JP6536934B2 - Pants type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper that can prevent curling at the waist end.

  The pants-type disposable diaper includes an outer body that individually or integrally configures a front body and a rear body, and an inner body including an absorber attached to the inner surface of the outer body so as to extend from the front body to the rear body. Generally, a waist opening and a pair of left and right leg openings are formed by forming a side seal portion by joining the side edges of the outer body of the front body and the side edges of the outer body of the rear body. It is

  In the pants-type disposable diaper, in order to improve the fit to the body, various elastic stretchable members are provided on the outer package to provide stretchability (see, for example, Patent Document 1). For example, it is common to provide a waist end elastic stretch member so as to expand and contract in the width direction at the waist end of the outer package, and in the case where such a waist end elastic stretch member is conventionally provided, the outer package The waist end of the sheet has a structure in which a plurality of sheet layers are laminated, and between the layers, an elongated elastic stretchable member such as rubber thread is disposed as a waist end elastic stretchable member.

JP, 2014-166242, A Unexamined-Japanese-Patent No. 2003-305083

  However, the conventional pants-type disposable diaper has a problem that the waist end tends to be curled outward or inward due to the friction with the clothes or the external force applied by the hand of the wearer. If such a curl at the waist end occurs, the wearing feeling may be deteriorated or the tightening mark may be easily formed, which is not preferable.

  Then, the main subject of this invention is providing the pants type disposable diaper which can prevent the curling of a waist end.

The pants-type disposable diaper which solved the said subject is as follows.
< First pants type disposable diaper >
An exterior body that individually or integrally configures a front body and a back body;
An interior body including an absorbent body attached to the inner surface of the exterior body so as to extend from the front to the crotch and across the back;
A pants-type disposable diaper having a waist opening and a pair of left and right leg openings formed by joining side edges of an outer body of a front body and side edges of an outer body of a rear body to form a side seal portion. In
The waist end of the exterior body of at least one of the front body and the rear body overlaps an outer stretchable portion that elastically stretches in the width direction at least on the side of the waist opening, and an inner side of the outer stretchable portion. It has an inner stretchable portion which is elastically stretched in the width direction, which is not continuously joined in the width direction or intermittently joined in the width direction between the side seal portions with respect to the inner surface of the stretchable portion.
Pants type disposable diaper characterized by.

(Action effect)
In this pants-type disposable diaper , when an external force is applied such that the waist end is twisted, for example, a force toward the crotch side acts on the edge of the waist opening, the outer stretchable portion is deformed to bulge away from the inner stretchable portion. Is restored to its original state, that is, the state in which the outer stretchable portion and the inner stretchable portion overlap. At this time, the outer stretchable portion and the inner stretchable portion both elastically stretch in the width direction, whereby the inner stretchable portion is maintained in close contact with the skin, and the outer stretchable portion is deformed and restored by the elastic stretch in the width direction. . Therefore, according to the present pants type disposable diaper , the waist end becomes extremely difficult to get bent. On the other hand, in the prior art, when an external force is applied such that the waist end is twisted, the force is released to some extent and deformed so as to endure it, but it is easy to drown, and once it is twisted, the elastic stretch force is strained. Will work to maintain the The same result is obtained in the case where the waist end has a hollow two-layer structure but the elastic stretchable portion does not have two layers as described in Patent Document 2.

<Second pants-type disposable diapers>
At least a waist end portion of the exterior body includes a first sheet layer folded back at the waist opening, a second sheet layer folded back at the waist opening, an inner portion of the first sheet layer, and an inner side of the second sheet layer An inner elastic stretchable member mounted in a state extending in the width direction between the portions, and an outer elastic form mounted in a direction extending in the width direction between the outer portion of the first sheet layer and the outer portion of the second sheet layer And a telescopic member,
The inner stretchable portion is formed by the inner portion of the first sheet layer, the inner portion of the second sheet layer, and the inner elastic stretchable member,
The outer stretchable portion is formed by an outer portion of the first sheet layer, an outer portion of the second sheet layer, and an outer elastic stretchable member.
The first pants-type disposable diaper.

