Pants-type sanitary napkin

Abstract

The utility model provides a shorts-type sanitary napkin which can restrain menstrual blood and the like from being attached to other articles even under the condition that the menstrual blood or a part of components of the menstrual blood permeates a liquid-tight sheet. The shorts-type sanitary napkin (1) is provided with an absorbent main body (3) and an exterior body (5), and is characterized in that the absorbent main body (3) is provided with a top sheet (21), an absorbent core (27a), and a liquid-impermeable sheet (29) comprising a moisture-permeable film, the absorbent main body (3) has an oily agent arrangement region (41) in which an oily agent is arranged in a skin-side sheet including the top sheet (21) or the absorbent core (27a), and the shorts-type sanitary napkin (1) is provided with a hydrophobic nonwoven fabric sheet (35). And a hydrophobic non-woven fabric sheet (35) that is present in the oily agent arrangement region (41) in plan view in the expanded state and that is arranged on the non-skin side of the liquid-impermeable sheet (29).

Description

Technical Field

[0001] This disclosure relates to shorts-shaped sanitary napkins. Background Technology

[0002] It is known that there are shorts-shaped sanitary napkins.

[0003] For example, Patent Document 1 discloses a shorts-type absorbent article having intersecting vertical, horizontal, and front-back directions, and having a liquid-absorbent body and an outer body. The outer body has a waistband that is elastic in the horizontal direction and is arranged to cover the non-skin side of the absorbent body. The article is characterized in that a volatile cooling agent is applied to the absorbent body, and both ends of the absorbent body in the length direction have at least one body side end piece constituting the absorbent body and at least one outer body side piece constituting the outer body when viewed in the front-back direction. When the waistband is stretched in the horizontal direction, the joint area where adjacent pieces of the body side end piece and the outer body side piece in the front-back direction are joined together is intermittently provided in the horizontal direction.

[0004] In addition, a medication is applied to the top of the sanitary napkin.

[0005] 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. The liquid-permeable top sheet has an uneven structure including protrusions and concave portions on its skin-contact surface. Furthermore, in the area where the liquid-permeable top sheet contacts the excretory opening, at least in the protrusions, a blood-lubricating agent has a thickness of 0.01–80 mm at 40°C. 2 Kinematic viscosity of / s, water retention of 0.01 to 4.0% by mass, and weight-average molecular weight of less than 1000.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2021-164529

[0009] Patent Document 2: International Publication No. 2013 / 129236 Utility Model Content

[0010] The problem to be solved by utility models

[0011] The shorts-type sanitary napkin disclosed herein is not disclosed in Patent Document 1 and Patent Document 2.

[0012] Therefore, the purpose of this disclosure is to provide a panty-type sanitary napkin that can prevent menstrual blood or a portion thereof from adhering to other items even when menstrual blood or a portion thereof passes through the liquid-impermeable sheet.

[0013] Methods for solving problems

[0014] The inventors have invented a panty-shaped sanitary napkin, which comprises an absorbent body and an outer body. The absorbent body has a length direction and a width direction. The panty-shaped sanitary napkin, in its unfolded state, has mutually orthogonal length and width directions and a thickness direction having an inner and outer aspect. It is divided into a ventral region disposed at a position slightly forward of the center of the length direction and a dorsal region disposed at a position slightly backward of the center of the length direction. The absorbent body comprises an absorbent core, a skin-permeable 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 and composed of a moisture-permeable membrane. The absorbent body has an oil-based agent-containing area on the skin-permeable side sheet or the absorbent core. The panty-shaped sanitary napkin also comprises a hydrophobic nonwoven fabric sheet, which, when viewed from above in the unfolded state, exists within the oil-based agent-containing area and is disposed on the non-skin side of the liquid-impermeable sheet.

[0015] Preferably, the hydrophobic nonwoven sheet is disposed adjacent to the non-skin side of the liquid-impermeable sheet.

[0016] Preferably, in the area of ​​the oily agent preparation when viewed from above in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven interfacing portions in the length direction and / or the width direction.

[0017] Preferably, 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.

[0018] Preferably, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by a membrane nonwoven inlay, and the hydrophobic nonwoven sheet further comprises a low-density layer disposed adjacent to the high-density layer on the skin side and having a lower density than the high-density layer.

[0019] Preferably, the hydrophobic nonwoven fabric sheet has a plurality of embossed portions, at least a portion of which is recessed inward.

[0020] Preferably, the shorts-type sanitary napkin has an additional hydrophobic nonwoven fabric sheet, which is present in the oily agent preparation area when viewed from above in the unfolded state, and is disposed adjacent to the hydrophobic nonwoven fabric sheet on the non-skin side.

[0021] Preferably, in the area of ​​the oily agent application when viewed from above in the unfolded state, the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet are joined by nonwoven interfacing portions that are intermittently arranged in the length direction and / or the width direction.

[0022] Preferably, in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven interfacing portions in the length direction and / or the width direction, wherein the membrane nonwoven interfacing portions and the nonwoven interfacing portions have non-overlapping joint portions that do not overlap with each other in the thickness direction.

[0023] Preferably, the shorts-type sanitary napkin, when viewed from above in its unfolded state, has the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back area.

[0024] Preferably, the absorbent body further comprises a core-coating layer that covers the absorbent core from the side of the impermeable sheet, and in the oily agent placement area when viewed from above in the unfolded state, the core-coating layer and the impermeable sheet are joined by core-coating layer joints that are intermittently arranged in the length direction and / or the width direction.

[0025] Preferably, an oil-absorbing or oil-retaining sheet is provided between the absorbent core and the liquid-impermeable sheet.

[0026] Preferably, the panty-type sanitary napkin has an elastic component disposed on the non-skin side of the absorbent core and arranged along the length direction from the abdominal region to the dorsal region, wherein in the unfolded state, the oily agent disposal area and the elastic component overlap in the thickness direction.

[0027] Preferably, in the unfolded state and when viewed from above along the length direction, the oily agent configuration area is disposed inside the elastic component configuration area.

[0028] Preferably, in the ventral region, the outer body has multiple sheet regions composed of multiple sheets arranged near the front end and a single sheet region composed of a single sheet arranged near the rear end. In the unfolded state, in the ventral region, the oily agent placement area overlaps with the single sheet region in the thickness direction but does not overlap with the multiple sheet regions in the thickness direction.

[0029] Preferably, in the back side region, the outer body has a single sheet region composed of a single sheet disposed near the front end and a plurality of sheet regions composed of a plurality of sheets disposed near the rear end, and in the unfolded state, the oily agent disposal region overlaps with the single sheet region and the plurality of sheet regions in the thickness direction in the back side region.

[0030] Preferably, in the unfolded state and within the range overlapping the absorbent core in the thickness direction, the impermeable sheet or the outer casing has a colored portion in the range of the front end or the rear end of the region relative to the oily agent application area.

[0031] Preferably, when viewed from the thickness direction in the unfolded state, the impermeable sheet and the outer casing do not have colored portions within the area overlapping with the oily agent application area.

[0032] Utility Model Effect

[0033] The disclosed panty-type sanitary napkin can prevent menstrual blood or some components of menstrual blood from adhering to other items even when the menstrual blood or some components of menstrual blood pass through the liquid-impermeable sheet. Attached Figure Description

[0034] Figure 1 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0035] Figure 2 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0036] Figure 3 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0037] Figure 4 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0038] Figure 5 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0039] Figure 6 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0040] Figure 7 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0041] Figure 8 This is a diagram illustrating the shorts-type sanitary napkin 1 of the first embodiment.

[0042] Explanation of reference numerals in the attached figures

[0043] 1. Panty-style sanitary napkin

[0044] 3 Absorbent Subjects

[0045] 5 outer body

[0046] 7. Ventral region

[0047] 9. Dorsal region

[0048] 11 Frontend

[0049] 13 backends

[0050] 21 films

[0051] 25 Second Piece

[0052] 27 absorbers

[0053] 27a Absorber Core

[0054] 29 Impermeable Film

[0055] 31 Elastic Components

[0056] 33 Flexible component configuration area

[0057] 35 Hydrophobic Nonwoven Fabric Sheet

[0058] 41 Oiliness agent preparation area

[0059] 111 First Outer Sheet

[0060] 113a ventral second outer coating

[0061] 113b Backside Second Outer Sheet

[0062] 131 Main Indirect Combination

[0063] 131a hot melt adhesive

[0064] 133 External Assembly Part

[0065] 135 core cladding joint

[0066] 137 membrane nonwoven fabric indirect bonding section

[0067] 137a hot melt adhesive Detailed Implementation

[0068] Specifically, this disclosure relates to the following methods.

[0069] [Method 1]

[0070] A shorts-type sanitary napkin, comprising an absorbent body and an outer casing, wherein the absorbent body has a length direction and a width direction, characterized in that...

[0071] The aforementioned panty-type sanitary napkin, when unfolded, has mutually orthogonal length directions, width directions, and thickness directions (inner and outer), and is divided into a ventral region located at a position closer to the front end than the center of the length direction and a dorsal region located at a position closer to the rear end than the center of the length direction.

[0072] The aforementioned absorbent body comprises an absorbent core, a skin-permeable 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 and composed of a moisture-permeable membrane.

[0073] The aforementioned absorbent body has an oil-based agent preparation area on the aforementioned skin side panel or the aforementioned absorbent core.

[0074] The aforementioned panty-type sanitary napkin includes a hydrophobic nonwoven fabric sheet, which, when viewed from above in the unfolded state, exists within the area where the oily agent is applied and is disposed on the non-skin side of the aforementioned liquid-impermeable sheet.

[0075] The inventors of this application have discovered the following issues.

[0076] - In regular sanitary pads that are part of underwear, since the wearer is less likely to feel stuffy compared to the sanitary pad itself, from the point of view of preventing leakage, non-permeable pads are usually used.

[0077] - In the shorts-type sanitary napkin disclosed in Patent Document 1, the wearer is prone to feeling stuffy because the area of ​​the absorbent body is relatively large. Therefore, as a liquid-impermeable sheet, the use of a moisture-permeable membrane, such as a moisture-permeable membrane with openings, is being studied.

[0078] In addition, in panty-style sanitary napkins, the opening can easily separate from the absorbent core, such as when the wearer is lying down, and sometimes menstrual blood is difficult to transfer from the top sheet to the absorbent core.

[0079] - It is known that, in order to improve the absorbency of the absorbent core, if an oily agent (blood lubricating agent) disclosed in Patent Document 2 is applied to the top sheet of a panty-type sanitary napkin, the absorbency of menstrual blood becomes excellent. However, after the lipophilic oily agent slides onto the absorbent core along with the menstrual blood, it passes through the impermeable sheet with micropores for moisture permeability, along with the menstrual blood or a portion thereof. The outer part of the impermeable sheet is sometimes colored red. It should be noted that the situation where the oily agent passes through the impermeable sheet made of a moisture-permeable membrane with openings along with the menstrual blood or a portion thereof is sometimes referred to as "menstrual blood permeability." In addition, the aforementioned "menstrual blood or a portion thereof" is sometimes referred to as "menstrual blood, etc."

[0080] -The mechanism of the above-mentioned menstrual blood permeability is not necessarily clear, but it is speculated that it is caused by the following: oily or amphiphilic oily agents with low polarity can easily pass through the micro-openings of the impermeable sheet together with menstrual blood or a part of menstrual blood.

[0081] The aforementioned panty-type sanitary napkin has a hydrophobic nonwoven fabric sheet disposed on the non-skin side of the liquid-impermeable sheet. Therefore, even if menstrual blood or other substances pass through the liquid-impermeable sheet due to the permeability of menstrual blood, the menstrual blood is unlikely to reach a position further outward than the hydrophobic nonwoven fabric sheet, thereby inhibiting the adhesion of menstrual blood or other substances to other items.

[0082] [Method 2]

[0083] In the shorts-type sanitary napkin described in Method 1, the hydrophobic nonwoven fabric sheet and the non-skin side of the liquid-impermeable sheet are arranged adjacent to each other.

[0084] In the aforementioned panty-type sanitary napkin, the hydrophobic nonwoven fabric sheet and the liquid-permeable sheet are arranged adjacent to each other on their non-skin side. Therefore, even if menstrual blood or the like permeates through the liquid-permeable sheet due to its permeability, the menstrual blood or the like that permeated through the liquid-permeable sheet will not spread to other sheets, etc. The hydrophobic nonwoven fabric sheet can directly inhibit the movement of menstrual blood to the outside of the hydrophobic nonwoven fabric sheet, thereby inhibiting the menstrual blood or the like from adhering to other items.

[0085] [Method 3]

[0086] In the shorts-type sanitary napkin described in method 1 or 2, in the area of ​​the oily agent preparation when viewed from above in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven sections in the length direction and / or the width direction.

[0087] In the aforementioned panty-type sanitary napkin, in the area where the oily agent is applied when viewed from above in the unfolded state, the impermeable sheet and the hydrophobic nonwoven sheet are directly or indirectly joined by a specified membrane nonwoven fabric interfacing. Therefore, in the unjoined portions between the impermeable sheet and the hydrophobic nonwoven sheet, gaps are easily formed between them. Menstrual blood that has permeated through the impermeable sheet is unlikely to reach a position further outward than the hydrophobic nonwoven sheet, thereby inhibiting menstrual blood from adhering to other items.

[0088] [Method 4]

[0089] In any one of the methods 1 to 3, the shorts-type sanitary napkin has 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.

[0090] Because the aforementioned hydrophobic nonwoven fabric sheet has a specified high-density layer and a low-density layer, the high-density layer retains menstrual blood that has passed through the liquid-impermeable sheet due to the permeability of menstrual blood, making it difficult for it to transfer to the low-density layer disposed adjacent to the outside, thereby inhibiting menstrual blood and other substances from adhering to other items.

[0091] [Method 5]

[0092] In the panty-type sanitary napkin described in Method 4, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined together by a membrane nonwoven interfacing. The hydrophobic nonwoven sheet also has a low-density layer disposed adjacent to the high-density layer on the skin side and having a lower density than the high-density layer.

[0093] Because the aforementioned panty-type sanitary napkin has a specified interlocking section between the membrane and the nonwoven fabric, the absorbent body is less prone to twisting compared to cases without this interlocking section, and it can suppress the tearing of the liquid-impermeable sheet caused by friction between the liquid-impermeable sheet and the hydrophobic nonwoven fabric sheet.

[0094] In addition, since the above-mentioned panty-type sanitary napkin has a specified low-density layer, the oily agent that has passed through the liquid-impermeable sheet due to menstrual blood permeability can be transferred from the low-density layer to the high-density layer, which can prevent the oily agent from reducing the bonding strength of the nonwoven fabric interfacing (e.g., the heat-melt adhesive portion).

