JP7490607B2 - Absorbent articles - Google Patents

Description

The present invention relates to an absorbent article having an absorbent body. In particular, the present invention relates to an absorbent article that reduces skin troubles.

In the following description, disposable diapers are used as an example of an absorbent article, but this absorbent article is not limited to disposable diapers and also includes absorbent articles such as sanitary napkins.

People who wear tape-type or pants-type disposable diapers sometimes wear absorbent pads (also called "pad-type disposable diapers"; the same applies below) inside the diaper. The advantage of using such absorbent pads is that it is not necessary to change the diaper after urination, and it is sufficient to only change the absorbent pad.

Some absorbent articles such as pad-type disposable diapers use mesh sheets for the top sheet or second sheet, which is closer to the skin than the absorbent body. This mesh sheet prevents urine absorbed by the absorbent body from flowing back to the skin, making it difficult for the urine to come into contact with the wearer's skin.

However, even with products that use such mesh sheets, if the wearer is bedridden, urination often flows down to the buttocks, where it is absorbed by the absorbent material. As a result, the absorbent material gets caught between the wearer's buttocks and bedding (futon, etc.), and urine flows back from the absorbent material onto the skin, making the wearer prone to developing a rash.

In addition to the absorbent articles mentioned above, the following patent documents disclose absorbent articles having a sheet with openings.

The absorbent article disclosed in Patent Document 1 comprises an inlet material having a plurality of openings at least in the crotch region, the plurality of openings being formed from a plurality of slits extending in the lateral direction of the absorbent product. The openings are formed by spreading a continuous inlet material from the slits in the longitudinal direction of the absorbent product. The liquid inlet material in the lateral direction of the absorbent product has a central region and two edge regions, and the plurality of openings are arranged in the central region, whereby the central region of the inlet material having the plurality of openings has a lower degree of elasticity than the edge regions. According to the absorbent article having such a configuration, it is said that the edge region of the inlet material shrinks to form a bowl-like shape in the crotch region. It is also disclosed that since there are no openings in the edge region, the edge functions as a liquid edge barrier to reduce the risk of side leakage.

The absorbent article disclosed in Patent Document 2 has a number of slits formed in the top sheet, and an elastically stretchable member fixed in a stretched state non-parallel to the slits. The portion of the top sheet having the elastically stretchable member contracts as the elastically stretchable member contracts, widening the slits and opening them as through-holes. This configuration has the advantage that it can always remain open even if the top sheet flexes or contracts, and that the wrinkles maintained by the contraction of the elastically stretchable member provide a soft uneven feel (cushioning). Furthermore, the top sheet contracts as the elastically stretchable member contracts, forming wrinkles in a direction perpendicular to the direction of contraction, which has the secondary advantage of preventing liquid from spreading over the top sheet.

JP 2018-516707 A JP 2009-006002 A

The aforementioned Patent Documents 1 and 2 are not intended to allow urine absorbed in the absorbent body to flow back, and there is no disclosure of how to use a sheet with openings to prevent backflow.

In addition, providing the inlet material only in the crotch area, as in Patent Document 1, tends to complicate the manufacturing process and equipment.

Therefore, the main objective of the present invention is to provide an absorbent article that can reduce skin trouble caused by urine backflow.

The absorbent article that solves the above problems is as follows.
<First aspect>
An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
A stretch suppressing region that suppresses stretching of the elastic sheet is provided in the crotch area,
An absorbent article, characterized in that an elastic region is provided on the back side portion.

(Action and Effect)
In this embodiment, a stretch-suppressing region is provided in the crotch area where the stretch of the elastic sheet is suppressed (i.e., the elastic sheet does not stretch or barely stretches). By suppressing stretch, the size of the joining holes provided in the elastic sheet does not become smaller (or hardly becomes smaller), so excreted urine can quickly reach the absorbent and be absorbed. If it takes a long time for the excreted urine to reach the absorbent, the urine will accumulate on the skin side of the absorbent article and spread over a wide area, touching the wearer's skin and causing irritation over that wide area, but the configuration of this embodiment can prevent such problems from occurring.

In addition, even with an elastic sheet that has reduced stretching, the amount of urine absorbed by the absorbent that flows back to the skin side can be reduced compared to when no elastic sheet is provided. In other words, urine absorbed by the absorbent can only flow back through the connection holes provided in the elastic sheet, so a certain degree of backflow prevention effect can also be achieved.

On the other hand, in this embodiment, a stretchable region (a region where the stretchability of the elastic sheet is not suppressed) is provided in the back side. By shrinking the elastic sheet without suppressing its shrinkage, the size of the joining holes provided in the elastic sheet can be reduced, and as a result, the return of urine absorbed by the absorbent to the skin side can be more effectively reduced. In addition, the shrinkage of the elastic sheet in the stretchable region of the back side forms pleats in the first sheet layer, which reduces the contact area between the first sheet layer and the skin and allows air to easily pass through the gaps between the pleats, making the wearer more likely to feel comfortable wearing the garment. When the contact area between the first sheet layer and the skin is reduced, even if urine returns, the urine only comes into contact with the skin through the contact area between the first sheet layer and the skin, reducing the area where the urine comes into contact with the skin and reducing skin troubles.

This version, which has an anti-stretch area in the crotch area, is particularly excellent as a product for women whose urinary excretion openings are located in the crotch area.

<Second aspect>
An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
A stretch suppression region that suppresses stretching of the elastic sheet is provided in the abdominal portion,
An absorbent article, characterized in that an elastic region is provided on the back side portion.

(Action and Effect)
In this embodiment, the provision of the stretch-restricting region in the abdominal portion allows urine excreted in the abdominal portion to quickly reach the absorbent and be absorbed. Other effects are the same as those in the first embodiment, and will not be described here. This embodiment, in which the stretch-restricting region is provided in the abdominal portion, is particularly excellent as a product for men whose urine excretion hole is located in the abdominal portion.

<Third aspect>
An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
An elasticity suppressing region that suppresses the elasticity of the elastic sheet is provided in the abdominal portion and the crotch portion,
An absorbent article, characterized in that an elastic region is provided on the back side portion.

(Action and Effect)
In this embodiment, the provision of the stretch-restricted regions in the abdominal portion and the crotch portion allows urine excreted in the abdominal portion and the crotch portion to quickly reach the absorbent and be absorbed. Other effects are the same as those in the first embodiment, and will not be described here. This embodiment, in which the stretch-restricted regions are provided in the abdominal portion and the crotch portion, is excellent for both men whose urinary excretion hole is located in the abdominal portion and women whose urinary excretion hole is located in the crotch portion.

<Fourth aspect>
The absorbent article according to the first or third aspect, wherein a size of the joint in a widthwise central portion of the crotch portion is smaller than a size of the joint in a widthwise outer portion of the crotch portion.

(Action and Effect)
As described in the first and third aspects, since the stretch-restraining region is provided in the crotch area, urine excreted in the crotch area can be made to quickly reach the absorbent body.

However, providing an area that suppresses stretching causes the problem that urine absorbed in the absorbent body is more likely to flow back. In particular, the absorbent body in the widthwise center of the crotch area is the part that is most likely to absorb excreted urine, so it is particularly important to prevent urine from flowing back from this part.

In this embodiment, the size of the joint in the widthwise center of the crotch is smaller than the size of the joint in the widthwise outer parts of the crotch. This makes the size of the joint hole in the widthwise center of the crotch smaller than the size of the joint hole in the widthwise outer parts of the crotch, and as a result, the amount of backflow from the absorbent in the widthwise center of the crotch can be reduced.

<Fifth aspect>
The absorbent article according to the second or third aspect, wherein the size of the joint at the widthwise central portion of the abdominal portion is smaller than the size of the joint at the widthwise outer portions of the crotch portion.

(Action and Effect)
As described above, the provision of the stretch-suppressing region causes a problem in that urine absorbed in the absorbent body is likely to flow back. In particular, since the absorbent body in the widthwise center portion of the abdominal portion is most likely to absorb excreted urine, it is particularly important to prevent the urine from flowing back from this portion.

In this embodiment, the size of the joint in the widthwise center of the abdominal part is made smaller than the size of the joint in the widthwise outer parts of the abdominal part. By doing so, the size of the joint hole in the widthwise center of the abdominal part is made smaller than the size of the joint hole in the widthwise outer parts of the abdominal part, and as a result, the amount of backflow from the absorbent body in the widthwise center of the abdominal part can be reduced.

<Sixth aspect>
The absorbent article of any one of the first to fifth aspects, wherein the size of the joint at the widthwise central portion of the back side portion is larger than the size of the joint at the widthwise outer portion of the back side portion.

(Action and Effect)
The central part in the width direction of the back side part is a part through which more urine flows when the wearer urinates than the outer parts in the width direction of the back side part. If the absorption speed of this part is slow, the urine will come into contact with the wearer's skin and easily develop into skin troubles, so it is necessary for the urination to be quickly absorbed by the absorbent body.

Therefore, in this embodiment, the size of the joint in the widthwise center part of the back side part is made larger than the size of the joint in the widthwise outer part of the back side part. By adopting such a configuration, the through-hole formed in the elastic sheet in the widthwise center part of the back side part can also be made larger. As a result, urine can be quickly absorbed by the absorbent body without being retained in the widthwise center part of the back side part.

On the other hand, by making the size of the joints in the widthwise outer parts of the back part smaller than the size of the joints in the widthwise center part of the back part, the through holes in the widthwise outer parts of the back part can also be made smaller. As a result, the amount of urine that flows back in the widthwise outer parts of the back part can be reduced. Since urine that flows into the absorbent body from the widthwise center part of the back part spreads into the absorbent body in the widthwise outer parts of the back part, it is highly effective in preventing urine from flowing back from the absorbent body in the widthwise outer parts of the back part.

