, the oily component-disposing region is preferably disposed on the skin-contacting surface, interior, or non-skin-contacting surface of the top sheet, more preferably on the skin-contacting surface or interior, and even more preferably on the skin-contacting surface. From the viewpoint of preventing oily component contamination of a shorts-type napkin production line and oily component contamination of other shorts-type napkins, the oily component-disposing region is preferably disposed on the interior or non-skin-contacting surface of the top sheet, the second sheet, or the core wrap, more preferably on the non-skin-contacting surface of the top sheet, the second sheet, or the core wrap.

[0107] In the oily component distribution region, the oily component is preferably 0.01 g / m from the viewpoint of its action. 2 More preferably, 0.1 g / m 2 More preferably, 0.5 g / m 2 In addition, in the oily component placement region, the oily component is preferably placed at a basis weight of 20 g / m or more from the viewpoint of its action. 2 or less, more preferably 10 g / m 2 less than, and more preferably 5 g / m 2 Arranged at the following basis weights:

[0108] The liquid-impermeable sheet is made of a moisture-permeable film. The liquid-impermeable sheet preferably has a moisture content of 1500 g / m 2 24 hours or more, and more preferably 3000 g / m 2 The liquid-impermeable sheet preferably has a moisture permeability of 7200 g / m 2 24 hours or less, and more preferably 6500 g / m 2 - Moisture permeability of 24 hours or less. This is from the viewpoint of suppressing stuffiness. In the present disclosure, the moisture permeability can be measured in accordance with JIS Z0208-1976 "Test method for moisture permeability of moisture-proof packaging materials (cup method)." The temperature and humidity conditions for the test are a temperature of 40±0.5°C and a relative humidity of 60±2%.

[0109] From the viewpoint of liquid impermeability, the moisture-permeable film preferably satisfies the following requirements: (1) A film sample is left standing in a thermostatic chamber at 25°C ± 5°C for 24 hours. (2) 1 mL of saline is dropped onto one side of the sample using a dropper from a position 3 cm high to form a water droplet on the film. (3) After dropping the saline, it is confirmed whether the water droplet has permeated from one side to the other within 5 minutes. (4) Steps (1) to (3) are repeated three times, changing the position. (5) If the saline does not permeate the film in all three times, the film is deemed to be liquid impermeable.

[0110] The moisture-permeable film may have pores that can be visually confirmed (for example, pores larger than 20 μm), or may have minute pores that are difficult to visually confirm (for example, pores of 20 μm or less).

[0111] The shorts-type napkin according to the present disclosure includes a hydrophobic nonwoven fabric sheet that is located within the oily component-disposing region and on the non-skin side of the liquid-impermeable sheet when viewed in a plan view in an unfolded state. This allows the menstrual blood permeability to prevent menstrual blood from adhering to other articles, even if the menstrual blood passes through the liquid-impermeable sheet. Examples of such other articles include areas that may come into contact with the wearer's buttocks, such as the wearer's clothing, bed components (e.g., sheets), carpets, etc.

[0112] The hydrophobic nonwoven fabric sheet may be disposed adjacent to the non-skin side of the liquid-impermeable sheet, and may be disposed on the non-skin side of the liquid-impermeable sheet with other materials sandwiched therebetween, but is preferably disposed adjacent to the non-skin side of the liquid-impermeable sheet, which directly prevents menstrual blood from migrating outward from the hydrophobic nonwoven fabric sheet without diffusing menstrual blood that has permeated the liquid-permeable sheet onto other sheets, etc., thereby preventing menstrual blood from adhering to other articles.

[0113] The shorts-type napkin according to the present disclosure may include an additional hydrophobic nonwoven sheet that is present in the oily component-disposing region and is disposed adjacent to the non-skin side of the hydrophobic nonwoven sheet in a plan view in the unfolded state, thereby making it more difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability, to reach areas outside the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet, thereby preventing menstrual blood, etc. from adhering to other articles.

[0114] The above-mentioned hydrophobic nonwoven fabric sheet and any optional additional hydrophobic nonwoven fabric sheet may be provided in the absorbent body and may be sheets provided in the outer sheet, for example, a first outer sheet arranged on the non-skin side, a ventral second outer sheet extending in the ventral region and arranged on the skin side, a dorsal second outer sheet extending in the dorsal region and arranged on the skin side, etc.

[0115] As used herein, the hydrophobic nonwoven sheet and optional additional hydrophobic nonwoven sheet have hydrophobic properties and are made of, for example, hydrophobic fibers. Examples of the hydrophobic fibers include synthetic fibers. The synthetic fibers include those containing a single component, such as a single fiber, and those containing multiple components, such as a composite fiber. The synthetic fibers may also be biomass plastics, recycled fibers, etc.

[0116] Examples of the above components include polyolefin-based polymers such as polyethylene and polypropylene; polyester-based polymers such as terephthalate-based polymers such as polyethylene terephthalate (PET), polybutylene terephthalate, and polypentylene terephthalate; polyamide-based polymers such as nylon 6 and nylon 6,6; acrylic-based polymers; polyacrylonitrile-based polymers; and modified products thereof.

[0117] The hydrophobic fibers may include water-repellent cellulosic fibers that have been treated with a water-repellent agent to impart water repellency. Examples of the cellulosic fibers include natural cellulosic fibers, regenerated cellulosic fibers, refined cellulosic fibers, and semi-synthetic cellulosic fibers. Examples of the natural cellulosic fibers include plant fibers such as pulp fibers, seed hair fibers (e.g., cotton fibers), bast fibers (e.g., hemp), vein fibers (e.g., Manila hemp), and fruit fibers (e.g., palm).

[0118] The pulp fibers include those known in the art as pulp fibers, such as wood pulp fibers and non-wood pulp fibers. Examples of the wood pulp fibers include softwood pulp fibers and hardwood pulp fibers. Examples of the non-wood pulp fibers include straw pulp fibers, bagasse pulp fibers, reed pulp fibers, kenaf pulp fibers, mulberry pulp fibers, bamboo pulp fibers, hemp pulp fibers, and cotton pulp fibers (e.g., cotton linter fibers). The pulp fibers may be waste paper, recycled pulp fibers, etc.

[0119] The cotton fiber includes Hirsutum cotton fiber (e.g., upland cotton), Barbadense cotton fiber, Arboreum cotton fiber, and Helbaceum cotton fiber. The cotton fiber may also be organic cotton fiber or Pre-Organic Cotton (trademark) fiber. Organic cotton fiber refers to cotton certified by GOTS (Global Organic Textile Standard).

[0120] Examples of the regenerated cellulose fibers include rayon, for example, viscose rayon obtained from viscose, polynosic and modal, and cuprammonium rayon (also called "cupra") obtained from a cuprammonium salt solution of cellulose.

[0121] The purified cellulose fiber includes lyocell, specifically, a fiber obtained by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope (dope) and extruding the dope into a dilute solution of N-methylmorpholine N-oxide. The purified cellulose is commercially available, for example, under the trade name Tencel (trademark). The semi-synthetic fiber includes semi-synthetic cellulose, such as acetate fibers, e.g., triacetate and diacetate fibers.