(Action effect)
As described above, by forming the inner stretchable portion and the outer stretchable portion into the folded structure of the first sheet layer and the second sheet layer, the above-described deformation and recovery become excellent, which is preferable.

<Third of the pants-type disposable diapers>
The second pants-type disposable diaper, wherein the outer stretchable portion extends more to the crotch side than the waist end.

(Action effect)
In the pants type disposable diaper, an elastic stretchable member is attached to the crotch more than the waist end of the outer package to improve the fit. In the pants-type disposable diaper , the attachment structure of the elastic stretchable members other than the waist end is not particularly limited. Therefore, it is possible to separately form the waist end other than the waist end and splice it to the waist end. By extending the part to the crotch side, the integral formation is preferable because the structure is simplified and the manufacture is facilitated.

< The fourth pants type disposable diaper >
The second underpants type disposable diaper, wherein the inner stretchable portion extends on the front-rear direction end of the inner body.

(Action effect)
In the case of a pants-type disposable diaper having a structure in which the inner body is attached to the inner surface of the outer body, the front and rear end portions of the inner body may be Coating with a non-woven fabric or the like to be configured is performed. However, the conventional covering structure is only covered with a thin non-woven fabric, and the covering effect has room for improvement.
On the other hand, when it is configured as described in this section, the first elastic layer and the second elastic layer shrink and the wrinkles are formed, and the thickness is increased and the compression recovery in the thickness direction is achieved. Because the front and rear ends of the interior body are covered by the rich inner stretchable part, the corners and surface irregularities of the front and rear ends of the interior body do not appear on the inner surface, and the front and back ends of the interior body do not feel the skin Can.

<Fifth pants-type disposable diapers of>
At least the widthwise middle portion of the portion of the inner stretchable portion overlapping the front-rear direction end portion of the interior body is a free portion not joined to the interior body, and the exterior body is provided on both sides in the width direction of this free portion fixed part is provided which is joined to the have the inner resilient and elastic members at the distal end of the free portion, the fourth pants-type disposable diaper.

(Action effect)
When the inner stretchable portion is extended to the end of the inner body in the front-rear direction, with such a structure, the free portion of the inner stretchable portion rises at the front and rear ends of the inner body and blocks movement of excrement It is preferable because it can be

  According to the present invention, advantages such as being a pants-type disposable diaper capable of preventing curling at the waist end are provided.

It is a top view in the state where a diaper was developed which shows the inside of a pants type disposable diaper. It is a top view in the state where a diaper was developed showing the outer surface of a pants type disposable diaper. It is the 3-3 sectional drawing of FIG. It is 4-4 sectional drawing of FIG. (A) 5-5 sectional drawing of FIG. 1, and (b) 6-6 sectional drawing of FIG. It is the top view in the state which developed the diaper which shows only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is sectional drawing which shows the state which expand | deployed the folding | returning part of the exterior body. FIG. 7 is a cross-sectional view relatively showing the anti-twisting action of the waist end. It is a top view in the state where a diaper was developed which shows the inside of a pants type disposable diaper. (A) It is sectional drawing corresponded to 5-5 cross section of FIG. 1, (b) It is sectional drawing corresponded to 6-6 cross section of FIG. (A) It is sectional drawing corresponded to 5-5 cross section of FIG. 1, (b) It is sectional drawing corresponded to 6-6 cross section of FIG. It is a photograph which shows a measurement part. It is a photograph of the situation where the yearning occurred.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
1 to 8 show an example 100 of a shorts-type disposable diaper. The pants-type disposable diaper 100 is composed of an exterior body 12 forming an outer surface (back side) of the product and an inner body 200 attached to the inner surface of the exterior body 12. The symbol Y indicates the total length of the diaper in the unfolded state (longitudinal length from the edge of the waist opening WO of the front part F to the edge of the waist opening WO of the back part B), and the symbol X indicates the full width of the diaper in the unfolded state Is shown.

