Pants-type sanitary napkin and packaging body of pants-type sanitary napkin

Abstract

A pants-type sanitary napkin (1) is provided with: an absorbent main body (10) provided with an absorbent core (11); an abdomen-side waist part (20); and a back-side waist part (30) which is a separate member with respect to the abdomen-side waist part (20), and in the underpants-type sanitary napkin (1), when a menstrual blood dropping test is performed in which artificial menstrual blood is dropped to the central part in the longitudinal direction and in the left-right direction of the absorbent core (11) in an expanded and stretched state, the back-side waist part (30) is attached to the back-side waist part (30). The thickness of the center portion of the underpants-type sanitary napkin (1) after the test is smaller than the thickness of the center portion of the underpants-type sanitary napkin (1) before the test is performed.

Description

Technical Field

[0001] The present invention relates to a short-pant type sanitary napkin and a package thereof. Background Art

[0002] Patent Document 1 discloses an adult-use pant type wearing article, which includes a front waist sheet forming a front waist region, a rear waist sheet forming a rear waist region, and an absorbent sheet having an absorber. Since this pant type wearing article is targeted at adult mild incontinence diapers, the water retention capacity of the absorber is 150 to 400 g. In order to enable the user to wear it without resistance (not being aware of wearing a diaper) while ensuring this water retention capacity, as the liquid-absorbing core, examples of the liquid-absorbing core include a liquid-absorbing core containing wood pulp fluff and superabsorbent polymer particles (SAP), and a liquid-absorbing core formed only of SAP, such as a slender absorbent core.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-47148 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] On the other hand, for a short-pant type sanitary napkin, it is desired to closely adhere to the wearer's excretion opening and the groove of the buttocks to suppress the leakage of menstrual blood. In addition, the main use of the short-pant type sanitary napkin is to absorb menstrual blood. Compared with the urine absorbed by the diaper as in Patent Document 1, menstrual blood has a higher viscosity, has a tendency to spread easily on the surface sheet, and the excretion amount is less. Therefore, if the diaper of Patent Document 1 is directly used as a short-pant type sanitary napkin, there are the following problems: the liquid-absorbing core swells due to the SAP that has absorbed the excreted liquid (menstrual blood, sweat, etc.), and it is easy to form irregularities on the side of the skin, resulting in a decrease in the close adhesion to the wearer and an easy leakage along the skin.

[0008] The present invention has been completed in view of the above-mentioned conventional problems, and an object thereof is to provide a short-pant type sanitary napkin that can easily maintain a state of closely adhering to the wearer's excretion opening, the groove of the buttocks, etc. even after absorbing excreted liquids such as menstrual blood and sweat.

[0009] Means for Solving the Problems

[0010] The main invention for achieving the above object is a short-pant type sanitary napkin, which has: an absorbent body having an absorbent core containing water-retaining fibers; a ventral waist portion; and a dorsal waist portion which is formed as a separate member with respect to the ventral waist portion, and is characterized in that, in the unfolded and elongated state, the short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other. When a menstrual blood dripping test is performed by dripping artificial menstrual blood onto the central portion in the length direction and the left-right direction of the absorbent core, the thickness of the central portion of the short-pant type sanitary napkin after the menstrual blood dripping test is smaller than the thickness of the central portion of the short-pant type sanitary napkin before the menstrual blood dripping test.

[0011] Other features of the present invention are clarified by the description in this specification and the drawings.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide a short-pant type sanitary napkin that can easily maintain a state of being closely attached to the excretory opening of the wearer, the groove of the buttocks, etc. even after absorbing excretory fluids such as menstrual blood and sweat. Description of the Drawings

[0014] Figure 1 is a front view of the short-pant type sanitary napkin 1.

[0015] Figure 2 is a top view of the short-pant type sanitary napkin 1 in the unfolded and elongated state as observed from the skin side.

[0016] Figure 3 of Figure 3 A is Figure 2 a schematic cross-sectional view at the first center line CL1 of Figure 3 B is Figure 2 a schematic cross-sectional view at the second center line CL2 of

[0017] Figure 4 is a partial view of a top view showing the unfolded and elongated state of the short-pant type sanitary napkin 1 of a modified example.

[0018] Figure 5 is a view for explaining the menstrual blood dripping test and the saline dripping test.

[0019] Figure 6 is an explanatory view of the narrowed portion 11D of the absorbent core 11.

[0020] Figure 7 is a side view of the state in which the short-pant type sanitary napkin 1 is folded.

[0021] Figure 8 is a front view of the package 50 of the short-pant type sanitary napkin 1.

[0022] Figure 9 of Figure 9 A and Figure 9 B are the front views of the packages 60 and 70 of the short-pant-type sanitary napkin 1 in the modified examples. DETAILED DESCRIPTION

[0023] According to the description of the present specification and the drawings, at least the following matters are clarified.

[0024] (Technical Solution 1)

[0025] A short-pant-type sanitary napkin having: an absorbent body having an absorbent core containing water-retaining fibers; a ventral waist portion; and a dorsal waist portion formed as a separate member with respect to the ventral waist portion, characterized in that in the unfolded and elongated state, the short-pant-type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other, and in the case of performing a menstrual blood dripping test of dripping artificial menstrual blood in the length direction of the absorbent core and at the central portion in the left-right direction, the thickness of the central portion of the short-pant-type sanitary napkin after the menstrual blood dripping test is smaller than the thickness of the central portion of the short-pant-type sanitary napkin before the menstrual blood dripping test.

[0026] The short-pant-type sanitary napkin according to Technical Solution 1 has good air permeability compared to, for example, a case where an integral outer package member is provided continuously from the ventral waist portion to the dorsal waist portion. In addition, since the ventral waist portion and the dorsal waist portion are separated, when lifting the sanitary napkin during wearing, the lifting force is likely to be concentrated on the joint portion between each waist portion and the absorbent body, and the absorbent body is likely to closely adhere to the crotch portion of the wearer. In addition, even during wearing, compared with an integral outer package member, the absorbent body is less affected by the movement of the body at the waist, so it is easy to maintain the adhered state. In addition, at the central portion of the sanitary napkin where it abuts against the excretory opening of the wearer, the thickness does not expand after absorbing menstrual blood, so it is possible to suppress the formation of unevenness on the side of the skin, and it is easy to maintain the state where the sanitary napkin closely adheres to the excretory opening of the wearer. As a result, it is possible to suppress the flow of menstrual blood along the gap generated between the wearer and the sanitary napkin.

[0027] (Technical Solution 2)

[0028] A short-pant type sanitary napkin having: an absorbent body including an absorbent core containing water-retaining fibers; a ventral waist portion; and a dorsal waist portion formed as a separate member with respect to the ventral waist portion, characterized in that, in the unfolded and extended state, the short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other. When a saline dropping test is performed by dropping physiological saline onto a dorsal central portion that is the central portion in the left-right direction and the length direction in a dorsal region obtained by trisecting the absorbent core in the length direction, the thickness of the dorsal central portion of the short-pant type sanitary napkin after the saline dropping test is less than the thickness of the dorsal central portion of the short-pant type sanitary napkin before the saline dropping test.

[0029] Compared with, for example, a case where an integral outer package member continuous from the ventral waist portion to the dorsal waist portion is provided, the short-pant type sanitary napkin according to Technical Solution 2 has good air permeability. In addition, since the ventral waist portion and the dorsal waist portion are separated, when lifting the sanitary napkin during wearing, the lifting force is likely to concentrate on the joint portion between each waist portion and the absorbent body, and the absorbent body is likely to closely adhere to the groove of the wearer's buttocks. Also, during wearing, compared with the integral outer package member, the absorbent body is less affected by the body movement of the waist, so it is easy to maintain the adhered state. In addition, compared with the ventral part of the wearer, the dorsal part is more likely to sweat, especially when lying on the back, but since the thickness of the dorsal central portion does not expand after absorbing sweat (physiological saline), it is easy to maintain the state where the sanitary napkin closely adheres to the groove portion of the wearer's buttocks (the state of entering the groove portion of the wearer's buttocks). As a result, it is possible to suppress the leakage of menstrual blood along the groove of the buttocks.

[0030] (Technical Solution 3)

[0031] A short-pant type sanitary napkin having: an absorbent body including an absorbent core containing water-retentive fibers; a ventral waist portion; and a dorsal waist portion formed as a separate member with respect to the ventral waist portion, characterized in that in an unfolded and elongated state, the short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other. When a menstrual blood dripping test is performed by dripping artificial menstrual blood onto the central portion in the length direction and the left-right direction of the absorbent core, the thickness of the central portion of the short-pant type sanitary napkin after the menstrual blood dripping test is smaller than the thickness of the central portion of the short-pant type sanitary napkin before the menstrual blood dripping test. When a saline dripping test is performed by dripping physiological saline onto the dorsal central portion, which is the central portion in the length direction and the left-right direction in the dorsal region when the absorbent core is trisected in the length direction, the thickness of the dorsal central portion of the short-pant type sanitary napkin after the saline dripping test is smaller than the thickness of the dorsal central portion of the short-pant type sanitary napkin before the saline dripping test.