[0122] In the oily component-disposed region in a plan view in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet may or may not be joined at a film-nonwoven fabric joint that joins the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet, but they are preferably joined at a film-nonwoven fabric joint, because the film-nonwoven fabric joint can prevent the absorbent body from twisting and the liquid-impermeable sheet from tearing.

[0123] When the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at the film-nonwoven fabric joint, the film-nonwoven fabric joint is preferably arranged intermittently in the longitudinal direction and / or width direction. This makes it easier for gaps to form between the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet in the areas where they are not joined, making it more difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability, to reach areas outside the hydrophobic nonwoven fabric sheet. The film-nonwoven fabric joint may also join other members, such as an elastic member, in addition to the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet.

[0124] When the shorts-type napkin according to the present disclosure is provided with the additional hydrophobic nonwoven fabric sheet, in the oily component placement area in a plan view in the unfolded state, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet may or may not be joined at an inter-nonwoven fabric joint that joins the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, but it is preferable that they are joined at the inter-nonwoven fabric joint.

[0125] When the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric are joined at the joints between the nonwoven fabrics, the joints between the nonwoven fabrics are preferably arranged intermittently in the longitudinal and / or width directions. This makes it easier for gaps to form between the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the areas where they are not joined, making it more difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability, to reach areas outside the additional hydrophobic nonwoven fabric sheet. Note that the joints between the nonwoven fabrics may also join other members, such as an elastic member, in addition to the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric.

[0126] In the shorts-type napkin according to the present disclosure, when the absorbent body further comprises a core wrap that covers the absorbent core from the liquid-impermeable sheet side, in the oily component placement area when viewed in a plan view in the unfolded state, the core wrap and the liquid-impermeable sheet may or may not be joined at a core wrap joint that joins the core wrap and the liquid-impermeable sheet, but it is preferable that they are joined at the core wrap joint.

[0127] When the core wrap and the liquid-impermeable sheet are joined at the core wrap joint, it is preferable that the core wrap joint be arranged intermittently in the longitudinal direction and / or width direction. This makes it easier for gaps to form between the core wrap and the liquid-impermeable sheet in the areas where they are not joined, making it more difficult for oily components and menstrual blood to reach the liquid-impermeable sheet from the core wrap, and making it less likely for menstrual blood to become permeable. Note that the core wrap joint may also join other members, such as an elastic member, in addition to the core wrap and the liquid-impermeable sheet.

[0128] In this specification, the joints (hereinafter sometimes simply referred to as "joints") including the film-nonwoven fabric joints, the optional nonwoven fabric joints, the optional core wrap joints, etc. may be those commonly used as joints in the technical field, such as adhesives, such as hot melt adhesives, and fused thermoplastic resins (when at least one of the two or more components to be joined contains a thermoplastic resin).

[0129] In order to arrange the joints intermittently in the longitudinal and / or width directions, the joints may be formed, for example, in a line or dot shape extending in a predetermined direction (e.g., the longitudinal or width direction) and spaced apart in a direction perpendicular to the predetermined direction. Examples of the line-shaped joints include spiral and Ω-shaped joints.

[0130] The hydrophobic nonwoven fabric sheet and / or the additional hydrophobic nonwoven fabric sheet may comprise a high-density layer disposed inward and a low-density layer disposed adjacent to the high-density layer on the non-skin side, the low-density layer having a lower density than the high-density layer, whereby menstrual blood that has permeated the liquid-impermeable sheet due to its menstrual blood permeability is retained by the high-density layer, making it less likely to transfer to the low-density layer disposed adjacent to the outside.

[0131] Examples of nonwoven fabrics having a high-density layer and a low-density layer include SMS nonwoven fabrics (spunbond / meltblown / spunbond nonwoven fabrics), air-through nonwoven fabrics (e.g., air-through nonwoven fabrics having a bore surface and an air surface), and laminates of nonwoven fabrics having a high-density layer and a low-density layer (e.g., laminates of spunbond nonwoven fabrics, laminates of spunlace nonwoven fabrics, etc.).

[0132] Furthermore, the hydrophobic nonwoven fabric sheet and / or the additional hydrophobic nonwoven fabric sheet may comprise a high-density layer, a low-density layer adjacent to the high-density layer and positioned on the non-skin side, the low-density layer having a lower density than the high-density layer, and a low-density layer adjacent to the high-density layer and positioned on the skin side, the low-density layer having a lower density than the high-density layer. This allows oily components that have permeated the liquid-impermeable sheet due to menstrual blood permeability to migrate from the low-density layer to the high-density layer, and prevents the oily components from reducing the bond strength of joints (e.g., joints between film and nonwoven fabrics or joints between nonwoven fabrics). An example of a hydrophobic nonwoven fabric sheet comprising a low-density layer, a high-density layer, and a low-density layer is an SMS nonwoven fabric.

[0133] The hydrophobic nonwoven fabric sheet may have a plurality of embossed portions. In this case, it is preferable that at least some, and more preferably all, of the plurality of embossed portions are recessed inward. This allows menstrual blood that has permeated the liquid-impermeable sheet due to menstrual blood permeability to be retained in the embossed portions, making it difficult for the menstrual blood retained in the embossed portions to reach outside the nonwoven fabric sheet. Examples of hydrophobic nonwoven fabrics having a plurality of embossed portions include spunbond nonwoven fabrics, SMS nonwoven fabrics, point-bond nonwoven fabrics, and meltblown nonwoven fabrics.

[0134] The film-nonwoven fabric joint and the nonwoven fabric joint may or may not have a non-overlapping portion where they do not overlap each other in the thickness direction, but it is preferable that they have such a non-overlapping portion. By having such a non-overlapping portion, menstrual blood or the like that has permeated the liquid-impermeable sheet due to its menstrual blood permeability is less likely to reach the outside of the additional hydrophobic nonwoven fabric sheet.

[0135] When the shorts-type napkin according to the present disclosure includes an additional hydrophobic nonwoven fabric sheet, the shorts-type napkin preferably includes the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in any one of the back regions when viewed in a plan view in the unfolded state, and more preferably includes the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back region and the oily component-arrangement region when viewed in a plan view in the unfolded state. This makes it more difficult for menstrual blood, etc. that has permeated the liquid-impermeable sheet due to its menstrual blood permeability to reach areas outside the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back region, which is prone to body pressure during sleep, etc.

[0136] The shorts-type napkin according to the present disclosure may further comprise an oil-absorbing or oil-retaining sheet between the absorbent core and the liquid-impermeable sheet, thereby enabling oily components that reach the absorbent core to be retained by the sheet, making it difficult for the oily components to pass through the liquid-impermeable sheet and reducing the risk of menstrual blood permeation.

[0137] Examples of the oil-absorbing or oil-retaining sheet include the core wrap and the third sheet. Examples of the oil-absorbing sheet include those containing the above-mentioned cellulosic fibers (including water-repellent cellulosic fibers), such as nonwoven fabrics. Examples of the oil-retaining sheet include those containing the above-mentioned hydrophobic fibers (excluding water-repellent cellulosic fibers), such as nonwoven fabrics.

