JP2017042391A5 - - Google Patents

Description

Pants-type disposable diaper

  The present invention relates to a pants-type disposable diaper.

  The pants-type disposable diaper includes an exterior body that individually or integrally forms a front body and a back body, and an interior body that includes an absorbent body that is attached to the inner surface of the exterior body so as to extend from the front body to the back body. A waist opening and a pair of left and right leg openings are formed by joining the side edge portions of the outer body of the front body and the side edges of the outer body of the rear body to form a side seal portion. Is common. As the absorber, a fiber assembly made of cotton pulp or the like and having a superabsorbent polymer (SAP) held therein is used.

  In such a pants-type disposable diaper, in order to improve fit to the body, the exterior body has a laminated structure having a plurality of sheet layers, and various elastic elastic members are attached in an expanded state between the sheet layers. In particular, an elongated waistline elasticity along the width direction in the waistline region defined as the front-rear range corresponding to the side seal part and the middle region of the diaper located between the front and back waistline regions The form in which the elastic members are attached in a state where they are extended in the width direction with an interval in the front-rear direction is fixed as a basic form (see, for example, Patent Document 1).

  In addition, in order to secure the fit around the legs and prevent so-called side leakage, it is also established to provide a three-dimensional gather that rises from both sides in the width direction of the interior body. Similarly, in order to ensure the fit around the legs, the crotch side is curved from one side seal part along the circumference of one leg with respect to the integral exterior body continuous from the front to the back. It is also widely used to provide an elongated leg-hole elastic elastic member (see, for example, Patent Document 1) extending in the crotch portion and extending in a curved line along the circumference of the other leg to the other side seal part. .

  As described above, the pants-type disposable diaper is secured by various elastic elastic members, and as a result, a good state is ensured at least in a state before being absorbed.

  However, conventional pants-type disposable diapers have room for improvement in the fit and wearing feeling of the crotch part after absorption of a large amount (for example, 200 cc or more), such as when urinating multiple times.

  That is, the excreted urine is absorbed by the absorber while spreading to a certain extent around the crotch. In the absorption range of urine in the absorbent body, the superabsorbent polymer swells by absorption of urine to become a gel (jelly), and when absorbed to a certain extent, the part is formed by a part of the superabsorbent polymer gel (hereinafter referred to as “the gel”). (Also referred to as a gelled portion). If the state in which the absorption is averaged in each part of the absorber in a state of a diaper alone is considered statically, the thickness of each part of the absorber increases according to the amount of absorption even after a large amount of absorption, and as a whole Just by inflating, the fit of the crotch part and the feeling of wearing cannot be further increased even if deterioration of the swelling of the absorbent body is inevitable. However, if you wear a diaper on the human body and absorb a large amount of urine and leave it on for a certain period of time (this kind of usage may occur frequently in infants), urine tends to concentrate on the crotch. As a result, the crotch portion swells intensively and a large lump of gelled portion is easily formed. Further, since the gelled portion is easily deformed and moved, it tends to concentrate on the crotch portion and become a large lump due to the movement of the legs and its own weight due to walking. In any case, the large mass of the gelled part formed in the crotch part is sandwiched between both legs, but the width becomes narrow, but it deforms extremely long downward, and the diaper crotch part becomes narrow due to the influence. The shape protrudes downward (hangs down). In this state where the crotch part droops greatly, the leg opening position descends while moving to the center in the width direction, and even if there is a three-dimensional gather, the base position moves down while moving to the center in the width direction. Not only does the feeling worsen, but a gap is likely to occur between the legs of the wearer and the diaper. Moreover, when the superabsorbent polymer gel is heavy and becomes a large lump, the shape is difficult to return.

  Conventionally, a technique for providing a plurality of elongate pulling elastic elastic members along the front-rear direction on the back side of the interior body at intervals in the width direction as one that seems to solve such a hang of the crotch part (for example, Patent Documents 1 to 5) See).

  However, in the pulling elastic stretchable member along the front-rear direction, the contraction force acting on the crotch part is mainly composed of the front-rear direction component and almost no width-direction component. There is almost no force against compression deformation, and after the large amount of absorption, the above-mentioned drooping state is likely to occur. And when it is in a drooping state, there is almost no shrinkage force component in the width direction, and the mass of the heavy and large gelled portion is difficult to return to its original shape, so it is almost impossible to push back and expand, so after mass absorption Insufficient sagging effect. Of course, it may be possible to expect a certain level of effect if the elastic stretchable members extending along the front-rear direction are densely provided over the entire width direction. In that case, however, the cost increases and there are many grooves (ridges) along the front-rear direction. Deterioration of appearance and wearing feeling due to formation is inevitable.

  In addition, when focusing on the width direction component of the contraction force, it seems that a certain degree of effect can be expected even with the elastic elastic members around the legs provided in the above-mentioned exterior body. The contraction force that acts on the part that does not have the effect of preventing the movement concentration and deformation of the gelled part and the force to return the hanging state to the original state, and the elastic elastic members around the legs move the crotch part in the width direction Even if the contraction force in the width direction acts on the passing portion, the pulling force in the front-rear direction does not act on that portion, so in any case, the drooping prevention effect is hardly exhibited. In this respect, the ones described in Patent Documents 1 to 5 are combined with the elastic stretchable members along the front-rear direction, and thus it is considered that the effect of preventing drooping is better than that of any single form, but a drooping state is formed. Considering the principle, it cannot be said that it is an effective improvement measure, and it is not preferable in that it has a large number of elastic elastic members and a complicated structure.

