JP2020151085A - Disposable diaper - Google Patents

Abstract

To provide an air-permeable disposable diaper capable of preventing breaking of a waist stretchable sheet arranged on the back side.SOLUTION: An end flap part is formed on both sides in a back and forth direction of an absorber, a side flap part is formed on both sides in a width direction of the absorber, and a rectangular waist stretchable sheet whose longitudinal direction goes along the width direction is formed between a top sheet and an exterior sheet forming the end flap part on the back side. The waist stretchable sheet is formed by: a first waist sheet that folds a non-woven fabric waist sheet inside and is arranged on the side opposite the body; a second waist sheet arranged on the body side; and a long, narrow elastic stretchable member that is stretched along the width direction fixed between the first waist sheet and the second waist sheet. First and second openings formed on the first and second waist sheets are separated at regular intervals in a plane view, and the elastic stretchable member is provided between the first and second openings adjacent to the first and second openings in a back and forth direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to a disposable diaper, and more particularly to a disposable diaper having excellent breathability on the dorsal side.

In conventional disposable diapers, a technique has been known in which an exterior sheet provided on the opposite side of a liquid-impermeable back sheet is formed by laminating sheets having two openings to improve air permeability. (Patent Document 1)

Japanese Unexamined Patent Publication No. 2015-128573

However, in the technique of Patent Document 1, when the pants or the like are worn, the fastener or the like of the pants may come into contact with the opening of the exterior sheet, and the exterior sheet may be broken from the opening. Further, since the two sheets are laminated to form the exterior sheet, there is a possibility that the openings of the sheets may partially overlap each other and the peel strength may decrease.

Therefore, an object of the present invention is to provide a disposable diaper having excellent breathability and capable of preventing breakage of a waist elastic sheet or the like.

The present invention that solves the above problems is as follows.
The first means is a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber provided between the top sheet and the back sheet, and a non-woven fabric provided on the opposite side of the back sheet. In disposable diapers with an exterior sheet made of
End flaps are formed on both sides of the absorber in the front-rear direction, side flaps are formed on both sides in the width direction of the absorber, and the top sheet and exterior sheet forming the end flaps on the back side. A rectangular waist elastic sheet along the longitudinal direction in the width direction is provided between them, and the waist elastic sheet is a first waist sheet arranged on the opposite side of the body by folding the waist sheet made of non-woven fabric inward. It is formed of a second waist sheet arranged on the body side and an elongated elastic elastic member fixed between the first waist sheet and the second waist sheet and extending along the width direction, and is formed in a plan view. The first opening formed in the first waist sheet and the second opening formed in the second waist sheet adjacent to the first opening are separated by a predetermined interval, and the first opening is separated. The elastic telescopic member is provided between the first opening adjacent to the portion in the front-rear direction and between the second opening adjacent to the second opening in the front-rear direction.

The second means is characterized in that, in the configuration of the first means, the first opening and the second opening are separated in the width direction in a plan view.

In the configuration of the first or second means, the third means has both side portions of the waist telescopic sheet in the width direction facing the side flap portions, and the dorsal portion of the waist telescopic sheet in the front-rear direction on the dorsal side. It is characterized in that it extends to the vicinity of the dorsal side of the end flap portion, and the ventral portion of the waist telescopic sheet in the front-rear direction is extended so as to overlap the dorsal portion of the absorber.

The fourth means is characterized in that, in the configuration of the third means, the elastic elastic member provided at the portion of the waist elastic sheet that overlaps with the absorber is shredded in a plan view.

In the configuration of the means according to any one of the first to fourth means, the fifth means forms an adhesive layer for bonding the first waist sheet and the second waist sheet at a predetermined interval in the width direction in a plan view. It is characterized in that a non-adhesive layer having the first opening and the second opening formed is provided between the adhesive layer and the adhesive layer adjacent to each other in the width direction.

The sixth means is characterized in that, in the configuration of the means according to any one of items 1 to 5, the back side portion of the back sheet is positioned on the antibody surface side of the back side portion of the absorber in the front-rear direction. And.

