JP2022149107A - absorbent article - Google Patents

Abstract

To provide an absorbent article excellent in shape stability and shape restoration property of a bulge part.SOLUTION: An absorbent article comprises: a stretchable sheet 51 which is included in both sides of a width direction WD of at least a crotch part C2, and can be elastically stretched in the width direction WD; an upper layer part 50 being provided on a front side relative to the stretchable sheet 51 and including an upper absorber 23A; and a lower layer part 52 being provided on a rear side of the stretchable sheet 51 and including a lower absorber 23B. The upper layer part 50 comprises: bulge parts 53 which are provided on both sides of at least the crotch part C2 in the width direction WD, and swollen to the front side. The stretchable sheet 51 has first parts overlapped to the bulge part 53, and a second part adjacent to both sides of the first parts in the width direction WD. The upper layer part 50 has: junction parts 50b jointed to the second part of the stretchable sheet 51; and a non-junction part 50a which is provided between the junction parts 50b and not jointed to the first parts of the stretchable sheet 51. The bulge parts 53 are configured so that the junction parts 50b are made come close to each other in the width direction WD by elastic shrinkage of the stretchable sheet 51.SELECTED DRAWING: Figure 15

Description

The present invention relates to absorbent articles including disposable diapers and sanitary napkins.

Prevention of side leakage is essential for many of this type of absorbent articles. As one means for preventing side leakage, it is known to deform the portion of the absorbent article having the absorbent body into a W-shaped or M-shaped cross section by providing a slit or the like extending in the front-rear direction in the absorbent body. (See Patent Documents 2 and 3). These are formed on both sides in the width direction of the surface of the article with protuberances in which a portion having an absorbent body protrudes. movement is promoted, thereby preventing side leakage.

However, in these conventional structures, although the absorber is likely to bend along the slits, it is not fixed in a bent shape, so there is room for improvement in terms of shape stability and shape restoration of the protuberances. was there.

JP 2016-187386 A JP 2018-68818 A JP 2014-193209 A JP 2016-140477 A JP 2016-189931 A JP 2016-189933 A JP 2017-064224 A

Accordingly, a main object of the present invention is to provide an absorbent article that is excellent in shape stability and shape restoration of raised portions.

The absorbent article that solves the above problems is as follows.
<First Aspect>
a stretchable sheet that is elastically stretchable in the width direction and that is built into at least both sides of the crotch in the width direction;
an upper layer portion located on the front side of the elastic sheet and including an upper absorbent body;
a lower layer portion located on the back side of the elastic sheet and including a lower absorbent body,
The upper layer portion has raised portions positioned at least on both sides in the width direction of the crotch portion and raised to the front side,
The stretchable sheet has a first portion that overlaps the raised portion and second portions adjacent to both sides in the width direction thereof,
The upper layer portion includes a joint portion formed by joining the second portion of the stretch sheet and a non-joint portion located between the joint portions and not joined to the first portion of the stretch sheet. has
The raised portion is a portion raised by pushing up the non-joined portion by bringing the joined portion closer to the width direction due to elastic contraction of the stretchable sheet.
An absorbent article characterized by:

(Effect)
In the present absorbent article, the protruding portion of the upper layer portion protrudes in an inverted V shape, and a dam formed by the protruding portion is formed on the surface of the absorbent article. Therefore, the protuberance prevents the excrement from moving in the lateral direction and promotes the movement in the front-rear direction, thereby preventing lateral leakage. In addition, the raised portion is a portion raised by pushing up an intermediate non-joined portion due to the elastic contraction of the elastically contracting the elastic sheet on both sides of the joint portion of the stretchable sheet. In addition, since it is supported by the lower layer including the lower absorbent core, it is excellent in shape stability and shape restoration, so that it follows the shape change of the body surface and fits well.

<Second Aspect>
The upper layer portion has a non-raised portion between the raised portions,
The stretchable sheet extends from the back side of one raised portion to the back side of the other raised portion through the back side of the non-raised portion, and has a non-stretchable region located on the back side of the non-raised portion, and the non-stretchable region. and elastic regions located on both sides in the width direction of
The stretchable region and the non-stretchable region have a liquid-permeable first sheet layer, a liquid-permeable second sheet layer, and an elastic film interposed therebetween, and the first sheet the layer and the second sheet layer are welded together at spaced sheet joints through joint holes passing through the elastic film;
The elastic region is contracted in the width direction due to the contraction of the elastic film, and is a region that can be stretched in the width direction with the expansion of the gap between the outer circumference of the sheet joint portion and the inner circumference of the joint hole. ,
In the non-stretchable region, the area ratio of the gap formed between the outer circumference of the sheet joint and the inner circumference of the joint hole in the state of natural length is 10 to 30%, and the width direction of the stretchable region The elastic limit elongation is a region of 130% or less,
The absorbent article of the first aspect.

(Effect)
The stretchable sheet is not particularly limited as long as it is elastically stretchable in the width direction. Also, the elastic sheet may be provided individually for each protuberance. However, in order to facilitate production and control liquid permeability, it is preferable to incorporate an elastic film as in this embodiment. That is, according to this aspect, even in the case where the non-raised portion is provided between the raised portions in the upper layer, a single stretchable sheet is provided with a non-stretchable region in the non-raised portion, and the portions located on both sides of the non-stretchable region are provided in the non-raised portion. can be easily manufactured by leaving as an elastic region. In addition, the gap between the inner circumference of the joint hole formed in the elastic film and the outer circumference of the sheet joint serves as a passage through which gas and liquid pass in the thickness direction. Then open smaller. That is, in the present absorbent article, as a whole, backflow from the lower absorbent body is less likely to occur, and particularly, backflow from the lower absorbent body is less likely to occur in the protuberances closer to the skin.

<Third Aspect>
In the middle of the non-stretchable region in the width direction, an inelastic film region continuous in the front-rear direction is provided with a line or a plurality of lines spaced apart in the width direction.
The absorbent article of the second aspect.

(Effect)
Like the stretch sheet of this aspect, it is preferable to have a non-elastic film region continuous in the front-rear direction in the middle of the width direction, because the liquid permeability of the non-stretch region increases.

<Fourth Aspect>
In the elastic region, joint rows in which the sheet joints are arranged in the front-rear direction and non-joint bands that do not have the sheet joints throughout the front-rear direction are alternately and repeatedly provided in the width direction.
The absorbent article of the second or third aspect.

(Effect)
As in this aspect, when the sheet joints are formed in a stripe pattern, large pleats and grooves that are linearly continuous in the front-rear direction are alternately and repeatedly formed in the width direction on the surface of the stretchable sheet. Also on the back side of the body, it is possible to suppress lateral movement of excrement and promote forward and backward movement of the excrement.

<Fifth Aspect>
At least the surface of the stretchable sheet opposite to the joint side of the raised portion is directly or indirectly joined to the surface of the lower absorbent body,
The absorbent article according to any one of the first to fourth aspects.

