TW202308578A - Panty-type sanitary pad, and panty-type sanitary pad group - Google Patents

Abstract

This panty-type sanitary pad (1) comprises an absorbent body (10) and a waist part (20) and which has a first size, wherein the waist part (20) has multiple fusion parts (60) and has extensibility in the horizontal direction; in planar view in an expanded state, there is an overlapping region (R1) where the absorbent body (10) and the waist part (20) overlap, and a non-overlapping region (R2) where these do not overlap. In either the overlapping region (R1) or the non-overlapping region (R2), the total surface area of the fusion parts (60) provided per unit surface area is different from the surface area thereof in another panty-type sanitary pad (1) that has the same brand name and sub brand name as the panty-type sanitary pad (1) and that has a second size.

Description

Underpants sanitary napkins and underwear sanitary napkins

The present invention relates to an underpants type sanitary napkin and an underpants type sanitary napkin group.

In the past, when selling absorbent articles such as underwear-type sanitary napkins, it has been widely carried out to sell product groups with the same brand name and sub-brand name, and multiple sizes such as M size and L size. circulation. And in such an absorbent article, there is known a method of realizing good fit in accordance with each size by adjusting the strength of stretchability for each size, and the like. For example, Patent Document 1 discloses that in absorbent articles of different sizes, by changing the force distribution of the elastic member (elastic twisted yarn) provided at the waist (waistband) to adjust the elastic coefficient, to achieve appropriate wearability. means. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2016-523634

[Problem to be solved by the invention]

As in Patent Document 1, even if the stretchability in the waist portion is changed in the underpants-type sanitary napkins of different sizes, there is a problem that the difference in stretchability is difficult to recognize in appearance. That is, it is difficult for the user to judge how the fit of the absorbent article differs depending on the size.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide different underpants-type sanitary napkins whose fitability can be easily recognized from the appearance according to the difference in size. [Technical means to solve the problem]

The main invention for achieving the above object is an underpants type sanitary napkin, which has a first size, and has vertical and horizontal directions intersecting each other, and has: an absorbent main body, and a waist portion, which is in the aforementioned left and right directions. Both ends are formed by joining the abdominal waist part and the back waist part with each other through a pair of side joint parts. The underwear-type sanitary napkin is characterized in that the waist part has: a skin side sheet and a non-skin side sheet , and the plurality of welded parts joining the aforementioned skin-side sheet and the aforementioned non-skin-side sheet, and having stretchability in the aforementioned left-right direction, viewed from a plan view in an unfolded state, the pair of side joining parts closer to the aforementioned left-right direction than the pair of side joint parts The inner side has an overlapping area where the absorbent body and the waistline overlap, and a non-overlapping area where the absorbent body and the waistline do not overlap, and either one of the overlapping area and the non-overlapping area is divided per unit area. The total area of the welded portion provided has the same brand name and sub-brand name as the underpants type sanitary napkin, and is different from the aforementioned area in other underpants type sanitary napkins having the second size. Other characteristics of the present invention will be apparent from the descriptions in this specification and the attached pages. [Effect of the invention]

According to the present invention, it is possible to provide different underpants type sanitary napkins in which the fit can be easily recognized from the appearance depending on the difference in size.

From the description of this specification and the attached pages, at least the following matters are clear. An underpants-type sanitary napkin having a first size, having vertical and horizontal directions intersecting each other, and having: an absorbent main body, and a waist portion formed by a pair of sides at both ends of the horizontal direction The joint part is formed by joining the abdominal waist part and the back waist part. The underwear-type sanitary napkin is characterized in that the waist part has: a skin side sheet, a non-skin side sheet, and the skin side sheet and the aforementioned skin side sheet. The plurality of welded parts of the non-skin side sheet has stretchability in the aforementioned left and right directions, and when viewed from above in an unfolded state, the aforementioned pair of side joining parts are located on the inner side of the aforementioned left and right directions: the aforementioned absorbent main body and the aforementioned In the overlapping region where the waist parts overlap and the non-overlapping region where the absorbent main body and the waist part do not overlap, the total area of the welded parts provided per unit area in either of the overlapping region and the non-overlapping region, It has the same brand name and sub-brand name as the aforementioned underpants type sanitary napkin, and is different from the aforementioned area in other underpants type sanitary napkins having the second size.

According to such an underpants-type sanitary napkin, the area (area ratio) of the welded part provided per unit area is reduced as much as possible in a large-sized sanitary napkin, and the waist part is easily deformed according to the unevenness of the wearer's body. And it is easy to obtain a good fit. On the other hand, in a sanitary napkin with a small size, since the unevenness of the wearer's body is small, even if the area ratio of the welded part is increased, it is easy to obtain a good fit of the waist part. The area ratio makes it easy to maintain the deformed shape of the waist when it fits the body. Therefore, by changing the area ratio of the welded portion according to the difference in the size of the sanitary napkin, the difference in fit can be easily recognized from the appearance.

In such an underpants-type sanitary napkin, at least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet that can be stretched in the left-right direction, and is aligned with both sides of the absorbent main body in the left-right direction in the overlapping region. In the end region where the ends overlap, the total area of the welded portion provided per unit area is desirable when the underpants-type sanitary napkin having the first size is different from the underpants-type sanitary napkin having the second size. .

According to such an underpants-type sanitary napkin, the smaller the area ratio of the welded portion in the end region, the easier it is for the stretchability of the waist portion to act on the absorbent body, and it is less likely to cause a gap between the absorbent body and the wearer's skin. gap. In addition, the larger the area ratio of the welded portion in the end region, the less likely the excessive stretchability will act on the absorbent main body, and it is possible to suppress the traces of the elastic member from adhering to the wearer's skin or causing a sense of discomfort. Therefore, by varying the area ratio of the welded portion in the end region according to the size of the sanitary napkin, the difference in the fit of the absorbent main body and the difference in the difficulty of side leakage can be easily recognized from the appearance.

In such an underpants type sanitary napkin, it is desirable that the total area of the welded portions provided per unit area in the end region be smaller as the sanitary napkin is larger in size.

According to such an underpants type sanitary napkin, by reducing the area ratio of the welded portion in the end region, the stretchability of the waist portion can be easily applied to the end region. Therefore, even in a large-sized sanitary napkin, both ends of the absorbent main body are easily fitted to a wide range of the wearer's buttocks, and it is easy to recognize from the appearance that it has high fit.

In such an underpants type sanitary napkin, it is desirable that the aforementioned end region is provided on the back side.

According to such an underpants-type sanitary napkin, since the end region is provided on the back side, it is difficult to generate a gap between the both ends of the absorbent main body and the wearer's skin in a wide range of the buttocks when worn, And it is easy to know from the appearance that it has high adhesion.

In such an underpants-type sanitary napkin, the total area of the welded portions provided per unit area in the end region is located at the same position as the end region in the vertical direction and at the same position in the left-right direction. The area inside the end area is preferably equal to or less than the total area of the welded portions provided per unit area.

According to such an underpants type sanitary napkin, because the area ratio of the welded portion is large on the inside of the end region, the waist portion and the absorbent main body are not easily shrunk, so the absorbent main body can be easily attached to the body of the wearer. combine. On the other hand, in the end region, since the area ratio of the welded portion is small, the waist portion is easy to expand and contract, so pressing both ends of the absorbent main body toward the wearer's body can easily suppress side leakage of excrement. wait.

In such an underpants type sanitary napkin, in the end region, the total area of the welded portions provided per unit area is at the same position as the end region in the vertical direction and at the end in the left-right direction. It is desirable that the area outside the portion area is equal to or greater than the total area of the aforementioned welded portions provided per unit area.

According to such an underpants type sanitary napkin, excessive expansion and contraction of the waist portion can be more easily suppressed on both outer sides of the end region than in the end region. Therefore, it is suppressed that the uniformity of the appearance shape is lost among sanitary napkins of different sizes. Thereby, while maintaining the appearance as a tampon group, the fit can be improved according to the shape of the wearer's body.