According to the first means, the top sheet has end flaps formed on both sides in the front-rear direction of the absorber, side flaps formed on both sides in the width direction of the absorber, and end flaps on the back side. A rectangular waist elastic sheet is provided between the outer sheet and the outer sheet along the longitudinal direction in the width direction, and the waist elastic sheet is arranged on the opposite side of the body by folding the waist sheet made of non-woven fabric inward. A flat surface formed by a second waist sheet arranged on the waist sheet and the body side, and an elongated elastic elastic member fixed between the first waist sheet and the second waist sheet and extending along the width direction. In the visual direction, the first opening formed in the first waist sheet and the second opening formed in the second waist sheet adjacent to the first opening are separated by a predetermined interval, and the first opening is separated. Since elastic elastic members are provided between the first opening adjacent to each other in the front-rear direction and between the second opening and the second opening adjacent to the second opening in the front-rear direction, the moisture inside the disposable diaper can be removed from the waist elastic sheet. It can be exhausted to the outside through the air to increase the air permeability of the disposable diaper. Further, it is possible to prevent the fastener or the like of the external pants from coming into direct contact with the first opening and the second opening of the waist elastic sheet, and to suppress the breakage of the waist elastic sheet. Further, since the first opening and the second opening adjacent to the first opening are separated by a predetermined distance, the facing surfaces of the first waist sheet and the second waist sheet are brought close to each other and firmly. Can be fixed.

According to the second means, in addition to the effect of the first means, in the plan view, the first opening and the second opening are separated in the width direction, so that the elastic elastic member is separated from the first opening and the second opening. It is possible to prevent the vicinity of the portion from extending in the width direction, and to bring the facing surfaces of the first waist sheet and the second waist sheet closer to each other and fix them more firmly.

According to the third means, in addition to the effect of the first or second means, both sides of the waist telescopic sheet in the width direction face the side flaps, and the dorsal part of the waist telescopic sheet in the front-rear direction is the dorsal side. It extends to the vicinity of the dorsal part of the end flap part of the waist, and the ventral part in the anteroposterior direction of the waist elastic sheet extends so as to overlap the dorsal part of the absorber, so that the moisture inside the disposable diaper is removed. The air permeability of the disposable diaper can be further enhanced by exhausting the air to the outside through the waist elastic sheet in which a large number of first openings and second openings are formed.

According to the fourth means, in addition to the effect of the third means, the elastic elastic member provided at the portion of the waist elastic sheet that overlaps with the absorber is shredded, so that the elastic elastic member absorbs the elastic member by the contraction force. It is possible to prevent twisting of the body.

According to the fifth means, in addition to the effect of the means according to any one of the first to fourth means, in a plan view, the adhesive layer for bonding the first waist sheet and the second waist sheet is provided at a predetermined interval in the width direction. Since a non-adhesive layer having a first opening and a second opening formed is provided between the adhesive layer and the adhesive layer adjacent to each other in the width direction, the moisture inside the disposable diaper is released to the first opening. In addition to the portion and the second opening, the non-adhesive layer formed around the first opening and the second opening can also be exhausted to the outside to further enhance the air permeability of the disposable diaper.

According to the sixth means, in addition to the effect of the means according to any one of the first to fifth means, the back side portion of the back sheet is positioned on the antibody surface side of the back side portion of the absorber in the front-rear direction. Therefore, the moisture inside the disposable diaper can be efficiently exhausted to the outside through the waist elastic sheet without the back sheet becoming an obstacle.

It is a top view of the body side of a disposable diaper. It is a top view of the opposite body side of a disposable diaper. It is a cross-sectional view of X1-X1 of FIG. It is an enlarged plan view of the back side part of FIG. It is a cross-sectional view of Y1-Y1 of FIG. It is explanatory drawing of the manufacturing method of the waist elastic sheet of 1st Embodiment. It is a cross-sectional view of X2-X2 of FIG. It is explanatory drawing of the manufacturing method of the waist elastic sheet of 2nd Embodiment.

A disposable diaper with excellent breathability on the dorsal side will be described. In the present specification, the "front-back direction" means a direction connecting the ventral side and the dorsal side, and the "width direction" means a direction orthogonal to the front-back direction.