  The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior body 12 is a portion for supporting the interior body 200 with respect to the wearer's body. The dotted portions in the figure indicate an adhesive as a joining means for joining the respective constituent members, and by using a solid such as a hot melt adhesive, a bead, a curtain, a summit or spiral application, etc. The fixed portion is formed by application to the outer peripheral surface of an elastic stretchable member such as a comb gun or a sure wrap application instead or together with this. As bonding means for bonding the respective constituent members, welding means such as heat seal or ultrasonic seal can be used.

(Interior body)
The inner body 200 can have any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the inner body 200 is provided with a surface sheet 30 on the body side, a liquid impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main part that carries the absorption function. The code | symbol 40 has shown the intermediate sheet (second sheet) provided between the surface sheet 30 and the absorption element 50, in order to make the liquid which permeate | transmitted the surface sheet 30 transfer to the absorption element 50 rapidly, and 60 These show the solid gathers 60 which stood on the body side provided in the both sides of the interior body 200, in order to prevent that the excretion leaks to the both sides of the interior body 200. As shown in FIG.

(Front sheet)
The top sheet 30 has a property of transmitting liquid, and can be exemplified by a non-porous or non-porous non-woven fabric, a porous plastic sheet, and the like. Moreover, among these non-woven fabrics, the raw material fibers are not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., mixed fibers of which two or more are used, composite fibers Etc. can be illustrated. Furthermore, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as spun lace method, spun bond method, thermal bond method, melt blown method, needle punch method, air through method, point bond method and the like. For example, if flexibility and drape are required, the spun bond method and spun lace method require bulkiness and softness, and the air through method, point bond method and thermal bond method are preferable processing methods. .

  Further, the top sheet 30 may be formed of one sheet or may be formed of a laminated sheet obtained by bonding two or more sheets. Similarly, the surface sheet 30 may be a single sheet or two or more sheets in the plane direction.

  When the solid gathers 60 are provided, both sides of the top sheet 30 pass between the liquid impermeable sheet 11 and the solid gathers 60 and turn to the back side of the absorbent element 50 to prevent penetration of the liquid. It is preferable to adhere to the impermeable sheet 11 and the three-dimensional gather 60 by a hot melt adhesive or the like.

(Intermediate sheet)
In order to rapidly transfer the liquid having permeated through the surface sheet 30 to the absorber, an intermediate sheet (also referred to as a “second sheet”) 40 having a liquid permeation rate faster than that of the surface sheet 30 can be provided. This intermediate sheet 40 not only allows the liquid to be rapidly transferred to the absorber to enhance the absorption performance by the absorber, but also prevents the phenomenon of "reversion" from the absorber of the absorbed liquid, and always dries on the top sheet 30 It can be in a state of The intermediate sheet 40 can be omitted.

As the intermediate sheet 40, materials similar to those of the surface sheet 30, spun lace, spun bond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond or crepe paper can be exemplified. In particular, an air through non-woven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber as 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, 22~60g / m} 2 is more preferable. The thickness of the non-woven material fiber is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core at the center, hollow fibers, eccentric and hollow fibers as mixed fibers of all or part of the raw material fibers.

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

(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 non-woven fabric having a plastic film on the surface of a non-woven fabric, or a plastic film A laminated sheet etc. which overlapped and joined a nonwoven fabric etc. can be illustrated. For the liquid impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that is preferably used in recent years from the viewpoint of preventing bleeding. 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 to form a sheet, and then stretching in a uniaxial or biaxial direction Is widely used. In addition, non-woven fabric using microdenier fibers, reinforcement of leakproofness by reducing the voids of the fibers by applying heat and pressure, and methods of coating highly water-absorbent resin or hydrophobic resin or water repellent agent Thus, a sheet which is made liquid impermeable without using a plastic film can also be used as the liquid impermeable sheet 11.

  The liquid-impervious sheet 11 has a width that fits on the back side of the absorbent element 50 as shown, and the side of the top sheet 30 of the absorbent element 50 is wound around both sides of the absorbent element 50 to enhance leakproofness. It can also be extended to both sides. The width of the extension portion is preferably about 5 to 20 mm on each side.

  In addition, on the inner side of the liquid impermeable sheet 11, in particular, on the side surface of the absorber 56, it is possible to provide an excretion indicator whose color changes due to absorption of the liquid content.