In such an underpants-type sanitary napkin, a waist elastic member capable of stretching in the left and right directions is provided on the upper end of the waist portion, and the region where the waist elastic member is provided in the non-overlapping region is provided per unit area. It is desirable that the total area of the said weld part differs between the said underpants type sanitary napkin which has the said 1st size, and the said underwear type sanitary napkin which has the said 2nd size.

According to such an underpants-type sanitary napkin, when wearing it, the upper end of the abdominal waist and the back waist must be firmly attached to the wearer's waist. The size is different, so the user can easily know the difference in fit around the waist due to the difference in the size of the sanitary napkin from the appearance.

In such an underpants-type sanitary napkin, in the region where the waist elastic member is provided in the non-overlapping region in the back waist portion, the total area of the welded portions provided per unit area is greater than the first size. It is desirable that the said underpants type sanitary napkin is different from the said underpants type sanitary napkin which has the said 2nd size.

According to such an underpants-type sanitary napkin, in the back waist part, the size of the bulge of the wearer's buttocks becomes larger due to the difference in the size of the sanitary napkin, so in the region overlapping with the waist elastic member, Since the area ratio of the welded part is different for each size of the sanitary napkin, it is easy to judge from the appearance that the fit to the bump of the buttocks may vary depending on the size of the sanitary napkin.

In such an underpants type sanitary napkin, the waist portion has a non-skin side sheet formed of a non-woven fabric, and a skin side sheet formed of a stretchable non-woven fabric laminated on the skin side of the non-skin side sheet, and in a natural state, When the aforementioned waist portion shrinks in the left-right direction, the non-skin side convex portion after the non-skin side sheet is convexly deformed toward the non-skin side and the skin side convex portion after the aforementioned skin side sheet is convexly deformed toward the non-skin side are formed, And have the skin side of above-mentioned non-skin side convex portion, the part that contacts with the non-skin side of skin side convex portion.

According to such an underpants type sanitary napkin, the skin-side convex portion of the skin-side sheet is filled inside (skin side) of the gathers formed by the non-skin-side convex portion of the non-skin-side sheet. Thereby, since the shape of a wrinkle is easy to be recognized stably, a user can intuitively understand the difference in fitting property by the difference in the size of a sanitary napkin easily.

In such an underpants-type sanitary napkin, the overlapping region has a high area ratio region in which the total area of the welded portions provided per unit area is higher than other regions, and has the aforementioned high area ratio region on the back side. It is desirable that the width in the left-right direction is smaller than the change in width in the left-right direction of the high area ratio region on the ventral side.

According to such an underpants-type sanitary napkin, since the area ratio of the welded portion is narrower on the back side than on the abdomen side, the waist portion and the absorbent main body are easily deformed. Therefore, the tampon can be firmly attached even to the back side, which is more concave-convex than the abdomen side, due to the bulge of the buttocks.

In such an underpants-type sanitary napkin, it is desirable to have a portion in which the width in the left-right direction of the high-area ratio region is smaller than that in the lower end in the vertical direction.

According to such an underpants-type sanitary napkin, the area ratio of the welded part is increased as much as possible in the crotch part of the lower end in the vertical direction to increase the rigidity, thereby maintaining the rigidity of the absorbent body at a high level. Even when the legs are sandwiched, it is easy to suppress the twisting of the absorbent main body. On the other hand, since the back side of the crotch part has larger unevenness due to the swell of the buttocks, etc., the waist part and the absorbent main body are easily deformed, and good fit can be easily realized.

In such an underpants type sanitary napkin, it is desirable that the waist portion has a portion formed of a single sheet member in the thickness direction, and a plurality of the welded portions are also provided in the portion formed of the single sheet member.

According to such an underpants type sanitary napkin, a plurality of welded portions are provided in the waist portion formed by a single sheet member to increase the rigidity of the sheet member, and it is easy to accurately cut leg openings in the manufacturing process of the sanitary napkin. Thereby, the external appearance (shape of the leg opening) of a sanitary napkin can be made favorable.

In such an underpants type sanitary napkin, the absorptive main body has an absorber elastic member that expands and contracts in the vertical direction, and the length of the stretchable portion caused by the absorptive elastic member is longer than that of the underpants type sanitary napkin. The ratio of the length from the upper end to the lower end in the vertical direction differs between the underpants type sanitary napkin having the first size and the underpants type sanitary napkin having the second size.

According to such an underpants type sanitary napkin, by adjusting the effective length of the absorbent elastic member, it is easy to match the appearance size of the absorbent body to each sanitary napkin of a different size, and in fact, it is easy to suppress the aftereffect of the absorbent body. Leak and so on.

Also, a panty-type sanitary napkin group, which clearly includes: a first panty-type sanitary napkin having a first size, and a second panty-type sanitary napkin having a second size, and the underwear-type sanitary napkin group is characterized by: The first underwear-type sanitary napkin and the second underwear-type sanitary napkin have the same brand name and sub-brand name, respectively, and each of the first underwear-type sanitary napkin and the second underwear-type sanitary napkin has vertical and vertical directions intersecting each other. left and right direction, and has: an absorbent main body; and a waist part, which is formed by joining the abdominal side waist part and the back side waist part through a pair of side joint parts at the two ends of the aforementioned left and right direction. The part has: a skin-side sheet, a non-skin-side sheet, and a plurality of welded parts joining the aforementioned skin-side sheet and the aforementioned non-skin-side sheet, and has stretchability in the aforementioned left-right direction. The pair of side joints have an overlapping area on the inner side of the left-right direction: an overlapping area where the absorbent body and the waistline overlap, and a non-overlapping area where the absorbent body and the waistline do not overlap. In either of the overlapping regions, the total area of the welded portion provided per unit area is different between the first underpants type sanitary napkin and the second underpants type sanitary napkin.

According to such an underpants-type sanitary napkin, the area (area ratio) of the welded part provided per unit area is reduced as much as possible in a large-sized sanitary napkin, and the waist part is easily deformed according to the unevenness of the wearer's body. , and easy to obtain a good fit. On the other hand, in a sanitary napkin with a small size, since the unevenness of the wearer's body is small, even if the area ratio of the welded part is increased, it is easy to obtain a good fit of the waist part. The area ratio makes it easy to maintain the deformed shape of the waist when it fits the body. Therefore, by changing the area ratio of the welded portion according to the difference in the size of the sanitary napkin, the difference in fit can be easily recognized from the appearance.

===Implementation form=== An example of the underpants-type absorbent article according to the embodiment of the present invention will be described with respect to the underpants-type sanitary napkin 1 (hereinafter also simply referred to as "the sanitary napkin 1").

＜Basic structure of sanitary napkin 1＞ Fig. 1 is a schematic perspective view of a sanitary napkin 1 according to this embodiment. Fig. 2 is a plan view of the sanitary napkin 1 in an unfolded and stretched state viewed from the skin side in the thickness direction. FIG. 3 is a schematic cross-sectional view along line A-A of FIG. 2 .

In addition, the "extended state" of the sanitary napkin 1 means that each elastic member (for example, the absorbent elastic member 50 described later, the skin-side sheets 22, 23, etc.) included in the sanitary napkin 1 is stretched, and the entire sanitary napkin 1 (product) is stretched. The whole) is stretched to a state where there are no wrinkles. Specifically, it means that the size of each member constituting the sanitary napkin 1 (for example, the non-skin side sheet 21 and the skin side sheet 22, 23, etc. described later) is stretched to the same size as the member alone. The size is the same as or close to this size.