As shown in FIGS. 1 to 3, the disposable diapers of the present embodiment include a liquid-permeable top sheet 10 provided on the body side, a liquid-impermeable back sheet 11 provided on the opposite body side, and a top. It is formed of an absorbing element 20 provided between the sheet 10 and the back sheet 11. Further, the absorbing element 20 is formed of the absorbing body 21 and the packaging sheet 22 that wraps the absorbing body 21.

An exterior sheet 12 is provided on the antibody side surface of the back sheet 11. Further, an intermediate sheet 15 is provided between the top sheet 10 and the absorbing element 20 to move the excrement that has passed through the top sheet 10 to the absorbing element 20 and prevent the excrement from returning.

Three-dimensional gathers 30 are provided on both sides of the absorbing element 20 in the width direction to prevent excrement from leaking to the outside at predetermined intervals. The three-dimensional gather 30 is formed of a gather sheet 31 that is substantially continuous in the width direction and an elongated elastic elastic member 32 that is fixed in an extended state along the front-rear direction of the gather sheet 31.

On the outside of the base of the three-dimensional gather 30, flat gathers 40 are formed at predetermined intervals to prevent urination from leaking to the outside. The flat gather 40 is formed of an elongated elastic elastic member 41 fixed between the back sheet 11, the gather sheet 31, the exterior sheet 12, and the back sheet 11 and the gather sheet 31 in an elongated state in the front-rear direction. Has been done.

End flap portions EF are formed on both sides of the absorbing element 20 in the front-rear direction, and side flap portions SF are formed on both sides of the absorbing element 20 in the width direction. The end flap portion EF is formed of a top sheet 10, a back sheet 11, and an exterior sheet 12, and the absorbing element 20 does not extend. Further, the side flap portion SF is formed of the gather sheet 31 and the exterior sheet 12, and the absorbing element 20 does not extend.

The dorsal end flap EF is provided with a waist telescopic sheet 60 having a plurality of openings 63 that expand and contract in the width direction. As a result, the disposable diaper can be securely fitted to the back side of the wearer.

Fastening tapes 50 are provided on both sides of the side flap portion SF in the width direction of the dorsal portion. The fastening tape 50 is formed of a base material 51 fixed to the side flap SF and a locking portion 52 provided on the side surface of the body of the base material 51.

On the ventral side of the antibody side surface of the exterior sheet 12, a rectangular target sheet 55 extending in the width direction with a predetermined interval in the front-rear direction in which the locking portion 52 of the fastening tape 50 is locked is provided. It is provided.

As shown in FIGS. 4 and 5, the waist elastic sheet 60 is located on the dorsal side of the disposable diaper and the waist sheet 61 which is folded toward the ventral side and the waist sheet 61 which is folded and on the opposite side of the body. In the front-rear direction between the waist sheet (hereinafter referred to as "first waist sheet" for convenience) 61A and the waist sheet (hereinafter referred to as "second waist sheet" for convenience) 61B which is folded and located on the body side. It is formed of an elongated elastic stretchable member 62 fixed in an extended state extending in the width direction at a predetermined interval.

In the folded state of the waist sheet 61, a circular first opening 63A having a predetermined diameter formed in the first waist sheet 61A and a circular second having a predetermined diameter formed in the second waist sheet 61B. The openings 63B are arranged apart from each other in the width direction with a predetermined interval. Further, in the side view, the dorsal end of the backsheet 11 is located on the opposite side of the dorsal end of the absorbing element 20. As a result, the moisture in the disposable diaper can be efficiently exhausted to the outside via the first waist sheet 61A, the second waist sheet 61B, and the exterior sheet 12, and the wearer's skin is prevented from getting stuffy or having a rash. can do.

Both sides of the waist stretchable sheet 60 in the width direction extend outward in the width direction from both sides of the absorber 20, and the left side of the waist stretchable sheet 60 is provided on the left side flap SF. It is located on the extension line of the elastic elastic member 41, and the right portion of the waist elastic sheet 60 is located on the extension line of the elastic elastic member 41 provided on the right side flap SF. As a result, the elastic elastic member 41 and the elastic elastic member 62 can be efficiently expanded and contracted in the front-rear direction without interfering with each other, and the elastic elastic member 62 can be efficiently expanded and contracted in the width direction.