JP 2003-19163 A JP 2007-185329 A JP 2011-206216 A JP 2004-350809 A JP 2007-061335 A

  Therefore, a main problem of the present invention is to effectively prevent the crotch part from sagging after a large amount of absorption, and to improve the fit, wearing feeling, and appearance of the crotch part after the large amount of absorption.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior body that individually or integrally configures the front and back bodies; and
An interior body including an absorbent body attached to the intermediate portion in the width direction of the exterior body so as to extend from the front body to the back body,
The absorbent body is formed by holding a superabsorbent polymer in a fiber assembly,
By forming both side portions of the front body exterior body and both side portions of the rear body exterior body to form side seal portions, a waist opening and a pair of left and right leg openings are formed,
The exterior body is a waistline expansion / contraction region that elastically expands and contracts in the width direction at least on both sides in the width direction of the interior body fixing region to which the interior body is fixed, of the waistline region corresponding to the side seal portion. have,
In pants-type disposable diapers;
The interior body has a front waistline fit region and a back waistline fit region respectively corresponding to the waistline stretchable region of the front body and the waistline stretchable region of the back body in the front-rear direction,
From the left end of the front waistline fit region to the right side end of the rear waistline fit region, the rear waist is gradually positioned on the right side, and from the right end of the front waistline fit region to the rear gradually extend respectively so as to be positioned on the left side, and a pair of elongated obliquely intersecting with one of the intersection of the widthwise middle portion of the crotch portion together toward the rear side to the left side end portion of the waist-fit region The cross elastic elastic member is fixed to the back side of the absorbent body in the interior body in a state of extending in the extending direction,
The pair of diagonally crossing elastic elastic members has a crossing angle in the front-rear direction at the intersection of 45 to 90 degrees, and the front and rear sides from the intersection between the front waistline fit region and the back waistline fit region. Extending so that the acute angle crossing angle with respect to the front-rear direction decreases respectively toward
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, since the diagonally elastic elastic member is basically provided in the interior body, the structure is directly applied to the absorber incorporated in the interior body as compared with the form in which the elastic body around the leg is provided in the exterior body. The pulling force acts on the crotch portion, and therefore, it is excellent in the effect of preventing the crotch portion from sagging. And the diagonally crossing elastic stretch members are arranged substantially crossing the X shape, are substantially connected to the waistline stretch region, and the crossing angle in the front-rear direction at the intersection is 45 to 90 degrees, Between the front waistline fit region and the rear waistline fit region, when extending so that the acute angle crossing angle with respect to the front-rear direction decreases from the intersection toward the front side and the rear side, the contraction force toward the diagonally upper left and the diagonal The shrinking force toward the upper right acts in a well-balanced manner over the wide area of the absorbent body, supporting the part firmly pressed against the body by the waist expansion / contraction region, the crotch part is difficult to compress in the width direction, and the pulling force is fully demonstrated Is done. As a result, the movement concentration of the gelled part and the deformation to the sagging state are alleviated, and the sagging of the crotch part after a large amount of absorption can be effectively prevented. Will improve. Moreover, as is apparent from the examples described later, the grooves formed by the contraction of the diagonally crossing elastic elastic members are not conspicuous and the appearance is good.

<Invention of Claim 2>
The outer body does not have leg elastic elastic members extending along the leg openings, and the inner body does not have a pulling elastic elastic member extending in the front-rear direction without crossing each other. Item 1. A pants-type disposable diaper according to item 1.

(Function and effect)
In the present invention, it is possible to sufficiently achieve both the prevention of the groin portion from sagging and the good appearance without providing these conventionally used elastic elastic members.

<Invention of Claim 3>
The front exterior body constituting the front body and the rear exterior body constituting the rear body are individually provided as the exterior body, and the front exterior body and the rear exterior body are separated in the front-rear direction. A pants-type disposable diaper according to 1 or 2.

(Function and effect)
Such an exterior two-part type has the advantage that it is not necessary to punch a leg opening for passing a leg, or a small area is required even if punched. That is, since the separation piece (hereinafter also referred to as trim) is discarded, the material loss (hereinafter also referred to as trim loss) can be suppressed. For this reason, it is often used in low-cost products. However, such a two-split exterior type tends to cause the crotch part to hang down. In addition, when an elastic stretchable member is provided in the crotch part, it is impossible in principle to provide the crotch part. Therefore, the present invention is suitable for such a two-split exterior type.

<Invention of Claim 4>
The underpants type disposable diaper of any one of Claims 1-3 in which the penetration part penetrated in the thickness direction is formed in the site | part which overlaps with the intersection of the said diagonal crossing elastic elastic member in the said absorber.

(Function and effect)
Since the contraction force concentrates at the intersections of the diagonally crossing elastic stretchable members, the absorbent body tends to collapse at the corresponding part. Therefore, it is one preferable form to prevent the absorber from collapsing by providing the penetrating portion in advance.

<Invention of Claim 5>
The diagonally crossing elastic elastic member extends from the rear end portion of the front waistline fit region to the front side and from the front end portion of the rear waistline fit region to the rear side, and at least the rear end portion of the front waistline fit region. And at the front end of the rear waistline fit region, it is fixed to the interior body, and at least at the front side from the rear end of the front waistline fit region and at the rear side from the front end of the rear waistline fit region, The pants-type disposable diaper according to any one of claims 1 to 4, which is not fixed.

(Function and effect)
Since the interior body is generally assembled in a posture in which the front-rear direction is along the MD direction (machine direction, flow direction) of the production line, it is desirable that the oblique cross elastic stretchable member is continuous in the front-rear direction of the interior body during manufacture. However, when the diagonally crossing elastic stretchable member is continuously fixed to the interior body in such a production form, the contraction force acts on the entire front-rear direction of the portion having the interior body, and wrinkles along the lateral direction are generated. Such a recumbency not only deteriorates the appearance, but particularly when a recumbent occurs in a portion that is pressed more firmly against the skin than the crotch region due to the stretchable region around the waist, the feeling of wearing deteriorates. In addition, the recumbency inhibits the diffusibility of the urine in the front-rear direction and promotes the diffusion in the width direction. Therefore, the recumbent is not preferable from the viewpoint of effectively using the entire absorber and preventing so-called side leakage. Therefore, as described in this section, the diagonally crossing elastic elastic member is not fixed to the interior body at the front side from the rear end portion of the front waistline fit region and the rear side from the front end portion of the rear waistline fit region, and contracts to the range. It is desirable to prevent the occurrence of various problems due to lying down by preventing the force from acting.

<Invention of Claim 6>
The trunk periphery stretchable region in the exterior body extends to both ends in the width direction of the interior body fixing region,
A fixed portion of the diagonally crossing elastic stretchable member with respect to the interior body is extended to at least a portion overlapping the waistline stretchable region at both ends in the width direction of the interior body securing region;
The underpants type disposable diaper of any one of Claims 1-5.

(Function and effect)
When configured as described in this section, the stretchable portion by the diagonally crossing elastic stretchable member and the waistline stretchable region continuously form an integral stretchable portion, so that the effect of the present invention is further improved. It will be a thing.

