Panty-type sanitary napkin

Abstract

A pair of first imaginary lines respectively pass through both ends in the left-right direction of a portion of the absorbent core (11) overlapping with the back waist portion (30) and extend in the length direction, a second imaginary line passes through the upper end of the absorbent core (11) and extends in the left-right direction, and a third imaginary line bisects between the central position in the length direction of the panty-type sanitary napkin (1) and the lower end of the side joint and extends in the left-right direction. When the rectangular region is divided into five equal parts, the weight per unit area of the adhesive is lower in a region adjacent to an end region on the inner side in the left-right direction than in an end region on the outermost side in the left-right direction. The back waist portion (30) has elastic members (33, 35) that are continuous in the left-right direction and stretch in the left-right direction at least in the rectangular region.

Description

Technical Field

[0001] This utility model relates to a shorts-shaped sanitary napkin. Background Technology

[0002] Patent Document 1 discloses a disposable underwear-type diaper, which includes an absorbent body and an outer body. The absorbent body has an absorbent core and a patterned backing sheet. In Patent Document 1, to achieve a soft feel and ensure the pattern is clearly visible, the absorbent body is bonded to the outer body at the patterned areas on the abdominal and dorsal sides. Furthermore, the adhesive has a lower weight per unit area at the central portion of the absorbent body in the width direction in the crotch area.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2005-103178 Utility Model Content

[0006] Problems to be solved by utility models

[0007] In the disposable diaper illustrated in Patent Document 1, there is a space on the back to collect feces and a space to store urine before it is absorbed by the absorbent core. In contrast, the primary purpose of panty-type sanitary napkins is to absorb menstrual blood. Compared to urine, menstrual blood has a higher viscosity, therefore, it tends to flow down the body (the crease of the buttocks) and spreads easily on the surface, resulting in less leakage. Therefore, panty-type sanitary napkins aim to ensure that the absorbent core (absorbent body) fits snugly against the crease of the wearer's buttocks to suppress leakage.

[0008] However, in the disposable diaper of Patent Document 1, as already described, the absorbent body is adhered to the outer body in a way that it is tightly attached to the outer body in the patterned area. Therefore, if the pattern is provided on the back side that is in contact with the groove of the wearer's buttocks, the rigidity is increased due to the adhesive, making it difficult to deform, and the absorbent body is difficult to deform in a way that it is tightly attached to the groove of the wearer's buttocks.

[0009] Furthermore, in the disposable diaper of Patent Document 1, the elastic member that stretches in the width direction around the waist does not exhibit elastic stretching at the point where it overlaps with the absorbent. Therefore, in the waist area where the absorbent rests against the groove of the wearer's buttocks, the absorbent is not affected by the elastic member and easily remains flat. Consequently, the absorbent is difficult to deform in a way that tightly conforms to the groove of the wearer's buttocks.

[0010] This invention was made in view of the aforementioned problems, and its purpose is to provide a panty-type sanitary napkin with an absorbent core that easily fits snugly against the cleft of the wearer's buttocks to suppress the flow and leakage of menstrual blood.

[0011] means for solving problems

[0012] The main technical solution for achieving the above objectives is a panty-shaped sanitary napkin, which has an absorbent body, an abdominal waist section, and a back waist section. The absorbent body has an absorbent core. The abdominal waist section and the back waist section are joined into a ring shape by a pair of lateral joints. The panty-shaped sanitary napkin, in its unfolded and extended state, has mutually orthogonal length, left-right, and thickness directions. It has a rectangular area divided by a pair of first, second, and third imaginary lines. The first imaginary lines pass through the two ends of the portion of the absorbent core that overlaps with the back waist section in the thickness direction in the left-right direction and extend along the length direction. The second imaginary line passes through the portion of the absorbent core that overlaps with the back waist section in the thickness direction. The third imaginary line bisects the length direction of the portion overlapping in the thickness direction at one end near the waist and extends along the left-right direction. It also bisects the length direction between the central position of the panty-type sanitary napkin and the crotch-side end of the back portion of the side joint in the length direction and extends along the left-right direction. When the rectangular area is divided into five equal parts in the left-right direction, the adhesive unit area weight of the adhesive that bonds the back waist portion to the absorbent body is lower in the area adjacent to the inner side of the end portion in the left-right direction compared to the outermost end portion in the left-right direction. The back waist portion has an elastic member that is continuous and stretchable in the left-right direction at least in the rectangular area.

[0013] Other features of this utility model will become clear from the description in this specification and the accompanying drawings.

[0014] Effects of the utility model

[0015] According to this invention, a panty-style sanitary napkin is provided, in which the absorbent core easily conforms to the groove of the wearer's buttocks to suppress the flow and leakage of menstrual blood. Attached Figure Description

[0016] Figure 1 This is a front view of the panty-style sanitary napkin 1 viewed from the ventral side.

[0017] Figure 2 This is a rear view of the shorts-type sanitary napkin 1 viewed from the back.

[0018] Figure 3This is a top view of a panty-shaped sanitary napkin 1 in its unfolded and stretched state, viewed from the skin side.

[0019] Figure 4 of Figure 4 A is Figure 3 A schematic cross-sectional view at the first centerline CL1. Figure 4 B is Figure 3 A schematic cross-sectional view at the second center line CL2.

[0020] Figure 5 of Figure 5 A is an explanatory diagram of the bonding area 10R located in the absorbent body 10. Figure 5 B is an explanatory diagram of the bonding area 20R located at the waist and body sections 20 and 30.

[0021] Figure 6 This is an explanatory diagram of the adhesive area 1R located on the sanitary napkin 1.

[0022] Figure 7 of Figure 7 A and Figure 7 B is an explanatory diagram of the first rectangular region Ra.

[0023] Figure 8 of Figure 8 A and Figure 8 B is an explanatory diagram of the second rectangular region Rb and the third rectangular region Rc.

[0024] Figure 9 of Figure 9 A and Figure 9 B is an explanatory diagram of a modified example of the adhesive region 1R.

[0025] Figure 10 of Figure 10 A and Figure 10 B is an explanatory diagram of a modified example of the adhesive region 1R.

[0026] Figure 11 of Figure 11 A and Figure 11 B is an explanatory diagram of the 4th rectangular region Rd and the 5th rectangular region Re.

[0027] Figure 12 of Figure 12 A and Figure 12 B is an explanatory diagram of the 6th rectangular region Rf.

[0028] Figure 13 of Figure 13 A and Figure 13 B is an explanatory diagram of the bonding area 1R in the second embodiment. Detailed Implementation

[0029] Based on the description in this specification and the accompanying drawings, at least the following matters are made clear.

[0030] (Technical Solution 1)

[0031] A shorts-type sanitary napkin has an absorbent body, a ventral waist section, and a dorsal waist section. The absorbent body has an absorbent core. The ventral waist section and the dorsal waist section are joined into a ring shape by a pair of lateral joints. The shorts-type sanitary napkin, in its unfolded and extended state, has mutually orthogonal length, left-right, and thickness directions. The shorts-type sanitary napkin has a rectangular area defined by a pair of first, second, and third imaginary lines. The pair of first imaginary lines pass through the two ends of the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction in the left-right direction and extend along the length direction. The pair of second imaginary lines pass through the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction... The third imaginary line bisects the length of the central position of the panty-type sanitary napkin and the crotch-side end of the back portion of the side joint in the length direction and extends in the left and right directions. When the rectangular area is divided into five equal parts in the left and right directions, the adhesive unit area weight of the adhesive that bonds the back waist portion to the absorbent body is lower in the area adjacent to the inner side of the end portion in the left and right directions compared to the outermost end portion in the left and right directions. The back waist portion has an elastic member that is continuous and stretchable in the left and right directions at least in the rectangular area.

[0032] According to technical solution 1, in the rectangular area that abuts against the groove of the wearer's buttocks, the inner area adjacent to the end areas in the left-right direction of the absorbent core has lower stiffness and is more prone to deformation compared to the end areas corresponding to the two sides in the left-right direction. Therefore, the adjacent area becomes the starting point of bending, making it easy for the central part of the absorbent core in the left-right direction to deform convexly in a way that fits snugly against the groove of the buttocks. Furthermore, even when the absorbent core is about to contract in the left-right direction using the elastic members within the rectangular area, it is less likely to form disorderly wrinkles. The adjacent area with lower stiffness deforms easily, promoting the convex deformation of the absorbent core, and it is also easier to maintain the absorbent core's close fit against the groove of the buttocks during wear. Therefore, it is possible to suppress the leakage of menstrual blood, etc.

[0033] (Technical Solution 2)

[0034] According to technical solution 1, the shorts-type sanitary napkin is characterized in that the back waist part is composed of separate components relative to the abdominal waist part.

[0035] According to technical solution 2, unlike a continuous one-piece outer component extending from the back waist to the abdominal waist, it prevents the wearer's groin movements (such as opening and closing the legs) from being transmitted to the back waist via the outer component. Therefore, it is easier to maintain the absorbent core in close contact with the buttocks. Furthermore, when lifting to put on the sanitary napkin, the force is easily concentrated at the adhesive portion between the absorbent body and the back waist, pressing the absorbent core against the buttocks and ensuring a close fit with the buttocks.

[0036] (Technical Solution 3)

[0037] According to technical solution 2, the shorts-type sanitary napkin is characterized in that, in its unfolded and stretched state, the shorts-type sanitary napkin has a second rectangular region divided by the pair of first, fourth, and fifth imaginary lines. The fourth imaginary line passes through the lower crotch side end of the back portion of the lateral joint and extends along the left-right direction. The fifth imaginary line passes through the lower crotch side end of the back waist portion and extends along the left-right direction. When the second rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower unit area weight in the region adjacent to the inner side of the second end portion in the left-right direction compared to the outermost second end portion in the left-right direction. The back waist portion has an elastic member that is continuous and stretchable in the left-right direction, at least in the second rectangular region.

[0038] According to technical solution 3, in the second rectangular region that abuts against the part of the buttocks that deepens from the beginning, the adjacent region on the inner side of the second end region has lower stiffness and is more likely to become a bending starting point. Therefore, the absorbent core is easily deformed into a convex shape so as to fit tightly against the part of the buttocks that deepens from the beginning. In addition, the elastic member in the second rectangular region promotes the convex deformation of the absorbent core and easily maintains the absorbent core in close contact with the buttocks during wear.

[0039] (Technical Solution 4)

[0040] According to any one of technical solutions 1 to 3, the shorts-type sanitary napkin is characterized in that, when the rectangular area is divided into five equal parts in the left-right direction, the three areas that are closer to the inside of the left-right direction than the end area have non-adhesive areas without adhesive.

[0041] According to technical solution 4, the non-adhesive areas have lower stiffness compared to the adhesive areas. Therefore, by having non-adhesive areas on the inner side, the lower stiffness of the three areas allows the absorbent core to easily follow the shape of the wearer's buttocks and surrounding area. Consequently, gaps are less likely to form between the panty-style sanitary napkin and the wearer, thus suppressing back leakage of menstrual blood.

[0042] (Technical Solution 5)

[0043] According to any one of technical solutions 1 to 4, the shorts-type sanitary napkin is characterized in that, in its unfolded and extended state, the shorts-type sanitary napkin has a third rectangular region divided by the pair of first imaginary lines, the second imaginary line, and the fourth imaginary line, the fourth imaginary line passing through the lower crotch end of the back portion of the lateral joint and extending along the left-right direction, when the third rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower unit area weight in the region adjacent to the inner side of the third end region in the left-right direction compared to the outermost third end region in the left-right direction, and the back waist portion has an elastic member that is continuous and stretchable in the left-right direction at least in the third rectangular region.

