JP2016189819A5 - - Google Patents

Description

Absorbent articles

  The present invention relates to an absorbent article having three-dimensional gathers on both sides.

  In order to prevent so-called side leakage, the absorbent article is firmly established to provide a belt-shaped three-dimensional gather extending in the front-rear direction on both sides in the width direction, and has an excellent fit and anti-leakage effect. At the same time, various three-dimensional gathers have been proposed so that the crotch portion has a clean appearance.

  However, the conventional three-dimensional gather reduces the sense of incongruity around the legs and prevents exudation (excretion fluid that has exuded from the side of the absorber due to the pressure applied to the absorber penetrates into the three-dimensional gather and oozes outside the three-dimensional gather To prevent).

  That is, it is desirable to equip the three-dimensional gathers double from the viewpoint of the bleeding prevention performance (see Patent Document 1). However, in this case, the thickness of the three-dimensional gathers increases, so that a sense of discomfort tends to occur around the legs. Therefore, from this point, it is desirable that the solid gather is single. However, when the three-dimensional gather is single, the excretory fluid tends to ooze out. To prevent this, a waterproof resin film is sandwiched in the three-dimensional gather (see Patent Documents 2 and 3), and provided on the back side of the absorber. A solution such as extending the waterproof resin film in the width direction and wrapping the side portion of the absorber is required (see Patent Document 4).

  However, these solutions are affected by the hardness specific to the waterproof resin film, and the flexibility of the three-dimensional gather is impaired.

  In particular, in some absorbent articles such as pants-type disposable diapers and pad-type disposable diapers, the movable range of the main body part is large, and as a three-dimensional gather with high followability to the movement of the legs, the back side of the side of the absorbent body Of the mounting portion fixed to the member, the main body portion extending from the mounting portion to the front side of the absorber through the side of the absorber, and the front-rear direction both ends and the front-rear direction intermediate portion, the front-rear direction A fixed part formed with both ends fixed in a lying state, a free part formed with the middle part in the front-rear direction unfixed, and fixed in an extended state along the front-rear direction at least at the tip of this free part A structure having a gathered elastic elastic member is known.

  However, in a three-dimensional gather with this structure, if a waterproof resin film is incorporated inside the three-dimensional gather, the hardness of the waterproof resin film also affects the side of the absorber, further reducing the flexibility of the absorber side. This may reduce the fit around the legs.

JP 2002-102282 A JP2013-255849A JP2011-229866A JP 2009-082358 A

  Therefore, the main problem of the present invention is to achieve both improvement in fit around the legs and prevention of bleeding.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorber provided in a region including the crotch portion;
A liquid-permeable top sheet provided on the front side of the absorber;
A back side liquid-impermeable sheet made of a waterproof resin film provided on the back side of the absorber;
The belt-shaped three-dimensional gathers provided on both sides in the width direction and extending in the front-rear direction,
The three-dimensional gather includes an attachment portion fixed to a member on the back side of the side portion of the absorber, a main body portion extending from the attachment portion to the front side of the absorber through the side of the absorber, and front and rear of the main body portion. Of the both ends in the direction and the intermediate portion in the front-rear direction, the lying portion formed by fixing the both ends in the front-rear direction in the lying state, the free portion formed in which the intermediate portion in the front-rear direction is not fixed, and the free portion It has a gather elastic elastic member fixed in an extended state along the front-rear direction at least at the tip.
In absorbent articles,
The three-dimensional gather does not include a waterproof resin film, and includes at least an inner nonwoven fabric layer, an outer nonwoven fabric layer, and a hot melt adhesive interposed between the inner nonwoven fabric layer and the main body portion. Have
The side edge of the back side liquid-impermeable sheet is spaced apart from the side edge of the absorber to the center in the width direction,
The side edge on the width direction center side of the water shielding layer on the back side of the absorbent body is the same as the side edge of the back side liquid-impermeable sheet or located on the width direction center side than that,
An absorbent article characterized by the above.

(Function and effect)
In the present invention, since a waterproof resin film is not provided on a three-dimensional gather, a water-shielding layer is formed with a hot melt adhesive, and a structure that ensures water shielding is basically used, so that the flexibility of the three-dimensional gather can be improved. . Also, instead of extending the back side liquid impermeable sheet to the side edge of the absorber, the water shielding layer of the three-dimensional gather extends to the back side of the side of the absorber, and the cover range by the back side liquid impermeable sheet Therefore, the hardness of the back-side liquid-impermeable sheet does not affect the side portion of the absorber. As a result, the fit around the legs can be improved while preventing bleeding. The side edge means a side edge.