[0095] Therefore, in the above-mentioned panty-type sanitary napkins, the interlocking part of the membrane nonwoven fabric can suppress the twisting of the absorbent body and the rupture of the liquid-impermeable sheet, and the bonding strength of the interlocking part of the membrane nonwoven fabric is difficult to reduce.

[0096] [Method 6]

[0097] In any one of the methods 1 to 5, the shorts-type sanitary napkin has a plurality of embossed portions, at least a portion of which is recessed inward.

[0098] The aforementioned panty-style sanitary napkin has an inwardly recessed embossed portion. This embossed portion has a higher density compared to the rest of the pad. The inwardly recessed embossed portion has gaps near the inner edge (skin side) and near the outer edge (non-skin side). Therefore, the inwardly recessed embossed portion retains menstrual blood that has permeated through the non-permeable sheet, preventing it from reaching areas further outward than the non-woven fabric sheet, thus inhibiting menstrual blood from adhering to other items.

[0099] [Method 7]

[0100] In any one of the methods 1 to 6, the panty-type sanitary napkin includes an additional hydrophobic nonwoven fabric sheet, which is present in the oily agent preparation area when viewed from above in the unfolded state, and is disposed adjacent to the hydrophobic nonwoven fabric sheet on the non-skin side.

[0101] Because the aforementioned panty-type sanitary napkin has an additional hydrophobic nonwoven fabric sheet, menstrual blood that has passed through the impermeable sheet due to its permeability is less likely to reach the outermost position of the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, thereby inhibiting menstrual blood from adhering to other items.

[0102] [Method 8]

[0103] In the shorts-type sanitary napkin described in Method 7, in the oily agent preparation area viewed from above in the unfolded state, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are joined by nonwoven interlocking portions that are intermittently arranged in the length direction and / or the width direction.

[0104] In the aforementioned panty-type sanitary napkin, since the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are joined by a predetermined nonwoven fabric insemination section, gaps easily form between the unjoined portions of the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet. Due to the permeability of menstrual blood, menstrual blood that has passed through the impermeable sheet is unlikely to reach a position further outward than the additional hydrophobic nonwoven fabric sheet, thereby inhibiting menstrual blood from adhering to other items.

[0105] [Method 9]

[0106] In the panty-type sanitary napkin described in Method 8, in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven interfacing portions in the length direction and / or the width direction, wherein the membrane nonwoven interfacing portions and the nonwoven interfacing portions have non-overlapping joint portions that do not overlap with each other in the thickness direction.

[0107] In the aforementioned panty-type sanitary napkins, since the impermeable sheet and the hydrophobic nonwoven sheet have a defined non-overlapping joint, gaps are more likely to form between the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet outside the nonwoven interlocking portion between the impermeable sheet and the hydrophobic nonwoven sheet. Furthermore, gaps are more likely to form between the impermeable sheet and the hydrophobic nonwoven sheet inside the nonwoven interlocking portion between the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet. As menstrual blood permeates through the impermeable sheet, it is difficult for it to reach a position further outward than the additional hydrophobic nonwoven sheet, thereby inhibiting menstrual blood from adhering to other items.

[0108] [Method 10]

[0109] In any one of the methods 7 to 9, the shorts-type sanitary napkin, when viewed from above in the unfolded state, has the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back side area.

[0110] The aforementioned panty-style sanitary napkin has a hydrophobic nonwoven fabric sheet and an additional hydrophobic nonwoven fabric sheet on the back side. Therefore, in the back side area where body pressure is easily applied, such as during sleep, menstrual blood that has passed through the impermeable sheet is less likely to reach the outer part of the back side area than the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, thereby preventing menstrual blood from adhering to other items.

[0111] [Method 11]

[0112] In any one of the methods 1 to 10, the absorbent body further comprises a core covering layer that covers the absorbent core from the side of the liquid-impermeable sheet. In the oil-based agent preparation area when viewed from above in the unfolded state, the core covering layer and the liquid-impermeable sheet are joined by core covering layer joints that are intermittently arranged in the length direction and / or the width direction.

[0113] In the aforementioned panty-type sanitary napkins, the core layer and the liquid-impermeable sheet have a defined core layer junction. Therefore, in the unjunctioned portion between the core layer and the liquid-impermeable sheet, gaps easily form between them, making it difficult for oily agents and menstrual blood to reach the liquid-impermeable sheet from the core layer, thus hindering menstrual blood permeability and inhibiting the adhesion of menstrual blood and other substances to other items.

[0114] [Method 12]

[0115] In any one of the panty-type sanitary napkins according to methods 1 to 11, an oil-absorbing or oil-retaining sheet is further provided between the absorbent core and the liquid-impermeable sheet.

[0116] The aforementioned panty-type sanitary napkins also have a sheet with specified oil-absorbing or oil-retaining properties. Therefore, the oily agent that has reached the absorbent core can be retained in the sheet, making it difficult for the oily agent to pass through the liquid-impermeable sheet and making it difficult for menstrual blood to permeate.

[0117] [Method 13]

[0118] In any one of the methods 1 to 12, the panty-type sanitary napkin has an elastic member disposed on the non-skin side of the absorbent core and arranged along the length direction from the abdominal region to the dorsal region. In the unfolded state, the oily agent disposal area and the elastic member overlap in the thickness direction.

[0119] The inventors of this application have discovered the following issues.

[0120] - In order to improve the absorbency of the absorbent core, if the agent disclosed in Patent Document 1 is applied to the top sheet of the panty-type sanitary napkin, the top sheet of the panty-type sanitary napkin is easy to separate from the excretion port and the absorbent body. In particular, during the initial period of wear, menstrual blood flows on the surface of the top sheet, which may sometimes lead to leakage (hereinafter, sometimes referred to as "initial surface flow").

[0121] - Initial surface flow is presumed to be caused by the following: it is difficult to produce after the path of menstrual blood from the top sheet into the absorbent core is formed, but before the above path is formed, if no force such as body pressure is applied to the menstrual blood, it is easier for the menstrual blood to slide on the surface of the top sheet than to slide into the interior of the top sheet, depending on the posture.

[0122] In the above-mentioned panty-type sanitary napkin, when unfolded, the oily agent preparation area and the elastic component overlap in the thickness direction. Therefore, the elastic component makes it easy for the absorbent core to come into contact with the discharge port, and menstrual blood easily slides from the top sheet onto the absorbent core. Furthermore, menstrual blood is less likely to cause initial surface flow and leakage.

[0123] It should be noted that even when the top sheet does not have an oil-based agent area, when the wearer wears a panty-style sanitary napkin and applies body pressure to it, some of the oil-based agent will move towards the top sheet, allowing menstrual blood to slide from the top sheet onto the absorbent core.

[0124] Therefore, the above-mentioned panty-style sanitary napkins have excellent absorption of menstrual blood and are less prone to leakage.

[0125] [Method 14]

[0126] In the shorts-type sanitary napkin described in embodiment 13, when in the unfolded state and viewed from above in the length direction, the oily agent preparation area is disposed inside the elastic member preparation area.

[0127] In the aforementioned panty-type sanitary napkin, when unfolded and viewed from above along its length, the oil-based agent area is located inside the elastic member area. Therefore, even if menstrual blood initially flows across the surface of the oil-based agent area in the width direction, menstrual blood can still be transferred to the absorbent core via the top sheet in the un-oil-based agent area located outside the width direction of the oil-based agent area, thus preventing leakage.

[0128] [Method 15]

[0129] In any one of the methods 1 to 14, in the above-mentioned abdominal region, the outer body has a plurality of sheet areas composed of a plurality of sheets disposed at the front end and a single sheet area composed of a single sheet disposed at the rear end. In the above-mentioned abdominal region in the above-mentioned unfolded state, the oily agent disposal area overlaps with the single sheet area in the thickness direction and does not overlap with the plurality of sheet areas in the thickness direction.

[0130] In the aforementioned panty-style sanitary napkin, in the unfolded state, the oil-based agent area and the individual pad area overlap in the thickness direction on the abdominal side. Therefore, in the individual pad area, the oil causes menstrual blood to slide onto the absorbent core, making it easy for the wearer to see the blood-stained absorbent core from the non-skin side of the panty-style sanitary napkin, providing the wearer with a sense of security regarding the absorbency of menstrual blood. Furthermore, because the oil-based agent area does not overlap in multiple pad areas, initial surface flow of menstrual blood is less likely, thus suppressing leakage.

[0131] [Method 16]

[0132] In any one of the methods 1 to 15, in the back side region, the outer body has a single sheet region composed of a single sheet disposed at the front end and a plurality of sheet regions composed of a plurality of sheets disposed at the rear end. In the back side region in the unfolded state, the oily agent disposal region overlaps with the single sheet region and the plurality of sheet regions in the thickness direction.

[0133] In the aforementioned panty-style sanitary napkin, in the unfolded state, the oily agent application area overlaps with both the single-sheet and multiple-sheet areas in the thickness direction on the back side. Therefore, in both the single-sheet and multiple-sheet areas, the oily agent allows menstrual blood to slide onto the absorbent core, thus inhibiting leakage.

[0134] [Method 17]

[0135] In any one of the methods 1 to 16, in the unfolded state and within the range overlapping with the absorbent core in the thickness direction, the liquid-impermeable sheet or the outer casing has a colored portion in the range of the front end or the rear end of the area where the oily agent is disposed.

[0136] Because the aforementioned panty-shaped sanitary napkin has a designated colored portion, it can conceal the menstrual blood absorbed by the core to a certain extent from the non-skin side of the panty-shaped sanitary napkin in the area near the front end and the area near the back end, making it less likely for the wearer to feel uneasy about the possibility of menstrual blood leaking from the front or back of the panty-shaped sanitary napkin.

[0137] [Method 18]

[0138] In the shorts-type sanitary napkin described in Method 17, when viewed from the thickness direction in the unfolded state, the liquid-impermeable sheet and the outer casing do not have colored portions in the area overlapping with the oily agent preparation area.

[0139] Because the aforementioned panty-style sanitary napkins do not have a designated colored section, the wearer can easily visually confirm from the non-skin side of the panty-style sanitary napkin that the absorbent core has absorbed menstrual blood, giving the wearer the impression that the panty-style sanitary napkins effectively absorb menstrual blood and are difficult to leak.

[0140] The following is a detailed description of the panty-shaped sanitary napkin disclosed herein.

[0141] [First Implementation Method]

[0142] Figures 1 to 7 This is a diagram illustrating a panty-shaped sanitary napkin 1 according to one embodiment of this disclosure (hereinafter referred to as the "first embodiment"). Specifically, Figure 1 This is a 3D image of a panty-style sanitary napkin (model 1). Figure 2 as well as Figure 3 These are images of the inner and outer surfaces of the shorts-type sanitary napkin 1 in its unfolded state. Figure 4 as well as Figure 5 These are diagrams of the inner and outer surfaces of the absorbent body 3 in its unfolded state. Figure 6 yes Figure 2 The diagram shows the end face of the VI-VI type sanitary napkin 1. It should be noted that... Figure 6 In the middle, the compression part 37 is omitted, and all the joints are not shown. Figure 7 yes Figure 2 A magnified view of the end face of the shorts-type sanitary napkin 1 with the VI-VI end face. Figure 8 yes Figure 2 A magnified view of the end face of the shorts-type sanitary napkin 1 at the VIII-VIII end face.

[0143] The panty-type sanitary 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 locking portions 105 (one locking portion 105a and the other locking portion 105b) extending from the waist opening 101 toward the pair of leg openings 103. The pair of locking portions 105 lock the abdominal region 7 and the dorsal region 9, which will be described later.

[0144] The panty-type sanitary napkin 1 has an absorbent body 3 for absorbing menstrual blood and an outer body 5 with a panty-like shape. The absorbent body 3 has a rectangular shape with a length direction L and a width direction W. The absorbent body 3 and the outer body 5 are fixed to the outer body 5 by a body-to-body coupling portion 131 made of hot melt adhesive.

[0145] The panty-style sanitary napkin 1, when unfolded, has a length direction L and a width direction W originating from the absorbent body 3, and a thickness direction T orthogonal to the length direction L and the width direction W. It should be noted that the length direction L and the width direction W refer to the longer and shorter directions of the absorbent body 3, respectively, and not to the longer and shorter directions of the panty-style sanitary napkin 1 when unfolded.

[0146] When unfolded, the panty-style sanitary napkin 1 is divided into a ventral region 7 located at a front end 11 of the ventral region 7 and a dorsal region 9 located at a rear end 13 of the ventral region 7, which is positioned along the length direction W from the center of the length direction L of the panty-style sanitary napkin 1. It should be noted that the front end 11 and the rear end 13 refer to the edge of the ventral region 7 and the edge of the dorsal region 9 that divide the waist opening 101, respectively.

[0147] The outer garment 5 includes: a first outer garment piece 111 extending from the ventral region 7 to the back region 9 and disposed on the clothing side; a second ventral outer garment piece 113a extending to the ventral region 7 and disposed on the skin side; and a second back outer garment piece 113b extending to the back region 9 and disposed on the skin side. The first outer garment piece 111, the second ventral outer garment piece 113a, and the second back outer garment piece 113b are each made of a hydrophobic nonwoven fabric sheet.

[0148] The second outer flap 113a is disposed on the skin side of the first outer flap 111 in the thickness direction T, and in the length direction L, it extends from the front end 11 of the waist opening 101 to the front of the length center line LC. Furthermore, the second outer flap 113a is disposed from one locking portion 105a to the other locking portion 105b in the width direction W.

[0149] The second outer cover 113b on the back side is disposed on the skin side of the first outer cover 111 in the thickness direction T, and in the length direction L it extends from the rear end 13 of the waist opening 101 to the front of the center line LC in the length direction. In addition, the second outer cover 113b on the back side is disposed from one locking part 105a to the other locking part 105b in the width direction W.

[0150] The first outer cover 111 is folded inward at the front end 11 and the rear end 13, respectively covering the ventral second outer cover 113a and the dorsal second outer cover 113b. In the unfolded state, the outer cover 5 is divided into a single-piece region 51 consisting of a single piece (i.e., the first outer cover 111) and multiple-piece regions 53 consisting of multiple pieces (i.e., the first outer cover 111, and the ventral second outer cover 113a or the dorsal second outer cover 113b).

[0151] A single lamellae region 51 is positioned across the longitudinal centerline LC from the ventral region 7 to the dorsal region 9. Multiple lamellae regions 53 are respectively positioned in the ventral region 7 and the dorsal region 9.