[0044] According to technical solution 5, in the third rectangular region that abuts against the end of the groove of the buttocks, the adjacent region on the inner side of the third end region has lower stiffness and is more likely to become a bending starting point. Therefore, the absorbent core easily deforms into a convex shape in a way that it fits tightly against the end of the groove of the buttocks. In addition, the elastic member in the third rectangular region promotes the convex deformation of the absorbent core, and it is easy to maintain the state of the absorbent core fitting tightly against the groove of the buttocks during wear. Furthermore, since the region adjacent to the third end region has lower stiffness, the absorbent core can easily deform from a convex deformed state to a flat portion along the back side, which can reduce discomfort during wear.

[0045] (Technical Solution 6)

[0046] According to any one of technical solutions 1 to 5, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, at least one of the portion of the region adjacent to the end region when the rectangular region is divided into five equal parts in the left-right direction, which overlaps with the side joint in the length direction, and the portion closer to the crotch side than the side joint, has an adhesive region provided with the adhesive and a non-adhesive region without the adhesive, wherein the length of the non-adhesive region in the left-right direction is longer than the length of the adhesive region in the left-right direction.

[0047] According to technical solution 6, an adhesive region is provided in the region adjacent to the end region, and the length of the non-adhesive region in the lateral direction is made appropriately longer, so that the bending starting point can be easily defined. Therefore, the absorbent core can easily deform into a convex shape in a way that fits tightly against the groove of the buttocks.

[0048] (Technical Solution 7)

[0049] According to any one of technical solutions 1 to 5, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, at least one of the portion of the region adjacent to the end region when the rectangular region is divided into five equal parts in the left-right direction, which overlaps with the side joint in the length direction, and the portion closer to the crotch side than the side joint, has an adhesive region provided with the adhesive and a non-adhesive region without the adhesive, wherein the length of the non-adhesive region in the left-right direction is shorter than the length of the adhesive region in the left-right direction.

[0050] According to technical solution 7, in the area adjacent to the end area, the length of the adhesive area is made longer, thereby suppressing the friction generated by the respective movements of the absorbent body and the back side waist, and preventing the product from breaking.

[0051] (Technical Solution 8)

[0052] According to any one of technical solutions 1 to 5, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, at least one of the portion of the rectangular region adjacent to the end region in the length direction that overlaps with the side joint in the length direction and the portion closer to the crotch side than the side joint is a non-adhesive region without adhesive in the entire region when the rectangular region is divided into five equal parts in the left and right direction.

[0053] According to technical solution 8, in adjacent areas within the rectangular region, the entire region becomes a non-adhesive region. Thus, although the back and waist area is prone to contraction, the absorbent core is not linked to it and is difficult to contract. This contraction difference allows adjacent areas to be easily bent, enabling the absorbent core to easily deform into a convex shape, fitting snugly against the groove of the buttocks.

[0054] (Technical Solution 9)

[0055] According to any one of technical solutions 1 to 8, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, at least one of the portion of the central region in which the rectangular region is divided into five equal parts in the left-right direction, which overlaps with the side joint in the length direction, and the portion of the central region closer to the crotch side than the side joint, has an adhesive area provided with the adhesive and a non-adhesive area without the adhesive. The adhesive area overlaps with the central position of the central region in the left-right direction in the thickness direction, and the non-adhesive area is located on both outer sides of the adhesive area in the left-right direction.

[0056] According to technical solution 9, the adhesive area in the central region becomes the starting point for bending, making it easy for the absorbent core to fold convexly and easily fit into the groove of the wearer's buttocks. In addition, because there are non-adhesive areas with lower rigidity on both sides of the adhesive area, the absorbent core can easily follow the shape of the groove and surrounding area of ​​the buttocks, and is less likely to create gaps between the sanitary napkin and the wearer.

[0057] (Technical Solution 10)

[0058] According to any one of technical solutions 1 to 8, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, at least one of the portion of the central region in which the rectangular region is divided into five equal parts in the left-right direction, which overlaps with the side joint in the length direction, and the portion of the central region that is closer to the crotch side than the side joint, is a non-adhesive area without adhesive in the entire region.

[0059] According to technical solution 10, the rigidity of the central area is further reduced, making it more prone to deformation. Therefore, the absorbent core easily follows the shape of the buttocks groove and surrounding area, and is less likely to create gaps between the sanitary napkin and the wearer.

[0060] (Technical Solution 11)

[0061] According to any one of technical solutions 1 to 8, the shorts-type sanitary napkin is characterized in that, in the unfolded and stretched state, when the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion in the end region that overlaps with the side joint in the length direction and the portion in the central region that is closer to the crotch side than the side joint has an adhesive area provided with the adhesive, and the length in the left-right direction of the adhesive area of ​​the portion in the end region is longer than the length in the left-right direction of the adhesive area of ​​the portion in the central region.

[0062] According to technical solution 11, the adhesive area in the central region becomes the bending starting point, making it easy for the absorbent core to fold convexly and easily enter the groove of the wearer's buttocks. On the other hand, the adhesive area at the ends is wider, which allows the convex deformation portion of the absorbent core located on the inner side of the ends to be supported from below, making it easier to maintain the absorbent core in close contact with the groove of the buttocks.

[0063] (Technical Solution 12)

[0064] According to any one of technical solutions 1 to 11, the shorts-type sanitary napkin is characterized in that an inclined stretchable area is provided in the portion of the back waist section below the side joint, the inclined stretchable area having a portion that slopes downwards from both sides of the back waist section toward the center in the left-right direction and a portion that extends along the left-right direction in the center section. In the unfolded and stretched state, the shorts-type sanitary napkin has a fourth rectangular area divided by the pair of first imaginary lines, sixth imaginary lines, and seventh imaginary lines. The sixth imaginary line passes through one end of the inclined stretchable area near the waist and extends along the left-right direction, and the seventh imaginary line passes through one end of the inclined stretchable area near the crotch and extends along the left-right direction. When the fourth rectangular area is divided into five equal parts in the left-right direction, the adhesive has a lower unit area weight in the area adjacent to the fourth end area in the left-right direction compared to the fourth end area located on the outermost side in the left-right direction.

[0065] According to technical solution 12, in the fourth rectangular region that abuts against the beginning of the groove of the buttocks, the adjacent area has low stiffness and is prone to becoming a bending starting point. Therefore, the absorbent core can easily deform into a convex shape in a way that fits tightly against the beginning of the groove of the buttocks. In addition, the elastic member in the fourth rectangular region promotes the convex deformation of the absorbent core and easily maintains the absorbent core in close contact with the groove of the buttocks during wear. However, by using the inclined elastic member, the back waist area is stretched to the left and right sides by the bulges of the buttocks, which can prevent the absorbent core from digging excessively into the groove of the buttocks.

[0066] (Technical Solution 13)

[0067] According to any one of technical solutions 1 to 12, the shorts-type sanitary napkin is characterized in that the absorbent core has a narrowed portion that narrows inward in the left-right direction at least in the crotch area, and has a maximum width portion with the greatest length in the left-right direction at a position closer to the back than the narrowed portion; in the unfolded and stretched state, the shorts-type sanitary napkin has a fifth rectangular region divided by the pair of first imaginary lines, the second imaginary line, and the eighth imaginary line, the eighth imaginary line passing through the maximum width portion and extending in the left-right direction; when the fifth rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower unit area weight in the region adjacent to the fifth end region in the left-right direction compared to the fifth end region located on the outermost side in the left-right direction; and the back waist portion has an elastic member that is continuous and stretchable in the left-right direction at least in the fifth rectangular region.

[0068] According to technical solution 13, in the fifth rectangular region that abuts against the wider area of ​​the absorbent core, the adjacent area has lower stiffness and is easier to bend. Therefore, the absorbent core can easily deform into a convex shape to fit snugly against the buttocks. Furthermore, even when the absorbent core is deformed into a convex shape, the width of the absorbent core extending outwards (at the edge portions) is ensured, thus suppressing side leakage and alleviating the wearer's anxiety about leakage.

[0069] (Technical Solution 14)

[0070] According to any one of technical solutions 1 to 13, the panty-shaped sanitary napkin is characterized in that, in its unfolded and stretched state, the panty-shaped sanitary napkin has a sixth rectangular region divided by a pair of ninth, tenth, and eleventh imaginary lines. The pair of ninth imaginary lines pass through both ends of the portion of the absorbent core that overlaps with the abdominal waist portion in the thickness direction in the left-right direction and extend along the length direction. The tenth imaginary line passes through the end of the absorbent core that overlaps with the abdominal waist portion in the thickness direction on the waist side in the length direction and extends along the left-right direction. The eleventh imaginary line... The central position of the panty-type sanitary napkin in the length direction is bisected with the lower crotch end of the abdominal portion of the lateral joint in the length direction and extends along the left-right direction. When the sixth rectangular region is divided into five equal parts in the left-right direction, the adhesive unit area weight of the adhesive that joins the abdominal waist portion and the absorbent body is lower in the region adjacent to the inner side of the sixth end portion in the left-right direction compared to the outermost sixth end portion in the left-right direction. The abdominal waist portion has an abdominal elastic member that is continuous and stretchable in the left-right direction at least in the sixth rectangular region.

[0071] According to technical solution 14, in the sixth rectangular area that abuts against the wearer's lower abdomen, the area adjacent to the end area has lower stiffness and is more likely to become a bending starting point. Therefore, the absorbent core can easily deform outwards in a convex shape along the roundness of the lower abdomen. Consequently, gaps are less likely to form between the sanitary napkin and the wearer on the abdominal side, thus suppressing leakage and improving wearing comfort.

[0072] (Technical Solution 15)

[0073] According to any one of technical solutions 1 to 14, the shorts-type sanitary napkin is characterized in that the absorbent body has a length elastic member that stretches in the length direction at a position closer to the non-skin side than the absorbent core, and the length elastic member is provided at least in a portion of the rectangular region in the length direction.

[0074] According to technical solution 15, the absorbent core in the rectangular area that abuts against the groove of the wearer's buttocks is pushed upwards towards the skin by a length elastic member. Therefore, the absorbent core easily fits snugly against the groove of the wearer's buttocks and easily maintains a snug fit during wear.

[0075] (Technical Solution 16)

[0076] According to any one of technical solutions 1 to 15, the shorts-type sanitary napkin is characterized in that it satisfies at least one of the following two structures: it is provided with a cover sheet that is disposed across the waist-side end of the back portion of the absorbent body and covers that end from the skin side; the adhesive is provided at the waist-side end of the adjacent area in the rectangular region.

[0077] According to technical solution 16, the covering sheet can be used to suppress curling (peeling from the back waist) of the absorbent body at the waistside. Furthermore, by using an adhesive provided in an area adjacent to the end region, curling of the absorbent body at the waistside can be suppressed. Therefore, discomfort during wear caused by curling of the absorbent body's ends can be prevented.

[0078] (Technical Solution 17)

[0079] According to any one of technical solutions 1 to 16, the shorts-type sanitary napkin is characterized in that the shorts-type sanitary napkin has mutually orthogonal vertical, horizontal and front-back directions, and at the central position of the vertical direction between the upper end of the absorbent body and the lower end of the side joint, the length of the portion of the absorbent body located on the back side in the horizontal direction is shorter than the length of the portion of the absorbent body located on the abdomen side in the horizontal direction.