(Effect)
In the case of this aspect, since the raised portion and the lower absorbent core form a firm cylindrical portion, the shape stability and shape recovery properties of the raised portion are further improved.

<Sixth Aspect>
The raised portion has an easily bendable portion extending in the front-rear direction in the middle portion in the width direction,
The absorbent article according to any one of the first to fifth aspects.

(Effect)
In the case of this aspect, since the protruding portion protrudes so as to bend at the easily bendable portion, a protruding portion that is higher and has excellent shape stability is formed.

<Seventh Aspect>
The upper absorbent body consists only of pulp fiber aggregates or contains superabsorbent polymer particles in pulp fiber aggregates,
The fiber basis weight of the pulp fiber assembly is 65 to 140 g/m ² ,
The superabsorbent polymer particles have a basis weight of 0 to 200 g/m ² ,
The absorbent article according to any one of the first to sixth aspects.

(Effect)
In the case of this aspect, the upper absorbent body has excellent flexibility, so that not only does the protuberance easily protrude, but also the protuberance feels soft when it comes into contact with the skin.

As described above, according to the present invention, advantages such as excellent shape stability and shape restoration properties of the raised portion are brought about.

Fig. 2 is a plan view showing the inner surface side of the pad-type disposable diaper in an unfolded state; It is a top view which shows only an important part. FIG. 2 is a cross-sectional view taken along line YY of FIG. 1; FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1; (a) It is a top view which expands and shows the principal part of an unfolded state. FIG. 2 is a sectional view corresponding to the XX section of FIG. 1; (a) is a plan view of the main part of the elastic region, (b) is a cross-sectional view taken along line DD of (a), (c) is a cross-sectional view of the worn state, and (d) is a cross-sectional view of the natural length state. FIG. 3 shows (a) a tracing diagram of a microscopic photograph from the planar direction, (b) a tracing diagram of a high-magnification microscopic photograph from the planar direction, and (c) a tracing diagram of a high-magnification microscopic photograph from a perspective direction, of the elastic region of the sample. (a) is a plan view of the essential part of the non-stretchable region, (b) is a cross-sectional view taken along line DD of (a), (c) is a cross-sectional view of the worn state, and (d) is a cross-sectional view of the natural length state. FIG. 4 is a plan view of the main part of the non-stretchable region; FIG. 4 is a plan view showing an example of sheet joints and joint holes; FIG. 4 is a cross-sectional view schematically showing a cross-section of a principal part of an exterior body elongated to some extent; FIG. 4 is a plan view showing various examples of arrangement of sheet joints; It is a front view which shows an ultrasonic sealing device. FIG. 3 is a cross-sectional view schematically showing the state of the natural length of the pad-type disposable diaper. FIG. 3 is a cross-sectional view schematically showing the state of the natural length of the pad-type disposable diaper. (a) is a plan view of the main part of the elastic region, and (b) is a cross-sectional view in a state contracted to some extent (assuming a worn state). It is a top view which shows only an important part. FIG. 3 is a cross-sectional view schematically showing the state of the natural length of the pad-type disposable diaper. It is a top view which expands and shows the principal part of a non-stretchable area|region.

Hereinafter, examples of absorbent articles will be described in detail with reference to the accompanying drawings. In addition, the term "crotch part C2" means the part that corresponds to the crotch part of the body when used, and depending on the product, it extends from the center of the article in the front-rear direction LD or its vicinity to a predetermined part on the front side as shown in the figure. It may be a range, or it may be a predetermined range in the center of the article in the front-rear direction LD. When the article has a narrow constricted portion 23n in the middle of the front-rear direction LD or in the middle of the absorbent bodies 23A and 23B in the front-rear direction LD, the minimum width portion of either or both of the constricted portions 23n is the center of the front-rear direction LD. means a predetermined front-to-rear direction LD range. Also, the "front part F2 (abdominal part)" means the part on the front side of the crotch part C2, and the "back part B2 (back part)" means the part on the rear side of the crotch part C2.

Each constituent member adjacent to each other in the thickness direction is fixed or joined, if necessary, in the same manner as known diapers, except for the fixing or joining portions described below. A dotted pattern portion in the cross-sectional view indicates an adhesive such as a hot-melt adhesive as the fixing or joining means. The hot-melt adhesive can be applied by slot coating, continuous-line or dotted-line bead coating, spiral-shaped, Z-shaped, wavy-shaped spray coating, or pattern coating (transfer of hot-melt adhesive by letterpress method). can be applied by any method. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a fixing or joining means for joining each constituent member, a material welding means such as heat sealing or ultrasonic sealing can be used. In portions where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or bonding is performed with a hot-melt adhesive, intermittent pattern coating such as spiral, Z-shaped, and wavy patterns can be preferably used, and the range of coating width by one nozzle or more can be preferably used. In the case of coating, intermittent pattern coating such as spiral, Z-shape, wave-like, etc. can be performed with or without spacing in the width direction. As a joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

In addition, as the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, etc., can be selected without particular limitation, and these can also be mixed and used. In order to increase the softness of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including fibers made hydrophilic by a hydrophilic agent), they are hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). ). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure. Nonwoven fabrics are classified into nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (such as SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

1 to 4 show a pad-type disposable diaper 200 as an example of absorbent articles. This pad-type disposable diaper 200 has a crotch portion C2, and a front portion F2 and a rear portion B2 extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate. For example, the total length (length in the front-rear direction) L of the article can be about 350 to 700 mm, and the total width W1 can be about 130 to 400 mm (however, wider than the width of the absorbent surface of the diaper). In this case, the length of the crotch part C2 in the front-rear direction is about 10-150 mm, the length of the front part F2 in the front-rear direction is about 50-350 mm, and the length in the front-rear direction of the rear part B2 is about 50-350 mm. be able to. Further, the width W3 of the crotch portion C2 can be set to 150 mm or more, particularly about 200 to 260 mm, for adults.

This pad-type disposable diaper 200 has a basic structure including absorbent bodies 23A and 23B between a liquid-impermeable sheet 21 and a liquid-permeable top sheet 22. As shown in FIG.

A liquid-impermeable sheet 21 is provided on the back side of the absorbent bodies 23A and 23B so as to slightly protrude from the peripheral edges of the absorbent bodies 23A and 23B. As the liquid-impermeable sheet 21, in addition to a polyethylene film or the like, a moisture-permeable sheet can be used without impairing water impermeability from the viewpoint of preventing stuffiness. The water-impervious/moisture-permeable sheet is a microporous sheet obtained by, for example, forming a sheet by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching the sheet in a uniaxial or biaxial direction. can be used.