[0152] In the unfolded state, in the multiple sheet regions 53 of the ventral region 7, between the first outer sheet 111 and the ventral second outer sheet 113a, a plurality of ventral elastic members 115 are disposed, extending from a locking portion 105a on one side to a locking portion 105b on the other side and disposed separately in the length direction L. When the plurality of ventral elastic members 115 are extended relative to the first outer sheet 111 and the ventral second outer sheet 113a, they are joined to the first outer sheet 111 and the ventral second outer sheet 113a by an inter-sheet adhesive layer (not shown) made of hot melt adhesive.

[0153] In the unfolded state, in the multiple sheet areas 53 of the back side region 9, between the first outer sheet 111 and the second back outer sheet 113b, there are multiple back-side elastic members 117 that extend from one locking portion 105a to the other locking portion 105b or from one leg opening 103a to the other leg opening 103b and are separately arranged in the longitudinal direction L. Additionally, in the unfolded state, in the multiple sheet areas 53 of the back side region 9, between the first outer sheet 111 and the second back outer sheet 113b, there are three rear leg opening elastic members 119. These three rear leg opening elastic members 119 extend from one locking portion 105a through one leg opening 103a and the other leg opening 103b to the other locking portion 105b, and are bent in a manner that overlaps with the absorbent body 3 and protrudes toward the longitudinal centerline LC.

[0154] Multiple back elastic members 117 and three rear leg elastic members 119, in an extended state relative to the first outer piece 111 and the second back outer piece 113b, are joined to the first outer piece 111 and the second ventral outer piece 113a by an inner joint portion 133 of the outer piece made of hot melt adhesive.

[0155] The absorbent body 3 comprises, in the thickness direction T, a top sheet 21 having a skin-contact surface 23a and a non-skin-contact surface 23b, a second sheet 25, an absorbent core 27a, a liquid-impermeable sheet 29, an elastic component 31, and a hydrophobic nonwoven fabric sheet 35. The absorbent core 27a, together with the core-cladding layer 27b covering the absorbent core 27a, forms the absorbent body 27. The absorbent core 27a is hourglass-shaped and has a pair of constricted necks 27c in the width direction W.

[0156] 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 cladding 27b), and the compression section 37 has a design that mimics a rabbit.

[0157] The core-cladding layer 27b disposed between the absorbent core 27a and the liquid-impermeable sheet 29 is bonded to the absorbent core 27a by the absorbent core 27a and an adhesive layer (not shown) made of hot-melt adhesive. Furthermore, the core-cladding layer 27b disposed between the absorbent core 27a and the liquid-impermeable sheet 29 is bonded to the liquid-impermeable sheet 29 by a core-cladding layer joint 135 made of hot-melt adhesive.

[0158] The absorbent core 27a has a high portion 39 extending along the length direction L at its center in the width direction W. Compared to the portion of the absorbent core 27a other than its high portion 39, the high portion 39 is taller and has a greater weight per unit area. This facilitates contact between the high portion 39 of the absorbent core 27a and the wearer's anal opening, buttocks, etc. The core-covering layer 27b is rolled up and folded into three folds inwards to cover the absorbent core 27a via two fold lines extending parallel to the length direction L. At the center of the absorbent core 27a on the skin side in the width direction W, the core-covering layer 27b has multiple overlapping areas 55, with two overlapping pieces in the thickness direction T and extending along the length direction L.

[0159] The top sheet 21 is configured to cover the second sheet 25 and the absorbent body 27 (absorbent core 27a and core cladding 27b), and is bonded to the liquid-impermeable sheet 29 by a hot-melt adhesive. The liquid-impermeable sheet 29 is made of a moisture-permeable membrane with openings. The liquid-impermeable sheet 29 stands upright together with the leak-proof wall 43 described later, protecting the sides of the liquid-impermeable sheet 29. The hydrophobic nonwoven sheet 35 is made of a hydrophobic nonwoven fabric.

[0160] The elastic member 31 is composed of five filamentous elastic members, which divide the elastic member arrangement area 33. The five filamentous elastic members are arranged along the length direction L from multiple sheet areas 53 of the ventral region 7 through a single sheet area 51 of the ventral region 7 and a single sheet area 51 of the dorsal region 9 to multiple sheet areas 53 of the dorsal region 9. Furthermore, the five filamentous elastic members constituting the elastic member 31 are separated in the width direction W and arranged at certain intervals. When the five filamentous elastic members are stretched relative to the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35, the elastic member 31 is joined to the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35 through a membrane nonwoven fabric insemination portion 137 made of hot-melt adhesive. The elastic member 31 is a component used to facilitate contact between the absorbent body 3, and consequently the absorbent core 27a, and the wearer's excretion opening.

[0161] It should be noted that, in Figure 6The figure shows that the elastic member 31 is disposed on the side of the liquid-impermeable sheet 29, and the membrane nonwoven fabric insemination portion 137 is disposed on the side of the hydrophobic nonwoven fabric sheet 35. However, in reality, the membrane nonwoven fabric insemination portion 137 bonds the elastic member 31 from the side of the liquid-impermeable sheet 29 and the side of the hydrophobic nonwoven fabric sheet 35.

[0162] The absorbent core 27a is divided into a central region 63 in the width direction W, which is disposed at the center of the absorbent core 27a, and a pair of side regions 65 in the width direction W, which are disposed on both outer sides of the central region 63 in the width direction. Five filamentous elastic members constituting the elastic member 31 are disposed in the central region 63 in the width direction. In addition, the oiling agent disposal region 41 is also disposed in the central region 63 in the width direction.

[0163] At both ends of the hydrophobic nonwoven fabric sheet 35 in the width direction W, it is folded inward once and outward once through two fold lines extending parallel to the length direction L, for a total of two folds, forming a leak-proof wall 43. A pair of leak-proof walls 43 are formed at both ends of the hydrophobic nonwoven fabric sheet 35 in the width direction W. Each pair of leak-proof walls 43 has two leak-proof wall elastic members 45 that, in the unfolded state, extend from multiple sheet areas 53 in the ventral region 7 through a single sheet area 51 in the ventral region 7 and the back region 9 along the length direction L to multiple sheet areas 53 in the back region 9. The two leak-proof wall elastic members 45 are extended relative to the leak-proof wall 43 (hydrophobic nonwoven fabric sheet 35) while being bonded to the leak-proof wall 43 (hydrophobic nonwoven fabric sheet 35) using a hot melt adhesive. It should be noted that in each of the pair of leak-proof walls 43, the two leak-proof wall elastic members 45 are joined with the leak-proof wall 43 (hydrophobic nonwoven fabric sheet 35), and the area that will show elasticity is called the elastic area 47.

[0164] A pair of leak-proof walls 43 are made of hydrophobic nonwoven fabric forming a hydrophobic nonwoven sheet 35, which is hydrophobic and stands up from the absorbent body 3 when worn to inhibit menstrual blood leakage.

[0165] The absorbent body 3 has an oil-containing agent preparation area 41 on the non-skin contact surface 23b of the top plate 21, which contains an oil-containing agent.

[0166] The panty-type sanitary napkin 1 has a hydrophobic nonwoven fabric sheet 35 disposed within the oil-based agent application area 41 and adjacent to the non-skin side of the liquid-impermeable sheet 29 when viewed from above in the unfolded state. Therefore, even if menstrual blood or the like permeates through the liquid-impermeable sheet 29 due to its permeability, it can prevent menstrual blood or the like from adhering to other items.

[0167] Furthermore, the nonwoven membrane bonding portion 137, which joins the liquid-impermeable sheet 29 and the hydrophobic nonwoven sheet 35, is composed of a plurality of hot-melt adhesives 137a that extend spirally along the length direction L and are spaced apart in the width direction W within the oily agent application area 41 on their entire surface, particularly when viewed from above in the unfolded state. Therefore, when the nonwoven membrane bonding portion 137 is cut along any straight line parallel to the length direction L, the hot-melt adhesives 137a are intermittently arranged along the length direction L. Similarly, when the nonwoven membrane bonding portion 137 is cut along any straight line parallel to the width direction W, the hot-melt adhesives 137a are intermittently arranged along the width direction W. Because of the nonwoven membrane bonding portion 137, the panty-type sanitary napkin 1 can suppress the twisting of the absorbent body 3 and the rupture of the liquid-impermeable sheet 29.

[0168] Therefore, as Figure 7 as well as Figure 8 As shown, in the unbonded portion between the liquid-impermeable sheet 29 and the hydrophobic nonwoven fabric sheet 35, gaps 151 easily form between them. As a result, menstrual blood 155, which permeates through the fine openings 153 of the liquid-impermeable sheet 29 due to its permeability, is less likely to reach the hydrophobic nonwoven fabric sheet 35, and is less likely to reach positions further outward than the hydrophobic nonwoven fabric sheet 35, thereby inhibiting the adhesion of menstrual blood to other items.

[0169] like Figure 7 As shown, the hydrophobic nonwoven fabric sheet 35 is made of hydrophobic SMS nonwoven fabric, and sequentially comprises a first low-density layer 161, a high-density layer 163, and a second low-density layer 165 from the side of the liquid-impermeable sheet 29. The high-density layer 163 has a relatively higher density than the first low-density layer 161 and the second low-density layer 165. Therefore, through the first low-density layer 161 and the high-density layer 163, oily agents that have permeated through the liquid-impermeable sheet 29 due to menstrual blood permeability can be transferred from the first low-density layer 161 to the high-density layer 163, which can suppress the oily agents from reducing the bonding strength of the inter-layer bonding portion 137 of the membrane nonwoven fabric. In addition, through the high-density layer 163 and the second low-density layer 165, the high-density layer 163 retains menstrual blood that has permeated through the liquid-impermeable sheet 29 due to menstrual blood permeability, making it difficult for it to transfer to the second low-density layer 165.

[0170] The panty-type sanitary napkin 1 includes, when viewed from above in its unfolded state, an oil-based agent preparation area 41 and is disposed adjacent to the non-skin side of a hydrophobic nonwoven fabric sheet 35 as an additional hydrophobic nonwoven fabric sheet, consisting of a second outer sheet 113a on the ventral side, a first outer sheet 111, or a second outer sheet 113b on the dorsal side. Specifically, in the plurality of sheet areas 53 in the ventral region 7, the second outer sheet 113a on the ventral side corresponds to an additional hydrophobic nonwoven fabric sheet. In a single sheet area 51 in both the ventral region 7 and the dorsal region 9, the first outer sheet 111 corresponds to an additional hydrophobic nonwoven fabric sheet. In the plurality of sheet areas 53 in the dorsal region 9, the second outer sheet 113b on the dorsal side corresponds to an additional hydrophobic nonwoven fabric sheet. Therefore, due to the permeability of menstrual blood, menstrual blood that has passed through the impermeable sheet 29 is unlikely to reach the outermost position of the second outer sheet 113a on the ventral side, the first outer sheet 111, and the second outer sheet 113b on the dorsal side, which are more external than the hydrophobic nonwoven sheet 35 and the additional hydrophobic nonwoven sheet.

[0171] The main body indirect bonding portion 131 is equivalent to a "non-woven fabric indirect bonding portion" that joins the "hydrophobic non-woven fabric sheet 35" of the absorbent main body 3, which is equivalent to the "hydrophobic non-woven fabric sheet", and the "ventral second outer cover sheet 113a, first outer cover sheet 111 or back second outer cover sheet 113b" of the outer cover body 5, which is equivalent to the "additional hydrophobic non-woven fabric sheet".

[0172] The main body indirect bonding portion 131 is composed of a plurality of hot melt adhesives 131a that extend spirally along the length direction L within the oily agent application area 41 on their entire surface, particularly when viewed from above in the unfolded state, and are arranged at certain intervals in the width direction W. Therefore, when the main body indirect bonding portion 131 is cut along any straight line parallel to the length direction L, the hot melt adhesives 131a are arranged intermittently in the length direction L. Furthermore, when the main body indirect bonding portion 131 is cut along any straight line parallel to the width direction W, the hot melt adhesives 131a are arranged intermittently in the width direction W.

[0173] Furthermore, the membrane nonwoven fabric indirect bonding portion 137 and the main body indirect bonding portion 131, which is equivalent to the "nonwoven fabric indirect bonding portion", have non-overlapping joint portions (not shown) that do not overlap with each other in the thickness direction T.

[0174] Therefore, in multiple regions 53, such as Figure 7As shown, in the unbonded portion between the hydrophobic nonwoven fabric sheet 35 and the second outer cover sheet 113b on the back side, gaps 151 easily form between them. As a result, menstrual blood and other substances 155 that have passed through the micro-openings 153 of the liquid-impermeable sheet 29 due to the permeability of menstrual blood are unlikely to reach the second outer cover sheet 113b, even if they have passed through the hydrophobic nonwoven fabric sheet 35, and are unlikely to reach a position further outward than the second outer cover sheet 113b, thereby inhibiting the adhesion of menstrual blood and other substances to other items.

[0175] Additionally, in a single region 51, such as Figure 8 As shown, in the unbonded portion between the hydrophobic nonwoven fabric sheet 35 and the first outer cover sheet 111, gaps 151 easily form between them. As a result, menstrual blood and other substances 155 that have passed through the micro-openings 153 of the liquid-impermeable sheet 29 due to the permeability of menstrual blood are unlikely to reach the first outer cover sheet 111, even if they have passed through the hydrophobic nonwoven fabric sheet 35, and are unlikely to reach positions further outward than the first outer cover sheet 111, thereby inhibiting the adhesion of menstrual blood and other substances to other items.

[0176] In addition, in the dorsal region 9 where body pressure is easily applied, such as during sleep, menstrual blood that has passed through the impermeable sheet 29 due to its permeability is unlikely to reach the outermost position compared to the hydrophobic nonwoven sheet 35 and the first outer sheet 111 and the dorsal second outer sheet 113b, which are equivalent to the additional hydrophobic nonwoven sheet.

[0177] It should be noted that the second outer cover sheet 113a and the first outer cover sheet 111 on the ventral side, which are equivalent to the additional hydrophobic nonwoven fabric sheet, also function in the same way as the second outer cover sheet 113b on the back side.

[0178] In the unfolded state, the core-cladding layer joint 135, which joins the core-cladding layer 27b and the impermeable sheet 29, is composed of a plurality of hot-melt adhesives 135a that extend spirally along the length direction L and are spaced apart in the width direction W within the oily agent preparation area 41 on their entire surface, particularly when viewed from above in the unfolded state. Therefore, when the core-cladding layer joint 135 is cut along any straight line parallel to the length direction L, the hot-melt adhesives 135a are discontinuously arranged along the length direction L. Furthermore, when the core-cladding layer joint 135 is cut along any straight line parallel to the width direction W, the hot-melt adhesives 135a are discontinuously arranged along the width direction W.