(3D gather)
The three-dimensional gather 60 is a strip-shaped member extending along the both sides of the inner body 200 in the front-rear direction, and blocks urine or loose stool moving laterally on the surface sheet 30 to prevent side leakage. Provided for The three-dimensional gather 60 of the present embodiment is provided to stand up from the side portion of the inner body 200, and the portion on the root side stands obliquely toward the central side in the width direction, and the portion on the tip side from the middle portion has a width It stands diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds a band-shaped gather sheet 62 having a length equal to the longitudinal length of the inner body 200 in the width direction and folds it into two, and A plurality of elongated elastic stretchable members 63 are fixed in a stretched state along the longitudinal direction at intervals in the width direction. The base end of the solid gather 60 opposite to the tip (the end opposite to the sheet-folded portion in the width direction) is a mounting portion 65 fixed to the back of the side edge of the interior body 200, The portion other than the mounting portion 65 is a projecting portion 66 (portion on the folded portion side) protruding from the mounting portion 65. Further, the protruding portion 66 is composed of a root side portion toward the center in the width direction and a tip side portion folded back outward in the width direction from the tip of the root side portion. This form is a surface contact type solid gatherer, but a line contact type solid gatherer (not shown) which is not folded back in the width direction can also be adopted. Further, the hot melt adhesive (in place of or in addition to this, fixing means by material welding such as heat sealing, ultrasonic sealing, etc. to the side surface of the surface sheet 30 with the both ends in the front and rear direction of the projecting portion 66 being in a laid down state Can also be used as the front and rear fixed portion 67 fixed by the front and rear direction fixed portion 67, while the front and rear direction intermediate portion located between them is The elastic member 63 is fixed in an extended state.

The gather sheet 62 is a flexible, uniform, high-masking non-woven fabric such as a spunbond non-woven fabric (SS, SSS, etc.), SMS non-woven fabric (SMS, SSMMS, etc.), melt-blown non-woven fabric, etc. The treated one can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . A rubber thread or the like can be used as the elongated elastic stretchable member 63. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. 150 to 350% is preferable and 200 to 300% of the elongation rate at the time of fixation is more preferable. The term "extension rate" means a value when the natural length is 100%. Also, as shown, a waterproof film 64 can be interposed between the two-folded gather sheet.

  The number of the elongated elastic stretchable members 63 provided in the free portion of the solid gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is suitably 3 to 10 mm. With this configuration, the skin can be easily hit in the area where the elongated elastic stretchable member 63 is disposed. The elongated elastic stretchable member 63 may be disposed not only on the distal end side but also on the root side.

  An object to which the mounting portion 65 of the solid gather 60 is fixed can be an appropriate member such as the surface sheet 30 in the interior body 200, the liquid impermeable sheet 11, and the absorbent element 50.

  In the three-dimensional gather 60 thus configured, although the contraction force of the elongated elastic elastic member 63 acts to bring the both ends in the back and forth direction closer, the both ends of the projecting portion 66 are fixed so as not to stand up. On the other hand, since the space between them is a non-fixed free part, only the free part stands up to abut on the body side as shown in FIG. In particular, when the mounting portion 65 is positioned on the back side of the interior body 200, the solid gathers 60 stand upright so as to open outward in the width direction at the crotch and its vicinity, It will come in contact and the fit will be improved.

  The dimensions of the solid gather 60 can be determined as appropriate, but in the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the solid gather 60 (length in the width direction of the projecting portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, in particular 20 to 40 mm. Further, it is preferable that the separation distance W3 between the folds positioned at the innermost position in the flat folded state so as to make the solid gather 60 parallel to the surface of the top sheet 30 is 60 to 190 mm, particularly 70 to 140 mm.

  It should be noted that, unlike the illustrated embodiment, solid gathers can be provided double (two rows) on each of the left and right sides of the interior body 200.

(Absorbent element)
The absorbent element 50 has an absorbent body 56 and a packaging sheet 58 which wraps the whole of the absorbent body 56. The packaging sheet 58 can also be omitted.