[0080] According to technical solution 17, in a sanitary napkin in its natural state, users who visually recognize that the absorbent body located on the back side contracts in the left-right direction are more likely to perceive the sanitary napkin as one that fits snugly against the buttocks, thus reducing the user's anxiety about back leakage.

[0081] (Technical Solution 18)

[0082] A shorts-type sanitary napkin has an absorbent body, a ventral waist section, and a dorsal waist section. The absorbent body has an absorbent core. The ventral waist section and the dorsal waist section are joined into a ring shape by a pair of lateral joints. The shorts-type sanitary napkin, in its unfolded and extended state, has mutually orthogonal length, left-right, and thickness directions. The shorts-type sanitary napkin has a rectangular area defined by a pair of first, second, and third imaginary lines. The pair of first imaginary lines pass through the two ends of the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction in the left-right direction and extend along the length direction. The pair of second imaginary lines pass through the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction. The third imaginary line bisects the length direction of the portion overlapping in the thickness direction at one end near the waist and extends along the left-right direction. It also bisects the length direction between the central position of the panty-type sanitary napkin and the crotch-side end of the back portion of the side joint and extends along the left-right direction. When the rectangular area is divided into five equal parts in the left-right direction, the adhesive unit area weight of the adhesive that joins the back waist portion to the absorbent body is lower in the central area compared to the outermost end area in the left-right direction. The back waist portion has an elastic member that is continuous and stretchable in the left-right direction at least in the rectangular area.

[0083] According to technical solution 18, the central region of the rectangular area has low stiffness and is easily deformed, thus allowing the absorbent core to easily deform into a convex shape to fit snugly against the wearer's buttocks. Furthermore, an elastic member facilitates the convex deformation of the absorbent core, and it easily maintains the absorbent core's close fit against the buttocks during wear. On the other hand, the end regions have higher stiffness, enabling them to support the convexly deformed portion of the absorbent core from below, further maintaining the absorbent core's close fit against the buttocks.

[0084] (Technical Solution 19)

[0085] A shorts-type sanitary napkin has an absorbent body, a ventral waist section, and a dorsal waist section. The absorbent body has an absorbent core. The ventral waist section and the dorsal waist section are joined into a ring shape by a pair of lateral joints. The shorts-type sanitary napkin, in its unfolded and extended state, has mutually orthogonal length, left-right, and thickness directions. The shorts-type sanitary napkin has a rectangular area divided by a pair of first, second, and third imaginary lines. The pair of first imaginary lines pass through the left-right ends of the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction and extend along the length direction. The pair of second imaginary lines pass through the portion of the absorbent core that overlaps with the dorsal waist section in the thickness direction and extend along the length direction. One end of the waist-side extends along the left-right direction. The third imaginary line bisects the length direction between the center position of the panty-type sanitary napkin and the lower crotch side end of the back-side portion of the side joint, and extends along the left-right direction. When the rectangular area is divided into five equal parts in the left-right direction, the outermost end region in the left-right direction has an adhesive area. This adhesive area is provided with an adhesive to join the back-side waist portion to the absorbent body. A non-adhesive area is arranged in the rectangular area inside the left-right direction than the adhesive area. This non-adhesive area is not provided with the adhesive. The back-side waist portion has an elastic member that is continuous and stretchable in the left-right direction, at least in the rectangular area.

[0086] According to technical solution 19, the portion where a stiffness difference exists between the adhesive area at the end region and the non-adhesive area located further inward than the adhesive area easily becomes a bending starting point, allowing the absorbent core to easily deform into a convex shape in a way that fits snugly against the groove of the wearer's buttocks. Furthermore, the use of an elastic member promotes the convex deformation of the absorbent core, and also easily maintains the absorbent core's close fit against the groove of the buttocks during wear. On the other hand, the higher stiffness of the end region allows it to support the convexly deformed portion of the absorbent core from below, easily maintaining the absorbent core's close fit against the groove of the buttocks.

[0087] ===Implementation Methods===

[0088] <<Basic Structure of Shorts-Type Sanitary Napkins 1>>

[0089] Figure 1 This is a front view of the panty-style sanitary napkin 1 viewed from the ventral side. Figure 2 This is a rear view of the shorts-type sanitary napkin 1 viewed from the back. Figure 3 This is a top view of a panty-shaped sanitary napkin 1 in its unfolded and stretched state, viewed from the skin side. Figure 4 of Figure 4 A is Figure 3A schematic cross-sectional view at the first centerline CL1. Figure 4 B is Figure 3 A schematic cross-sectional view at the second center line CL2. In the following description, the panty-style sanitary napkin will also be referred to simply as a "sanitary napkin". Furthermore, the first center line CL1 is a line extending in the left-right direction from the center point that bisects the product in the length direction, and the second center line CL2 is a line extending in the length direction from the center point that bisects the product in the left-right direction.

[0090] The unfolded state of the shorts-type sanitary napkin 1 refers to the state in which the sanitary napkin 1 is opened and unfolded in a flat plane by separating the pair of side joints 2 located on both sides of the sanitary napkin 1.

[0091] The stretched state of the shorts-type sanitary napkin 1 refers to the state in which the sanitary napkin 1 is stretched to the point where the wrinkles of the sanitary napkin 1 are no longer visually discernible. Specifically, the stretched state means that the dimensions of each component constituting the sanitary napkin 1 are the same as or close to the dimensions of the individual component.

[0092] The panty-style sanitary napkin 1 has mutually orthogonal vertical, horizontal, and front-back directions, and includes a waist opening (BH) and a pair of leg openings (LH). The upper side of the vertical opening (BH) corresponds to the waist opening (BH), and the lower side corresponds to the crotch area. The front side of the front-back opening corresponds to the wearer's abdomen, and the back side corresponds to the wearer's back. Additionally, as... Figure 4 A and Figure 4 As shown in Figure B, the direction in which the components constituting the sanitary napkin 1 are stacked is defined as the thickness direction. The side in the thickness direction that comes into contact with the wearer's skin is defined as the skin side, and the opposite side is defined as the non-skin side.

[0093] Additionally, the panty-style sanitary napkin 1 has an absorbent body 10, an abdominal waist section 20 covering the wearer's tummy, and a dorsal waist section 30 covering the wearer's back. For example... Figure 3 As shown, the panty-type sanitary napkin 1 has mutually orthogonal length, left-right, and thickness directions when unfolded. The length direction in the unfolded state corresponds to the up-down direction in the panty-type state. In the following description, the abdominal waist portion 20 and the back waist portion 30 will also be collectively referred to as waist portion 20 and 30.

[0094] In the unfolded state of the sanitary napkin 1, the abdominal waist section 20 and the back waist section 30 are positioned at intervals along their length, and an absorbent body 10 is positioned between the abdominal waist section 20 and the back waist section 30 along their length. Each end of the absorbent body 10 along its length is respectively joined and fixed to the skin side of the closest part of the abdominal waist section 20 or the back waist section 30. From this state, the absorbent body 10 is folded in half along its length, and the left and right sides of the opposing abdominal waist section 20 and back waist section 30 are connected by a pair of side joints 2, thus forming a panty-type sanitary napkin 1. That is, the abdominal waist section 20 and the back waist section 30 are joined into a ring shape by a pair of side joints 2. Furthermore, as a joining method using the side joints 2, examples include heat welding, ultrasonic welding, and joining methods using adhesives.

[0095] The absorbent body 10 includes: an absorbent core 11 that absorbs and retains menstrual blood and other excretory fluids; a liquid-permeable surface sheet 12 (e.g., nonwoven fabric, open-pore membrane, etc.) disposed on the skin side of the absorbent core 11; a liquid-impermeable back sheet 13 (e.g., resin membrane, etc.) disposed on the non-skin side of the absorbent core 11; and side sheets 14 (e.g., hydrophobic nonwoven fabric, etc.). Additionally, the outer peripheral surface of the absorbent core 11 may also be covered by a liquid-permeable core sheet 15 such as cotton paper or nonwoven fabric.

[0096] As the absorbent core 11, an absorbent core containing water-retaining fibers can be exemplified. There are no particular limitations on the water-retaining fibers as long as they have the property of absorbing and retaining moisture, such as cellulosic fibers (e.g., pulp fibers, non-wood fibers such as cotton and linen, regenerated fibers such as rayon, etc.).

[0097] A pair of leak-proof wall portions 3 are provided on both sides of the absorbent body 10 in the left-right direction, along the length direction of the absorbent body 10. The leak-proof wall portions 3 are formed by side pieces 14. Specifically, the portions of the side pieces 14 that cover the non-skin side of the backing sheet 13 and extend outward in the left-right direction are bent at multiple points and provided on both sides of the skin side of the surface sheet 12 in the left-right direction to form the leak-proof wall portions 3. A leak-proof wall elastic member 16 (e.g., elastic band) is installed on the leak-proof wall portion 3 in a state of elongation along the length direction. Based on the elasticity of the leak-proof wall elastic member 16, the leak-proof wall portion 3 stands upright towards the wearer's skin.

[0098] The ventral waist section 20 and the dorsal waist section 30 each include skin-friendly side panels 21 and 31, non-skin-friendly side panels 22 and 32 stacked on the non-skin-friendly side panels 22 and 32, and multiple waist elastic members 23 and 33 (e.g., elastic bands) that stretch in the lateral direction. Between the skin-friendly side panels 21 and 31 and the non-skin-friendly side panels 22 and 32, the multiple waist elastic members 23 and 33 are arranged vertically and installed in a laterally elongated state. The ventral waist section 20 and the dorsal waist section 30 conform to the wearer's waist using the elasticity of the waist elastic members 23 and 33.

[0099] Additionally, cover plates 24 and 34 can be provided to cover the upper part of the absorbent body 10 from the skin side. By using cover plates 24 and 34, it is possible to prevent the upper edge of the absorbent body 10 from digging into the wearer's skin and to suppress the opening of the absorbent body 10.

[0100] In addition, such as Figure 3 As shown, the planar shapes of the ventral waist portion 20 and the dorsal waist portion 30 in their unfolded and elongated states are different. The vertical length of the ventral waist portion 20 is approximately the same as the length of the lateral joint portion 2, and the ventral waist portion 20 is a rectangular shape that is longer in the horizontal direction. The dorsal waist portion 30 has a rectangular waist portion 30A that overlaps with the ventral waist portion 20 and a roughly trapezoidal crotch portion 30B that extends to a position lower than the waist portion 30A (lower than the lateral joint portion 2).

[0101] Additionally, an inclined elastic member 35 (e.g., an elastic band) is provided at the lower end of the back waist section 30 (from the lower end of the side joint 2 to the crotch side section 30B). The inclined elastic member 35 is arranged approximately along the lower outer edge of the back waist section 30, having a portion that slopes downwards from both sides toward the center of the back waist section 30 in the left-right direction and a portion that extends in the left-right direction at the center of the back waist section 30. The inclined elastic member 35 is also installed in an extended state between the skin side panel 31 and the non-skin side panel 32, utilizing the elasticity of the inclined elastic member 35 to allow the crotch side section 30B of the back waist section 30 to easily conform to the wearer's buttocks without rolling up. Furthermore, in Figure 2 In the example, three elastic bands are shown as inclined elastic members 35, but the number of elastic bands is not particularly limited.

[0102] The area where the inclined elastic member 35 is provided, that is, the area surrounded by the inclined elastic member 35a located on the uppermost side and the inclined elastic member 35c located on the lowermost side, is called the inclined stretching region A35. Alternatively, the inclined elastic member 35 may also be a sheet-like elastic member (stretchable nonwoven fabric, stretchable film, etc.). In this case, the part that exhibits stretchability by being provided with stretchable nonwoven fabric is called the inclined stretching region A35.