<Invention of Claim 7>
Both side portions of the interior body are interior body non-fixed areas on the exterior body, and the interior body fixing area is provided between these interior body non-fixed areas,
The diagonally crossing elastic elastic member extends from the rear end portion of the front waistline fit region to the front side and from the front end portion of the rear waistline fit region to the rear side, and at least the rear end portion of the front waistline fit region. The front side and the rear side from the front end portion of the rear waistline fit region are extended in the front-rear direction through the interior body non-fixed region,
The underpants type disposable diaper of any one of Claims 1-6.

(Function and effect)
As described above, the interior body non-fixed region is provided on the front side from the rear end portion of the front waistline fit region and the rear side from the front end portion of the rear waistline fit region without providing the interior body fixing regions on both sides of the interior body. By passing the diagonally crossed elastic elastic member through, the contraction force by the diagonally crossed elastic elastic member directly acts only on the interior body and does not act on the exterior body, so that adverse effects on the exterior body can be prevented. . In particular, even in the case where the stretchable region and the waistline stretchable region by the diagonally crossing elastic stretchable member overlap at this part, the two stretch substantially independently from each other while forming a substantially stretched integral stretched part. Therefore, it is possible to effectively prevent the appearance and the wearing feeling from deteriorating.

  As described above, according to the present invention, it is possible to effectively prevent the groin from sagging after a large amount of absorption, and to improve the fit, wearing feeling, and appearance of the groin after a large amount of absorption. Is brought about.

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. (A) 5-5 sectional drawing of FIG. 1, (b) 6-6 sectional drawing of FIG. It is a perspective view from the diagonally left front supposing the wearing state of a pants type disposable diaper. It is the perspective view from the front diagonally lower supposing the wearing state 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. 5 is a cross-sectional view corresponding to a 5-5 cross section of FIG. 1. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. (A) Sectional drawing equivalent to 5-5 section of FIG. 1, (b) Sectional drawing equivalent to 6-6 section of FIG. FIG. 5 is a cross-sectional view corresponding to a 5-5 cross section of FIG. 1. It is a top view in the state where the diaper was developed showing the outer surface 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. It is a top view in the state where the diaper was developed showing the outer surface 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. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a photograph of the test result of (a) Example 1 and (b) Example 2. (A) Comparative example 1, (b) Comparative example 2, (c) Comparative example 3, and (d) Photographs of test results of conventional examples.

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 the present embodiment extends from the front exterior body 12F constituting the front body F and the rear exterior body 12B constituting the rear body B and from the front exterior body 12F to the rear exterior body 12B through the crotch part. The exterior body 12F and 12B are provided inside the exterior body 12F, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portion 12A. By being formed, the opening formed by the front and rear end portions of the exterior bodies 12F and 12B becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the exterior bodies 12F and 12B and the interior are formed on both sides in the width direction of the interior body 200. The portions surrounded by the side edges of the body 200 are leg openings LO through which the legs pass. 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. The symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction 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 the symbol X indicates the diaper in the deployed state. The full width of is shown.

  Moreover, the pants-type disposable diaper 100 of this embodiment forms a waist region T defined as a front-rear direction range (a front-rear direction 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. A diaper intermediate region L determined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction 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 front-rear 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 diaper intermediate region L are bounded in a U-shape or a curved shape so as to follow the circumference of the wearer's leg, 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.

(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 liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, 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. Shows a three-dimensional gather 60 that rises from 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.

(Interior body fixing area)
The interior body 200 can be fixed to the exterior bodies 12F and 12B by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the inner surface 200 is fixed to the inner surface of the exterior body 12 by a hot melt adhesive applied to the rear surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the attachment portion 65 of the three-dimensional gather 60. Yes. The interior body fixing region 201 for fixing the interior body 200 and the exterior bodies 12F and 12B can be provided in almost the entire region where both overlap, and is usually provided in a portion excluding both ends in the width direction of the interior body 200. It is preferable that both side portions of the interior body 200 be interior body non-fixed regions 202 that are not fixed to the exterior body 12.

(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.

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

  For the purpose of preventing displacement of the top sheet 30 with respect to the back side member, the top sheet 30 is preferably 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 hot melt adhesive. . 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 absorbent body 56 by a hot melt adhesive 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 preferably 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 hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. . In the illustrated embodiment, 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 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the 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 provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the 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 fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a 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 liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 to form the side surface of the top sheet 30 of the absorbent element 50. It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

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

(Three-dimensional gather)
The three-dimensional gather 60 has a portion that rises from both sides in the width direction between the front and rear end portions of the interior body, in order to block excrement that travels in the lateral direction along the top sheet 30 and prevents side leakage. It is provided. The three-dimensional gather 60 of the present embodiment is provided so as to rise from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the middle portion in the width direction. It stands up diagonally toward the outside.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated gather elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. 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. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (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 protrusion parts 66 are used as the front-back fixing | fixed part 67 fixed with respect to the side surface of the top sheet 30 in the lying state, the front-back direction intermediate part located between these is not A gathering elastic member 63 extending in the front-rear direction is fixed to the free part 68 in an extended state.

  In the free portion 68 of the three-dimensional gather 60, hot melt adhesives and heat seals and super seals by various coating methods are used to bond the inner layer and the outer layer of the gather sheet 62 and to fix the gather elastic elastic member 63 sandwiched therebetween. At least one of fixing means by material welding such as a sonic seal can be used. Since the flexibility is lost when the entire inner layer and outer layer of the gather sheet 62 are bonded together, it is preferable that the portions other than the bonding portion of the gather elastic elastic member 63 are not bonded or weakly bonded. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic stretchable member 63 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner layer and the outer layer of the gather sheet 62, thereby collecting the gather elastic stretch. A structure in which the elongated elastic elastic member is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the member 63. It has become.

  Also, hot melt adhesives and heat seals by various application methods are used for fixing the waterproof film 64 and the gather sheet 62 incorporated in the three-dimensional gather 60 and fixing the front and rear fixing portion 67 to the side surface of the interior body 200. Or at least one of means by material welding such as ultrasonic sealing can be used. In the illustrated embodiment, slot application of hot melt adhesive is used for fixing the waterproof film 64. Further, in the illustrated embodiment, the front and rear fixing 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 gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric excellent in uniformity and concealment, and water-repellent with silicone as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread 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 term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  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 liquid-impermeable sheet 11, the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown 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, but in the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding 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.