[0179] Therefore, as Figure 7 as well as Figure 8As shown, in the unbonded portion between the core layer 27b and the liquid-impermeable sheet 29, gaps 151 easily form between the core layer 27b and the liquid-impermeable sheet 29. As a result, oily agents and menstrual blood have difficulty reaching the liquid-impermeable sheet 29 from the core layer 27b, making it difficult for menstrual blood to permeate.

[0180] The core layer 27b is composed of an oil-absorbing sheet. This allows the oily agent that has reached the absorbent core 27a to be retained in the core layer 27b, making it difficult for the oily agent to pass through the impermeable sheet 29 and thus hindering menstrual blood permeability.

[0181] In the unfolded state, the oily agent preparation area 41 overlaps with the elastic component preparation area 33 of the elastic component 31 in the thickness direction T. Furthermore, in the unfolded state, the central three of the five filamentous elastic components constituting the elastic component 31 overlap with the oily agent preparation area 41 in the thickness direction T. This facilitates contact between the absorbent core 27a and the wearer's discharge opening, allowing menstrual blood to easily slide from the top sheet 21 onto the absorbent core 27a. Additionally, it minimizes initial surface flow of menstrual blood and reduces the likelihood of leakage.

[0182] In the unfolded state, the oily agent placement area 41 and the elastic component placement area 33 reach a position 13 further back than the rear leg elastic component 119 disposed on the outer body 5. Therefore, the oily agent disposed at the rear leg elastic component 13 can, together with the rear leg elastic component 119, suppress the initial surface flow of menstrual blood and allow the menstrual blood to slide onto the absorbent core 27a. Furthermore, the rear leg elastic component 119 can prevent the elastic component 31 from causing the absorbent core 27a to excessively penetrate the wearer's buttocks, ensuring the length of the absorbent core 27a in the width direction W and suppressing leakage.

[0183] In the oil-based agent preparation area 41, the oil-based agent is applied with a substantially uniform weight per unit area, and the area of ​​the oil-based agent preparation area in the ventral region 7 is larger than that in the dorsal region 9. Therefore, the total amount of oil-based agent in the ventral region 7 is greater than that in the dorsal region 9. As a result, in the ventral region 7, the oil-based agent in the ventral region 7 facilitates the flow of menstrual blood from the ventral opening onto the absorbent core 27a from the top sheet 21. Furthermore, in the dorsal region 9, even if menstrual blood flows to the buttocks side due to initial surface flow, the initial surface flow can be suppressed in areas without oil-based agent, and the menstrual blood can be transferred to the absorbent core 27a, thus preventing leakage.

[0184] The length L (not indicated by reference numerals) of the elastic component arrangement area 33 in the dorsal region 9 is longer than the length L (not indicated by reference numerals) of the elastic component arrangement area 33 in the ventral region 7. Therefore, in the ventral region 7, the elastic component 31 is less likely to cause abdominal pain to the wearer, and in the dorsal region 9, the elastic component 31 facilitates the absorption core 27a to follow the gluteal cleft of the wearer's buttocks, suppressing initial surface flow and minimizing leakage in the dorsal region 9.

[0185] When viewed from above in the width direction W in the unfolded state (i.e., viewed from the left or right side) Figure 4 In the state of the absorbent body 3, the oily agent preparation area 41 exists within the elastic area 47 of a pair of leak-proof walls 43. Thus, even in the event of initial surface flow of menstrual blood due to the oily agent, leakage of menstrual blood to the outside of the panty-type sanitary napkin 1 can be suppressed by the leak-proof walls 43 standing upright when worn.

[0186] In the unfolded state, the elastic component configuration area 33 is located 13 rearward from the oiling agent configuration area 41. This elastic component configuration area 33 located 13 rearward from the oiling agent configuration area 41 is referred to as the rear elastic component configuration area 33a. The top sheet 21 does not contain oiling agent in the rear elastic component configuration area 33a. As a result, the absorbent core 27a can easily conform to the buttocks, especially the gluteal crease, reducing the initial surface flow of menstrual blood, especially the initial surface flow towards the rear.

[0187] In the unfolded state, the elastic component configuration area 33 is located at a position further forward 11 than the oiling agent configuration area 41. This elastic component configuration area 33 located further forward 11 than the oiling agent configuration area 41 is referred to as the front elastic component configuration area 33b. The top sheet 21 does not contain the aforementioned oiling agent in the front elastic component configuration area 33b. As a result, the absorbent core 27a can easily conform to the abdomen, reducing the initial surface flow of menstrual blood, especially the forward surface flow.

[0188] In the unfolded state, the absorbent body 3 has protrusions 61 at each of the pair of leg openings 103 (one leg opening 103a and the other leg opening 103b), extending outward from the outer body 5 in the width direction W, forming a pair of protrusions 61. When viewed from above in the width direction W in the unfolded state (i.e., viewed from the left or right side), Figure 2 In the case of the panty-type sanitary napkin 1, the oil-based agent preparation area 41 overlaps with a pair of protrusions 61. Specifically, when viewed from above in the width direction W in the unfolded state, the pair of protrusions 61 are each located within the oil-based agent preparation area 41. Thus, even in the event of initial surface flow of menstrual blood in the width direction W, the pair of protrusions 61 can absorb menstrual blood and suppress leakage.

[0189] In the unfolded back region 9, the oily agent application region 41 overlaps with the single sheet region 51 and multiple sheet regions 53 in the thickness direction T. Thus, the oily agent allows menstrual blood to slide onto the absorbent core 27a in both the single sheet region 51 and the multiple sheet regions 53, thereby suppressing leakage.

[0190] In the dorsal region 9 in the unfolded state, the rear end edge 13 of the oiling agent preparation region 41 (not labeled) is positioned at the front end 11 relative to the front end edge 11 of each of the pair of locking parts 105. Therefore, even if menstrual blood flows to the buttocks side due to initial surface flow, the initial surface flow can be suppressed in the region further rear end 13 than the oiling agent preparation region 41, and the menstrual blood can be transferred onto the absorbent core 27a.

[0191] In the unfolded ventral region 7, the oily agent application area 41 overlaps with the single sheet region 51 in the thickness direction T, but does not overlap with the multiple sheet regions 53 in the thickness direction T. Thus, in the single sheet region 51, the oily agent causes menstrual blood to slide onto the absorbent core 27a, allowing the wearer to visually see the absorbent core 27a stained red by menstrual blood. Furthermore, since the multiple sheet regions 53 do not overlap with the oily agent application area 41, menstrual blood is less likely to initially flow onto the surface, thus suppressing leakage.

[0192] In the ventral region 7 in the unfolded state, the front edge 11 of the oiling agent preparation region 41 (not labeled) is positioned further back 13 than the rear edge 13 of each of the pair of locking parts 105. Therefore, even if menstrual blood flows to the ventral side due to initial surface flow, the initial surface flow can be suppressed in the region further back 11 than the oiling agent preparation region 41, and the menstrual blood can be transferred onto the absorbent core 27a.

[0193] When viewed from above along the length direction L in the unfolded state (i.e., Figure 6 From the viewpoint of the absorbent core 27a, the oily agent placement area 41 is positioned beyond the middle-high portion 39. Therefore, the oily agent positioned on the outer side of the width direction W beyond the middle-high portion 39 allows unabsorbed menstrual blood in the middle-high portion 39, as well as menstrual blood that has initially flowed on the surface, to slide onto the absorbent core.

[0194] In addition, since the core layer 27b has multiple overlapping areas 55 with multiple core layers 27b stacked in the center of the width direction W, the multiple overlapping areas 55 can fit closely to the wearer's excretory opening, buttocks crease, etc. and absorb menstrual blood.

[0195] When viewed from above along the length L in the unfolded state (i.e., viewed from above or below) Figure 4In the state of the absorbent body 3, the oil-based agent preparation area 41 is disposed within the range of the absorbent core 27a at the pair of constricted necks 27c. Thus, even if the initial surface flow of menstrual blood occurs at the location of the pair of constricted necks 27c, the areas of the pair of constricted necks 27c where no oil-based agent is prepared can allow menstrual blood to slide onto the absorbent core.

[0196] When viewed from above in the unfolded state, the oily agent application area 41 does not overlap with the leak-proof wall elastic members 45 of each of the pair of leak-proof walls 43. This prevents the oily agent from contacting the leak-proof wall elastic members 45, weakening the bond between the leak-proof wall elastic members 45 and the sheets constituting the leak-proof walls 43, and reducing the elasticity of the leak-proof wall elastic members 45.

[0197] In its unfolded state, the outer body 5, in the region outside the back side region 9 and the oily agent application region 41 in the width direction W, includes a back elastic member 117 that overlaps with the absorbent core 27a in the thickness direction T and extends in the direction along the width direction W, and a rear leg elastic member 119. This allows the panty-style sanitary napkin 1 to conform to the wearer, particularly the buttocks.

[0198] When unfolded and viewed from above along the length L (i.e., viewed from above or below) Figure 4 In the state of the absorbent body 3, the oily agent placement area 41 is disposed inside the elastic member placement area 33. Thus, even if menstrual blood initially flows on the surface in the width direction W of the oily agent placement area 41, menstrual blood can be transferred to the absorbent core 27a via the top sheet 21 in the area outside the width direction of the oily agent placement area 41 where no oily agent is placed.

[0199] The panty-type sanitary napkin 1 of the first embodiment does not contain a volatile cooling agent. Therefore, it is difficult to prevent the oily agent from causing menstrual blood to slide onto the absorbent core 27a, resulting in excellent menstrual blood absorbency. Furthermore, it can suppress the irritation of the physiologically sensitive area around the discharge opening by the volatile cooling agent.

[0200] The panty-type sanitary napkin of this disclosure is only required to have an absorbent body and an outer casing, and is not particularly limited, but may also have structures other than an absorbent body and an outer casing. The aforementioned panty-type sanitary napkin typically has a waist opening and a pair of leg openings (one leg opening and the other leg opening). The aforementioned panty-type sanitary napkin may have a pair of locking parts (one locking part and the other locking part) for securing the abdominal and dorsal regions. The pair of locking parts may be openable and closable, or may be non-openable and non-closable due to welding or the like. It should be noted that the panty-type sanitary napkin of this disclosure may, for example, be a sanitary napkin with the waistband constructed of a single piece without a pair of locking parts.

[0201] The aforementioned absorbent core has a length direction and a width direction. When unfolded, the panty-style sanitary napkin has a length direction, a width direction, and a thickness direction orthogonal to these length and width directions. It should be noted that the length and width directions used for panty-style sanitary napkins refer to the length and width directions of the absorbent core, and not to the longer and shorter directions of the panty-style sanitary napkin itself. Furthermore, in this specification, when simply referred to as the length direction, width direction, and / or thickness direction, they refer to the length direction, width direction, and / or thickness direction as defined for the panty-style sanitary napkin.

[0202] In this specification, the “unfolded state” associated with panty-type sanitary napkins refers to the state in which the boundaries between the ventral and dorsal regions of the panty-type sanitary napkin, for example, a pair of locking parts, are released as needed, allowing the panty-type sanitary napkin to stretch and unfold in a plane within a range that prevents the material constituting the panty-type sanitary napkin (e.g., nonwoven fabric) from breaking.

[0203] Additionally, in this instruction manual, the unfolded state of the panty-style sanitary napkin is sometimes referred to simply as the "unfolded state".

[0204] The aforementioned panty-style sanitary napkin, when unfolded, is divided into a ventral region located at the front end relative to the center of its length and a dorsal region located at the rear end relative to the center of its length. It should be noted that the front and rear ends refer to the edge of the ventral region and the edge of the dorsal region, respectively, which divide the waist opening.

[0205] The aforementioned absorbent body comprises: an absorbent core, a skin-permeable 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 typically has a liquid-permeable sheet (hereinafter referred to as a "top sheet") having a skin-contact surface. Furthermore, depending on the requirements, it may also include a liquid diffusion sheet disposed between the top sheet and the absorbent core (hereinafter referred to as a "second sheet"), a liquid diffusion sheet disposed between the absorbent core and the liquid-impermeable sheet (hereinafter referred to as a "third sheet"), and a sheet disposed on the non-skin side of the liquid-impermeable sheet (e.g., a non-woven fabric sheet, such as a hydrophobic non-woven fabric sheet). The absorbent core may or may not have a pair of necks that are constricted in the width direction. The absorbent core may also be disposed as an absorbent body together with a core-cladding layer covering the absorbent core.

[0206] The aforementioned absorbent core can be divided into a central region in the width direction, located at the center, and a pair of side regions in the width direction, located on either side of the central region in the width direction. The central region in the width direction refers to 70% of the area in the center of the width direction, excluding the pair of constricted necks, and the pair of side regions in the width direction each refer to 15% of the area on either side of the central region in the width direction.

[0207] The aforementioned absorbent body has an oil-based agent preparation area in the skin-permeable side sheet and / or the absorbent core. Examples of the aforementioned skin-permeable side sheet include a top sheet, a second sheet, and a core-encapsulation layer disposed on the skin side of the absorbent core.

[0208] From the viewpoint of enabling the oily agent to act rapidly on the menstrual blood that has reached the absorbent substrate, the oily agent preparation area is preferably located on the skin-contact surface, interior, or non-skin-contact surface of the top sheet, more preferably on the skin-contact surface or interior, and even more preferably on the skin-contact surface. From the viewpoint of suppressing contamination of the production line of panty-sized sanitary napkins by the oily agent, and contamination of other panty-sized sanitary napkins by the oily agent, the oily agent preparation area is preferably located on the interior or non-skin-contact surface of the top sheet, the second sheet, or the core layer, more preferably on the non-skin-contact surface of the top sheet, the second sheet, or the core layer.

[0209] In the aforementioned oiliness agent formulation area, from the viewpoint of its function, the oiliness agent is preferably present at a concentration of 0.01 g / m³. 2 More preferably, 0.1 g / m 2 The above is further optimized with 0.5g / m 2 The above describes the weight distribution per unit area. Furthermore, in the aforementioned oiling agent formulation area, from the viewpoint of its function, the oiling agent is preferably at a concentration of 20 g / m². 2 Below, 10g / m is preferred. 2 The following is a further preferred option with 5g / m 2 The following is the weight configuration per unit area.

[0210] The aforementioned impermeable sheet is composed of a moisture-permeable membrane.