The sanitary napkin 1 has mutually orthogonal "upper and lower directions", "left and right directions" and "front and rear directions" as shown in Fig. 1 . Moreover, as shown in FIG. 3, it has the thickness direction which is the direction in which each member is laminated|stacked. In the vertical direction, when the wearer is wearing the sanitary napkin 1 , the side that becomes the waistline side of the wearer is defined as the "upper side", and the side that becomes the crotch of the wearer is defined as the "lower side". Also, in the front-rear direction, the side that becomes the ventral side of the wearer at the time of wearing is referred to as the "front side", and the side that becomes the back side of the wearer is referred to as the "rear side". Moreover, when the wearer wears the sanitary napkin 1 in the thickness direction, the side in contact with the wearer's skin is referred to as the "skin side", and the opposite side is referred to as the "non-skin side".

In addition, the sanitary napkin 1 has "vertical" and "horizontal" orthogonal to each other in the unfolded state shown in Fig. 2 . "Longitudinal" is the direction along the up-down direction in the underpants type, and "horizontal" is the direction along the left-right direction in the underpants type.

The sanitary napkin 1 of the present embodiment is provided with: a liquid-absorbent absorbent main body 10 that absorbs liquids such as menstrual blood; When used, it is configured around the waist of the wearer.

(absorbent body 10) FIG. 4 is a top view and a cross-sectional view of the absorbent main body 10 . As shown in FIG. 2 , the absorbent main body 10 of this embodiment has a longitudinal direction (that is, the longitudinal direction of the absorbent main body 10 ) in a substantially rectangular shape in plan view along the vertical direction of the sanitary napkin 1 . And, as shown in FIGS. 3 and 4 , the absorbent main body 10 has: an absorbent core 11 along the longitudinal direction (vertical direction); The second sheet 13 between the top sheet 12 and the absorbent core 11, the back sheet 14 arranged on the non-skin side of the absorbent core 11, and the side sheet arranged on the non-skin side of the back sheet 14 15.

The absorbent core 11 is a member that absorbs and holds liquid such as menstrual blood, and is formed, for example, of liquid-absorbent fibers such as pulp fibers mixed with superabsorbent polymer (SAP). In addition, the absorptive core 11 may be covered with a liquid-permeable sheet member (core covering sheet) such as tissue paper or nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet member capable of contacting the wearer's skin when worn, and is formed of, for example, a hydrophilic air-through nonwoven fabric, a spunbonded nonwoven fabric, or the like. In the present embodiment, as shown in the cross-sectional view of FIG. 4 , both end portions in the left-right direction of the top sheet 12 are folded from the skin side in the thickness direction toward the non-skin side on both outer sides of the absorbent core 11 in the left-right direction, and It is configured to be sandwiched between the absorptive core 11 and the back sheet 14 .

The second sheet 13 is a sheet member having substantially the same function and structure as the top sheet 12 , and is laminated on the non-skin side of the top sheet 12 . In addition, in the absorbent main body 10, the second sheet 13 may not necessarily be provided.

The back sheet 14 is an air-permeable and liquid-impermeable sheet member for preventing liquid such as menstrual blood absorbed by the absorbent core 11 from leaking to the outside, and is formed of, for example, a resin film or the like.

The side sheet 15 is a sheet member laminated on the non-skin side of the back sheet 14, and for example, a hydrophobic nonwoven fabric such as SMS (spunbond-meltblown-spunbond) nonwoven fabric can be used. Moreover, in this embodiment, the side sheet 15 forms a pair of leak-proof wall parts 30,30.

The leak-proof wall parts 30 are provided in a pair on both sides in the left-right direction of the absorbent main body 10, which is a part corresponding to a so-called three-dimensional hemming. When the sanitary napkin 1 is worn, the leak-proof wall portion 30 stands up from both sides in the left-right direction of the absorbent main body 10 toward the wearer's skin side, thereby preventing excretion fluid such as menstrual blood from leaking into the absorbent main body 10. situation on the outside.

In this embodiment, as shown in the cross-sectional view of FIG. 4 , the side sheets 15 extend toward both outer sides in the left-right direction (horizontal direction) of the absorbent core 11 , and extend toward the thickness direction at both ends in the left-right direction of the absorbent main body 10 . The skin side of the absorbent core 11 is bent, and the end portion 15t is arranged closer to the skin side than the absorptive core 11 . Furthermore, as shown in FIG. 4 , the end portion 15 t is in a state of being laminated in the thickness direction by folding the side sheets 15 , and the leak-proof wall elastic member 31 is provided between the laminated side sheets 15 , 15 . When the sanitary napkin 1 is worn, the end 15t of the leak-proof wall 30 shrinks in the longitudinal direction (vertical direction) according to the stretchability produced by the leak-proof wall elastic member 31, so that the free end side of the end 15t Stands up towards the skin side of the wearer.

Moreover, the high density part 40 in which the density of the absorptive core 11 is higher than the surrounding part is provided in the absorptive main body 10. As shown in FIG. The high-density portion 40 is formed by pressing each member constituting the absorbent main body 10 in the thickness direction. The high-density section 40 of the present embodiment, as shown in FIG. 4 , has a linear first high-density section 41, a second high-density section 42, and The third high-density part 43 . By providing such a high-density part 40, it can suppress that the liquid-absorbent fiber of the absorptive core 11 loosens and collapses in shape. In addition, when the sanitary napkin 1 is worn, the high-density portion 40 becomes the starting point of bending, and the absorbent core 11 is easily deformed in three dimensions according to the shape of the wearer's body, so that it is easy to conform to the body shape of the wearer. for fit.

In addition, the absorbent body 10 is provided with a plurality of absorbent elastic members 50 that expand and contract in the longitudinal direction (vertical direction). The absorbent elastic member 50 is formed of thread rubber, for example, and is stretched in the longitudinal direction (up-down direction) on the non-skin side (specifically, between the back sheet 14 and the side sheet 15) of the absorbent core 11. is configured. The sanitary napkin 1 of this embodiment is, as shown in FIG. 4 , five absorbent elastic members 50 provided at predetermined intervals in the left-right direction. The elongation ratio of the absorbent elastic member 50 is preferably about 2.7 to 3.2 times. In addition, the "elongation ratio" of the elastic member is a value obtained by dividing the length of the elastic member in the stretched state by the length of the elastic member in the natural state. The elongation ratio of the absorbent elastic member 50 is set to be stronger than that of the leak-proof wall elastic member 31, and the absorbent main body 10 is easy to shrink from the non-skin side in the thickness direction, and when the sanitary napkin 1 is worn, the absorbent main body can 10 It is easy to fit the wearer's body. That is, the stretchability of the absorbent elastic member 50 makes it easy for the absorbent body 10 to be in close contact with the crotch of the wearer, thereby making it difficult for excrement such as menstrual blood to leak.

(waist part 20)

The waist portion 20 is constituted by one or a plurality of sheet members, and in this embodiment includes a non-skin side sheet 21 and skin side sheets 22 and 23 (see FIG. 3 ). In addition, in the following description, in the longitudinal direction of the waist portion 20, the portion on the front side (abdominal side) than the central position CL is also referred to as the abdominal waist portion 20f, and the portion on the rear side (back side) than the central position CL is also referred to as the waist portion 20f. side) is referred to as the back waist portion 20b.

The non-skin side sheet 21 is a non-stretchable sheet member disposed on the most non-skin side of the sanitary napkin 1, and is formed of, for example, a spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In the present embodiment, the non-skin side sheet 21 has a shape that narrows inward in the left-right direction in the longitudinal central portion (including the central position CL) as shown in plan view in FIG. 2 .