(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.

  The absorber 56 may have a rectangular shape, but as shown in FIGS. 1 and 2, if the hourglass shape has a narrow constricted portion at the crotch portion, the legs of the absorber 56 itself and the three-dimensional gather 60 are formed. It is preferable because the fit to the surroundings is improved.

  Moreover, the dimension of the absorber 56 can be determined as long as it is provided so as to cover the crotch part, but preferably extends to the peripheral part of the interior body or the vicinity thereof in the front-rear direction and the width direction. Reference numeral 56X indicates the entire width of the absorber 56, and reference numeral 56Y indicates the entire length of the absorber 56.

(Superabsorbent polymer particles)
As the absorbent body 56, a fiber assembly in which a superabsorbent polymer is held is used. In a general absorbent body, the superabsorbent polymer particles are held in the fiber gap of the fiber assembly so as to be movable, but may be fixed. 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.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

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 be adjusted in distribution density or distribution amount in the planar direction of the absorber 56. For example, the distribution amount of the liquid excretion site can be made larger than that of other sites. When gender differences are taken into account, men can increase the distribution density (amount) on the front side, and women can increase the distribution density (amount) in the center. 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.

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are separated in the front-rear direction. This separation distance 12d can be about 150 to 250 mm. A part of the exposed portion of the back surface of the interior body 200 in the separated portion (for example, the entire portion in the front-rear direction of the portion exposed between the front exterior body 12F and the rear exterior body 12B, but does not extend to the front and rear ends of the interior body 200. In addition, it is desirable that the crotch portion cover sheet 12M made of a nonwoven fabric or the like is attached so as to cover the entire side of the interior body 200 so that both side edges in the width direction do not reach the both side edges of the interior body 200, but may be omitted.

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In the present embodiment, the front exterior body 12F does not have a portion corresponding to the diaper intermediate region L, but the rear exterior body 12B extends from the waistline region T to the diaper intermediate region L side. have. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T to the diaper intermediate region L side, or has a groin cover portion but no collar cover portion, or the front exterior body 12F. And the part corresponding to the diaper intermediate | middle area | region L does not need to be provided in both the back side exterior body 12B. Further, in the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line shape along the width direction, similarly to the lower edge of the front exterior body 12F, but is positioned on the waist opening side toward the outer side in the width direction. It can also be a curve that becomes

  As shown in FIGS. 3 to 5, the exterior bodies 12 </ b> F and 12 </ b> B are formed by joining the outer sheet layer 12 </ b> S and the inner sheet layer 12 </ b> H by a joining means such as a hot melt adhesive or welding. The sheet material for forming the outer sheet layer 12S and the sheet material for forming the inner sheet layer 12H are individual sheet materials as shown in FIGS. 5 and 11, and are common as shown in FIG. A single sheet material can also be used. That is, in the latter case, the inner sheet layer 12H and the outer sheet layer 12S are respectively formed by the inner portion and the outer portion of one sheet material folded at the crotch side edge. In the former form, since there are few sheet material folding steps, there is an advantage that the inner sheet layer 12H and the outer sheet layer 12S are not easily displaced, and in the latter form, the number of sheet materials is small. There is.

  If the ends of the sheet material forming the outer sheet layer 12S and the inner sheet layer 12H and the front and rear ends of the interior body 200 are exposed to the waist opening WO, the corners of the sheet material may hit the skin and the touch may be deteriorated. There is a possibility that the partial elastic elastic member 17 and the hot melt adhesive for fixing the elastic elastic member 17 may be exposed. Therefore, as shown in FIGS. 5, 9, and 11, the sheet material forming the outer sheet layer 12 </ b> S is wrapped around the waist side edge of the sheet material forming the inner sheet layer 12 </ b> H. It is preferable to form a waist-side folded portion and extend the waist-side folded portion 12r to the end of the interior body 200 on the waist side. Although not shown, both the sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H are folded inward at the waist side edge, and the folded portion 12r is the end portion on the waist side of the interior body 200. It may extend to the top.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation as long as it is a thermoplastic resin non-woven fabric. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, polyamides, etc. A mixed fiber, a composite fiber, or the like in which two or more of these are used can be used. 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 .

Moreover, it is preferable that the total weight of the exterior bodies 12F and 12B is about 20 to 60 g / m ² .

  And in the exterior bodies 12F and 12B, in order to improve the fit property with respect to the wearer's waist, an elongated elastic elastic member 15 such as a rubber thread is provided in the waist area T between the outer sheet layer 12S and the inner sheet layer 12H. To 19 are fixed at a predetermined elongation rate in the width direction, and a waist-around stretch region 12X (region having elongated elastic stretch members 15 to 19) that elastically stretches in the width direction is formed. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched between them, hot melt adhesives and heat seals by various coating methods are used. At least one of fixing means by material welding such as an ultrasonic seal can be used. Since the flexibility is lost when the entire exterior bodies 12F and 12B are firmly fixed, it is preferable that the portions other than the adhesive portions of the elongated elastic elastic members 15 to 19 are not adhered or weakly adhered. 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 outer sheet layer 12S and the inner sheet layer 12H in the waist part W of the exterior bodies 12F and 12B, a plurality of waist elastic elastic members 17 are vertically spaced so as to be continuous over the entire width direction. And is fixed in a state of being stretched along the width direction at a predetermined stretch rate. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic elastic members 17, you may overlap with the interior body 200 or the width direction which overlaps with the interior body 200 You may each provide in the width direction both sides except a center part. As the waist resilient and elastic members 17, the thickness 155～1880Dtex, particularly about 470～1240Dtex (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 to 1 the rubber thread .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 elastic elastic member 17 does not need to have the same thickness and elongation rate. For example, the thickness and elongation rate of the elastic elastic member may be different between the upper portion and the lower portion of the waist portion W.

  In addition, a plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower part U of the exterior bodies 12F and 12B. And is fixed in a state of being stretched along the width direction at a predetermined stretch 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, a plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover part 14 of the rear exterior body 12B. And it is being fixed in the state extended | stretched along the width direction with the predetermined expansion | extension rate.