(Absorber)
The absorber 56 can be formed by an assembly of fibers. As this fiber assembly, a filament assembly obtained by opening as needed a fiber (a fiber bundle) of synthetic fibers such as cellulose acetate in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber weight may be, for example, about 100 to 300 g / m ² in the case of stacking cotton-like pulp or short fibers, and in the case of filament aggregate, for example, about 30 to 120 g / m ^2. Can. The fineness in the case of a synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The crimp degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably 15 to 50 per 2.54 cm. In addition, crimped fibers which are uniformly crimped are often used. It is preferable that the superabsorbent polymer particles be dispersed and held in the absorbent body 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 6, an hourglass having a front end portion, a rear end portion and a narrow portion located between them and narrower than the front end portion and the rear end portion. The shape is preferable because the fit around the legs of the absorber 56 itself and the three-dimensional gather 60 is improved.

  Although the size of the absorber can be determined as appropriate, it is preferable that the absorber extends in the front-rear direction and the width direction to the peripheral portion of the inner body or in the vicinity thereof. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorbent body 56 may contain superabsorbent polymer particles in part or all thereof. The superabsorbent polymer particles include "powder" in addition to "particles". As the super-absorbent polymer particles 54, those used for absorbent articles of this kind can be used as they are, for example by sieving (shake for 5 minutes) using a standard sieve of 500 μm (JIS Z8801-1: 2006) The proportion of particles remaining on the sieve is preferably 30% by weight or less, and the proportion of particles remaining on the sieve by sieving (shake for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 180 μm Is preferably 60% by weight or more.

  The material of the superabsorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Examples of the superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and crosslinked sodium carboxymethyl cellulose. A thing, an acrylic acid (salt) polymer, etc. can be used. The shape of the superabsorbent polymer particles is preferably in the form of commonly used powdery particles, but other shapes may 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 suitably used. If the water absorption rate is too slow, so-called reversion in which the liquid supplied into the absorber 56 returns out of the absorber 56 tends to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are suitably used. Thereby, even in the case of the bulky absorber 56, it is possible to effectively suppress the sticky feeling after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined in accordance with the absorption required for the application of the absorber 56. Therefore, although it can not generally say, it can be 50-350 g / m < ² >. If the basis weight of the polymer is less than 50 g / m ² , it will be 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 spray density or the spray amount in the planar direction of the absorber 56. For example, it is possible to increase the spray amount of the fluid excretory site from other sites. When considering gender differences, males can increase the spray density (amount) on the front side, and females can increase the spray density (amount) in the center. In addition, it is possible to provide a portion where no polymer is present locally (for example, in the form of a spot) in the planar direction of the absorber 56.

(Packaging sheet)
When the packaging sheet 58 is used, tissue paper, in particular, crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used as the material. However, it is desirable that it is a sheet from which the superabsorbent polymer particles can not escape. When non-woven fabric is used instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly preferable, and polypropylene, polyethylene / polypropylene composite material, etc. can be used as its material. The coating 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 superabsorbent polymer particles from the front and rear edges, a cylinder is used to surround the front and back and both sides of the absorber 56. It is preferable that the sheet is wound in a shape and the front and rear edges thereof are protruded from the front and back of the absorber 56, and the protruding part is crushed in the front and back direction and bonded by bonding means such as a hot melt adhesive.

(Exterior body)
The exterior body 12 has a portion forming a front body F extending from the center in the front-rear direction to the ventral side, and a portion forming a back body B extending from the center in the front-rear direction to the back side. As shown in FIG. 8, the waist opening WO for passing the torso of the wearer and the left and right for passing the legs are formed, as shown in FIG. A pair of leg openings LO are formed.