[0032] Compared with, for example, a case where an integrated outer member is provided continuously from the ventral waist portion to the dorsal waist portion, the short-pant type sanitary napkin according to Technical Solution 3 has good air permeability. In addition, since the ventral waist portion and the dorsal waist portion are separated, when the sanitary napkin is lifted during wearing, the lifting force is likely to be concentrated on the joint portion between each waist portion and the absorbent body, and the absorbent body is likely to closely adhere to the crotch portion and the groove portion of the buttocks of the wearer. Also, during wearing, compared with the integrated outer member, the absorbent body is less affected by the movement of the body at the waist, so it is easy to maintain the adhered state.

[0033] In addition, in the central portion of the sanitary napkin that abuts against the excretory opening of the wearer, the thickness does not expand after absorbing menstrual blood, so it is possible to suppress the formation of unevenness on the side of the skin and easily maintain the state where the sanitary napkin closely adheres to the excretory opening of the wearer. As a result, it is possible to suppress the flow of menstrual blood along the gap generated between the wearer and the sanitary napkin.

[0034] In addition, compared with the ventral portion of the wearer, the dorsal portion is more likely to sweat, especially when lying on the back in a supine position. However, since the thickness of the dorsal central portion does not expand after absorbing sweat (physiological saline), it is easy to maintain the state where the sanitary napkin closely adheres to the groove portion of the buttocks of the wearer (the state of entering the groove portion of the buttocks of the wearer). As a result, it is possible to suppress the leakage of menstrual blood along the groove of the buttocks.

[0035] (Technical Solution 4)

[0036] The panty-type sanitary napkin according to any one of Technical Solutions 1 to 3, wherein in a region between the ventral waist portion and the dorsal waist portion in an unfolded and elongated state, no elastic member is present at a position outside the absorbent body in the left-right direction.

[0037] In the panty-type sanitary napkin according to Technical Solution 4, at a portion where the leg circumference of the wearer abuts, no elastic member is present at a position outside the absorbent body in the left-right direction, and the components do not cling, so that discomfort around the leg circumference can be reduced and breathability is also improved.

[0038] (Technical Solution 5)

[0039] The panty-type sanitary napkin according to any one of Technical Solutions 1 to 4, wherein the absorbent core has a narrowed portion that narrows inward in the left-right direction in the crotch portion of the panty-type sanitary napkin that is located at the crotch of the wearer when worn. In an unfolded and elongated state, the total weight of the water-retaining fibers is larger in the dorsal region than in the central region when the absorbent core is divided into three equal parts in the length direction.

[0040] The panty-type sanitary napkin according to Technical Solution 5 can reduce the discomfort of the wearer when clamping the absorbent core with the legs. In addition, by making the total weight of the water-retaining fibers in the dorsal region larger, it is possible to reliably absorb sweat generated in the dorsal portion and menstrual blood flowing to the rear side. In addition, by making the width of the absorbent core in the dorsal portion wider, a sense of security can be given to the wearer who is worried about back leakage.

[0041] (Technical Solution 6)

[0042] The panty-type sanitary napkin according to any one of Technical Solutions 1 to 5, wherein the absorbent core has a narrowed portion that narrows inward in the left-right direction in the crotch portion of the panty-type sanitary napkin that is located at the crotch of the wearer when worn. The narrowed portion and regions adjacent to the two outer sides of the narrowed portion in the left-right direction have superabsorbent polymers, and the total weight of the superabsorbent polymers is smaller in the adjacent regions than in the narrowed portion.

[0043] The panty-type sanitary napkin according to Technical Solution 6 can reduce the discomfort (foreign body sensation) of the wearer when clamping the absorbent core with the legs. In the narrowed portion where the excretion port abuts, it is possible to reliably absorb and retain menstrual blood by using superabsorbent polymers with a larger total weight. In addition, it is possible to absorb sweat around the leg circumference by using superabsorbent polymers with a smaller total weight in the regions adjacent to the narrowed portion and prevent discomfort around the leg circumference caused by the swelling of the superabsorbent polymers.

[0044] (Technical Solution 7)

[0045] The underpants-type sanitary napkin according to any one of claims 1 to 6, wherein the absorbent core does not contain a highly water-absorbent polymer.

[0046] According to the shorts-type sanitary napkin described in Technical Solution 7, the highly absorbent polymer will not swell after absorbing excreta (menstrual blood, sweat), and it is not easy to form bumps on the side of the skin after the sanitary napkin absorbs the excreta, so it is easy to keep the sanitary napkin in close contact with the wearer.

[0047] (Technical Solution 8)

[0048] The shorts-type sanitary napkin according to any one of technical solutions 1 to 7 is characterized in that the absorbent body has a liquid-permeable surface sheet, and when the ventral waist portion and the dorsal waist portion located on the outside of the absorbent body in the left-right direction are folded in the left-right direction with the ventral side becoming the inside, the surface sheet can be visually identified from the leg opening.

[0049] According to the shorts-type sanitary napkin described in technical solution 8, the pair of leg openings are not covered by the rear waist portion, so that an air passage is formed to connect the outside and the inside of the sanitary napkin, and moisture is not easily accumulated inside the sanitary napkin, thereby ensuring the comfort of wearing the sanitary napkin.

[0050] (Technical Solution 9)

[0051] The shorts-type sanitary napkin according to any one of Technical Solutions 1 to 6 and Technical Solution 8 is characterized in that the absorbent core has a highly absorbent polymer, and the crotch portion of the shorts-type sanitary napkin located at the wearer's crotch when worn has a narrowing portion narrowing inward in the left-right direction, the narrowing portion has a narrowest portion with the shortest length in the left-right direction, and the highly absorbent polymer has a lower unit area weight than a portion of the absorbent core that overlaps with the narrowest portion in the left-right direction.

[0052] According to the shorts-type sanitary napkin described in technical solution 9, the discomfort (foreign body sensation) of the wearer when the absorbent core is clamped between the legs can be reduced. In addition, the portion overlapping with the narrowest portion in the left-right direction and abutting against the excretion opening can reliably absorb and retain the excremental fluid using the super absorbent polymer with a large unit area weight. On the other hand, at the four corners of the absorbent core that are closer to the outside than the narrowest portion, the formation of unevenness caused by the swelling of the super absorbent polymer can be suppressed, and the absorbent core inside can be stably supported, making it easy to maintain the close contact state of the absorbent core.

[0053] (Technical Solution 10)

[0054] The panty-type sanitary napkin according to any one of Technical Solutions 1 to 6 and Technical Solutions 8 to 9, wherein the absorbent body has a liquid-permeable surface sheet, and each of the ventral waist portion and the dorsal waist portion has a skin-side sheet, a non-skin-side sheet, and a waist elastic member that is stretchable in the left-right direction and disposed between the skin-side sheet and the non-skin-side sheet. The absorbent core has a superabsorbent polymer. Compared with the skin-side sheet, the surface sheet has a larger unit area weight and thickness, and the total weight of the superabsorbent polymer included in the absorbent core is lighter than the total weight of the surface sheet.

[0055] In the panty-type sanitary napkin according to Technical Solution 10, compared with the case where the unit area weight and thickness of the surface sheet are smaller than those of the skin-side sheet, the skin touch and cushioning property of the surface sheet are improved. Therefore, for a wearer who is overly sensitive around the vaginal orifice during menstruation, the wearing comfort of the surface sheet is improved. On the other hand, by suppressing the total weight of the superabsorbent polymer, the water retention amount of the absorbent body does not increase unnecessarily, and the total weight of the absorbent body can be reduced. Thus, sagging caused by the self-weight of the absorbent body can be suppressed, and it is easy to maintain the state where the sanitary napkin is closely attached to the wearer.

[0056] (Technical Solution 11)

[0057] The panty-type sanitary napkin according to any one of Technical Solutions 1 to 6 and Technical Solutions 8 to 10, wherein the surface of the absorbent core is covered with a liquid-permeable core wrap sheet, and the absorbent core has a superabsorbent polymer, and the combined weight of the core wrap sheet and the absorbent core is lighter than half the weight of the panty-type sanitary napkin.

[0058] In the panty-type sanitary napkin according to Technical Solution 11, the weight of the core wrap sheet and the absorbent core that affect the water retention amount of the absorbent body is suppressed, the water retention amount of the absorbent body does not increase unnecessarily, and the total weight of the absorbent body can be reduced. Thus, sagging caused by the self-weight of the absorbent body can be suppressed, and it is easy to maintain the state where the sanitary napkin is closely attached to the wearer.