Although it is important to prevent urine from backflowing from the widthwise center of the back side, this area includes the intergluteal cleft (the cleft of the buttocks), and the area of direct contact between the wearer's skin and the diaper is small. Therefore, it is most important to prevent urine from backflowing from the widthwise outer parts of the back side where the wearer's skin comes into direct contact with the diaper, and preventing urine backflow in this area is highly effective in preventing skin problems (such as rough skin) caused by urine backflow.

In addition, by reducing the size of the joint at the widthwise outer portion of the back portion, the elastic sheet is more likely to shrink, and folds are more likely to form in the first sheet layer at the widthwise outer portion of the back portion, thereby reducing the contact area between the first sheet layer and the skin. In addition, air can easily pass through the gaps between the folds of the first sheet layer, making the wearer more likely to feel comfortable when wearing the garment. When the contact area between the first sheet layer and the skin is reduced, even if urine flows back, the urine only comes into contact with the skin via the contact area between the first sheet layer and the skin, reducing the area over which the urine comes into contact with the skin, which also reduces skin troubles.

<Seventh aspect>
The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the crotch portion of the absorbent body,
In the crotch area,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to the first aspect, wherein a stretchable region is provided in a portion of the elastic sheet that does not overlap with the slit.

(Action and Effect)
In this embodiment, a slit extending in the front-rear direction is provided in the widthwise center of the crotch part of the absorbent body, which allows excreted urine to be quickly diffused in the front-rear direction of the absorbent body.

In addition, in this embodiment, an anti-stretch area is provided in the portion of the elastic sheet that overlaps with the slit, and an elastic area is provided in the portion of the elastic sheet that does not overlap with the slit. Since almost no urine is held in the slit portion of the absorbent, the amount of urine that flows back from the slit portion is small. Therefore, an anti-stretch area is provided in the portion of the elastic sheet that overlaps with the slit, and priority is given to allowing urine to reach the absorbent quickly rather than preventing backflow. On the other hand, urine that enters the slit is absorbed by the absorbent around the slit. In this way, since a large amount of urine is held in the portion of the absorbent without the slit, an elastic area is provided in that portion to prevent urine from flowing back.

<Eighth aspect>
The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the abdominal side portion of the absorbent body,
In the ventral part,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to the second aspect, wherein a stretchable region is provided in a portion of the elastic sheet that does not overlap with the slit.

(Action and Effect)
In this embodiment, a slit extending in the front-rear direction is provided in the widthwise center portion of the ventral side of the absorbent body, which allows excreted urine to be quickly diffused in the front-rear direction of the absorbent body.

The effect of providing an anti-stretch area in the area that overlaps with the slits in the elastic sheet and providing an elastic area in the area that does not overlap with the slits in the elastic sheet is the same as in the seventh embodiment, so a description of it will be omitted here.

<Ninth aspect>
The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the abdominal side portion and the crotch portion of the absorbent body,
In the abdominal region and the groin region,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to the third aspect, wherein a stretchable region is provided in a portion of the elastic sheet that does not overlap with the slit.

(Action and Effect)
In this embodiment, slits extending in the front-rear direction are provided in the abdominal part and the widthwise central part of the crotch part of the absorbent body, so that excreted urine can be quickly diffused in the front-rear direction of the absorbent body.

The effect of providing an anti-stretch area in the area that overlaps with the slits in the elastic sheet and providing an elastic area in the area that does not overlap with the slits in the elastic sheet is the same as in the seventh embodiment, so a description of it will be omitted here.

<Tenth aspect>
In the crotch area,
The absorbent article according to any one of the first to third aspects, wherein the elastic sheet extends to the widthwise ends of the absorbent article.

(Action and Effect)
By extending the elastic sheet in the crotch area to the widthwise end of the absorbent article, the relevant portion (the widthwise end of the crotch area of the absorbent article; the same applies below) can be stretched by the elastic sheet. Rubber thread is often arranged along the front-to-rear direction at the widthwise end of the crotch area of the absorbent article, but by extending the elastic sheet to the relevant portion, such rubber thread can be omitted, making it easier to manufacture the absorbent article. In addition, stretching the relevant portion with the elastic sheet provides a better feel against the skin than stretching it with rubber thread, which can also reduce skin troubles.

As described above, the present invention provides an absorbent article that can reduce skin troubles caused by urine backflow.

1 is a plan view showing the inner side of an absorbent article (absorbent pad) according to the present invention in an expanded state, in which the shaded areas indicate fixed portions of a gathered sheet. FIG. 2 is a plan view showing only the main part of FIG. 1 . This is a cross-sectional view taken along the line YY in FIG. 2 is a cross-sectional view taken along the line XX in FIG. 1. FIG. 2 is a plan view of a main part of an absorbent pad having a stretch-restricted region on the ventral side and stretch regions on the crotch and dorsal sides. FIG. 2 is a plan view of a main part of an absorbent pad having a stretch-restricted region in the crotch area and stretch regions in the ventral and dorsal areas. FIG. 2 is a plan view of a main portion of an absorbent pad having stretch-restricted regions in the abdominal and crotch areas and a stretch region in the dorsal area. FIG. 8 is a plan view of a main part of a modified example of the embodiment of FIG. 7, in which the sizes of the joining holes in the widthwise center portion and the widthwise outer portions are different. FIG. 13 is a plan view of a main part of an embodiment in which a slit is provided in the crotch portion. FIG. 13 is a plan view of a main portion of an embodiment in which the widths of the first sheet layer, the elastic sheet, and the second sheet layer are increased. 1A is a plan view of the essential parts of the stretchable region, FIG. 1B is a cross-sectional view taken along the line DD of FIG. 1A, FIG. 1C is a cross-sectional view in the worn state, and FIG. 1A to 1C are plan views showing various shapes of sheet joints. FIG. 2 is a plan view of the stretchable region in the unfolded state. FIG. 2 is an enlarged plan view showing a main part of the stretchable region in the unfolded state. FIG. 2 is an enlarged plan view showing a main part of the stretchable region in a natural length state. 14A is a cross-sectional view taken along the line DD in FIG. 14, and FIG. 14B is a cross-sectional view in the natural length state. FIG. 2 is a plan view of the stretchable region in the unfolded state. FIG. 4 is an enlarged plan view showing a main part of the stretchable region in the unfolded state. FIG. 2 is an enlarged plan view showing a main part of the stretchable region in a natural length state. 1 is a cross-sectional view showing a schematic cross section of a main part of an exterior body that has been stretched to a certain extent. 1 is a cross-sectional view showing a schematic cross section of a main part of an exterior body that has been stretched to a certain extent. FIG. 13A is a trace of a plan view of a sheet joint formed in a first welding form, and FIG. 13B is a trace of a plan view of a sheet joint formed in a third welding form. 1A is a plan view of the essential parts of the stretch suppression region, FIG. 1B is a cross-sectional view taken along the line D-D of FIG. 1A, FIG. 1C is a cross-sectional view in the attached state, and FIG. FIG. 4 is a plan view of a main portion of the expansion/contraction suppression region. FIG. 1 is a schematic diagram of an ultrasonic sealing device.

Below, examples of absorbent articles are described in detail with reference to the attached drawings.

(groin, ventral, dorsal)
The term "crotch area" means the area that corresponds to the crotch of the body when in use, and depending on the product, it may be the range from the center or vicinity of the center in the front-to-back direction LD of the absorbent article to a specified part on the front side, or a specified range in the center in the front-to-back direction LD of the absorbent article. If there is a narrow waist part in the middle of the absorbent article in the front-to-back direction LD or in the middle of the absorbent body in the front-to-back direction LD, it means a specified range in the front-to-back direction with the narrowest part of either or both of the waist parts as the center in the front-to-back direction.

In the illustrated embodiment, there is a narrowed portion at the middle of the absorbent pad (absorbent article) 200 and at the middle of the absorbent body 23, and the range in the front-to-back direction LD where the narrowed portion of the absorbent pad 200 is at its minimum width almost overlaps with the range in the front-to-back direction LD where the narrowed portion of the absorbent body 23 is at its minimum width. In the illustrated embodiment, the overlapping range in the front-to-back direction LD where the narrowed portions are at their minimum width is defined as the crotch region C2.

However, the range of the crotch area C2 in the front-rear direction LD is not limited to the overlapping portion described above. For example, even if both the absorbent article 200 and the absorber 23 have a waisted portion, the range of the front-rear direction LD where the waisted portion of either one of them (any one) is at its minimum width may be defined as the crotch area C2.

The range of the crotch area C2 in the front-rear direction LD is not limited to the range in the front-rear direction LD where the narrowest part is at its narrowest. For example, the entire range of the entire narrowest part of the absorbent article 200 and/or absorber 23 in the front-rear direction LD may be defined as the crotch area C2.

In addition, if the absorbent article 200 and the absorbent body 23 do not have a waisted portion, the length in the front-to-rear direction LD of the absorbent article 200 may be arbitrarily divided into equal parts. Generally, since people have thick buttocks, the length in the front-to-rear direction LD of the back side portion B2 is designed to be longer than the length in the front-to-rear direction LD of the ventral side portion F2. As a result, the position of the crotch portion C2 tends to be closer to the ventral side. Therefore, when the ventral edge of the absorbent article 200 in the front-to-rear direction LD is 0% and the back side edge is 100%, it is preferable to set the crotch portion C2 in the range of 20 to 60%, and more preferably in the range of 30 to 50%.