The outer surface of the liquid-impermeable sheet 21 is covered with an exterior sheet 27 made of non-woven fabric, and the exterior sheet 27 protrudes outside the periphery of the liquid-impermeable sheet 21 with a predetermined protrusion width. Various nonwoven fabrics can be used as the exterior sheet 27 . The exterior sheet 27 can also be omitted.

The front sides of the absorbent bodies 23A and 23B are covered with a liquid-permeable top sheet 22 . Although the absorbent bodies 23A and 23B partially protrude from the side edges of the top sheet 22 in the illustrated embodiment, the width of the top sheet 22 can be widened so that the side edges of the absorbent bodies 23A and 23B do not protrude. Various nonwoven fabrics can be used as the top sheet 22 . One of the preferred nonwoven fabrics for the top sheet 22 is an air-through nonwoven fabric formed by hot-air bonding thermoplastic synthetic fibers.

It is desirable to interpose an intermediate sheet 25 between the top sheet 22 and the absorbent bodies 23A, 23B. The intermediate sheet 25 is provided to prevent backflow of urine absorbed by the absorbent bodies 23A and 23B, and is made of a material with low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films. It is desirable to use When the front end of the top sheet 22 is 0% and the rear end of the top sheet 22 is 100%, the front end of the intermediate sheet 25 is preferably positioned in the range of 0 to 11%. It is preferably located in the range of 92-100%. Also, the width W4 of the intermediate sheet 25 is preferably about 50 to 100% of the total width W3 of the absorbent bodies 23A and 23B. The intermediate sheet 25 can also be omitted.

At both ends in the front-rear direction LD of the pad-type disposable diaper 200, the liquid-impermeable sheet 21, the exterior sheet 27, and the top sheet 22 are respectively extended forward and backward from the front-rear ends of the absorbent bodies 23A and 23B and bonded together. An end flap portion EF is formed without the absorbers 23A and 23B. On both sides of the pad-type disposable diaper 200, the liquid-impermeable sheet 21 and the exterior sheet 27 extend outside the side edges of the absorbent bodies 23A and 23B, respectively, and extend from these extensions to the sides of the top sheet 22. A part 24x on the outside in the width direction WD of the gather sheet 24s forming the three-dimensional gathers 24 is attached to the inner surface of the part 24 over the entire front-rear direction LD, forming a side flap part SF in which the absorbers 23A and 23B do not exist. is doing. These bonded portions are indicated by diagonal lines in FIG. 1 and can be formed by hot-melt adhesive, heat sealing, or ultrasonic sealing. When the exterior sheet 27 is not provided, the liquid impermeable sheet 21 can be extended to the side flap portion SF instead of the exterior sheet 27 to form the outer surface side of the side flap portion SF.

As the material of the gather sheet 24s, a plastic sheet or a meltblown nonwoven fabric can be used, but from the viewpoint of feeling on the skin, it is preferable to use a nonwoven fabric treated with silicone or the like for water repellency.

A portion 24c on the central side in the width direction of the gather sheet 24s extends above the top sheet 22, and at the end portion on the central side in the width direction, an elongated elastic member 24G is attached in a stretched state along the front-rear direction. It is fixed with a melt adhesive or the like. The elongated elastic member 24G may be made of thread-like, cord-like, belt-like, or the like styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, silicone, polyester, or the like. , commonly used materials can be used.

In addition, both gathered sheets 24s are bonded and fixed to the inner surface of the article (the surface of the top sheet 22 and the inner surface of the exterior sheet 27 in the illustrated embodiment) over the entire front-rear direction at the outer portions 24x in the width direction, and the portions at the central side in the width direction. 24c is attached and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) at both ends in the front-rear direction, and is fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) between both ends in the front-rear direction. do not have. As shown in FIG. 15, this non-fixed portion is a portion that acts as a leak prevention wall that elastically stands against the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment), and its starting point 24b is the gather sheet 24s. It is positioned at the boundary between the fixed portion 24x on the outside in the width direction and the portion 24c on the inside.

The pad-type disposable diaper 200 of this example has an upper absorbent body 23A located on the frontmost side and a lower absorbent body 23B provided on the back side as absorbent bodies for absorbing and retaining the liquid content of excrement. there is A representative example of the absorbers 23A and 23B is formed by accumulating absorbent materials such as pulp fibers and superabsorbent polymer particles. As an example, the upper absorbent body 23A and the lower absorbent body 23B are based on a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric. It can be formed by mixing, adhering, or the like. Both the upper absorbent body 23A and the lower absorbent body 23B are preferably a mixed mass of pulp fibers and superabsorbent polymer particles.

As the superabsorbent polymer particles contained in the upper absorbent body 23A and the lower absorbent body 23B, those used in this type of absorbent article can be used as they are. In normal cases, such as when using distributed superabsorbent polymer particles, sieving using a 500 μm standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), and dropping under this sieving sieve When the particles are sieved using a 180 μm standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), the percentage of particles remaining on a 500 μm standard sieve is 30% by weight or less, and 180 μm It is desirable that the percentage of particles remaining on the standard sieve is 60% by weight or more. When superabsorbent polymer particles with different particle size distributions are used for the upper absorbent body 23A and the lower absorbent body 23B, the particle size distribution of the superabsorbent polymer particles used for the upper absorbent body 23A should be 500 μm and 180 μm. When sieving using a sieve, the percentage of particles remaining on a standard sieve of 500 μm is 50% by weight or less, and the percentage of particles remaining on a standard sieve of 180 μm is 50% by weight or more. The particle size distribution of the superabsorbent polymer particles used for body 23B is such that when sieving using the above-mentioned 500 μm and 180 μm standard sieves, the percentage of particles remaining on the 500 μm standard sieve is 25% by weight or less, and 180 μm It is desirable that the percentage of particles remaining on the standard sieve is 70% by weight or more.

Although the superabsorbent polymer particles are not particularly limited, those having a water absorption rate of 20 to 50 seconds and a water absorption amount of 50 to 80 g/g can be suitably used. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used.

The upper absorbent body 23A is, if necessary, an upper wrapping sheet having liquid permeability and liquid retention properties, such as crepe paper, individually or integrally in the case of having a plurality of layers, in order to retain the shape and superabsorbent polymer particles. 26A can be wrapped to form an integral upper absorbent element. Similarly, the lower absorbent body 23B may be individually wrapped or integrally wrapped with a liquid-permeable and liquid-retaining lower wrapping sheet 26B such as crepe paper to form an integrated lower absorbent element. can be done. In the cross-sectional view, the outer peripheral lines of the absorbers 23A and 23B are represented as packaging sheets 26A and 26B, and the hatched portions inside them are represented as absorbers 23A and 23B. The packaging sheets 26A and 26B can be omitted when the absorber alone has shape retention properties. Examples of such absorbers 23A and 23B include those in which a superabsorbent polymer is fixed to a hydrophilic nonwoven fabric. The upper absorbent element and the lower absorbent element may have different configurations or may be the same.