The skin-side sheet 22 has an elastic sheet member (stretchable sheet) laminated on the skin side of the non-skin-side sheet 21 on the longitudinal front side (abdominal side). The skin side sheet 22 (stretchable sheet) is formed of stretchable nonwoven fabric, for example. "Stretchable nonwoven fabric" is a nonwoven fabric that includes stretchable fibers with stretchability and extensible fibers that are less shrinkable than stretchable fibers, and is subjected to appropriate stretching treatment such as gear calendering. In the skin-side sheet 22 of this embodiment, fibers of a polyurethane-based elastomer, which is a kind of elastic thermoplastic elastomer, can be used as stretchable fibers, and fibers of a polyolefin-based resin, which is a kind of non-elastic thermoplastic resin, can be used. Fibers of propylene (PP) were used as extensible fibers.

The skin-side sheet 22 is bonded to the non-skin-side sheet 21 by a plurality of welded portions 60 (see FIG. 7 ) arranged in a predetermined pattern, whereby at least the abdominal waist portion 20f is given a horizontal direction along the left-right direction. Scalability. In the present embodiment, the welded portion 60 is formed using known joining means such as ultrasonic welding. The details of the arrangement pattern of the welded portion 60 will be described later.

The skin-side sheet 23 has a stretchable sheet member laminated on the skin side of the non-skin-side sheet 21 on the rear side (back side) in the longitudinal direction. 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 stretchable non-woven fabric, and is bonded to the non-skin-side sheet 21 by a plurality of welded portions 60 (refer to FIG. 6 ) dispersed. Thereby, at least the stretchability in the left-right direction is given to the back side waist part 20b.

In addition, waist elastic members 25 such as thread rubber or the like are provided on the upper ends of the abdominal waist portion 20f and the back waist portion 20b so as to be stretchable in the left-right direction. By providing such a waist elastic member 25, the fit property in the waist opening 1b is further improved, and the position shift of the waist part 20 can be suppressed when the sanitary napkin 1 is worn. At least a part of the waist elastic member 25 is desirably disposed so as to overlap with the skin-side sheets 22 and 23 respectively when viewed in the thickness direction (see FIGS. 2 and 3 ). In this way, the left-right stretchability of the waist elastic member 25 and the left-right stretchability of the skin-side sheets 22 and 23 can further improve the fit of the sanitary napkin 1 around the wearer's waist.

Sanitary napkin 1 is from the unfolded state shown in FIG. 2 , taking the central position CL (shown by a dot chain line in FIG. 2 ) of the absorbent main body 10 as the folding position, and the absorbent main body 10 and the waist portion 20 are folded. Fold in half lengthwise (front to back). In this folded state, the lateral (left and right) ends 20fe, 20fe of the abdominal waist portion 20f superimposed in the front-rear direction are joined to the lateral (left and right) ends 20fe of the back waist portion 20b using known joining means such as sealing welding. Left-right direction) both end portions 20be, 20be form side joint portion 20we. Thereby, the folded waist portion 20 (20f and 20b) is connected in a ring shape at the front side (abdominal side) and the rear side (back side), and a waist opening 1a and a pair of leg circumferences as shown in FIG. 1 are formed. The opening 1b becomes the sanitary napkin 1 of panty type.

In addition, the underpants type sanitary napkin 1 of this embodiment is distributed in the market as a sanitary napkin group having a plurality of sizes. For example, in the stretched and unfolded sanitary napkin 1 shown in FIG. 2 , the length L1 in the longitudinal direction and the length W1 in the transverse direction are appropriately changed to form S size, M size, L size, Plural types of sanitary napkins such as XL size 1. And the sanitary napkin group which has these plural types of sizes is distributed in the market with the same brand name and sub-brand name indicated.

FIG. 5 is a diagram showing an example of packaging when the sanitary napkin 1 is distributed in the market. The sanitary napkin 1 is distributed in the market as a packaging body 100 (packaging bag) in which a plurality of sanitary napkins 1 of the same size are packaged. The packaging body 100 is formed by forming packaging materials such as SMS non-woven fabrics and resin films into a bag shape as shown in FIG. At least a brand name 110 , a sub-brand name 120 , and a size symbol 130 are marked on the surface of the package 100 . The brand name 110 shows the information of the product name of the sanitary napkin group including the sanitary napkin 1, such as "Sophi (Sophie) (registered trademark)" and the like. The sub-brand name 120 displays information on different product names within the same brand, for example, "Super Sleep". The size symbol 130 shows information on the size of the underpants-type sanitary napkin 1 , for example, the above-mentioned sizes of S, M, L, and XL.

In the package 100 of the underwear-type sanitary napkin 1, the brand name 110 and the sub-brand name 120 are common to the underwear-type sanitary napkin 1 of all sizes. On the other hand, the size symbol 130 differs depending on the size of the sanitary napkin 1 . For example, the package 100 of the L-size underpants type sanitary napkin 1 is different from the package 100 of the XL size underpants-type sanitary napkin 1 , but the brand name 110 and sub-brand name 120 are the same. When the user sees such a package 100 at a retail store, etc., he or she can select a desired brand of underwear-type sanitary napkin 1 (for example, "Sophie (Sophie)", "Super Sleep", etc.) without mistake. product in the desired size. In addition, sanitary napkins are worn on the underwear according to the amount of menstrual blood. Although the same brand of different lengths such as daily use and night use is used, the underwear-type sanitary napkins in this embodiment are used to fit the waistline. By. Therefore, it is important to be able to purchase the underpants type sanitary napkin 1 of an appropriate size without mistake.

In the past, sanitary napkins with multiple types of sizes had the same basic structure and appearance, so it was difficult for users to understand the difference in fit due to the size of the sanitary napkin at a glance. How is it different. For example, in absorbent articles such as underpants-type sanitary napkins of different sizes and underpants-type paper diapers that are generally sold, even if the elongation ratio of the elastic member (stretchable sheet, etc.) is changed, the absorbent article that appears to be the same in appearance Therefore, it is difficult for the user to grasp the difference in the fitting property at a glance based on the difference in size.

Here, in the sanitary napkin 1 of the present embodiment, by changing the arrangement pattern of the welded portion 60 for each size, the difference in fit due to the difference in size can be easily recognized from the appearance. Hereinafter, the relationship between the welded portion 60 and adhesiveness will be described.

<The relationship between the size of the sanitary napkin 1 and the arrangement pattern of the welded part 60> FIG. 6 is a plan view showing the pattern arrangement of the welded portion 60 . In addition, this FIG. 6 shows the state in which the base material sheets (the non-skin side sheet 21 and the skin side sheets 22, 23) constituting the waist portion 20 are joined in the thickness direction by the welding part 60 in the manufacturing process of the sanitary napkin 1. . That is, FIG. 6 shows the waist portion 20 before cutting for forming the leg opening 1b.

When viewing the expanded and stretched waist portion 20 (sanitary napkin 1) shown in FIG. 6 in the thickness direction (plan view), the area where the absorbent main body 10 and the waist portion 20 overlap is defined as the overlapping region R1 (thick line in FIG. 6 ). The area inside the absorbent body 10 and the waistline 20 are defined as the non-overlapping area R2 (the area outside the thick line in FIG. 6 ). Then, the sanitary napkin 1 is divided into three areas of A, B, and C. In FIG. 6 , in the non-overlapping region R2 , the portion hatched with oblique lines is defined as a region A. As shown in FIG. In the overlapping region R1, the cross-hatched portion overlapping with both ends of the absorbent main body 10 in the left-right direction is defined as a region C (hereinafter, the region C is also referred to as "end region"). Moreover, the part other than the area|region A and area|region C (end part area) is made into area|region B in the sanitary napkin 1. As shown in FIG.

7A and 7B are diagrams illustrating three types of arrangement patterns of the welded portion 60 . FIG. 7A is a table showing the relationship between the size of the sanitary napkin 1 and the arrangement pattern of the welded portions 60 provided in the regions A to C of FIG. 6 . In addition, although three types of sizes of M, L, and XL are exemplified in FIG. 7A , other sizes (for example, S) may be used. FIG. 7B shows three types of arrangement patterns formed on the welded portion 60 of the sanitary napkin 1 . Patterns 1 to 3 in FIG. 7B are all formed by intermittently arranging a plurality of welding portions 60 . In addition, in each pattern, the size and shape of each welded portion 60 are different. Therefore, among these three patterns, the total area (hereinafter also referred to as "area ratio") of the welded portion 60 provided per unit area is different. Specifically, among the three patterns, 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.