[0211] The aforementioned impermeable sheet preferably has a density of 1500 g / m³. 2 • A permeability of 24 hours or more, preferably 3000 g / m² 2 • Moisture permeability for more than 24 hours. Additionally, the aforementioned liquid-impermeable sheet preferably has a density of 7200 g / m³. 2 • A permeability of less than 24 hours, preferably 6500 g / m³ 2 • A humidity level of less than 24 hours. This is from the perspective of suppressing stuffiness.

[0212] In this disclosure, the aforementioned moisture permeability can be determined according to JIS Z0208-1976, "Test Method for Moisture Permeability of Moisture-proof Packaging Materials (Cup Method)". It should be noted that the temperature and humidity conditions for the test are set as follows: temperature: 40±0.5℃, relative humidity: 60±2%.

[0213] From the viewpoint of being impermeable to liquid, the above-mentioned moisture-permeable membrane preferably satisfies the following requirements.

[0214] (1) In a constant temperature room at 25℃±5℃, the membrane sample was left to stand for 24 hours.

[0215] (2) On one side of the sample, use a dropper to drop 1 mL of physiological saline from a height of 3 cm to form a water droplet on the membrane.

[0216] (3) After the saline solution is dripped, check within 5 minutes whether the water droplet has passed from one side to the other side.

[0217] (4) Change position and repeat steps (1) to (3) a total of 3 times.

[0218] (5) If physiological saline does not pass through the membrane in all 3 tests, the membrane is judged to be impermeable.

[0219] The aforementioned moisture-permeable membrane may have openings that can be visually confirmed (e.g., pores larger than 20 μm), or it may have micro-openings that are difficult to visually confirm (e.g., pores smaller than 20 μm).

[0220] The disclosed panty-type sanitary napkin includes a hydrophobic nonwoven fabric sheet that, when viewed from above in its unfolded state, exists within the area where the oil-based agent is applied and is disposed on the non-skin side of the liquid-impermeable sheet. Therefore, even if menstrual blood or other substances permeate through the liquid-impermeable sheet due to its permeability, it can prevent menstrual blood or other substances from adhering to other items. Examples of such other items include areas that may come into contact with the wearer, such as the buttocks, for example, the wearer's clothing, bed frame components (e.g., a bed cover), and carpets.

[0221] The aforementioned hydrophobic nonwoven fabric sheet can be disposed adjacent to the non-skin side of the liquid-impermeable sheet, or it can be disposed with other materials sandwiched between the non-skin side of the liquid-impermeable sheet, but it is preferable to be disposed adjacent to the non-skin side of the liquid-impermeable sheet. This prevents menstrual blood that has permeated through the liquid-impermeable sheet from spreading to other sheets, and the hydrophobic nonwoven fabric sheet can directly inhibit the movement of menstrual blood to the outside of the hydrophobic nonwoven fabric sheet, thereby preventing menstrual blood from adhering to other items.

[0222] The panty-type sanitary napkin disclosed herein may also include an additional hydrophobic nonwoven fabric sheet disposed adjacent to the non-skin side of the aforementioned hydrophobic nonwoven fabric sheet when viewed from above in its unfolded state, within the area containing the oily agent. As a result, menstrual blood that has permeated through the impermeable sheet is less likely to reach positions further outward than the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, thereby inhibiting menstrual blood from adhering to other items.

[0223] The aforementioned hydrophobic nonwoven fabric sheet and any additional hydrophobic nonwoven fabric sheet as needed can be sheets that are present in the absorbent body and the outer covering sheet, such as a first outer covering sheet disposed on the non-skin side, a second outer covering sheet on the ventral side extending in the ventral region and disposed on the skin side, a second outer covering sheet on the dorsal side extending in the dorsal region and disposed on the skin side, etc.

[0224] In this specification, the hydrophobic nonwoven fabric sheet and any additional hydrophobic nonwoven fabric sheets as needed are hydrophobic, for example, made of hydrophobic fibers.

[0225] Examples of the aforementioned hydrophobic fibers include synthetic fibers. Examples of synthetic fibers include fibers containing a single component, such as monofilament fibers, or fibers containing multiple components, such as composite fibers. Furthermore, the aforementioned synthetic fibers can be bioplastics, recycled materials, etc.

[0226] Examples of the aforementioned components include, for example, polyolefin polymers, such as polyethylene and polypropylene; polyester polymers, such as terephthalate polymers, such as polyethylene terephthalate (PET), polybutylene terephthalate, and polypentyl terephthalate; polyamide polymers, such as nylon 6 and nylon 6,6; acrylic polymers; polyacrylonitrile polymers; and modified forms thereof.

[0227] The aforementioned hydrophobic fibers may include waterproof cellulose fibers that have been treated with a waterproofing agent to impart water resistance.

[0228] Examples of cellulose-based fibers include natural cellulose fibers, regenerated cellulose fibers, refined cellulose fibers, and semi-synthetic cellulose fibers.

[0229] Examples of natural cellulose fibers include plant fibers, such as pulp fibers, seed hair fibers (e.g., cotton fibers), bast fibers (e.g., hemp), leaf vein fibers (e.g., Manila hemp), and fruit fibers (e.g., coconut).

[0230] The pulp fibers mentioned above include pulp fibers known in this art, such as wood pulp fibers and non-wood pulp fibers. Examples of wood pulp fibers include coniferous pulp fibers and broadleaf pulp fibers. Examples of 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).

[0231] The pulp fibers mentioned above can also be waste paper, recycled pulp fibers, etc.

[0232] Examples of cotton fibers mentioned above include upland cotton (e.g., upland cotton), barbadense cotton, arboreum cotton, and herbaceum cotton.

[0233] In addition, the aforementioned cotton fibers can be organic cotton fibers or pre-organic cotton (trademark) fibers.

[0234] Organic cotton fiber refers to cotton that has been certified by GOTS (Global Organic Textile Standard).

[0235] Examples of the aforementioned regenerated cellulose fibers include rayon, such as viscose rayon obtained from viscose, polynosic fiber, modal fiber, and cuprammonium rayon (also known as "cuprammonium fiber") obtained from a cuprammonium salt solution of cellulose.

[0236] Lyocell fiber is an example of the refined cellulose fiber mentioned above. Specifically, it is made by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope, which is then extruded into a dilute solution of N-methylmorpholine N-oxide to produce fiber. This refined cellulose fiber is, for example, sold on the market as Tencel (trademark).

[0237] Examples of semi-synthetic fibers mentioned above include semi-synthetic cellulose, such as cellulose acetate, such as cellulose triacetate, and cellulose diacetate.

[0238] In the oil-based agent preparation area viewed from above in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet can be joined either without using the membrane nonwoven indirect bonding portion that joins the liquid-impermeable sheet and the hydrophobic nonwoven sheet, or they can be joined using the membrane nonwoven indirect bonding portion, but it is preferred to use the membrane nonwoven indirect bonding portion. This is because the membrane nonwoven indirect bonding portion can suppress the twisting of the absorbent body, the rupture of the liquid-impermeable sheet, etc.

[0239] When the aforementioned impermeable sheet and the aforementioned hydrophobic nonwoven sheet are joined using the aforementioned membrane nonwoven fabric insemination portion, the membrane nonwoven fabric insemination portion is preferably arranged intermittently in the length direction and / or width direction. Therefore, in the unjoined portions between the impermeable sheet and the hydrophobic nonwoven sheet, gaps easily form between them, making it difficult for menstrual blood that has permeated through the impermeable sheet to reach positions further outward than the hydrophobic nonwoven sheet.

[0240] It should be noted that, in addition to the liquid-impermeable sheet and the hydrophobic nonwoven sheet, the above-mentioned nonwoven membrane interlocking parts can also be joined with other components, such as elastic components.

[0241] When the panty-type sanitary napkin of this disclosure includes the additional hydrophobic nonwoven fabric sheet, in the oil-based agent preparation area when viewed from above in the unfolded state, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet can be joined by a nonwoven indirect bonding portion that joins the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, or they can be joined without using the nonwoven indirect bonding portion, but it is preferable to join them by using the nonwoven indirect bonding portion.

[0242] When the aforementioned hydrophobic nonwoven fabric sheet and the aforementioned additional hydrophobic nonwoven fabric are joined using the aforementioned nonwoven fabric indirect bonding portion, the aforementioned nonwoven fabric indirect bonding portion is preferably arranged intermittently in the length direction and / or width direction. Therefore, in the unjoined portions between the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet, gaps easily form between them, making it difficult for menstrual blood, which permeates through the liquid-impermeable sheet, to reach positions further outward than the additional hydrophobic nonwoven fabric sheet.

[0243] It should be noted that, in addition to the aforementioned hydrophobic nonwoven fabric sheet and the aforementioned additional hydrophobic nonwoven fabric, the aforementioned nonwoven fabric interlocking parts can also be joined with other components, such as elastic components.

[0244] In the panty-type sanitary napkin of this disclosure, when the absorbent body further includes a core covering the absorbent core from the side of the liquid-impermeable sheet, in the oil-based agent preparation area when viewed from above in the unfolded state, the core covering and the liquid-impermeable sheet can be joined by a core covering joint that joins the core covering and the liquid-impermeable sheet, or they can be joined without using the core covering joint, but it is preferable to join them by using the core covering joint.

[0245] When the core layer and the impermeable sheet are joined by the core layer joint, the core layer joint is preferably discontinuous in the length direction and / or width direction. This allows gaps to easily form between the unjoined portions of the core layer and the impermeable sheet, making it difficult for oily agents and menstrual blood to reach the impermeable sheet from the core layer, thus hindering menstrual blood permeability.

[0246] It should be noted that, in addition to the core cladding and the liquid-impermeable sheet, the core cladding joint can also be joined to other components, such as elastic components.

[0247] In this specification, the joint (hereinafter sometimes simply referred to as "joint") including the above-mentioned nonwoven fabric inter-joint, the above-mentioned nonwoven fabric inter-joint as needed, the core-cladding joint as needed, etc., can be the joint commonly used in this art, such as adhesive-based joints, such as hot melt adhesives, and thermoplastic resin welds (in the case where at least one of the two or more parts being joined contains thermoplastic resin).

[0248] Furthermore, in order to arrange the joints intermittently in the length and / or width directions, examples include extending the joints, for example, along a predetermined direction (e.g., the length direction or the width direction), and spaced apart in a direction orthogonal to the predetermined direction to form a linear or dotted shape. Examples of such linear joints include spiral, Ω-shaped, and the like.

[0249] The aforementioned hydrophobic nonwoven fabric sheet and / or the aforementioned additional hydrophobic nonwoven fabric sheet may have an inner high-density layer and a low-density layer disposed adjacent to the high-density layer on the non-skin side, having a lower density than the high-density layer. Thus, the high-density layer retains menstrual blood that has permeated through the impermeable sheet due to menstrual blood permeability, making it difficult for it to transfer to the adjacent low-density layer on the outer side.

[0250] Examples of nonwoven fabrics having the aforementioned high-density and low-density layers include SMS nonwoven fabric (spunbond / meltblown / spunbond type nonwoven fabric), hot air nonwoven fabric (e.g., hot air nonwoven fabric having a perforated surface and an air surface), and laminates of nonwoven fabrics having high-density and low-density layers (e.g., laminates of spunbond type nonwoven fabric, laminates of jet-blown nonwoven fabric, etc.).

[0251] Furthermore, the aforementioned hydrophobic nonwoven fabric sheet and / or the additional hydrophobic nonwoven fabric sheet may also have a high-density layer, 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, and a low-density layer disposed adjacent to the high-density layer on the skin side and having a lower density than the high-density layer. This allows the oily agent, which permeates through the impermeable sheet due to menstrual blood permeability, to transfer from the low-density layer to the high-density layer, thus suppressing the oily agent from reducing the bonding strength of the joint (e.g., the inter-joint joint of the membrane nonwoven fabric or the inter-joint joint of the nonwoven fabric).

[0252] As an example of a hydrophobic nonwoven fabric sheet having the aforementioned low-density layer, high-density layer, and low-density layer, SMS nonwoven fabric can be cited.

[0253] The aforementioned hydrophobic nonwoven fabric sheet may also have multiple embossed portions. In this case, it is preferable that at least a portion, and more preferably all of the multiple embossed portions are recessed inwards. This retains menstrual blood that has permeated through the impermeable sheet due to the permeability of menstrual blood in the embossed portion, making it difficult for the menstrual blood held in the embossed portion to reach positions further outwards than the nonwoven fabric sheet. Examples of hydrophobic nonwoven fabrics having multiple embossed portions include spunbond nonwoven fabrics, SMS nonwoven fabrics, dot-bonded nonwoven fabrics, and meltblown nonwoven fabrics.

[0254] The aforementioned nonwoven fabric interlocking portion and the aforementioned nonwoven fabric interlocking portion may have non-overlapping joint portions that do not overlap with each other in the thickness direction, or they may not have such portions, but it is preferable that they do have such portions. By having the aforementioned non-overlapping joint portions, menstrual blood and other substances that permeate through the impermeable sheet due to its permeability are less likely to reach positions further outward than the additional hydrophobic nonwoven fabric sheet.

[0255] When the panty-type sanitary napkin of this disclosure includes an additional hydrophobic nonwoven fabric sheet, the panty-type sanitary napkin preferably has the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in any area of ​​the aforementioned back side region when viewed from above in the unfolded state. More preferably, the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet are present in the aforementioned back side region and the oily agent preparation area when viewed from above in the unfolded state. As a result, in the back side region where body pressure is easily applied, such as during sleep, menstrual blood that has permeated through the liquid-impermeable sheet is less likely to reach positions further outward than the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet.

[0256] The panty-type sanitary napkin disclosed herein may also include an oil-absorbing or oil-retaining sheet between the absorbent core and the liquid-impermeable sheet. This allows the oily agent that has reached the absorbent core to be retained within the sheet, making it difficult for the oily agent to pass through the liquid-impermeable sheet and thus hindering menstrual blood permeation.

[0257] Examples of sheets with oil-absorbing or oil-retaining properties include the core-cladding layer and the third sheet.

[0258] Examples of the oil-absorbing sheets mentioned above include sheets containing the aforementioned cellulose fibers (including waterproof cellulose fibers), such as nonwoven fabrics.

[0259] As an example of the aforementioned oil-retaining sheet, a sheet containing the aforementioned hydrophobic fibers (excluding waterproof cellulose fibers) can be cited, such as nonwoven fabric.

[0260] The panty-type sanitary napkin disclosed herein may include an elastic component disposed on the non-skin side of the absorbent core and arranged along its length from the ventral region to the dorsal region. The area defined by this elastic component is referred to as the elastic component placement area. The aforementioned elastic component may be composed of one or more linear elastic components (e.g., filamentous elastic components) or sheet-like elastic components (e.g., stretchable nonwoven fabric).

