Panty-type sanitary napkin and panty-type sanitary napkin set

Abstract

A panty-type sanitary napkin (1) having an absorbent main body (10) and a waistline portion (20) and having a first size, the waistline portion (20) having a plurality of heat-adhered portions (60) and being stretchable in the left-right direction, has, when viewed from above in a spread state, an overlapping region (R1) in which the absorbent main body (10) overlaps with the waistline portion (20) and a non-overlapping region (R2) in which they do not overlap, and the total area of the heat-adhered portions (60) provided per unit area in either of the overlapping region (R1) and the non-overlapping region (R2) is different from the area in another panty-type sanitary napkin (1) having the same brand name and sub-brand name as the panty-type sanitary napkin (1) and having a second size.

Description

Technical Field

[0001] This instruction manual relates to a panty-style sanitary napkin and a panty-style sanitary napkin set. Background Technology

[0002] In the past, when selling absorbent items such as shorts-style sanitary napkins, it was common to circulate product sets labeled with the same brand name or sub-brand name and available in multiple sizes such as M and L. Furthermore, in such absorbent items, methods are known to achieve good fit for each size by adjusting the strength of elasticity, etc. For example, Patent Document 1 discloses a method that, in absorbent items of different sizes, adjusts the elastic coefficient by changing the force properties of the elastic member (elastic twist) provided in the waistband (belt), thereby achieving suitable wearability.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-523634

[0006] The technical problem that the invention aims to solve

[0007] In the panty-style sanitary napkins of different sizes, as described in Patent Document 1, there is a problem that even if the elasticity of the waistband is changed, it is difficult to visually identify the differences in elasticity. That is, it is difficult for users to judge from appearance how the fit of the absorbent item differs due to size differences. Summary of the Invention

[0008] The present invention was made in view of the above-mentioned problems, and its object is to provide a panty-type sanitary napkin in which the different fits according to size differences can be easily understood by appearance.

[0009] Technical means for solving technical problems

[0010] The main invention for achieving the above objectives is a shorts-type sanitary napkin having intersecting vertical and horizontal directions, and having an absorbent body and a waistband. The waistband is formed by joining the abdominal side waistband and the back side waistband at their two ends in the horizontal direction through a pair of lateral joints. The shorts-type sanitary napkin has a first size, wherein the waistband has a skin-side sheet, a non-skin-side sheet, and a plurality of heat-adhesive portions joining the skin-side sheet and the non-skin-side sheet, and the waistband is elastic in the horizontal direction. When viewed from above in the unfolded state, at a position inside the horizontal direction than the pair of lateral joints, there is an overlapping area where the absorbent body and the waistband overlap and a non-overlapping area where the absorbent body and the waistband do not overlap. In either the overlapping area or the non-overlapping area, the total area of ​​the heat-adhesive portions per unit area is different from the area in other shorts-type sanitary napkins with the same brand name and sub-brand name as the shorts-type sanitary napkin and having a second size.

[0011] Other features of the invention will become more apparent from the description in this specification and the accompanying drawings.

[0012] The effects of the invention

[0013] According to the present invention, it is possible to provide a panty-shaped sanitary napkin whose fit varies depending on size and is easily understood by appearance. Attached Figure Description

[0014] Figure 1 This is a rough 3D diagram of sanitary napkin 1.

[0015] Figure 2 This is a top view of a sanitary napkin 1 in its unfolded and stretched state, viewed from the skin side in the thickness direction.

[0016] Figure 3 yes Figure 2 A schematic diagram of the AA section.

[0017] Figure 4 These are the top view and sectional view of the absorbent body 10.

[0018] Figure 5 This is an example of the packaging of a sanitary napkin 1 when it is circulating in the market.

[0019] Figure 6 This is a top view showing the configuration of the heat-bonded part 60.

[0020] Figure 7A and Figure 7B This diagram illustrates the three configuration styles of the thermally bonded part 60.

[0021] Figure 8A and Figure 8B This diagram illustrates the folds formed on the surface of the waist section 20 of the sanitary napkin 1.

[0022] Figure 9A and Figure 9B This figure illustrates the method of attaching the linear elastic member 26 to the waist section 20 using a heat-bonded part 60. Detailed Implementation

[0023] The following points are made clear from the description in this specification and the accompanying drawings.

[0024] A shorts-type sanitary napkin has intersecting vertical and horizontal directions, and includes an absorbent body and a waistband. The waistband is formed by joining an abdominal waistband and a back waistband at their respective ends in the horizontal direction via a pair of lateral joints. The shorts-type sanitary napkin has a first size. The waistband has a skin-side sheet, a non-skin-side sheet, and a plurality of heat-adhesive portions that join the skin-side sheet and the non-skin-side sheet. The waistband is elastic in the horizontal direction. When viewed from above in the unfolded state, at a position inside the horizontal direction from the pair of lateral joints, there is an overlapping area where the absorbent body and the waistband overlap, and a non-overlapping area where the absorbent body and the waistband do not overlap. In either the overlapping area or the non-overlapping area, the total area of ​​the heat-adhesive portions per unit area is different from the area in other shorts-type sanitary napkins with the same brand name and sub-brand name as the shorts-type sanitary napkin and having a second size.

[0025] Based on this type of shorts-shaped sanitary napkin, in larger sizes, by minimizing the area (area ratio) of the heat-bonded portion per unit area, the waistband can easily deform to conform to the wearer's body contours, resulting in a good fit. Conversely, in smaller sizes, the wearer's body contours are less pronounced; therefore, even with an increased area ratio of the heat-bonded portion, a good fit to the waistband is easily achieved. Furthermore, by increasing the area ratio of the heat-bonded portion, it is easier to maintain the deformed shape of the waistband when in contact with the body. Therefore, by varying the area ratio of the heat-bonded portion according to the size of the sanitary napkin, differences in fit can be easily observed visually.

[0026] In this shorts-type sanitary napkin, preferably, at least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet capable of stretching in the left-right direction, and the total area of ​​the heat-bonded portion provided per unit area in the end region of the overlapping area that overlaps with the two ends of the absorbent body in the left-right direction is different between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

[0027] Based on this type of panty-style sanitary napkin, if the area ratio of the heat-bonded portion in the end region is small, the elasticity of the waistband can easily act on the absorbent body, making it less likely for gaps to form between the absorbent body and the wearer's skin. Conversely, if the area ratio of the heat-bonded portion in the end region is large, excessive elasticity is less likely to act on the absorbent body, preventing the elastic components from leaving marks on the wearer's skin or creating an uncomfortable feeling. Therefore, by varying the area ratio of the heat-bonded portion in the end region according to the size of each sanitary napkin, differences in the fit of the absorbent body and the difficulty of side leakage can be easily understood visually.

[0028] In this shorts-type sanitary napkin, preferably, in the end region, the larger the size of the sanitary napkin, the smaller the total area of ​​the heat-bonded portion per unit area.

[0029] Based on this type of shorts-shaped sanitary napkin, by reducing the area ratio of the heat-bonded portion in the end region, the elasticity of the waistband can be easily applied to that end region. Therefore, even with a large size sanitary napkin, the two ends of the absorbent body can easily conform to a wide range of the wearer's buttocks, and the high fit is easily perceived from the appearance.

[0030] In this shorts-type sanitary napkin, preferably, the end region is located on the back side.

[0031] Based on this type of panty-shaped sanitary napkin, by providing end areas on the back side, when worn, it is difficult to create gaps between the two ends of the absorbent body and the wearer's skin over a wide area of ​​the buttocks, making it easy to understand its high fit through appearance.

[0032] In this shorts-type sanitary napkin, preferably, the total area of ​​the heat-adhesive portions provided per unit area in the end region is less than the total area of ​​the heat-adhesive portions provided per unit area in the region located at the same position as the end region in the vertical direction and located inside the end region in the horizontal direction.