The cover elastic elastic member 16 has 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 to 1. It is preferable to fix the thread rubber of about 0 mm ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and stretch ratios of 150 to 300%, particularly 180 to 260%, respectively.

  In the case where an inguinal cover is provided on the front exterior body 12F, a cover elastic member can be provided in the same manner.

(Display sheet)
A display sheet 25 having a display of a character or the like can be interposed at a position overlapping the non-stretchable region A1 in at least one of the front exterior body 12F and the rear exterior body 12B. The position at which the display sheet 25 is interposed is not particularly limited as long as the display of the display sheet 25 can be seen through. The display sheet 25 is arranged adjacent to the inside of the outer sheet layer 12S as shown in the drawing, and the outside of the inner sheet layer 12H. It is also possible to dispose them adjacent to each other, to be interposed between the exterior body 12 and the interior body 200, or to be provided in the interior body 200.

  The display added to the display sheet 25 is not particularly limited, and functions such as patterns for decoration (including pictures and one-point characters), usage and assistance, size, etc., manufacturer, product name, and characteristic A display such as a mark display of a function or the like can be added by printing or the like.

(Non-stretchable area)
When the elastic elastic members 15, 16, and 19 are provided in the front-rear direction range having the absorbent body 56, such as the waist lower part U and the buttock cover part 14 in the illustrated form, the width of the absorbent body 56 in part or all thereof. In order to prevent the shrinkage in the direction, the intermediate in the width direction (preferably including the entire interior body fixing region 201) including part or all of the portion overlapping the absorbent body 56 in the width direction is defined as the non-stretchable region A1, and its width It is preferable that both sides in the direction be the stretchable region A2 over the entire width direction. Although not shown, some or all of the elastic elastic members 15, 16, 19 provided in the front-rear direction range having the absorber 56 are continuous in the width direction, and the entire width direction is set as an expansion / contraction region in the continuous portion, and the non-expandable It can also be set as the form which does not provide an area | region.

  The stretchable region A2 and the non-stretchable region A1 supply elastic stretchable members 15-17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and position the elastic stretchable members 15, 16, 19 in the stretchable region A2. After fixing only the portion to be stretched with hot melt adhesive, the elastic stretchable members 15, 16 and 19 are cut by pressing and heating at one place in the middle of the width direction in the region to be the non-stretchable region A1, or elastic stretch It can be constructed by cutting almost the entire members 15, 16, 19 by pressurization and heating and killing the stretchability in the non-stretchable region A1 while leaving the stretchable region A2. In the former case, only the remaining cutting portion continuous from the elastic elastic members 15, 16, and 19 in the elastic region A2 remains as the unnecessary elastic elastic member 18, and in the latter case, the elastic elastic members 15, 16, and 19 in the elastic region A2. The remaining cut portion that is continuous with the elastic elastic members 15, 16, and 19 in both the elastic regions A <b> 2 and a large number of pieces of elastic elastic members that are not continuous with the elastic elastic members 15, 16, and 19 remain as unnecessary elastic elastic members 18. Of course, it is also possible to provide an elastic stretchable member only in the stretchable region A2.

(Slant cross elastic elastic member)
Characteristically, the interior body 200 includes a front waistline fit region 210 and a back waistline fit region 211 respectively corresponding to the waistline stretchable region 12X of the front body F and the waistline stretchable region 12X of the back body B in the front-rear direction. Have. Further, on the back side of the absorbent body 56 in the interior body 200, so as to be gradually positioned on the right side from the left end portion of the front waistline fit region 210 to the right end portion of the rear waistline fit region 211 and toward the rear side, and From the right end of the front waistline fit region 210 to the left side end of the rear waistline fit region 211, each gradually extends to the left as it goes to the rear side, and the crotch portion in the center in the width direction. a pair of elongated oblique cross resilient and elastic members 70 intersect at one of the intersection points, are fixed in an extended state in its extending direction. In addition, the oblique cross elastic elastic member 70 has a front-rear direction crossing angle β at the intersection of 45 to 90 degrees (preferably 60 to 80 degrees), and a front waistline fit region 210 and a back waistline fit region 211. Between the crossing points, the acute side crossing angle α with respect to the front-rear direction decreases from the intersection point toward the front side and the rear side (that is, gradually decreases from a half angle of the crossing angle β). The acute angle crossing angle α is not particularly limited as long as the diagonally crossing elastic elastic member 70 is arranged as described above, but the minimum value is preferably 0 (illustrated form) to 25 degrees, particularly preferably 0 to 10 degrees. Note that. These angles mean angles formed by tangents when the diagonally crossing elastic elastic member 70 is curved. When measuring the angle, the side seal part 12A of the pants-type disposable diaper is peeled off on both the left and right sides, the portions contracted by the elastic elastic members 15 to 19 of the exterior bodies 12F and 12B are cut out, and the left and right three-dimensional gathers 60 in the interior body 200 are removed. After excision, place it on a flat table so that the top sheet 30 faces downward, and in the natural length state, draw an auxiliary line or tangent line in the front-rear direction passing through the apex of the corner of the measurement object with an oil pen as necessary. Measure visually using a protractor.

The oblique cross elastic elastic member 70 has a thickness of 310 to 940 dtex, particularly about 470 to 620 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 1. It is preferable to fix the thread rubber of about 0 mm < ² > at 1 to 4, particularly 1 to 2 with respect to one diagonal direction at an elongation of 200 to 300%, particularly 250 to 300%. When providing a plurality, it is preferable not to bundle them but to provide them with an interval of 1 to 15 mm, particularly 5 to 10 mm.

  As long as the diagonally crossing elastic elastic member 70 is fixed to the back side of the absorbent body 56 in the interior body 200 in a state of extending in the extending direction, the position in the thickness direction is not particularly limited, and the absorbent body 56 and the packaging sheet 58 are not limited. A plurality of sheets laminated between the packaging sheet 58 and the liquid-impermeable sheet 11, between the liquid-impermeable sheet 11 and the crotch cover sheet 12M, or on the back side of the liquid-impermeable sheet 11 (not shown). It can arrange | position between the sheets laminated | stacked by the back side rather than the absorber 56, such as between. Further, the fixing of the diagonally crossing elastic elastic member 70 is not particularly limited, but the diagonally crossing elastic elastic member 70 needs to be attached in an oblique direction. , 12M are preferably fixed by a hot melt adhesive 12G applied to at least one of the sheets.