<Invention of Claim 2>
2. The absorbent article according to claim 1, wherein the three-dimensional gather includes the gather elastic elastic member in a portion of the attachment portion that has the water shielding layer and does not overlap the back side liquid-impermeable sheet.

(Function and effect)
Thus, by providing a gather elastic elastic member also in the attachment part in the three-dimensional gather, the absorber side part can be lifted and fitted to the skin side, but the waterproof resin film is attached to this attachment part as before. When it has, the hardness specific to a waterproof resin film influences and the elasticity of a gather elastic elastic member is inhibited. On the other hand, as described above, the water-tightness of the three-dimensional gather is ensured by a hot-melt adhesive instead of the waterproof resin film, and the portion where the gather elastic elastic member is provided in the attachment portion has a water-shielding layer and a backside liquid. By setting it as the site | part which does not overlap with an impermeable sheet, the stretchability of a gather elastic elastic member becomes difficult to be inhibited.

<Invention of Claim 3>
The absorbent article according to claim 2, wherein a side portion of the absorbent body is not fixed to an attachment portion of the three-dimensional gather.

(Function and effect)
When gathered elastic expansion / contraction members are installed in the three-dimensional gather attachment part and the side of the absorber is lifted, if the absorber side is not fixed to the three-dimensional gather attachment part, the side of the absorber will be gather elastic expansion / contraction It is preferable because it is easy to be lifted by the member, further improving the fit around the leg, and effective in preventing bleeding.

<Invention of Claim 4>
The body part of the three-dimensional gather is composed of a root side part that goes around to the front side of the absorber and toward the center side in the width direction, and a tip side part that is folded back outward in the width direction from the tip of the root side part,
In the front-rear direction range corresponding to the lodging portion, the water shielding layer is not provided at least at the tip side portion and extends from the base side portion to the attachment portion,
In the front-rear direction range corresponding to the free part, the water shielding layer extends from the tip side part through the base side part to the attachment part,
The absorptive article according to any one of claims 1 to 3.

(Function and effect)
As a three-dimensional gather, the folding form which has the above-mentioned front end side part and a root side part is known. In such a three-dimensional gather, the lodging portion is a portion where the height of the three-dimensional gather is not present, but since it is a portion that comes into contact with the skin on the surface, flexibility is more important than water shielding. Therefore, as described above, it is preferable to make the lodging portion flexible by providing a structure in which the water shielding layer is not provided at least at the tip side portion in the front-rear direction range corresponding to the lodging portion. On the other hand, in the free part, flexibility is important, but water shielding is also important, so it is desirable to provide a water shielding layer over the tip side part. On the other hand, since the water shielding is very important in the base side portion, it is preferable that a water shielding layer is provided regardless of the lodging portion and the free portion.

<Invention of Claim 5>
The body part of the three-dimensional gather is composed of a root side part that goes around to the front side of the absorber and toward the center side in the width direction, and a tip side part that is folded back outward in the width direction from the tip of the root side part,
In the front-rear direction range corresponding to the free part, the water-blocking layer extends from the tip-side part through the base-side part into the mounting part and forms the water-blocking layer. The absorptive article according to any one of claims 1 to 4, wherein the coating amount is reduced stepwise or continuously from the attachment portion side toward the tip side.

(Function and effect)
As for the free part of the three-dimensional gather, the flexibility is more important at the tip side, and the water shielding is very important at the attachment part side. Here, when the application amount of the hot melt adhesive is increased, the water impermeability is improved although the flexibility is lowered, and when the amount is decreased, the water impermeability is lowered but the flexibility is improved. Therefore, as described above, it is desirable that the application amount of the hot melt adhesive that forms the water shielding layer is reduced stepwise or continuously from the attachment portion side toward the distal end side.

<Invention of Claim 6>
The absorbent article according to any one of claims 1 to 5, wherein the hot melt adhesive forming the water shielding layer is colored.

(Function and effect)
In the present invention, the water-tightness of the three-dimensional gather is ensured by the water-shielding layer made of a hot melt adhesive, and the three-dimensional gather does not include a white waterproof resin film that is often used conventionally. In this case, since the hot-melt adhesive is usually transparent or translucent, the color of excrement inside the three-dimensional gathers can be easily seen through the three-dimensional gathers, which may cause the user to worry about leakage. Therefore, as described above, it is also a preferable form to conceal the color of excrement by using a hot melt adhesive as a colored one.