[0103] The above describes the basic structure of sanitary napkin 1, but the structure of sanitary napkin 1 described above is an example and is not limited to this.

[0104] For example, a liquid-permeable intermediate sheet may be provided between the surface sheet 12 and the core sheet 15.

[0105] Alternatively, the back waist section 30 may not have the crotch side section 30B and the inclined elastic member 35, but may have the same planar shape as the abdominal waist section 20. The abdominal waist section 20 may also have a part that extends downward to the crotch side.

[0106] Alternatively, linear waist elastic members 23 and 33 can be provided at the upper end (waist) of the waist sections 20 and 30 and reliably fitted, with an elastic sheet positioned lower on the lower side instead of the linear waist elastic members 23 and 33. By placing an elastic sheet between the skin-side sheets 21 and 31 and the non-skin-side sheets 22 and 32, the overlapping sheets are intermittently joined, allowing the waist sections 20 and 30 to exhibit elasticity and softly conform to the wearer's waist in a flat form.

[0107] In addition, Figure 3 In the sanitary napkin 1 shown, the length of the part of the back waist section 30 that extends outward in the left and right directions from the inclined elastic member 35 can be shorter.

[0108] ===First Implementation Method===

[0109] <<Regarding the bonding between the absorbent main body 10 and the waist sections 20 and 30>>

[0110] Figure 5 A is an explanatory diagram of the bonding area 10R located in the absorbent body 10. Figure 5 B is an explanatory diagram of the bonding area 20R located at the waist and body sections 20 and 30. Figure 6 This is an explanatory diagram of the adhesive area 1R of the sanitary napkin 1. The adhesive area 1R of the sanitary napkin 1 is the area formed by the overlap of the adhesive area 10R of the absorbent body 10 and the adhesive area 20R of the waist part 20, 30. Figure 7 A and Figure 7 B is an explanatory diagram of the first rectangular region Ra.

[0111] Unlike the shorts-type sanitary napkin 1 of this embodiment, disposable diapers require a space on the back to collect feces and a space to store urine before it is absorbed by the absorbent core. In contrast, the shorts-type sanitary napkin 1 is primarily used to absorb menstrual blood. Compared to urine, menstrual blood has a higher viscosity, tends to flow down the body (the crease of the buttocks), and tends to spread easily on the surface sheet, and the amount excreted is relatively small. Therefore, in the shorts-type sanitary napkin 1, the absorbent core 11 is designed to fit snugly against the crease of the wearer's buttocks. This helps to prevent leakage caused by menstrual blood flowing down the gap between the sanitary napkin and the wearer.

[0112] like Figure 7 A and Figure 7 As shown in B, the shorts-type sanitary napkin 1 of this embodiment has a "first rectangular area Ra (rectangular area)" for the wearer's buttocks to rub against. In the unfolded and stretched state of the sanitary napkin 1, the first rectangular area Ra is divided by a pair of "first imaginary lines Lv1", "second imaginary lines Lv2" and "third imaginary lines Lv3". The pair of "first imaginary lines Lv1" pass through the two ends 11a of the portion of the absorbent core 11 that overlaps with the back waist portion 30 in the thickness direction in the left and right directions and extend in the length direction. The "second imaginary line Lv2" passes through the upper end 11b (the end near the waist in the length direction) of the portion of the absorbent core 11 that overlaps with the back waist portion 30 in the thickness direction and extends in the left and right directions. The "third imaginary line Lv3" divides the central position CL1 of the sanitary napkin 1 in the length direction and the lower end 2a (the end near the crotch) of the back portion of the side joint 2 in the length direction into two equal parts and extends in the left and right directions.

[0113] When the first rectangular region Ra is divided into five equal parts in the left and right directions, compared with the first end regions (end regions) Ra1 and Ra5 located on the outermost side in the left and right directions, the unit area weight (g / m²) of the adhesive that joins the back waist part 30 and the absorbent body 10 in the first adjacent regions Ra2 and Ra4 adjacent to the first end regions Ra1 and Ra5 on the inner side in the left and right directions is as follows: 2 (Lower). In the following description, the adhesive that joins the back side waist portion 30 and the absorbent body 10 is also referred to simply as adhesive.

[0114] In this embodiment, compared to the first end regions Ra1 and Ra5, the area of ​​the adhesive region 1R that joins the back side waist portion 30 and the absorbent body 10 in the first adjacent regions Ra2 and Ra4 is smaller. Specifically, as Figure 5 As shown in Figure A, adhesive is applied to both sides in the left-right direction on the back side of the absorbent body 10, and a rectangular adhesive region 10R extending longitudinally is provided. No adhesive is applied to the region on the inner side in the left-right direction beyond this adhesive region 10R. Furthermore, as... Figure 5 As shown in Figure B, no adhesive is applied to the back waist section 30, and therefore no adhesive area is provided. Therefore, in the sanitary napkin 1 formed by joining the absorbent body 10 with the back waist section 30, as... Figure 6 As shown, adhesive regions 1R (10R) are provided only on both sides of the back side of the absorbent body 10 in the left-right direction. These adhesive regions 1R are positioned to overlap with both sides of the absorbent core 11 in the longitudinal direction, as shown... Figure 7 As shown in Figure B, the adhesive region 1R is located in the first end regions Ra1 and Ra5. Furthermore, the first adjacent regions Ra2 and Ra4 do not have the adhesive region 1R.

[0115] Thus, compared to the first end regions Ra1 and Ra5, the area of ​​the bonding region 1R in the first adjacent regions Ra2 and Ra4 is smaller, and the weight per unit area of ​​the adhesive is lower, resulting in lower stiffness and easier deformation in the first adjacent regions Ra2 and Ra4. Furthermore, it is not limited to changing the area of ​​the bonding region 1R in the first end regions Ra1 and Ra5 and the first adjacent regions Ra2 and Ra4. For example, even if the areas are the same, if the weight per unit area of ​​the adhesive in the first adjacent regions Ra2 and Ra4 is lower (the coating is thinner), the stiffness of the first adjacent regions Ra2 and Ra4 will also decrease.

[0116] In other words, in the sanitary napkin 1 of this embodiment, in the first rectangular area Ra that abuts against the groove of the wearer's buttocks, a stiffness difference is generated between the first end areas Ra1 and Ra5 corresponding to the two sides of the absorbent core 11 in the left-right direction and the first adjacent areas Ra2 and Ra4 inside the first end areas Ra1 and Ra5. Therefore, the boundary of the stiffness difference becomes the bending starting point, and the first adjacent areas Ra2 and Ra4, which are low stiffness parts, are easy to bend. As a result, when the sanitary napkin 1 is lifted to put on, when the absorbent core 11 is pressed against the wearer's buttocks, the first adjacent areas Ra2 and Ra4 bend, and the absorbent core 11 deforms along the groove of the buttocks and easily enters the groove. That is, the central part of the absorbent core 11 in the left-right direction, which is inside the first end areas Ra1 and Ra5, easily deforms in a way that protrudes towards the skin and easily enters the groove. As a result, the absorbent core 11 fits snugly against the groove of the wearer's buttocks, which can inhibit the flow and leakage of menstrual blood.

[0117] Moreover, such as Figure 7 As shown in Figure A, the back waist portion 30 has elastic members that are continuous in the left-right direction and extend and retract in the left-right direction, at least within the first rectangular region Ra. In the sanitary napkin 1 of this embodiment, a plurality of waist elastic members 33 and a plurality of inclined elastic members 35 are continuous in the left-right direction and extend and retract within the first rectangular region Ra.

[0118] The elastic members 33 and 35 also exhibit elasticity in the area overlapping with the absorbent core 11, thus applying a force of contraction in the left-right direction to the absorbent core 11. Even when the absorbent core 11 is about to contract in the left-right direction, it will not form wrinkles randomly, but rather the first adjacent areas Ra2 and Ra4, which are low-stiffness parts, are easy to bend. That is, the elastic members 33 and 35 in the first rectangular area Ra promote the convex deformation of the absorbent core 11. As a result, the absorbent core 11 can more easily deform in a way that fits snugly against the groove of the wearer's buttocks. In addition, the elastic members 33 and 35 in the first rectangular area Ra easily maintain the absorbent core 11 in a state that fits snugly against the groove of the buttocks, and can suppress back leakage even if the wearer moves to a great extent, such as turning over.

[0119] Furthermore, the comparison of the unit area weight of the adhesive can be performed using known methods. For example, a sample is taken from a sanitary napkin 1, containing a target area (first end areas Ra1, Ra5 and first adjacent areas Ra2, Ra4, etc.). After measuring the weight of the cut sample, the adhesive is dissolved using toluene or the like. The weight of the sample after drying is measured. The weight of the adhesive applied to the sample is defined as the weight (g) of the adhesive applied to the sample, obtained by subtracting the weight of the sample after dissolving the adhesive from the weight of the sample before dissolving the adhesive. Then, based on the sample area (m²), the adhesive is... 2 Calculate the weight per unit area and compare them.

[0120] Furthermore, the average weight per unit area of ​​the adhesive in the two first end regions Ra1 and Ra5 is compared with the average weight per unit area of ​​the adhesive in the two first adjacent regions Ra2 and Ra4. In the case where the target region is the left and right regions, the average weight per unit area of ​​the adhesive in the two regions is used for comparison. The same applies to comparing the weight per unit area of ​​the adhesive in the following embodiments.

[0121] Furthermore, the bonding area 1R is a closed region surrounded by straight lines along the left-right and length directions, circumscribed to the area where adhesive is actually applied. The adhesive can be a so-called full coating, applied to the entire surface of the bonding area 1R without omission, or it can be applied in a known coating pattern (e.g., spiral pattern, omega pattern, line pattern, etc.). Specifically, in the case of patterned adhesive application, areas with a gap of less than 1.5 mm between the adhesive and the surrounding adhesive are included within the bonding area 1R.

[0122] Furthermore, it is preferable that the back waist section 30 is constructed as a separate component from the abdominal waist section 20. This prevents the wearer's groin movements (such as opening and closing the legs) from being transmitted to the back side via the outer component, compared to a continuous, one-piece outer component from the back waist section to the abdominal waist section. Consequently, it is easier to maintain the absorbent core 11 in close contact with the wearer's buttocks.

[0123] Furthermore, since the abdominal waist section 20 is separated from the back waist section 30, when the sanitary napkin 1 is lifted up, the lifting force is easily concentrated at the junction of the back waist section 30 and the absorbent body 10 (the adhesive area 1R on the back). Therefore, the force that presses the absorbent core 11 against the wearer's buttocks is easily applied, allowing the absorbent core 11 to easily enter along the groove of the buttocks and adhere tightly to the groove of the buttocks.

[0124] However, it is not limited to the above situation, and may also be part of an integral outer component that is continuous from the back waist section to the abdominal waist section (e.g., an outer component with a roughly hourglass shape in planar shape). In this case, the sanitary napkin 1 in its unfolded and extended state is divided into three parts in the length direction, with the portion of the outer component located on the back side designated as the back waist section, and the portion of the outer component located on the abdominal side designated as the abdominal waist section. Alternatively, it may be a sanitary napkin having an outer component that is an outer component for the crotch area, which connects the abdominal waist section 20 and the back waist section 30 as separate components and is a separate component relative to the abdominal waist section 20 and the back waist section 30.