The ventral portion of the waist telescopic sheet 60 in the anteroposterior direction is located ventral to the dorsal end of the absorbing element 20, and the dorsal portion of the waist telescopic sheet 60 in the anteroposterior direction is the dorsal portion of the end flap EF in the anterior-posterior direction. It is located at the side end. As a result, the disposable diaper can be more reliably fitted to the back side of the wearer.

The elastic elastic member 62 provided at the waist elastic sheet 60 portion overlapping with the absorbing element 20 is shredded. As a result, the elastic force of the elastic elastic member 62 in the width direction does not act on the waist elastic sheet 60 portion that overlaps with the absorbent element 20, so that the absorption element 20 can be prevented from being deformed.

<Waist elastic sheet of the first embodiment>
Next, a method of manufacturing the waist elastic sheet 60 of the first embodiment will be described.

In the first step shown in FIG. 6A, a rectangular waist sheet 61 formed along the longitudinal direction along the CD direction is prepared. The waist sheet 61 is made of a non-woven fabric having a fiber texture of 5 to 25 g / m ² processed by a spunlace method, a spunbond method, a thermal bond method, or an air-through method.

Due to the folding line 65 extending in the CD direction located in the center of the MD direction, the waist sheet 61 is the first waist sheet 61A located on the downstream side in the MD direction and the second waist sheet 61B located on the upstream side in the MD direction. It is divided into.

A plurality of first openings 63A are formed in the first waist sheet 61A at predetermined intervals in the MD direction and the CD direction. The diameter of the first opening 63A formed in a circle is formed to be 0.3 to 3 mm, and the distance between the first opening 63A and the first opening 63A adjacent to the MD direction is formed to be 1 to 5 mm. The distance between the 1 opening 63A and the first opening 63A adjacent to the CD direction is 4 to 20 mm. The shape of the first opening 63A is not particularly limited, and may be formed into an oval diameter or a rectangle in addition to a circle.

The second waist sheet 61B is formed with a plurality of second openings 63B at predetermined intervals in the MD direction and the CD direction. The diameter of the second opening 63B formed in a circle is formed to be 0.3 to 3 mm, and the distance between the second opening 63B and the second opening 63B adjacent to the MD direction is formed to be 1 to 5 mm. The distance between the two openings 63B and the second opening 63B adjacent to the CD direction is 4 to 20 mm. The shape of the second opening 63B is not particularly limited, and may be formed into an oval diameter or a rectangle in addition to a circle.

The distance between the first opening 63A and the folding line 65 adjacent to the folding line 65 in the MD direction is the same as the distance between the second opening 63B and the folding line 65 adjacent to the folding line 65 in the MD direction. The distance between the first opening 63A and the second opening 63B adjacent to the first opening 63A in the direction is formed to be 1 to 5 mm. As a result, when the second waist sheet 61B is folded on the upper surface of the first waist sheet 61A by the folding line 65, the first opening 63A and the second opening 63B are separated in the CD direction and separated by a predetermined interval. Can be positioned.

Further, as shown in FIG. 7, a first burr portion 64A formed on the outer peripheral portion of the first opening 63A of the first waist sheet 61A and protruding from the upper surface, and a second opening 63B of the second waist sheet 61B. Since the second burr portion 64B formed on the outer peripheral portion and protruding from the upper surface can be separated in the CD direction and positioned at a predetermined distance, the peel strength of the first waist sheet 61A and the second waist sheet 61B can be increased. It is possible to prevent the decrease.

Next, in the second step shown in FIG. 6B, a hot melt adhesive is applied to the entire upper surface of the first waist sheet 61A to form the adhesive layer 66. As a result, when the second waist sheet 61B is folded on the upper surface of the first waist sheet 61A along the folding line 65, the second waist sheet 61B can be securely fixed to the upper surface of the first waist sheet 61A.