<Invention of Claim 7>
The lodging portion has a portion without the water shielding layer over the entire longitudinal direction thereof,
The gather elastic elastic member provided in the attachment portion has a portion extending in the front-rear direction passing through the attachment portion in a front-rear direction range corresponding to the front and rear lying portions, and both front and rear portions thereof are front and rear. The absorbent article according to claim 2 or 3, wherein the absorbent article is attached so as to reach a portion without a water shielding layer of the lodging portion.

(Function and effect)
It is desirable that the water shielding layer provided in the attachment portion is continuously provided in the front-rear direction from the viewpoint of water shielding. In this case, when the gather elastic elastic member is provided along the front-rear direction in the range having the water shielding layer in the attachment portion, the gather elastic elastic member is attached over the entire length of the three-dimensional gather in the normal manufacturing method, and the absorber side part There is a possibility that the contraction force for lifting the lip acts on the entire length of the absorbent body, and the absorbent body is distorted and the fit property is lowered. On the other hand, as described above, gather elastic expansion and contraction so that it passes through the mounting portion within the front-rear direction range corresponding to the front and rear lying portions, and reaches the portion without the water shielding layer of the falling portion on both front and rear sides. When the member is attached, when the front and rear ends of the gather elastic elastic member are cut at the time of manufacture, the front and rear end portions are drawn toward the center in the front and rear direction, and the expansion and contraction range in the front and rear direction can be made shorter than the total length of the three-dimensional gather. Therefore, although this gather elastic elastic member acts to lift the absorbent body in the middle in the front-rear direction, it does not act on the absorbent body on both front and rear sides, thus preventing a decrease in fit due to unnecessary distortion of the absorbent body It will be possible.

<Invention of Claim 8>
The side seal part is formed by joining the both sides of the outer body that forms the front body extending from the crotch to the ventral side and the both sides of the outer body that forms the back body extending from the crotch to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
An interior body that includes the liquid-permeable top sheet, the back-side liquid-impermeable sheet, and the absorber interposed therebetween, and covers from the back side to the abdomen through the crotch, Attached inside,
The three-dimensional gather is a pants-type disposable diaper provided on both sides of the interior body,
The absorptive article according to any one of claims 1 to 7.

(Function and effect)
The three-dimensional gather attached to the member on the back side of the absorber, which is the subject of the present invention, is often used in pants-type disposable diapers and pad-type disposable diapers, and the fit around the legs with respect to the movement of the legs is the pants type. This is particularly required in disposable diapers. Therefore, the present invention is suitable for a pants-type disposable diaper as described in this section.

  As described above, according to the present invention, there are advantages such as being able to achieve both improved fit around the legs and prevention of bleeding.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is a perspective view of a pants type disposable diaper. It is a top view in the state where a solid gather was developed. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is a top view in the state where a solid gather was developed. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. It is a top view in the state where a solid gather was developed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing system) or the like, or the fixed portion of the elastic stretchable member is formed by application to the outer peripheral surface of an elastic stretchable member such as a comb gun or a shroud coating instead of or together with this Is. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  The pants-type disposable diaper 100 of this embodiment is provided inside the exterior body 12 so as to extend from the front body F to the back body B through the crotch part from the exterior body 12 constituting the front body F and the back body B. And the both side portions of the outer body 12 of the front body F and the both side portions of the outer body 12 of the rear body B are joined to form the side seal portion 12A. The opening formed by the front and rear end portions of the body becomes a waist opening WO through which the wearer's body passes, and the portions not joined by the side seal portions 12A on both sides in the width direction of the exterior body 12 become leg opening portions LO through which the legs are passed. It is. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. Symbol Y indicates the total length of the diaper in the unfolded state (vertical length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the unfolded state. The full width of is shown.

  Further, the pants-type disposable diaper 100 of this embodiment forms a waist region T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. And an intermediate region L defined as a front-rear direction range (between a longitudinal region having the side seal portion 12A of the front body F and a longitudinal region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where there is a boundary in the waistline region T in which the width direction expansion / contraction stress changes (for example, the thickness or elongation rate of the elastic expansion / contraction member changes), the waist opening WO side is closer to the waist opening than the boundary on the waist opening WO side. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Exterior body)
As shown in FIGS. 3 to 5, the exterior body 12 is formed by bonding two sheet materials 12 </ b> S and 12 </ b> H together with a joining means such as a hot-melt adhesive or welding. The inner sheet material 12H located on the inner side extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside. The folded portion 12r extends so as to cover up to the waist side end of the interior body 200.

The sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured 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. When using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² (the total basis weight of the exterior body 12 is about 20 to 60 g / m ² ).