[0138] The shorts-type napkin according to the present disclosure may include elastic members disposed on the non-skin side of the absorbent core and extending longitudinally from the ventral region to the dorsal region. The region defined by the elastic members is referred to as the "elastic member-disposing region." The elastic members may be composed of one or more linear elastic members (e.g., thread-like elastic members) or planar elastic members (e.g., stretchable nonwoven fabrics).

[0139] In this specification, "inner" and "outer" mean the direction toward the wearer's skin side and the direction away from the wearer's skin side, respectively, when viewed from the object, and in the unfolded state of the shorts-type napkin, the inner and outer sides coincide with the thickness direction. In this specification, "skin side" and "away from the skin side" mean the direction toward the wearer's skin side and the side away from the wearer's skin side, respectively, when viewed from the object. In this specification, "inner" and "outer" mean "inner side in the width direction" and "outer side in the width direction," respectively, unless otherwise specified.

[0140] When the elastic member is composed of a plurality of linear elastic members, the linear elastic members may have the same or different lengths in the longitudinal direction, and may be arranged at the same pitch in the width direction or at different pitches in the width direction.

[0141] When the shorts-type napkin according to the present disclosure is provided with the elastic member, the elastic member is located in the widthwise central region in a plan view in the unfolded state. The position of the elastic member in the thickness direction is not particularly limited as long as it is located on the non-skin side of the absorbent core, and examples thereof include between the absorbent core and the core wrap, between the core wrap and the liquid-impermeable sheet, between the liquid-impermeable sheet and a sheet constituting the absorbent main body arranged on the non-skin side thereof (e.g., a nonwoven fabric sheet, e.g., a hydrophobic nonwoven fabric sheet), between the absorbent main body and the outer sheet, and between two sheets constituting the outer sheet (e.g., a nonwoven fabric sheet, e.g., a hydrophobic nonwoven fabric sheet).

[0142] From the viewpoint of facilitating contact of the absorbent main body, and therefore the absorbent core, with the excretory opening of the wearer, the elastic member can be joined to the adjacent sheet in the thickness direction at a stretching ratio of preferably 1.1 or more, more preferably 1.5 or more, and even more preferably 2.0 or more relative to the adjacent sheet in the thickness direction. Also, from the above viewpoint, the elastic member can be joined to the adjacent sheet in the thickness direction at a stretching ratio of preferably 3.5 or less, more preferably 3.2 or less, and even more preferably 3.0 or less relative to the adjacent sheet in the thickness direction.

[0143] When the shorts-type napkin according to the present disclosure is equipped with the elastic member, it is preferable that the oily component-disposing region and the elastic member-disposing region overlap in the thickness direction in the unfolded state, which makes it easier for the elastic member to bring the absorbent main body, and in turn the absorbent core, into contact with the wearer's excretory opening, making it easier for menstrual blood to slide from the top sheet to the absorbent core and less likely for menstrual blood to initially flow over the surface, thereby reducing the likelihood of menstrual blood leakage.

[0144] In the shorts-type napkin according to the present disclosure, the total amount of oily components in the ventral region is preferably greater than the total amount of oily components in the dorsal region, more preferably by at least 1.1 times, and even more preferably by at least 1.3 times. Furthermore, the total amount of oily components in the ventral region is preferably greater than the total amount of oily components in the dorsal region by at most 3.0 times, and more preferably at most 2.0 times. As a result, in the ventral region, the oily components in the ventral region facilitate the menstrual blood excreted from the excretory opening to slide from the top sheet to the absorbent core, and in the dorsal region, even if menstrual blood flows toward the buttocks due to initial surface flow, the region free of oily components can suppress the initial surface flow, allowing the menstrual blood to be transferred to the absorbent core and preventing leakage.

[0145] In the shorts-type napkin according to the present disclosure, the longitudinal length of the elastic member-arrangement region in the back region is preferably longer than the longitudinal length of the elastic member-arrangement region in the ventral region, more preferably at least 1.1 times, even more preferably at least 1.5 times, and even more preferably at least 1.9 times. Furthermore, the longitudinal length of the elastic member-arrangement region in the back region is preferably no more than 5.0 times, more preferably no more than 4.0 times, and even more preferably no more than 3.0 times, compared to the longitudinal length of the elastic member-arrangement region in the ventral region. This reduces the risk of pain in the wearer's abdomen in the ventral region, and allows the elastic members in the back region to more easily conform to the intergluteal cleft of the wearer's buttocks, thereby suppressing initial surface flow in the back region and reducing leakage.

[0146] The shorts-type napkin according to the present disclosure may optionally include a pair of leakage barrier walls. Each of the pair of leakage barrier walls may have an elastic region extending in the longitudinal direction, or may not have an elastic region. If the pair of leakage barrier walls have an elastic region, they will stand up from the absorbent main body when worn, thereby suppressing leakage of menstrual blood. If the pair of leakage barrier walls have no elastic region, the absorbent main body, particularly the absorbent core, will be less likely to separate from the wearer's excretory opening, and the above-mentioned elastic member will more easily bring the absorbent core into contact with the excretory opening.

[0147] When the shorts-type napkin according to the present disclosure includes the pair of leakage barrier walls and the elastic region, the elastic region can be formed, for example, by a leakage barrier wall elastic member. Examples of the leakage barrier wall elastic member include the thread-like elastic member and planar elastic member described above. The elastic region can be formed by fixing the leakage barrier wall elastic member to the member constituting the leakage barrier wall with a hot melt adhesive or the like while the leakage barrier wall elastic member is stretched relative to the member constituting the leakage barrier wall.

[0148] When the shorts-type napkin according to the present disclosure has a pair of leak-barrier walls, in a plan view in the width direction in the unfolded state, the oily component-distributing region may or may not be present within the elastic region, but it is preferably present within the elastic region of one of the pair of leak-barrier walls, and more preferably within the elastic regions of both of the pair of leak-barrier walls, so that even if an initial surface flow of menstrual blood occurs due to the oily component, the leak-barrier walls that stand up when worn can prevent menstrual blood from leaking out of the shorts-type napkin.

[0149] When the shorts-type napkin according to the present disclosure has a pair of leak barrier walls, the oily component-disposing region may or may not overlap the leak barrier elastic member in a plan view in the unfolded state, but preferably does not overlap, thereby preventing the oily component from coming into contact with the leak barrier elastic member and weakening the bond between the leak barrier elastic member and the sheets that make up the leak barrier, thereby preventing the elasticity of the leak barrier elastic member from weakening.

[0150] In the shorts-type napkin according to the present disclosure, in a plan view in the unfolded state, the absorbent main body may or may not have extension portions that extend outward from the outer body at each of a pair of leg openings (one leg opening and the other leg opening). If the shorts-type napkin according to the present disclosure has the extension portions, it is preferable that the oily component distribution region and the extension portions overlap in a plan view in the width direction in the unfolded state. This allows the extension portions to absorb menstrual blood and prevent leakage, even if an initial surface flow of menstrual blood occurs in the width direction in the oily component distribution region.