As long as the upper absorbent core 23A and the lower absorbent core 23B are provided in the region including the crotch portion, the dimensions in the front-rear direction and the dimensions in the width direction can be appropriately determined. Normally, it is preferable that the upper absorbent core 23A and the lower absorbent core 23B extend from the front side portion F2 to the rear side portion B2. Although the upper absorbent body 23A may have the same dimensions as the lower absorbent body 23B, it is desirable that the overall length and width of the upper absorbent body 23A are shorter than those of the lower absorbent body 23B as shown in the illustrated embodiment. Normally, the total length of the upper absorbent core 23A can be about 60-90% of the total length of the lower absorbent core 23B, and the total width of the upper absorbent core 23A can be about 60-90% of the total width of the lower absorbent core 23B. be able to.

The shape of the upper absorbent body 23A and the lower absorbent body 23B can be appropriately determined, and each can be rectangular. It is preferable that a predetermined portion in the middle in the front-rear direction including C2 is formed as a narrow constricted portion 23n. The minimum width W5 of the constricted portion 23n is preferably about 50 to 65% of the width W3 of the non-constricted portions located before and after the constricted portion 23n. When the front end of the article is 0% and the rear end of the article is 100%, the front end of the constricted portion 23n is preferably positioned in the range of 10 to 25%, and the rear end of the constricted portion 23n is preferably positioned in the range of 40 to 65%. and the portion (minimum width portion) of the constricted portion 23n having the minimum width W5 is preferably located in the range of 25 to 30%.

Characteristically, as shown in FIG. 4 and the like, the present pad-type disposable diaper 200 includes stretchable sheets 51 elastically stretchable in the width direction WD, which are built in at least both sides of the crotch portion C2 in the width direction WD, and stretchable sheets. It has an upper layer portion 50 located on the front side of 51 and including an upper absorbent core 23A, and a lower layer portion 52 located on the back side of the elastic sheet 51 and including a lower absorbent core 23B. In the illustrated example, the upper layer portion 50 includes an upper absorbent body 23A, an upper wrapping sheet 26A, an intermediate sheet 25, a top sheet 22 and gather sheets 24s, and a lower layer portion 52 includes a lower absorbent body 23B, a lower wrapping sheet 26B, and liquid impermeability. A sheet 21 and an exterior sheet 27 are included. In addition, the upper layer portion 50 is positioned at least on both sides of the crotch portion C2 in the width direction WD and has raised portions 53 that protrude on the front side. and second portions adjacent to each side of the WD. Furthermore, the upper layer portion 50 includes a joint portion 50b formed by being joined to the second portion of the stretch sheet 51, and a non-joint portion located between the joint portions 50b and not joined to the first portion of the stretch sheet 51. and a portion 50a. The protuberance 53 is flat in the unfolded state shown in FIGS. 3 and 4, but in the natural length state and the attached state shown in FIG. As a result, the non-bonded portion 50a is pushed up and protruded to the front side.

In this way, the raised portion 53 of the upper layer portion 50 rises in an inverted V shape, and when a weir consisting of the raised portion 53 is formed on the surface of the diaper, the lateral movement of excrement is prevented by the raised portion. 53 dams up and promotes movement in the longitudinal direction LD, thereby preventing lateral leakage. Moreover, the protuberance 53 is a portion raised by pushing up the intermediate non-joint portion 50a by bringing the joint portions 50b on both sides of the stretchable sheet 51 closer to the width direction WD due to the elastic contraction of the stretchable sheet 51; Positioned above the lower layer part 52 and being supported by the lower layer part 52 including the lower absorbent body 23B, it has excellent shape stability and shape restoration property, so that it follows the shape change of the body surface and fits well. become a thing.

Although the raised portion 53 may have the upper absorbent body 23A only partially, from the viewpoint of shape retention, at least 90% (especially the entirety) of at least one of the width direction WD and the front-rear direction LD It is preferable to have the upper absorbent body 23A. The lower absorbent body 23B may be provided only in a part of the region overlapping with the raised portion 53, but from the viewpoint of the shape retention of the raised portion 53, the raised portion 23B may be formed in at least one of the width direction WD and the front-rear direction LD. It is preferably provided over 90% or more (especially the entire area) of the region overlapping with 53 .

The surface of the stretchable sheet 51 on the side opposite to the joint portion 50b side of the raised portion 53 may not be joined to the surface of the lower layer portion 52, but may be indirectly ( or directly), the raised portion 53 and the lower absorbent core 23B form a firm cylindrical portion, thereby further improving the shape stability and shape recovery of the raised portion 53.

It is preferable that the stretchable sheet 51 (and thus the raised portion 53 as well) extends from the front side portion F2 to the rear side portion B2 as in the example shown in FIGS. Although it is preferable to extend over the whole area, it may be partially provided such as only the crotch portion C2 as in the example shown in FIG. 18(a).

Although it is preferable to have a non-raised portion 54 between the raised portions 53 in the upper layer portion 50, the left and right raised portions 53 may be adjacent to each other. Even if the non-raised portion 54 is a portion 23m that does not have the upper absorbent body 23A (or upper absorbent element) as in the example shown in FIG. element) and lower absorbent body 23B, or a part having upper absorbent body 23A (or upper absorbent element) as in the example shown in FIG. The portion 23m without the upper absorbent body 23A (or upper absorbent element) is continuous over the entire front-rear direction LD of the upper absorbent body 23A (or upper absorbent element) as in the example shown in FIGS. 4 and 18(b). It may be a slit (that is, a pair of left and right upper absorbent bodies 23A (or upper absorbent elements) are arranged with a gap in the width direction WD), or an upper absorbent body as in the example shown in FIG. A slit that exists only in the middle of the body 23A (or the upper absorbent element) in the front-rear direction LD may also be used. In accordance with the arrangement of the slits or apart from the arrangement of the slits, the protuberances 53 may be provided over the entire front-rear direction LD of the upper absorbent body 23A (or upper absorbent element), or It may be provided only in the middle of the front-rear direction LD of the upper absorbent element).

The width 53x of the protuberance 53 is not particularly limited, but it is usually desirable to be about 5 to 20% of the minimum width W5 of the absorbent bodies 23A and 23B, specifically 7.5 to 30 mm for adult products. can be to some extent. The width 54x of the non-raised portions 54 (interval between the raised portions 53 in the width direction WD) can be determined as appropriate, but in normal cases it is desirable to be about 60 to 90% of the minimum width W5 of the absorbent bodies 23A and 23B. Specifically, in the case of products for adults, it can be about 90 to 135 mm. The elastic sheet 51 may be provided individually for each protuberance 53, but, for example, like the elastic sheet 51 described later, it extends from the back side of the protuberance 53 through the back side of the non-protuberance 54 to the other protuberance 53. It is also possible to provide a stretchable sheet 51 covering the back side, to provide a non-stretchable region 70 in a portion of the stretchable sheet 51 located between the protuberances 53, and to make stretchable regions 80 on both sides thereof.