[0059] (Technical Solution 12)

[0060] A package of a panty-type sanitary napkin, which includes a package and the panty-type sanitary napkin according to any one of Technical Solutions 1 to 11, wherein the package of the panty-type sanitary napkin has a longitudinal direction and a lateral direction that are orthogonal to each other, the package is folded in a manner of internally packaging the panty-type sanitary napkin, at least one of a pair of side end portions in the lateral direction of the opposing packages is discontinuously joined, and the left-right direction of the panty-type sanitary napkin internally packaged in the package is along the lateral direction.

[0061] In the package of the short-pant type sanitary napkin according to Technical Solution 12, a pair of leg opening portions at both side portions in the left-right direction of the sanitary napkin and the intermittent joint portions of the package are arranged in the lateral direction (left-right direction) to form an air passage. Therefore, it is not easy for moisture to accumulate inside the sanitary napkin and inside the package, ensuring the comfort when wearing the sanitary napkin.

[0062] (Technical Solution 13)

[0063] A package of a short-pant type sanitary napkin includes a packaging member and the short-pant type sanitary napkin according to any one of Technical Solutions 1 to 11. It is characterized in that the package of the short-pant type sanitary napkin has a longitudinal direction and a lateral direction that are orthogonal to each other. The packaging member is folded in a manner that encloses the short-pant type sanitary napkin, and at least one of the pair of side end portions in the lateral direction of the opposing packaging members is intermittently joined. The left-right direction of the short-pant type sanitary napkin enclosed in the packaging member is along the longitudinal direction.

[0064] In the package of the short-pant type sanitary napkin according to Technical Solution 13, a pair of leg opening portions at both side portions in the left-right direction of the sanitary napkin and the intermittent joint portions of the package are not arranged along the same direction. Therefore, the outside air that enters the inside of the package through the intermittent joint portions is not easy to pass through the leg opening portions of the sanitary napkin and is not easy to come into contact with the inside (skin side) of the sanitary napkin. Thus, the sanitary napkin can be hygienically stored until the package is opened.

[0065] ===Embodiment===

[0066] <<Basic Structure of Short-Pant Type Sanitary Napkin 1>>

[0067] Figure 1 is the front view of the short-pant type sanitary napkin 1. Figure 2 is the top view of the short-pant type sanitary napkin 1 in the unfolded and extended state as observed from the skin side. Figure 3 A is Figure 2 a schematic cross-sectional view at the first center line CL1 of Figure 3 B is Figure 2 a schematic cross-sectional view at the second center line CL2 of Figure 4 is a partial view of the top view of the short-pant type sanitary napkin 1 in the unfolded and extended state showing a modified example. In the following description, the short-pant type sanitary napkin is also simply referred to as "sanitary napkin". In addition, the first center line CL1 is a line extending in the left-right direction at 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 at the center point that bisects the product in the left-right direction.

[0068] The unfolded state of the short-pant type sanitary napkin 1 means a state in which a pair of side joining parts 2 provided on both side parts of the sanitary napkin 1 are separated, and the sanitary napkin 1 is opened and laid flat.

[0069] The elongated state of the short-pant type sanitary napkin 1 means a state in which the sanitary napkin 1 is elongated to such an extent that wrinkles of the sanitary napkin 1 cannot be visually recognized. Specifically, the elongated state means a state in which the dimensions of the respective members constituting the sanitary napkin 1 become the same as or close to the dimensions of the members alone.

[0070] The short-pant type sanitary napkin 1 has a vertical direction, a horizontal direction, and a front-back direction that are orthogonal to each other, and has a waist opening BH and a pair of leg openings LH. The upper side in the vertical direction corresponds to the side of the waist opening BH, and the lower side corresponds to the crotch side. The front side in the front-back direction corresponds to the ventral side of the wearer, and the back side corresponds to the dorsal side of the wearer. In addition, as Figure 3 A, Figure 3 as shown in B, the direction in which the components constituting the sanitary napkin 1 are stacked is defined as the thickness direction. The side that contacts the skin of the wearer in the thickness direction is defined as the skin side, and the opposite side is defined as the non-skin side.

[0071] In addition, the short-pant type sanitary napkin 1 has an absorbent main body 10, a ventral waist part 20 that covers the ventral part of the wearer, and a dorsal waist part 30 that covers the dorsal part of the wearer. As Figure 2 shown, the short-pant type sanitary napkin 1 has a length direction, a horizontal direction, and a thickness direction that are orthogonal to each other in the unfolded state. The length direction in the unfolded state corresponds to the vertical direction in the short-pant state.

[0072] In the unfolded sanitary napkin 1, the ventral waist part 20 and the dorsal waist part 30 are positioned in a state of being arranged at intervals in the length direction, and the absorbent main body 10 is installed along the length direction between the ventral waist part 20 and the dorsal waist part 30. Each end part in the length direction of the absorbent main body 10 is joined and fixed to the skin side of the closest part of the ventral waist part 20 or the dorsal waist part 30. From this state, the absorbent main body 10 is folded in half in the length direction, and the left and right side parts of the ventral waist part 20 and the dorsal waist part 30 facing each other are connected by a pair of side joining parts 2 to form the short-pant type sanitary napkin 1. In addition, as a joining method using the side joining part 2, heat welding, ultrasonic welding, a joining method using an adhesive, etc. can be exemplified.

[0073] The absorbent body 10 has: an absorbent core 11 that absorbs and retains excreted fluids such as menstrual blood; a liquid-permeable surface sheet 12 (e.g., non-woven fabric, perforated film, etc.) disposed on the skin side of the absorbent core 11; a liquid-impermeable backsheet 13 (e.g., resin film, etc.) disposed on the non-skin side of the absorbent core 11; and side sheets 14 (e.g., hydrophobic non-woven fabric, etc.). Additionally, the outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable core wrap sheet 15 such as tissue paper or non-woven fabric.

[0074] On both side portions of the absorbent body 10 in the left-right direction, a pair of leak-preventing wall portions 3 are provided along the length direction of the absorbent body 10. The leak-preventing wall portions 3 are formed by the side sheets 14. Specifically, the portions of the side sheets 14 that cover the non-skin side surface of the backsheet 13 and extend outward to both sides in the left-right direction are bent at multiple locations and are provided on both side portions in the left-right direction on the skin side surface of the surface sheet 12, thereby forming the leak-preventing wall portions 3. A leak-preventing wall elastic member 16 (e.g., elastic cord) is installed in a state of extending along the length direction in the leak-preventing wall portions 3. Due to the stretchability of the leak-preventing wall elastic member 16, the leak-preventing wall portions 3 stand up toward the skin side of the wearer.

[0075] The ventral waist portion 20 and the dorsal waist portion 30 each include skin side sheets 21, 31, non-skin side sheets 22, 32 laminated at positions on the non-skin side of the skin side sheets 21, 31, and a plurality of waist elastic members 23, 33 (e.g., elastic cords) that stretch in the left-right direction. Between the skin side sheets 21, 31 and the non-skin side sheets 22, 32, the plurality of waist elastic members 23, 33 are arranged and configured in the up-down direction and are installed in a state of being stretched in the left-right direction. The ventral waist portion 20 and the dorsal waist portion 30 are attached to the waist of the wearer by the stretchability of the waist elastic members 23, 33.

[0076] Additionally, covering sheets 24, 34 may be provided in a manner of covering the upper end portion of the absorbent body 10 from the skin side. As the covering sheets 24, 34, for example, soft non-woven fabric, etc. can be exemplified. By using the covering sheets 24, 34, it is possible to prevent the upper end edge of the absorbent body 10 from digging into the skin of the wearer and to prevent the opening of the absorbent body 10.

[0077] Additionally, as Figure 2As shown, the planar shapes of the ventral waist portion 20 and the dorsal waist portion 30 in the unfolded and extended state are different. The length of the ventral waist portion 20 in the up-down direction is approximately the same as that of the side joint portion 2, and the ventral waist portion 20 has a rectangular shape that is longer in the left-right direction. The dorsal waist portion 30 has a waist side portion 30A with a rectangular shape that overlaps with the ventral waist portion 20 and a lower crotch side portion 30B with a substantially trapezoidal shape that extends to a position lower than the waist side portion 30A (lower than the side joint portion 2). In the lower crotch side portion 30B, the lateral width becomes wider from the lower side toward the upper side, so that the lower crotch side portion 30B can cover the wearer's buttocks. Therefore, it is possible to reduce the uneasiness of the wearer about whether side leakage occurs on the buttocks side.