[0151] In the shorts-type napkin according to the present disclosure, in the unfolded state, the elastic member-arrangement region may extend to a position closer to the rear end than the oily component-arrangement region, and the napkin may have the rear elastic member-arrangement region described above, or it may not extend to a position closer to the rear end, and may not have the rear elastic member-arrangement region described above. When the shorts-type napkin according to the present disclosure has the rear elastic member-arrangement region, it is preferable that the skin-side sheet in the rear elastic member-arrangement region contains a smaller amount of oily component than the oily component-arrangement region. This makes it difficult for initial surface flow of menstrual blood to occur rearward. The amount is expressed in terms of the amount per unit area, for example, basis weight (g / m 2 ) Also, the "small amount" can be 0 (for example, 0 g / m 2 ) is included.

[0152] From the above viewpoint, the basis weight of the oily component in the rear elastic member arrangement region is preferably more than 0.0 times, more preferably 0.1 times or more, and even more preferably 0.2 times or more, relative to the basis weight of the oily component in the oily component arrangement region. Also, from the above viewpoint, the basis weight of the oily component in the rear elastic member arrangement region is preferably less than 1.0 times, preferably 0.9 times or less, and even more preferably 0.7 times or less, relative to the basis weight of the oily component in the oily component arrangement region.

[0153] In the shorts-type napkin according to the present disclosure, in the unfolded state, the elastic member-arrangement region may extend to a position closer to the front end than the oily component-arrangement region, and the napkin may have the front elastic member-arrangement region described above, or it may not extend to a position closer to the front end, and may not have the front elastic member-arrangement region described above. When the shorts-type napkin according to the present disclosure has the front elastic member-arrangement region, it is preferable that the skin-side sheet in the front elastic member-arrangement region contains a smaller amount of oily component than the oily component-arrangement region. This makes it difficult for an initial surface flow of menstrual blood to occur forward. The amount is expressed in terms of the amount per unit area, for example, basis weight (g / m 2 ) Also, the "small amount" can be 0 (for example, 0 g / m 2 ) is included.

[0154] From the above viewpoint, the basis weight of the oily component in the front elastic member arrangement region is preferably more than 0.0 times, more preferably 0.1 times or more, and even more preferably 0.2 times or more, relative to the basis weight of the oily component in the oily component arrangement region. Also, from the above viewpoint, the basis weight of the oily component in the rear elastic member arrangement region is preferably less than 1.0 times, preferably 0.9 times or less, and even more preferably 0.7 times or less, relative to the basis weight of the oily component in the oily component arrangement region.

[0155] When the shorts-type napkin according to the present disclosure is provided with the pair of fastening parts, in the back region in the unfolded state, the rearward edge of the oily component-distributing region may or may not be located closer to the front end than the frontward edges of the pair of fastening parts, but is preferably located closer to the front end. As a result, even if menstrual blood flows toward the buttocks due to initial surface flow, the initial surface flow can be suppressed in the region closer to the rear end than the oily component-distributing region, allowing the menstrual blood to be transferred to the absorbent core and preventing leakage.

[0156] When the shorts-type napkin according to the present disclosure is provided with the pair of fastening parts, in the abdominal region in the unfolded state, the front-side edge of the oily component-distributing region may or may not be located closer to the rear end than the rear-side edges of the pair of fastening parts, but is preferably located closer to the rear end. As a result, even if menstrual blood flows toward the abdominal side due to initial surface flow, the initial surface flow can be suppressed in the region closer to the front end than the oily component-distributing region, allowing the menstrual blood to be transferred to the absorbent core and preventing leakage.

[0157] In the shorts-type napkin according to the present disclosure, the absorbent core may or may not have a centered center portion located in the width direction. In the shorts-type napkin according to the present disclosure, when the absorbent core has the centered center portion, the oily component-disposing region is preferably disposed so as to overlap the centered center portion, and more preferably to extend beyond the centered center portion, in a plan view from the longitudinal direction when the shorts-type napkin is in an unfolded state. This allows the oily component disposed on the outside in the width direction beyond the centered center portion to slide down to the absorbent core any menstrual blood that has not been absorbed by the centered center portion or that has undergone initial surface flow.

[0158] For the same reason, in the shorts-type napkin according to the present disclosure, when the absorbent core has the mid-height portion, it is preferable that the oily component distribution region is positioned so as to overlap with the mid-height portion when viewed in a plan view from the width direction in the unfolded state, and it is more preferable that it is positioned beyond the mid-height portion.

[0159] From the above viewpoint, it is preferable that the above-mentioned central high portion is positioned at least in the excretory opening contact area, more preferably so as to extend longitudinally through the excretory opening contact area, and more preferably so as to extend longitudinally from the excretory opening contact area to cover the intergluteal cleft of the wearer's buttocks.

[0160] In the shorts-type napkin according to the present disclosure, when the absorbent core has a pair of constricted portions, the oily component-disposing region may or may not be located within the absorbent core at the pair of constricted portions in a plan view from the longitudinal direction in the unfolded state, but is preferably located therein, so that even if an initial surface flow of menstrual blood occurs at the pair of constricted portions, the oily component-free region present in the pair of constricted portions can allow the menstrual blood to slide down into the absorbent core.

[0161] In the shorts-type napkin according to the present disclosure, when the absorbent main body further includes the core wrap, the core wrap may or may not include a multi-layer region in the widthwise center where multiple core wraps are stacked, but it is preferable that the multi-layer overlap region be included, so that the multi-layer overlap region can fit around the wearer's excretory opening, intergluteal cleft, etc., and absorb menstrual blood.

[0162] In the shorts-type napkin according to the present disclosure, the outer body may have a single-sheet region made up of a single sheet, or may have a multiple-sheet region made up of a plurality of sheets.

[0163] In the abdominal region of the shorts-type napkin according to the present disclosure, the outer casing may include a multiple-sheet region consisting of multiple sheets arranged near the front end and a single-sheet region consisting of a single sheet arranged near the rear end. In this case, in the abdominal region in the unfolded state, it is preferable that the oily component-disposed region overlaps the single-sheet region in the thickness direction but does not overlap the multiple-sheet region in the thickness direction. This allows the oily component in the single-sheet region to slide menstrual blood onto the absorbent core, allowing the wearer to visually observe the absorbent core stained red by menstrual blood, giving the wearer a sense of security that the shorts-type napkin is absorbing menstrual blood. Furthermore, because the multiple-sheet region does not overlap with the oily component-disposed region, menstrual blood is less likely to initially flow over the surface, thereby suppressing leakage.

[0164] In the back region of the shorts-type napkin according to the present disclosure, the outer casing may include a single-sheet region consisting of a single sheet disposed near the front end and a multiple-sheet region consisting of multiple sheets disposed near the rear end. In this case, in the back region in the unfolded state, it is preferable that the oily component region overlaps the single-sheet region and the multiple-sheet region in the thickness direction. This allows the oily component to slide menstrual blood down to the absorbent core in both the single-sheet region and the multiple-sheet region, thereby preventing leakage.

[0165] The outer body may include an elastic member for fitting the shorts-type napkin according to the present disclosure to a wearer. The outer body may include, for example, an abdominal-side elastic member extending from one fastening portion to the other fastening portion in the abdominal region. The abdominal-side elastic member may be a plurality of linear abdominal-side elastic members spaced apart in the longitudinal direction, or may be a planar abdominal-side elastic member.