As shown in FIG. 19, if the raised portion 53 has an easily bendable portion 53B extending in the front-rear direction LD in the middle portion in the width direction WD, the raised portion 53 is raised so as to be bent at the easily bendable portion 53B. , and the raised portion 53 having excellent shape stability is formed. The easily bendable portion 53B is formed by compressing (embossing, etc.) the upper layer portion 50, the upper absorbent body 23A, or the upper absorbent element in the thickness direction, in addition to slits provided in the upper absorbent body 23A as shown in the illustrated example. It is also possible to form a concave portion or a low weight portion in which the weight of the upper absorbent core 23A is small. On the other hand, it is also preferable from the standpoint of texture that the protruding portion 53 is not provided with the easily bendable portion 53B and is protruded in an arc shape.

In addition, when the upper absorbent body 23A is composed only of a pulp fiber assembly or contains superabsorbent polymer particles in the pulp fiber assembly, the fiber basis weight of the pulp fiber assembly is 65 to 140 g/m ² and high It is also preferred that the weight of the absorbent polymer particles is 0 to 200 g/m ² . Since the upper absorbent body 23A is excellent in flexibility, not only does the protuberance 53 easily protrude, but the feeling of the protuberance 53 coming into contact with the skin is soft.

The stretchable sheet 51 is not particularly limited as long as it is elastically stretchable in the width direction WD. It may be an elastic film 30 or a stretchable nonwoven fabric made of elastic fibers. Alternatively, the elastic sheet 51 may be provided only in the portion overlapping the raised portion 53 . The elastic sheet 51 preferably has liquid permeability, but a sheet with low liquid permeability or liquid impermeability can also be used.

The stretchable sheet 51 has a liquid-permeable first sheet layer 20A, a liquid-permeable second sheet layer 20B, and an elastic film 30 interposed therebetween, as shown in FIG. Alternatively, the first sheet layer 20A and the second sheet layer 20B may be welded through a joint hole 31 passing through the elastic film 30 at the sheet joints 40 arranged at intervals.

The shape of the individual sheet joints 40 in the natural length state can be determined as appropriate, but may be a perfect circle (see FIG. 11(e)), an ellipse, a triangle, a rectangle (see FIGS. 7 and 9), or a rhombus (see FIGS. 11(b)), convex lens shape (see FIG. 11(a)), concave lens shape (see FIG. 11(c)), star shape, cloud shape and the like. The dimensions of the individual sheet joints 40 are not particularly limited, but the maximum length 40y in the direction orthogonal to the stretching direction ED (width direction WD) is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. The maximum length 40x in the stretching direction ED is preferably 0.1 to 3.0 mm, especially in the case of a shape elongated in the direction perpendicular to the stretching direction ED, preferably 0.1 to 1.1 mm.

The size of the individual sheet joints 40 may be appropriately determined, but if it is too large, the hardness of the sheet joints 40 will have a large effect on the feel, and if it is too small, the joint area will be small and the materials will be sufficiently bonded together. Therefore, in normal cases, it is preferable that the area of each sheet joint portion 40 is about 0.14 to 3.5 mm ² . The area of the opening of each joint hole 31 should be equal to or larger than the sheet joint portion 40 because the sheet joint portion 40 is formed through the joint hole 31, but is 1 to 1.5 times the area of the sheet joint portion 40. It is preferable to set it to a degree. Note that the area of the opening of the joint hole 31 means a value in a state in which the elastic film 30 is integrated with the first sheet layer 20A and the second sheet layer 20B, and in a state of natural length, not in a state of the elastic film 30 alone. When the area of the opening of the elastic film 30 is not uniform in the thickness direction, for example, the front and back of the elastic film 30 are different, it means the minimum value. Reference numeral 40e in the drawing indicates the center interval of the sheet joint portions 40 in the orthogonal direction XD, and reference numeral 40f indicates the center interval of the sheet joint portions 40 in the expansion/contraction direction ED. In addition, reference numeral 31y in the drawing indicates the maximum length of the joint hole 31 in the direction XD perpendicular to the expansion/contraction direction ED, reference numeral 31x indicates the maximum length of the connection hole 31 in the expansion/contraction direction ED, and reference numeral 31e indicates the orthogonal direction. The center spacing of the joining holes 31 in XD is shown, and the reference numeral 31f represents the center spacing of the joining holes 31 in the expansion/contraction direction ED.

The planar arrangement of the sheet joints 40 and the joint holes 31 can be determined as appropriate, but a regularly repeated planar arrangement is preferable, and the arrangement may be an orthorhombic lattice as shown in FIG. Hexagonal lattices as shown (these are also called staggered lattices), square lattices as shown in FIG. 13(c), rectangular lattices as shown in FIG. Parallel lattice (as shown in the figure, a form in which two groups of many parallel oblique rows are provided so as to intersect with each other) shape (these are inclined at an angle of less than 90 degrees with respect to the stretching direction ), and the group of sheet joints 40 (the arrangement of the group units may be regular or irregular, and may be patterned, letter-shaped, etc.) is regularly repeated. You can also

The first sheet layer 20</b>A and the second sheet layer 20</b>B are joined at the sheet joining portion 40 through joining holes 31 formed in the elastic film 30 . In this case, it is desirable that the elastic film 30 is not joined at least between the first sheet layer 20A and the second sheet layer 20B at the sheet joining portion 40 .

Although the means for joining the first sheet layer 20A and the second sheet layer 20B at the sheet joining portion 40 is not particularly limited, from the viewpoint of ease of manufacture, the first sheet layer 20A and the second sheet layer 20B at the sheet joining portion 40 may be Bonding is preferably performed by a bonding means such as heat sealing or ultrasonic sealing, rather than using a hot-melt adhesive.

When the sheet joint portion 40 is formed by material welding, even if both the first sheet layer 20A and the second sheet layer 20B are melted and solidified at the sheet joint portion 40, the first sheet layer 20A and the second sheet layer 20B are not melted at the sheet joint portion 40. Only one of the second sheet layers 20B may be melted and solidified. Furthermore, the melt-solidified material of the elastic film 30 may be sandwiched between the sheet joints 40 .

Even if the first sheet layer 20A and the second sheet layer 20B are uniformly melted and solidified throughout the sheet joint portion 40 in the thickness direction and the planar direction as in the example shown in FIG. ) It may be melted and solidified non-uniformly, as shown by the dot pattern gradation in (c). For example, the degree of melting of the first sheet layer 20A and the second sheet layer 20B may be lower toward the outside in the thickness direction of the sheet joint portion 40, as in the example shown in FIG. 12(b). This state includes a state in which almost all the fibers of the first sheet layer 20A and the second sheet layer 20B are not melted on the surface of the sheet joint portion 40, A state in which the melted solidified material of the sheet layer 20B and unmelted fibers are mixed, and the fibers of the first sheet layer 20A and the second sheet layer 20B are melted over the entire thickness direction of the sheet joint portion 40, but are not melted. Conditions of varying degrees are included.