In the sanitary napkin 1, in at least any one of the region C (overlapping region R1) and the region A (non-overlapping region R2) in FIG. In other words, in a sanitary napkin 1 of a certain size, the total area (area ratio) of the welded portion 60 provided per unit area in the area C or area A is the same as that in the area C or area A for a sanitary napkin 1 of another size. A is different according to the total area (area ratio) of the welded portion 60 provided per unit area.

For example, in the area A of the sanitary napkin 1 of L size, the welded portion 60 with the pattern 2 is provided, whereas in the area A of the sanitary napkin 1 of the XL size, the welded portion 60 with the pattern 3 is provided (refer to Figure 7A). That is, the area ratio of the welded portion 60 in the region A of the XL size sanitary napkin 1 is smaller than the area ratio of the welded portion 60 in the region A of the L size sanitary napkin 1 . In the waist portion 20, the region A does not overlap with the absorbent main body 10 and is likely to directly contact the wearer's skin during wearing. Moreover, the smaller the area ratio of the welded portion 60 provided on the waist portion 20, the smaller the ratio of the joined non-skin side sheet 21 to the skin side sheets 22, 23, so the rigidity of the waist portion 20 is low, and deformation is easy to occur and easy to deform. conforms to the wearer's body.

Here, in the sanitary napkin 1 of XL size, the area ratio of the welded portion 60 is reduced as much as possible in the region A (pattern 3), and the waist portion 20 can be deformed according to the large unevenness of the wearer's body. Thereby, even the sanitary napkin 1 of XL size having a large area to cover the wearer's skin can achieve good fit. On the other hand, the sanitary napkin 1 of the L size (M size) has a smaller covering area than the XL size, and since the unevenness of the wearer's body is also small, even if the area ratio of the welded portion 60 is increased (pattern 2), It is easy to maintain good fit of the waist portion 20 . In addition, by increasing the area ratio of the welded portion 60, the deformed shape of the waist portion 20 at the time of fitting to the body can be easily maintained.

Thereby, good fit can be realized for each of the sanitary napkins 1 of different sizes. Furthermore, since the pattern of the welding part 60 is different for each different size, the user can visually recognize that the fit of the sanitary napkin 1 is different. That is, the difference in fit due to the difference in the size of the sanitary napkin 1 can be easily recognized from the appearance.

In addition, since the waist portion 20 of the sanitary napkin 1 has stretchability in the left-right direction, when it shrinks in the left-right direction in a natural state, a plurality of wrinkles are formed on the surface. However, such wrinkles are easier to deform and form because the waist portion 20 is softer, so by making the area ratio of the welded portion 60 different according to the size of the sanitary napkin 1, the wrinkles formed on the waist portion 20 can also be reduced. The shape and size of the pleats are different. Moreover, even if the user sees such wrinkles, he can intuitively understand the difference in fitting properties due to the difference in the size of the sanitary napkin 1 .

In addition, the "natural state" refers to the state when the sanitary napkin 1 is left for a predetermined time. For example, after taking out the sanitary napkin 1 in the product state from the packaging bag, the abdominal waist portion 20f and the back waist portion 20b are pulled toward both sides in the left and right directions, so that the waist portion 20 becomes an "extended state", and the extended state is continued for 15 minutes. Seconds later, release the pull of the sanitary napkin 1 and place it on a flat surface such as a table. Then, the state where such a flat surface was placed for 5 minutes was taken as the natural state.

Also in the area C (end area) of the sanitary napkin 1 (waist portion 20), the total area (area ratio) of the welded portion 60 provided per unit area varies depending on the size of the sanitary napkin. This region C (end region) is a portion located on both sides in the left and right direction on the back side of the absorbent main body 10 in the overlapping region R1 (see FIG. 6 ), that is, when the sanitary napkin 1 is worn, it is along the The part where the hip of the person is configured. Therefore, in the region C, if a gap occurs between the absorbent main body 10 and the wearer's skin, side leakage of excrement and deterioration of fit are likely to occur. In particular, the gap between the absorbent main body 10 and the wearer's skin tends to be larger in a large sanitary napkin such as an XL size than in a small sanitary napkin.

Here, in the present embodiment, the area ratio of the welded portion 60 in the region C (end region) is varied according to the size of the sanitary napkin. For example, the smaller the area ratio of the welded portion 60 is, the easier it is for the waist portion 20 to deform in the region C, and the stretchability by the skin-side sheet 23 (stretchable sheet) tends to act on the absorbent main body 10 . As a result, it is easy to press the absorbent main body 10 against the wearer's skin, so that gaps between the absorbent main body 10 and the skin are less likely to occur. Conversely, as the area ratio of the welded portion 60 is larger, excessive stretchability is less likely to act in the region C, and it is possible to suppress traces of the elastic member from adhering to the wearer's skin or to cause a sense of discomfort on the wearer's skin. According to the size of the area ratio of the welded portion 60 in this way, the difference in fitability and the difference in the difficulty of side leakage between the two sides of the absorbent main body 10 can be easily recognized from the appearance.

As shown in FIG. 7 , in the sanitary napkin 1 of the present embodiment, the area ratio of the welded portion 60 in the region C (end region) decreases as the size of the sanitary napkin increases. In this way, the stretchability of the skin-side sheet 23 (stretch sheet) is easy to act in the area C of the larger sanitary napkin, and a gap is less likely to be formed between the absorbent main body 10 and the wearer's skin. Therefore, both sides of the absorbent main body 10 are easily fitted to a wide range of the wearer's buttocks, and side leakage of excrement such as feces is suppressed, and it is easy to recognize from the appearance that it has high fit. On the other hand, in a sanitary napkin with a small size, since the gap generated between the absorbent main body 10 and the wearer's skin is inherently small, compared with a sanitary napkin with a large size, even if the welded portion in the area C is enlarged, The area ratio of 60 is also easy to achieve good fit, and it is easy to know from the appearance that excessive stretchability is not easy to apply to a narrow range.

In addition, in the sanitary napkin 1, the area|region C (end area|region) is provided in the back side in the longitudinal direction (vertical direction) of an absorptive main body. As described above, this region C (end region) is located at the buttocks region, which has a large area and tends to form a gap with the absorbent main body 10 when the sanitary napkin 1 is worn. Therefore, by providing the region C on the back side, gaps between the both sides of the absorbent main body 10 and the wearer's skin are less likely to occur in the wide range of the buttocks, and it is easy to recognize from the appearance that it has a high fit. sex.

Also, in the overlapping region R1 of the sanitary napkin 1, the area ratio of the welded portion 60 provided in the region C (end region) is at the same position as that of the region C (end region) in the vertical direction (longitudinal direction), and in the left and right directions. The direction (transverse direction) is set to be equal to or less than the area ratio of the welded portion 60 of the portion located inside the region C (end region) (a part of the region B). That is, in the sanitary napkin 1, the stretchability of the waist portion 20 in the region C overlapping the both sides of the absorbent main body 10 is equal to the stretchability of the waist portion 20 in the region B sandwiched by the region C. Sexual size and above. Therefore, on the back side of the sanitary napkin 1, in the central part of the left-right direction in the overlapping region R1, since the waist portion 20 is difficult to expand and contract, the absorbent main body 10 is also difficult to shrink, so the absorbent main body 10 is easy to face to the wearer's body. fit. On the other hand, on both sides in the left-right direction in the overlapping region R1, since the waist portion 20 is easy to expand and contract, and the absorbent main body 10 is pressed against the wearer's body, side leakage of excrement and the like can be easily suppressed.