[0033] In this type of panty-shaped sanitary napkin, the heat-bonded area on the inner side of the end region is large, and the waistband and absorbent body are difficult to shrink. Therefore, the absorbent body can easily conform to the wearer's body in a flat form. On the other hand, the heat-bonded area on the end region is small, and the waistband can easily stretch. Therefore, the two ends of the absorbent body are pressed against the wearer's body, which can easily suppress side leakage of excrement.

[0034] In this shorts-type sanitary napkin, preferably, the total area of ​​the heat-adhesive portions provided per unit area in the end region is greater than or equal to the total area of ​​the heat-adhesive portions provided per unit area in the region located at the same position as the end region in the vertical direction and located outside the end region in the horizontal direction.

[0035] In this type of shorts-shaped sanitary napkin, the outer sides of the end area are more resistant to excessive stretching around the waist compared to the end area itself. This prevents disruption of the uniformity in appearance between sanitary napkins of different sizes. Consequently, the sanitary napkin set appears neat and can improve its fit according to the wearer's body shape.

[0036] In this shorts-type sanitary napkin, preferably, a waist elastic member capable of stretching in the left-right direction is provided at the upper end of the waist portion, and the total area of ​​the heat-bonded portion provided per unit area in the non-overlapping area of ​​the region where the waist elastic member is provided is different between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

[0037] Based on this type of shorts-shaped sanitary napkin, the upper part of the abdominal side waist and the back side waist needs to reliably fit the wearer's waist when worn. The area ratio of the heat-bonded part varies depending on the size of each sanitary napkin. Thus, users can easily understand the difference in fit around the waist caused by the difference in the size of the sanitary napkin through appearance.

[0038] In this shorts-type sanitary napkin, preferably, in the back side waistband portion, in the area where the waistband elastic member is provided in the non-overlapping area, the total area of ​​the heat-bonded portion provided per unit area is different between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

[0039] According to this type of shorts-shaped sanitary napkin, the size of the bulge of the wearer's buttocks increases due to the difference in the size of the sanitary napkin. Therefore, in the area that overlaps with the elastic part of the waistband, the area ratio of the heat-bonded part varies according to the size of each sanitary napkin, so it is easy to judge by appearance that the fit to the bulge of the buttocks also varies according to the size of the sanitary napkin.

[0040] In this shorts-type sanitary napkin, preferably, the waistband has a non-skin side sheet made of non-woven fabric and a skin side sheet made of stretchable non-woven fabric layered on the skin side of the non-skin side sheet. When the waistband contracts in the left-right direction in its natural state, a non-skin side protrusion is formed where the non-skin side sheet protrudes to the non-skin side and a skin side protrusion is formed where the skin side of the skin side protrudes to the non-skin side. The shorts-type sanitary napkin has a portion where the skin side of the non-skin side protrusion contacts the non-skin side of the skin side protrusion.

[0041] In this type of shorts-shaped sanitary napkin, the inner side (skin side) of the folds formed by the non-skin side protrusions of the non-skin side sheet is filled by the skin side protrusions of the skin side sheet. As a result, the shape of the folds is stable and easily visually recognizable, allowing users to intuitively understand the differences in fit caused by variations in sanitary napkin size.

[0042] In this shorts-type sanitary napkin, preferably, the overlapping area has a high area ratio region where the total area of ​​the heat-bonded portion per unit area is higher than that of other areas, and the shorts-type sanitary napkin has a portion where the width in the left-right direction of the high area ratio region on the abdominal side is smaller than the width in the left-right direction of the high area ratio region on the back side.

[0043] In this type of shorts-shaped sanitary napkin, the area of ​​the heat-bonded section on the back side, which has a higher surface area ratio compared to the abdominal side, becomes narrower, thus allowing the waistband and absorbent core to deform easily. Therefore, even on the back side, which has a larger convexity and concavity compared to the abdominal side due to the bulge of the buttocks, the sanitary napkin can easily and reliably fit.

[0044] In this shorts-type sanitary napkin, it is preferable to have a portion where the width in the left-right direction of the high area ratio region is smaller than the width in the right-right direction of the high area ratio region at the lower end in the vertical direction.

[0045] Based on this type of panty-shaped sanitary napkin, the rigidity is increased at the lower part of the crotch area by maximizing the area ratio of the heat-bonded section. This maintains the rigidity of the absorbent core more effectively, preventing wrinkles even when the wearer's legs are clamped together during wear. On the other hand, compared to the crotch area, the back side has greater contours due to the bulge of the buttocks, allowing the waist area and absorbent core to deform easily, thus achieving a good fit.

[0046] In this shorts-type sanitary napkin, preferably, the waistband has a portion formed by a single sheet component in the thickness direction, and a plurality of the heat-bonded portions are also provided in this portion formed by the single sheet component.

[0047] According to this type of shorts-shaped sanitary napkin, by providing multiple heat-bonded sections in the waistband portion, which is composed of a single sheet material, the rigidity of the sheet material can be improved, making it easier to accurately cut the leg openings during the sanitary napkin manufacturing process. This results in a better appearance for the sanitary napkin (the shape of the leg openings).

[0048] In this shorts-type sanitary napkin, preferably, the absorbent body has an absorbent elastic member that stretches along the vertical direction, and the ratio of the length of the stretchable portion of the absorbent elastic member to the length from the top to the bottom of the shorts-type sanitary napkin in the vertical direction is different between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

[0049] Based on this type of shorts-shaped sanitary napkin, by adjusting the effective length of the absorbent elastic component, it is easy to integrate the size of the absorbent body for each sanitary napkin of different sizes. In addition, it is easy to suppress back leakage and other issues actually caused by the absorbent body.

[0050] Additionally, a set of shorts-type sanitary napkins is specified, comprising a first shorts-type sanitary napkin of a first size and a second shorts-type sanitary napkin of a second size. The first and second shorts-type sanitary napkins each have the same brand name and sub-brand name. The first and second shorts-type sanitary napkins each have intersecting vertical and horizontal directions. The first and second shorts-type sanitary napkins each have: an absorbent body; and a waistband, which is formed by joining the abdominal side waistband and the back side waistband at their respective ends in the horizontal direction through a pair of lateral joints. The waistband has a skin-side sheet, a non-skin-side sheet, and a plurality of heat-bonded portions that join the skin-side sheet and the non-skin-side sheet. The waistband is elastic in the left-right direction. When viewed from above in the unfolded state, there is an overlapping area where the absorbent body overlaps with the waistband and a non-overlapping area where the absorbent body does not overlap with the waistband, located on the inner side of the pair of side joints in the left-right direction. The total area of ​​the heat-bonded portions per unit area in either the overlapping area or the non-overlapping area is different between the first shorts-type sanitary napkin and the second shorts-type sanitary napkin.

[0051] Based on this type of shorts-shaped sanitary napkin, in larger-sized sanitary napkins, by minimizing the area (area ratio) of the heat-bonded portion per unit area, the waistband can easily deform to conform to the contours of the wearer's body, resulting in a good fit. Conversely, in smaller-sized sanitary napkins, the wearer's body has fewer contours; therefore, even with an increased area ratio of the heat-bonded portion, a good fit to the waistband is easily achieved. Furthermore, by increasing the area ratio of the heat-bonded portion, it is easier to maintain the deformed shape of the waistband when in contact with the body. Therefore, by varying the area ratio of the heat-bonded portion according to the size of the sanitary napkin, the difference in fit can be easily observed visually.

[0052] ===Implementation Methods===

[0053] As an example of a panty-type absorbent article according to an embodiment of the present invention, a panty-type sanitary napkin 1 (hereinafter simply referred to as "sanitary napkin 1") will be described.