The first sheet layer 20A and the second sheet layer 20B are formed at the sheet joint portion 40 as in the example shown in FIG. The degree of melting may be lower toward the peripheral edge. In this state, almost all the fibers of the first sheet layer 20A and the second sheet layer 20B are not melted at the peripheral edge of the sheet joint portion 40 (however, the melted and solidified material of the elastic film 30 described later is an adhesive). ), a state in which melted and solidified materials of the first sheet layer 20A and the second sheet layer 20B and unmelted fibers are mixed in the peripheral edge portion of the sheet joint portion 40, and the plane of the sheet joint portion 40 It includes a state in which the fibers of the first sheet layer 20A and the second sheet layer 20B are melted over the entire direction, but the degree of melting varies.

In these states, when the fibers of the first sheet layer 20A and the second sheet layer 20B melt, the entire fiber melts, and the core of the fiber (not only the core of the composite fiber but also the monocomponent fiber (including the central portion of the fiber) remains but its surrounding portion (including not only the sheath in the composite fiber but also the surface side portion of the monocomponent fiber) is melted.

In addition, in a state in which the melted and solidified material of the elastic film 30 remains in the sheet joint portion 40, these a state in which the first sheet layer 20A and the second sheet layer 20B are melted and solidified, and a state in which the first sheet layer 20A and the second sheet layer 20B are not melted and solidified. or between the remaining fibers (including the core) of the first sheet layer 20A and the second sheet layer 20B which melt and solidify.

The melt-solidified material of the elastic film 30 remains in the sheet joint portion 40 under the condition that 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 film 30. The elastic film 30 is sandwiched between the sheet layer 20A and the second sheet layer 20B, and pressure and heat are applied to the portion to be the sheet joint portion 40 to bond at least one of the first sheet layer 20A and the second sheet layer 20B to the elastic film 30. can be produced by melting

FIG. 14 shows an example of a suitable ultrasonic sealing device. In this ultrasonic sealing device, when forming the sheet joint portion 40, between the anvil roll 60 having projections 60a formed on the outer surface in the pattern of the sheet joint portion 40 and the ultrasonic horn 61, the first sheet layer 20A, The elastic film 30 and the second sheet layer 20B are fed. At this time, for example, by making the feed transfer speed of the upstream elastic film 30 by the feed drive roll 63 and the nip roll 62 slower than the transfer speed after the anvil roll 60 and the ultrasonic horn 61, the feed drive roll 63 and the nip roll 62 The elastic film 30 is stretched to a predetermined elongation rate in the MD direction (machine direction, machine direction) along the path from the nip position by the anvil roll 60 and the ultrasonic horn 61 to the seal position by the ultrasonic horn 61 . The elongation rate of the elastic film 30 can be set by selecting the speed difference between the anvil roll 60 and the feeding drive roll 63, and can be set to about 300% to 500%, for example.

The first sheet layer 20A, the elastic film 30 and the second sheet layer 20B sent between the anvil roll 60 and the ultrasonic horn 61 are laminated in this order, and the protrusion 60a and the ultrasonic horn 61 While being pressurized between them, they are heated by the ultrasonic vibration energy of the ultrasonic horn 61 to melt only the elastic film 30, or to melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic film 30. By doing so, the joint holes 31 are formed in the elastic film 30 and at the same time, the first sheet layer 20A and the second sheet layer 20B are joined through the joint holes 31 . Therefore, in this case, the area ratio of the sheet joint portion 40 can be selected by selecting the size, shape, spacing of the protrusions 60a of the anvil roll 60, the arrangement pattern in the roll length direction and the roll circumferential direction, and the like. can be done.

In addition, at the time of joining, the portions of the first sheet layer 20A and the second sheet layer 20B corresponding to the projections 60a of the anvil roll 60 remain connected to the periphery (do not separate from the periphery), and the anvil roll 60 of the elastic film 30 is The joint hole 31 is opened by melting the portion corresponding to the protrusion 60a and separating from the surroundings. At this time, a portion of the elastic film 30 between adjacent joint holes 31 arranged in the stretching direction ED is formed by the joint holes 31 as shown in FIGS. Since it is cut from both sides of the stretch direction and loses the support on both sides of the shrink direction, the stretch direction is closer to the center side of the direction LD orthogonal to the stretch direction ED within the range where continuity in the direction orthogonal to the shrink direction can be maintained. It shrinks to the center side until it balances, and the joint hole 31 expands in the expansion-contraction direction ED.

When such a manufacturing method is adopted, the first sheet layer 20A and the second sheet layer 20B can be used without any particular limitation as long as they are weldable. A nonwoven fabric containing a plastic resin component can be suitably used. The basis weight of the nonwoven fabric used for the first sheet layer 20A and the second sheet layer 20B is preferably about 10 to 25 g/m ² .

As the elastic film 30, a non-porous film or a film having a large number of holes or slits for ventilation can be used. In particular, the tensile strength in the width direction WD (stretching direction ED, MD direction) is 8 to 25 N / 35 mm, the tensile strength in the front-back direction LD (direction perpendicular to the stretching direction XD, CD direction) is 5 to 20 N / 35 mm, the width direction The elastic film 30 preferably has a tensile elongation of 450 to 1050% in the WD and a tensile elongation of 450 to 1400% in the longitudinal direction LD. Although the thickness of the elastic film 30 is not particularly limited, it is preferably about 20 to 40 μm.

The stretchable sheet 51 having the elastic film 30 described above is contracted in the width direction WD by the shrinkage force of the elastic film 30 and has the stretchable region 80 that can be stretched in the width direction WD. That is, as shown in FIGS. 7 and 8, the elastic film 30 remains uninterrupted in the width direction WD in the elastic region 80, and the contractile force of the elastic film 30 causes the first sheet layer 20A and the second sheet layer 20B to expand. Such stretchability can be imparted by arranging the sheet joints 40 so as to contract to form contraction folds 51F.

In the elastic region 80, the elastic film 30 may or may not have a linearly continuous portion 32 along the width direction WD as in the example shown in FIG.

In the stretchable region 80, when the stretchable sheet alone is in its natural length state, as shown in FIG. A contracted fold 51F extending in the front-rear direction LD is formed, and even in a state of being stretched to some extent in the width direction WD, the contracted fold 51F is stretched but remains. In these states, the inner peripheral edge of the joint hole 31 in the elastic film 30 is separated from the outer peripheral edge of the sheet joint portion 40 in the stretching direction to open the gap 33, and the material of the elastic film 30 is a non-porous film or sheet. Even so, this gap 33 adds air permeability and liquid permeability. In particular, when the elastic film 30 has a linearly continuous portion 32 along the width direction WD, further shrinkage of the elastic film 30 causes the joint hole 31 to narrow in the natural length state. A gap 33 is hardly formed between 31 and the sheet joint portion 40, and the gap 33 remains when the elastic film 30 does not have a linearly continuous portion along the width direction WD.