  The portion extending obliquely from the intersection point in the diagonally crossing elastic elastic member 70 is preferably curved so as to swell outward in the width direction as shown in the figure, but can also be linear.

  The intersection of the diagonally crossing elastic elastic members 70 may be located at the crotch portion, but is preferably a position between the male urination position and the female urination position in the front-rear direction, that is, a position slightly ahead of the center in the front-rear direction. . Further, it is more preferable that the intersection of the diagonally intersecting elastic elastic members 70 is located within the front-rear direction range of the constricted portion of the absorber 56. On the other hand, the left and right ends of the front waistline fit region 210 of the diagonally crossing elastic elastic member 70 are positioned on the front side of the constricted portion of the absorber 56, and the left and right ends of the rear waistline fitting region 211 of the diagonally crossing elastic elastic member 70 are It is preferable that the absorber 56 is positioned on the rear side of the constricted portion.

  In the pants-type disposable diaper configured as described above, the diagonal cross elastic elastic member 70 is basically provided in the interior body 200. The pulling force acts directly on the absorbent body 56 built in the body 200, and thus the crotch portion is excellent in preventing drooping. The diagonally crossing elastic stretchable member 70 has a substantially X-shaped crossing arrangement and is substantially connected to the waistline stretchable region 12X. Further, the crossing angle β in the front-rear direction at the intersection is 45 to 90 degrees. In addition, between the front waistline fit region 210 and the back waistline fit region 211, when extending so that the acute angle crossing angle α with respect to the front-rear direction decreases from the intersection toward the front side and the rear side, The shrinking force toward the upper right and the shrinking force toward the upper right obliquely acts on the absorbent body 56 in a well-balanced manner, with the portion firmly pressed against the body by the waist elastic region 12X, and the crotch portion is less likely to be compressed in the width direction. In addition, the pulling force is fully demonstrated. As a result, the movement concentration of the gelled part and the deformation to the sagging state are alleviated, and the sagging of the crotch part after a large amount of absorption can be effectively prevented. Will improve. Moreover, as is apparent from the examples described later, the grooves formed by the contraction of the diagonally crossing elastic elastic member 70 are not conspicuous and the appearance is good.

  In particular, as shown in the drawing, the waist elastic region 12X of the outer body 12 extends to both ends in the width direction of the inner body 200 fixing region, and the fixing portion 71 of the diagonally crossing elastic elastic member 70 with respect to the inner body 200 is provided. When extending to at least a portion overlapping the waistline stretchable region 12X at both ends in the width direction of the interior body fixing region 201, the stretchable portion by the diagonally crossing elastic stretchable member 70 and the waistline stretchable region 12X are continuously integrated. In order to form a typical stretchable part, the above-mentioned drooping prevention effect is further enhanced.

  Further, the diagonal cross elastic elastic member 70 extends from the intersection to the front side and reaches the left and right ends in the front waistline fit region 210, and the diagonal cross elastic elastic member 70 extends from the intersection to the rear side and the rear waistline. The position in the front-rear direction reaching the left and right ends in the fit region 211 can be determined as appropriate. As shown in the figure, the oblique cross elastic elastic member 70 reaches the left and right end portions of the interior body 200 at the rear end portion in the front waistline fit region 210 and at the front end portion in the rear waistline fit region 211, respectively. Although it is one preferable form, it is the form which reaches the right-and-left end part of the interior body 200 at the front side from the rear end part of the front waistline fit area 210 and the rear side from the front end part of the back waistline fit area 211, respectively. It is also possible to do.

  When the diagonally crossing elastic elastic member 70 is viewed from the intersection, the front side of the front waistline fit region 210 is closer to the left and right ends, and the rear side of the rear waistline fit region 211 is closer to the left and right ends. In this case, the diagonally crossing elastic elastic member 70 may or may not extend. In the former case, a portion of the diagonally crossing elastic elastic member 70 that extends to the front side from the position reaching the left and right ends in the front waistline fit region 210 and a position that is behind the position to reach the left and right ends in the rear waistline fit region 211. The portion extending to the side preferably extends along the front-rear direction as shown in the drawing, but may extend in a curved shape or a straight shape outward or in the width direction.

  As shown in FIG. 12, the diagonally crossing elastic elastic member 70 can be fixed to the interior body 200 over the entire extending direction, but at least the positions reaching the left and right end portions in the front waistline fit region 210. As long as the fixed portion 71 is fixed to the interior body 200 from the position up to the left and right end portions in the rear waistline fit region 211, the other portion 72 is not fixed, and the stretch force does not act. You can also For example, as shown in FIGS. 3, 4, and 8, the diagonally crossing elastic elastic member 70 extends to the front side from the rear end portion of the front waistline fit region 210 and to the rear side from the front end portion of the rear waistline fit region 211. If present, the diagonally crossing elastic elastic member 70 is a fixed portion 71 fixed to the interior body 200 at least at the rear end of the front waistline fit region 210 and at the front end of the rear waistline fit region 211, and at least the front It is one preferable form that the non-fixed portion 72 is not fixed to the interior body 200 on the front side from the rear end portion of the waistline fit region 210 and on the rear side from the front end portion of the rear waistline fit region 211. According to this embodiment, it is possible to prevent undesired recumbency from occurring in the front waistline fit region 210 and the back waistline fit region 211 that are connected to the waistline stretchable region 12X.

  Further, as shown in FIGS. 2 and 4, the inner side body 200 is not set as the inner body fixing area 201, but the inner body non-fixing area 202 is fixed to the outer body 12, and the oblique cross elastic elastic member 70 is provided. When extending from the rear end portion of the front waistline fit region 210 to the front side and from the front end portion of the rear waistline fit region 211 to the rear side, the oblique cross elastic elastic member 70 is at least the rear end of the front waistline fit region 210. It is also a preferred embodiment that the front side of the rear part and the rear side of the rear waistline fitting area 211 extend in the front-rear direction through the interior body non-fixed area 202. As described above, by passing the diagonally crossing elastic elastic member 70 through the interior body non-fixed region 202 on the front side from the rear end portion of the front waistline fit region 210 and the rear side from the front end portion of the rear waistline fit region 211, The contraction force due to the cross elastic elastic member 70 acts only on the interior body 200 directly on the front side from the rear end portion of the front waistline fit region 210 and on the rear side from the front end portion of the rear waistline fit region 211. Therefore, it is possible to prevent an adverse effect on the exterior body 12. In particular, even in the case where the stretchable region by the diagonally crossing elastic stretchable member 70 and the waistline stretchable region 12X overlap each other, they are substantially independent from each other while forming a substantially stretched integral stretched portion. Therefore, it is possible to effectively prevent deterioration of appearance and wearing feeling.