In addition, the area ratio of the welded portion 60 provided in the region C (end region) is at the same position in the vertical direction (longitudinal direction) as that of the region C (end region), and is located in the region in the left-right direction (horizontal direction). The area ratio of the welded portion 60 in the outer portion of C (end region) (a part of the region A) is equal to or higher. That is, in the sanitary napkin 1, the stretchability of the waist portion 20 in the area C overlapping the both sides of the absorbent main body 10 is equal to that of the waist portion 20 in the area A adjacent to both outer sides of the area C. The size of the elasticity is as follows. Therefore, it is easy to suppress excessive expansion and contraction of the waist portion 20 on both outer sides of the region C. As shown in FIG. In particular, in the large XL size and L size, since the stretchability is equal in the area A and the area C (the pattern of the welded part 60 is the same), the waist part 20 is not easy to stretch excessively, and the hygienic effect in different sizes can be suppressed. Among the cotton, the uniformity of the appearance shape is out of shape. Thereby, while maintaining the appearance, the sanitary napkin group can be improved in fit according to the shape of the wearer's body.

In the overlapping region R1, it is desirable that the width in the left-right direction of the part where the area ratio of the welded part 60 is high is smaller on the back side than on the ventral side. In the sanitary napkin 1 of the present embodiment, the area ratio of the welded portion 60 is higher in the area B in the overlapping area R1 than in other areas (pattern 1). If the area B where the area ratio becomes higher is defined as a high area ratio area, then as shown in FIG. A portion where the width WR1f in the left-right direction of the region (region B) is smaller (WR1f>WR1b). In the portion where such a relationship holds, the area ratio of the welded portion 60 is narrower on the back side than on the abdomen side, so the waist portion 20 and the absorbent main body 10 are easily deformed. Therefore, the sanitary napkin 1 can be firmly attached even to the back side, which is more concave-convex than the abdominal side, due to the swelling of the buttocks.

In the overlapping region R1, the width in the left-right direction of the portion where the welded portion 60 has a high area ratio is desirably smaller on the back side than on the crotch portion (lower end portion in the vertical direction). The sanitary napkin 1 of the present embodiment, as shown in FIG. 6, has a width WR1b in the left-right direction of the high area ratio region (region B) on the back side that is higher than that in the longitudinal center position CL (lower end position in the vertical direction). A portion in which the width WR1c in the left-right direction of the area ratio region (region B) is smaller (WR1c>WR1b). The crotch portion at the lower end in the vertical direction is a portion where the absorbent main body 10 is compressed in the left and right directions by the wearer's legs when the sanitary napkin 1 is worn, making it easy to distort. Here, in the crotch portion, it is desirable to increase the area ratio of the welded portion 60 as much as possible to easily maintain rigidity. On the other hand, on the back side than the crotch part, the unevenness is large due to the bulging of the buttocks as mentioned above, so it is desirable to reduce the area ratio of the welded part 60 and make the waist part 20 and the absorbent main body 10 easy to deform. By doing so, it is possible to suppress twisting of the absorbent main body 10 at the crotch portion while achieving good conformability to unevenness of the body.

In addition, the welded portion 60 is basically formed to join the non-skin side sheet 21 and the skin side sheets 22 and 23 laminated in the thickness direction. However, the welded portion 60 may be formed in a portion where there is no laminated sheet member in the thickness direction. In the sanitary napkin 1, the welded portion 60 is also arranged in the region B of the non-overlapping region R2 in FIG. In the waist portion 20, only one piece of sheet member (non-skin side sheet 21) is formed because of its low rigidity and easy deformation. When cropping, it can be difficult to do it correctly. On the other hand, by forming a pattern of a plurality of welded portions 60 on a part of a single sheet member, the rigidity of the sheet member is increased, and the leg opening 1b can be precisely and easily cut. Thereby, the external appearance (shape of the leg opening b1) of the sanitary napkin 1 can be made favorable. Also, the appearance of the absorbent main body when it is contracted in the longitudinal direction can be improved by the absorbent elastic member 50, and since the size of the leg opening b1 is different depending on the size, it is also possible to use the absorbent elastic member 50 in the The difference in size can be recognized by the shape of the wrinkle generated by the shrinkage of one sheet portion (non-skin side sheet 21 ) located at the leg opening b1 when shrinking in the longitudinal direction.

In addition, in the sanitary napkin 1 of this embodiment, the length (hereinafter also referred to as "effective length") of the portion where the stretchability of the absorbent elastic member 50 is provided in the absorbent main body 10 is determined for each size of the sanitary napkin 1. Each is different. Specifically, the effective length of the absorptive elastic member 50 with respect to the length (so-called crotch size) from the upper end to the lower end in the up-down direction of the sanitary napkin 1 differs for every size. For example, in FIG. 2 , the effective length L50 of the absorbent elastic member 50 is appropriately adjusted according to the length of the crotch size (L1×1/2) of the sanitary napkin 1 . Assuming that the effective length of the absorbent elastic member 50 is the same in a full-sized sanitary napkin 1, the ratio of the absorbent main body 10 to the crotch portion of the sanitary napkin 1 differs for each size, resulting in a distorted appearance. The balance deteriorates, or the absorption performance by the absorbent main body 10 deteriorates, and there is a possibility of leakage of excrement. For this, in this embodiment, by adjusting the effective length of the absorbent elastic member 50, it is easy to combine sanitary napkins 1 of different sizes according to the proportion occupied by the absorbent main body 10, and it is also possible to suppress the actual occurrence of excretion in the absorbent main body 10. The case of material leakage.

Moreover, in the sanitary napkin 1, since the shape of the gathers formed on the surface of the waist portion 20 is not easily collapsed, the user can easily recognize that different gathers are formed for each size. FIG. 8 is a diagram illustrating wrinkles formed on the surface of the waist portion 20 of the sanitary napkin 1 . FIG. 8A shows a schematic cross-sectional view of the waist portion 20 in an extended state, and FIG. 8B shows a schematic cross-sectional view of the waist portion 20 in a contracted state with wrinkles formed.

The waist portion 20 has a two-layer structure in which skin-side sheets 22 and 23 made of stretchable non-woven fabric (stretchable sheet) are laminated on the skin-side of a non-woven fabric non-skin-side sheet 21 . When the waist portion 20 is stretched, the laminated sheet members as shown in FIG. 8A are all flat. In this state, when the waist portion 20 contracts in the left-right direction according to the contraction force of the elastic sheet (skin-side sheets 22, 23), a non-skin-side sheet 21 is formed to be convexly deformed toward the non-skin side in the thickness direction. side convex portion 21c. The non-skin side convex portion 21c becomes a gather of the waist portion 20 . Also, although the skin-side sheet 22 (23) (stretchable non-woven fabric) contains extensible fibers with low shrinkage, the extensible fibers are not easy to shrink in the left-right direction, so a part of the skin-side sheet 22 (23) and Similarly, the non-skin side sheet 21 is convexly deformed toward the non-skin side in the thickness direction to form the skin side convex portion 22c (23c).

8B, the non-skin side of the skin-side convex portion 22c (23c) of the skin-side sheet 22 (23) contacts the skin side of the non-skin-side convex portion 21c of the non-skin side sheet 21. That is, the inner side (skin side) of the non-skin side convex portion 21c of the non-skin side sheet 21 is filled with the skin side convex portion 22c (23c) of the skin side sheet 22 (23). Thereby, since the shape of a wrinkle becomes stable easily, and a user can visually recognize a wrinkle, it becomes easy to intuitively understand the difference in fitting property by the difference in the size of the sanitary napkin 1 .