[0261] In this instruction manual, "inner side" and "outer side" refer to the direction on the wearer's skin side and the direction on the wearer's non-skin side when viewed from the object, respectively. When the panty-style sanitary napkin is unfolded, the inner and outer sides align with the thickness direction. In this instruction manual, "skin side" and "non-skin side" refer to the wearer's skin side and the wearer's non-skin side when viewed from the object, respectively.

[0262] In this specification, unless otherwise specified, "inner side" and "outer side" refer to "inner side in the width direction" and "outer side in the width direction," respectively.

[0263] When the aforementioned elastic component is composed of multiple linear elastic components, the lengths of the multiple linear elastic components in the longitudinal direction can be the same or different. Furthermore, the multiple linear elastic components can be arranged at the same spacing in the width direction, or they can be arranged at different spacings in the width direction.

[0264] When the shorts-type sanitary napkin of this disclosure has the above-mentioned elastic member, the elastic member is disposed in the central region in the width direction when viewed from above in the unfolded state.

[0265] The position of the aforementioned elastic component in the thickness direction can be arranged on the non-skin side of the absorbent core without any particular limitation. Examples include the space between the absorbent core and the core sheath, the space between the core sheath and the liquid-impermeable sheet, the liquid-impermeable sheet and the sheet constituting the absorbent body disposed on its non-skin side (e.g., a non-woven sheet, such as a hydrophobic non-woven sheet), the absorbent body and the outer sheath, and the space between the two sheets constituting the outer sheath (e.g., a non-woven sheet, such as a hydrophobic non-woven sheet).

[0266] From the viewpoint of facilitating contact between the absorbent core and the wearer's excretory opening, the elastic member is preferably joined to the adjacent sheet in the thickness direction with a stretch ratio of 1.1 times or more, more preferably 1.5 times or more, and even more preferably 2.0 times or more, relative to the adjacent sheet in the thickness direction. Furthermore, from the above viewpoint, the elastic member is preferably joined to the adjacent sheet in the thickness direction with a stretch ratio of 3.5 times or less, more preferably 3.2 times or less, and even more preferably 3.0 times or less, relative to the adjacent sheet in the thickness direction.

[0267] When the panty-type sanitary napkin of this disclosure has the aforementioned elastic component, in the unfolded state, the oily agent preparation area and the elastic component preparation area preferably overlap in the thickness direction. Therefore, the elastic component facilitates contact between the absorbent body, and consequently the absorbent core, and the wearer's discharge opening, allowing menstrual blood to easily slide from the top sheet onto the absorbent core. Furthermore, initial surface flow of menstrual blood is less likely, reducing the risk of leakage.

[0268] In the panty-type sanitary napkin of this disclosure, the total amount of oily agent in the aforementioned ventral region is preferably more than the total amount of oily agent in the aforementioned dorsal region, more preferably 1.1 times or more, and even more preferably 1.3 times or more. Furthermore, the total amount of oily agent in the aforementioned ventral region is preferably 3.0 times or less, more preferably 2.0 times or less, compared to the total amount of oily agent in the aforementioned dorsal region. Therefore, in the ventral region, the oily agent in the ventral region facilitates the flow of menstrual blood from the drain opening down the top sheet onto the absorbent core. Furthermore, in the dorsal region, even if menstrual blood initially flows to the buttocks side due to surface flow, the initial surface flow can be suppressed in areas without oily agent, and the menstrual blood can be transferred to the absorbent core, thus preventing leakage.

[0269] In the panty-type sanitary napkin of this disclosure, the length of the elastic component arrangement area in the longitudinal direction of the dorsal region is preferably longer than the length of the elastic component arrangement area in the longitudinal direction of the ventral region, more preferably 1.1 times or more, further preferably 1.5 times or more, and even more preferably 1.9 times or more. Furthermore, the length of the elastic component arrangement area in the longitudinal direction of the dorsal region is preferably 5.0 times or less, more preferably 4.0 times or less, and even more preferably 3.0 times or less compared to the length of the elastic component arrangement area in the ventral region. Therefore, in the ventral region, the elastic component is less likely to cause abdominal pain for the wearer, and in the dorsal region, the elastic component easily allows the absorbent core to follow the gluteal cleft of the wearer's buttocks, suppressing initial surface flow and minimizing leakage in the dorsal region.

[0270] The panty-type sanitary napkin of this disclosure may, as needed, have a pair of leak-proof walls. Each of the pair of leak-proof walls may have an elastic region extending along its length, or it may not have an elastic region. When the elastic region is present, the pair of leak-proof walls stand upright from the absorbent body during wear, thus suppressing menstrual blood leakage. When the elastic region is absent, the absorbent body, particularly the absorbent core, is difficult to separate from the wearer's discharge opening, and the elastic component facilitates contact between the absorbent core and the discharge opening.

[0271] In the case of the panty-type sanitary napkin of this disclosure having the aforementioned pair of leak-proof walls and the aforementioned elastic region, the aforementioned elastic region can be formed, for example, by a leak-proof wall elastic member. Examples of such leak-proof wall elastic members include the aforementioned filamentous elastic member and sheet-like elastic member. The aforementioned elastic region can be formed by fixing the leak-proof wall elastic member to the leak-proof wall component using a hot-melt adhesive or the like, while the leak-proof wall elastic member is elongated relative to the component constituting the leak-proof wall.

[0272] In the case of the panty-type sanitary napkin of this disclosure having a pair of leak-proof walls, when viewed from the width direction in the unfolded state, the oily agent application area may or may not be present in the elastic area, but it is preferably present in the elastic area of ​​one of the pair of leak-proof walls, and more preferably in the elastic areas of both of the pair of leak-proof walls. Therefore, even in the event of initial surface flow of menstrual blood due to the oily agent, leakage of menstrual blood outside the panty-type sanitary napkin can be suppressed by the leak-proof walls that stand upright when worn.

[0273] In the case of the panty-type sanitary napkin of this disclosure having a pair of leak-proof walls, when viewed from above in the unfolded state, the area where the oily agent is applied may overlap with or not overlap with the elastic member of the leak-proof wall, but it is preferable that they do not overlap. This prevents the following situation: the oily agent comes into contact with the elastic member of the leak-proof wall, weakening the bond between the elastic member of the leak-proof wall and the sheet constituting the leak-proof wall, and the elasticity of the elastic member of the leak-proof wall weakening.

[0274] In the panty-type sanitary napkin of this disclosure, when viewed from above in the unfolded state, the absorbent body may or may not have an extension extending outward from the outer casing at each of the pair of leg openings (one leg opening and the other leg opening). When the panty-type sanitary napkin of this disclosure has the extension, it is preferable that the oil-based agent area overlaps with the extension when viewed from above in the width direction in the unfolded state. Therefore, even in the event of initial surface flow of menstrual blood in the width direction within the oil-based agent area, the extension can absorb menstrual blood and suppress leakage.

[0275] In the panty-type sanitary napkin of this disclosure, in the unfolded state, the aforementioned elastic component configuration area may be present up to the rear end of the aforementioned oily agent configuration area, or it may be absent up to the rear end, without the aforementioned rear elastic component configuration area. When the panty-type sanitary napkin of this disclosure has the aforementioned rear elastic component configuration area, the skin side sheet in this rear elastic component configuration area preferably contains an amount of oily agent less than that in the oily agent configuration area. This makes it difficult for initial surface flow of menstrual blood to occur at the rear. It should be noted that the aforementioned amount can be the amount per unit area, for example, the weight per unit area (g / m²). 2 Additionally, the term "small amount" includes 0 (e.g., 0 g / m³). 2 ).

[0276] Based on the above viewpoints, the unit area weight of the oily agent in the aforementioned rear elastic component configuration area is preferably more than 0.0 times, more preferably more than 0.1 times, and even more preferably more than 0.2 times, relative to the unit area weight of the oily agent in the oily agent configuration area. Furthermore, based on the above viewpoints, the unit area weight of the oily agent in the aforementioned rear elastic component configuration area is preferably less than 1.0 times, more preferably less than 0.9 times, and even more preferably less than 0.7 times.

[0277] In the panty-type sanitary napkin of this disclosure, in the unfolded state, the aforementioned elastic component configuration area may be present up to a position closer to the front end than the aforementioned oily agent configuration area, thus having the aforementioned front elastic component configuration area; alternatively, it may be absent up to a position closer to the front end, thus not having the aforementioned front elastic component configuration area. When the panty-type sanitary napkin of this disclosure has the aforementioned front elastic component configuration area, the skin side sheet in this front elastic component configuration area preferably contains an amount of oily agent less than that in the aforementioned oily agent configuration area. This makes it difficult for initial surface flow of menstrual blood to occur at the front. It should be noted that the aforementioned amount can be the amount per unit area, for example, the weight per unit area (g / m²). 2 Additionally, the term "small amount" includes 0 (e.g., 0 g / m³). 2 ).

[0278] Based on the above viewpoints, the unit area weight of the oily agent in the aforementioned front elastic component configuration area is preferably more than 0.0 times, more preferably more than 0.1 times, and even more preferably more than 0.2 times, relative to the unit area weight of the oily agent in the oily agent configuration area. Furthermore, based on the above viewpoints, the unit area weight of the oily agent in the aforementioned front elastic component configuration area is preferably less than 1.0 times, more preferably less than 0.9 times, and even more preferably less than 0.7 times.

[0279] In the case of the panty-type sanitary napkin of this disclosure having the aforementioned pair of retaining portions, in the unfolded state, the rearward end edge of the oily agent preparation area in the back region can be positioned closer to the front end than the respective frontward end edge of the pair of retaining portions, or it can be not positioned closer to the front end, but it is preferable to position it closer to the front end. Therefore, even if menstrual blood flows to the buttocks side due to initial surface flow, initial surface flow can be suppressed in the region further rearward than the oily agent preparation area, and menstrual blood can be transferred to the absorbent core, thus preventing leakage.

[0280] In the case of the panty-type sanitary napkin of this disclosure having the aforementioned pair of retaining portions, in the unfolded state, the front edge of the oily agent preparation area in the abdominal region can be positioned further back than the rear edge of each of the pair of retaining portions, or it can be positioned away from the rear edge, but it is preferable to position it further back. Therefore, even if menstrual blood flows to the abdominal side due to initial surface flow, the initial surface flow can be suppressed in the area further forward than the oily agent preparation area, and the menstrual blood can be transferred to the absorbent core, thus preventing leakage.

[0281] In the panty-type sanitary napkin of this disclosure, the absorbent core may or may not have a high portion disposed in the center of the width direction. In the panty-type sanitary napkin of this disclosure, when the absorbent core has the high portion, when viewed from above along the length direction in the unfolded state of the panty-type sanitary napkin, the oily agent placement area is preferably disposed overlapping the high portion, and more preferably disposed beyond the high portion. Therefore, the oily agent disposed on the outer side of the width direction beyond the high portion allows unabsorbed menstrual blood in the high portion, and menstrual blood that has initially flowed, to slide onto the absorbent core.

[0282] For the same reason, in the shorts-type sanitary napkin of this disclosure, when the absorbent core has the aforementioned middle and high portion, when viewed from the width direction in the unfolded state, the oily agent preparation area is preferably arranged to overlap with the aforementioned middle and high portion, and more preferably to extend beyond the aforementioned middle and high portion.

[0283] It should be noted that, based on the above viewpoint, the aforementioned middle and high part is preferably configured at least in the area where the excrement abuts, more preferably configured to extend along the length direction through the area where the excrement abuts, and even more preferably configured to extend along the length direction from the area where the excrement abuts to cover the gluteal cleft of the wearer's buttocks.

[0284] In the panty-type sanitary napkin of this disclosure, when the absorbent core has a pair of constricted necks, the oily agent application area, when viewed from the length direction in the unfolded state, may or may not be located within the absorbent core area at the pair of constricted necks, but is preferably located within the absorbent core area at the pair of constricted necks. Therefore, even if initial surface flow of menstrual blood occurs at the constricted necks, the areas at the constricted necks where no oily agent is applied allow menstrual blood to slide onto the absorbent core.

[0285] In the panty-type sanitary napkin disclosed herein, when the absorbent body also includes the core layer, the core layer may or may not have a multi-layered area with multiple core layers stacked in the center of its width direction, but it is preferred to have one. This allows the multi-layered overlapping area to adhere closely to the wearer's anal opening, gluteal cleft, etc., and absorb menstrual blood.

[0286] In the panty-type sanitary napkin disclosed herein, the outer body may have a single sheet area composed of a single piece, or it may have multiple sheet areas composed of multiple pieces.

[0287] In the aforementioned ventral region of the panty-type sanitary napkin of this disclosure, the outer casing may have multiple sheet areas composed of multiple sheets disposed at the front end and a single sheet area composed of a single sheet disposed at the rear end. In this case, in the aforementioned ventral region in the unfolded state, the oily agent placement area preferably overlaps with the single sheet area in the thickness direction, but does not overlap with the multiple sheet areas in the thickness direction. Thus, in the single sheet area, the oily agent causes menstrual blood to slide onto the absorbent core, allowing the wearer to visually see the absorbent core stained red by menstrual blood, providing the wearer with a sense of security regarding the absorption of menstrual blood by the panty-type sanitary napkin. Furthermore, since the multiple sheet areas do not overlap with the oily agent placement area, menstrual blood is less likely to initially flow to the surface, thus suppressing leakage.

[0288] In the back region of the panty-type sanitary napkin of this disclosure, the outer body may have a single sheet region composed of a single sheet disposed at the front end and multiple sheet regions composed of multiple sheets disposed at the rear end. In this case, in the unfolded state, the oily agent disposal area in the back region preferably overlaps with the single sheet region and the multiple sheet regions in the thickness direction. Therefore, in both the single sheet region and the multiple sheet regions, the oily agent allows menstrual blood to slide onto the absorbent core, thus suppressing leakage.

[0289] The aforementioned outer casing may include elastic members for conforming the panty-shaped sanitary napkin of this disclosure to the wearer. For example, the outer casing may include an ventral elastic member extending from one locking portion to the other in the ventral region. The ventral elastic member may be a plurality of linear ventral elastic members separately arranged in the longitudinal direction, or it may be a planar ventral elastic member.

[0290] The aforementioned outer casing may, for example, have a back-side elastic member extending in the width direction in the aforementioned back-side region (e.g., from one locking portion to the other locking portion, and / or from one leg opening to the other leg opening). The aforementioned back-side elastic member may be a plurality of linear back-side elastic members separately arranged in the length direction, or it may be a planar back-side elastic member.