  Of course, as shown in FIG. 12, the entire diagonally crossing elastic elastic member 70 may be positioned in the interior body fixing region 201.

On the other hand, since the contraction force concentrates at the intersections of the diagonally crossing elastic stretch members 70, the absorbent body 56 is likely to collapse at the corresponding portions. Therefore, as shown in FIG. 10, the absorber 56 is prevented from collapsing by forming in advance a penetrating portion 56 </ b> H penetrating in the thickness direction at a portion of the absorber 56 that overlaps the intersection of the diagonally intersecting elastic elastic members 70. It is one preferred form. The shape and dimensions of the penetrating portion 56H can be determined as appropriate, but a rectangular or elliptical shape that is long in the width direction is preferable, and the area is preferably about 5 to 10 cm ² .

<Others>
(A) As shown in Patent Documents 1 to 5, the exterior body 12 in the illustrated form extends along the leg opening LO, and the leg-hole elastic stretchable member, or along the front-rear direction without crossing each other. Although no extending elastic elastic member is provided, at least one of them can be supplementarily provided in the present invention.

(B) The form shown by FIG. 1 etc. has individually the front exterior body 12F which comprises the front body F, and the rear exterior body 12B which comprises the back body B as the exterior body 12, and these front exterior bodies 12F and the rear exterior body 12B are application examples to the exterior two-part split type configuration in which the front and rear bodies 12B are separated from each other in the front-rear direction. The above-described diagonally crossing elastic elastic member 70 can also be applied to a form having an integral exterior body 12 that passes through the above. In this case, the crotch cover sheet 12M can be omitted.

  Comparative Example 1 shown in FIG. 13, in which the crossing angle β in the front-rear direction of the intersection of the diagonal cross elastic elastic member 70 is 156 degrees, the pant-type disposable diaper shown in FIGS. Comparative Example 2 shown in FIG. 14 in which the intersections of the cross elastic elastic members 70 are two front and rear, and the cross angle β in the front and rear direction of each cross point is 170 degrees, and the cross angle β in the front and rear direction of each cross point is 20 A comparative example 3 shown in FIG. 16 provided as a degree, and a comparative example 4 similar to the example 1 except that there is no oblique cross elastic stretchable member 70 are prepared. Went. The specifications of the pants-type disposable diaper used in the test (the dimensions and all other values in the unfolded state) are as follows. The materials and structures are the same except for the presence / absence and arrangement of the diagonally crossing elastic stretch members.

(Specification common to each example)
・ Diaper dimensions Overall length Y: 500mm
Full width X: 374mm
The length in the front-rear direction of the waist end W: 25 mm
Longitudinal length of the waist part T: 120 mm
-Elongated elastic expansion / contraction member 15 of the waist lower part U in the front body F
Thickness: 470 dtex
Elongation rate: 270%
Number: 17 Interval: 5mm
-Elongated elastic expansion / contraction member 15 of the waist lower part U in the back body B
Thickness: 470 dtex
Elongation rate: 270%
Number: 20 spacing: 5mm
-An elongated elastic elastic member 16 in the middle part L in the back body B
Thickness: 470 dtex
Elongation rate: 270%
Number: 3 Interval: 10mm
The elongated elastic elastic member 17 at the waist end W
Thickness: 620 dtex
Elongation rate: 225%
Number: 10 Interval: 5mm
-Dimensions of interior body 200 Total length: 425mm
Full width: 140mm
-Dimensions of absorber 56 Total length 56Y: 375mm
Full width 56X: 140mm
-Absorbent weight, etc. Pulp fiber: 109 g / m ²
Superabsorbent polymer: 204 g / m ²
Water absorption of superabsorbent polymer: 60 g / g

(Specifications of Example 1)
・ An oblique cross elastic elastic member 70
Existence: Existence Arrangement shape: Fig. 2
Number: One each on the left and right Thickness: 620 dtex
Elongation rate: 270%
Intersection position: 10mm forward of the diaper front / rear center
Acute angle crossing angle α to the front-rear direction: 0 to 25 degrees Crossing angle β of the front-rear direction: 50 degrees

(Specifications of Example 2)
・ An oblique cross elastic elastic member 70
Existence: Existence Arrangement shape: Fig. 15
Number: One each on the left and right Thickness: 620 dtex
Elongation rate: 270%
Intersection position: 10mm forward of the diaper front / rear center
Acute angle crossing angle α to the front-rear direction: 0 to 45 degrees Crossing angle β of the front-rear direction of intersection: 90 degrees

(Specification of Comparative Example 1)
・ An oblique cross elastic elastic member 70
Existence: Existence Arrangement shape: Fig. 13
Number: One each on the left and right Thickness: 620 dtex
Elongation rate: 270%
Intersection position: 10 mm behind the center of the diaper in the front-rear direction
Acute angle crossing angle α to the front-rear direction: 0 to 78 degrees Crossing angle β of the front-rear direction of the intersection: 156 degrees

(Specifications of Comparative Example 2)
・ An oblique cross elastic elastic member 70
Existence: Existence Arrangement shape: Fig. 14
Number: One each on the left and right Thickness: 620 dtex
Elongation rate: 270%
Intersection position: 70mm forward and 70mm rearward of the center of the diaper
Acute angle crossing angle α to the front-rear direction: 0 to 85 degrees Crossing angle β of the front-rear direction of the intersection: 170 degrees

(Specifications of Comparative Example 3)
・ An oblique cross elastic elastic member 70
Existence: Existence Arrangement shape: Fig. 16
Number: One each on the left and right Thickness: 620 dtex
Elongation rate: 270%
Intersection position: 10 mm behind the center of the diaper in the front-rear direction
Acute angle crossing angle α to the front-rear direction: 0 to 26 degrees Crossing angle β of the front-rear direction of the intersection: 20 degrees

(Specification of Comparative Example 4)
・ An oblique cross elastic elastic member 70
Existence: None

(Walking test after large amount of absorption)
The pants-type disposable diaper of each example is attached to a dummy doll that can be walked, 300 cc artificial urine is supplied to the crotch at a speed of 750 cc / sec, and after 3 minutes from the completion of the artificial urine supply, 60 steps / After performing 100 steps of walking at a walking speed of minutes, a photograph was taken from the front and the state of the groin hanging was observed.