[0054] <Basic Structure of Sanitary Napkins>

[0055] Figure 1 This is a schematic perspective view of the sanitary napkin 1 according to this embodiment. Figure 2 This is a top view of a sanitary napkin 1 in its unfolded and stretched state, viewed from the skin side in the thickness direction. Figure 3 yes Figure 2 A schematic diagram of the AA section.

[0056] Furthermore, the "stretched state" of the sanitary napkin 1 refers to the state in which the sanitary napkin 1 as a whole (the product as a whole) is stretched without wrinkles by stretching each elastic component of the sanitary napkin 1 (e.g., the absorbent elastic component 50, the skin-side sheets 22, 23, etc., described later). Specifically, it is the state in which the size of each component constituting the sanitary napkin 1 (e.g., the non-skin-side sheet 21 and the skin-side sheets 22, 23, etc., described later) is stretched to the same size as or close to the size of the individual component.

[0057] like Figure 1 As shown, the sanitary napkin 1 has mutually orthogonal "up-down direction", "left-right direction", and "front-back direction". Additionally, as... Figure 3As shown, the thickness direction is defined as the direction in which each component is stacked. In the up-down direction, the side that is to the wearer's torso when the sanitary napkin 1 is worn is designated as the "upper side," and the side that is to the wearer's groin area is designated as the "lower side." Similarly, in the front-back direction, the side that is to the wearer's abdomen when worn is designated as the "front side," and the side that is to the wearer's back is designated as the "back side." Furthermore, in the thickness direction, the side that is in contact with the wearer's skin when the sanitary napkin 1 is worn is designated as the "skin side," and the opposite side is designated as the "non-skin side."

[0058] In addition, sanitary napkin 1 Figure 2 The unfolded state shown has mutually orthogonal "vertical" and "horizontal" directions. "Vertical" is the direction along the vertical direction in the shorts shape, and "horizontal" is the direction along the left and right direction in the shorts shape.

[0059] The sanitary napkin 1 of this embodiment has an absorbent body 10 that absorbs liquids such as menstrual blood and a waist portion 20 disposed on the non-skin side of the absorbent body 10 and disposed around the wearer's waist when the sanitary napkin 1 is worn.

[0060] (Absorbent Subject 10)

[0061] Figure 4 These are the top view and sectional view of the absorbent body 10. For example... Figure 2 As shown, the absorbent body 10 of this embodiment is approximately rectangular in shape when viewed from above along the vertical direction of the sanitary napkin 1, in the longitudinal direction (i.e., the direction of the long side of the absorbent body 10). Furthermore, as... Figure 3 and Figure 4 As shown, the absorbent body 10 has: an absorbent core 11 along the longitudinal direction (up and down direction), a top sheet 12 disposed on the skin side compared to the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a back sheet 14 disposed on the non-skin side compared to the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the back sheet 14.

[0062] The absorbent core 11 is a component that absorbs and retains liquids such as menstrual blood, and is formed, for example, from liquid-absorbent fibers such as pulp fibers incorporating superabsorbent polymers (SAP). Alternatively, the absorbent core 11 can also be covered by a liquid-permeable sheet component (core-wrapped sheet) such as facial tissue or nonwoven fabric.

[0063] The top sheet 12 is a liquid-permeable sheet component that can come into contact with the wearer's skin when worn, and is formed, for example, from a hydrophilic hot-air nonwoven fabric, spunbond nonwoven fabric, etc. In this embodiment, such as... Figure 4As shown in the cross-sectional view, the two ends of the top sheet 12 in the left and right directions are folded back from the skin side to the non-skin side in the thickness direction on both outer sides of the absorbent core 11 in the left and right directions and sandwiched between the absorbent core 11 and the back sheet 14.

[0064] The second sheet 13 is a sheet component having substantially the same function and structure as the top sheet 12, and is laminated on the non-skin side surface of the top sheet 12. Furthermore, the second sheet 13 is not necessarily required in the absorbent body 10.

[0065] The back sheet 14 is a breathable and liquid-impermeable sheet component, for example, formed of a resin film, designed to prevent leakage of menstrual blood and other liquids absorbed by the absorbent core 11 to the outside.

[0066] The side sheet 15 is a sheet component laminated on the non-skin side of the back sheet 14, and is made of a hydrophobic nonwoven fabric such as SMS (spunbond-meltblown-spunbond) nonwoven fabric. In this embodiment, the side sheet 15 forms a pair of leak-proof wall portions 30, 30.

[0067] A pair of leak-proof wall portions 30 are provided on both sides of the absorbent body 10 in the left and right directions. These leak-proof wall portions 30 are equivalent to so-called three-dimensional pleats. When wearing the sanitary napkin 1, the leak-proof wall portions 30 stand up from both sides of the absorbent body 10 in the left and right directions toward the wearer's skin, thereby preventing menstrual blood and other excretory fluids from leaking out to the outside of the absorbent body 10.

[0068] In this embodiment, such as Figure 4 As shown in the cross-sectional view, the side sheet 15 extends outwards in the left-right direction (lateral direction) of the absorbent core 11 and bends towards the skin side in the thickness direction at both ends in the left-right direction of the absorbent body 10, with the ends 15t positioned on the skin side compared to the absorbent core 11. Additionally, as... Figure 4 Thus, at the end 15t, the side sheets 15 are folded back to form a stacked state in the thickness direction, and a leak-proof elastic member 31 is provided between the stacked side sheets 15, 15. When wearing the sanitary napkin 1, based on the elasticity of the leak-proof elastic member 31, the end 15t of the leak-proof part 30 contracts longitudinally (vertically), thereby causing the free end of the end 15t to stand upright towards the wearer's skin.

[0069] Furthermore, a high-density portion 40, where the absorbent core 11 has a higher density than the surrounding portion, is provided in the absorbent body 10. The high-density portion 40 is formed by extruding the components constituting the absorbent body 10 in the thickness direction. For example... Figure 4As shown, the high-density portion 40 of this embodiment has a first high-density portion 41, a second high-density portion 42, and a third high-density portion 43, which are respectively formed into a linear shape by arranging a plurality of dot-shaped extrusion portions. By providing such a high-density portion 40, the liquid absorbent fibers of the absorbent core 11 are prevented from spreading and collapsing. In addition, when wearing the sanitary napkin 1, by making this high-density portion 40 the starting point for bending, the absorbent core 11 can easily deform in three dimensions according to the wearer's body shape, and easily conform to the wearer's body.

[0070] Furthermore, the absorbent body 10 is provided with a plurality of absorbent elastic members 50 that stretch and contract along the longitudinal direction (vertical direction). The absorbent elastic members 50 are, for example, formed of rubber filaments and are positioned, elongated in the longitudinal direction, closer to the non-skin side (specifically, between the back sheet 14 and the side sheet 15) than the absorbent core 11. In the sanitary napkin 1 of this embodiment, as... Figure 4 As shown, five absorbent elastic members 50 are arranged at predetermined intervals in the left-right direction. The elongation ratio of the absorbent elastic members 50 is preferably about 2.7 to 3.2 times. Furthermore, the "elongation ratio" of an elastic member is the value obtained by dividing the length of the elastic member in its elongated state by the length of the elastic member in its natural state. By setting the elongation ratio of the absorbent elastic members 50 to be stronger than that of the leak-proof elastic members 31, the absorbent body 10 can easily contract from the non-skin side in the thickness direction, allowing the absorbent body 10 to easily conform to the wearer's body when wearing the sanitary napkin 1. That is, by utilizing the elasticity exhibited by the absorbent elastic members 50, the absorbent body 10 can easily fit snugly against the wearer's groin, making it difficult for menstrual blood and other excretory fluids to leak out.