[0291] The aforementioned back-side elastic member preferably overlaps with the absorbent core in the thickness direction in the region outside the width direction of the aforementioned oily agent placement area, and more preferably is directly or indirectly bonded to the aforementioned absorbent body using a hot-melt adhesive or the like. Thus, in the oily agent placement area, the absorbent core can fit snugly against the wearer's skin, and in the region outside the width direction of the oily agent, the width of the absorbent core can be ensured.

[0292] Furthermore, the aforementioned outer casing may have a rear leg opening elastic member extending in the width direction (e.g., from one locking portion along one leg opening, the absorbent body, and the other leg opening to the other locking portion) in the back region. This rear leg opening elastic member may also be bent to protrude towards the centerline in the length direction. Additionally, in the unfolded state of the panty-style sanitary napkin, the rear leg opening elastic member may be partially or completely disconnected in the area overlapping with the absorbent core.

[0293] In the panty-type sanitary napkin of this disclosure, when the outer body has the aforementioned rear leg elastic member, in the unfolded state, the oil-based agent placement area and / or the elastic member placement area can extend beyond the rear leg elastic member and reach a position further back than the rear leg elastic member. Therefore, when the oil-based agent placement area reaches a position further back than the rear leg elastic member, the oil-based agent placed at the rearward position can, together with the rear leg elastic member, suppress the initial surface flow of menstrual blood and allow the menstrual blood to slide onto the absorbent core. Furthermore, when the elastic member placement area reaches a position further back than the rear leg elastic member, the rear leg elastic member can prevent the absorbent core from excessively entering the wearer's gluteal cleft, ensuring the length of the absorbent core in the width direction and suppressing leakage.

[0294] In the panty-type sanitary napkin of this disclosure, in its unfolded state and within the area overlapping the absorbent core in the thickness direction, the liquid-impermeable sheet and / or the outer casing may have colored portions in a range closer to the front end and / or closer to the rear end than the area where the oily agent is applied. Therefore, in the ranges closer to the front end and the rear end, menstrual blood absorbed by the absorbent core can be concealed to a certain extent, reducing the wearer's anxiety about the possibility of menstrual blood leaking from the front or back of the panty-type sanitary napkin. For example, a printed portion can be cited as a colored portion.

[0295] In the panty-type sanitary napkin of this disclosure, in the unfolded state, the aforementioned liquid-impermeable sheet and the aforementioned outer casing do not have colored portions in the area overlapping with the area where the oily agent is applied. Therefore, the wearer can easily visually confirm from the outside of the panty-type sanitary napkin that the absorbent core has absorbed menstrual blood, giving the wearer the impression that the panty-type sanitary napkin reliably absorbs menstrual blood and is leak-proof.

[0296] The aforementioned panty-style sanitary napkins may not contain volatile cooling agents. Therefore, it is easier to prevent oily agents from causing menstrual blood to slide onto the absorbent core, resulting in excellent absorbency. Furthermore, it can inhibit the irritation of the physiologically sensitive area around the clitoris by volatile cooling agents.

[0297] The vapor pressure of the aforementioned volatile cooling agent is preferably 0.1 Pa or more at 20°C, more preferably 1.0 Pa or more, even more preferably 10 Pa or more, and even more preferably 100 Pa or more.

[0298] In this disclosure, the aforementioned oily agent has the same effect as the blood lubricant described in Patent Document 2, and has the effect of causing menstrual blood to slide from the skin side sheet, preferably from the top sheet, onto the absorbent core.

[0299] The above-mentioned oily agent has a preferred thickness of 0.01 to 80 mm at 40°C. 2 / s, more preferably 1 to 70 mm 2 / s, further preferably 3-60mm 2 / s, more preferably 5-50mm 2 The kinematic viscosity is further preferably 7–45 mm / s. 2 kinematic viscosity / s.

[0300] In addition, the oil-based agent is designed to achieve a thickness of 0.01–80 mm at 40°C. 2 The kinematic viscosity is approximately 1 / s, and the melting point of the oily agent is preferably below 45°C. This is because if the oily agent contains crystals at 40°C, its kinematic viscosity tends to increase.

[0301] It should be noted that in this specification, the kinematic viscosity at 40°C is sometimes referred to simply as "kinematic viscosity".

[0302] If the above kinematic viscosity exceeds 80 mm 2 / s indicates that the oily agent has high viscosity and tends to be difficult to slide down from the skin side sheet along with menstrual blood, preferably from the top sheet to the absorbent core.

[0303] The kinematic viscosity described above can be measured using a Cannon-Fenske countercurrent viscometer at a test temperature of 40°C, according to "5. Test method for kinematic viscosity" in JIS K 2283:2000.

[0304] The aforementioned oily agent preferably has a water retention rate 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 still more preferably 0.05 to 2.0% by mass.

[0305] In this specification, "water retention rate" refers to the percentage of water that a substance can retain, which can be determined as follows.

[0306] (1) In a constant temperature room at 40℃, the test tube, rubber stopper, substance to be tested and deionized water were left to stand for 24 hours.

[0307] (2) In the above constant temperature room, add 5.0g of the substance to be tested and 5.0g of deionized water to a 20mL test tube.

[0308] (3) In the above constant temperature room, plug the mouth of the test tube with a rubber stopper, rotate it once, and let it stand for 5 minutes.

[0309] (4) In the above constant temperature room, 3.0g of the layer (usually the upper layer) of the substance to be tested is collected into a glass petri dish (mass: W0) with a diameter of 90mm.

[0310] (5) Heat the above petri dishes in an oven at 105°C for 3 hours to evaporate the moisture, and measure the mass (mass: W1) together with the petri dishes.

[0311] (6) Calculate the water retention rate according to the following formula.

[0312] Water retention rate (mass%) = 100 × (W0 - W1) / 3.0

[0313] The measurement was performed three times, and the average value was used.

[0314] The aforementioned oily agent preferably has a weight-average molecular weight of less than 1000, and more preferably a weight-average molecular weight of less than 900. This is because if the weight-average molecular weight is 1000 or higher, the oily agent itself will become sticky, which tends to cause discomfort to the wearer.

[0315] The aforementioned oily agent preferably has a weight-average molecular weight of 100 or more, and more preferably a weight-average molecular weight of 200 or more. This is because if the weight-average molecular weight decreases, the vapor pressure of the oily agent increases, and it may sometimes vaporize during storage, resulting in problems such as reduced quantity and odor when worn.

[0316] It should be noted that, in this specification, "weight-average molecular weight" is a concept encompassing both polydisperse compounds (e.g., compounds manufactured by stepwise polymerization, esters formed from multiple fatty acids and multiple aliphatic monohydric alcohols) and single compounds (e.g., esters formed from one fatty acid and one aliphatic monohydric alcohol), in the context of N... i Molecular weight M i In a system composed of molecules (i = 1, or i = 1, 2...), it refers to the system defined by the following formula:

[0317] M w =ΣN i M i 2 / ΣN i M i

[0318] The calculated M w .

[0319] In this specification, weight-average molecular weight refers to the value of polystyrene obtained by gel permeation chromatography (GPC).

[0320] Examples of conditions for GPC determination include the following.

[0321] Model: (Hitachi High Technology Co., Ltd.) High Performance Liquid Chromatograph Lachrom Elite

[0322] Chromatographic columns: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko Co., Ltd.

[0323] Elution buffer: THF

[0324] Flow rate: 1.0 mL / min

[0325] Injection volume: 100μL

[0326] Testing: RI (Differential Refractometer)

[0327] Examples of components of the aforementioned oily agents include (a1) an ester of a chain tetraol and at least one fatty acid, (a2) an ester of a chain triol and at least one fatty acid, (a3) ​​an ester of a chain diol and at least one fatty acid, (b1) an ether of a chain tetraol and at least one aliphatic monohydric alcohol, (b2) an ether of a chain triol and at least one aliphatic monohydric alcohol, (b3) an ether of a chain diol and at least one aliphatic monohydric alcohol, (c1) an ester of a chain tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxyacid having four carboxyl groups and at least one aliphatic monohydric alcohol, and (c2) an ester of a chain tricarboxylic acid, hydroxy acid, alkoxy acid, or oxyacid having three carboxyl groups. Esters of acids, alkoxy acids or oxyacids with at least one aliphatic monohydric alcohol, (c3) chain hydrocarbons having two carboxyl groups, dicarboxylic acids, hydroxy acids, alkoxy acids or oxyacids with at least one aliphatic monohydric alcohol, (d1) aliphatic monohydric alcohols with ethers of aliphatic monohydric alcohols, (d2) dialkyl ketones, (d3) fatty acids with esters of aliphatic monohydric alcohols, (d4) dialkyl carbonate esters, (e1) polyoxy C3-C6 alkylene glycols, (e2) polyoxy C3-C6 alkylene glycols with at least one fatty acid, (e3) polyoxy C3-C6 alkylene glycols with ethers of at least one aliphatic monohydric alcohol, and (f1) chain alkanes.

[0328] [(a1) Ester of a chain-like hydrocarbon tetraol with at least one fatty acid]

[0329] Examples of (a1) chain esters of alkyl esters and at least one fatty acid include tetraesters of pentaerythritol and fatty acid, triesters of pentaerythritol and fatty acid, diesters of pentaerythritol and fatty acid, and monoesters of pentaerythritol and fatty acid.

[0330] Examples of the aforementioned fatty acids include saturated fatty acids, such as C2-C4 fatty acids. 30 Saturated fatty acids, such as acetic acid (C2) (C2 represents the number of carbon atoms, the same below), propionic acid (C3), butyric acid (C4) and their isomers, such as 2-methylpropionic acid (C4), valeric acid (C5) and its isomers, such as 2-methylbutyric acid (C5), 2,2-dimethylpropionic 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 (C9), etc. 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 ), cocoacid (C 22 ), coesanoic acid (C 24 ), hexacosanoic acid (C 26 ), octacosanoic acid (C28 ), triacono-2-carboxylic acid (C 30 (etc.) and their isomers not listed.

[0331] The aforementioned fatty acids can also be unsaturated fatty acids. Examples of such unsaturated fatty acids include C3-C6 fatty acids. 20 Unsaturated fatty acids, such as monounsaturated fatty acids, such as crotonic acid (C4) and myristone acid (C4). 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), oleic acid (C 18 ), isoleic acid (C 18 ), codoleic acid (C 20 ), eicosenoic acid (C 20 Diunsaturated fatty acids, such as linoleic acid (C60-240-3 ... 18 ), eicosadienoic acid (C 20 Triunsaturated fatty acids, such as linolenic acid, such as alpha-linolenic acid (C...), etc. 18 ) and γ-linolenic acid (C 18 ), pine oil (C 18 ), tung oil acid, for example α-tung oil acid (C 18 ) and β-tung oil (C 18 ), Meadic acid (C 20 ), dihypo-γ-linolenic acid (C 20 ), eicosatrienoic acid (C 20 Tetraunsaturated fatty acids, such as octadecanoic acid (C40-24-3 ... 20 ), Arachidonic acid (C 20 ), eicosatraenoic acid (C 20 ) and other pentaunsaturated fatty acids, such as octadecanoic acid (C60-21-32 ... 18 ), eicosapentaenoic acid (C 20 ) and some of their hydrogenated derivatives.

[0332] As for the above-mentioned pentaerythritol and fatty acid esters, considering the possibility of modification due to oxidation, etc., pentaerythritol and fatty acid esters derived from saturated fatty acids are preferred, that is, pentaerythritol and saturated fatty acid esters.

[0333] Furthermore, from the viewpoint of reducing the water retention rate, diester, triester, or tetraester is preferred as the ester of the aforementioned pentaerythritol and fatty acid, more preferably triester or tetraester, and even more preferably tetraester.

[0334] Commercially available products that are esters of the aforementioned pentaerythritol and fatty acids include UNISTAR H-408BRS and H-2408BRS-22 (mixed products) (all manufactured by Nippon Oil Co., Ltd.).

[0335] [(a2) Ester of a chain triol with at least one fatty acid]

[0336] Examples of (a2) chain triols and at least one fatty acid esters include triesters of glycerol and fatty acids, diesters of glycerol and fatty acids, and monoesters of glycerol and fatty acids.

[0337] The fatty acids mentioned above are as described above.

[0338] From the viewpoint of reducing the water retention rate, diesters or triesters are preferred as esters of the aforementioned glycerol and fatty acids, and triesters are more preferred.

[0339] Examples of triesters of glycerol with two or more fatty acids include glycerol with caprylic acid (C8) and capric acid (C8). 10 Triglycerides, glycerols, caprylic acid (C8), and decanoic acid (C8) 10 ) and dodecanoic acid (C 12 Triglycerides, glycerols, caprylic acid (C8), and decanoic acid (C8) 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ) and octadecanoic acid (C 18 Triesters, etc.

[0340] From the viewpoint of having a melting point of 45°C or below, the triester of glycerol and fatty acids preferably has a total number of carbon atoms in the fatty acids constituting the triester of glycerol and fatty acids of about 40 or less.

[0341] Commercially available products containing the aforementioned triglycerides of glycerol and fatty acids include triglycerides of coconut oil, NA36, PANACET800, PANACET800B and PANACET810S, triglycerides of C2L oil and triglycerides of CL oil (all manufactured by Nippon Oil Co., Ltd.), olive oil, etc.

[0342] [(a3) Ester of a chain-like hydrocarbon diol with at least one fatty acid]

[0343] As an ester of (a3) ​​a chain diol with at least one fatty acid, examples include C2-C6 chain diols, such as C2-C6 diols, such as ethylene glycol, propylene glycol, butanediol, pentanediol or hexanediol with fatty acid monoesters or diesters.

[0344] Examples of the aforementioned fatty acids include those listed in "(a1) esters of chain-like hydrocarbon tetraols and at least one fatty acid".

[0345] As for the esters of C2-C6 diols and fatty acids mentioned above, considering the possibility of modification due to oxidation, etc., esters of C2-C6 diols and fatty acids derived from saturated fatty acids are preferred, that is, esters of C2-C6 diols and saturated fatty acids.

[0346] Furthermore, from the viewpoint of reducing the water retention rate, esters of diols and fatty acids derived from diols with a large number of carbon atoms are preferred as C2-C6 diols and fatty acids, such as esters of diols and fatty acids derived from butanediol, pentanediol, or hexanediol.

[0347] Furthermore, from the viewpoint of reducing the water retention rate, diesters are preferred as esters of the aforementioned C2-C6 diols and fatty acids.