[0078] In addition, an inclined elastic member 35 (such as an elastic cord) is provided at the lower end portion of the dorsal waist portion 30 (the portion from the lower end portion of the side joint portion 2 to the lower crotch side portion 30B). The inclined elastic member 35 is arranged so as to substantially follow the lower outer edge of the dorsal waist portion 30, and has a portion that inclines downward from the left and right side portions of the dorsal waist portion 30 toward the central portion and a portion that extends in the left-right direction at the central portion of the dorsal waist portion 30. The inclined elastic member 35 is also installed in an extended state between the skin side sheet 31 and the non-skin side sheet 32. By using the stretchability of the inclined elastic member 35, the lower crotch side portion 30B of the dorsal waist portion 30 can easily fit to the wearer's buttocks and is not easily curled up from the buttocks. In addition, in Figure 2 As the inclined elastic member 35, three elastic cords are exemplified, but the number of elastic cords is not particularly limited. In addition, the inclined elastic member 35 may also be a sheet-like elastic member (such as stretchable non-woven fabric, stretchable film, etc.).

[0079] The basic structure of the sanitary napkin 1 has been described above, but the structure of the above-mentioned sanitary napkin 1 is an example and is not limited thereto.

[0080] For example, a liquid-permeable intermediate sheet may be provided between the surface sheet 12 and the core package sheet 15.

[0081] In addition, the dorsal waist portion 30 may not have the lower crotch side portion 30B and the inclined elastic member 35, and may have the same planar shape as the ventral waist portion 20, and the ventral waist portion 20 may also have a portion that extends downward to the crotch side.

[0082] In addition, as Figure 4 In the sanitary napkin 1 of the modified example shown, instead of some linear waist elastic members 23 and 33, a stretchable sheet may be arranged between the skin side sheets 21 and 31 and the non-skin side sheets 22 and 32, and the stacked sheets may be intermittently joined. In this case, the ventral waist portion 20 and the dorsal waist portion 30 also exhibit stretchability and fit to the wearer's waist.

[0083] In addition, asFigure 4 Similar to the sanitary napkin 1 of the illustrated modification example, the length ratio of the portion of the dorsal waist portion 30 that extends outward in the left - right direction beyond the inclined elastic member 35 Figure 1 、 Figure 2 may also be shorter than the length of the sanitary napkin 1 of the illustrated example.

[0084] <<Regarding the Fit of the Pant - type Sanitary Napkin 1>>

[0085] In the pant - type sanitary napkin 1 of the present embodiment, the ventral waist portion 20 and the dorsal waist portion 30 are formed as separate members. Therefore, in the pant - type sanitary napkin 1 in the unfolded and stretched state ( Figure 2 ), the ventral waist portion 20 and the dorsal waist portion 30 are separated from each other at an interval in the length direction.

[0086] Thus, compared with the case where a single outer package member continuous from the ventral waist portion to the dorsal waist portion (for example, an outer package member having a substantially hourglass - shaped planar shape) is provided on the non - skin side of the absorbent body 10, which is different from the present embodiment, the air permeability of the absorbent body 10 is good and the wearing comfort is good. In addition, since the ventral waist portion 20 and the dorsal waist portion 30 are separated, when lifting the sanitary napkin 1 during wearing, the lifting force is likely to concentrate on the joint portion between each waist portion (20, 30) and the absorbent body 10, and the absorbent body 10 is easily brought into close contact with the crotch portion and the groove portion of the buttocks of the wearer. Also during wearing, compared with the integral outer package member, the absorbent body 10 is less affected by the movement of the body at the waist, so it is easy to maintain the fitting state.

[0087] In addition, the main use of the pant - type sanitary napkin 1 is to absorb menstrual blood. Compared with the urine absorbed by a diaper, the viscosity of menstrual blood is higher and the excretion amount discharged to the sanitary napkin 1 is less (the excretion amount of menstrual blood is less than that of urine). Therefore, in the sanitary napkin 1, the absorbent core 11 is not likely to sag due to its own weight even after absorbing the excreted liquid. Even without being supported by an outer package member continuous from the ventral waist portion to the dorsal waist portion, the absorbent body 10 can maintain a state of being in close contact with the wearer. As a result, it is possible to suppress the leakage of menstrual blood, which has a higher viscosity than urine and is likely to spread on the surface sheet, from flowing along the gap generated between the sanitary napkin and the wearer.

[0088] Furthermore, preferably, there is no outer package member connecting the ventral waist portion 20 and the dorsal waist portion 30, which are separate members, in the crotch portion, and the non - skin side surface of the absorbent body 10 is exposed in the crotch portion. Thereby, the air permeability of the absorbent body 10 is further improved. In addition, in the crotch portion of the sanitary napkin 1, there are no components on the outer sides in the left - right direction of the absorbent body 10, so the discomfort around the leg circumference is reduced, the wearing comfort is good, and the wearer can easily move the legs.

[0089] In addition, asFigure 2 As shown, preferably, in the region (lower crotch portion 1B) between the ventral waist portion 20 and the dorsal waist portion 30 in the unfolded and extended state, there is no elastic member at a position outside the absorbent body 10 in the left-right direction.

[0090] In this case, in the leg circumference of the wearer (lower crotch portion 1B), since there is no elastic member, even if there are components at a position outside the absorbent body 10 in the left-right direction, the components will not closely adhere to the leg circumference of the wearer (lower crotch portion 1B). Thus, the discomfort in the leg circumference is alleviated, the wearing comfort is good, the wearer can easily move the legs, and the breathability of the leg circumference is also improved. In addition, the amount of menstrual blood excreted into the sanitary napkin 1 is less than the amount of urine excreted into the diaper. Therefore, even without the above elastic member, the possibility of menstrual blood leakage from the leg circumference is small, which helps to reduce components (low cost).

[0091] In addition, in the lower crotch portion 1B of the sanitary napkin 1, if there are components or elastic members at a position outside the absorbent body 10 in the left-right direction, the adhesion at the outside in the left-right direction of the absorbent body 10 is improved, but the central portion in the left-right direction of the absorbent body 10 is difficult to be pressed against the skin side due to the elastic member or the like. Therefore, by not providing an elastic member at a position outside the absorbent body 10 in the left-right direction, it is possible to suppress the leakage caused by the sagging of the sanitary napkin 1 near the vaginal opening. In addition, although there is no elastic member in the present embodiment, an elastic member extending in the length direction may be provided at a position on the non-skin side of the absorbent core 11 in the central portion in the left-right direction of the absorbent body 10. Thereby, the adhesion to the vaginal opening can be made better.

[0092] Figure 5 It is a diagram for explaining the menstrual blood dripping test and the saline dripping test.

[0093] Moreover, in the panty-type sanitary napkin 1 of the present embodiment, in the unfolded and extended state ( Figure 5 ), in the case of performing a menstrual blood dripping test in which artificial menstrual blood is dripped onto the central portion R1 in the length direction and the left-right direction of the absorbent core 11, the thickness of the central portion R1 of the panty-type sanitary napkin 1 after the menstrual blood dripping test is smaller than the thickness of the central portion R1 of the panty-type sanitary napkin 1 before the menstrual blood dripping test.

[0094] In the menstrual blood dripping test, imagining the actual use scenario of the sanitary napkin 1, artificial menstrual blood is dripped onto the central portion R1 in the length direction and the left-right direction of the absorbent core 11 that abuts against the excretion port (vaginal opening) of the wearer. As a result of the applicant's research, the amount of the dripped artificial menstrual blood is also set to 10 ml, which is the average amount discharged into the sanitary napkin 1.

[0095] In contrast to this embodiment, for a sanitary napkin in which the thickness of the central portion R1 increases after the menstrual blood dripping test, unevenness is likely to form on the skin side after absorbing menstrual blood. This is considered because, compared with the case where the space between the water-retaining fibers becomes smaller due to the absorption of menstrual blood and the thickness becomes thinner, in the case where the space between the water-retaining fibers expands or the superabsorbent polymer swells due to the absorption of menstrual blood and the thickness increases, the change pattern (expansion pattern) of the thickness is more likely to deviate due to various reasons (distribution of the constituent materials of the absorbent core 11, degree of diffusion of menstrual blood, etc.). In addition, it is considered that the unevenness (thickness difference) also increases due to the increase in thickness.

[0096] In contrast, in the sanitary napkin 1 of the present embodiment, the expansion of the central portion R1 after the menstrual blood dripping test is suppressed, and the thickness is thinned. Therefore, even after absorbing menstrual blood, it is possible to avoid the formation of unevenness on the skin side of the sanitary napkin 1 at the excretory opening abutting position and its peripheral portion. Thus, it is easy to maintain the state where the sanitary napkin 1 is closely attached to the excretory opening of the wearer and its peripheral portion. As a result, it is possible to suppress the leakage of menstrual blood flowing along the gap generated between the sanitary napkin and the wearer.

[0097] Here, the method of the "menstrual blood dripping test" will be described.

[0098] (1) First, tear open the side joint portion 2 of the panty-type sanitary napkin 1 to be measured, fix the sanitary napkin 1 in an unfolded and elongated state with the skin side facing upward (refer to Figure 2 ).