  And in the exterior body 12, in order to improve the fitting property with respect to the trunk periphery, elongated elastic elastic members 15 to 19 such as thread rubber are provided at a predetermined elongation rate between the sheet materials 12S and 12H. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the two sheet materials 12S and 12H of the exterior body 12 and fixing the elongated elastic elastic members 15 to 19 sandwiched between them, a hot melt adhesive by various application methods, heat sealing, ultrasonic sealing, etc. At least one of fixing means by material welding can be used. Since the flexibility is lost when the entire exterior body 12 is firmly fixed, it is preferable that the portions other than the bonding portions of the elongated elastic stretch members 15 to 19 are not bonded or are bonded weakly. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and sandwiched between both sheet layers 12S and 12H, thereby forming the elongated shape. With only the hot melt adhesive applied to the outer peripheral surfaces of the elastic elastic members 15 to 19, fixing the elongated elastic elastic members 15 to 19 to both the sheet layers 12S and 12H and fixing between the two sheet layers 12S and 12H It has a structure to do.

More specifically, between the inner side surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the rear body B and the front body F, the entire width direction is continuous. In addition, a plurality of waist edge elastic elastic members 17 are fixed in a state where they are extended along the width direction at a predetermined extension rate at intervals in the vertical direction. In addition, one or a plurality of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower part U may overlap with the interior body 200 or may overlap with the interior body 200. You may each provide in the width direction both sides except a direction center part. As the waist edge resilient and elastic members 17, the thickness 155～1880Dtex, particularly about 300～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the lower waist portion U of the front body F and the rear body B, except for the central portion in the width direction overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member, which are continuous in the entire width direction at each of the upper and both sides in the width direction, are spaced apart in the vertical direction and have a predetermined width. It is fixed in an expanded state along the width direction at an expansion rate.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, respectively elongation 200-350%, preferably fixed in particular about 240-300%.

  Further, the width between the outer surface of the inner sheet material 12H and the inner surface of the outer sheet material 12S in the intermediate region L of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, is the width. A plurality of intermediate elastic elastic members 16 and 18 made of an elongated elastic elastic member, which are continuous in the entire width direction at each part on both sides in the direction, are spaced at intervals in the vertical direction and have a predetermined elongation rate. It is fixed in a stretched state along the direction.

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  In addition, as shown in the drawing, the waist lower elastic member 15 and the middle region elastic members 15, 19, 16, 18 are provided on both sides in the width direction except for part or all of the portion overlapping the inner body 200. If this is the case, the interior body 200 will not shrink more than necessary in the width direction, so that it will not look bad or absorb well. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. In part or all 12C, the elastic expansion / contraction member is cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are the contraction force operation portions. A configured form is also included. Of course, the arrangement of the waist lower elastic elastic members and the middle region elastic elastic members 15, 19, 16, 18 is not limited to the above example, and the elastic force acts on the entire width direction including the portion overlapping the interior body 200. As described above, a part or all of the waist lower elastic member 15 and the middle region elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side to the other side in the width direction.

  Further, in the illustrated example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the exterior body includes an abdominal exterior body that covers the abdominal side of the circumference of the wearer's torso and It is divided into a back side exterior body that covers the back side, and the front end of the interior body is connected to the inner surface of the center part in the width direction of the abdominal side exterior body by a hot melt adhesive or the like, and the width direction of the back side exterior body The rear end portion of the interior body is connected to the inner surface of the central portion by a hot melt adhesive or the like, and the abdominal exterior body and the back exterior body are not continuous on the crotch side and are separated from each other. be able to. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable sheet in the interior body, the crotch is formed so as to cover the entire back surface of the interior body or to cover the entire portion exposed between the abdominal exterior body and the back exterior body. The exterior body can also be fixed. As the crotch outer body, the same material as that used for the outer body described above can be used.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a back-side liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. These show the three-dimensional gathers 60 which stand on the wearer's skin side provided on both sides in the width direction of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

  The interior body 200 can be fixed to the exterior body 12 by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated form, it is fixed to the inner surface of the exterior body 12 by the hot melt adhesive applied to the back surface of the interior body 200, that is, in this case, the back surface of the back-side liquid-impermeable sheet 11 and the attachment portion 65 of the three-dimensional gather 60. ing.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured 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, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  Both sides of the top sheet 30 pass between the back side liquid-impermeable sheet 11 and the three-dimensional gather 60 to reach the back side of the absorbent element 50, and in order to prevent liquid penetration, the back-side liquid-impermeable sheet 11 and It is preferable to join to the three-dimensional gather 60.