[0071] (Waist area 20)

[0072] The waist section 20 is composed of one or more sheet components. In this embodiment, the waist section 21 includes a non-skin side sheet 21 and skin side sheets 22 and 23 (see reference). Figure 3 Additionally, in the following description, the portion of the waist circumference 20 that is forward (abdominal) from the center position CL in the longitudinal direction is referred to as the abdominal side waist circumference 20f, and the portion that is backward (back) from the center position CL is referred to as the back side waist circumference 20b.

[0073] The non-skin-side sheet 21 is a non-stretchable sheet component disposed on the non-skin-side of the sanitary napkin 1, and is formed, for example, of spunbond nonwoven fabric, SMS nonwoven fabric, etc. In this embodiment, as... Figure 2 As shown in the top view, the non-skin side sheet 21 has a shape with an inwardly tapered diameter in the longitudinal central portion (including the portion with the central position CL).

[0074] The skin-side sheet 22 is a stretchable sheet component (stretchable sheet) laminated longitudinally on the front side (abdominal side) and the skin side of the non-skin-side sheet 21. The skin-side sheet 22 (stretchable sheet) is formed, for example, from a stretchable nonwoven fabric. "Stretchable nonwoven fabric" refers to a nonwoven fabric that contains stretchable fibers with stretchability and elongation fibers with lower shrinkage than the stretchable fibers, and has undergone appropriate stretching treatments such as gear stretching. In the skin-side sheet 22 of this embodiment, as the stretchable fibers, fibers of polyurethane-based elastomers, which are a type of elastic thermoplastic elastomer, can be used, and as the elongation fibers, fibers of polypropylene (PP), a type of polyolefin resin, which is a type of non-elastic thermoplastic resin, can be used.

[0075] The skin-side sheet 22 is bonded by multiple thermally bonded portions 60 configured according to a prescribed pattern (see reference). Figure 7B The abdominal waistband 20f is bonded to the non-skin side sheet 21, thereby giving it elasticity at least in the left-right direction. In this embodiment, the heat-bonded portion 60 is formed using a known bonding method such as ultrasonic heat bonding. Details of the configuration of the heat-bonded portion 60 will be described next.

[0076] The skin-side sheet 23 is a stretchable sheet component laminated longitudinally on the rear (back) side of the non-skin-side sheet 21 on the skin side. The skin-side sheet 23 has the same structure as the skin-side sheet 22. That is, the skin-side sheet 23 is formed of a stretchable nonwoven fabric, with multiple distributed thermally bonded portions 60 (see reference 60). Figure 7B It is joined to the non-skin side sheet 21. Thus, the back side waist section 20b is given at least lateral elasticity.

[0077] In addition, elastic waistband components 25, such as rubber threads, are provided at the upper ends of the abdominal waistband 20f and the back waistband 20b, respectively, in a stretchable manner along the left and right direction. By providing such elastic waistband components 25, the fit at the waist opening 1a can be further improved, and misalignment of the waistband 20 can be suppressed when wearing the sanitary napkin 1. At least a portion of the elastic waistband component 25 is preferably configured to overlap with the skin-side sheets 22 and 23, respectively, when viewed from the thickness direction (see reference). Figure 2 and Figure 3 In this way, the lateral elasticity of the waistband elastic component 25 is linked with the lateral elasticity of the skin-side sheets 22 and 235, which can further improve the fit of the sanitary napkin 1 around the wearer's waist.

[0078] from Figure 2 From the unfolded state shown, at the central position CL in the longitudinal direction of the absorbent body 10 (in Figure 2(Using a dashed line as the folding position), the absorbent body 10 and waistband 20 of the sanitary napkin 1 are folded longitudinally (front-to-back direction). In this folded state, the two transverse (left-to-right direction) ends 20fe, 20fe of the abdominal side waistband 20f, which overlaps in the front-to-back direction, are joined with the two transverse (left-to-right direction) ends 20be, 20be of the back side waistband 20b using a known joining method such as sealing weld, forming a lateral joining portion 20we. Thus, the folded waistbands 20 (20f and 20b) are connected in a loop on the front (abdominal side) and back (back side), forming a loop. Figure 1 The waist opening 1a and a pair of leg openings 1b shown form a shorts-shaped sanitary napkin 1.

[0079] Furthermore, the shorts-type sanitary napkin 1 of this embodiment is marketed as a set of sanitary napkins available in various sizes. For example, in Figure 2 The sanitary napkin 1 shown in its extended and unfolded state is configured in multiple sizes, such as S, M, L, and XL, by appropriately varying the longitudinal length L1 and the transverse length W1 to suit the wearer's body size. Furthermore, these sets of sanitary napkins in various sizes are marketed under the same brand name and sub-brand name.

[0080] Figure 5 This is an example of the packaging of a sanitary napkin 1 when it is circulating in the market.

[0081] Sanitary napkins 1 are marketed as packaging bodies 100 (packages) that individually package multiple sanitary napkins 1 of the same size. The packaging body 100 is formed from packaging materials such as SMS non-woven fabric and resin film. Figure 5 The package 100 is a pouch-like structure that contains one or more folded, shorts-type sanitary napkins 1. At least the brand name 110, sub-brand name 120, and size marking 130 are displayed on the surface of the package. Brand name 110 indicates the brand of the sanitary napkin set containing the sanitary napkins 1, such as "Sofy (registered trademark)". Sub-brand name 120 indicates the name of a different product within the same brand, such as "Super Sleep". Size marking 130 indicates the size of the shorts-type sanitary napkins 1, such as S, M, L, XL, etc.

[0082] In the packaging 100 of the shorts-type sanitary napkin 1, the brand name 110 and sub-brand name 120 are universal for all sizes of shorts-type sanitary napkins 1. On the other hand, the size marking 130 varies depending on the size of the sanitary napkin 1. For example, in the packaging 100 of size L shorts-type sanitary napkin 1 and the packaging 100 of size XL shorts-type sanitary napkin 1, although the size marking 130 is different, the brand name 110 and sub-brand name 120 are the same. By visually recognizing such packaging 100 in retail stores, users can choose the desired brand of shorts-type sanitary napkin 1 (e.g., "Sofy", "Super Sleep", etc.) without making a mistake in selecting the required size. In addition, sanitary napkins are used on underwear according to the amount of menstrual flow, and different lengths such as daytime and nighttime use are used from the same brand, but in this embodiment, the shorts-type sanitary napkin is used to fit the waist. Therefore, it is important to be able to purchase the right size of shorts-type sanitary napkin 1 without making a mistake.

[0083] Previously, in sanitary napkin sets available in various sizes, the basic structure and appearance were universal. This led to a situation where users initially found it difficult to understand how the fit varied depending on the size of the sanitary napkin. For example, in absorbent items such as panty-style sanitary napkins in different sizes or standard underwear-style diapers, even if the elongation ratio of elastic components (such as stretch sheets) changed, they appeared to be the same absorbent items. Therefore, it was difficult for users to immediately grasp the difference in fit based on size.

[0084] Therefore, in the sanitary napkin 1 of this embodiment, by changing the configuration of the heat-bonding portion 60 for each size, the difference in fit caused by the size difference can be easily understood by appearance. The relationship between the heat-bonding portion 60 and fit will be explained below.

[0085] <Relationship between the size of sanitary napkin 1 and the configuration of the heat-bonded part 60>

[0086] Figure 6 This is a top view showing the configuration of the heat-bonded portion 60. Additionally, the same... Figure 6 This indicates that during the manufacturing process of sanitary napkin 1, the base material sheets (non-skin side sheet 21 and skin side sheets 22, 23) constituting the waistband 20 are bonded together in the thickness direction by the heat-bonding portion 60. That is, Figure 6 This indicates the waist section 20 before the cutting is performed to form the leg opening 1b.