[0099] (2) Next, determine the center position P1 (refer to Figure 5 ), which is the intersection of the line that bisects the absorbent core 11 in the longitudinal direction at its maximum length and the line that bisects the absorbent core 11 in the left-right direction at its maximum width. The region R1 of a circle with a diameter of 8 cm centered on this center position P1 is determined as the central portion R1 of the absorbent core 11 in the longitudinal direction and also in the left-right direction.

[0100] (3) Next, measure the overall thickness of the sanitary napkin 1 at five places within the central portion R1, and calculate the average value of the thicknesses at these five places. The average value is set as the thickness of the central portion R1 of the panty-type sanitary napkin 1 before the menstrual blood dripping test.

[0101] (4) Next, a cylindrical jig 40 (outer diameter 8 cm, inner diameter 7 cm, thickness (outer radius - inner radius) 0.5 cm, weight 200 g) is set in the central portion R1. 10 ml of artificial menstrual blood is dropped into the inside of the jig 40, and after the artificial menstrual blood penetrates into the absorbent main body, it is left for 1 hour in a state where the jig 40 is removed.

[0102] (5) After 1 hour from the start of dripping artificial menstrual blood, the overall thickness of the sanitary napkin 1 is measured at five locations within the region (hollow portion) inside the central portion R1 where the jig 40 was placed, and the average value of the thicknesses at these five locations is calculated. This average value is set as the thickness of the central portion R1 of the short-pant type sanitary napkin 1 after the menstrual blood dripping test. Then, it is compared with the thickness before the test.

[0103] In addition, the thickness of the sanitary napkin 1 is measured, for example, using a spring-type thickness gauge (Peacock J-B) manufactured by Ozaki Seisakusho Co., Ltd. or a thickness gauge equivalent thereto (the pressure during measurement is determined according to the jig of the above-mentioned gauge). When the sanitary napkin 1 has a compressed portion (embossing) locally compressed in the planar direction, the thickness of the non-compressed portion is measured.

[0104] The artificial menstrual blood uses a substance prepared by adding 80 g of glycerol, 8 g of sodium carboxymethylcellulose, 10 g of sodium chloride, 4 g of sodium bicarbonate, 8 g of Red No. 102, 2 g of Red No. 2, and 2 g of Yellow No. 5 to 1 L of ion-exchanged water and stirring well.

[0105] Table 1

[0106] <<Menstrual Blood Dripping Test>>

[0107]

[0108] Samples of short-pant type sanitary napkins (Examples A to D, Comparative Example A) are actually manufactured, and the menstrual blood dripping test is conducted. The results of the menstrual blood dripping test of the short-pant type sanitary napkin 1 (Examples A to D) of the present embodiment and Comparative Example A are shown in Table 1.

[0109] As shown in Table 1, the structures of the absorbent cores 11 of the respective samples are as follows. In Example A, the pulp fiber (basis weight 145 g / m 2 ) does not contain SAP (superabsorbent polymer), in Example B, the pulp fiber (basis weight 145 g / m 2 ) contains 1.3 g of SAP in total at a basis weight of 20.4 g / m 2 , in Example C, the pulp fiber (basis weight 145 g / m 2 ) contains 1.95 g of SAP in total at a basis weight of 30.6 g / m 2 , in Example D, the pulp fiber (basis weight 145 g / m 2 ) contains 2.6 g of SAP in total at a basis weight of 40.8 g / m 2 , and in Comparative Example A, the pulp fiber (basis weight 145 g / m 2 ) contains 133.4 g of SAP in total at a basis weight of 133.4 g / m2 Contains 8.5 g of SAP by total weight.

[0110] In addition, the top sheet 11 uses a hydrophilic hot air non-woven fabric (basis weight 25 g / m 2 ), the core wrap sheet 15 uses cotton paper (basis weight 15 g / m 2 ), the bottom sheet 13 uses a breathable resin film (basis weight 20 g / m 2 ), and the side sheets use a hydrophobic SMS non-woven fabric (basis weight 15 g / m 2 ).

[0111] According to the results in Table 1, in Examples A to D, the thickness after the menstrual blood drop test was less than the thickness before the test. In addition, it was found that there was the following tendency: as the basis weight per unit area of the SAP contained in the absorbent core 11 decreased, the ratio of the thickness reduction also increased (the value of (thickness after dropping) / (thickness before dropping) further decreased).

[0112] Table 2

[0113]

[0114] Table 2 shows the results of the reference tests for the menstrual blood drop test. As a reference test, a panty-type sanitary napkin having an absorbent core (pulp fiber, basis weight 145 g / m 2 ) that does not contain SAP was manufactured. The absorbent core of Reference Example A for the menstrual blood drop test was flat-pressed during manufacturing (a process of uniformly compressing the entire surface of the absorbent core). The absorbent core of Reference Example B was directly obtained by demolding the pulp fiber laminated on the mold and was not flat-pressed.

[0115] According to the results in Table 2, in Reference Example A where the absorbent core was flat-pressed, the thickness after the menstrual blood drop test was greater than the thickness before the test. On the other hand, in Reference Example B where the absorbent core was not flat-pressed, the thickness after the menstrual blood drop test was less than the thickness before the test. Therefore, it was found that the pressure applied in the thickness direction during the manufacture of the absorbent core also affects the thickness of the absorbent core (sanitary napkin 1) after absorbing menstrual blood.

[0116] Based on the above results, by adjusting the amount of SAP contained in the absorbent core 11 and the intensity of the pressure applied during the manufacture of the absorbent core 11, it is possible to manufacture the sanitary napkin 1 of the present embodiment that suppresses the swelling of the central portion R1 of the sanitary napkin 1 after absorbing menstrual blood.

[0117] Moreover, in the unfolded and stretched state of the sanitary napkin 1 ( Figure 5)Under the following conditions, in the case of conducting a saline drop test in which saline is dropped onto the dorsal central portion R2, which is the central portion in the longitudinal direction (the left - right direction) of the dorsal region 11C when the absorbent core 11 is trisected in the longitudinal direction, it is desirable that the thickness of the dorsal central portion R2 of the short - type sanitary napkin 1 after the saline drop test is less than the thickness of the dorsal central portion R2 of the short - type sanitary napkin 1 before the saline drop test.

[0118] In the saline drop test, envisioning a scenario where the wearer sweats on the dorsal part when sleeping (in a supine sleeping position), saline (artificial sweat) is dropped onto the dorsal central portion R2 of the absorbent core 11, which is the position that abuts against the wearer's dorsal part. According to the applicant's research results, the amount of saline dropped is also set to the average amount of sweat during sleep (8 hours), which is 30 ml.

[0119] In the sanitary napkin 1, different from a diaper that requires a space for storing feces in the buttocks, it is desirable that the sanitary napkin 1 enters the groove of the wearer's buttocks. Thus, it is possible to suppress the back - leakage of menstrual blood along the groove of the buttocks. Therefore, as in the sanitary napkin 1 of the present embodiment, by preventing the thickness of the dorsal central portion R2 of the sanitary napkin 1 from swelling after absorbing sweat (saline), it is easy to maintain the state where the sanitary napkin 1 adheres closely to the groove of the buttocks (the state of entering the groove of the buttocks). In addition, by thinning the thickness of the dorsal central portion R2 of the sanitary napkin 1, it is possible to avoid forming irregularities on the skin side of the sanitary napkin 1. Therefore, it can also be said that it is easy to maintain the state where the sanitary napkin 1 adheres closely to the wearer's dorsal part (buttocks). As a result, it is possible to suppress the back - leakage of menstrual blood along the groove of the buttocks. In particular, even when the buttocks are prone to sweating during sleep, back - leakage can be suppressed.

[0120] Here, the method of the "saline drop test" will be described. Mainly, the differences from the menstrual blood drop test will be described.

[0121] (1) First, set the short - type sanitary napkin 1 to be measured as an unfolded and elongated state and fix it with the skin side facing upward.

[0122] (2) Next, determine the dorsal region 11C in the region (11A - 11C) obtained by trisecting the absorbent core 11 in the longitudinal direction at its maximum length, and determine the dorsal center position P2, which is the intersection of the line that bisects the dorsal region 11C in the longitudinal direction at its maximum width and the line that bisects the dorsal region 11C in the left - right direction at its maximum width (refer to Figure 5 ). Determine the region R2 of a circle with a diameter of 8 cm centered on this dorsal center position P2 as the central portion in the longitudinal direction and the left - right direction of the dorsal region 11C, that is, the dorsal central portion R2.

[0123] (3) Next, measure the overall thickness of the sanitary napkin 1 at five locations within the dorsal central portion R2, and calculate the average value of the thicknesses at these five locations. Set this average value as the thickness of the dorsal central portion R2 of the short-pant type sanitary napkin 1 before the saline drop test.