(Test results)
A photograph of the test result of Example 1 is shown in FIG. 17A, a photograph of the test result of Example 2 is shown in FIG. 17B, a photograph of the test result of Comparative Example 1 is shown in FIG. The photograph of the test result of 2 is shown in FIG. 18B, the photograph of the test result of Comparative Example 3 is shown in FIG. 18C, and the photograph of the test result of Comparative Example 4 is shown in FIG. In the conventional example, the comparative example 1 and the comparative example 2, the large lump of the gelled portion formed in the crotch portion is deformed long by being sandwiched between both legs, and the crotch portion of the diaper is narrowly projected downward due to the influence. It became the shape (hanging state). On the other hand, in Example 1 and Example 2, the movement concentration of the gelled part and the deformation to the sagging state were alleviated, and the sagging of the crotch part after a large amount of absorption could be effectively prevented. Moreover, in the Example, the groove | channel formed by shrinkage | contraction of a diagonal crossing elastic elastic member was not conspicuous, and the appearance also became favorable.

<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.

  The “deployed state” means a state in which the portion contracted by the elastic elastic member is completely extended and expanded from the natural length state.

  “Elongation rate” means a value when the natural length is 100%.

" Artificial urine " is 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 0.09 wt% is mixed and used at a temperature of 40 degrees unless otherwise specified .

  -"Gel strength" is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

  ・ "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, 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 can be used for pants-type disposable diapers such as the above examples.

  A1 ... Non-stretchable region, A2 ... Stretchable region, B ... Back body, L ... Diaper intermediate region, LO ... Leg opening, T ... Trunk circumference region, U ... Waist lower part, W ... Waist part, WO ... Waist opening, F ... front body, 11 ... liquid-impermeable sheet, 12 ... exterior body, 12A ... side seal part, 12B ... rear side exterior body, 12F ... front side exterior body, 12H ... inner sheet layer, 12M ... crotch part cover sheet, 12S ... outer sheet layer, 12X ... waist circumference elastic region, 12r ... waist side folded portion, 14 ... buttocks cover part, 18 ... unnecessary elastic elastic member, 25 ... display sheet, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorption Element: 56 ... Absorber, 56H ... Penetration part, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 70 ... Diagonally cross elastic elastic member, 200 ... Interior body, 201 ... Interior body fixing region 210 ... the front waist fit area, 211 ... rear waist fit area.

Claims (7)

An exterior body that individually or integrally configures the front and back bodies; and
An interior body including an absorbent body attached to the intermediate portion in the width direction of the exterior body so as to extend from the front body to the back body,
The absorbent body is formed by holding a superabsorbent polymer in a fiber assembly,
By forming both side portions of the front body exterior body and both side portions of the rear body exterior body to form side seal portions, a waist opening and a pair of left and right leg openings are formed,
The exterior body is a waistline expansion / contraction region that elastically expands and contracts in the width direction at least on both sides in the width direction of the interior body fixing region to which the interior body is fixed, of the waistline region corresponding to the side seal portion. have,
In pants-type disposable diapers;
The interior body has a front waistline fit region and a back waistline fit region respectively corresponding to the waistline stretchable region of the front body and the waistline stretchable region of the back body in the front-rear direction,
From the left end of the front waistline fit region to the right side end of the rear waistline fit region, the rear waist is gradually positioned on the right side, and from the right end of the front waistline fit region to the rear gradually extend respectively so as to be positioned on the left side, and a pair of elongated obliquely intersecting with one of the intersection of the widthwise middle portion of the crotch portion together toward the rear side to the left side end portion of the waist-fit region The cross elastic elastic member is fixed to the back side of the absorbent body in the interior body in a state of extending in the extending direction,
The pair of diagonally crossing elastic elastic members has a crossing angle in the front-rear direction at the intersection of 45 to 90 degrees, and the front and rear sides from the intersection between the front waistline fit region and the back waistline fit region. Extending so that the acute angle crossing angle with respect to the front-rear direction decreases respectively toward
A pants-type disposable diaper characterized by that.   The outer body does not have leg elastic elastic members extending along the leg openings, and the inner body does not have a pulling elastic elastic member extending in the front-rear direction without crossing each other. Item 1. A pants-type disposable diaper according to item 1.   The front exterior body constituting the front body and the rear exterior body constituting the rear body are individually provided as the exterior body, and the front exterior body and the rear exterior body are separated in the front-rear direction. A pants-type disposable diaper according to 1 or 2.   The underpants type disposable diaper of any one of Claims 1-3 in which the penetration part penetrated in the thickness direction is formed in the site | part which overlaps with the intersection of the said diagonal crossing elastic elastic member in the said absorber.   The diagonally crossing elastic elastic member extends from the rear end portion of the front waistline fit region to the front side and from the front end portion of the rear waistline fit region to the rear side, and at least the rear end portion of the front waistline fit region. And at the front end of the rear waistline fit region, it is fixed to the interior body, and at least at the front side from the rear end of the front waistline fit region and at the rear side from the front end of the rear waistline fit region, The pants-type disposable diaper according to any one of claims 1 to 4, which is not fixed. The trunk periphery stretchable region in the exterior body extends to both ends in the width direction of the interior body fixing region,
A fixed portion of the diagonally crossing elastic stretchable member with respect to the interior body is extended to at least a portion overlapping the waistline stretchable region at both ends in the width direction of the interior body securing region;
The underpants type disposable diaper of any one of Claims 1-5. Both side portions of the interior body are interior body non-fixed areas on the exterior body, and the interior body fixing area is provided between these interior body non-fixed areas,
The diagonally crossing elastic elastic member extends from the rear end portion of the front waistline fit region to the front side and from the front end portion of the rear waistline fit region to the rear side, and at least the rear end portion of the front waistline fit region. The front side and the rear side from the front end portion of the rear waistline fit region are extended in the front-rear direction through the interior body non-fixed region,
The underpants type disposable diaper of any one of Claims 1-6.