The above-mentioned content that it is preferable to set the crotch portion C2 in the range of 20 to 60%, and more preferably in the range of 30 to 50%, can be similarly applied to the case where the absorbent article 200 or the absorbent body 23 has a constricted portion. When the range of the front-rear direction LD determined by the above percentage does not match the range of the front-rear direction LD of the constricted portion, it is preferable to determine the crotch portion C2 based on the constricted portion in principle. As shown in the illustrated embodiment, the constricted portion is usually formed for the purpose of fitting the crotch portion C2 of the absorbent article 200 to the leg circumference, but it cannot be said that there is no case where the constricted portion is formed for some other purpose. In that case, the constricted portion may be provided from a position more ventral or more dorsal than usual. In such a case, it is preferable to set the crotch portion C2 based on the range of the front-rear direction LD determined by the above percentage, rather than based on the constricted portion.

The "ventral part" refers to the part in front of the crotch area, and the "dorsal part" refers to the part behind the crotch area.

In addition, whether or not the stretchable region 60 and the stretch-suppressing region 61 are provided in the ventral portion F2, the crotch portion C2, and the back portion B2 is preferably determined by checking whether or not the stretchable region 60 and the stretch-suppressing region 61 are present in the portion that is clearly recognized as the ventral portion F2, the portion that is clearly recognized as the crotch portion C2, and the portion that is clearly recognized as the back portion B2, based on the range of the front-rear direction LD of the waist portion described above and the range of the front-rear direction LD defined in percentage. In the illustrated embodiment, the elastic sheet 30 is also placed in the portion where the absorbent body 23 is not present (i.e., the ventral end and back end of the absorbent article 200) to facilitate manufacturing, but when determining whether or not the stretchable region 60 and the stretch-suppressing region 61 are provided in the ventral portion F2, the crotch portion C2, and the back portion B2, it is preferable to determine whether or not the stretchable region 60 and the stretch-suppressing region 61 are present in the elastic sheet 30 in the portion where the absorbent body 23 is present.

(Joining Means)
The joining means for joining the components can be, for example, an adhesive, and can be applied by solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (transfer of hot melt adhesive using letterpress printing), or the fixed portion of the elastic member can be formed by applying the adhesive to the outer circumferential surface of the elastic member using a comb gun or SureWrap instead of or in addition to this. Hot melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, polyester/polyamide-based, and the like, but can be used without any particular limitation. The joining means for joining the components can also be material welding means such as heat sealing or ultrasonic sealing.

(Basic structure of pad-type disposable diapers)
1 to 4 show a pad 200 of a pad-type disposable diaper as an example of an absorbent article. The pad 200 of the pad-type disposable diaper has a crotch portion C2 and a ventral portion F2 and a back portion B2 extending on both the front and rear sides of the crotch portion C2. The dimensions of each portion can be appropriately determined. For example, the total length (length in the front-rear direction) L of the article can be about 350 to 700 mm, the total width W1 can be about 130 to 400 mm, and in this case, the length in the front-rear direction of the crotch portion C2 can be about 10 to 150 mm, the length in the front-rear direction of the ventral portion F2 can be about 50 to 350 mm, and the length in the front-rear direction of the back portion B2 can be about 50 to 350 mm. The width W3 of the crotch portion C2 can be 100 mm or more, particularly about 120 to 260 mm, for an adult.

The pad 200 of the pad-type disposable diaper has a basic structure including a first sheet layer 20A and a second sheet layer 20B, an elastic sheet 30 interposed between the first sheet layer 20A and the second sheet layer 20B, and an absorbent 23 provided on the back side of the second sheet layer 20B. In this specification, the sheet including the first sheet layer 20A, the second sheet layer 20B, and the elastic sheet 30 is referred to as a stretch sheet 34.

(Absorber)
The absorbent body 13 may be a known one, such as a pulp fiber stack, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, with a highly absorbent polymer mixed or fixed thereto as necessary. The absorbent body 13 may be wrapped in a wrapping sheet 26 having liquid permeability and liquid retention, such as crepe paper, as necessary, for the purpose of maintaining the shape and polymer retention.

The absorbent body 13 is shaped like an hourglass, with a narrower constricted portion in the crotch area than the front and rear sides. The dimensions of the constricted portion can be determined as appropriate, but the length of the constricted portion in the front-to-rear direction can be about 20-50% of the total length of the diaper, and the width of its narrowest portion can be about 40-60% of the total width of the absorbent body 13.

(Outer sheet)
An outer sheet 21 is provided on the back side of the absorbent body 23 so as to slightly protrude beyond the periphery of the absorbent body 23. As the outer sheet 21, in addition to a polyethylene film or the like, a sheet having moisture permeability without impairing water impermeability can also be used to prevent stuffiness. This water impermeable and moisture permeable sheet can be, for example, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction.

(Exterior sheet)
The outer surface of the outer sheet 21 is covered with an exterior sheet 27 made of nonwoven fabric, and this exterior sheet 27 protrudes outward from the peripheral edge of the outer sheet 21 with a predetermined protrusion width. Various types of nonwoven fabric can be used as the exterior sheet 27. As the material fiber constituting the nonwoven fabric, synthetic fibers such as olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, polyamide-based fibers, regenerated fibers such as rayon or cupra, and natural fibers such as cotton can be used. The exterior sheet 27 can also be omitted.

(Back seat)
The sheet located on the back side of the absorbent body 23 is called the back sheet 10, and this back sheet 10 includes the outer sheet 21 and the exterior sheet 27. In other words, the back sheet 10 is a generic concept that includes the outer sheet 21 and the exterior sheet 27. The back sheet 10 does not include the packaging sheet 26.

(End flap, side flap, three-dimensional gathers)
At both ends of the pad 200 of the pad type disposable diaper in the front-rear direction LD, the exterior sheet 27 and the first sheet layer 20A are bonded together, extending forward and backward beyond the front and rear ends of the absorbent 23, to form end flap portions EF where the absorbent 23 is not present. At both sides of the pad 200 of the pad type disposable diaper, the exterior sheet 27 extends outward beyond the side edges of the absorbent 23, and the outer portions 24x of the gather sheets 24s forming the three-dimensional gathers 24 in the width direction WD are bonded to the inner surface of the portion from the extension portion to the side portion of the first sheet layer 20A over the entire front-rear direction LD, forming side flap portions SF where the absorbent 23 is not present. These bonded portions can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing. When the exterior sheet 27 is not provided, the outer sheet 21 can be extended to the side flap portions SF instead of the exterior sheet 27 to form the outer surface side of the side flap portions SF.

The gathered sheet 24s can be made of a plastic sheet or meltblown nonwoven fabric, but in terms of feel on the skin, it is preferable to use nonwoven fabric that has been treated with a water-repellent agent such as silicone.

The central portion 24c of the gather sheet 24s in the width direction extends onto the top sheet 22, and at the end portion at the central portion in the width direction, an elongated elastic member 24G is fixed in a stretched state along the front-to-rear direction with a hot melt adhesive or the like. The elongated elastic member 24G can be made of commonly used materials such as styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, polyester, etc., formed in the shape of a thread, string, strip, etc.

In addition, the widthwise outer portions 24x of both gather sheets 24s are bonded and fixed to the inner surface of the article (in the illustrated embodiment, the inner surface (skin side) of the exterior sheet 27) over the entire front-rear direction, while the widthwise center portions 24c are bonded and fixed to the inner surface of the article (in the illustrated embodiment, the inner surface (skin side) of the first sheet layer 20A) at both ends in the front-rear direction, and are not fixed to the inner surface of the article (in the illustrated embodiment, the inner surface (skin side) of the first sheet layer 20A) between both ends in the front-rear direction. This non-fixed portion is a portion that becomes a leak prevention wall that stands elastically against the inner surface of the article (in the illustrated embodiment, the inner surface (skin side) of the first sheet layer 20A), and its standing base end 24b is located at the boundary between the widthwise outer fixed portion 24x of the gather sheet 24s and its inner portion 24c.

(First sheet layer, second sheet layer, elastic sheet)
The absorbent body 23 is provided on the skin side with a first sheet layer 20A, a second sheet layer 20B, and an elastic sheet 30 interposed between the layers 20A and 20B. As shown in FIG. 11 and other figures, the first sheet layer 20A and the second sheet layer 20B are joined at a number of spaced joints 40 through joint holes 31 that penetrate the elastic sheet 30 to form an elastic sheet stretch structure. Although not shown, a portion of the first sheet layer 20A and the second sheet layer 20B may be joined via the elastic sheet 30 at a number of spaced joints 40. The region having this elastic sheet stretch structure has a stretch region that is contracted in the width direction due to contraction of the elastic sheet 30 and is stretchable in the width direction (i.e., the stretch direction ED is the width direction WD of the diaper).

In the illustrated embodiment, the first sheet layer 20A, the second sheet layer 20B, and the elastic sheet 30 are arranged continuously from the dorsal side B2 end to the ventral side F2 end of the pad 200. In this manner, the first sheet layer 20A, the second sheet layer 20B, and the elastic sheet 30 are arranged continuously, which facilitates the manufacture of the pad 200. For example, if the first sheet layer 20A, the second sheet layer 20B, and the elastic sheet 30 are arranged only in the crotch area C2, alignment is difficult and defective products are likely to occur, but by arranging the first sheet layer 20A, the second sheet layer 20B, and the elastic sheet 30 continuously as in the illustrated embodiment, such defects are less likely to occur.