[0125] Figure 8 A and Figure 8 B is an explanatory diagram of the second rectangular region Rb and the third rectangular region Rc. The sanitary napkin 1 has a "second rectangular region Rb", which is the area from the lower end 2a of the side joint 2 to the lower end 30a of the back waist part 30, and abuts against the part of the cleft of the wearer's buttocks that deepens from the beginning. In the unfolded and stretched state of the sanitary napkin 1, the second rectangular region Rb is divided by a pair of first imaginary lines Lv1, a fourth imaginary line Lv4 that passes through the lower end 2a of the back part of the side joint 2 (the lower crotch side end in the length direction) and extends in the left and right direction, and a fifth imaginary line Lv5 that passes through the lower end 30a of the back waist part 30 (the lower crotch side end in the length direction) and extends in the left and right direction.

[0126] Preferably, when the second rectangular region Rb is divided into five equal parts in the left-right direction, the adhesive weight per unit area is lower in the second adjacent regions Rb2 and Rb4 that are adjacent to the second end regions Rb1 and Rb5 on the inner side in the left-right direction compared to the second end regions Rb1 and Rb5 located at the outermost position in the left-right direction. Figure 8In B, the adhesive region 1R is only present in the second end regions Rb1 and Rb5, while the second adjacent regions Rb2 and Rb4 do not have the adhesive region 1R.

[0127] Furthermore, preferably, the back waist portion 30 has an elastic member that is continuous in the left-right direction and expands and contracts in the left-right direction, at least in the second rectangular region Rb. Figure 8 (Inclination elastic member 35 in A).

[0128] Therefore, the second adjacent regions Rb2 and Rb4 have lower stiffness and are more prone to deformation. Consequently, in the area where the groove of the buttocks deepens from the beginning, the second adjacent regions Rb2 and Rb4 bend, making it easy for the absorbent core 11 to deform into a convex shape in a way that fits snugly against the groove of the buttocks. In addition, the second adjacent regions Rb2 and Rb4 bend due to the contraction of the inclined elastic member 35, which promotes the convex deformation of the absorbent core 11, thereby making it easier to maintain the state of the absorbent core 11 fitting snugly against the groove of the buttocks during wear.

[0129] Furthermore, although it is not present in the sanitary napkin 1 of this embodiment, it may also be present in the second rectangular region Rb, in the part of the back waist portion 30 below the side joint portion 2, where an elastic member is arranged in a straight line along the left and right direction from one end to the other.

[0130] In addition, such as Figure 8 As shown in Figure A, the sanitary napkin 1 has a "third rectangular region Rc", which is the area from the lower end 2a of the side joint 2 to the upper end 11b of the absorbent core 11, and abuts against the end of the groove of the wearer's buttocks. The third rectangular region Rc is divided by a pair of first imaginary lines Lv1, second imaginary lines Lv2 and fourth imaginary lines Lv4 in the unfolded and stretched state of the sanitary napkin 1.

[0131] Preferably, when the third rectangular region Rc is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the third adjacent regions Rc2 and Rc4 that are adjacent to the third end regions Rc1 and Rc5 in the left-right direction on the outermost side of the third end regions Rc1 and Rc5. Figure 8 In B, the adhesive region 1R is only present in the third end regions Rc1 and Rc5, while the adhesive region 1R is not present in the third adjacent regions Rc2 and Rc4.

[0132] Furthermore, preferably, the back waist portion 30 has an elastic member that is continuous in the left-right direction and expands and contracts in the left-right direction at least in the third rectangular region Rc. Figure 8 (33) of the waist elastic component in A).

[0133] Therefore, the third adjacent regions Rc2 and Rc4 have lower stiffness and are more prone to deformation. Consequently, at the end of the groove in the wearer's buttocks, the third adjacent regions Rc2 and Rc4 bend, allowing the absorbent core 11 to easily deform into a convex shape, fitting snugly against the groove. Furthermore, the third adjacent regions Rc2 and Rc4 bend due to the contraction of the waist elastic member 33, promoting the convex deformation of the absorbent core 11, thus easily maintaining its close fit against the groove during wear. Particularly between the side joints 2, the abdominal waist elastic member 23 and the back waist elastic member 33 easily form a continuous ring, making it easier to maintain the absorbent core 11's close fit against the groove even during larger movements such as turning over.

[0134] Furthermore, because the third adjacent regions Rc2 and Rc4 have low stiffness and are easily deformed, the absorbent core 11 can easily switch from a convex shape to a flat shape along the flat portion of the back, starting from the end of the groove in the buttocks. Therefore, the absorbent core 11 can easily fit snugly against the flat portion of the back, further suppressing back leakage. Additionally, preventing the convex absorbent core 11 from contacting the back reduces discomfort during wear.

[0135] Figure 9 A, Figure 9 B. Figure 10 A and Figure 10 B is an explanatory diagram of a modified example of the adhesive region 1R. The adhesive region 1R, which joins the absorbent body 10 to the waist portions 20 and 30, is illustrated as follows: Figure 6 However, the shape, area, number, and placement of the bonding area 1R are not limited to this. For example, in Figure 9 A and Figure 9 In a variation of B, the first adjacent regions Ra2 and Ra4 in the first rectangular region Ra are also provided with an adhesive region 1R. However, compared with the adhesive region 1R of the first end regions Ra1 and Ra5, the area of ​​the adhesive region 1R of the first adjacent regions Ra2 and Ra4 is smaller, and the weight per unit area of ​​the adhesive is lower.

[0136] Preferably, when the first rectangular region Ra is divided into five equal parts in the left-right direction, the three regions Ra2 to Ra4, which are located inside the first end regions Ra1 and Ra5 in the left-right direction, have non-adhesive areas (regions not marked with diagonal lines in the drawings) without adhesive. This can be achieved as follows: Figure 7 As shown in B, the entire area of ​​the three regions Ra2 to Ra4 is a non-bonded area, or it can be like... Figure 9 A, Figure 9 As shown in the modified example of B, the three regions Ra2 to Ra4 are partially non-bonded areas.

[0137] For example, by applying a thinner layer of adhesive to the three inner regions Ra2 to Ra4 compared to the first end regions Ra1 and Ra5, the stiffness of the three inner regions Ra2 to Ra4 can be reduced. However, since the three inner regions Ra2 to Ra4 each have non-adhesive areas, the stiffness is further reduced, making them prone to deformation. In this case, the first adjacent regions Ra2 and Ra4 bend due to the stiffness difference with the first end regions Ra1 and Ra5, the absorbent core 11 deforms convexly, and the three inner regions Ra2 to Ra4 easily follow the shape of the buttock groove and surrounding area. Therefore, gaps are less likely to form between the buttock groove and surrounding area and the sanitary napkin 1, thus suppressing menstrual blood leakage.

[0138] In addition, such as Figure 9 As shown in Figure A, in the unfolded and stretched state of the sanitary napkin 1, the first adjacent regions Ra2 and Ra4 in the first rectangular region Ra are divided into a portion that overlaps with the side joint 2 in the length direction (overlapping portion RO) and a portion that is lower than the side joint 2 on the crotch side (protruding portion RE). Moreover, at least one of the overlapping portion RO and the protruding portion RE of the first adjacent regions Ra2 and Ra4 has an adhesive region 1R and a non-adhesive region, and it is preferable that the length W4 (maximum width of the non-adhesive region) in the left-right direction of the non-adhesive region is longer than the length W3 (maximum width of the adhesive region) in the left-right direction of the adhesive region (W4 > W3).

[0139] In this case, the length W4 of the non-adhesive region in the left-right direction is shorter than the overall width W3+W4 of the first adjacent regions Ra2 and Ra4, but longer than the length W3 of the adhesive region 1R in the left-right direction. By appropriately increasing the length of the non-adhesive region in the left-right direction, the non-adhesive region can easily become a clear bending starting point. Therefore, the absorbent core 11 at the first adjacent regions Ra2 and Ra4 bends, making it easy for the absorbent core 11 to deform convexly in a way that fits tightly against the groove of the buttocks.

[0140] It can also be the opposite of the above, such as Figure 9 As shown in B, in at least one of the overlapping portion RO and the protruding portion RE of the first adjacent regions Ra2 and Ra4, the length W6 of the non-adhesive region in the left-right direction is shorter than the length W5 of the adhesive region 1R in the left-right direction (W6 < W5).

[0141] In this case, the absorbent core 10 at the first adjacent regions Ra2 and Ra4 and the back waist portion 30 are reliably joined using the longer adhesive region 1R in the left-right direction. Therefore, friction caused by the movement of the absorbent core 10 and the back waist portion 30 can be reduced, and product breakage can be prevented. In addition, even if the length (W6) is short, the absorbent core 11 at the first adjacent regions Ra2 and Ra4 can be easily bent using the non-adhesive region, so that the absorbent core 11 can easily deform into a convex shape in a way that fits tightly against the groove of the buttocks.

[0142] Or, it can be like Figure 7 As shown in B, at least one of the overlapping portion RO and the protruding portion RE of the first adjacent regions Ra2 and Ra4 is a non-adhesive region in which no adhesive is provided in the overall region.

[0143] In this case, the stiffness of the first adjacent regions Ra2 and Ra4 is further reduced, making them prone to deformation. Moreover, in the first adjacent regions Ra2 and Ra4, the movements of the absorbent body 10 and the back waist portion 30 are not linked. Therefore, although the back waist portion 30 is easy to contract, the absorbent body 10 is difficult to contract. Utilizing this contraction difference, the absorbent core 11 in the absorbent body 10 is easy to bend, and the absorbent core 11 is easy to deform into a convex shape in a way that fits tightly against the groove of the buttocks.

[0144] Furthermore, when the first rectangular region Ra is divided into five equal parts in the left-right direction, the central region Ra3 is also divided into an overlapping portion RO that overlaps with the side joint 2 in the length direction and a protruding portion RE that is lower than the side joint 2. (As in the modified example) Figure 9 As shown in Figure A, it is preferable that at least one of the overlapping portion RO and the protruding portion RE of the central region Ra3 has an adhesive region 1R and a non-adhesive region. Furthermore, it is preferable that the adhesive region 1R overlaps with the central position of the central region Ra3 in the left-right direction (i.e., the second center line CL2 in the left-right direction of the sanitary napkin 1) in the thickness direction. Additionally, it is preferable that the non-adhesive regions are located on both outer sides of the adhesive region 1R in the left-right direction.

[0145] Therefore, the adhesive area 1R with higher stiffness in the central region Ra3 becomes the bending starting point, making it easy for the absorbent core 11 to fold to the left and right. This allows the absorbent core 11 to easily deform into a convex shape, fitting snugly against the buttocks. Furthermore, when the absorbent core 11 is deformed into a convex shape, the top of the convex portion formed by the adhesive area 1R facilitates the insertion of the absorbent core 11 into the buttocks. Additionally, since the two outer sides of the adhesive area 1R become non-adhesive areas with lower stiffness, the adhesive area 1R, which forms the top of the convex portion, enters the buttocks, and the two outer non-adhesive areas easily follow the shape of the groove and surrounding area. Therefore, gaps are less likely to form between the buttocks and the sanitary napkin 1, thus suppressing menstrual blood leakage.

[0146] It can also be the opposite of the above, such as Figure 7 B. Figure 9 As shown in B, at least one of the overlapping portion RO and the protruding portion RE of the central region Ra3 is a non-adhesive region in which no adhesive is applied in the overall region.