  The top sheet 30 is fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing or a top sheet hot melt adhesive 31 for the purpose of preventing displacement with respect to the back side member. It is desirable. In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 on the front side of the absorber 56 by the top sheet hot melt adhesive 31 applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

  The intermediate sheet 40 is fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or an intermediate sheet hot melt adhesive 41 for the purpose of preventing positional displacement with respect to the back side member. It is desirable. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 by an intermediate sheet hot melt adhesive 41 applied to the back surface thereof.

(Liquid impervious sheet)
The material of the back side liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the back-side liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the back-side liquid-impermeable sheet 11.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the back side liquid-impermeable sheet 11, especially the absorber 56 side surface.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 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 crimp of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm . Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Moreover, the dimension of the absorber 56 can be appropriately determined as long as it extends to the front, rear, left and right of the urination port position, but it preferably extends to the peripheral portion of the interior body or the vicinity thereof in the front-rear direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of disposable diaper can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the top is preferably 30% by weight or less, and the proportion of particles remaining on the screen by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent 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 speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the amount of the liquid excretion site more than other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, and rises from the side portion of the interior body 200 and travels in the lateral direction along the top sheet 30. Is provided to prevent side leakage.

  More specifically, the three-dimensional gather 60 is formed by folding a belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folding it into two, thereby forming the inner nonwoven fabric layer 62a and the outer nonwoven fabric. A multilayer structure having a layer 62b and a plurality of elongated gather elastic elastic members 63 extending along the longitudinal direction and spaced apart in the width direction between the inner nonwoven fabric layer 62a and the outer nonwoven fabric layer 62b. It is fixed.

  A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portion other than the attachment portion 65 is a main body portion 66 (a portion on the folded portion side) that extends from the attachment portion 65 to the front side of the absorber 56 through the side of the absorber 56. The main body portion 66 includes a base side portion 66a that wraps around the front side of the absorbent body 56 toward the center in the width direction, and a tip side portion 66b that is folded back outward in the width direction from the tip of the base side portion 66a. This form is a surface contact type three-dimensional gather 60, but a line contact type three-dimensional gather 60 (not shown) that is not folded outward in the width direction can also be employed. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic elastic member 63 along the front-rear direction is fixed to the free portion 68 in an extended state.

  In the illustrated embodiment, one gathered nonwoven fabric 62 is folded in two to form a laminated structure having an inner nonwoven fabric layer 62a and an outer nonwoven fabric layer 62b from the attachment portion 65 to the body portion 66 of the three-dimensional gather 60. A laminated structure having an inner nonwoven fabric layer 62a and an outer nonwoven fabric layer 62b can also be obtained by laminating a single nonwoven fabric.

  In the free portion 68 of the three-dimensional gather 60, hot melt adhesives and heat seals by various application methods are used to bond the inner nonwoven fabric layer and the outer nonwoven fabric layer of the gather nonwoven fabric 62 and to fix the gather elastic elastic member 63 sandwiched therebetween. Or at least one of fixing means by material welding such as ultrasonic sealing can be used. Moreover, the hot-melt-adhesive which forms the below-mentioned water-impervious layer 64 also functions as this fixing means. Of the free portion 68, the portion without the hot melt adhesive forming the water shielding layer 64 to be described later is coated with the hot melt adhesive only on the outer peripheral surface of the gather elastic elastic member 63 by a coating means such as a comb gun or a shear wrap nozzle. Then, by sandwiching between the inner nonwoven fabric layer and the outer nonwoven fabric layer of the gathered nonwoven fabric 62, the hot melt adhesive applied to the outer peripheral surface of the gathered elastic stretch member 63 can be applied to the inner nonwoven fabric layer and the outer nonwoven fabric layer of the gathered nonwoven fabric 62. The elongated elastic elastic member can be fixed and the inner nonwoven fabric layer and the outer nonwoven fabric layer of the gathered nonwoven fabric 62 can be fixed.

  Further, at least one of hot melt adhesive by various application methods and means by material welding such as heat sealing or ultrasonic sealing can be used for fixing the lying portion 67 to the side surface of the interior body 200. In the illustrated embodiment, the lying portion 67 is fixed by combining hot melt adhesive and material welding means, but these can be fixed only by any one of the means.

The gathered non-woven fabric 62 is made of a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SSMMS, etc.), a melt-blown non-woven fabric with excellent uniformity and concealment, and water-repellent with silicone or the like if necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the gather elastic elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%.