[0166] The outer cover may include, for example, rear elastic members extending in the width direction in the rear region (e.g., extending from one fastening portion to the other fastening portion and / or extending from one leg opening to the other leg opening). The rear elastic members may be a plurality of linear rear elastic members spaced apart in the longitudinal direction, or may be planar rear elastic members.

[0167] The back elastic member preferably overlaps the absorbent core in the thickness direction in an area outside the oily component-disposing area in the width direction, and is more preferably bonded directly or indirectly to the absorbent main body using a hot melt adhesive, etc. This allows the absorbent core to fit the wearer's skin in the oily component-disposing area, and ensures the width of the absorbent core in the area outside the oily component-disposing area in the width direction.

[0168] The outer cover may also include rear leg elastic members in the back region, each extending widthwise (e.g., from one fastening portion, along one leg opening, the absorbent main body, and the other leg opening, to the other fastening portion). The rear leg elastic members may be curved so as to protrude toward the longitudinal centerline. The rear leg elastic members may be partially or entirely broken in a region that overlaps with the absorbent core when the shorts-type napkin is unfolded.

[0169] In the shorts-type napkin according to the present disclosure, when the outer casing includes the rear leg elastic members, in the unfolded state, the oily component-disposing region and / or the elastic component-disposing region can extend beyond the rear leg elastic members and reach a position closer to the rear end than the rear leg elastic members. Thus, when the oily component-disposing region extends to a position closer to the rear end than the rear leg elastic members, the oily component disposed up to the rear end, together with the rear leg elastic members, can suppress the initial surface flow of menstrual blood and allow menstrual blood to slide down to the absorbent core. Furthermore, when the elastic component-disposing region extends to a position closer to the rear end than the rear leg elastic members, the rear leg elastic members can prevent the elastic members from pushing the absorbent core too far into the wearer's gluteal cleft, thereby ensuring the width of the absorbent core and preventing leakage.

[0170] In the shorts-type napkin according to the present disclosure, in the unfolded state and in the area overlapping with the absorbent core in the thickness direction, the liquid-impermeable sheet and / or the outer body can have a colored area in the area closer to the front end and / or the rear end than the oily component-disposed area. This makes it possible to conceal to a certain extent menstrual blood absorbed by the absorbent core in the areas closer to the front end and the rear end, thereby making it less likely for the wearer to feel anxious about the possibility of menstrual blood leaking from the front or rear of the shorts-type napkin. Examples of the colored area include a printed area.

[0171] In the shorts-type napkin according to the present disclosure, in the unfolded state, the liquid-impermeable sheet and the outer casing may not have a colored portion in the area overlapping with the oily component-disposed region, which makes it easier for the wearer to visually recognize from the outside of the shorts-type napkin that the absorbent core has absorbed menstrual blood, and makes it easier for the wearer to get the impression that the shorts-type napkin is reliably absorbing menstrual blood and is less likely to leak.

[0172] The shorts-type napkin may be free of a volatile cooling agent. This prevents oily components from interfering with the sliding of menstrual blood down to the absorbent core, resulting in excellent menstrual blood absorption. Furthermore, the volatile cooling agent is prevented from irritating the area around the excretory opening, which is sensitive to menstruation. The vapor pressure of the volatile cooling agent at 20°C is preferably 0.1 Pa or more, more preferably 1.0 Pa or more, even more preferably 10 Pa or more, and even more preferably 100 Pa or more.

[0173] In the present disclosure, the oily component has the same effect as the blood slipping agent described in Patent Document 2, and plays a role in allowing menstrual blood to slide from the skin side sheet, preferably from the top sheet, to the absorbent core. The oily component has a viscosity of preferably 0.01 to 80 mm at 40°C. 2 / s, more preferably 1 to 70 mm 2 / s, more preferably 3 to 60 mm 2 / s, and even more preferably 5 to 50 mm 2 / s, and even more preferably 7 to 45 mm 2 / s.

[0174] In addition, the oil component has a viscosity of 0.01 to 80 mm at 40°C. 2 In order to have a kinematic viscosity of 80 mm / s, it is preferable that the melting point of the oily component is 45°C or lower. This is because if the oily component contains crystals at 40°C, the kinematic viscosity tends to increase. In this specification, the kinematic viscosity at 40°C may be simply referred to as "kinematic viscosity". 2 If the viscosity exceeds 1 / s, the oily component will have high viscosity and will tend to have difficulty sliding down from the skin-side sheet, preferably the top sheet, to the absorbent core together with menstrual blood.

[0175] The kinematic viscosity can be measured at a test temperature of 40°C using a Cannon-Fenske reverse flow viscometer in accordance with JIS K 2283:2000, "5. Kinematic viscosity test method."

[0176] The oily component preferably has a water holding percentage of 0.01 to 4.0% by mass, more preferably 0.02 to 3.5% by mass, even more preferably 0.03 to 3.0% by mass, even more preferably 0.04 to 2.5% by mass, and even more preferably 0.05 to 2.0% by mass.

[0177] As used herein, "water holding rate" refers to the proportion of water that a substance can hold, and can be measured as follows: (1) A test tube, rubber stopper, substance to be measured, and deionized water are left standing overnight in a thermostatic chamber at 40°C. (2) In the thermostatic chamber, 5.0 g of the substance to be measured and 5.0 g of deionized water are placed in a 20 mL test tube. (3) In the thermostatic chamber, the mouth of the test tube is sealed with a rubber stopper, rotated once, and left standing for 5 minutes.

[0178] (4) In the constant temperature room, 3.0 g of the layer of the substance to be measured (usually the upper layer) is placed in a 90 mm diameter glass petri dish (mass: W0). (5) The petri dish is heated in an oven at 105°C for 3 hours to evaporate the water, and the mass of the entire dish is measured (mass: W1). (6) The water holding percentage is calculated according to the following formula: Water holding percentage (mass%) = 100 x (W0 - W1) / 3.0 The measurement is carried out three times, and the average value is used.

[0179] The oily component preferably has a weight-average molecular weight of less than 1,000, and more preferably less than 900. If the weight-average molecular weight is 1,000 or more, the oily component itself tends to become tacky, causing discomfort to the wearer. The oily component preferably has a weight-average molecular weight of 100 or more, and more preferably a weight-average molecular weight of 200 or more. If the weight-average molecular weight is small, the vapor pressure of the oily component increases, which can lead to evaporation during storage, loss of volume, odor when worn, and other problems.

[0180] In this specification, the term "weight average molecular weight" is a concept that includes polydisperse compounds (for example, compounds produced by sequential polymerization, esters produced from a plurality of fatty acids and a plurality of aliphatic monohydric alcohols) and single compounds (for example, esters produced from one type of fatty acid and one type of aliphatic monohydric alcohol). i Molecular weight M i In a system consisting of molecules (i=1, or i=1, 2, ...) of the following formula: M w =ΣN i M i 2 / ΣN i M i M obtained by w means.