Next, in the third step shown in FIG. 6C, an elongated shape is formed between the first opening 63A of the first waist sheet 61A and the first opening 63A adjacent to the MD direction in an elongated state along the CD direction. After fixing the elastic elastic member 62 of the above, the intermediate portion of the elastic elastic member 62 provided on the downstream side in the MD direction of the first waist sheet 61A is the first opening 63A and the first opening adjacent to the CD direction. Cut between 63A. As a result, it is possible to prevent the stretching force in the width direction from acting at the portion of the waist elastic sheet 60 that overlaps with the absorbing element 20. The elastic elastic member 62 has a thickness of 420 to 1120 dtex, and an elongation rate of about 150 to 250% is set.

Next, in the fourth step shown in FIG. 6D, the second waist sheet 61B is folded along the folding line 65 so that the upper surface of the second waist sheet 61B becomes the upper surface of the first waist sheet 61A. The elastic sheet 60 is formed.

<Waist elastic sheet of the second embodiment>
Next, a method of manufacturing the waist elastic sheet 60 of the second embodiment will be described. The same members as those of the waist telescopic sheet 60 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the second step shown in FIG. 8B, a hot melt adhesive is applied to the upper surface of the first waist sheet 61A at predetermined intervals in the CD direction, and the MD has a predetermined length in the CD direction. A rectangular adhesive layer 67 is formed over the entire length in the direction. On the other hand, a rectangular non-adhesive layer 67 having a predetermined length in the CD direction and extending the entire length in the MD direction is formed on the upper surface of the first waist sheet 61A where the opening 63A is formed. ..

As a result, when the second waist sheet 61B is folded on the upper surface of the first waist sheet 61A along the folding line 65, the moisture in the disposable diaper is removed from the first opening 63A and the second waist sheet 61B of the first waist sheet 61A. In addition to the second opening 63B, the non-adhesive layer 68 formed around the first opening 63A and the second opening 63B can also be exhausted to the outside, so that the wearer's skin is stuffy and has a rash. Etc. can be prevented more.

The first step shown in FIG. 8A, the third step shown in FIG. 8C, and the fourth step shown in FIG. 8D are shown in FIG. 6A of the first embodiment, respectively. Since it is the same as the first step, the third step shown in FIG. 6 (c), and the fourth step shown in FIG. 6 (d), the description thereof will be omitted.

Next, the material and the characteristic portion of the top sheet 10 and the like will be described in order.
(Top sheet)
The top sheet 10 is made of a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like. In addition, the non-woven fabric is not particularly limited as to what the raw material fiber is. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, the spunlace method is preferable when flexibility and drapeability are required, and the thermal bond method is preferable when bulkiness and softness are required.

(Back sheet)
The back sheet 11 is an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a non-woven fabric in which a waterproof film is interposed to ensure substantially liquid impermeability (in this case, a waterproof film). The back sheet is composed of the non-woven fabric and the non-woven fabric.) Of course, in addition to this, a material having liquid impermeableness and moisture permeability, which has been favorably used from the viewpoint of preventing stuffiness in recent years, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then stretched in the uniaxial or biaxial direction. The microporous sheet thus obtained can be exemplified. Furthermore, it is waterproofed by a non-woven fabric using microdenyl fibers, enhanced leak resistance by reducing the air gaps of the fibers by applying heat or pressure, and coating with a super absorbent polymer or hydrophobic resin or water repellent. A liquid-impermeable sheet without using a film can also be used as the back sheet 11.

(Exterior sheet)
The exterior sheet 12 is a portion that supports the absorbing element 20 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which both side portions in the front-rear direction are constricted, and this is a portion surrounding the wearer's legs.

The exterior sheet 12 is preferably formed of a non-woven fabric, but is not limited thereto. The type of non-woven fabric is not particularly limited, and as the material fiber, for example, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton are used. As the processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are suitable in terms of both feel and strength. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the non-woven fabrics to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the fiber texture is preferably 10 to 50 g / m ² , especially 15 to 30 g / m ² .

(Intermediate sheet)
The intermediate sheet 15 is made of the same material as the top sheet 10. The intermediate sheet 15 is preferably bonded to the top sheet 10, and when heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 15 is preferably one having a melting point similar to that of the top sheet 10. When a non-woven fabric is used for the intermediate sheet 15, the fineness of the fibers of the non-woven fabric is preferably about 2.0 to 5.0 dtex.