[0087] Viewed along the thickness direction (top view). Figure 6 When the waist section 20 (sanitary napkin 1) is in its unfolded and elongated state as shown, the area where the absorbent body 10 overlaps with the waist section 20 is defined as the overlapping area R1. Figure 6The area inside the thicker line), the area where the absorbent main body 10 and the waist circumference 20 do not overlap is defined as the non-overlapping area R2. Figure 6 (The area outside the thicker line). Furthermore, sanitary napkin 1 is divided into three areas: A, B, and C. Figure 6 In this context, the shaded portion of the non-overlapping region R2 is designated as region A. Furthermore, the shaded portion of the overlapping region R1, where the two ends of the absorbent body 10 overlap in the left and right directions, is designated as region C (hereinafter, region C will also be referred to as the "end region"). Additionally, the portion of the sanitary napkin 1 other than region A and region C (end region) is designated as region B.

[0088] Figure 7A and Figure 7B This diagram illustrates the three configuration styles of the thermally bonded part 60.

[0089] Figure 7A This indicates the size and setting of sanitary napkin 1. Figure 6 A table showing the relationship between the arrangement patterns of the heat-bonded portions 60 in regions A to C. Additionally, in Figure 7A The example shows three sizes: M, L, and XL, but other sizes (such as S) are also possible. Figure 7B This indicates three configuration styles formed on the heat-bonded portion 60 of the sanitary napkin 1. Figure 7B Patterns 1 through 3 are all formed by arranging multiple thermally bonded portions 60 intermittently. Furthermore, the size and shape of each thermally bonded portion 60 differ in each pattern. Therefore, the total area (hereinafter referred to as "area ratio") of the thermally bonded portions 60 per unit area differs in these three patterns. Specifically, Pattern 1 has the largest area ratio, Pattern 2 has a smaller area ratio than Pattern 1, and Pattern 3 has a smaller area ratio than Pattern 2.

[0090] In sanitary napkin 1, Figure 6 In at least one of region C (overlapping region R1) and region A (non-overlapping region R2), the configuration of the heat-adhesive portion 60 is changed according to each size from M to LX. In other words, the total area (area ratio) of the heat-adhesive portions 60 provided per unit area in region C or region A of a certain size of sanitary napkin 1 is different from the total area (area ratio) of the heat-adhesive portions 60 provided per unit area in region C or region A of other sizes of sanitary napkin 1.

[0091] For example, a heat-bonding section 60 of style 2 is provided in area A of a size L sanitary napkin 1, while a heat-bonding section 60 of style 3 is provided in area A of a size XL sanitary napkin 1 (see reference). Figure 7AThat is, compared to the area ratio of the heat-bonded portion 60 in area A of size L sanitary napkin 1, the area ratio of the heat-bonded portion 60 in area A of size XL sanitary napkin 1 is smaller. Area A in waistband 20 is the part that does not overlap with the absorbent body 10 and is easily in direct contact with the wearer's skin during wear. Moreover, the smaller the area ratio of the heat-bonded portion 60 provided in waistband 20, the smaller the ratio of the non-skin side sheet 21 to the skin side sheets 22, 23, so the waistband 20 has lower rigidity and is more prone to deformation, making it easier to conform to the wearer's body.

[0092] Therefore, in the XL size sanitary napkin 1, by setting the area ratio of the heat-bonded portion 60 in region A to be as small as possible (Example 3), the waistband 20 can easily deform according to the larger contours of the wearer's body. Thus, even with the XL size sanitary napkin 1, which covers a larger area of ​​the wearer's skin, good fit can be achieved. On the other hand, in the L size (M size) sanitary napkin 1, the coverage area is smaller compared to the XL size, and the contours of the wearer's body are also smaller. Therefore, even if the area ratio of the heat-bonded portion 60 is increased (Example 2), good fit of the waistband 20 can be easily maintained. Furthermore, by increasing the area ratio of the heat-bonded portion 60, the deformed shape of the waistband 20 when in contact with the body can be easily maintained.

[0093] Therefore, good fit can be achieved for each sanitary napkin 1 of different sizes. Moreover, by making the pattern of the heat-bonded part 60 different for each different size, the user can visually perceive the difference in fit of the sanitary napkin 1. That is, the difference in fit caused by the difference in the size of the sanitary napkin 1 can be easily understood by appearance.

[0094] Furthermore, the waistband 20 of the sanitary napkin 1 is elastic in the lateral direction, so when it contracts naturally in the lateral direction, multiple folds are formed on the surface. Moreover, the softer and more easily deformable the waistband 20 is, the easier it is to form such folds. Therefore, by varying the area ratio of the heat-bonded portion 60 according to the size of the sanitary napkin 1, the shape and size of the folds formed in the waistband 20 can be made different. Furthermore, users can visually recognize these folds and intuitively understand the differences in fit caused by the differences in the size of the sanitary napkin 1.

[0095] Here, "natural state" refers to the state in which the sanitary napkin 1 has been placed for a specified time. For example, after removing the sanitary napkin 1 from its packaging, the abdominal waistband 20f and the back waistband 20b are stretched outwards to the left and right, making the waistband 20 "stretched state," and this stretched state is maintained for 15 seconds. Then, the stretching of the sanitary napkin 1 is released, and it is placed on a flat surface such as a table. This state after 5 minutes of flat placement is then considered the natural state.

[0096] Furthermore, in region C (end region) of the sanitary napkin 1 (waistband 20), the total area (area ratio) of the heat-bonded portions 60 provided per unit area varies depending on the size of the sanitary napkin. This region C (end region) is the portion of the overlapping region R1 located on both sides of the absorbent body 10 in the left-right direction on the back side (see reference). Figure 6 The absorbent body 10 is positioned along the wearer's buttocks when wearing the sanitary napkin 1. Therefore, if a gap is created between the absorbent body 10 and the wearer's skin in area C, side leakage of excrement and deterioration of fit are likely to occur.

[0097] In particular, in larger sanitary napkins such as XL size, the gap between the absorbent body 10 and the wearer's skin tends to be larger compared to smaller sanitary napkins.

[0098] Therefore, in this embodiment, the area ratio of the heat-bonded portion 60 in region C (end region) varies depending on the size of the sanitary napkin. For example, if the area ratio of the heat-bonded portion 60 is small, the waist portion 20 is prone to deformation in region C, and the elasticity generated by the skin-side sheet 23 (stretch sheet) easily acts on the absorbent body 10. As a result, the absorbent body 10 easily presses against the wearer's skin, making it difficult for gaps to form between the absorbent body 10 and the skin. Conversely, if the area ratio of the heat-bonded portion 60 is large, excessive elasticity is less likely to occur in region C, suppressing the elastic component from leaving marks on the wearer's skin and preventing discomfort on the wearer's skin. In this way, the difference in fit and the difficulty of side leakage at both sides of the absorbent body 10 can be easily understood by appearance depending on the size of the area ratio of the heat-bonded portion 60.

[0099] like Figure 7A and Figure 7B As shown, in the sanitary napkin 1 of this embodiment, the larger the size of the sanitary napkin, the smaller the area ratio of the heat-bonded portion 60 in region C (end region). Therefore, the larger the sanitary napkin, the easier it is for the elasticity generated by the skin-side sheet 23 (stretch sheet) to function in region C, and the less likely a gap will form between the absorbent body 10 and the wearer's skin. Thus, both sides of the absorbent body 10 can easily conform to a wide area of ​​the wearer's buttocks, suppressing side leakage of excrement such as feces, and easily demonstrating a high degree of fit. On the other hand, in smaller sanitary napkins, the gap between the absorbent body 10 and the wearer's skin is already smaller. Therefore, compared to larger sanitary napkins, even if the area ratio of the heat-bonded portion 60 in region C is increased, good fit can be easily achieved, and excessive elasticity is difficult to function in a narrow area.