  The number of gather elastic elastic members 63 provided in the free part of the three-dimensional gather 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the gather elastic elastic member 63, it will become easy to contact | abut with respect to skin. The gather elastic elastic member 63 may be disposed not only at the distal end side portion 66b but also at the base side portion 66a, and may be disposed at the attachment portion 65 as shown in FIG. 3 together with or instead of this.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the back side liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 configured in this way, the contraction force of the gather elastic elastic member 63 acts so that both ends in the front-rear direction are brought closer, whereas the both ends in the front-rear direction of the main body portion 66 are fixed so as not to stand up. Since they are non-fixed free parts, the free part 68 stands up so as to come into contact with the body side as shown by a two-dot chain line arrow in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the main body portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Further, in the state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Water shielding layer)
Characteristically, as shown in FIGS. 3, 4 and 9, the three-dimensional gather 60 does not include a waterproof resin film, and extends at least from the inside of the attachment portion 65 to the inside of the main body portion 66. A layer 62b and a water shielding layer 64 made of a hot melt adhesive interposed therebetween are provided. Thus, if the water-proof layer 64 is formed with a hot-melt adhesive without providing a waterproof resin film on the three-dimensional gather 60, and the basic structure is to ensure water shielding, the flexibility of the three-dimensional gather 60 can be improved. Can do.

  Furthermore, in this embodiment, the side edge of the back-side liquid-impermeable sheet 11 is separated from the side edge of the absorber 56 toward the center in the width direction, and the width-direction center side of the water shielding layer 64 on the back side of the absorber 56. These side edges are located closer to the center side in the width direction than the side edges of the back-side liquid-impermeable sheet 11 (can be the same). That is, in this embodiment, in order to ensure the water-blocking property on the back side of the side portion of the absorber 56, the back-side liquid-impermeable sheet 11 does not extend to the side edge of the absorber 56, but the water-blocking of the three-dimensional gather 60 Since the layer 64 is extended to the back side of the side portion of the absorber 56 and the cover range by the back side liquid impermeable sheet 11 is narrowed, the back side liquid impermeable sheet 11 of the back side of the absorber 56 is narrowed. Hardness has no effect. As a result, the fit around the legs can be improved while preventing bleeding.

  In particular, as shown in FIGS. 2 and 3, the gather elastic elastic member 63 is also provided in the attachment portion 65 of the three-dimensional gather 60 so that the side of the absorbent body 56 can be lifted and fitted to the skin side. However, if the mounting portion 65 has a waterproof resin film as in the prior art, the elasticity unique to the waterproof resin film affects the elasticity of the gather elastic elastic member 63. On the other hand, as in the present embodiment, the water shielding layer 64 of the three-dimensional gather 60 is formed by a hot melt adhesive instead of the waterproof resin film, and the portion where the gather elastic elastic member 63 is provided in the attachment portion 65 is the water shielding layer 64. By having a portion that does not overlap with the back-side liquid-impermeable sheet 11, the stretchability of the gather elastic stretchable member 63 is hardly hindered.

  Further, when the gather elastic elastic member 63 is provided on the attachment portion 65 of the three-dimensional gather 60 and the side portion of the absorber 56 is lifted, the side portion of the absorber 56 is placed on the attachment portion 65 of the three-dimensional gather 60 as shown in FIG. It is preferable that the side portions of the absorbent body 56 be lifted easily by the gather elastic elastic member 63. The width 56E of the non-fixed portion can be determined as appropriate, but is preferably about 15 to 55% of the width 56X of the absorber 56. In order to make the side part of the absorber 56 non-fixed to the attachment part 65 of the three-dimensional gather 60, the hot melt adhesive that fixes the packaging sheet 58 to the back side member as shown in the figure is not fixed. In addition to non-application to the part to be applied, the hot melt adhesive that fixes the absorbent body 56 to the packaging sheet 58 on the back side is not applied, or the top sheet 30 is a liquid-impermeable sheet as shown in the figure. In the form of wrapping around the back side, appropriate changes such as non-application of a hot melt adhesive for fixing the backside top sheet 30 to the three-dimensional gather 60 are possible. In short, it is only necessary that the side portion of the absorber 56 is lifted (lifted) from the attachment portion 65 of the three-dimensional gather 60.

The water shielding layer 64 is formed by applying a commonly used hot melt adhesive in layers. The application amount of the hot melt adhesive forming the water shielding layer 64 can be determined as appropriate, but is preferably about ² to ²⁰ g / m ² .