(Stretchable and non-stretchable areas)
The absorbent article 200 shown in FIG. 5 is provided with a stretch-suppressing region 61 in the ventral portion F2, and a stretch region 60 in the crotch portion C2 and the back portion B2. By adopting such a configuration, it is possible to obtain the same effect as the second embodiment described above. The absorbent article 200 shown in FIG. 6 is provided with a stretch-suppressing region 61 in the crotch portion C2, and a stretch region 60 in the ventral portion F2 and the back portion B2. By adopting such a configuration, it is possible to obtain the same effect as the first embodiment described above. The absorbent article 200 shown in FIG. 7 is provided with a stretch-suppressing region 61 in the ventral portion F2 and the crotch portion C2, and a stretch region 60 in the back portion B2. By adopting such a configuration, it is possible to obtain the same effect as the third embodiment described above.

In each embodiment of Figures 5 to 7, the entire surface of the stretch sheet 34 provided on the back portion B2 is the stretch region 60, but the entire surface of the stretch sheet 34 on the back portion B2 does not necessarily have to be the stretch region 60.

That is, the portion of the stretch sheet 34 arranged in the back portion B2 that does not overlap with the absorbent body 13 (for example, the back end in the front-to-rear direction LD) may be the stretch suppressing region 61. In addition, even in the portion of the stretch sheet 34 arranged in the back portion B2 that overlaps with the absorbent body 13, it is sufficient that most of it is the stretch region 60, and it is also acceptable for a portion to have the stretch suppressing region 61. Specifically, if the total area of the portion of the stretch sheet 34 arranged in the back portion B2 that overlaps with the absorbent body 13 is taken as 100%, it is preferable that 75% or more is the stretch region 60, and it is even more preferable that 90% or more is the stretch region 60.

Similarly, in the embodiment of FIG. 6, the entire surface of the stretch sheet 34 provided on the abdominal portion F2 is the stretch region 60, but the entire surface of the stretch sheet 34 on the abdominal portion F2 does not necessarily have to be the stretch region 60.

That is, the portion of the stretch sheet 34 arranged in the ventral portion F2 that does not overlap with the absorbent body 13 (for example, the ventral end in the front-to-rear direction LD) may be the stretch suppressing region 61. In addition, even in the portion of the stretch sheet 34 arranged in the ventral portion F2 that overlaps with the absorbent body 13, it is sufficient that most of it is the stretch region 60, and it is also acceptable for a portion to have the stretch suppressing region 61. Specifically, if the total area of the portion of the stretch sheet 34 arranged in the ventral portion F2 that overlaps with the absorbent body 13 is taken as 100%, it is preferable that 65% or more is the stretch region 60, and it is even more preferable that 80% or more is the stretch region 60.

Similarly, in the embodiment of FIG. 5, the entire surface of the stretch sheet 34 provided in the crotch area C2 is the stretch area 60, but the entire surface of the stretch sheet 34 in the crotch area C2 does not necessarily have to be the stretch area 60.

In other words, it is sufficient that the majority of the stretch sheet 34 placed in the crotch area C2 is the stretch region 60, and it is acceptable for a portion to have a stretch-suppressing region 61. Specifically, if the total area of the stretch sheet 34 placed in the crotch area C2 that overlaps with the absorbent body 13 is taken as 100%, it is preferable for 70% or more to be the stretch region 60, and it is even more preferable for 85% or more to be the stretch region 60.

The above also applies to the stretch suppression region 61. That is, in the embodiments of FIG. 5 and FIG. 7, the entire surface of the stretch sheet 34 provided on the abdominal portion F2 is the stretch suppression region 61, but the entire surface of the stretch sheet 34 on the abdominal portion F2 does not necessarily have to be the stretch suppression region 61.

That is, the portion of the stretch sheet 34 arranged in the ventral portion F2 that does not overlap with the absorbent body 13 (for example, the ventral end in the front-to-rear direction LD) may be the stretch region 60. In addition, even in the portion of the stretch sheet 34 arranged in the ventral portion F2 that overlaps with the absorbent body 13, it is sufficient that most of it is the stretch-suppressing region 61, and it is also acceptable for a portion to be the stretch region 60. Specifically, if the total area of the portion of the stretch sheet 34 arranged in the ventral portion F2 that overlaps with the absorbent body 13 is taken as 100%, it is preferable that 65% or more is the stretch-suppressing region 61, and it is even more preferable that 80% or more is the stretch-suppressing region 61.

Similarly, in the embodiments of Figures 6 and 7, the entire surface of the stretch sheet 34 provided in the crotch area C2 is the stretch suppression area 61, but the entire surface of the stretch sheet 34 in the crotch area C2 does not necessarily have to be the stretch suppression area 61.

In other words, it is sufficient that the majority of the stretch sheet 34 placed in the crotch area C2 is the stretch-suppressing area 61, and it is acceptable for a portion to be the stretch-suppressing area 60. Specifically, if the total area of the stretch sheet 34 placed in the crotch area C2 that overlaps with the absorbent body 13 is taken as 100%, it is preferable for 70% or more to be the stretch-suppressing area 61, and it is even more preferable for 85% or more to be the stretch-suppressing area 61.

(Detailed explanation of the stretch area)
The stretchable region 60 in each illustrated embodiment is mainly stretchable in the width direction WD. That is, in the stretchable region 60, the elastic sheet 30 is contracted in the width direction WD by the contraction force of the elastic sheet 30, and is also extensible in the width direction WD. More specifically, in a state where the elastic sheet 30 is stretched in the width direction WD, the first sheet layer 20A and the second sheet layer 20B are joined through the joining holes 31 of the elastic sheet 30 at intervals in the width direction WD and in the front-rear direction LD (direction LD perpendicular to the stretch direction) perpendicular thereto, and a large number of first joining portions 40 are formed to form an elastic sheet stretchable structure, and the elastic sheet 30 remains uninterrupted in the width direction WD in the stretchable region 60, and the first sheet layer 20A and the second sheet layer 20B are contracted by the contraction force of the elastic sheet 30 to form contraction folds 25, thereby imparting such stretchability.

In the stretchable region 60, the elastic sheet 30 may have a portion 32 that is linearly continuous along the width direction WD as in the example shown in FIG. 11, or may not have such a portion 32 as in the examples shown in FIG. 13 and FIG. 17.

As shown in Figures 11 and 16 (b), when the stretchable region 60 is in its natural length, the first sheet layer 20A and the second sheet layer 20B between the first joint 40 expand in a direction away from each other, forming contraction folds 25 extending in the front-to-back direction LD. Even when the stretchable region 60 is worn and stretched to a certain extent in the width direction WD, the contraction folds 25 are stretched but remain. Furthermore, as shown in the illustrated form, when the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except at least between the first sheet layer 20A and the second sheet layer 20B at the first joint 40, as can be seen from Figure 11(c), which illustrates the worn state, and Figure 11(a), which illustrates the unfolded state of the first sheet layer 20A and the second sheet layer 20B, in these states, the edges of the joint holes 31 in the elastic sheet 30 move away from the outer peripheral edge of the first joint 40 in the stretching direction, opening air holes 33 (gaps), and these air holes 33 add breathability even if the material of the elastic sheet 30 is a non-porous film or sheet. In particular, if the elastic sheet 30 has a linearly continuous portion 32 along the width direction WD, in the natural length state, the elastic sheet 30 further shrinks, narrowing the joint hole 31, resulting in a configuration in which almost no gap is formed between the joint hole 31 and the first joint portion 40, and if the elastic sheet 30 does not have a linearly continuous portion along the width direction WD, the ventilation hole 33 remains.

It is desirable that the maximum elongation of the stretchable region 60 in the width direction WD is 190% or more (preferably 200-220%). The maximum elongation of the stretchable region 60 is determined almost entirely by the elongation rate of the elastic sheet 30 during manufacturing, but it is reduced by factors that inhibit contraction in the width direction WD. The main such inhibiting factor is the ratio of the length L of the first joint 40 per unit length in the width direction WD, and the greater this ratio, the lower the maximum elongation. Normally, the length L of the first joint 40 is correlated with the area ratio of the first joint 40, so the maximum elongation of the stretchable region 60 can be adjusted by the area ratio of the first joint 40.

When the elastic sheet 30 has a linearly continuous portion 32 along the width direction WD as in the example shown in FIG. 11, the tensile stress of the stretchable region 60 can be adjusted mainly by the sum of the orthogonal dimensions 32w (equal to the spacing 31d between the joining holes) of the linearly continuous portion 32 (see FIG. 11(a)) of the elastic sheet 30 along the width direction WD. On the other hand, when the elastic sheet 30 does not have a linearly continuous portion along the width direction WD as in the examples shown in FIG. 13 and FIG. 17, the tensile stress of the stretchable region 60 can be adjusted by the crossing angle between the continuous direction of the non-jointed bands 51, 52, which are continuous portions without the first joint, and the stretch direction ED. In normal cases, it is preferable that the acute crossing angles θ1, θ2 between the continuous direction of the non-jointed bands 51, 52 and the stretch direction ED in the unfolded state are greater than 0 degrees and less than 45 degrees, and particularly in the range of 10 to 30 degrees.

The area ratio of the sheet joints 40 in the stretchable region 60 and the area of each sheet joint 40 can be determined as appropriate, but in general, it is preferable to set them within the following ranges.
Area of sheet joint 40: 0.14 to 3.5 mm ² (particularly 0.14 to 1.0 mm ² )
Area ratio of sheet joint 40: 1.8 to 19.1% (particularly 1.8 to 10.6%)
In this way, the maximum elongation and elongation stress of the stretchable region 60 can be adjusted by the area and area ratio of the sheet joint portion 40. Therefore, by providing multiple regions with different areas and area ratios of the sheet joint portion 40 within the stretchable region 60, it is possible to change the fit and urine permeability depending on the area.