[0100] Furthermore, in the sanitary napkin 1, a region C (end region) is provided on the back side along the longitudinal (vertical) direction of the absorbent body. As described above, this region C (end region) is located on the buttocks area, which has a large surface area and is prone to gaps between the sanitary napkin 10 and the absorbent body 10, when the sanitary napkin 1 is worn. Therefore, by providing region C on the back side, it is difficult for gaps to form between the sides of the absorbent body 10 and the wearer's skin over a wide area of ​​the buttocks, resulting in a high degree of fit that is easily understood from the appearance.

[0101] Furthermore, the area ratio of the heat-adhesive portion 60 in region C (end region) of the overlapping area R1 of the sanitary napkin 1 is less than the area ratio of the heat-adhesive portion 60 located at the same position as region C (end region) in the vertical direction and located inside region C (end region) in the horizontal direction. That is, in the sanitary napkin 1, the elasticity of the waist portion 20 in region C, which overlaps with both sides of the absorbent body 10, is greater than the elasticity of the waist portion 20 in region B, which is sandwiched by region C. Therefore, on the back side of the sanitary napkin 1, in the central part in the horizontal direction of the overlapping area R1, the waist portion 20 is difficult to stretch, and the absorbent body 10 is difficult to shrink, so the absorbent body 10 can easily conform to the wearer's body in a flat form. On the other hand, in the two sides in the horizontal direction of the overlapping area R1, the waist portion 20 can easily stretch, and the absorbent body 10 is pressed against the wearer's body, so side leakage of excrement can be easily suppressed.

[0102] Furthermore, the area ratio of the heat-bonded portion 60 provided in region C (end region) is greater than the area ratio of the portion of heat-bonded portion 60 located at the same position as region C (end region) in the vertical direction (longitudinal direction) and located on the outer side of region C (end region) in the horizontal direction (lateral direction) (a part of region A). That is, in the sanitary napkin 1, the elasticity of the waist portion 20 in region C, which overlaps with both sides of the absorbent body 10, is less than the elasticity of the waist portion 20 in region A, which is adjacent to the two outer sides of region C. Therefore, it is easy to suppress excessive stretching of the waist portion 20 on the two outer sides of region C. In particular, in larger sizes such as XL and L, since the elasticity in region A and region C is the same (the pattern of the heat-bonded portion 60 is the same), the waist portion 20 is less likely to stretch excessively, thus preventing the disruption of the uniformity of the appearance shape between sanitary napkins of different sizes. As a result, it is possible to form a sanitary napkin set with a neat appearance and improved fit according to the wearer's body shape.

[0103] Furthermore, preferably, in the overlapping region R1, the width in the left-right direction of the portion of the heat-bonded portion 60 with a high area ratio is smaller on the back side than on the abdomen side. In the sanitary napkin 1 of this embodiment, in region B of the overlapping region R1, the area ratio of the heat-bonded portion 60 is higher than that of other regions (Example 1). Figure 6 As shown, when the area B with a high area ratio is considered a high area ratio area, there is a portion where the width WR1f in the left-right direction of the high area ratio area B on the abdominal side is smaller than the width WR1b in the left-right direction of the high area ratio area B on the back side (WR1f > WR1b). In this portion, the area ratio of the heat-adhesive portion 60 is narrower on the back side compared to the abdominal side, therefore, the waist portion 20 and the absorbent body 10 are easily deformable. Therefore, even on the back side, which has a larger unevenness compared to the abdominal side due to the bulge of the buttocks, the sanitary napkin 1 can be easily and reliably fitted.

[0104] Furthermore, preferably, in the overlapping region R1, the width in the lateral direction of the portion of the thermally bonded portion 60 on the back side with a higher area ratio is smaller than that of the crotch portion (the lower end in the vertical direction). In the sanitary napkin 1 of this embodiment, as... Figure 6 As shown, the width WR1c of the high area ratio region (region B) at the longitudinal central position CL (lower end position in the vertical direction) is smaller in the horizontal direction than the width WR1b of the high area ratio region (region B) on the back side (WR1c > WR1b). The lower part of the crotch area in the vertical direction is the part that is prone to wrinkling in the horizontal direction when the sanitary napkin 1 is worn because the absorbent body 10 is compressed in the horizontal direction due to the legs of the wearer being clamped together. Therefore, it is preferable to maximize the area ratio of the heat-bonded portion 60 in the crotch area to make it easier to maintain rigidity. On the other hand, compared with the crotch area, the back side has greater unevenness due to the bulge of the buttocks, etc., as described above. Therefore, it is preferable to reduce the area ratio of the heat-bonded portion 60 to make the waist area 20 and the absorbent body 10 easier to deform. In this way, good fit to the body's unevenness can be achieved, and wrinkling of the absorbent body 10 is suppressed in the crotch area.

[0105] Furthermore, the heat-bonded portion 60 is basically formed to join the non-skin-side sheet 21 and the skin-side sheets 22, 23 that are stacked in the thickness direction. However, the heat-bonded portion 60 can also be formed on the portion of the sheet components that are not stacked in the thickness direction. In the sanitary napkin 1, in Figure 6In the non-overlapping region R2, region B, which is the region where only one non-skin-side sheet 21 is provided in the thickness direction, is also provided with a heat-bonding portion 60. The portion of the waistband 20 composed of only one sheet component (non-skin-side sheet 21) has low rigidity and is easily deformed. Therefore, in the manufacturing process of the sanitary napkin 1, it is sometimes difficult to cut the sheet component accurately in order to form the leg opening 1b. In this regard, by forming a pattern composed of multiple heat-bonding portions 60 in a portion of the sheet component, the rigidity of the sheet component is increased, and the leg opening 1b can be cut easily and accurately. As a result, the appearance of the sanitary napkin 1 (the shape of the leg opening 1b) can be improved. In addition, since the appearance when the absorbent body shrinks longitudinally due to the absorbent elastic member 50 can be improved, and the size of the leg opening 1b varies depending on the size, even if the shape of the folds formed by the shrinkage of the sheet portion (non-skin-side sheet 21) at the leg opening 1b due to the longitudinal shrinkage of the absorbent elastic member 50 varies depending on the size, the size difference can be identified.

[0106] Furthermore, in the sanitary napkin 1 of this embodiment, the length (hereinafter also referred to as "effective length") of the stretchable portion of the absorbent elastic member 50 provided on the absorbent body 10 varies depending on the size of each sanitary napkin 1. Specifically, the effective length (so-called crotch dimension) of the absorbent elastic member 50 in the vertical direction relative to the sanitary napkin 1 varies depending on each size. For example, in Figure 2 In this embodiment, the effective length L50 of the absorbent elastic member 50 is appropriately adjusted according to the crotch size (L1×1 / 2) of the sanitary napkin 1. Assuming the effective length of the absorbent elastic member 50 is the same for all sizes of sanitary napkins 1, there is a concern that the proportion of the absorbent body 10 relative to the crotch portion of the sanitary napkin 1 varies with each size, leading to poor aesthetic balance or deterioration of the absorbency of the absorbent body 10, resulting in leakage of excrement. Therefore, in this embodiment, by adjusting the effective length of the absorbent elastic member 50, the proportion of the absorbent body 10 relative to each sanitary napkin 1 of different sizes can be easily integrated, and leakage of excrement that actually occurs in the absorbent body 10 can be suppressed.

[0107] In addition, in the sanitary napkin 1, by making the shape of the pleats formed on the surface of the waistband 20 difficult to deform, the user can easily identify the different pleats formed according to each size. Figure 8A and Figure 8B This diagram illustrates the folds formed on the surface of the waist section 20 of the sanitary napkin 1. Figure 8A A cross-sectional view of the waist section 20 in its elongated state. Figure 8B A cross-sectional schematic diagram of the waist section 20, showing the state of wrinkles formed by contraction.