Also, in Fig. 6, the sanitary napkin 1 is divided into three regions A to C, and the configuration pattern of the welded portion 60 provided in the region is changed according to each size of the sanitary napkin 1, however, in A to C The layout pattern of the welded portion 60 may be changed in other areas than the above. For example, the arrangement pattern of the welded portion 60 may be different for each size of the sanitary napkin 1 in a region overlapping with the waist elastic member 25 provided at the upper ends of the abdominal waist portion 20f and the back waist portion 20b. In other words, in the non-overlapping region R2 of the waist portion 20 , the area ratio of the welded portion 60 per unit area provided at the portion overlapping with the waist elastic member 25 may be different for each size of the sanitary napkin 1 . The upper ends of the abdominal waist portion 20f and the back waist portion 20b are portions that must be firmly fitted to the wearer's waist when the sanitary napkin 1 is worn. Therefore, in this part, the area ratio of the welded portion 60 differs for each size of the tampon 1 , so the user can easily recognize the difference in fit around the waist by the appearance according to the difference in the size of the tampon 1 .

In particular, in the back side waist part 20b, the size of the bulge of the wearer's buttocks becomes larger due to the difference in size of the sanitary napkin 1, so the back side waist part 20b must be firmly aligned with the bulge of the buttocks. fit. Therefore, it is desirable to vary the area ratio of the welded portion 60 for each size of the sanitary napkin 1 in a region overlapping with the waist elastic member 25 provided at the upper end of the back waist portion 20b. Thereby, it is easy to judge from the appearance that the conformability to the swelling of the buttocks is also different depending on the difference in the size of the sanitary napkin 1 .

In addition, the division of the regions of the waist portion 20 may be different from the divisions shown in FIG. 6 . For example, the area A in Fig. 6 is further distinguished, and the central part in the left-right direction is regarded as the area A1, and the two ends are regarded as the area A2. It is also possible to divide the welded part 60 in the areas A1 and A2 according to each size of the sanitary napkin 1. The configuration pattern of the is set differently. In this way, in the overlapping region R1 and the non-overlapping region R2 of the tampon 1, the area ratio of the welded portion 60 provided at the site where the fit is desired to be adjusted can be set more finely.

In addition, in the sanitary napkin 1 of this embodiment, it is desirable that the length of the absorbent body 10 in the longitudinal direction (vertical direction) of FIG. 2 is longer on the back side (rear side) than on the abdomen side (front side). That is, in the longitudinal direction, it is desirable that the length of the absorbent main body 10 in the rear side from the central position CL is longer than the length of the absorbent main body 10 in the front side from the central position CL. When the sanitary napkin 1 is worn, the wearer spends a long time in a sitting posture or a supine sleeping posture, and menstrual blood or the like tends to flow to the back side (rear side). Here, by moving the absorbent main body 10 to the back side (rear side) of the vertical central position CL, the area of the absorbent main body 10 on the back side becomes larger, and it is possible to easily suppress back leakage of menstrual blood and the like. .

Similarly, the length (effective length) of the stretchable portion of the absorbent elastic member 50 in the longitudinal direction (vertical direction) of FIG. 2 is preferably longer on the dorsal side (rear side) than on the ventral side (front side). That is, in the longitudinal direction, it is desirable that the effective length of the absorbent elastic member 50 on the rear side from the central position CL is longer than the effective length of the absorbent elastic member 50 on the front side from the central position CL. In the back region, since the groove of the wearer's buttocks extends longitudinally, it is necessary to improve the fit of the absorbent main body 10 on the buttocks side in order to suppress leakage of excrement. Therefore, by increasing the effective length of the absorbent elastic member 50 at the rear side, the range where the stretching force acts on the absorbent main body 10 is enlarged, so that the absorbent main body 10 and the wearer's skin (buttocks) can be completely attached. On the other hand, because the body shape of the wearer is flat compared with the back side in the abdomen area, even if the effective length of the absorbent elastic member 50 is shortened, the range where the contraction force acts is narrowed, excretion leakage, etc. are less likely to occur, and The user's abdomen can make it difficult for excessive tightening force to act.

===Others=== The above-mentioned embodiments are intended to facilitate the understanding of the present invention, and are not intended to limit the present invention for explainers. The present invention can be changed and improved without departing from the gist thereof, and it goes without saying that the present invention also includes equivalents thereof.

In the above-mentioned embodiment, an example of the underpants-type absorbent article was described for the underpants-type sanitary napkin 1, but the present invention is also applicable to other sanitary napkins other than the sanitary napkin. For example, the underpants-type absorbent article may be a pants-type (pants-type) disposable diaper for children or adults, a pants-type (pants-type) absorbent pad, or the like.

In the above-mentioned embodiment, although the skin-side sheets 22, 23 of the waist portion 20 are used as stretchable sheets (stretchable non-woven fabrics) to impart stretchability along the left-right direction to the waist portion 20, elastic members other than stretchable sheets may also be used. Elasticity is imparted to the waist portion 20 . For example, stretchability may be imparted to the waist portion 20 by providing a plurality of linear elastic members 26 such as thread rubber as follows.

9A and 9B are diagrams illustrating a method of attaching the linear elastic member 26 to the waist portion 20 using the welded portion pair 60 . When attaching the linear elastic member 26 using the welded part pair 60, a pair of welded parts 61, 62 adjacent in the vertical direction (longitudinal direction) is used as the welded part pair 60s, and the interval in the vertical direction of the welded parts 61, 62 is adjusted. It is arranged so that the linear elastic member 26 is sandwiched from both sides in the up-down direction by the welded portion pair 60s.

In the example of FIG. 9A, a pair of welded part 61,62 which becomes 60 s of welded part pairs is arrange|positioned at intervals GH60 in an up-down direction. The gap GH60 is set to be equal to or slightly larger than the diameter d26t of the linear elastic member 26 stretched to a predetermined elongation ratio (GH60≧d26t). That is, the linear elastic member 26 in the stretched state is arranged between the welded portion pair 60S in the vertical direction. Moreover, the space|interval of 60s and 60s of two welding part pairs adjacent to an up-down direction may be larger than GH60. That is, the welded portions 60 arranged in the patterns shown in FIG. 7B can only be arranged for a pair of welded portions 60, 60 (welded portion pair 60s) disposed at positions sandwiching the linear elastic member 26 up and down. Just adjust the interval GH60 in the up and down direction.

In this state, when the linear elastic member 26 is relaxed from the stretched state, as shown in FIG. 9B, the linear elastic member 26 expands in the vertical direction while shrinking in the left and right directions, and the diameter d26 in the natural state becomes smaller than that of the welded portion. The interval GH60 in the vertical direction to 60S is large (d26>GH60). That is, a state in which the linear elastic member 26 is pinched in the vertical direction is formed by the welded portions 61 and 62 . As a result, the linear elastic member 26 is attached to the waist portion 20 .

In this way, even when stretchability is imparted to the waist portion 20, as described above, for each size of the sanitary napkin 1, by changing the arrangement pattern of the welded portion 60 on the inside of the pair of side joint portions 20we, 20we in the left-right direction, 1. The shape of the gathers formed on the surface of the waist portion 20 allows the user to easily recognize from the appearance that the fit is different depending on the size.