[0348] Commercially available products that are esters of the aforementioned C2-C6 diols and fatty acids include, for example, COMPOL BL and COMPOLBS (both manufactured by Nippon Oil Co., Ltd.).

[0349] [(b1) Ethers of chain-like hydrocarbon tetraols and at least one aliphatic monohydric alcohol]

[0350] Examples of (b1) ethers of a chain-like hydrocarbon tetraol and at least one aliphatic monohydric alcohol include tetraethers, triethers, diethers, and monoethers of pentaerythritol and aliphatic monohydric alcohol.

[0351] Examples of aliphatic monohydric alcohols include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols.

[0352] Examples of saturated aliphatic monohydric alcohols mentioned above include C1 to C2. 20 Saturated aliphatic monohydric alcohols, such as methanol (C1) (C1 represents the number of carbon atoms, the same below), ethanol (C2), propanol (C3) and its isomers, such as isopropanol (C3), butanol (C4) and its isomers, such as sec-butanol (C4) and tert-butanol (C4), pentanol (C5), hexanol (C6), heptanol (C7), octanol (C8) and its isomers, such as 2-ethylhexanol (C8), nonanol (C9), decanol (C1), and so on. 10 ), dodecyl alcohol (C 12 ), tetradecyl alcohol (C 14 ), hexadecyl alcohol (C 16 ), heptadecanol (C 17 ), octadecyl alcohol (C 18 ) and eicosanol (C 20 ), and their unlisted isomers.

[0353] As an example of the aforementioned unsaturated aliphatic monohydric alcohols, alcohols obtained by replacing one of the C=C single bonds in the aforementioned saturated aliphatic monohydric alcohols with a C=C double bond, such as oleyl alcohols, are marketed by Shin Nippon Rika Co., Ltd. under the names RIKACOL series and UNJECOL series.

[0354] [(b2) Ethers of chain triols and at least one aliphatic monohydric alcohol]

[0355] (b2) Ethers of chain trihydric alcohols and at least one aliphatic monohydric alcohol, for example, triethers, diethers and monoethers of glycerol and aliphatic monohydric alcohols.

[0356] The aforementioned aliphatic monohydric alcohols are as described above.

[0357] [(b3) Ethers of chain-like hydrocarbon diols and at least one aliphatic monohydric alcohol]

[0358] Examples of (b3) ethers of chain diols and at least one aliphatic monohydric alcohol include diethers of C2-C6 diols and aliphatic monohydric alcohols, and monoethers of C2-C6 diols and aliphatic monohydric alcohols.

[0359] The aforementioned aliphatic monohydric alcohols are as described above.

[0360] [(c1) An ester of a chain hydrocarbon having four carboxyl groups, a tetracarboxylic acid, a hydroxy acid, an alkoxy acid, or an oxyacid with at least one aliphatic monohydric alcohol]

[0361] As (c1) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having four carboxyl groups and at least one aliphatic monohydric alcohol, examples include monoesters, diesters, trimers and tetraesters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having four carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters, trimers and tetraesters, more preferably trimers and tetraesters, and even more preferably tetraesters.

[0362] Examples of the aforementioned chain-like tetracarboxylic acids include alkane tetracarboxylic acids, such as butane tetracarboxylic acid, pentane tetracarboxylic acid, hexane tetracarboxylic acid, heptane tetracarboxylic acid, octane tetracarboxylic acid, nonane tetracarboxylic acid, and decane tetracarboxylic acid.

[0363] The aforementioned aliphatic monohydric alcohols are as described above.

[0364] [(c2) An ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxyacid with at least one aliphatic monohydric alcohol]

[0365] As (c2), an ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having three carboxyl groups and at least one aliphatic monohydric alcohol, examples include monoesters, diesters and tripesters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having three carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters and tripesters, more preferably tripesters.

[0366] Examples of the aforementioned chain-like hydrocarbon tricarboxylic acids include alkane tricarboxylic acids, such as propane tricarboxylic acid, butane tricarboxylic acid, pentane tricarboxylic acid, hexane tricarboxylic acid, heptane tricarboxylic acid, octane tricarboxylic acid, nonane tricarboxylic acid, and decane tricarboxylic acid.

[0367] The aforementioned aliphatic monohydric alcohols are as described above.

[0368] As an example, O-acetylthiocitrate tributyl ester can be cited, and it is available on the market.

[0369] [(c3) An ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxyacid with two carboxyl groups and at least one aliphatic monohydric alcohol]

[0370] As (c3) an ester of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having two carboxyl groups and at least one aliphatic monohydric alcohol, examples include monoesters and diesters of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxyacid having two carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters.

[0371] Examples of the aforementioned chain-like hydrocarbon dicarboxylic acids 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.

[0372] Regarding the aforementioned aliphatic monohydric alcohols, as described above.

[0373] As an example, dioctyl adipate, which is available on the market, can be cited.

[0374] [(d1) Aliphatic monohydric alcohols and their ethers]

[0375] Examples of aliphatic monohydric alcohols and their ethers include those having the following formula (1):

[0376] R 1 OR 2 (1)

[0377] (where R is in the formula) 1 and R 2 (These are chain hydrocarbons)

[0378] Compounds.

[0379] The aliphatic monohydric alcohol constituting the above ether (in formula (1), equivalent to R)1 OH and R 2 OH), as described above.

[0380] [(d2)dialkyl ketone]

[0381] As the aforementioned dialkyl ketone, examples can be given of those having the following formula (2):

[0382] R 3 COR 4 (2)

[0383] (where R is in the formula) 3 and R 4 (Alkyl groups respectively)

[0384] Compounds.

[0385] In addition to being sold on the market, the aforementioned dialkyl ketones can also be obtained by known methods, such as oxidizing secondary alcohols with chromic acid.

[0386] [(d3) esters of fatty acids and aliphatic monohydric alcohols]

[0387] Examples of esters of the aforementioned fatty acids and aliphatic monohydric alcohols include those having the following formula (3):

[0388] R 5 COOR 6 (3)

[0389] (where R is in the formula) 5 and R 6 (These are chain hydrocarbons)

[0390] Compounds.

[0391] The fatty acids that constitute the above esters (in formula (3), are equivalent to R) 5 Examples of fatty acids include COOH, and saturated fatty acids are preferred considering the possibility of modification due to oxidation, etc. The aliphatic monohydric alcohol constituting the above ester (in formula (3), R) is equivalent to... 6 OH), for example, the aforementioned aliphatic monohydric alcohols.

[0392] Examples of esters of the aforementioned fatty acids and aliphatic monohydric alcohols include, for instance, dodecanoic acid (C... 12 ) and dodecyl alcohol (C 12 ) esters, tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 Esters of fatty acids and aliphatic monohydric alcohols, such as ELECTOL WE20 and ELECTOL WE40 (both manufactured by Nippon Oil Co., Ltd.), are commercially available products.

[0393] [(d4)dialkyl carbonate]

[0394] As the aforementioned dialkyl carbonate, examples with the following formula (4) can be cited:

[0395] R 7 OC(=O)OR 8 (4)

[0396] (where R is in the formula) 7 and R 8 (Alkyl groups respectively)

[0397] Compounds.

[0398] In addition to being commercially available, the aforementioned dialkyl carbonates can also be synthesized through the reaction of carbonyl chloride with alcohols, the reaction of chloroformates with alcohols or alcohol derivatives, and the reaction of silver carbonate with alkyl iodides.

[0399] [(e1) Polyoxy C3-C6 alkylene glycols]

[0400] The aforementioned polyoxy C3-C6 alkylene glycols refer to: i) homopolymers having any one of the following skeletons selected from the group consisting of oxy-C3-C6 alkylene skeletons, namely oxy-propylene skeletons, oxy-butylene skeletons, oxy-pentylene skeletons, and oxy-hexylene skeletons, and having hydroxyl groups at both ends; ii) block copolymers having two or more skeletons selected from the above group and having hydroxyl groups at both ends; or iii) random copolymers having two or more skeletons selected from the above group and having hydroxyl groups at both ends.

[0401] Commercially available products of the aforementioned poly(C3-C6) alkylene glycols include, for example, UNIOL (trademark) PB-500 and PB-700 (both manufactured by Nippon Oil Co., Ltd.).

[0402] [(e2) Ester of polyoxy C3-C6 alkylene glycols with at least one fatty acid]

[0403] Examples of esters of the aforementioned polyoxy C3-C6 alkylene glycols and at least one fatty acid include esters, monoesters, and diesters of polyoxy C3-C6 alkylene glycols whose OH ends are esterified with fatty acids, as described in the section “(e1) polyoxy C3-C6 alkylene glycols”.

[0404] Regarding the fatty acids mentioned above, as stated above.

[0405] [(e3) Ethers of polyoxy C3-C6 alkylene glycols and at least one aliphatic monohydric alcohol]

[0406] Examples of ethers of the aforementioned polyoxy C3-C6 alkylene glycols and at least one aliphatic monohydric alcohol include ethers, i.e., monoethers and diethers, in which one or both of the OH ends of the polyoxy C3-C6 alkylene glycols described in the section “(e1) polyoxy C3-C6 alkylene glycols” are etherified with an aliphatic monohydric alcohol.

[0407] Regarding the aforementioned aliphatic monohydric alcohols, as described above.

[0408] [(f1) chain alkanes]

[0409] Examples of (f1) chain alkanes include straight-chain alkanes and branched-chain alkanes.

[0410] For example, PARLEAM6 (Nippon Yusen Co., Ltd.) is a commercially available product of the aforementioned hydrocarbons.

Claims

1. A shorts-type sanitary napkin, comprising an absorbent body and an outer casing, wherein the absorbent body has a length direction and a width direction, characterized in that, The panty-style sanitary napkin, when unfolded, has mutually orthogonal length, width, and thickness directions, and is divided into a ventral region located at a position slightly forward of the center of the length direction and a dorsal region located slightly backward of the center of the length direction. The absorbent body comprises an absorbent core, a skin-permeable 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 and composed of a moisture-permeable membrane. The absorbent body has an oil-based agent preparation area on the skin side panel or the absorbent core. The shorts-type sanitary napkin includes a hydrophobic nonwoven fabric sheet, which is present in the oily agent preparation area when viewed from above in the unfolded state, and is disposed on the non-skin side of the liquid-impermeable sheet.

2. The shorts-type sanitary napkin as described in claim 1, characterized in that, The hydrophobic nonwoven sheet is disposed adjacent to the non-skin side of the liquid-impermeable sheet.

3. The shorts-type sanitary napkin as described in claim 2, characterized in that, In the oily agent preparation area viewed from above in the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven interfacing portions in the length direction and / or the width direction.

4. The panty-type sanitary napkin as described in any one of claims 1 to 3, characterized in that, 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 panty-type sanitary napkin as described in claim 4, characterized in that, The liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined together by a membrane nonwoven inlay. The hydrophobic nonwoven sheet also has a low-density layer disposed adjacent to the high-density layer on the skin side and having a lower density than the high-density layer.

6. The panty-type sanitary napkin as described in claim 1, characterized in that, The hydrophobic nonwoven fabric sheet has a plurality of embossed portions, at least a portion of which is recessed inward.

7. The panty-type sanitary napkin as described in claim 1, characterized in that, The shorts-type sanitary napkin has an additional hydrophobic nonwoven fabric sheet, which is present in the oily agent preparation area when viewed from above in the unfolded state, and is disposed adjacent to the hydrophobic nonwoven fabric sheet on the non-skin side.

8. The panty-type sanitary napkin as described in claim 7, characterized in that, In the area of ​​the oily agent preparation when viewed from above in the unfolded state, the hydrophobic nonwoven sheet and the additional hydrophobic nonwoven sheet are joined by nonwoven interlocking portions that are intermittently arranged in the length direction and / or the width direction.

9. The shorts-type sanitary napkin as described in claim 8, characterized in that, In the unfolded state, the liquid-impermeable sheet and the hydrophobic nonwoven sheet are joined by intermittently arranged membrane nonwoven interfacing portions in the length direction and / or the width direction, the membrane nonwoven interfacing portions and the nonwoven interfacing portions having non-overlapping joint portions that do not overlap with each other in the thickness direction.

10. The panty-type sanitary napkin as described in any one of claims 7 to 9, characterized in that, The shorts-type sanitary napkin, when viewed from above in its unfolded state, includes the hydrophobic nonwoven fabric sheet and the additional hydrophobic nonwoven fabric sheet in the back area.

11. The panty-type sanitary napkin as described in claim 1, characterized in that, The absorbent body further comprises a core-coating layer that covers the absorbent core from the side of the impermeable sheet. In the oily agent placement area when viewed from above in the unfolded state, the core-coating layer and the impermeable sheet are joined by core-coating layer joints that are intermittently arranged in the length direction and / or the width direction.

12. The panty-type sanitary napkin as described in claim 1, characterized in that, Between the absorbent core and the impermeable sheet, there is also a sheet with oil-absorbing or oil-retaining properties.

13. The panty-type sanitary napkin as described in claim 1, characterized in that, The panty-style sanitary napkin has an elastic component disposed on the non-skin side of the absorbent core and arranged along the length direction from the abdominal region to the dorsal region. In the unfolded state, the oily agent application area and the elastic component overlap in the thickness direction.

14. The panty-type sanitary napkin as described in claim 13, characterized in that, In the unfolded state and viewed from above along the length, the oily agent configuration area is disposed inside the elastic component configuration area.

15. The panty-type sanitary napkin as described in claim 1, characterized in that, In the ventral region, the outer body has multiple sheet regions composed of multiple sheets arranged near the front end and a single sheet region composed of a single sheet arranged near the rear end. In the unfolded state, the oily agent placement area in the ventral region overlaps with the single sheet region in the thickness direction but does not overlap with the multiple sheet regions in the thickness direction.

16. The panty-type sanitary napkin as described in claim 1, characterized in that, In the back side region, the outer body has a single sheet region composed of a single sheet disposed at the front end and a plurality of sheet regions composed of a plurality of sheets disposed at the rear end. In the unfolded state, the oily agent disposal region in the back side region overlaps with the single sheet region and the plurality of sheet regions in the thickness direction.

17. The panty-type sanitary napkin as described in claim 1, characterized in that, In the unfolded state and within the range overlapping the absorbent core in the thickness direction, the impermeable sheet or the outer casing has a colored portion in the range of the front end or the rear end of the region relative to the oily agent preparation area.

18. The panty-type sanitary napkin as described in claim 17, characterized in that, When viewed from above in the thickness direction in the unfolded state, the impermeable sheet and the outer casing do not have colored portions within the area overlapping with the oily agent application area.

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