[0124] (4) Next, set up a cylindrical jig 40 (the same as in the menstrual blood drop test) at the dorsal central portion R2. Drop 30 ml of physiological saline inside the jig 40. After the physiological saline penetrates into the absorbent body, leave it for 1 hour with the jig 40 removed. Use physiological saline with a concentration of 0.9%.

[0125] (5) After leaving it for 1 hour since the saline was dropped, measure the overall thickness of the sanitary napkin 1 at five locations within the area (hollow portion) on the inner side of the dorsal central portion R2 where the jig 40 was previously placed, and calculate the average value of the thicknesses at these five locations. Set this average value as the thickness of the dorsal central portion R2 of the short-pant type sanitary napkin 1 after the saline drop test. Then, compare it with the thickness before the test.

[0126] Table 3

[0127] <<Saline Drop Test>>

[0128]

[0129] Table 3 shows the results of the saline drop test for the short-pant type sanitary napkin 1 (Examples A to D) of the present embodiment and Comparative Example A. For samples (Examples A to D, Comparative Example A) having the same structure as the samples of the short-pant type sanitary napkin that underwent the above menstrual blood drop test, the saline drop test was conducted. According to the results in Table 3, in Examples A and B, the thickness after the saline drop test was less than the thickness before the test. On the other hand, for Examples C and D and Comparative Example A, where the unit area weight of the SAP was greater than that of the SAP in Examples A and B, the thickness after the saline drop test was greater than the thickness before the test. Similarly to the menstrual blood drop test, it was found that there was a tendency that as the unit area weight of the SAP contained in the absorbent core 11 decreased, the ratio of the thickness reduction also increased ((the thickness after dropping) / (the thickness before dropping) value further decreased).

[0130] Table 4

[0131]

[0132] Table 4 shows the results of the reference tests of the brine dripping test. The reference tests (tests of dripping brine onto panty liners with an absorbent core that does not contain SAP) were also carried out in the same manner. As a result, as shown in Table 4, in Reference Example A where the absorbent core was flat-pressed, the thickness after the brine dripping test was greater than the thickness before the test, and in Reference Example B where the absorbent core was not flat-pressed, the thickness after the brine dripping test was less than the thickness before the test. Therefore, it was found that the pressure applied in the thickness direction during the manufacture of the absorbent core also affects the thickness of the absorbent core (sanitary napkin 1) after absorbing brine.

[0133] Based on the above results, by adjusting the amount of SAP contained in the absorbent core 11 and the intensity of the pressure applied during the manufacture of the absorbent core 11, it is possible to obtain the sanitary napkin 1 (Example A, Example B) of the present embodiment that suppresses swelling after absorbing sweat generated in the dorsal part (buttocks).

[0134] In addition, the absorbent core 11 of the present embodiment contains water-retaining fibers, and the parts where the water-retaining fibers do not exist (for example, the parts where only SAP exists) are not included in the absorbent core 11. The water-retaining fibers are not particularly limited as long as they have the property of absorbing and retaining moisture, and for example, cellulose-based fibers (for example, non-wood-based fibers such as pulp fibers, cotton, and hemp, and regenerated fibers such as rayon) can be exemplified.

[0135] The absorbent core 11 may not have a superabsorbent polymer (SAP). The superabsorbent polymer swells when absorbing a liquid. Therefore, by making the absorbent core 11 not have a superabsorbent polymer, even after absorbing menstrual blood and sweat, it is not easy to form irregularities on the skin side of the absorbent core 11, and it is easy to maintain the state where the sanitary napkin 1 is close to the wearer, and leakage can be suppressed.

[0136] Not limited to the above, the absorbent core 11 may have a superabsorbent polymer. For example, a superabsorbent polymer may be mixed in the aggregate of water-retaining fibers. In this case, the water retention amount of the absorbent core 11 can be reliably ensured. In addition, since the superabsorbent polymer reliably retains the absorbed liquid, backwetting of the excreted liquid (returning to the topsheet 12) can be suppressed.

[0137] However, in the sanitary napkin 1, the water retention amount to the extent of a diaper is not required.

[0138] Therefore, the ratio (SAP / water-retaining fibers) of the total weight (g) of the superabsorbent polymer contained in the absorbent core 11 to the total weight (g) of the water-retaining fibers contained in the absorbent core 11 is preferably 1 / 5 or less.

[0139] Thus, compared with the case where the ratio is greater than 1 / 5, it is not easy to form unevenness on the skin side of the sanitary napkin 1 after absorbing the excreted fluid, and it is easy to maintain the state where the sanitary napkin 1 is close to the wearer.

[0140] In addition, preferably, the weight per unit area (g / m 2 ) and the thickness of the surface sheet 12 are greater than the weight per unit area (g / m 2 ) and the thickness of the skin side sheets 21 and 31, and the total weight (g) of the superabsorbent polymer contained in the absorbent core 11 is lighter than the total weight (g) of the surface sheet 12 of the sanitary napkin 1.

[0141] In this case, compared with the case where the weight per unit area (g / m 2 ) and the thickness of the surface sheet 12 are smaller than the weight per unit area (g / m 2 ) and the thickness of the skin side sheets 21 and 31, the skin feel and cushioning property of the surface sheet 12 are improved. Therefore, for a wearer who is overly sensitive around the vaginal orifice during menstruation, the wearing comfort of the surface sheet 12 is improved. On the other hand, by suppressing the total weight of the superabsorbent polymer, the water retention amount of the absorbent body 10 is not unnecessarily increased, and the total weight of the absorbent body 10 can be reduced. Thus, the sagging caused by the self-weight of the absorbent body 10 can be suppressed, and it is easy to maintain the state where the sanitary napkin 1 is close to the wearer.

[0142] In addition, regarding the comparison of the thicknesses of the skin side sheets 21 and 31 and the surface sheet 12, it can be carried out by a known method. For example, it can be measured by the same method as the method for measuring the thickness of the sanitary napkin 1 in the above menstrual blood dripping test. In addition, it is preferable to cut out a plurality of samples from the sheets (21, 31, 12) as objects separated from the sanitary napkin 1 and compare them using the average value of the weight per unit area and the average value of the thickness of the plurality of samples of each sheet.

[0143] In addition, when the absorbent core 11 contains a superabsorbent polymer, the total weight (g) of the core wrapping sheet 15 and the absorbent core 11 (that is, the water-retaining fibers and the superabsorbent polymer present in the core wrapping sheet 15) is preferably lighter than half of the weight of the entire panty-type sanitary napkin 1.

[0144] Thus, the weight of the components (the core wrapping sheet 15 and the absorbent core 11) that affect the water retention amount of the absorbent body 10 can be suppressed, the water retention amount of the absorbent body 10 is not unnecessarily increased, and the total weight of the absorbent body 10 can be reduced. Thus, the sagging caused by the self-weight of the absorbent body 10 can be suppressed. Thus, it is easy to maintain the state where the sanitary napkin 1 is close to the wearer.

[0145] When the absorbent core 11 has a super absorbent polymer (SAP), it is preferred that the water retention capacity of the absorbent body 10 be less than 150 g and the total weight of the absorbent core 11 (excluding the core wrap sheet 15) be 20 g or less.

[0146] Thus, the water retention capacity of the absorbent core 11 does not increase unnecessarily, and the total weight of the absorbent body 10 can be reduced. Moreover, compared with the case where the total weight of the absorbent core 11 is greater than 20 g, the sagging caused by the own weight of the absorbent body 10 can be suppressed, and the sanitary napkin 1 can be easily maintained in a state of being close to the wearer.

[0147] Figure 6 It is an explanatory diagram of the narrowed part 11D of the absorbent core 11.

[0148] Preferably, the absorbent core 11 has a narrowed portion 11D narrowed inwardly in the left-right direction in the crotch portion 1B (the portion from the lower end of the ventral waist portion 20 to the lower end of the dorsal waist portion 30) located at the crotch of the wearer when the shorts-type sanitary napkin 1 is worn.

[0149] Thus, when the wearer holds the narrowed portion 11D of the absorbent core 11 between the legs, it is less likely to feel hard (less foreign body sensation), and the wearing comfort is improved. In addition, the width of the absorbent core 11 is wider at the rear side of the narrowed portion 11D. Therefore, it can give a sense of security to the user who is worried about leakage at the back when sleeping.

[0150] Furthermore, it is preferred that the underpants-type sanitary napkin 1 be in the unfolded and stretched state (see Figure 6 ), when the absorbent core 11 is divided into three equal parts in the longitudinal direction, the total weight (g) of the water-retaining fibers is greater in the back region 11C than in the central region 11B.

[0151] Thus, menstrual blood tends to flow backwards during sleep, but the large amount of water-retaining fibers in the back region 11C can reliably absorb the menstrual blood and suppress back leakage. In addition, the large amount of water-retaining fibers in the back region 11C can reliably absorb sweat from the back region, which is more prone to sweating than the ventral region. Therefore, a decrease in wearing comfort and skin inflammation caused by sweat can be suppressed.