1: Sanitary napkins (pants type sanitary napkins, absorbent articles) 1a: Waist opening 1b: Leg circumference opening 10: Absorbent body 11: Absorbent core 12: Top flakes 13: Second sheet 14: back sheet 15: side sheet 15t: end 20: Waistline 20f: ventral waist 20fe: end 20b: back waist 20be: end 20we: side joint 21: Non-skin side sheet 21c: Non-skin side convex part 22: Skin side sheet (stretchable sheet) 22c: Convex part of the skin 23: Skin side sheet (stretchable sheet) 23c: Convex part of the skin 25: waist elastic member 26: linear elastic member 30: leak-proof wall 31: Leakage wall elastic member 40: High density part 41: The first high-density department 42: The second high-density department 43: The 3rd High Density Department 50: Absorber elastic member 60: welding part 60s: weld pair 61: welding part 62: Welding part 100: package body 110: brand name 120: sub-brand name 130: Size symbol R1: overlapping region R2: non-overlapping regions CL: central position (halved line) WR1b: Width in the left-right direction of the high area ratio region on the back side WR1c: Width in the left and right directions of the high area ratio area WP1f: Width in the left-right direction of the high area ratio region in the ventral side A: area B: area C: area

[ FIG. 1 ] is a schematic perspective view of a sanitary napkin 1 . [ Fig. 2 ] It is a plan view of the sanitary napkin 1 in an unfolded and stretched state viewed from the skin side in the thickness direction. [ FIG. 3 ] is a schematic cross-sectional view of A-A in FIG. 2 . [ FIG. 4 ] is a plan view and a cross-sectional view of the absorbent main body 10 . [ Fig. 5 ] is a diagram showing an example of packaging when the sanitary napkin 1 is distributed in the market. [ FIG. 6 ] is a plan view showing the pattern arrangement of the welded portion 60 . [ FIG. 7 ] FIGS. 7A and 7B are diagrams illustrating three types of arrangement patterns of the welded portion 60 . [FIG. 8] It is a figure explaining the gathers formed in the surface of the waist part 20 of the sanitary napkin 1. [FIG. [ FIG. 9 ] FIGS. 9A and 9B are diagrams illustrating a method of attaching the linear elastic member 26 to the waist portion 20 using the welded portion pair 60 .

20: Waistline

20fe: end

25: waist elastic member

22: Skin side sheet (stretchable sheet)

CL: central position (halved line)

23: Skin side sheet (stretchable sheet)

20be: end

1b: Leg circumference opening

R1: overlapping region

WR1b: Width in the left-right direction of the high area ratio region on the back side

WR1c: Width in the left and right directions of the high area ratio area

WP1f: Width in the left-right direction of the high area ratio region in the ventral side

R2: non-overlapping regions

21: Non-skin side sheet

A: area

B: area

C: area

Claims (14)

An underpants-type sanitary napkin has a first size, has vertical and horizontal directions intersecting each other, and has: the absorbent body, and The waist part is formed by joining the abdominal side waist part and the back side waist part with each other by a pair of side joint parts at both ends in the left-right direction, The underwear-type sanitary napkin is characterized by: The waist portion has: a skin-side sheet, a non-skin-side sheet, and a plurality of welded portions joining the skin-side sheet and the non-skin-side sheet, and is stretchable in the left-right direction, In the plan view of the unfolded state, there is an overlapping region where the absorbent body and the waist portion overlap and a non-overlap area where the absorbent body and the waist portion do not overlap on the inner side of the pair of side joints in the left-right direction. area, In either of the overlapping region and the non-overlapping region, the total area of the welded portion provided per unit area has the same brand name and sub-brand name as the underwear-type sanitary napkin and has the second size The aforementioned area is different in other panty-type sanitary napkins. Such as request item 1 underwear type sanitary napkin, wherein, At least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet that can be stretched in the left-right direction, The total area of the welded parts provided per unit area in the end region overlapping with the left and right ends of the absorbent main body in the overlapping region is the same as that in the underpants-type hygienic part having the first size. Cotton is different from the aforementioned underpants type sanitary napkin having the aforementioned second size. Such as request item 2 underpants type sanitary napkin, wherein, In the end region, the total area of the welded portions provided per unit area becomes smaller as the size of the sanitary napkin increases. Such as request item 3 underpants type sanitary napkin, wherein, The aforementioned end region is provided on the rear side. Such as the underwear-type sanitary napkin in any one of the request items 2~4, wherein, In the end region, the total area of the welded parts provided per unit area is located at the same position as the end region in the vertical direction and inside the end region in the left-right direction, It is not more than the total area of the aforementioned welded portions provided per unit area. For example, underpants type sanitary napkin in any one of the request items 2~5, wherein, In the end region, the total area of the welded portions provided per unit area is at the same position as the end region in the vertical direction and outside the end region in the left-right direction. Not less than the total area of the aforementioned welded portions provided per unit area. For example, underpants type sanitary napkin in any one of the request items 1~6, wherein, A waist elastic member capable of stretching in the left-right direction is provided at the upper end of the waist portion, In the region where the waist elastic member is provided in the non-overlapping region, the total area of the welded portion provided per unit area is greater than that of the underpants-type sanitary napkin having the first size and the underpants-type sanitary napkin having the second size. Sanitary pads are different. Such as request item 7 underwear type sanitary napkin, wherein, In the aforementioned dorsal waistline, In the region where the waist elastic member is provided in the non-overlapping region, the total area of the welded portion provided per unit area is greater than that of the underpants-type sanitary napkin having the first size and the underpants-type sanitary napkin having the second size. Sanitary pads are different. For example, underpants type sanitary napkin in any one of the request items 1~8, wherein, The waist portion has a non-skin side sheet formed of a non-woven fabric, and a skin side sheet formed of a stretchable non-woven fabric that is laminated on the skin side of the non-skin side sheet. When shrinking, the non-skin side convex portion after the aforementioned non-skin side sheet is convexly deformed toward the non-skin side and the skin side convex portion after the aforementioned skin side sheet is convexly deformed toward the non-skin side are formed, The skin side of the non-skin-side convex portion has a portion in contact with the non-skin side of the skin-side convex portion. For example, any one of the request items 1~9 items of underwear-type sanitary napkins, wherein, The overlapping region has a high area ratio region in which the total area of the welded portions provided per unit area becomes higher than other regions, And there is a portion where the width in the left-right direction of the high-area ratio region on the back side is smaller than the width in the left-right direction of the high-area ratio region on the ventral side. Such as request item 10 underwear type sanitary napkin, wherein, There is a portion where the width in the left-right direction of the high-area ratio region is changed to be smaller than the width in the left-right direction of the high-area ratio region at the lower end in the up-down direction. For example, underpants-type sanitary napkins in any one of the request items 1 to 11, wherein, The waist portion has a portion formed of one sheet member in the thickness direction, and the plurality of welded portions are also provided in the portion formed of the one sheet member. For example, underpants type sanitary napkin in any one of the request items 1~12, wherein, The above-mentioned absorbent main body has an absorber elastic member that expands and contracts along the above-mentioned up-down direction, The ratio of the length of the stretchable portion due to the absorptive elastic member to the length from the upper end to the lower end of the underpants-type sanitary napkin in the above-mentioned up-down direction is the ratio between the above-mentioned underpants-type sanitary napkin having the first size and The aforementioned underpants type sanitary napkin having the aforementioned second size is different. An underpants-type sanitary napkin group, comprising: a first underpants-type sanitary napkin having a first size, and A second panty-type sanitary napkin with a second size The panty-type sanitary napkin group is characterized by: The first underpants-type sanitary napkin and the second underpants-type sanitary napkin have the same brand name and sub-brand name respectively, Each of the first underwear-type sanitary napkin and the second underwear-type sanitary napkin has vertical and horizontal directions intersecting each other, and having: an absorbent body; and The waist part is formed by joining the abdominal side waist part and the back side waist part with each other by a pair of side joint parts at both ends in the left-right direction, The waist portion has: a skin-side sheet, a non-skin-side sheet, and a plurality of welded portions joining the skin-side sheet and the non-skin-side sheet, and is stretchable in the left-right direction, In the plan view of the unfolded state, there is an overlapping region where the absorbent body and the waist portion overlap and a non-overlap area where the absorbent body and the waist portion do not overlap on the inner side of the pair of side joints in the left-right direction. area, In either of the overlapping region and the non-overlapping region, the total area of the welded portion provided per unit area is different between the first underpants type sanitary napkin and the second underpants type sanitary napkin.

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