In particular, as shown in FIG. 17A, the pattern of the sheet joints 40 in the stretchable region 80 includes joint rows 81 in which the sheet joints 40 are arranged in the front-rear direction LD, and the sheet joints 40 are arranged over the entire front-rear direction LD. It is preferable that the non-bonded bands 82 have a stripe pattern that is alternately and repeatedly provided in the width direction WD. As a result, as shown in FIG. 17(b), large folds 51F and grooves linearly continuous in the front-rear direction LD are alternately and repeatedly formed in the width direction WD on the surface of the stretchable sheet 51. Also on the back side, it is possible to suppress lateral movement of excrement and promote movement in the front-rear direction LD.

It is desirable that the elastic limit elongation in the width direction WD of the elastic region 80 is 190% or more (preferably 200 to 220%). The elastic limit elongation of the stretchable region 80 is substantially determined by the elongation rate of the elastic film 30 at the time of manufacture, but based on this, it decreases due to factors that inhibit contraction in the width direction WD. The main factor of such a hindrance is the ratio of the length L of the sheet joint portion 40 per unit length in the width direction WD, and the larger the ratio, the lower the elastic limit elongation. Normally, the length L of the sheet joints 40 has a correlation with the area ratio of the sheet joints 40 , so the elastic limit elongation of the elastic region 80 can be adjusted by the area ratio of the sheet joints 40 .

When the elastic film 30 has a portion 32 that continues linearly along the width direction WD as in the example shown in FIG. It can be adjusted by summing the orthogonal dimension 32w (equal to the joint hole interval 31d) of the linearly continuous portion 32 (see FIG. 7(a)) along the direction WD.

The area ratio of the sheet joints 40 in the stretchable region 80 and the area of each individual sheet joint 40 can be determined as appropriate, but in normal cases, it is preferable to set them within the following range.
Area of sheet joint 40: 0.14 to 3.5 mm ² (especially 0.14 to 1.0 mm ² )
Area ratio of sheet joint 40: 1.8 to 19.1% (especially 1.8 to 10.6%)

In this way, since the elastic limit elongation and elongation stress of the elastic region 80 can be adjusted by the area of the sheet joint 40, a plurality of regions having different area ratios of the sheet joint 40 are provided in the elastic region 80, and Elasticity can be varied.

In order to facilitate the formation and arrangement of the elastic sheet 51 and to control the liquid permeability, as shown in FIGS. The stretchable sheet 51 is continued to the rear side of the raised portion 53, the non-stretchable region 70 is formed on the rear side of the non-raised portion 54 of the stretchable sheet 51, and the above-mentioned stretchable regions 80 are formed on both sides in the width direction WD. preferable. In the non-stretchable region 70, the area ratio of the gap 33 formed between the outer circumference of the sheet joint portion 40 and the inner circumference of the joint hole 31 in the state of natural length is 10 to 30%, and the width direction of the stretchable region 80 is The elastic limit elongation of WD is a region of 130% or less. The elastic limit elongation of the non-stretchable region 70 is preferably 120% or less, more preferably 110% or less, and particularly preferably 100%.

The shape of each sheet joint portion 40 in the non-stretchable region 70 is not particularly limited, and can be appropriately selected from shapes similar to those described in the section on the stretchable region 80 .

In addition, the area ratio of the sheet joints 40 in the non-stretchable region 70 and the area of the individual sheet joints 40 can be determined as appropriate. Since the non-stretchable region 70 is small and the area ratio of the sheet joint portion 40 is low, it is preferable because the non-stretchable region 70 does not become hard.
Area of sheet joint 40: 0.10 to 0.75 mm ² (especially 0.10 to 0.35 mm ² )
Area ratio of sheet joint 40: 4 to 13% (especially 5 to 10%)

The non-stretchable region 70 is formed by densely arranging the sheet joints 40 so that the first sheet layer 20A and the second sheet layer 20B are not shrunk by the contractile force of the elastic film 30 and the folds 51F are not formed. can be done. Specific examples of methods for forming the non-stretchable region 70 include those described in Patent Documents 4 to 7, for example. 9 and 10 show an example of the non-stretchable region 70 described in Patent Document 7. FIG. In the non-stretchable region 70, the joint holes 31 are arranged in a zigzag pattern more densely than a certain degree, and although the elastic film 30 is continuous in the stretch direction ED, the presence of the joint holes 31 causes the joint holes 31 to linearly extend along the stretch direction ED. It does not have continuous parts. In this case, as shown in FIGS. 9 and 10, the gap 33 is opened with substantially the same size in both the natural length state and the unfolded state.

When the stretchable sheet 51 has such a non-stretchable region 70 , even if the upper layer portion 50 has the non-raised portions 54 between the raised portions 53 , the single stretchable sheet 51 can stretch the non-raised portions 54 . By providing the non-stretchable region 70 and leaving the portions positioned on both sides thereof as the stretchable regions 80, the manufacturing can be facilitated. A gap 33 between the inner periphery of the joint hole 31 formed in the elastic film 30 and the outer periphery of the sheet joint portion 40 serves as a passage through which gas and liquid pass in the thickness direction. It is open and less open in the elastic region 80 . That is, in the present absorbent article, as a whole, backflow from the lower absorbent body 23B is less likely to occur, and particularly, backflow from the lower absorbent body 23B is less likely to occur in the protuberances 53 closer to the skin.

Even in the non-stretchable region 70, for example, if the elastic film 30 exists over the entire area, the liquid permeability is reduced accordingly. In addition, it is preferable that the inelastic film region 71 continuous in the front-rear direction LD is provided in a single line or in a plurality of lines in the width direction WD, since the liquid permeability of the non-stretchable region 70 is increased. Such inelastic film regions 71 can be formed by cutting the elastic film 30 at intervals in the width direction WD. As a method for cutting the elastic film 30, the method described in Patent Document 5 can be preferably used.

<Description of terms in the specification>
When used in the specification, the following terms shall have the following meanings, unless stated otherwise in the specification.

・"Front-back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left-right direction) indicated by WD in the figure. are orthogonal.

・"MD direction (machine direction or line flow direction)" and "CD direction (horizontal direction perpendicular to MD direction)" mean the "MD direction" and "CD direction" of the processing equipment, either One is the front-rear direction and the other is the width direction. Moreover, the MD direction in the product is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. It can be determined by a simple measurement method for determining the orientation direction. In the illustrated embodiment, the longitudinal direction is the MD direction and the width direction is the CD direction, like most disposable diaper products.