For example, as shown in FIG. 8, in the stretchable region 60 provided in the back portion B2, the size of the joint 40 in the widthwise central portion 60A of the back portion B2 can be made larger than the size of the joint 40 in the widthwise outer portion 60B of the back portion B2. By adopting such a configuration, it is possible to obtain the effect of the sixth aspect described above.

Specifically, in the stretchable region 60 provided in the back portion B2, the area ratio of the joint 40 in the widthwise central portion 60A of the back portion B2 and the area of each joint 40 can be determined as appropriate, but in normal cases, it is preferable to set them within the following ranges.
Area of the joint 40 at the widthwise central portion 60A of the stretchable region 60 provided on the back side portion B2: 1.5 to 3.5 mm ² (more preferably 0.5 to 1.0 mm ² , and even more preferably 0.65 to 1.0 mm ² )
Area ratio of the joint 40 in the widthwise central portion 60A of the stretchable region 60 provided in the back portion B2: 10 to 19.1% (more preferably 5 to 19.1%, and even more preferably 8.5 to 19.1%)

In addition, in the stretchable region 60 provided in the back portion B2, the area ratio of the joints 40 in the widthwise outer portion 60B of the back portion B2 and the area of each joint 40 can be determined as appropriate, but in normal cases, it is preferable to set them within the following range.
Area of the joint 40 of the widthwise outer portion 60B of the stretchable region 60 provided on the back portion B2: 0.14 to 2 mm ² (more preferably 0.14 to 0.6 mm ² , and even more preferably 0.14 to 0.45 mm ² )
Area ratio of the joint 40 of the widthwise outer portion 60B of the stretchable region 60 provided on the back side portion B2: 1.8 to 12% (more preferably 1.8 to 8%, even more preferably 1.8 to 4.5%)

In addition, in the stretchable region 60 provided in the back portion B2, the average area of the multiple joints 40 provided in the widthwise central portion 60A of the back portion B2 is preferably at least 2.5 times, and more preferably at least 2 times, the average area of the multiple joints 40 provided in the widthwise outer portions 60B of the back portion B2.

The shape of each joint 40 and joint hole 31 in its natural length can be determined as appropriate, but it can be any shape, such as a perfect circle, ellipse, triangle, rectangle (see Figures 11, 13, and 17), a polygon such as a rhombus (see Figure 12(b)), a convex lens shape (see Figure 12(a)), a concave lens shape (see Figure 12(c)), a star shape, a cloud shape, etc. The dimensions of each first joint 40 are not particularly limited, but the maximum length 40y (approximately equal to the dimension 31y of the joint hole 31 in the orthogonal direction) is preferably 0.5 to 3.0 mm, especially 0.7 to 1.1 mm, and the maximum width 40x is preferably 0.1 to 3.0 mm, especially 0.1 to 1.1 mm when the shape is long in the direction XD perpendicular to the expansion and contraction direction.

The arrangement pattern of the joints 40 in the stretchable region 60 is not particularly limited, and any pattern (see, for example, Patent Documents 1 to 8) can be adopted, but it is particularly preferable that the non-jointed zones in which the parts without the joints 40 are continuous are present in a diagonal lattice pattern, as in the examples shown in Figures 11, 13, and 17. The illustrated examples show particularly preferable examples, in which the stretchable region 60, in the unfolded state, has a first non-jointed zone 51 that is linearly continuous along a first direction 51d that intersects with the stretchable direction ED at an acute angle (acute side crossing angle θ1) as the non-jointed zones 51, 52 in which the parts without the joints 40 are continuous, and are repeated at intervals in a direction perpendicular to the first direction 51d. In addition, a large number of joints 40 and joint holes 31 are provided at intervals between adjacent first non-jointed zones 51 in the stretchable region 60. Characteristically, unit structures including multiple first unbonded bands 51 with different first widths 51w, defined as the width in the direction perpendicular to the first direction 51d, are repeatedly present in the stretchable region 60 in the direction perpendicular to the first direction 51d.

In this way, when a unit structure including a plurality of first no-joint bands 51 with different first widths 51w is repeatedly present in a direction perpendicular to the first direction 51d in the stretchable region 60, a similar change in width is formed in the continuous portion of the elastic sheet 30 inside the first no-joint band 51. In other words, if the width 51w of the first no-joint band 51 is narrow, the width of the continuous portion of the elastic sheet 30 inside the first no-joint band 51 is also narrow, and if the width 51w of the first no-joint band 51 is wide, the width of the continuous portion of the elastic sheet 30 inside the first no-joint band 51 is also wide. If the first width 51w changes in the continuous portion of the elastic sheet 30 inside the first no-joint band 51, both the continuous portion of the elastic sheet 30 inside the wide first no-joint band 51 and the continuous portion of the elastic sheet 30 inside the narrow first no-joint band 51 are visually emphasized, and as a result, the stretchable region 60 has a beautiful appearance of diagonal stripes whether in its natural length state (see Figures 15 and 19) or in a state where it is stretched to a certain extent when worn. In other words, when the first unbonded zone 51 is in a state of contraction to a certain extent, the size of the contraction pleats 25 in the first unbonded zone 51 changes according to the first width 51w of the first unbonded zone 51, and the influence of the contraction pleats 25 makes the diagonal stripe pattern appear more clearly.

As long as the above-mentioned unit structure includes a plurality of first unbonded bands 51 with different first widths 51w, the size of the width 51w is not limited; however, it is preferable that the first width 51w of the first unbonded band 51 is 1.2 to 60 times larger and 0.01 to 0.8 times smaller than the first unbonded band 51 with the closest width 51w.

In addition, as long as the above-mentioned unit structure includes a plurality of first unbonded bands 51 with different first widths 51w, the first widths 51w of all the first unbonded bands 51 may be different, or the first widths 51w of some of the plurality of first unbonded bands 51 may be different from the first widths 51w of the other single or multiple first unbonded bands 51 as shown in the figure.

Even if a diagonal stripe pattern appears in the stretch region 60 along the first direction 51d due to the contraction pleats 25 of the first no-bond band 51 and the continuous part of the elastic sheet 30 therein, if a diagonal stripe pattern along another diagonal direction in the same stretch region 60 is more clearly visible, the diagonal stripe pattern due to the contraction pleats 25 of the first no-bond band 51 and the continuous part of the elastic sheet 30 therein may become less noticeable. On the other hand, if the maximum value of the first width 51w in the first no-bond band 51 is the maximum value of the width in the direction perpendicular to the continuous direction in all the no-bond bands 51, 52 having different and common inclination directions, the diagonal stripe pattern due to the contraction pleats 25 of the first no-bond band 51 and the continuous part of the elastic sheet 30 therein is more clearly visible in the stretch region 60, which is preferable. In this case, the maximum value of the first width 51w in the first no-bond zone 51 can be determined as appropriate, but it is preferably 1.2 to 60 times the width 51w of the first no-bond zone 51 with the closest width. The width of all no-bond zones 51, 52, including the first no-bond zone 51, in the direction perpendicular to the continuous direction is not limited, but it is usually preferably within the range of 0.02 to 5 mm. Needless to say, the width of the no-bond zones 51, 52 in the direction perpendicular to the continuous direction is the first width 51w in the first no-bond zone 51, and is of equal width because they are linearly continuous portions.

The first interval 51s, which is determined as the interval between adjacent first non-bonded bands 51 in a direction perpendicular to the first direction 51d, can be determined as appropriate. Therefore, this first interval 51s may be the same as the first width 51w between adjacent first non-bonded bands 51, or may be wider or narrower. One preferred example is a form in which the maximum value of the first width 51w in the first non-bonded band 51 in the unit structure is smaller than the maximum value of the first interval 51s. In this way, by forming a wide interval portion in the unit structure, the diagonal stripe pattern caused by the contraction pleats 25 of the first non-bonded band 51 and the continuous part of the elastic sheet 30 therein becomes more visible. In this case, the maximum value of the first width 51w in the first non-bonded band 51 can be determined as appropriate, but it is preferable that it is 0.01 to 9 times the maximum value of the first interval 51s. The spacing in the direction perpendicular to the continuous direction in all the bonded zones 51, 52, including the first bonded zone 51, is not particularly limited, but is usually preferably within the range of 0.3 to 50 mm. Needless to say, the spacing in the direction perpendicular to the continuous direction in the bonded zones 51, 52 is the first spacing 51s in the first bonded zone 51, and is equal to the continuous direction.

In the stretchable region 60, the second no-joint bands 51, 52 may be linearly continuous along the second direction 52d that intersects with the stretchable direction ED at an acute angle (acute side crossing angle θ2) other than the first direction 51d, and may be repeated at intervals in a direction perpendicular to the second direction 52d, or the second no-joint bands 52 may not exist. One preferred form having the second no-joint bands 52 is that the no-joint bands 51, 52 are formed in a diagonal lattice shape in the stretchable region 60, the first no-joint band 51 is a portion that continues in one direction in the diagonal lattice-shaped no-joint bands 51, 52, and the second no-joint band 52 is a portion that continues in the other direction in the diagonal lattice-shaped no-joint bands 51, 52. In this case, the first direction 51d and the second direction 52d have opposite positive and negative inclinations with respect to the stretchable direction ED. Even in configurations that do not have continuous unjointed bands 51, 52 in the width direction WD (stretch direction ED) as in the examples shown in Figures 13 and 17, the stretchability of the stretch region 60 can be sufficiently ensured by having the acute side crossing angles θ1, θ2 of the first direction 51d and the second direction 52d with respect to the stretch direction ED be 5 to 45 degrees, and particularly 10 to 30 degrees, when the stretch region 60 is in an unfolded state.