[0152] In addition, even if the weight per unit area of ​​the water-retaining fibers is constant in the central region 11B and the back region 11C of the absorbent core 11, the total weight of the water-retaining fibers can be increased because the plane area (width) of the absorbent core 11 in the back region 11C is larger. Furthermore, the weight per unit area of ​​the water-retaining fibers in the back region 11C may be larger than that in the central region 11B.

[0153] In addition, when the absorbent core 11 has a narrowed portion 11D, as shown in FIG.Figure 6 As shown, it is preferable that the narrowing portion 11D and the regions 11E adjacent to both outer sides of the narrowing portion 11D in the left-right direction have a superabsorbent polymer. Moreover, it is preferable that the total weight (g) of the superabsorbent polymer in the adjacent regions 11E is smaller than that in the narrowing portion 11D. In addition, the regions 11E adjacent to the narrowing portion 11D refer to the regions from the side ends of the absorbent core 11 in the left-right direction to the side ends of the absorbent body 10 that overlap with the narrowing portion 11D in the length direction.

[0154] In the narrowing portion 11D, which is the portion where the excretory orifice of the wearer abuts, the menstrual blood is reliably absorbed and retained by the presence of the superabsorbent polymer, and backwetting and leakage can be suppressed. In addition, since the regions 11E adjacent to the narrowing portion 11D are located at the leg circumference of the wearer, the presence of the superabsorbent polymer in these regions 11E can absorb the sweat at the leg circumference, improving the wearing comfort and suppressing skin inflammation. On the other hand, it is preferable that the total weight (g) of the superabsorbent polymer in the regions 11E adjacent to one side of the narrowing portion 11D in the left-right direction and the total weight (g) of the superabsorbent polymer in the regions 11E adjacent to the other side of the narrowing portion 11D in the left-right direction are smaller than the total weight (g) of the superabsorbent polymer present in the narrowing portion 11D. Thereby, the swelling caused by the absorption of sweat by the superabsorbent polymer in the adjacent regions 11E can be suppressed, and the discomfort (foreign body sensation) at the leg circumference can be alleviated.

[0155] In addition, when the absorbent core 11 has a superabsorbent polymer and has a narrowing portion 11D, the following is desirable. It is preferable that the narrowing portion 11D has the narrowest portion 11F with the shortest length in the left-right direction, and the portion 11G of the absorbent core 11 located outside the narrowest portion 11F in the left-right direction has a lower unit area weight (average unit area weight) of the superabsorbent polymer than the portion (the inner portion of 11G) of the absorbent core 11 that overlaps with the narrowest portion 11F in the left-right direction.

[0156] Thereby, in the portion that overlaps with the narrowest portion 11F in the left-right direction and is the portion where the excretory orifice of the wearer abuts, the unit area weight of the superabsorbent polymer is high, so the menstrual blood is reliably absorbed and retained, and backwetting and leakage can be suppressed. In addition, in the portions 11G outside the narrowest portion 11F (the four corners of the absorbent core 11), the formation of unevenness due to liquid absorption can be avoided, and the absorbent core 11 inside can be stably supported at the four corners (11G) of the absorbent core 11, and it is easy to maintain the state where the absorbent core 11 inside is close to the wearer.

[0157] In addition, the comparison of the weights and unit area weights of the above-described various materials (water-retaining fibers, superabsorbent polymers, etc.) can be carried out by using a known method.

[0158] Figure 7 This is a side view of the state in which the short-pant type sanitary napkin 1 is folded. Generally, the short-pant type sanitary napkin 1 is mostly stored in an independent package or a sealed package in a state where the waist portions (20, 30) that extend outward in the left and right directions from the absorbent main body 10 are folded. Therefore, as Figure 7 shown, preferably, in a state where the portions of the ventral waist portion 20 and the dorsal waist portion 30 that are located outside the absorbent main body 10 in the left and right directions are folded in the left and right directions with the ventral side being the inner side, the surface sheet 12 can be visually recognized from the leg opening LH. The surface sheet 12 refers to a sheet that is at least in the central portion of the absorbent main body 10 in the left and right directions and in the longitudinal direction and is located closest to the skin side.

[0159] That is, it is preferable that the leg opening LH is not covered by the dorsal waist portion 30 (especially the crotch side portion 30B that covers the buttocks) and the inside (surface sheet 12) of the sanitary napkin 1 can be visually recognized from the outside. Thus, the inside of the sanitary napkin 1 communicates with the outside through the leg opening LH, and moisture is not likely to accumulate inside the sanitary napkin 1 before use. In addition, it is easy to form a passage for air that connects the pair of leg openings LH in the left and right directions, and moisture is not likely to accumulate inside the sanitary napkin 1 before use. Therefore, the comfort of the wearer when wearing the sanitary napkin 1 is ensured.

[0160] <<Package 50 of the short-pant type sanitary napkin>>

[0161] Figure 8 This is a front view of the package 50 of the short-pant type sanitary napkin 1. Figure 9 A and Figure 9 B are front views of the packages 60 and 70 of the short-pant type sanitary napkin 1 in modified examples. Preferably, the short-pant type sanitary napkin 1 is packaged in the package 51 in units of one or more. Thus, it is easy for the user to carry the short-pant type sanitary napkin 1 when going out, and it can also be hygienically stored.

[0162] In the present embodiment, an example is shown in which the short-pant type sanitary napkin 1 is enclosed in a rectangular package 51 in an unfolded state and folded into three folds (folded twice) in the longitudinal direction to form a package 50. In addition, as Figure 7As shown, it is preferable that the short-pant type sanitary napkin 1 is enclosed in the packaging member 51 in a state where the waist portions (20, 30) that project the absorbent main body 10 outward in the left-right direction are folded inward in the left-right direction, or further in a state of being folded in half in the up-down direction. The package 50 has a longitudinal direction and a lateral direction that are orthogonal to each other. The length direction of the packaging member 51 (rectangular) corresponds to the longitudinal direction, and the width direction of the packaging member 51 (rectangular) corresponds to the lateral direction. Moreover, a plurality of joining portions 52 that join the opposing packaging members 51 intermittently are provided at a pair of side end portions in the lateral direction. As a joining method at the joining portion 52, welding and an adhesive joining method can be exemplified. In addition, it is not limited to providing intermittent joining portions 52 on both of the pair of side end portions in the lateral direction, and it is sufficient if at least one side is provided with intermittent joining portions 52.

[0163] In the above-described package 50, preferably, the left-right direction of the short-pant type sanitary napkin 1 enclosed in the packaging member 51 is along the lateral direction of the package 50. Thus, inside the package 50, a pair of leg opening portions LH on both sides in the left-right direction of the sanitary napkin 1 and the intermittent joining portions 52 of the package 50 are arranged in the lateral direction (left-right direction). Therefore, a passage for air that connects the outside and the inside of the package 50 and the inside of the sanitary napkin 1 is formed. Specifically, this passage is a passage for air that passes from the outside of the package 50 through between the intermittent joining portions 52 (non-joining portions), through the leg opening portions LH of the sanitary napkin 1, then through the inside of the sanitary napkin 1, and then through between the joining portions 52 on the opposite side and penetrates to the outside of the package 50. Therefore, moisture is not likely to accumulate inside the sanitary napkin 1 before use, and the comfort of the wearer when wearing the sanitary napkin 1 can be ensured.

[0164] However, the packaging method of the packaging member for the sanitary napkin 1 is not particularly limited. For example, as Figure 9 shown in A, a joining portion (welding portion) 63 that extends continuously in the longitudinal direction may be provided at a side end portion on one side in the lateral direction of the tubular packaging member 61 that extends in the lateral direction. Alternatively, the sanitary napkin 1 may be inserted into a bag-shaped packaging member 61 having a bottom (welding portion 63), and a plurality of joining portions 62 that join the opposing portions of the packaging member 61 intermittently may be provided at the side end portion on the opposite side in the lateral direction.

[0165] In addition, for example, as Figure 9 shown in B, intermittent joining portions 72 may be provided at a side end portion on one side in the lateral direction of the tubular bag member 71 whose back surface (not shown) is joined using a pillow-type packaging machine, and after inserting the sanitary napkin 1, intermittent joining portions 72 may also be provided at the side end portion on the opposite side in the lateral direction.

[0166] In addition, in Figure 9 A, Figure 9In the packages 60 and 70 shown in B, there is no opening end of the package 51 as in the case where the package 51 is folded into three folds as shown in Figure 8 Therefore, it is preferable to provide tear lines 64 and 73 in the packages 60 and 70, whereby the user can easily take out the sanitary napkin 1 from the packages 60 and 70. In addition, the positions of the tear lines 64 and 73 are not limited to the positions shown in the figure.