  The exterior body 12 has a waist portion T defined as a longitudinal range (a longitudinal range from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a longitudinal range of a portion forming the leg opening LO A longitudinal region having the side seal portion 12A of the front body F and an intermediate portion L defined as between the longitudinal direction region having the side seal portion 12A of the rear body B are provided. The waist T can be divided into a “waist end” W that conceptually forms an end on the waist opening side, and a “waist lower portion” U that is a lower portion than this. In general, in the case where the waist area T has a boundary at which the stretching stress in the width direction changes (for example, the thickness and the elongation rate of the elastic stretch member change), the waist opening WO side is the waist end than the boundary at the waist opening WO most When there is no such boundary, the waist opening WO side becomes the waist end W side than the absorber 56 or the inner body 200. The length in the longitudinal direction varies depending on the size of the product, and can be determined as appropriate. For example, the waist end W can be 15 to 40 mm, and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the middle portion L are narrowed along the circumference of the adherend's leg, and this is a site into which the wearer's leg is inserted. As a result, the exterior body 12 is generally shaped like an hourglass. The degree of constriction of the exterior body 12 can be determined as appropriate, and it may be made narrower than the width of the interior body 200 in the narrowest portion in order to have a clean appearance as in the embodiment shown in FIGS. Although it is preferable, the width may be determined to be equal to or greater than the width of the inner body 200 even in the narrowest portion.

  The exterior body 12 has a form continuous from the front body F to the back body B as shown in FIGS. 1 to 12 and, as shown in FIG. 13, a belly covering the belly side of the waist of the wearer. It is divided into the side exterior body 12F and the back side exterior body 12B covering the back side, and the front of the interior body 200 is provided on the inner surface in the width direction central portion of the ventral side exterior body 12F, and the width direction center portion of the back side exterior body 12B. It is also possible to connect the rear part of the inner body 200 to the inner surface with a hot melt adhesive or the like and separate the ventral outer covering 12F and the back outer covering 12B from each other without being continuous on the crotch side. In this case, on the back surface of the liquid impermeable sheet 11 in the inner body 200, the entire exposed portion between the ventral outer body 12 and the dorsal outer body 12 is covered so as to cover the entire back surface of the inner body 200. It is also possible to fix the exterior body 12 separately so as to cover it.

  Characteristically, the waist end W of the exterior body 12 in the front body F and the back body B (or any one of them) may be formed on the inside of the outer stretchable portion 70 that elastically stretches in the width direction. While overlapping, the side seal portion 12A is not continuously joined to the inner surface of the outer stretchable portion 70 in the width direction, and has an inner stretchable portion 80 elastically stretchable in the width direction. The outer stretchable portion 70 and the inner stretchable portion 80 are provided on the whole of the waist end W as long as they are provided at least on the side of the waist opening WO in the waist end W. It can also be a department. In addition, the inner stretchable portion 80 can be intermittently joined in the width direction to the outer stretchable portion 70 between the side seal portions 12A as shown in FIG. Reference numeral 22 in FIG. 11 indicates a joint between the outer stretchable portion 70 and the inner stretchable portion 80.

  In the pants-type disposable diaper configured as described above, as shown in FIG. 10A, when an external force that causes the waist end W to bend, for example, a force toward the crotch side acts on the edge of the waist opening WO, The outer stretchable portion 70 deforms so as to bulge away from the inner stretchable portion 80 (the state shown in the right figure), and when no force acts, the original state, ie, the outer stretchable portion 70 and the inner stretchable portion 80 overlap. Restore (the state of the left figure). At this time, both the outer stretchable portion 70 and the inner stretchable portion 80 elastically stretch in the width direction, whereby the inner stretchable portion 80 is maintained in close contact with the skin, and the outer stretchable portion 70 is deformed by the elastic stretch in the width direction. Restoration is done. Therefore, according to the present invention, the waist end W is extremely difficult to get scolded. On the other hand, in the prior art, as shown in FIG. 10 (b), when an external force is applied such that the waist end W is turned, the force is released to some extent and deformed so as to stand up, but it drowns. (It may turn to the outside as indicated by a solid line, and may also turn to an inside as indicated by a two-dot chain line), and once turned, the elastic stretch force acts to maintain the turning (see State). The same result is obtained in the case where the waist end portion W has a hollow two-layer structure but the elastically stretchable portion does not have two layers.