When the second no-bond zone 52 is included as in the example shown in FIG. 17, it is preferable that the second width 52w, which is determined as the width of the second no-bond zone 52 in the direction perpendicular to the second direction, is all the same, or that the first bonded portion 40 is arranged so as not to include the second no-bond zone 52. This makes the diagonal stripe pattern of the contraction pleats 25 of the first no-bond zone 51 and the continuous portion of the elastic sheet 30 therein more visible within the stretchable region 60.

On the other hand, between adjacent first unjointed bands 51, the first joints 40 are aligned in the first direction 51d. In this case, as shown in FIG. 18, for example, if all the first joints 40 have an acute cross angle θ3 in the longitudinal direction with respect to the direction perpendicular to the stretch direction ED of 10 degrees or less and a maximum dimension 40e in the stretch direction ED of 0.1 to 0.4 mm, this is preferable because it allows the dimension of the first unjointed bands 51 in the stretch direction ED to be larger and prevents a decrease in stretchability.

Furthermore, as in the example shown in Figure 13, when a unit structure includes a wide-width first unjointed band 51 having a maximum first width 51w and a narrow-width first unjointed band 51 having a narrower first width 51w, each adjacent to each other in a direction perpendicular to the first direction 51d, it is preferable that between adjacent wide-width first unjointed bands 51, first joint portions 40 having an acute crossing angle in the longitudinal direction with respect to the second direction 52d of within 5 degrees and a maximum dimension 40f in the direction perpendicular to the longitudinal direction of 0.1 to 0.4 mm are aligned at intervals in the first direction 51d. In addition, between adjacent narrow first unjoined bands 51, it is preferable that the first joints 40, which are elongated with an acute cross angle θ3 of 45 degrees or more in the longitudinal direction with respect to the first direction 51d and a maximum dimension 40g of 0.1 to 0.4 mm in the direction perpendicular to the longitudinal direction, are aligned at intervals in the first direction 51d. Due to the shape and arrangement of the first joints 40, the contraction pleats 25 of the first unjoined bands 51 and the continuous portion of the elastic sheet 30 therein are particularly visually emphasized with a smaller area of the first joints 40.

The row of joints 40 located between adjacent unjointed bands 51, 52 (the row in the continuous direction of the unjointed bands 51, 52) may be a single row or multiple rows. In addition, it is preferable that the spacing between the joints 40 in the row direction is regular, but it is not necessary for all the spacing to be uniform, and some of the spacing may be different.

(Detailed explanation of the stretch suppression area)
5 to 9, a stretch suppressing region 61 can be provided in a portion of the stretch sheet 34. As described above, the position of the stretch suppressing region 61 can be appropriately determined. The stretch suppressing region 61 has a maximum stretch in the stretch direction of 120% or less. The maximum stretch of the stretch suppressing region 61 is preferably 110% or less, and more preferably 100%.

The shape of each first joint 40 in the stretch suppression region 61 is not particularly limited and can be appropriately selected from shapes similar to those described in the stretch region 60 section.

The stretch-suppressing region 61 can be formed by densely arranging the joints 40 so that the first sheet layer 20A and the second sheet layer 20B do not shrink due to the contraction force of the elastic sheet 30 and form folds. Specific examples of the method of forming the stretch-suppressing region 61 include those described in Patent Documents 3 to 6. Figures 23 and 24 show an example of the stretch-suppressing region 61 described in Patent Document 6. In this stretch-suppressing region 61, the joint holes 31 are arranged in a staggered pattern at a certain degree of density, and although the elastic sheet 30 is continuous in the stretch direction ED, there is no linearly continuous portion along the stretch direction ED due to the presence of the joint holes 31. In this case, as shown in Figures 23 and 24, the ventilation holes 33 (gaps) are opened to a size that is almost the same in both the natural length state and the expanded state.

The area ratio of the joints 40 in the stretch suppression region 61 and the area of each of the joints 40 can be determined as appropriate. In general, the following ranges are preferable because the area of each joint 40 is small and the area ratio of the joints 40 is low, which prevents the stretch suppression region 61 from becoming hard.
Area of joint 40: 0.10 to 0.75 mm ² (particularly 0.10 to 0.35 mm ² )
Area ratio of the joint 40: 4 to 13% (particularly 5 to 10%)

As described above, the maximum elongation and elongation stress of the stretch-suppressing region 61 can be adjusted by the area and area ratio of the sheet joint 40. Therefore, by providing multiple regions with different areas and area ratios of the sheet joint 40 within the stretch region 60, it is possible to change the fit and urine permeability depending on the area.

For example, as shown in FIG. 8, the size of the joint 40 at the widthwise central portion 61A of the abdominal portion F2 and the crotch portion C2 can be made smaller than the size of the joint 40 at the widthwise outer portion 61B of the abdominal portion F2 and the crotch portion C2. By adopting such a configuration, it is possible to obtain the effects of the fourth and fifth aspects described above.

In the embodiment of FIG. 8, the stretch suppression region 61 is provided in both the abdominal portion F2 and the crotch portion C2, but when the stretch suppression region 61 is provided only in the abdominal portion F2 as in the embodiment of FIG. 5, the size of the joint 40 in the widthwise central portion 61A of the abdominal portion F2 may be made smaller than the size of the joint 40 in the widthwise outer portion 61B of the abdominal portion F2. By adopting such a configuration, it is possible to obtain the effect of the fourth aspect described above.

Furthermore, as in the embodiment of FIG. 6, when the stretch suppression region 61 is provided only in the crotch region C2, the size of the joint 40 in the widthwise central portion 61A of the crotch region C2 may be made smaller than the size of the joint 40 in the widthwise outer portion 61B of the crotch region C2. By adopting such a configuration, it is possible to obtain the effect of the fifth aspect described above.

As described above, in the stretch suppression region 61 provided in the abdominal portion F2 and/or the crotch portion C2, the area ratio of the joint 40 in the widthwise central portion 61A of the abdominal portion F2 and/or the crotch portion C2 and the area of each joint 40 can be determined as appropriate, but in normal cases, it is preferable to set it within the following range.
Area of the joint 40 in the widthwise central portion 61A of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2: 0.1 to 0.45 mm ² (more preferably 0.1 to 0.25 mm ² , and even more preferably 0.1 to 0.15 mm ² )
Area ratio of the joint 40 in the widthwise central portion 61A of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2: 4 to 9% (more preferably 5 to 8%, and even more preferably 5 to 6.5%)

In addition, in the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2, the area ratio of the joints 40 in the widthwise outer portion 61B of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2 and the area of each joint 40 can be determined as appropriate, but in normal cases, it is preferable to set them within the following ranges.
Area of the joint 40 of the widthwise outer portion 61B of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2: 0.4 to 0.75 mm ² (more preferably 0.2 to 0.35 mm ² , and even more preferably 0.3 to 0.35 mm ² )
Area ratio of the joint 40 in the widthwise outer portion 61B of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or the crotch portion C2: 8 to 13% (more preferably 7 to 10%, and even more preferably 8.5 to 10%)

In addition, in the stretch-suppressing region 61 provided in the abdominal portion F2 and/or crotch portion C2, the average area of the multiple joints 40 provided in the widthwise outer portion 61B of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or crotch portion C2 is preferably at least twice the average area of the multiple joints 40 provided in the widthwise central portion 61A of the stretch-suppressing region 61 provided in the abdominal portion F2 and/or crotch portion C2, and more preferably at least 1.5 times.

(slit)
9, when the absorbent 13 is provided in a region extending from the back portion B2 through the crotch portion C2 to the ventral portion F2, a slit 62 extending in the front-rear direction may be provided in the widthwise center portion of the crotch portion C2 of the absorbent 13. By providing this slit 62, urine discharged into the crotch portion C2 can be quickly diffused in the front-rear direction LD of the absorbent 13.

9, a stretch-suppressing region 61 that suppresses the stretch of the elastic sheet 30 may be provided in the crotch area C2 at a portion overlapping the slit 62 of the elastic sheet 30, and a stretch-suppressing region 60 may be provided at a portion not overlapping the slit 62 of the elastic sheet 30. The portion of the slit 62 provided in the absorber 30 has almost no absorption function (or no absorption function at all) because the absorber 30 is crushed by high pressure (or the absorber 30 may not be placed from the beginning), and almost no urine is retained. Therefore, the amount of urine that flows back from the portion where the slit 62 is provided is small. Therefore, it is preferable to provide the stretch-suppressing region 61 at the portion overlapping the slit 62 of the elastic sheet 30, and to prioritize the urine reaching the absorber 13 quickly rather than preventing backflow. On the other hand, the urine that has entered the slit 62 spreads in the width direction WD and the front-rear direction LD and is absorbed by the absorber 13 around the slit 62. Therefore, since the portion of the absorbent body 13 where the slits 62 are not present holds a large amount of urine, it is preferable to provide the stretchable region 60 in that portion to prevent urine from flowing back.

Because absorbent articles are manufactured at high speed, it is difficult to perfectly align the positions of the slits 62 and the stretch suppression regions 61. Therefore, as shown in FIG. 9, the stretch suppression regions 61 may be slightly larger than the slits 62, or conversely, slightly smaller than the slits 62. Specifically, in order to obtain the above-mentioned effect, when the area of the slits 62 is taken as 100%, the area of the stretch suppression regions 61 is preferably about 80 to 120%, and more preferably about 90 to 110%. In this case, when the area of the slits 62 is taken as 100%, the area of overlap between the slits 62 and the stretch suppression regions 61 is preferably 80 to 100%, and more preferably 90 to 100%.