[0181] In this specification, the weight average molecular weight refers to a polystyrene-equivalent value determined by gel permeation chromatography (GPC). Measurement conditions for GPC include, for example, the following: Model: High-performance liquid chromatogram Lachrom Elite manufactured by Hitachi High-Technologies Corporation Column: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko K.K. Eluent: THF Flow rate: 1.0 mL / min Injection volume: 100 μL Detection: RI (differential refractometer)

[0182] Examples of the oily component include (a1) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a2) an ester of a chain hydrocarbon triol and at least one fatty acid, (a3) ​​an ester of a chain hydrocarbon diol and at least one fatty acid, (b1) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b2) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b3) an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c1) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, and (c2) a chain hydrocarbon tricarboxylic acid having three carboxyl groups. (c3) esters of linear hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy acids, alkoxy acids or oxo acids and at least one aliphatic monohydric alcohol, (d1) ethers of linear hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy acids, alkoxy acids or oxo acids and at least one aliphatic monohydric alcohol, (d2) dialkyl ketones, (d3) esters of fatty acids and aliphatic monohydric alcohols, (d4) dialkyl carbonates, (e1) polyoxy C3-C6 alkylene glycols, (e2) esters of polyoxy C3-C6 alkylene glycols and at least one fatty acid, (e3) ethers of polyoxy C3-C6 alkylene glycols and at least one aliphatic monohydric alcohol, and (f1) linear alkanes.

[0183] [(a1) Ester of a chain hydrocarbon tetraol and at least one fatty acid] Examples of (a1) ester of a chain hydrocarbon tetraol and at least one fatty acid include a tetraester of pentaerythritol and a fatty acid, a triester of pentaerythritol and a fatty acid, a diester of pentaerythritol and a fatty acid, and a monoester of pentaerythritol and a fatty acid.

[0184] The fatty acids include, for example, saturated fatty acids, such as C2 to C6 30saturated fatty acids such as acetic acid (C2) (C2 means the number of carbon atoms, the same applies hereinafter), propanoic acid (C3), butanoic acid (C4) and its isomers, such as 2-methylpropanoic acid (C4), pentanoic acid (C5) and its isomers, such as 2-methylbutanoic acid (C5), 2,2-dimethylpropanoic acid (C5), hexanoic acid (C6), heptanoic acid (C7), octanoic acid (C8) and its isomers, such as 2-ethylhexanoic acid (C8), nonanoic acid (C9), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ), heptadecanoic acid (C 17 ), octadecanoic acid (C 18 ), eicosanoic acid (C 20 ), docosanoic acid (C 22 ), tetracosanoic acid (C 24 ), hexacosanoic acid (C 26 ), octacosanoic acid (C 28 ), triacontanoic acid (C 30 ) and the like, as well as unlisted isomers thereof.

[0185] The fatty acid may also be an unsaturated fatty acid, such as a C3 to C6 fatty acid. 20 unsaturated fatty acids, such as monounsaturated fatty acids, for example, crotonic acid (C), myristoleic acid (C 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), elaidic acid (C 18 ), vaccenic acid (C 18 ), gadoleic acid (C 20 ), eicosenoic acid (C 20 ), diunsaturated fatty acids, such as linoleic acid (C 18 ), eicosadienoic acid (C 20 ), triunsaturated fatty acids, such as linolenic acid, e.g., α-linolenic acid (C 18 ) and γ-linolenic acid (C 18 ), pinolenic acid (C 18 ), eleostearic acid, for example, α-eleostearic acid (C 18) and β-eleostearic acid (C 18 ), Mead acid (C 20 ), dihomo-γ-linolenic acid (C 20 ), eicosatrienoic acid (C 20 ), tetraunsaturated fatty acids, for example, stearidonic acid (C 20 ), arachidonic acid (C 20 ), eicosatetraenoic acid (C 20 ), etc., pentaunsaturated fatty acids, for example, boseopentaenoic acid (C 18 ), eicosapentaenoic acid (C 20 ) and the like, as well as partial hydrogen adducts thereof.

[0186] The ester of pentaerythritol and a fatty acid is preferably an ester of pentaerythritol and a fatty acid derived from a saturated fatty acid, i.e., an ester of pentaerythritol and a saturated fatty acid, in consideration of the possibility of denaturation due to oxidation, etc. Furthermore, the ester of pentaerythritol and a fatty acid is preferably a diester, triester, or tetraester, more preferably a triester or tetraester, and even more preferably a tetraester, in terms of reducing the water holding percentage.

[0187] Commercially available products of the above-mentioned esters of pentaerythritol and fatty acids include Unistar H-408BRS and H-2408BRS-22 (mixture) (both manufactured by NOF Corporation).

[0188] [(a2) Ester of a Chain Hydrocarbon Triol and at Least One Fatty Acid] Examples of (a2) ester of a chain hydrocarbon triol and at least one fatty acid include triesters of glycerin and fatty acids, diesters of glycerin and fatty acids, and monoesters of glycerin and fatty acids.

[0189] The fatty acid is as described above. From the viewpoint of reducing the water holding percentage, the ester of glycerin and fatty acid is preferably a diester or triester, and more preferably a triester.

[0190] Examples of the triesters of glycerin and two or more fatty acids include triesters of glycerin and octanoic acid (C8) and decanoic acid (C9). 10 ), triester of glycerin, octanoic acid (C8), decanoic acid (C 10 ) and dodecanoic acid (C 12 ), triester of glycerin, octanoic acid (C8), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ) and octadecanoic acid (C 18 ) triesters, etc.

[0191] From the viewpoint of achieving a melting point of 45°C or less, the triester of glycerin and a fatty acid preferably has a total carbon number of the fatty acids constituting the triester of glycerin and a fatty acid of about 40 or less.

[0192] Commercially available triesters of glycerin and fatty acids include tri-coconut oil fatty acid glyceride, NA36, Panasate 800, Panasate 800B, and Panasate 810S, as well as tri-C2L oil fatty acid glyceride and tri-CL oil fatty acid glyceride (all manufactured by NOF Corporation), olive oil, and the like.

[0193] [(a3) Ester of a Chain Hydrocarbon Diol and at Least One Fatty Acid] Examples of (a3) ​​ester of a chain hydrocarbon diol and at least one fatty acid include monoesters or diesters of a C2 to C6 chain hydrocarbon diol, such as a C2 to C6 glycol, for example, ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, or hexylene glycol, with a fatty acid.

[0194] Examples of the fatty acid include the fatty acids listed in "(a1) Esters of chain hydrocarbon tetraols and at least one fatty acid." Considering the possibility of denaturation due to oxidation, etc., the ester of a C2-C6 glycol and a fatty acid is preferably an ester of a C2-C6 glycol and a fatty acid derived from a saturated fatty acid, i.e., an ester of a C2-C6 glycol and a saturated fatty acid.

[0195] Furthermore, from the viewpoint of reducing the water holding percentage, the ester of the C2-C6 glycol with a fatty acid is preferably an ester of a glycol with a fatty acid derived from a glycol with a large carbon number, such as an ester of a glycol with a fatty acid derived from butylene glycol, pentylene glycol, or hexylene glycol. Furthermore, from the viewpoint of reducing the water holding percentage, the ester of the C2-C6 glycol with a fatty acid is preferably a diester. Commercially available products of the ester of the C2-C6 glycol with a fatty acid include, for example, Compol BL and Compol BS (both manufactured by NOF Corporation).