(Absorber)
The absorber 21 can be formed by an aggregate of fibers. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per inch, preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In many cases, uniformly crimped crimped fibers are used.

The absorber 21 preferably contains highly absorbent polymer particles, and in particular, at least in the liquid receiving region, the highly absorbent polymer particles (SAP particles) are substantially dispersed in the entire thickness direction with respect to the aggregate of fibers. Is desirable.

If there are no or very few SAP particles in the upper, lower, and intermediate parts of the absorber 21, it cannot be said that they are "dispersed in the entire thickness direction". Therefore, "distributed in the entire thickness direction" means that the fibers are "uniformly" dispersed in the entire thickness direction, as well as "unevenly distributed" in the upper part, the lower part, and / or the intermediate part. However, it also includes forms that are still dispersed in the upper, lower, and middle parts. Further, the form in which some SAP particles do not enter the fiber aggregate and remain on the surface thereof, and the form in which some SAP particles pass through the fiber aggregate and are on the packaging sheet 22 are also excluded. It's not something.

The highly absorbent polymer particles include "powder" in addition to "particles". The particle size of the highly absorbent polymer particles can be the same as that used for this kind of absorbent article, and is preferably 1000 μm or less, particularly 150 to 400 μm. The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbable polymer particles include starch-based, cellulose-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl celluloses. A product, an acrylic acid (salt) polymer, or the like can be used. As the shape of the highly absorbent polymer particles, a powder or granular material that is usually used is preferable, but other shapes can also be used.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 21 returns to the outside of the absorber 21, is likely to occur.

The amount of the highly absorbent polymer particles to be grained can be appropriately determined according to the amount of absorption required for the application of the absorber 21. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the polymer coating amount is less than 50 g / m ² , it becomes difficult to secure the absorption amount. If it exceeds 350 g / m ² , not only the effect is saturated, but also an excess of highly absorbent polymer particles gives a jerky discomfort.

(Packaging sheet)
The packaging sheet 22 is made of tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) non-woven fabric is particularly preferable, and polypropylene, polyethylene / polypropylene or the like can be used as the material. The fiber texture is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

(Three-dimensional gather)
A water-repellent non-woven fabric can be used as the gather sheet 31 of the three-dimensional gather 30, and a thread rubber or the like can be used as the elastic elastic member 32. A plurality of elastic elastic members may be provided, or one elastic member may be provided for each.

The antibody side surface of the gather sheet 31 has a fixing start end in the width direction on the side portion of the top sheet 10, and a portion outside the fixing start end in the width direction is located on the side portion of the back sheet 11 and outside in the width direction. It is fixed to the side of the exterior sheet 12 with a hot melt adhesive or the like.

Around the legs, the inside of the three-dimensional gather 30 in the width direction from the fixing start end is fixed on the top sheet 10 at both ends in the front-rear direction of the product, but the part between them is a non-fixed free part, and this free part is It comes to stand up by the contraction force of the elastic elastic member 32. When the diaper is worn, the diaper is mounted on the body in a boat shape, and the contraction force of the elastic elastic member 32 acts on the diaper. Therefore, the contraction force of the elastic elastic member 32 causes the three-dimensional gather 30 to stand up and come into close contact with the legs. .. As a result, so-called lateral leakage from around the legs is prevented.

(Plane gather)
An elastic elastic member 41 around the leg made of rubber thread or the like is fixed between the gather sheet 31 and the back sheet 11 in a stretched state in the front-rear direction. A plurality of elastic elastic members 41 around the legs may be provided, or one each may be provided.

(Fastening tape)
The base portion of the base material 51 of the fastening tape 50 is fixed between the gather sheet 31 and the exterior sheet 12 by a hot melt adhesive or the like. The base material 51 is made of a non-woven fabric, a plastic film, a polylami non-woven fabric, paper, or a composite material thereof.

The locking portion 52 is formed of a hook material of a mechanical fastener. The hook material has a large number of engaging protrusions on its outer surface side. The shapes of the engaging protrusions are (A) checkered, (B) J-shaped, (C) mushroom-shaped, (D) T-shaped, and (E) double J-shaped (J-shaped). There are shapes that are combined together), but any shape may be used. Of course, an adhesive layer can be provided as a locking portion of the fastening tape 50.