[0147] In this case, the stiffness of the central region Ra3 decreases, making it more prone to deformation. Therefore, when the first adjacent regions Ra2 and Ra4 bend and the absorbent core 11 deforms into a convex shape, the central region Ra3 as a whole easily follows the shape of the buttock groove and surrounding area. Consequently, gaps are less likely to form between the buttock groove and surrounding area and the sanitary napkin 1, thus inhibiting the flow and leakage of menstrual blood.

[0148] In addition, such as Figure 9 As shown in Figure A, it is preferable that at least one of the overlapping portion RO of the first end regions Ra1, Ra5 and the central region Ra3, and the protruding portion RE of the first end regions Ra1, Ra5 and the central region Ra3, has an adhesive region 1R. Furthermore, it is preferable that one or both of the following two structures are satisfied: at the overlapping portion RO, the length (W7) of the adhesive region 1R of the first end regions Ra1, Ra5 in the left-right direction is longer than the length (W8) of the adhesive region 1R of the central region Ra3 in the left-right direction; at the protruding portion RE, the length (W7) of the adhesive region 1R of the first end regions Ra1, Ra5 in the left-right direction is longer than the length (W8) of the adhesive region 1R of the central region Ra3 in the left-right direction.

[0149] Therefore, by utilizing the relatively long adhesive regions 1R in the left-right direction of the first end regions Ra1 and Ra5, the two sides of the absorbent body 10 in the longitudinal direction can be reliably joined to the back waist portion 30, and peeling of the absorbent body 10 from the back waist portion 30 can be suppressed. In addition, since the first end regions Ra1 and Ra5 have high rigidity, the convex deformation portion of the absorbent core 11 located inside them can be reliably supported from below. On the other hand, since the adhesive region 1R in the central region Ra3 has a relatively short length in the left-right direction, the absorbent core 11 can easily fold convexly to the left and right. Furthermore, when the absorbent core 11 is deformed into a convex shape, the top of the convex portion is formed, making it easy for the absorbent core 11 to enter the groove of the buttocks.

[0150] Figure 11 A and Figure 11 B is an explanatory diagram illustrating the fourth rectangular region Rd and the fifth rectangular region Re. (See diagram for example.) Figure 11As shown in Figure A, the sanitary napkin 1 has a "fourth rectangular area Rd", which is an area that overlaps with the inclined stretchable area A35 and abuts against the beginning of the groove of the wearer's buttocks. In the unfolded and stretched state of the sanitary napkin 1, the fourth rectangular area Rd is divided by a pair of first imaginary lines Lv1, a sixth imaginary line Lv6 that passes through the upper end 35a (the end near the waist in the length direction) of the inclined stretchable area A35 and extends in the left and right direction, and a seventh imaginary line Lv7 that passes through the lower end 35c (the end near the crotch in the length direction) of the inclined stretchable area A35 and extends in the left and right direction.

[0151] Preferably, when the fourth rectangular region Rd is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the fourth adjacent regions Rd2 and Rd4 that are adjacent to the fourth end regions Rd1 and Rd5 in the left-right direction on the inner side of the fourth end regions Rd1 and Rd5. Figure 11 In B, the adhesive region 1R is only present in the fourth end regions Rd1 and Rd5, while the adhesive region 1R is not present in the fourth adjacent regions Rd2 and Rd4.

[0152] Therefore, the fourth adjacent regions Rd2 and Rd4 have low stiffness and are easily deformed. Consequently, at the beginning of the groove in the wearer's buttocks, the fourth adjacent regions Rd2 and Rd4 bend, making it easy for the absorbent core 11 to deform convexly in a way that fits tightly against the groove in the buttocks. In addition, the fourth adjacent regions Rd2 and Rd4 bend due to the contraction of the inclined elastic member 35, which promotes the convex deformation of the absorbent core 11 and makes it easier to maintain the state of the absorbent core 11 fitting tightly against the groove in the buttocks during wear.

[0153] However, it is not limited to the above description, for example, such as Figure 10 As shown in the variation of A, an adhesive region 1R extending continuously in the left-right direction may also be provided in the area where the inclined elastic member 35 is provided. By bonding the inclined stretchable region A35 of the back waist portion 30 to the absorbent body 10, the stiffness of the lower part of the back waist portion 30 is increased, and the contraction of the lower part of the back waist portion 30 in the left-right direction can be suppressed. Therefore, the lower part of the back waist portion 30 can cover the buttocks, providing the wearer with a sense of security.

[0154] Furthermore, preferably, the telescopic force of the inclined telescopic region A35 is lower than the telescopic force of the waist elastic member 33. More specifically, preferably, it is lower than the telescopic force of the first rectangular region Ra( Figure 7 Compared to the portion in the 4th rectangular region Rd (the portion of the inclined telescopic region A35 that overlaps with the absorbent body 10) where the waist elastic member 33 is configured, the force used to extend the region of a unit length in the vertical direction by a predetermined length in the horizontal direction is weaker.

[0155] Furthermore, a sample is taken from the sanitary napkin 1, specifically the area separating the back waist section 30 from the absorbent body 10, the inclined stretchable area A35, and the portion equipped with the waist elastic member 33. It is then preferable to use a tensile testing machine to obtain and compare the load (the value per unit width (mm) in the vertical direction (N / mm)) when the sample is stretched to a predetermined length in the lateral direction.

[0156] As described above, by reducing the elastic force of the inclined stretchable area A35, the convex deformation of the absorbent core 11 near the crotch area can be appropriately suppressed. Therefore, side leakage of menstrual blood can be suppressed, and the wearer's anxiety about leakage can be reduced. On the other hand, by increasing the elastic force of the waist elastic member 33, the convex deformation of the absorbent core 11 is promoted in the area where the buttock groove deepens, making it easier for the absorbent core 11 to fit snugly against the buttock groove.

[0157] Furthermore, by having an inclined stretchable area A35 in the sanitary napkin 1, when the sanitary napkin 1 is lifted, the bulges on the left and right sides of the buttocks stretch the back waist area 30 outwards in the left and right directions, which can prevent the absorbent core 11 from excessively digging into the buttock groove. Therefore, while the absorbent core 11 can be deformed into a convex shape, the width of the absorbent core 11 can be properly ensured, thus suppressing side leakage and reducing the wearer's anxiety about leakage.

[0158] In addition, such as Figure 5 As shown in Figure A, preferably, the absorbent core 11 has a narrowed portion 11D that narrows inward in the left-right direction at least in the crotch area, and a maximum width portion 11E located on the back side of the crotch area, which has the greatest length in the left-right direction. Therefore, movements of the wearer's crotch area (such as opening and closing the legs) are less likely to act on the absorbent core 11, and the transmission of such movements to the back side of the absorbent core 11 can be suppressed. Consequently, it is easier to maintain the absorbent core 11 in close contact with the cleft of the wearer's buttocks.

[0159] When the absorbent core 11 has the above-described shape, such as Figure 11 As shown in Figure A, the sanitary napkin 1 has a "fifth rectangular region Re" that extends from the maximum width portion 11E to the upper end 11b of the absorbent core 11. In the unfolded and stretched state of the sanitary napkin 1, the fifth rectangular region Re is divided by a pair of first imaginary lines Lv1 and Lv2, and an eighth imaginary line Lv8 that passes through the maximum width portion 11E and extends in the left-right direction. Furthermore, when the maximum width portion 11E has a length in the longitudinal direction, the eighth imaginary line Lv8 is designed to pass through the lower end of the maximum width portion 11E.

[0160] Preferably, when the fifth rectangular region Re is divided into five equal parts in the left-right direction, the adhesive weight per unit area is lower in the fifth adjacent regions Re2 and Re4 that are adjacent to the fifth end regions Re1 and Re5 in the left-right direction on the inner side of the fifth end regions Re1 and Re5 compared to the fifth end regions Re1 and Re5 located on the outermost side in the left-right direction. Figure 11 In B, the adhesive region 1R is only present in the 5th end regions Re1 and Re5, while the adhesive region 1R is not present in the 5th adjacent regions Re2 and Re4.

[0161] Furthermore, preferably, the back waist portion 30 has an elastic member that is continuous in the left-right direction and expands and contracts in the left-right direction at least in the fifth rectangular region Re. Figure 11 (33) of the waist elastic component in A).

[0162] Therefore, the fifth adjacent regions Re2 and Re4 have lower stiffness and are more prone to deformation. This allows the absorbent core 11 to easily deform into a convex shape, fitting snugly against the buttocks. Furthermore, the fifth adjacent regions Re2 and Re4 bend due to the contraction of the waist elastic member 33, promoting the convex deformation of the absorbent core 11 and maintaining its close fit against the buttocks during wear. Additionally, even when the absorbent core 11 deforms convexly, the length of the portion extending laterally beyond the convex portion of the absorbent core 11 (the length of the end edge of the convex portion) is ensured in the maximum width portion 11E and its surrounding area. Therefore, side leakage is suppressed, reducing the wearer's anxiety about leakage.

[0163] Figure 12 A and Figure 12 B is an explanatory diagram of the 6th rectangular region Rf. The ventral side of the absorbent core 11 is described here. (See diagram below.) Figure 12 As shown in Figure A, the sanitary napkin 1 has a "sixth rectangular area Rf" that abuts against the lower abdomen of the wearer. In the unfolded and stretched state of the sanitary napkin 1, the sixth rectangular area Rf is divided by a pair of ninth imaginary lines Lv9, tenth imaginary lines Lv10 and eleventh imaginary lines Lv11. The pair of ninth imaginary lines Lv9 pass through the left and right ends 11c of the portion of the absorbent core 11 that overlaps with the abdominal waist portion 20 in the thickness direction and extend along the length direction. The tenth imaginary line Lv10 passes through the upper end 11d (the end on the waist side in the length direction) of the portion of the absorbent core 11 that overlaps with the abdominal waist portion 20 in the thickness direction and extends along the left and right directions. The eleventh imaginary line Lv11 bisects the central position CL1 of the sanitary napkin 1 in the length direction with the lower end 2b (the end on the crotch side in the length direction) of the side joint portion 2 on the abdominal side in the length direction and extends along the left and right directions.

[0164] When the sixth rectangular region Rf is divided into five equal parts in the left and right directions, compared with the sixth end regions Rf1 and Rf5 located on the outermost side in the left and right directions, it is preferable that the adhesive unit area weight of the adhesive that joins the ventral waist portion 20 to the absorbent body 10 is lower in the sixth adjacent regions Rf2 and Rf4 that are adjacent to the sixth end regions Rf1 and Rf5 on the inner side in the left and right directions.

[0165] like Figure 5 As shown in Figure A, rectangular bonding areas 10R, which are longer in the longitudinal direction, are provided on both sides of the ventral portion of the absorbent body 10. On the other hand, as... Figure 5 As shown in Figure B, rectangular bonding areas 20R, which are longer in the left-right direction, are provided at the upper and lower ends of the ventral waist portion 20. Therefore, as... Figure 12 As shown in Figure B, in the sixth end regions Rf1 and Rf5, adhesive regions 1R are provided over a large range in the length direction, and the adhesive regions 1R are arranged overlappingly at the upper and lower ends. On the other hand, in the sixth adjacent regions Rf2 and Rf4, adhesive regions 1R are provided only at the upper and lower ends. Therefore, compared with the sixth end regions Rf1 and Rf5, the unit area weight of the adhesive is lower in the sixth adjacent regions Rf2 and Rf4.

[0166] Additionally, preferably, the ventral waist portion 20 has a ventral elastic member (waist elastic member 23) that is continuous in the left-right direction and stretches in the left-right direction at least in the sixth rectangular region Rf.