  The hot melt adhesive forming the water shielding layer 64 can be used without particular limitation, such as EVA, adhesive rubber (elastomer), olefin, polyester / polyamide. The present three-dimensional gather 60 does not include a conventionally used white waterproof resin film, and the hot melt adhesive is usually transparent or translucent. Therefore, the color of excrement inside the three-dimensional gather 60 is transparent to the three-dimensional gather 60. It may be easy to see and may cause anxiety about leakage to the user. Therefore, it is also a preferable form to conceal the color of excrement by making the hot melt adhesive forming the water shielding layer 64 colored such as white.

  Although the side edge on the width direction center side of the water shielding layer 64 in the attachment portion 65 is not particularly limited as long as it is located closer to the width direction center side than the side edge of the back side liquid-impermeable sheet 11, It is preferable that the inner nonwoven fabric layer 62a and the outer nonwoven fabric layer 62b are overlapped with each other, as shown in FIG. It is desirable that More specifically, the width of the water shielding layer 64 on the back side of the absorber 56 (the width direction separation distance between the side edge of the water shielding layer 64 in the width direction center side and the side edge of the absorber 56) 64d is 5 to 30 mm. It is preferable to set the degree.

  The water shielding layer 64 can be extended to the tip of the three-dimensional gather 60, but in order to increase the flexibility of the tip of the three-dimensional gather 60, the water-shielding layer 64 may be located farther to the base side than the tip of the three-dimensional gather 60. It is preferable to do. The separation distance 64p may be determined as appropriate, but in the normal case, it is preferably about 1 to 20 mm. Moreover, it is preferable that the side edge at the front end side of the three-dimensional gather 60 of the water shielding layer 64 is located in a range from the first to the second one from the front end side of the three-dimensional gather 60.

  Further, the width-direction separation distance 11d between the side edge of the back-side liquid-impermeable sheet 11 and the side edge of the absorber 56 may be appropriately determined according to the width of the water shielding layer 64 on the back side of the absorber 56. It can be set to about 20 to 90% of the width 64 d of the water shielding layer 64 on the back side of the absorber 56.

  In the case where the three-dimensional gather 60 has a folded-back shape having a tip side portion 66b and a root side portion 66a as shown in the figure, the lying portion 67 is a portion where the height of the three-dimensional gather 60 is not present, but is a portion that comes into contact with the skin. Therefore, flexibility is more important than water shielding. Therefore, as shown in FIGS. 11 and 12, in the front-rear direction range corresponding to the lying portion 67, the water shielding layer 64 is not provided on the distal end side than the portion located on the front side of the absorbent body 56 in the top sheet 30 (front end side). It is also preferable that the flexible portion 67 has a high flexibility while ensuring water shielding properties. On the other hand, the flexibility of the free portion 68 is important, but the water shielding is also important. Therefore, in the front-rear direction range corresponding to the free portion 68, the water shielding layer 64 is attached from the tip side portion 66b through the root side portion 66a. It is desirable to extend into the portion 65.

  In this case, as shown in FIG. 11, the gather elastic elastic member 63 provided in the attachment portion 65 is swung in the width direction so that the front and rear side portions reach the portions without the water shielding layer 64 in the front and rear lying portions 67, respectively. Then, when the front and rear ends of the gather elastic elastic member 63 are cut during manufacturing, not only the gather elastic elastic member 63 provided in the main body portion 66 but also the gather elastic elastic member 63 provided in the attachment portion 65 Can be drawn toward the center in the front-rear direction, and the expansion / contraction range in the front-rear direction can be made shorter than the total length of the three-dimensional gather 60.

  Further, the flexibility of the free portion 68 of the three-dimensional gather 60 is more important toward the tip end side, and the water shielding is very important toward the attachment portion 65 side. Here, when the application amount of the hot melt adhesive is increased, the water impermeability is improved although the flexibility is lowered. Therefore, as shown in FIG. 13, in the free part 68 of the three-dimensional gather 60, the application amount of the hot melt adhesive forming the water shielding layer 64 is stepwise (or continuous) from the attachment part 65 side toward the tip side. However, it is desirable to be reduced. In particular, in the folded configuration having the tip side portion 66b and the root side portion 66a as in the three-dimensional gather 60 of the illustrated embodiment, the application amount of the hot melt adhesive forming the water shielding layer 64 in the tip side portion 66b is the root amount. It is desirable to make it smaller than the application amount of the hot melt adhesive that forms the water shielding layer 64 in the side portion 66a. In addition to or in addition to this, the application amount of the hot melt adhesive forming the water shielding layer 64 in the base portion 66a is larger than the application amount of the hot melt adhesive forming the water shielding layer 64 in the attachment portion 65. It is desirable to reduce the amount. The form shown in FIG. 13 is an example in which the application amount change is applied to the form shown in FIG. 11, but the change in the application amount can also be applied to the form shown in FIG.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  The present invention is suitable for a pants-type disposable diaper as in the above example, but can be used in general absorbent articles such as pad-type disposable diapers and sanitary napkins.