(Target sheet)
The target sheet 55 is formed of a plastic film, a non-woven fabric, or the like on which a large number of loop threads are provided on the surface.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.

-The "front-back (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal direction).
-The "front side" means the side closer to the wearer's skin, and the "back side" means the side farther from the wearer's skin. The "front surface" means the surface of the member closer to the wearer's skin, and the "back surface" means the surface farther from the wearer's skin.
-The "MD direction" and "CD direction" mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to the flow direction, and one of them is the front-rear direction of the product. The other is the width direction of the product. The MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric follow. It can be discriminated by a simple measuring method for determining the orientation direction.
-"Deployment" means a state in which it is deployed flat without shrinkage or slack.
-"Elongation rate" means a value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
-"Gel strength" is measured as follows. To 49.0 g of artificial urine, 1.0 g of a highly absorbent polymer is added and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).
-"Artificial urine" includes urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97. It is a mixture of .09 wt% and is used at a temperature of 40 ° C. unless otherwise specified.
-The "graining amount" 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%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the index.
-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load of 0.098 N / cm ² and a pressurized area of 2 cm ² .
-"Water absorption" is measured by JIS K7223-1996 "Water absorption test method for highly water-absorbent resin".
-"Water absorption rate" is the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent polymer" was performed using 2 g of superabsorbent polymer and 50 g of physiological saline. And.
-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.
-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

The present invention can be used for absorbent articles such as disposable diapers.

10 Top sheet 11 Back sheet 12 Exterior sheet 21 Absorbent 60 Waist elastic sheet 61 Waist sheet 61A 1st waist sheet 61B 2nd waist sheet 62 Elastic elastic member 63A 1st opening 63B 2nd opening 67 Adhesive layer 68 Non-adhesive layer EF end flap part SF side flap part

Claims (6)

An exterior sheet made of a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber provided between the top sheet and the back sheet, and a non-woven fabric provided on the opposite side of the back sheet. In the provided disposable diapers
End flaps are formed on both sides of the absorber in the anteroposterior direction.
Side flaps are formed on both sides of the absorber in the width direction.
A rectangular waist telescopic sheet along the longitudinal direction in the width direction is provided between the top sheet and the exterior sheet forming the end flap portion on the back side.
The waist elastic sheet includes a first waist sheet arranged on the opposite side of the body by folding the waist sheet made of non-woven fabric inward, a second waist sheet arranged on the body side, and the first waist sheet and the second waist. It is made of an elongated elastic elastic member that is fixed between the sheets and extends along the width direction.
In a plan view, the first opening formed in the first waist sheet and the second opening formed in the second waist sheet adjacent to the first opening are separated by a predetermined interval.
The elastic elastic member is provided between the first opening and the first opening adjacent to each other in the front-rear direction, and between the second opening and the second opening adjacent to the second opening in the front-rear direction. Disposable diapers. The disposable diaper according to claim 1, wherein the first opening and the second opening are separated in the width direction in a plan view. In a plan view, both sides of the waist telescopic sheet in the width direction face the side flaps, and the dorsal portion of the waist telescopic sheet in the front-rear direction is in the vicinity of the dorsal portion of the end flap on the back side. The disposable diaper according to claim 1 or 2, wherein the ventral portion in the front-rear direction of the waist elastic sheet is extended so as to overlap the dorsal portion of the absorber. The disposable diaper according to claim 3, wherein the elastic elastic member provided at a portion of the waist elastic sheet that overlaps with the absorber is shredded in a plan view. In a plan view, an adhesive layer for bonding the first waist sheet and the second waist sheet is formed at a predetermined interval in the width direction, and the first is formed between the adhesive layer and the adhesive layer adjacent to each other in the width direction. The disposable diaper according to any one of claims 1 to 4, which is provided with a non-adhesive layer having an opening and a second opening. The disposable diaper according to any one of claims 1 to 5, wherein the back side portion of the back sheet is located on the opposite side of the back side portion of the absorber in the front-rear direction.

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