[0196] [(b1) Ethers of Chain Hydrocarbon Tetraols and At Least One Aliphatic Monohydric Alcohol] Examples of (b1) ethers of chain hydrocarbon tetraols and at least one aliphatic monohydric alcohol include tetraethers, triethers, diethers, and monoethers of pentaerythritol and aliphatic monohydric alcohols.

[0197] Examples of the aliphatic monohydric alcohol include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols. Examples of the saturated aliphatic monohydric alcohol include C1 to C6 20saturated aliphatic monohydric alcohols such as methyl alcohol (C1) (C1 indicates the number of carbon atoms, the same applies hereinafter), ethyl alcohol (C2), propyl alcohol (C3) and its isomers, such as isopropyl alcohol (C3), butyl alcohol (C4) and its isomers, such as sec-butyl alcohol (C4) and tert-butyl alcohol (C4), pentyl alcohol (C5), hexyl alcohol (C6), heptyl alcohol (C7), octyl alcohol (C8) and its isomers, such as 2-ethylhexyl alcohol (C8), nonyl alcohol (C9), decyl alcohol (C 10 ), dodecyl alcohol (C 12 ), tetradecyl alcohol (C 14 ), hexadecyl alcohol (C 16 ), hepradecyl alcohol (C 17 ), octadecyl alcohol (C 18 ), and eicosyl alcohol (C 20 ), as well as unlisted isomers thereof.

[0198] Examples of the unsaturated aliphatic monohydric alcohol include those in which one of the C-C single bonds of the saturated aliphatic monohydric alcohols is substituted with a C=C double bond, such as oleyl alcohol, which is commercially available from New Japan Chemical Co., Ltd. under the names of the Rikacol series and the Angecool series.

[0199] [(b2) Ethers of Linear Hydrocarbon Triols and At Least One Aliphatic Monohydric Alcohol] (b2) Ethers of Linear Hydrocarbon Triols and At Least One Aliphatic Monohydric Alcohols include, for example, triethers, diethers, and monoethers of glycerin and aliphatic monohydric alcohols. The aliphatic monohydric alcohols are as described above.

[0200] [(b3) Ethers of Linear Hydrocarbon Diols and At Least One Aliphatic Monohydric Alcohol] (b3) Ethers of linear hydrocarbon diols and at least one aliphatic monohydric alcohol include diethers of C2-C6 glycols and aliphatic monohydric alcohols, and monoethers of C2-C6 glycols and aliphatic monohydric alcohols. The aliphatic monohydric alcohols are as described above.

[0201] [(c1) Esters of a Chain Hydrocarbon Tetracarboxylic Acid, Hydroxy Acid, Alkoxy Acid, or Oxoacid Having Four Carboxyl Groups and At Least One Aliphatic Monohydric Alcohol] Examples of (c1) esters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having four carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, triesters, and tetraesters, preferably diesters, triesters, and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters, of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having four carboxyl groups and at least one aliphatic monohydric alcohol.

[0202] Examples of the chain hydrocarbon tetracarboxylic acid include alkanetetracarboxylic acids such as butanetetraacid, pentanetetraacid, hexanetetraacid, heptanetetraacid, octanetetraacid, nonanetetraacid, and decanetetraacid. The aliphatic monohydric alcohol is as described above.

[0203] [(c2) Esters of a Linear Hydrocarbon Tricarboxylic Acid, Hydroxy Acid, Alkoxy Acid, or Oxoacid Having Three Carboxyl Groups and At Least One Aliphatic Monohydric Alcohol] Examples of (c2) esters of a linear hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having three carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, and triesters, preferably diesters and triesters, and more preferably triesters, of a linear hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having three carboxyl groups and at least one aliphatic monohydric alcohol.

[0204] Examples of the linear hydrocarbon tricarboxylic acid include alkane tricarboxylic acids such as propane triacid, butane triacid, pentane triacid, hexane triacid, heptane triacid, octane triacid, nonane triacid, and decane triacid. The aliphatic monohydric alcohols are as described above. An example is O-acetyl tributyl citrate, which is commercially available.

[0205] [(c3) Esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol] Examples of (c3) esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol include monoesters and diesters, preferably diesters, of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol.

[0206] Examples of the linear hydrocarbon dicarboxylic acid include alkane dicarboxylic acids such as ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, and decanedioic acid. The aliphatic monohydric alcohols are as described above. An example is dioctyl adipate, which is commercially available.

[0207] [(d1) Ether of an Aliphatic Monohydric Alcohol and an Aliphatic Monohydric Alcohol] The ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol is represented by the following formula (1): 1 OR 2 (1) (wherein, R 1 and R 2 and each of R is a chain hydrocarbon. 1 OH and R 2 The groups corresponding to OH are as described above.

[0208] [(d2) Dialkyl ketone] The dialkyl ketone is a ketone represented by the following formula (2): 3 COR 4 (2) (wherein, R 3 and R 4 wherein each of the is an alkyl group. The dialkyl ketones are commercially available, or can be obtained by known methods, for example, by oxidizing a secondary alcohol with chromic acid or the like.

[0209] [(d3) Ester of Fatty Acid and Aliphatic Monohydric Alcohol] Examples of the ester of fatty acid and aliphatic monohydric alcohol include those represented by the following formula (3): 5 COOR 6 (3) (wherein, R 5 and R 6 are each a chain hydrocarbon).

[0210] The fatty acid constituting the ester (in formula (3), R 5 Examples of the aliphatic monohydric alcohol (corresponding to R COOH) that constitutes the ester include the above-mentioned fatty acids, and saturated fatty acids are preferred in view of the possibility of denaturation due to oxidation, etc. 6 Examples of the alkyl group (corresponding to OH) include the above-mentioned aliphatic monohydric alcohols.

[0211] Examples of the esters of the fatty acids and aliphatic monohydric alcohols include dodecanoic acid (C 12) and dodecyl alcohol (C 12 ), esters with tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 Examples of commercially available esters of the above fatty acids and aliphatic monohydric alcohols include Electol WE 20 and Electol WE 40 (both manufactured by NOF Corporation).

[0212] [(d4) Dialkyl Carbonate] The dialkyl carbonate may be a dialkyl carbonate represented by the following formula (4): 7 OC(=O)OR 8 (4) (wherein, R 7 and R 8 wherein each of is an alkyl group. The dialkyl carbonates are commercially available, or can be synthesized by the reaction of phosgene with an alcohol, the reaction of a chloroformate with an alcohol or an alcoholate, or the reaction of silver carbonate with an alkyl iodide.

[0213] [(e1) Polyoxy C3-C6 alkylene glycol] The polyoxy C3-C6 alkylene glycol refers to i) a homopolymer having an oxy C3-C6 alkylene skeleton, i.e., any one skeleton selected from the group consisting of an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton, and having hydroxy groups at both ends, ii) a block copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends, or iii) a random copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends. Commercially available poly C3-C6 alkylene glycols include Uniol (trademark) PB-500 and PB-700 (both manufactured by NOF Corporation).