- The "front side" means the side closer to the wearer's skin when worn, and the "back side" means the side farther from the wearer's skin when worn.

- "Front" means the side of the member that is closer to the wearer's skin when worn, and "back" means the side that is farther from the wearer's skin when worn.

・"Elastic limit elongation (maximum elongation)" is the maximum value of elongation in the stretching direction ED (in other words, the first sheet layer and the second sheet layer contraction (including all contractions such as contraction by elastic members) and slackness The length of the unfolded state is expressed as a percentage when the natural length is 100%.

・"Area ratio" means the ratio of the target portion to the unit area, and the total area of the target portion (for example, the sheet joint portion 40, the joint hole 31) in the target region (for example, the stretchable region 80, the non-stretchable region 70) It is expressed as a percentage by dividing it by the area of the target region. Particularly, the "area ratio" in the area having the elastic structure means the area ratio in the unfolded state. In a form in which a large number of target portions are provided at intervals, it is desirable to determine the area ratio by setting the target region to a size that includes 10 or more target portions.

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

- "Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as the basis weight.

・The "thickness" of the absorber is measured by Ozaki Seisakusho Co., Ltd.'s thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measuring range 0 to 35 mm) or model K-4 (measuring range 0 to 50 mm)). Measure by placing the sample and the thickness gauge horizontally.

• "Thickness" other than the above is automatically measured using an automatic thickness gauge (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 (breaking elongation)" are in accordance with JIS K7127: 1999 "Plastics - Test method for tensile properties -" except that the test piece is a rectangular shape with a width of 35 mm and a length of 80 mm. means a value measured with an initial chuck interval (distance between gauge lines) of 50 mm and a tensile speed of 300 mm/min. As a tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

・"Elongational stress" is determined according to JIS K7127:1999 "Plastics - Tensile property test method -" by a tensile test with an initial chuck interval (marked line distance) of 50 mm and a tensile speed of 300 mm / min. , means the tensile stress (N/35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test subject. It is preferable that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more. converted to In addition, even if the target area is small and sufficient test pieces cannot be collected, if the magnitude of the tensile stress is compared, it is possible to at least compare even small test pieces as long as the test pieces of the same size are used. . As a tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

・The amount of water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".

・The water absorption rate is the "time to the end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymer" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .

・"Artificial urine" contains urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97 09 wt% and used at a temperature of 40°C unless otherwise specified.

- The "deployed state" means a state of being flatly unfolded without contraction (including any contraction such as contraction due to an elastic member) or slack.

・Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

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

The present invention can be used regardless of the form, such as a pad-type disposable diaper such as the above example, a tape-type disposable diaper, a pants-type disposable diaper, etc., and can also be used for absorbent articles other than disposable diapers, such as sanitary napkins. It is available.

20A... First sheet layer, 20B... Second sheet layer, 21... Liquid-impermeable sheet, 22... Top sheet, 23A, 23B... Absorbent body, 23A... Upper absorbent body, 23B... Lower absorbent body, 24... Three-dimensional gathers , 24s... Gather sheet, 25... Intermediate sheet, 26A, 26B... Packaging sheet, 26A... Upper packaging sheet, 26B... Lower packaging sheet, 27... Exterior sheet, 30... Elastic film, 31... Joint hole, 33... Gap, 40 ... Sheet joint part 50 ... Upper layer part 51 ... Elastic sheet 52 ... Lower layer part 53 ... Raised part 70 ... Non-stretchable region 71 ... Inelastic film region 80 ... Stretchable region 200 ... Pad type disposable diaper, B2... rear portion, C2... crotch portion, F2... front portion, LD... front-back direction, WD... width direction, 50a... non-joint portion, 50b... joint portion, 54... non-protuberance portion, 53B... easily bendable portion, 81 ... joined rows, 82 ... non-joined strips.

Claims (7)

a stretchable sheet that is elastically stretchable in the width direction and that is built into at least both sides of the crotch in the width direction;
an upper layer portion located on the front side of the elastic sheet and including an upper absorbent body;
a lower layer portion located on the back side of the elastic sheet and including a lower absorbent body,
The upper layer portion has raised portions positioned at least on both sides in the width direction of the crotch portion and raised to the front side,
The stretchable sheet has a first portion that overlaps the raised portion and second portions adjacent to both sides in the width direction thereof,
The upper layer portion includes a joint portion formed by joining the second portion of the stretch sheet and a non-joint portion located between the joint portions and not joined to the first portion of the stretch sheet. has
The raised portion is a portion raised by pushing up the non-joined portion by bringing the joined portion closer to the width direction due to elastic contraction of the stretchable sheet.
An absorbent article characterized by: The upper layer portion has a non-raised portion between the raised portions,
The stretchable sheet extends from the back side of one raised portion to the back side of the other raised portion through the back side of the non-raised portion, and has a non-stretchable region located on the back side of the non-raised portion, and the non-stretchable region. and elastic regions located on both sides in the width direction of
The stretchable region and the non-stretchable region have a liquid-permeable first sheet layer, a liquid-permeable second sheet layer, and an elastic film interposed therebetween, and the first sheet the layer and the second sheet layer are welded together at spaced sheet joints through joint holes passing through the elastic film;
The elastic region is contracted in the width direction due to the contraction of the elastic film, and is a region that can be stretched in the width direction with the expansion of the gap between the outer circumference of the sheet joint portion and the inner circumference of the joint hole. ,
In the non-stretchable region, the area ratio of the gap formed between the outer circumference of the sheet joint and the inner circumference of the joint hole in the state of natural length is 10 to 30%, and the width direction of the stretchable region The elastic limit elongation is a region of 130% or less,
The absorbent article according to claim 1. In the middle of the non-stretchable region in the width direction, an inelastic film region continuous in the front-rear direction is provided with a line or a plurality of lines spaced apart in the width direction.
The absorbent article according to claim 2. In the elastic region, joint rows in which the sheet joints are arranged in the front-rear direction and non-joint bands that do not have the sheet joints throughout the front-rear direction are alternately and repeatedly provided in the width direction.
4. The absorbent article according to claim 2 or 3. At least the surface of the stretchable sheet opposite to the joint side of the raised portion is directly or indirectly joined to the surface of the lower absorbent body,
The absorbent article according to any one of claims 1-4. The raised portion has an easily bendable portion extending in the front-rear direction in the middle portion in the width direction,
The absorbent article according to any one of claims 1-5. The upper absorbent body consists only of pulp fiber aggregates or contains superabsorbent polymer particles in pulp fiber aggregates,
The fiber basis weight of the pulp fiber assembly is 65 to 140 g/m ² ,
The superabsorbent polymer particles have a basis weight of 0 to 200 g/m ² ,
The absorbent article according to any one of claims 1-6.

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