The embodiment shown in FIG. 9 is suitable for women, whose urination outlet is in the crotch area C2. Although not shown, in the case of an absorbent article for men, since the urination outlet is in the ventral area F2, it is preferable to form the slit 62 in the ventral area F2. Also, in the case of an absorbent article for both men and women, it is preferable to form the slit 62 in both the ventral area F2 and the crotch area C2. In these cases, too, it is preferable to make the portion overlapping with the slit 62 the stretch-suppressing area 61, and it is preferable to make the portion not overlapping with the slit 62 the stretch area 60.

(Extension of elastic sheet in width direction)
10, the elastic sheet 30 may extend to the end of the absorbent article 200 in the width direction WD in the crotch region C2. By adopting such a configuration, it is possible to obtain the same effect as that of the tenth aspect described above.

(Joint structure of sheet joint)
When the first sheet layer 20A and the second sheet layer 20B at the sheet joint 40 are joined through a joint hole 31 formed in the elastic sheet 30, it is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30, at least except between the first sheet layer 20A and the second sheet layer 20B at the sheet joint 40.

The joining means for the first sheet layer 20A and the second sheet layer 20B at the sheet joining section 40 is not particularly limited. For example, the joining of the first sheet layer 20A and the second sheet layer 20B at the sheet joining section 40 may be performed using a hot melt adhesive, or may be performed using a joining means that involves material welding, such as heat sealing or ultrasonic sealing.

When the first sheet layer 20A and the second sheet layer 20B are joined through the joining holes 31 of the elastic sheet 30 at the sheet joining portion 40, the form in which the sheet joining portion 40 is formed by material welding may be any of the following: a first welding form (see FIG. 20(a)) in which the first sheet layer 20A and the second sheet layer 20B are joined only by a majority or a portion of the molten solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B at the sheet joining portion 40; a second welding form (see FIG. 20(b)) in which the first sheet layer 20A and the second sheet layer 20B are joined only by the entire or majority or a portion of the molten solidified material 30m of the elastic sheet 30 at the sheet joining portion 40; and a third welding form (see FIG. 20(c)) which is a combination of both of these, but the second and third welding forms are preferred.

Particularly preferred is a form in which the first sheet layer 20A and the second sheet layer 20B are joined by a part of the melted and solidified material 20m of the first sheet layer 20A and the second sheet layer 20B and the melted and solidified material 30m of all or most of the elastic sheet 30 at the sheet joining portion 40. In the third welding form shown in FIG. 22(b), the melted and solidified material 30m of the elastic sheet 30, which appears in white, can be seen between the melted and solidified material 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B, which appears in black, whereas in the first welding form shown in FIG. 22(a), the melted and solidified material of the elastic sheet 30 cannot be seen between the melted and solidified material 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B.

When the first sheet layer 20A and the second sheet layer 20B are joined using a molten solidified material 20m of most or a part of at least one of the first sheet layer 20A and the second sheet layer 20B as an adhesive, as in the first and third adhesive forms, it is preferable that a part of the first sheet layer 20A and the second sheet layer 20B is not melted, so that the sheet joint portion 40 does not harden.

When the first sheet layer 20A and the second sheet layer 20B are nonwoven fabrics, the fact that a portion of the first sheet layer 20A and the second sheet layer 20B does not melt includes a form in which the core (including not only the core of composite fibers but also the central portion of single-component fibers) of all fibers in the sheet joint 40 remains but the surrounding portion (including not only the sheath of composite fibers but also the surface layer portion of single-component fibers) melts, a form in which some fibers do not melt at all but the remaining fibers melt entirely, or a form in which the core remains but the surrounding portion melts.

As in the second and third welding forms, when the first sheet layer 20A and the second sheet layer 20B are bonded using the molten solidified material 30m of the elastic sheet 30 as an adhesive, the peel strength is high. In the second welding form, the elastic sheet 30 is sandwiched between the first sheet layer 20A and the second sheet layer 20B under conditions where the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30 and the heating temperature when the sheet joint 40 is formed, and the area that will become the sheet joint 40 is pressurized and heated to melt only the elastic sheet 30.

On the other hand, in the third welding form, the elastic sheet 30 is sandwiched between the first sheet layer 20A and the second sheet layer 20B under conditions where the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30, and the area that will become the sheet joint 40 is pressurized and heated to melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30.

From this perspective, the melting point of the elastic sheet 30 is preferably about 80 to 145°C, the melting points of the first sheet layer 20A and the second sheet layer 20B are preferably about 85 to 190°C, and particularly about 150 to 190°C, and the difference between the melting points of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic sheet 30 is preferably about 60 to 90°C. The heating temperature is preferably about 100 to 150°C.

In the second and third welding forms, when the first sheet layer 20A and the second sheet layer 20B are nonwoven fabrics, the molten solidified material 30m of the elastic sheet 30 may penetrate between the fibers throughout the entire thickness direction of the first sheet layer 20A and the second sheet layer 20B at the sheet joint 40 as shown in FIG. 21(c), but the flexibility of the sheet joint 40 is higher when it penetrates between the fibers up to the middle in the thickness direction as shown in FIG. 21(a), or when it barely penetrates between the fibers of the first sheet layer 20A and the second sheet layer 20B as shown in FIG. 21(b).

Figure 25 shows an example of an ultrasonic sealing device suitable for forming the second and third welding forms. In this ultrasonic sealing device, when forming the sheet joint 40, the first sheet layer 20A, the elastic sheet 30, and the second sheet layer 20B are fed between the anvil roll 60 having protrusions 60a formed on the outer surface in the pattern of the sheet joint 40 and the ultrasonic horn 61. At this time, for example, by making the feed transport speed of the upstream elastic sheet 30 by the feed drive roll 63 and the nip roll 62 slower than the transport speed after the anvil roll 60 and the ultrasonic horn 61, the elastic sheet 30 is stretched to a predetermined elongation rate in the MD direction (machine direction, flow direction) on the path from the nip position by the feed drive roll 63 and the nip roll 62 to the sealing position by the anvil roll 60 and the ultrasonic horn 61. The elongation rate of this elastic sheet 30 can be set by selecting the speed difference between the anvil roll 60 and the feed drive roll 63, and can be, for example, about 300% to 500%. 62 is a nip roll.

The first sheet layer 20A, the elastic sheet 30, and the second sheet layer 20B, which are fed between the anvil roll 60 and the ultrasonic horn 61, are heated by the ultrasonic vibration energy of the ultrasonic horn 61 while being pressed between the protrusions 60a and the ultrasonic horn 61 in this order, and either the elastic sheet 30 alone is melted, or at least one of the first sheet layer 20A and the second sheet layer 20B is melted with the elastic sheet 30, thereby forming a joining hole 31 in the elastic sheet 30 and simultaneously joining the first sheet layer 20A and the second sheet layer 20B through the joining hole 31. Therefore, in this case, the area ratio of the sheet joining portion 40 can be selected by selecting the size, shape, spacing, and arrangement pattern of the protrusions 60a of the anvil roll 60 in the roll length direction and roll circumferential direction of the roll.

The reason why the joining holes 31 are formed is not entirely clear, but it is believed that the holes are formed when the parts of the elastic sheet 30 that correspond to the protrusions 60a of the anvil roll 60 melt and break away from the surroundings. At this time, the parts of the elastic sheet 30 between the adjacent joining holes 31 aligned in the stretch direction ED are cut off from both sides of the stretch direction by the joining holes 31 as shown in Figures 11(a), 14, and 15, and lose support on both sides in the contraction direction. Therefore, within the range where continuity in the direction perpendicular to the contraction direction can be maintained, the part closer to the center in the direction LD perpendicular to the stretch direction ED shrinks until it is balanced with the center of the stretch direction, and the joining holes 31 expand in the stretch direction ED.

The first sheet layer 20A and the second sheet layer 20B may be made of any material, but preferably have air permeability. Therefore, from the above viewpoints and from the viewpoint of flexibility, it is preferable to use a nonwoven fabric. When using a nonwoven fabric, the basis weight is preferably about 10 to 25 g/ ^m2 . Also, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers formed by folding back a single material to face each other. For example, as shown in the figure, at the waist end 23, the material located on the outside is the second sheet layer 20B, and the folded back portion 20C formed by folding back the waist opening edge to the inner side is the first sheet layer 20A, with the elastic sheet 30 interposed therebetween, and at the other portions, the material located on the inside is the first sheet layer 20A, and the material located on the outside is the second sheet layer 20B, with the elastic sheet 30 interposed therebetween. Of course, it is also possible to provide the constituent materials of the first sheet layer 20A and the constituent materials of the second sheet layer 20B individually throughout the entire front-to-rear direction LD, and interpose the elastic sheet 30 between the constituent materials of the first sheet layer 20A and the constituent materials of the second sheet layer 20B without folding the constituent materials.

The elastic sheet 30 is not particularly limited, and may be an elastic film or a stretchable nonwoven fabric, as long as it is a sheet made of a thermoplastic resin that has elasticity in itself. In addition to a non-porous elastic sheet 30, one with a large number of holes or slits for ventilation may also be used. In particular, it is preferable for the elastic sheet 30 to have a tensile strength in the width direction WD (stretch direction ED, MD direction) of 8 to 25 N/35 mm, a tensile strength in the front-rear direction LD (direction XD, CD perpendicular to the stretch direction), a tensile elongation in the width direction WD of 450 to 1050%, and a tensile elongation in the front-rear direction LD of 450 to 1400%. The thickness of the elastic sheet 30 is not particularly limited, but is preferably about 20 to 40 μm.