[0167] In addition, in Figure 8 In the package 50 having intermittent joints 52 provided at a pair of side ends in the lateral direction, the left - right direction of the sanitary napkin 1 is along the lateral direction of the package 50. However, conversely, as in Figure 9 A, Figure 9 B shown, in the packages 60 and 70 formed by intermittently joining the opposing packages 61 and 71 at at least one of the pair of side ends in the lateral direction, the left - right direction of the sanitary napkin 1 is along the longitudinal direction.

[0168] In this case, a pair of leg - opening portions LH on both sides in the left - right direction of the sanitary napkin 1 and the intermittent joints 62 and 72 of the packages 60 and 70 are not arranged in the same direction. Therefore, the outside air that enters the inside of the packages 60 and 70 through the intermittent joints 62 and 72 is not easily passed through the leg - opening portions LH of the sanitary napkin 1 and is not easily in contact with the inside (skin side) of the sanitary napkin 1. Thus, the sanitary napkin 1 can be hygienically stored until the packages 60 and 70 are opened.

[0169] ====Other Embodiments====

[0170] The embodiments of the present invention have been described above, but the above - described embodiments are for easy understanding of the present invention and are not used to limitatively interpret the present invention. In addition, the present invention can be changed and improved without departing from its gist, and the equivalents thereof are of course included in the present invention.

[0171] For example, the sanitary napkin 1 may be as follows: the thickness of the central portion R1 of the panty - type sanitary napkin 1 after the menstrual blood dripping test is less than the thickness of the central portion R1 of the panty - type sanitary napkin 1 before the menstrual blood dripping test, but the thickness of the dorsal central portion R2 of the panty - type sanitary napkin 1 after the saline dripping test is equal to or greater than the thickness of the dorsal central portion R2 of the panty - type sanitary napkin 1 before the saline dripping test (Examples C and D in Table 3).

[0172] Conversely, it may also be a sanitary napkin 1 as follows: the thickness of the central portion R1 of the panty-type sanitary napkin 1 after the menstrual blood dripping test is greater than or equal to the thickness of the central portion R1 of the panty-type sanitary napkin 1 before the menstrual blood dripping test, but the thickness of the dorsal central portion R2 of the panty-type sanitary napkin 1 after the saline dripping test is less than the thickness of the dorsal central portion R2 of the panty-type sanitary napkin 1 before the saline dripping test.

[0173] Explanation of reference numerals

[0174] 1. Panty-type sanitary napkin; 2. Lateral joining portion; 3. Leakage-preventing wall portion; 10. Absorbent main body; 11. Absorbent core; 12. Surface sheet; 13. Backsheet; 14. Side sheet; 15. Core wrapping sheet; 16. Leakage-preventing wall elastic member; 20. Ventral waist portion; 21. Skin side sheet; 22. Non-skin side sheet; 23. Waist elastic member; 24. Cover sheet; 30. Dorsal waist portion; 31. Skin side sheet; 32. Non-skin side sheet; 33. Waist elastic member; 34. Cover sheet; 35. Inclined elastic member; 40. Fixture; 50. Package of panty-type sanitary napkin; 60. Package of panty-type sanitary napkin; 70. Package of panty-type sanitary napkin.

Claims

1. A short-pant type sanitary napkin, comprising: An absorbent body having an absorbent core containing water-retaining fibers; A ventral waist portion; and A dorsal waist portion formed as a separate member relative to the ventral waist portion, characterized in that In the unfolded and extended state, The short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other, When a menstrual blood dropping test is performed by dropping artificial menstrual blood onto the central portion in the length direction and the left-right direction of the absorbent core, The thickness of the central portion of the short-pant type sanitary napkin after the menstrual blood dropping test is less than the thickness of the central portion of the short-pant type sanitary napkin before the menstrual blood dropping test.

2. A short-pant type sanitary napkin, comprising: An absorbent body having an absorbent core containing water-retaining fibers; A ventral waist portion; and A dorsal waist portion formed as a separate member relative to the ventral waist portion, characterized in that In the unfolded and extended state, The short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other, When a saline dropping test is performed by dropping physiological saline onto the dorsal central portion, which is the central portion in the length direction and the left-right direction, in the dorsal region when the absorbent core is trisected in the length direction, The thickness of the dorsal central portion of the short-pant type sanitary napkin after the saline dropping test is less than the thickness of the dorsal central portion of the short-pant type sanitary napkin before the saline dropping test.

3. A short-pant type sanitary napkin, comprising: An absorbent body having an absorbent core containing water-retaining fibers; A ventral waist portion; and A dorsal waist portion formed as a separate member relative to the ventral waist portion, characterized in that In the unfolded and extended state, The short-pant type sanitary napkin has a length direction, a left-right direction, and a thickness direction that are orthogonal to each other, When a menstrual blood dropping test is performed by dropping artificial menstrual blood onto the central portion in the length direction and the left-right direction of the absorbent core, The thickness of the central portion of the short-pant type sanitary napkin after the menstrual blood dropping test is less than the thickness of the central portion of the short-pant type sanitary napkin before the menstrual blood dropping test, When a saline dropping test is performed by dropping physiological saline onto the dorsal central portion, which is the central portion in the length direction and the left-right direction, in the dorsal region when the absorbent core is trisected in the length direction, The thickness of the dorsal central portion of the short-pant type sanitary napkin after the saline dropping test is less than the thickness of the dorsal central portion of the short-pant type sanitary napkin before the saline dropping test.

4. The short-pant type sanitary napkin according to any one of claims 1 to 3, characterized in that In the region between the ventral waist portion and the dorsal waist portion in the unfolded and extended state, there is no elastic member at a position outside the absorbent body in the left-right direction.

5. The short-pant type sanitary napkin according to any one of claims 1 to 3, characterized in that The absorbent core has a narrowed portion that narrows inward in the left-right direction in the crotch portion of the panty-type sanitary napkin that is located at the wearer's crotch when worn. In the unfolded and elongated state, the total weight of the water-retaining fibers is greater in the dorsal region than in the central region when the absorbent core is divided into three equal parts in the length direction.

6. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent core has a narrowed portion that narrows inward in the left-right direction in the crotch portion of the panty-type sanitary napkin that is located at the wearer's crotch when worn. The narrowed portion and the regions adjacent to both outer sides of the narrowed portion in the left-right direction have a superabsorbent polymer. The total weight of the superabsorbent polymer is smaller in the adjacent regions than in the narrowed portion.

7. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent core does not have a superabsorbent polymer.

8. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent body has a liquid-permeable surface sheet. In a state where the portions of the ventral waist portion and the dorsal waist portion that are located outside the absorbent body in the left-right direction are folded in the left-right direction with the ventral side being the inner side, the surface sheet can be visually recognized from the leg opening.

9. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent core has a superabsorbent polymer and has a narrowed portion that narrows inward in the left-right direction in the crotch portion of the panty-type sanitary napkin that is located at the wearer's crotch when worn. The narrowed portion has the narrowest portion with the shortest length in the left-right direction. The unit area weight of the superabsorbent polymer is lower in the portions of the absorbent core that are located outside the narrowest portion in the left-right direction than in the portions of the absorbent core that overlap the narrowest portion in the left-right direction.

10. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent body has a liquid-permeable surface sheet. The ventral waist portion and the dorsal waist portion each have a skin-side sheet, a non-skin-side sheet, and a waist elastic member that stretches in the left-right direction and is disposed between the skin-side sheet and the non-skin-side sheet. The absorbent core has a superabsorbent polymer. The unit area weight and thickness of the surface sheet are greater than those of the skin-side sheet, and the total weight of the superabsorbent polymer possessed by the absorbent core is lighter than the total weight of the surface sheet.

11. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The surface of the absorbent core is covered with a liquid-permeable core wrap sheet, and the absorbent core has a superabsorbent polymer. The combined weight of the core wrap sheet and the absorbent core is lighter than half the weight of the panty-type sanitary napkin.

12. A package of a panty-type sanitary napkin, which includes a package and the panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The package of the short-pant type sanitary napkin has a longitudinal direction and a lateral direction that are orthogonal to each other. The package is folded in a manner that encloses the short-pant type sanitary napkin. At least one of the pair of side ends of the opposing packages is discontinuously joined at a side end in the lateral direction. The left-right direction of the short-pant type sanitary napkin enclosed in the package is along the lateral direction.

13. A package of a short-pant type sanitary napkin, comprising a package and the short-pant type sanitary napkin according to any one of claims 1 to 3, characterized in that The package of the short-pant type sanitary napkin has a longitudinal direction and a lateral direction that are orthogonal to each other. The package is folded in a manner that encloses the short-pant type sanitary napkin. At least one of the pair of side ends of the opposing packages is discontinuously joined at a side end in the lateral direction. The left-right direction of the short-pant type sanitary napkin enclosed in the package is along the longitudinal direction.

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