[0167] Therefore, the sixth adjacent regions Rf2 and Rf4 have low stiffness and are easily deformed. Consequently, when wearing the sanitary napkin 1, when the absorbent core 11 at the sixth rectangular region Rf presses against the lower abdomen, the sixth adjacent regions Rf2 and Rf4 bend, causing the absorbent core 11 to easily deform outwards in a convex shape along the roundness of the lower abdomen. Thus, even on the abdominal side, it is less likely for a gap to form between the absorbent core 11 and the wearer's lower abdomen, thus suppressing leakage of menstrual blood, etc. Furthermore, when the absorbent core 11 contracts in the left-right direction using the waist elastic member 23 on the abdominal side, it does not form disorderly wrinkles, but rather the sixth adjacent regions Rf2 and Rf4 easily bend. This promotes the convex deformation of the absorbent core 11, easily maintaining the absorbent core 11 in close contact with the lower abdomen.

[0168] In addition, such as Figure 3 , Figure 4 As shown in A, preferably, the absorbent body 10 has a length elastic member 17 that stretches in the length direction at a position closer to the non-skin side than the absorbent core 11. Figure 3The illustrated length elastic member 17 is an elastic band, and two length elastic members 17 arranged along the length direction are spaced apart in the left-right direction. However, the number of length elastic members 17 is not particularly limited. Alternatively, the length elastic member 17 can also be a sheet-like elastic member. Furthermore, as... Figure 4 As shown in Figure A, a length elastic member 17 is provided between the bottom piece 13 and the side piece 14.

[0169] When the sanitary napkin 1 has a length elastic member 17, such as Figure 7 As shown in Figure A, preferably, a length elastic member 17 is provided at least locally in the length direction of the first rectangular region Ra. Thus, the absorbent core 11 in the first rectangular region Ra is pushed upwards towards the skin by the contraction of the length elastic member 17, and the absorbent core 11 is pressed against the groove of the wearer's buttocks. At this time, the first adjacent regions Ra2 and Ra4, which are of low stiffness, bend, making it easy for the absorbent core 11 to deform convexly in a way that it fits tightly against the groove of the buttocks.

[0170] Furthermore, in sanitary napkin 1, it is preferred that it satisfies at least one of the following two structures. The first structure, such as... Figure 3 , Figure 4 As shown in Figure B, a cover sheet 34 is provided, which is disposed across the upper end (the end near the waist) of the portion of the absorbent body 10 located on the back side, and covers this end from the skin side. In the second structure, the first adjacent regions Ra2 and Ra4 in the first rectangular region Ra have a lower unit area weight of adhesive, but adhesive is provided at the upper end (the end near the waist). Furthermore, the upper end of the first rectangular region Ra refers to the uppermost end when the first rectangular region Ra is divided into five equal parts in the length direction. It is sufficient that at least a partial adhesive region 1R is provided at this upper end.

[0171] For example, in Figure 7 In section B, the upper ends of the first adjacent regions Ra2 and Ra4 do not have an adhesive region 1R. In this case, by providing a cover plate 34 on the back waist section 30, the upper end of the absorbent body 10 is less likely to roll up from the back waist section 30, thereby suppressing the situation that causes discomfort during wear.

[0172] On the other hand, such as Figure 10 As shown in B, in the modified example, the adhesive region 1R is continuously provided in the left-right direction from the first end region Ra1 on one side to the first end region Ra5 on the other side. Therefore, although the unit area weight of the adhesive is low in the first adjacent regions Ra2 and Ra4, since the adhesive is provided at the upper end, the upper end of the absorbent body 10 is not prone to curling even if the cover sheet 34 is not provided in the back waist part 30, thus suppressing the situation that causes discomfort during wearing.

[0173] In addition, such as Figure 1 and Figure 2 As shown, the following conditions are preferred in the sanitary napkin 1 in its natural state. Preferably, at the central position CL3 in the vertical direction between the upper end 10a of the absorbent body 10 and the lower end 2a of the side joint 2, the length W2 in the horizontal direction of the portion of the absorbent body 10 located on the back side is... Figure 2 It is shorter in the left-right direction than the ventral part of the absorbent body 10 (W2 < W1).

[0174] Therefore, in the natural state of the sanitary napkin 1, users who visually perceive that the portion of the absorbent body 10 located on the back side narrows in the left-right direction compared to the portion of the absorbent body 10 located on the abdomen side are more likely to perceive the sanitary napkin 1 as one that fits snugly against the buttocks. This can alleviate the user's anxiety about back leakage. Furthermore, to reduce the width of the portion of the absorbent body 10 located on the back side, it is preferable to increase the number of elastic members provided in the back waist portion 30 or to increase the elongation ratio of the elastic members.

[0175] ===Second Implementation Method===

[0176] Figure 13 A and Figure 13 B is an explanatory diagram of the bonding area 1R in the second embodiment. In the first embodiment described above, when the first rectangular area Ra ( Figure 7 A) When divided into five equal parts in the left and right directions, the adhesive has a lower unit area weight in the first adjacent regions Ra2 and Ra4 compared to the first end regions Ra1 and Ra5.

[0177] In the second embodiment, when the first rectangular region Ra( Figure 7 A) When the rectangle is divided into five equal parts in the left-right direction, the outermost first end regions Ra1 and Ra5 in the left-right direction have an adhesive region 1R. This is achieved by providing a non-adhesive region within the first rectangular region Ra (any part of regions Ra1 to Ra5) that is positioned inside the adhesive region 1R in the left-right direction. For example, in... Figure 13 In section B, a non-adhesive region is provided in the central region Ra3. Furthermore, the unit area weight of the adhesive in the first adjacent regions Ra2 and Ra4 can be the same as or greater than the unit area weight of the adhesive in the first end regions Ra1 and Ra5. Moreover, the first rectangular region Ra has a continuous and stretchable elastic member in the left-right direction. Figure 7 The waist elastic member 33 and the inclined elastic member 35 in A are preferred.

[0178] Therefore, the area with a stiffness difference between the adhesive area 1R of the first end region Ra1 and Ra5 and the non-adhesive area located inside the adhesive area 1R is prone to becoming a bending point, causing the absorbent core 11 to easily deform into a convex shape in a way that fits tightly against the groove of the wearer's buttocks. For example, in Figure 13 In case B, the junction between the non-adhesive area of ​​the central region Ra3 and the adhesive area 1R located in the first adjacent regions Ra2 and Ra4 becomes easier to bend. Furthermore, the elastic members 33 and 35 within the first rectangular region R1 facilitate the convex deformation of the absorbent core 11, and easily maintain the absorbent core 11 in close contact with the buttocks groove during wear. On the other hand, the increased stiffness of the first end region due to the adhesive area 1R allows for support of the convexly deformed portion of the absorbent core 11 from below, easily maintaining the absorbent core in close contact with the buttocks groove.

[0179] More preferably, the bonding area 1R of the first end regions Ra1 and Ra5 and the non-bonded area located inside them overlap in the vertical direction. This facilitates the formation of a bending start point.

[0180] Alternatively, although not shown in the figure, adhesive regions 1R may be provided in the first end regions Ra1 and Ra5, and adhesive regions 1R may also be provided in the first adjacent regions Ra2 and Ra4, with a non-adhesive region between the first end regions Ra1 and Ra5 and the first adjacent regions Ra2 and Ra4. In this case, the non-adhesive region at the junction of the first end regions Ra1 and Ra5 and the first adjacent regions Ra2 and Ra4 is likely to become the starting point of bending, making the absorbent core 11 easily deform into a convex shape in a way that fits tightly against the groove of the wearer's buttocks. Alternatively, in this case, similar to the first embodiment, the left and right widths of the bonding areas 1R of the first adjacent regions Ra2 and Ra4 can be made smaller than the left and right widths of the bonding areas 1R of the first end regions Ra1 and Ra5, thereby reducing the unit area weight of the adhesive in the first adjacent regions Ra2 and Ra4. Or, unlike the first embodiment, the left and right widths of the bonding areas 1R of the first adjacent regions Ra2 and Ra4 can be the same as or greater than the left and right widths of the bonding areas 1R of the first end regions Ra1 and Ra5, thereby increasing the unit area weight of the adhesive in the first adjacent regions Ra2 and Ra4.

[0181] ===Third Implementation Method===

[0182] In the third embodiment, such as Figure 13 As shown in B, in the first rectangular region Ra( Figure 7A) When the area is divided into five equal parts in the left-right direction, compared with the first end regions Ra1 and Ra5, the adhesive unit area weight of the adhesive that joins the back side waist portion 30 to the absorbent body 10 in the central region Ra3 should be lower. Figure 13 In B, the central region Ra3 becomes a non-adhesive region, but an adhesive region 1R with a lower unit area weight can also be provided in the central region Ra3 (the adhesive can be applied more thinly). Furthermore, the unit area weight of the adhesive in the first adjacent regions Ra2 and Ra4 can be the same as or greater than the unit area weight of the adhesive in the first end regions Ra1 and Ra5. Moreover, the first rectangular region Ra has a continuous and stretchable elastic member in the left-right direction. Figure 7 The waist elastic member 33 and the inclined elastic member 35 in A are preferred.

[0183] In this case, the central region Ra3 of the first rectangular region Ra has low stiffness and is easily deformed, so the absorbent core 11 easily deforms into a convex shape to fit snugly against the groove of the wearer's buttocks. Furthermore, when the absorbent core 11 contracts using the elastic members (33, 35) passing through the first rectangular region Ra, it promotes the convex deformation of the absorbent core 11 and easily maintains its close fit against the groove of the buttocks during wear. On the other hand, the first end regions Ra1, Ra5 have high stiffness and can support the convexly deformed portion of the absorbent core 11 from below, easily maintaining its close fit against the groove of the buttocks.

[0184] In particular, such as Figure 13 As shown in Figure B, when the entire central region Ra3 is a non-adhesive region, the entire central region Ra3 is easily deformable. Therefore, the absorbent core 11 in the central region Ra3 easily follows the shape of the buttock groove and its periphery, and is less likely to create gaps, thus suppressing the flow and leakage of menstrual blood. However, it is not limited to this; although not shown, the central region Ra3 may also have an adhesive region 1R. When the central region Ra3 has an adhesive region 1R, it is preferable that the adhesive region 1R overlaps with the central position in the left-right direction of the central region Ra3, and preferably that the two outer sides of the adhesive region 1R are non-adhesive regions. Thus, the adhesive region 1R of the central region Ra3 becomes the bending starting point, and the absorbent core easily folds to the left and right, easily entering the buttock groove.

[0185] In addition, such as Figure 13As shown in Figure B, the adhesive region 1R can also be provided in the same manner in the first end regions Ra1, Ra5 and the first adjacent regions Ra2, Ra4, while only the central region Ra3 becomes a non-adhesive region. In this case, a stiffness difference is generated between the central region Ra3 and the first adjacent regions Ra2, Ra4, and the junction of the central region Ra3 and the first adjacent regions Ra2, Ra4 easily becomes the starting point of bending. Therefore, the absorbent core 11 is easily folded to the left and right in the central part (central region Ra3) in the left-right direction, and the absorbent core 11 easily enters the groove of the buttocks and easily adheres tightly to the groove of the buttocks. In addition, in this case, since the adhesive region 1R is larger, the friction generated by the respective movements of the absorbent body 10 and the back waist part 30 can be suppressed, and the product can be prevented from breaking.