  DESCRIPTION OF SYMBOLS 11 ... Back side liquid impervious sheet, 12 ... Exterior body, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 Gather nonwoven fabric, 62a ... inner nonwoven fabric layer, 62b ... outer nonwoven fabric layer, 66a ... root side portion, 66b ... tip side portion, 63 ... gather elastic elastic member, 65 ... mounting portion, 66 ... main body portion, 67 ... lodging portion, 68 ... Free part, 64 ... Water shielding layer.

Claims (8)

An absorber provided in a region including the crotch portion;
A liquid-permeable top sheet provided on the front side of the absorber;
A back side liquid-impermeable sheet made of a waterproof resin film provided on the back side of the absorber;
The belt-shaped three-dimensional gathers provided on both sides in the width direction and extending in the front-rear direction,
The three-dimensional gather includes an attachment portion fixed to a member on the back side of the side portion of the absorber, a main body portion extending from the attachment portion to the front side of the absorber through the side of the absorber, and front and rear of the main body portion. Of the both ends in the direction and the intermediate portion in the front-rear direction, the lying portion formed by fixing the both ends in the front-rear direction in the lying state, the free portion formed in which the intermediate portion in the front-rear direction is not fixed, and the free portion It has a gather elastic elastic member fixed in an extended state along the front-rear direction at least at the tip.
In absorbent articles,
The three-dimensional gather does not include a waterproof resin film, and includes at least an inner nonwoven fabric layer, an outer nonwoven fabric layer, and a hot melt adhesive interposed between the inner nonwoven fabric layer and the main body portion. Have
The side edge of the back side liquid-impermeable sheet is spaced apart from the side edge of the absorber to the center in the width direction,
The side edge on the width direction center side of the water shielding layer on the back side of the absorbent body is the same as the side edge of the back side liquid-impermeable sheet or located on the width direction center side than that,
An absorbent article characterized by the above.   2. The absorbent article according to claim 1, wherein the three-dimensional gather includes the gather elastic elastic member in a portion of the attachment portion that has the water shielding layer and does not overlap the back side liquid-impermeable sheet.   The absorbent article according to claim 2, wherein a side portion of the absorbent body is not fixed to an attachment portion of the three-dimensional gather. The body part of the three-dimensional gather is composed of a root side part that goes around to the front side of the absorber and toward the center side in the width direction, and a tip side part that is folded back outward in the width direction from the tip of the root side part,
In the front-rear direction range corresponding to the lodging portion, the water shielding layer is not provided at least at the tip side portion and extends from the base side portion to the attachment portion,
In the front-rear direction range corresponding to the free part, the water shielding layer extends from the tip side part through the base side part to the attachment part,
The absorptive article according to any one of claims 1 to 3. The body part of the three-dimensional gather is composed of a root side part that goes around to the front side of the absorber and toward the center side in the width direction, and a tip side part that is folded back outward in the width direction from the tip of the root side part,
In the front-rear direction range corresponding to the free part, the water-blocking layer extends from the tip-side part through the base-side part into the mounting part and forms the water-blocking layer. The absorptive article according to any one of claims 1 to 4, wherein the coating amount is reduced stepwise or continuously from the attachment portion side toward the tip side.   The absorbent article according to any one of claims 1 to 5, wherein the hot melt adhesive forming the water shielding layer is colored. The lodging portion has a portion without the water shielding layer over the entire longitudinal direction thereof,
The gather elastic elastic member provided in the attachment portion has a portion extending in the front-rear direction passing through the attachment portion in a front-rear direction range corresponding to the front and rear lying portions, and both front and rear portions thereof are front and rear. The absorbent article according to claim 2 or 3, wherein the absorbent article is attached so as to reach a portion without a water shielding layer of the lodging portion. The side seal part is formed by joining the both sides of the outer body that forms the front body extending from the crotch to the ventral side and the both sides of the outer body that forms the back body extending from the crotch to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
An interior body that includes the liquid-permeable top sheet, the back-side liquid-impermeable sheet, and the absorber interposed therebetween, and covers from the back side to the abdomen through the crotch, Attached inside,
The three-dimensional gather is a pants-type disposable diaper provided on both sides of the interior body,
The absorptive article according to any one of claims 1 to 7.