[0108] The waist section 20 has a double-layer structure in which skin-side sheets 22 and 23, made of stretchable nonwoven fabric (stretch sheet), are layered on the skin side of the non-skin-side sheet 21, made of nonwoven fabric. When the waist section 20 is in an extended state... Figure 8A All the stacked sheet components are planar. When the waist section 20 shrinks in the left-right direction from this state based on the shrinkage force of the stretch sheets (skin-side sheets 22, 23), a portion of the non-skin-side sheet 21 forms a non-skin-side protrusion 21c that bulges outward in the thickness direction. This non-skin-side protrusion 21c becomes a fold in the waist section 20. In addition, the skin-side sheet 22 (23) (stretchable nonwoven fabric) contains elongated fibers with low shrinkage, but these elongated fibers are difficult to shrink in the left-right direction. Therefore, a portion of the skin-side sheet 22 (23) bulges outward in the thickness direction like the non-skin-side sheet 21 to form a skin-side protrusion 22c (23c).

[0109] And, as Figure 8B In this way, the non-skin side surface of the skin-side protrusion 22c (23c) of the skin-side sheet 22 (23) overlaps with the skin-side surface of the non-skin side protrusion 21c of the non-skin side sheet 21. That is, the inner side (skin side) of the non-skin side protrusion 21c of the non-skin side sheet 21 is filled by the skin side protrusion 22c (23c) of the skin-side sheet 22 (23). As a result, the shape of the folds can be easily stabilized, and the user can easily visually identify the folds, thus making it easy to intuitively understand the difference in fit caused by the size difference of the sanitary napkin 1.

[0110] In addition, Figure 6 In this design, the sanitary napkin 1 is divided into three regions, A to C. The arrangement of the heat-adhesive portions 60 in each region varies depending on the size of the sanitary napkin 1. However, the arrangement of the heat-adhesive portions 60 can also be varied in regions other than A to C. For example, in the region overlapping with the waist elastic member 25 located at the upper ends of the abdominal waist portion 20f and the back waist portion 20b, the arrangement of the heat-adhesive portions 60 can vary depending on the size of each sanitary napkin 1. In other words, in the non-overlapping region R2 of the waist portion 20, the area ratio of the heat-adhesive portions 60 per unit area overlapping with the waist elastic member 25 can vary depending on the size of each sanitary napkin 1. The upper ends of the abdominal waist portion 20f and the back waist portion 20b are the parts that need to reliably fit the wearer's waist when wearing the sanitary napkin 1. Therefore, in this part, by making the area ratio of the heat-bonded part 60 different according to the size of each sanitary napkin 1, the user can easily understand by appearance the difference in fit around the waist caused by the difference in the size of the sanitary napkin 1.

[0111] In particular, in the back-side waistband 20b, due to the size difference of the sanitary napkins 1, the bulge of the wearer's buttocks becomes larger. Therefore, it is necessary for the back-side waistband 20b to reliably conform to this bulge. For this purpose, it is more preferable that the area ratio of the heat-bonded portion 60 varies depending on the size of each sanitary napkin 1 in the area overlapping with the waistband elastic member 25 provided at the upper end of the back-side waistband 20b. As a result, it is easy to visually determine that the fit relative to the bulge of the buttocks varies depending on the size of the sanitary napkin 1.

[0112] In addition, the division of the waist circumference area 20 can also be compared with... Figure 6 The divisions shown are different. For example, it could also be further divided. Figure 6 Region A is divided into two areas: the central part in the left-right direction is designated as region A1, and the two ends are designated as regions A2. The arrangement of the heat-bonding portions 60 in regions A1 and A2 varies depending on the size of each sanitary napkin 1. In this way, the area ratio of the heat-bonding portions 60 located in the overlapping region R1 and the non-overlapping region R2 of the sanitary napkin 1 can be set more precisely.

[0113] In addition, in the sanitary napkin 1 of this embodiment, Figure 2 The length of the absorbent body 10 in the longitudinal (vertical) direction is preferably longer on the back side (rear side) than on the abdominal side (front side). That is, preferably, in the longitudinal direction, the length of the absorbent body 10 further back than the central position CL is longer than the length of the absorbent body 10 further forward than the central position CL. When wearing the sanitary napkin 1, the wearer is in a sitting or supine position for a long time, and menstrual blood tends to flow towards the back side (rear side). Therefore, by configuring the absorbent body 10 to be offset from the longitudinal central position CL towards the back side (rear side), the area of ​​the absorbent body 10 on the back side is increased, which can easily suppress back leakage of menstrual blood.

[0114] Similarly, the preferred option is, Figure 2The effective length of the stretchable portion of the absorbent elastic member 50 in the longitudinal (vertical direction) is longer on the back side (rear side) than on the abdominal side (front side). That is, preferably, in the longitudinal direction, the effective length of the absorbent elastic member 50 further back than the central position CL is longer than the effective length of the absorbent elastic member 50 further forward than the central position CL. In the back side region, the groove of the wearer's buttocks extends longitudinally, therefore, to suppress rear leakage of excrement, it is necessary to improve the fit of the absorbent body 10 on the buttock side. Therefore, by extending the effective length of the absorbent elastic member 50 on the rear side, the range of the stretching force acting on the absorbent body 10 is expanded, thereby making it easier for the absorbent body 10 to fit tightly against the wearer's skin (buttocks). On the other hand, in the abdominal side region, compared to the back side, the wearer's body shape is flatter, therefore, even if the effective length of the absorbent elastic member 50 is shortened to narrow the range of the contractile force, leakage is less likely to occur, and excessive tightening force is less likely to act on the wearer's abdominal side.

[0115] ===Others===

[0116] The above-described embodiments are provided for ease of understanding of the present invention and are not intended to limit or interpret the invention. The present invention can be modified and improved without departing from its spirit, and of course, its equivalents are also included.

[0117] In the above embodiments, a panty-type sanitary napkin 1 was described as an example of a panty-type absorbent article, but the present invention can also be applied to other absorbent articles besides sanitary napkins. For example, panty-type absorbent articles can also be diapers of the underwear type (shorts type) for children and adults, absorbent pads of the underwear type (shorts type), etc.

[0118] In the above-described embodiment, the waist portion 20 is given stretchability in the left-right direction by using the skin-side sheets 22 and 23 of the waist portion 20 as stretch sheets (stretchable nonwoven fabric). However, elastic members other than stretch sheets can also be used to give the waist portion 20 stretchability. For example, the waist portion 20 can also be given stretchability by providing multiple linear elastic members 26 such as rubber filaments, as described below.

[0119] Figure 9A and Figure 9B This figure illustrates the method of mounting the linear elastic member 26 to the waist section 20 using the heat-bonded part pair 60. When mounting the linear elastic member 26 using the heat-bonded part pair 60, a pair of heat-bonded parts 61 and 62 that are adjacent in the vertical direction (longitudinal direction) are arranged as a heat-bonded part pair 60s, and the linear elastic member 26 is clamped in the vertical direction from both sides by means of the heat-bonded part pair 60s.

[0120] exist Figure 9A In the example, a pair of thermally bonded portions 61 and 62 forming the thermally bonded portion pair 60s are arranged with a vertical distance GH60 between them. Furthermore, the size of the distance GH60 is set to be the same size as or slightly larger than the diameter d26t of the linear elastic member 26 in its elongated state (GH60 ≥ d26t). That is, the elongated linear elastic member 26 is arranged between the thermally bonded portions 60s in the vertical direction. Additionally, the distance between two adjacent thermally bonded portions 60s, 60s in the vertical direction can also be larger than GH60. That is, in the case of… Figure 7B In the various configurations of the heat-bonding parts 60 shown, the vertical spacing GH60 can be adjusted only for a pair of heat-bonding parts 60, 60 (heat-bonding part pair 60s) positioned at the position where the linear elastic member 26 is sandwiched between the upper and lower parts.