  The outer stretchable portion 70 and the inner stretchable portion 80 may be separately formed as shown in FIG. 13 and may be joined at the end on the waist opening WO side. As described above, the first sheet layer 12S folded at least at the waist end W of the exterior body 12 at the waist opening WO, the second sheet layer 12H folded at the waist opening WO, and the outer portion of the first sheet layer 12S And an outer elastic stretchable member 71 attached in an extended state in the width direction between the outer portions of the second sheet layer 12H, and a width between the inner portion of the first sheet layer 12S and the inner portion of the second sheet layer 12H And an inner elastic stretch member 81 attached in a state of being stretched in the direction, and the inner portion of the first sheet layer 12S, the inner portion of the second sheet layer 12H, and the inner elastic stretch member Forming a side stretchable portion 80, the outer portion of the first sheet layer 12S, preferably forms the outer telescopic part 70 by the outer portion and the outer resilient and elastic members of the second sheet layer 12H. As described above, when the outer stretchable portion 70 and the inner stretchable portion 80 have the folded structure of the first sheet layer 12S and the second sheet layer 12H, the above-described deformation and recovery become excellent. Such a folded structure is, as shown in FIG. 9, after attaching the outer elastic stretchable member 71 and the inner elastic stretchable member 81 between the first sheet layer 12S and the second sheet layer 12H, as shown by a two-dot chain line. It can be manufactured by forming the outer stretchable portion 70 and the inner stretchable portion 80 by folding back at a position at the edge of the waist opening WO. Although not shown, at least one of the outer stretchable portion 70 and the inner stretchable portion 80 may be formed solely of an elastically stretchable material such as a stretchable nonwoven fabric or an elastic stretch film.

  Although the first sheet layer 12S and the second sheet layer 12H can be formed of separate sheet materials as shown in FIG. 12, as shown in FIG. 5, one sheet material is folded back to be doubled. It is more preferable to form by When the outer stretchable portion 70 and the inner stretchable portion 80 are separately formed as shown in FIG. 13 and joined at the end on the waist opening WO side, the outer portion of the first sheet layer and the first sheet layer as shown in FIG. The outer part of the two sheet layers and the inner part of the first sheet layer and the inner part of the second sheet layer may be formed by folding back one sheet material or may be formed by separate sheet materials. Although not shown, the first sheet layer 12S and the second sheet layer 12H can be formed by joining a plurality of sheet materials, respectively.

As a material which forms the 1st sheet layer 12S and the 2nd sheet layer 12H, if it is a sheet-like thing, although it can use without limitation, it is preferred that it is a nonwoven fabric. The non-woven fabric is not particularly limited as to its raw material fiber. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., mixed fibers of which two or more are used, composite fibers Etc. can be illustrated. Furthermore, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as spun lace method, spun bond method, thermal bond method, melt blown method, needle punch method, air through method, point bond method and the like. When using a nonwoven fabric, it is preferable to make the fabric weight into about 10-30 g / m < ² >.

  The outer portion of the first sheet layer 12S and the outer portion of the second sheet layer 12H can extend to the crotch side of the waist end W. In this case, as shown in FIG. 5, the outer side of the first sheet layer 12S and the outer side of the second sheet layer 12H are extended to the crotch side, and as shown in FIG. Another sheet material can be seamed and extended to the outer portion of the layer 12S and the outer portion of the second sheet layer 12H. Further, in the case of adopting the stretchable structure of the present invention at both the front and rear waist ends W (it is also possible to use only one of them), the exterior body 12 is continued from the front body F to the back body B In such a case, as shown in FIGS. 5 and 12, the outer portion of the first sheet layer 12S of the front body F, the outer portion of the second sheet layer 12H, and the outer portion of the first sheet layer 12S of the rear body B The outer portion of the second sheet layer 12H can also be continuous. In these embodiments, by providing the outer elastic stretchable member 71 on the crotch side of the waist end W, the outer stretchable portion 70 can be extended to the crotch side of the waist end W.