(Top sheet)
Although not shown, the front side (skin side) of the first sheet layer 20A may be covered with a top sheet having liquid permeability. In this case, the absorbent 23 may partially protrude from the side edge of the top sheet, or the width of the top sheet may be widened so that the side edge of the absorbent 23 does not protrude. Various nonwoven fabrics can be used as the top sheet. The constituent fibers of the nonwoven fabric may be short fibers or long fibers (continuous fibers), and synthetic fibers such as olefins, polyesters, and amides such as polyethylene or polypropylene (which may be single-component fibers or composite fibers such as core-sheath structures made of multiple components), regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. In addition, the method of bonding the fibers of the nonwoven fabric is not particularly limited, and chemical means such as adhesives and solvents, or physical means such as mechanical entanglement and thermal bonding can be used. One of the nonwoven fabrics preferable for the top sheet is an air-through nonwoven fabric made by hot air bonding of thermoplastic synthetic fibers. The top sheet can be omitted.

(middle seat)
Although not shown, an intermediate sheet may be interposed between the second sheet layer 20B and the absorbent body 23. This intermediate sheet is provided to prevent the urine absorbed by the absorbent body 23 from flowing back, and is preferably made of a material with low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films. When the front end of the pad 200 is 0% and the rear end of the pad 200 is 100%, the front end of the intermediate sheet is preferably located in the range of 0 to 11%, and the rear end of the intermediate sheet is preferably located in the range of 92 to 100%. In addition, the width of the intermediate sheet is preferably about 50 to 100% of the minimum width W5 of the constricted portion 23n of the absorbent body 23. This intermediate sheet may also be omitted.

<Explanation of terms used in the specification>
As used herein, the following terms have the following meanings unless otherwise specified in the specification.

- "Front body" and "rear body" refer to the front and rear parts, respectively, of the pants-type disposable diaper, with the front-to-rear center as the boundary. Additionally, the crotch area refers to the front-to-rear range including the front-to-rear center of the pants-type disposable diaper, and if the absorbent body has a constricted portion, refers to the front-to-rear range of the part that has the constricted portion.

- The "front-rear direction" refers to the direction indicated by the symbol LD in the figure (longitudinal direction), and the "width direction" refers to the direction indicated by the symbol WD in the figure (left-right direction), with the front-rear direction and the width direction being perpendicular to each other.

- "MD direction" and "CD direction" refer to the flow direction (MD direction) in the manufacturing equipment and the horizontal direction (CD direction) perpendicular to it, and depending on the part of the product, one of them may be the front-to-back direction and the other the width direction. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation is the direction in which the fibers of the nonwoven fabric run, and can be determined, for example, by a measurement method based on the fiber orientation test method using zero-distance tensile strength in TAPPI standard method T481, or a simple measurement method that determines the fiber orientation direction from the tensile strength ratio in the front-to-back direction and the width direction.

- "Front side" means the side closest to the wearer's skin when worn, and "back side" means the side farthest from the wearer's skin when worn.

- "Front side" means the side of the component that is closest to the wearer's skin when worn, and "back side" means the side that is away from the wearer's skin when worn.

- "Maximum elongation" means the maximum elongation in the stretch direction ED (in other words, the elongation in an expanded state where the first and second sheet layers are expanded flat without contraction or slackness), and is expressed as a percentage of the natural length of the expanded state, which is 100%.

- "Area ratio" means the proportion of the target part in a unit area, and is expressed as a percentage by dividing the total area of the target parts (e.g., sheet joints 40, openings of joint holes 31, ventilation holes) in the target area (e.g., stretch area 80, non-stretch area 70) by the area of the target area, and "area ratio" in areas having a stretch structure in particular means the area ratio in the unfolded state. In configurations in which multiple target parts are spaced apart, it is desirable to set the target area to a size that includes 10 or more target parts and calculate the area ratio.

- "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

- "Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. Using a sample collection template (100mm x 100mm), cut out a sample measuring 100mm x 100mm from the test piece that has reached a constant weight. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter, which is the basis weight.

- The "thickness" of the absorbent is measured using a thickness gauge from Ozaki Seisakusho Co., Ltd. (Peacock, large dial thickness gauge, model J-B (measurement range 0-35 mm) or model K-4 (measurement range 0-50 mm)) with the sample and thickness gauge held horizontally.

"Thickness" other than the above is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .

- "Tensile strength" and "tensile elongation (elongation at break)" refer to values measured in accordance with JIS K7127:1999 "Plastics - Test method for tensile properties" with an initial chuck distance (distance between gauge marks) of 50 mm and a tensile speed of 300 mm/min, except that the test specimen is a rectangle of width 35 mm x length 80 mm. As a tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by Shimadzu Corporation can be used.

- "Elongation stress" means the tensile stress (N/35mm) measured when elongated within the elastic region in a tensile test with an initial chuck distance (gauge line distance) of 50 mm and a tensile speed of 300 mm/min according to JIS K7127:1999 "Plastics - Test method for tensile properties" and the degree of elongation can be appropriately determined depending on the test subject. The test piece is preferably rectangular with a width of 35 mm and a length of 80 mm or more, but if it is not possible to cut out a test piece with a width of 35 mm, a test piece with a width that can be cut out is prepared and the measured value is converted to a width of 35 mm. Even if the target area is small and sufficient test pieces cannot be taken, if the magnitude of the elongation stress is to be compared, it is at least possible to compare it with a test piece of the same size even if a test piece of an appropriately small size is used. As a tensile tester, for example, the AUTOGRAPH AGS-G100N manufactured by Shimadzu Corporation can be used.

- "Expanded state" means a flat, unfolded state without contraction or sagging.

- Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length.

- If there is no description of the environmental conditions for a test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (the test location shall be a temperature of 23±1°C and a relative humidity of 50±2%).

The present invention can be used for any type of disposable diaper, including pad-type disposable diapers as in the above example, tape-type disposable diapers, pants-type disposable diapers, etc. It can also be used for absorbent articles other than disposable diapers, such as sanitary napkins and disposable wearable articles for swimming and playing in water.

200...absorbent article (absorbent pad) (pad-type disposable diaper), 10...back sheet, 21...outer sheet, 23...absorbent body, 23n...absorbent body constriction portion, 24...three-dimensional gather, 24b...standing base end, 24c...gathered sheet widthwise center portion, 24G...elongated elastic member, 24s...gathered sheet, 24x...gathered sheet widthwise outer portion, 26...packaging sheet, 27...outer sheet, 30...elastic sheet, 31...joint hole, 33...ventilation hole, 34...stretchable sheet, 40...sheet joint portion, 51, 52...unjoined band, 51...first unjoined band, 51d...second One direction, 51s...first interval, 51w...first width, 52...second non-jointed zone, 52d...second direction, 60...stretch area, 61...stretch suppression area, 62...slit, B2...back side, C2...crotch area, F2...ventral side, L...total length of item, LD...front-back direction, TW...thickness direction, WD...width direction, W1...total width of item, W2...width of non-necked part, W3...width of crotch part, W5...minimum width of necked part, EF...end flap part, SF...side flap part

Claims (10)

An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
A stretch suppressing region that suppresses stretching of the elastic sheet is provided in the crotch area,
An absorbent article, characterized in that an elastic region is provided on the back side portion. An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
A stretch suppression region that suppresses stretching of the elastic sheet is provided in the abdominal side portion,
An absorbent article, characterized in that an elastic region is provided on the back side portion. An absorbent article having a crotch portion, a ventral portion extending in front of the crotch portion, and a dorsal portion extending in rear of the crotch portion,
a first sheet layer and a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer;
an absorbent body provided on the back side of the second sheet layer,
The first sheet layer and the second sheet layer are joined at a number of spaced apart joints through joint holes extending through the elastic sheet,
the first sheet layer, the second sheet layer and the elastic sheet are provided in a region extending from the back portion through the crotch portion to the abdominal portion,
An elasticity suppressing region that suppresses the elasticity of the elastic sheet is provided in the abdominal portion and the crotch portion,
An absorbent article, characterized in that an elastic region is provided on the back side portion. The absorbent article according to claim 1 or 3, wherein the size of the joint at the widthwise center of the crotch portion is smaller than the size of the joint at the widthwise outer portions of the crotch portion. The absorbent article according to claim 2 or 3, wherein the size of the joint at the widthwise center of the abdominal side portion is smaller than the size of the joint at the widthwise outer portion of the crotch portion. The absorbent article according to any one of claims 1 to 5, wherein the size of the joint at the widthwise center of the back side portion is larger than the size of the joint at the widthwise outer portion of the back side portion. The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the crotch portion of the absorbent body,
In the crotch area,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to claim 1 , wherein the elastic sheet has an elastic region in a portion not overlapping with the slit. The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the abdominal side portion of the absorbent body,
In the ventral part,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to claim 2 , wherein the elastic sheet has an elastic region in a portion not overlapping with the slit. The absorbent body is
Provided in a region extending from the dorsal portion through the crotch portion to the abdominal portion,
A slit extending in the front-rear direction is provided in a widthwise central portion of the abdominal side portion and the crotch portion of the absorbent body,
In the abdominal region and the groin region,
a stretch suppressing region that suppresses stretching of the elastic sheet is provided in a portion of the elastic sheet that overlaps with the slit,
The absorbent article according to claim 3 , wherein the elastic sheet has an elastic region in a portion not overlapping with the slit. In the crotch area,
The absorbent article according to any one of claims 1 to 3, wherein the elastic sheet extends to the ends of the absorbent article in the width direction.

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