[0121] like Figure 9B As shown, when the linear elastic member 26 gradually relaxes from the elongated state from this state, the linear elastic member 26 contracts in the left-right direction and expands in the up-down direction. The diameter d26 in the natural state is larger than the vertical distance GH60 of the heat-bonded part at 60S (d26>GH60).

[0122] That is, by means of the heat-bonded portions 61 and 62, the linear elastic member 26 is clamped in the vertical direction. As a result, the linear elastic member 26 is installed on the waist portion 20.

[0123] Even when the waist section 20 is given elasticity as described above, the configuration of the heat-bonded section 60 is changed at a position further in the left-right direction than the pair of side joints 20we, 20we, according to the size of each sanitary napkin 1, and the shape of the pleats formed on the surface of the waist section 20 is changed. Thus, the user can easily identify by appearance that the fit is different according to the size difference.

[0124] Symbol Explanation

[0125] 1. Sanitary napkins (panty-style sanitary napkins, absorbent items)

[0126] 1a Waist opening, 1b Leg opening

[0127] 10 Absorbent Subjects

[0128] 11 Absorbent core, 12 Top sheet, 13 Second sheet, 14 Back sheet, 15 Side sheet, 15t end, 20 Waist section,

[0129] 20f Abdominal side waist area, 20fe End,

[0130] 20b back side waist area, 20be end,

[0131] 20we side joint

[0132] 21 Non-skin side sheet, 21c Non-skin side convex portion,

[0133] 22 skin-side sheet (stretch sheet), 22c skin-side convex part,

[0134] 23 Skin-side sheet (stretch sheet), 23c Skin-side convex part,

[0135] 25 Waist elastic components

[0136] 26 linear elastic components

[0137] 30 Leak-proof wall section

[0138] 31. Leakage wall elastic components

[0139] 40 high-density section

[0140] 41 First high-density section, 42 Second high-density section, 43 Third high-density section, 50 Absorbent elastic component,

[0141] 60s heat-bonded part, 60s heat-bonded part pair,

[0142] 61 Thermally bonded part, 62 Thermally bonded part,

[0143] 100 packages

[0144] 110 Brand Name, 120 Sub-brand Name, 130 Size Marking, R1 Overlapping Area

[0145] R2 non-overlapping region

[0146] CL is located in the center (fold line).

Claims

1. A panty-style sanitary napkin having intersecting vertical and horizontal directions, and having an absorbent body and a waistband, the waistband being formed by joining the abdominal side waistband and the back side waistband at their respective ends in the horizontal direction through a pair of lateral joints. The shorts-type sanitary napkin has a first size. Its features are, The waistband has a skin-side sheet, a non-skin-side sheet, and multiple heat-bonded portions that join the skin-side sheet and the non-skin-side sheet, and the waistband is elastic in the left-right direction. When viewed from above in the unfolded state, at a position inside the left-right direction from the pair of lateral joints, there is an overlapping area where the absorbent body and the waist section overlap, and a non-overlapping area where the absorbent body and the waist section do not overlap. At least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet capable of stretching and contracting along the left-right direction. In the end regions of the overlapping area that overlap with the two ends of the absorbent body in the left-right direction, the total area of ​​the heat-bonded portion per unit area differs between the panty-type sanitary napkin having the first size and other panty-type sanitary napkins having the same brand name and sub-brand name as the panty-type sanitary napkin but having a second size. In the end region, the larger the size of the shorts-type sanitary napkin, the smaller the total area of ​​the heat-bonded portion per unit area.

2. The shorts-type sanitary napkin according to claim 1, characterized in that, The end region is located on the back side.

3. The panty-type sanitary napkin according to claim 1 or 2, characterized in that, The total area of ​​the thermally bonded portions provided per unit area in the end region is less than the total area of ​​the thermally bonded portions provided per unit area in the region located at the same position as the end region in the vertical direction and located inside the end region in the horizontal direction.

4. The panty-type sanitary napkin according to claim 1, characterized in that, The total area of ​​the thermally bonded portions provided per unit area in the end region is greater than or equal to the total area of ​​the thermally bonded portions provided per unit area in the region located at the same position as the end region in the vertical direction and located outside the end region in the horizontal direction.

5. The panty-type sanitary napkin according to claim 1, characterized in that, An elastic waistband component capable of stretching and contracting in the left-right direction is provided at the upper end of the waistband portion. In the non-overlapping area where the waist elastic member is provided, the total area of ​​the heat-bonded portion provided per unit area differs between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

6. The shorts-type sanitary napkin according to claim 5, characterized in that, In the back side waist area, In the non-overlapping area where the waist elastic member is provided, the total area of ​​the heat-bonded portion provided per unit area differs between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

7. The panty-type sanitary napkin according to claim 1, characterized in that, The waist section has a non-skin side sheet made of non-woven fabric and a skin side sheet made of stretchable non-woven fabric, which is laminated on the non-skin side sheet. When the waistline contracts in the left-right direction under natural conditions, it forms a non-skin-side convex portion that protrudes from the non-skin side sheet to the non-skin side and a skin-side convex portion that protrudes from the skin-side sheet to the non-skin side. The shorts-type sanitary napkin has a portion where the skin side of the non-skin side protrusion contacts the non-skin side of the skin side protrusion.

8. The shorts-type sanitary napkin according to claim 1, characterized in that, The overlapping region has a high area ratio, where the total area of ​​the thermally bonded portions per unit area is higher than that of other regions. The shorts-type sanitary napkin has a portion whose width in the left-right direction is smaller than that in the high area ratio region on the back side compared to the width in the left-right direction of the high area ratio region on the abdominal side.

9. The panty-type sanitary napkin according to claim 8, characterized in that, The portion having a smaller width in the left-right direction compared to the width in the right-left direction of the high area ratio region at the lower end in the vertical direction.

10. The panty-type sanitary napkin according to claim 1, characterized in that, The waist section has a portion formed by a single sheet component in the thickness direction, and a plurality of the heat-bonded portions are also provided in this portion formed by the single sheet component.

11. The panty-type sanitary napkin according to claim 1, characterized in that, The absorbent body has an absorbent elastic component that extends and retracts along the vertical direction. The ratio of the length of the portion of the absorbent elastic member acting on the elasticity to the length from top to bottom in the vertical direction of the shorts-type sanitary napkin differs between the shorts-type sanitary napkin having the first size and the shorts-type sanitary napkin having the second size.

12. A set of panty-style sanitary napkins, comprising a first panty-style sanitary napkin having a first size and a second panty-style sanitary napkin having a second size. Its features are, The first and second shorts-type sanitary napkins share the same brand name and sub-brand name, respectively. The first and second shorts-type sanitary napkins have intersecting vertical and horizontal directions, respectively. The first panty-style sanitary napkin and the second panty-style sanitary napkin each have: Absorbent subject; and The waist section is formed by joining the abdominal side waist section and the back side waist section at their two ends in the left-right direction through a pair of lateral joints. The waistband has a skin-side sheet, a non-skin-side sheet, and multiple heat-bonded portions that join the skin-side sheet and the non-skin-side sheet, and the waistband is elastic in the left-right direction. When viewed from above in the unfolded state, at a position inside the left-right direction from the pair of lateral joints, there is an overlapping area where the absorbent body and the waist section overlap, and a non-overlapping area where the absorbent body and the waist section do not overlap. At least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet capable of stretching and contracting along the left-right direction. In the end regions of the overlapping area that overlap with the two ends of the absorbent body in the left-right direction, the total area of ​​the thermally bonded portion per unit area differs between the first shorts-type sanitary napkin and the second shorts-type sanitary napkin. In the end region, the larger the size of the shorts-type sanitary napkin, the smaller the total area of ​​the heat-bonded portion per unit area.

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