[0186] The embodiments of this utility model have been described above, but these embodiments are for ease of understanding and are not intended to limit the interpretation of this utility model. Furthermore, this utility model can be modified and improved without departing from its spirit, and its equivalents are naturally included.

[0187] Explanation of reference numerals in the attached figures

[0188] 1. Panty-style sanitary napkin; 2. Side joint; 3. Leak-proof wall; 10. Absorbent body; 11. Absorbent core; 12. Top sheet; 13. Bottom sheet; 14. Side sheet; 15. Core sheet; 16. Leak-proof elastic member; 17. Length elastic member; 20. Abdominal waist section; 21. Skin side sheet; 22. Non-skin side sheet; 23. Waist elastic member; 24. Cover sheet; 30. Back waist section; 31. Skin side sheet; 32. Non-skin side sheet; 33. Waist elastic member; 34. Cover sheet; 35. Inclined elastic member.

Claims

1. A panty-style sanitary napkin, comprising an absorbent body, an abdominal waist section, and a back waist section, wherein the absorbent body has an absorbent core. The ventral waist portion and the dorsal waist portion are joined into a ring shape by a pair of lateral joints, characterized in that... In the unfolded and elongated state This shorts-style sanitary napkin has mutually orthogonal length, left-right, and thickness directions. This shorts-style sanitary napkin has a rectangular area divided by a pair of imaginary lines: a first imaginary line, a second imaginary line, and a third imaginary line. The pair of first imaginary lines pass through the left and right ends of the portion of the absorbent core that overlaps with the dorsal waist portion in the thickness direction and extend along the length direction. The second imaginary line passes through the end of the absorbent core on the waist side of the portion that overlaps with the back waist portion in the thickness direction in the length direction and extends in the left-right direction. The third imaginary line bisects the length direction between the central position of the panty-style sanitary napkin and the lower crotch side end of the back portion of the side joint, and extends along the left-right direction. When the rectangular region is divided into five equal parts in the left-right direction, the adhesive unit area weight of the adhesive bonding the back side waist portion to the absorbent body is lower in the region adjacent to the outermost end region in the left-right direction compared to the outermost end region. The back side waist section has at least one elastic member that is continuous and expandable in the left-right direction within the rectangular region.

2. The shorts-type sanitary napkin according to claim 1, characterized in that, The back waist section is composed of separate components relative to the abdominal waist section.

3. The panty-type sanitary napkin according to claim 2, characterized in that, In the unfolded and elongated state This shorts-style sanitary napkin has a second rectangular area defined by the pair of first, fourth, and fifth imaginary lines. The fourth imaginary line passes through the lower crotch side end of the back portion of the side joint and extends in the left-right direction. The fifth imaginary line passes through the lower crotch side end of the back waist portion and extends in the left-right direction. When the second rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the region adjacent to the second end region on the inner side of the second end region in the left-right direction compared to the outermost second end region in the left-right direction. The back side waist section has at least one elastic member in the second rectangular region that is continuous in the left-right direction and expands and contracts in the left-right direction.

4. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, When the rectangular region is divided into five equal parts in the left-right direction, the three regions that are closer to the inside of the left-right direction than the end region have non-adhesive regions without the adhesive.

5. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state The panty-style sanitary napkin has a third rectangular area defined by the pair of first, second, and fourth imaginary lines. The fourth imaginary line passes through the lower crotch side end of the back portion of the side joint and extends in the left-right direction. When the third rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the region adjacent to the outermost third end region in the left-right direction compared to the outermost third end region. The back side waist section has at least one elastic member in the third rectangular region that is continuous in the left-right direction and expands and contracts in the left-right direction.

6. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion of the region adjacent to the end region that overlaps with the lateral joint in the length direction and the portion of the region closer to the crotch side than the lateral joint has an adhesive region with the adhesive and a non-adhesive region without the adhesive. The length of the non-adhesive region in the left-right direction is longer than the length of the adhesive region in the left-right direction.

7. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion of the region adjacent to the end region that overlaps with the lateral joint in the length direction and the portion of the region closer to the crotch side than the lateral joint has an adhesive region with the adhesive and a non-adhesive region without the adhesive. The length of the non-adhesive region in the left-right direction is shorter than the length of the adhesive region in the left-right direction.

8. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion of the region adjacent to the end region that overlaps with the lateral joint in the length direction and the portion of the region closer to the crotch side than the lateral joint is a non-adhesive region without adhesive in the entire region.

9. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion in the central region that overlaps with the lateral joint in the length direction and the portion closer to the crotch side than the lateral joint has an adhesive area with the adhesive and a non-adhesive area without the adhesive. The adhesive region overlaps with the central position of the central region in the left-right direction in the thickness direction, and the non-adhesive region is located on both outer sides of the adhesive region in the left-right direction.

10. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portion in the central region that overlaps with the lateral joint in the length direction and the portion that is closer to the crotch side than the lateral joint is a non-adhesive area without adhesive in the entire region.

11. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state When the rectangular region is divided into five equal parts in the left-right direction, at least one of the portions of the end regions and the central region that overlap with the lateral joint in the length direction and the portion closer to the crotch side than the lateral joint has an adhesive area provided with the adhesive. This shorts-style sanitary napkin meets at least one of the following two structural requirements: The length of the adhesive region in the left-right direction of the portion of the end region that overlaps with the lateral joint is longer than the length of the adhesive region in the left-right direction of the portion of the central region that overlaps with the lateral joint. The length in the left-right direction of the adhesive region in the end region that is closer to the crotch side than the lateral joint is longer than the length in the left-right direction of the adhesive region in the central region that is closer to the crotch side than the lateral joint.

12. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, A sloping telescopic region is provided in the portion of the back waist section that is lower than the side joint. This sloping telescopic region has a portion that slopes downwards from the two sides of the back waist section in the left-right direction toward the center portion, and a portion that extends along the left-right direction in the center portion. In the unfolded and elongated state This shorts-style sanitary napkin has a fourth rectangular area defined by a pair of first, sixth, and seventh imaginary lines. The sixth imaginary line passes through the waist-side end of the inclined stretchable area and extends in the left-right direction. The seventh imaginary line passes through the crotch-side end of the inclined stretchable area and extends in the left-right direction. When the fourth rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the region adjacent to the fourth end region in the left-right direction on the inner side of the fourth end region compared to the fourth end region located on the outermost side in the left-right direction.

13. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, The absorbent core has at least a narrowed portion that narrows inward in the left-right direction at the crotch area, and a maximum width portion with the greatest length in the left-right direction at a position closer to the back than the narrowed portion. In the unfolded and elongated state The shorts-style sanitary napkin has a fifth rectangular region defined by the pair of first, second, and eighth imaginary lines, the eighth imaginary line passing through the maximum width portion and extending in the left-right direction. When the fifth rectangular region is divided into five equal parts in the left-right direction, the adhesive has a lower weight per unit area in the region adjacent to the fifth end region on the inner side of the fifth end region in the left-right direction compared to the outermost fifth end region in the left-right direction. The back side waist section has at least one elastic member in the fifth rectangular region that is continuous in the left-right direction and expands and contracts in the left-right direction.

14. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, In the unfolded and elongated state This panty-style sanitary napkin has a sixth rectangular area divided by a pair of imaginary lines 9, 10, and 11. The pair of ninth imaginary lines pass through the left and right ends of the portion of the absorbent core that overlaps with the ventral waist portion in the thickness direction and extend along the length direction. The 10th imaginary line passes through the portion of the absorbent core that overlaps with the ventral waist portion in the thickness direction at one end of its length direction on the waist side and extends in the left-right direction. The 11th imaginary line bisects the length direction of the central position of the panty-style sanitary napkin with the lower crotch side end of the abdominal portion of the lateral joint, and extends along the left-right direction. When the sixth rectangular region is divided into five equal parts in the left-right direction, compared with the sixth end region located on the outermost side in the left-right direction, the adhesive unit area weight of the adhesive joining the ventral waist portion and the absorbent body is lower in the region adjacent to the sixth end region on the inner side in the left-right direction. The ventral waist portion has at least one ventral elastic member that is continuous in the left-right direction and stretches in the left-right direction in the sixth rectangular region.

15. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, The absorbent body has a length elastic member that stretches and extends in the length direction at a position closer to the non-skin side than the absorbent core. The length elastic member is provided at least locally in the length direction of the rectangular region.

16. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, This shorts-style sanitary napkin meets at least one of the following two structural requirements: A cover sheet is provided across the waist-side end of the back portion of the absorbent body and covers that end from the skin side; The adhesive is provided at the waist-side end of the adjacent area within the rectangular region.

17. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that, This shorts-style sanitary napkin has mutually orthogonal vertical, horizontal, and front-back directions. At the central position in the vertical direction between the upper end of the absorbent body and the lower end of the lateral joint, the length in the left-right direction of the dorsal portion of the absorbent body is shorter than the length in the left-right direction of the ventral portion of the absorbent body.

18. A panty-type sanitary napkin, comprising an absorbent body, a ventral waist section, and a back waist section, wherein the absorbent body has an absorbent core. The ventral waist portion and the dorsal waist portion are joined into a ring shape by a pair of lateral joints, characterized in that... In the unfolded and elongated state This shorts-style sanitary napkin has mutually orthogonal length, left-right, and thickness directions. This shorts-style sanitary napkin has a rectangular area divided by a pair of imaginary lines: a first imaginary line, a second imaginary line, and a third imaginary line. The pair of first imaginary lines pass through the left and right ends of the portion of the absorbent core that overlaps with the dorsal waist portion in the thickness direction and extend along the length direction. The second imaginary line passes through the end of the absorbent core on the waist side of the portion that overlaps with the back waist portion in the thickness direction in the length direction and extends in the left-right direction. The third imaginary line bisects the length direction between the central position of the panty-style sanitary napkin and the lower crotch side end of the back portion of the side joint, and extends along the left-right direction. When the rectangular region is divided into five equal parts in the left-right direction, the adhesive unit area weight of the adhesive that bonds the back side waist portion to the absorbent body is lower in the central region compared to the outermost end region in the left-right direction. The back side waist section has at least one elastic member that is continuous and expandable in the left-right direction within the rectangular region.

19. A panty-type sanitary napkin, comprising an absorbent body, a ventral waist section, and a dorsal waist section, wherein the absorbent body has an absorbent core. The ventral waist portion and the dorsal waist portion are joined into a ring shape by a pair of lateral joints, characterized in that... In the unfolded and elongated state This shorts-style sanitary napkin has mutually orthogonal length, left-right, and thickness directions. This shorts-style sanitary napkin has a rectangular area divided by a pair of imaginary lines: a first imaginary line, a second imaginary line, and a third imaginary line. The pair of first imaginary lines pass through the left and right ends of the portion of the absorbent core that overlaps with the dorsal waist portion in the thickness direction and extend along the length direction. The second imaginary line passes through the end of the absorbent core on the waist side of the portion that overlaps with the back waist portion in the thickness direction in the length direction and extends in the left-right direction. The third imaginary line bisects the length direction between the central position of the panty-style sanitary napkin and the lower crotch side end of the back portion of the side joint, and extends along the left-right direction. When the rectangular region is divided into five equal parts in the left-right direction, the outermost end region in the left-right direction has an adhesive region, which is provided with an adhesive to bond the back side waist portion to the absorbent body. A non-adhesive area is provided in the rectangular region, located inside the adhesive area in the left-right direction. This non-adhesive area is not provided with the adhesive. The back side waist section has at least one elastic member that is continuous and expandable in the left-right direction within the rectangular region.

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