[0214] [(e2) Ester of polyoxy C3-C6 alkylene glycol and at least one fatty acid] Examples of the ester of polyoxy C3-C6 alkylene glycol and at least one fatty acid include those in which one or both OH terminals of the polyoxy C3-C6 alkylene glycol explained in the section "(e1) Polyoxy C3-C6 alkylene glycol" are esterified with a fatty acid, i.e., monoesters and diesters. The fatty acid is as described above.

[0215] [(e3) Ethers of Polyoxy C3-C6 Alkylene Glycol and At Least One Aliphatic Monohydric Alcohol] Examples of the ethers of the polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol include those in which one or both OH terminals of the polyoxy C3-C6 alkylene glycol explained in the section "(e1) Polyoxy C3-C6 Alkylene Glycol" are etherified with an aliphatic monohydric alcohol, i.e., monoethers and diethers. The aliphatic monohydric alcohol is as described above.

[0216] [(f1) Chain Alkanes] Examples of (f1) chain alkanes include linear alkanes and branched alkanes. Commercially available examples of the hydrocarbons include Parleam 6 (NOF Corporation).

[0217] REFERENCE SIGNS LIST 1 shorts-type napkin 3 absorbent body 5 outer body 7 ventral region 9 back region 11 front end 13 back end 21 top sheet 25 second sheet 27 absorbent body 27a absorbent core 29 liquid-impermeable sheet 31 elastic member 33 elastic member arrangement region 35 hydrophobic nonwoven fabric sheet 41 oily component arrangement region 111 first outer sheet 113a ventral side second outer sheet 113b back side second outer sheet 131 inter-body joint 131a hot melt adhesive 133 inner outer sheet joint 135 core wrap joint 137 inter-film nonwoven fabric joint 137a hot melt adhesive

Claims

1. A shorts-type napkin comprising an absorbent main body having a longitudinal direction and a width direction, and an outer body, wherein, in an unfolded state, the shorts-type napkin has the longitudinal direction, the width direction, and a thickness direction having an inner and outer side that are perpendicular to each other, and is partitioned into a ventral region located closer to the front end from the center of the longitudinal direction, and a dorsal region located closer to the rear end from the center of the longitudinal direction, the absorbent main body comprising an absorbent core, a liquid-permeable skin-side sheet located on the skin side of the absorbent core, and a liquid-impermeable sheet composed of a moisture-permeable film located on the non-skin side of the absorbent core, the absorbent main body having an oily component-disposing region in which an oily component is disposed on the skin-side sheet or the absorbent core, and the shorts-type napkin comprising a hydrophobic nonwoven fabric sheet that is present in the oily component-disposing region and is located on the non-skin side of the liquid-impermeable sheet in a plan view in the unfolded state.

2. The shorts-type napkin according to claim 1, wherein the hydrophobic nonwoven fabric sheet is disposed adjacent to the non-skin side of the liquid-impermeable sheet.

3. A shorts-type napkin as described in claim 2, wherein, within the oily component placement area in a plan view in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at film-nonwoven fabric joints arranged intermittently in the longitudinal direction and / or the width direction.

4. A shorts-type napkin according to any one of claims 1 to 3, wherein the hydrophobic nonwoven fabric sheet comprises a high-density layer disposed on the skin side and a low-density layer disposed adjacent to the high-density layer on the non-skin side and having a lower density than the high-density layer.

5. The shorts-type napkin according to claim 4, wherein the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at a film-nonwoven fabric joint, and the hydrophobic nonwoven fabric sheet further comprises a low-density layer having a lower density than the high-density layer, arranged adjacent to the high-density layer on the skin side.

6. A shorts-type napkin according to any one of claims 1 to 5, wherein the hydrophobic nonwoven fabric sheet has a plurality of embossed portions, at least some of which are recessed inward.

7. A shorts-type napkin according to any one of claims 1 to 6, wherein the shorts-type napkin is provided with an additional hydrophobic nonwoven fabric sheet that is present within the oily component placement area and is positioned adjacent to the hydrophobic nonwoven fabric sheet on the non-skin side when viewed in a plan view in the unfolded state.

8. A shorts-type napkin as described in claim 7, wherein, within the oily component placement area in a plan view in the unfolded state, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are joined at inter-nonwoven fabric joints arranged intermittently in the longitudinal direction and / or the width direction.

9. A shorts-type napkin as described in claim 8, wherein, in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet are joined at film-nonwoven fabric joints arranged intermittently in the longitudinal direction and / or the width direction, and the film-nonwoven fabric joints and the nonwoven fabric joints have non-overlapping joint portions that do not overlap each other in the thickness direction.

10. A shorts-type napkin according to any one of claims 7 to 9, wherein the shorts-type napkin has the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet in the back region when viewed in a plan view in the unfolded state.

11. A shorts-type napkin as described in any one of claims 1 to 10, wherein the absorbent body further comprises a core wrap covering the absorbent core from the liquid-impermeable sheet side, and within the oily component placement area in a plan view in the unfolded state, the core wrap and the liquid-impermeable sheet are joined at core wrap joints arranged intermittently in the longitudinal direction and / or the width direction.

12. The shorts-type napkin according to any one of claims 1 to 11, further comprising an oil-absorbent or oil-retaining sheet between the absorbent core and the liquid-impermeable sheet.

13. A shorts-type napkin as described in any one of claims 1 to 12, wherein the shorts-type napkin is provided with an elastic member that is arranged on the non-skin side of the absorbent core and is disposed in the longitudinal direction from the ventral region to the dorsal region, and in the unfolded state, the oily component arrangement region and the elastic member overlap in the thickness direction.

14. The shorts-type napkin according to claim 13, wherein, in the unfolded state and viewed from above in the longitudinal direction, the oily component-disposing region is disposed within the elastic member-disposing region.

15. A shorts-type napkin as described in any one of claims 1 to 14, wherein in the ventral region, the outer casing has a multiple-sheet region consisting of multiple sheets arranged toward the front end, and a single-sheet region consisting of a single sheet arranged toward the rear end, and in the ventral region in the unfolded state, the oily component-arranged region overlaps with the single-sheet region in the thickness direction, but does not overlap with the multiple-sheet region in the thickness direction.

16. A shorts-type napkin as described in any one of claims 1 to 15, wherein in the back region, the outer casing has a single-sheet region consisting of a single sheet arranged near the front end and a multiple-sheet region consisting of multiple sheets arranged near the rear end, and in the back region in the unfolded state, the oily component-arranged region overlaps with the single-sheet region and the multiple-sheet region in the thickness direction.

17. A shorts-type napkin as described in any one of claims 1 to 16, wherein in the unfolded state and in the area overlapping with the absorbent core in the thickness direction, the liquid-impermeable sheet or the outer body has a colored portion in a range closer to the front end or rear end than the oily component-disposed area.

18. A shorts-type napkin as described in claim 17, wherein, when viewed in a plan view from the thickness direction in the unfolded state, the liquid-impermeable sheet and the outer casing do not have a colored portion in the area overlapping with the oily component placement area.

Images