  As in the illustrated embodiment, in the form in which the outer elastic stretchable member 71 is attached to the outer stretchable part 70 in the stretched state and the inner elastic stretchable member 81 is attached to the inner stretchable part 80 in the stretched state Synthetic rubber or natural rubber can be used, and the shape thereof may be a suitable shape such as a strip, a net or the like in addition to an elongated shape such as a thread or a string. In addition, for bonding of the first sheet layer 12S and the second sheet layer 12H and fixing of the outer elastic stretchable member 71 and the inner elastic stretchable member 81 sandwiched therebetween, hot melt adhesive by various coating methods, heat, etc. Well-known methods, such as a fixing means with material welding like a seal | sticker or an ultrasonic seal | sticker, can be used without a limitation in particular.

  The outer elastic stretchable member 71 and the inner elastic stretchable member 81 are provided at least at the waist end W. In the case of using elongated elastic elastic members 71 and inner elastic elastic members 81, a plurality of elongated elastic elastic members 71 81 are spaced in the front-rear direction and in the width direction at a predetermined expansion rate. It is desirable to fix in a state of being stretched along.

The narrow elastic elastic member 17 provided at the waist end W has a thickness of 100 to 1880 dtex, particularly about 100 to 620 dtex (in the case of a synthetic rubber. In the case of a natural rubber, a cross-sectional area of 0.05 to 1.5 mm ² , In particular, it is preferable to use a thread rubber of about 0.1 to 1.0 mm ² and fix at about 8 to 30 yarns at intervals of ² to 12 mm, with an elongation rate of 150 to 400%, particularly about 200 to 320%. The elongated elastic stretchable members 17 provided at the waist end W need not all have the same thickness and the same extension rate, and for example, the elastic stretchable members 17 at the waist opening WO side and the crotch side of the waist end W At least one of the thickness and the elongation may be different. Similarly, in the outer stretchable portion 70 and the inner stretchable portion 80, at least one of the thickness and the extension rate of the elongated elastic stretchable members 17 provided at the waist end W may be the same or different. One or more of the elongated elastic stretchable members 17 provided at the waist end W and disposed in the area adjacent to the lower waist portion U may overlap with the front-rear direction end of the inner body 200 As for the elongated elastic stretchable members 17 (especially those provided on the outer stretchable portion 70) overlapping the inner body 200, they are respectively provided on both sides in the width direction except a part or all of the portion overlapping the inner body 200. Also good.

When the outer stretchable portion 70 and the inner stretchable portion 80 extend to the waist lower portion U, the elongated elastic stretchable member 15 provided in the waist lower portion U has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (synthetic for rubber. cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular with a rubber thread 0.1~1.0mm about ^2), 5 ^1~15mm, especially at intervals of 3~8mm It is preferable to fix at about 30 to 30 and at an elongation rate of 200 to 350%, particularly about 240 to 300%. It is not necessary to make all of the elongated elastic stretchable members 15 provided in the lower waist portion U the same thickness and the same extension ratio, for example, the elastic stretchable members 15 on the waist opening WO side and the crotch side of the lower waist portion U At least one of the thickness and the elongation may be different. Similarly, in the outer elastic portion 70 and the inner elastic portion 80, at least one of the thickness and the elongation of the elastic elastic members 15 provided in the lower waist portion U may be the same or different. Of the elongated elastic stretchable members 15 provided in the lower waist portion U, the elongated elastic stretchable members 15 overlapping the interior body 200 (particularly, those provided on the outer stretchable portion 70) Alternatively, it may be provided on both sides in the width direction except for the whole.

When the outer stretchable portion 70 and the inner stretchable portion 80 extend to the middle portion L, the elongated elastic stretchable member 16 provided in the middle portion L has a thickness of about 155 to 1880 dtex, particularly about 470 to 1240 dtex (of synthetic rubber If. cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular with a rubber thread 0.1~1.0mm about ^{2), 2~10 5~40mm,} especially at intervals of 5~20mm It is preferable to fix at an elongation of about 150 to 300%, particularly about 180 to 260%. The elongated elastic stretchable members 16 provided in the middle portion L need not all have the same thickness and the same extension rate, and for example, the thick portions of the elastic stretchable members 16 at the waist opening WO side and the crotch side of the middle portion L At least one of the elongation and the elongation may be different. Similarly, in the outer stretchable portion 70 and the inner stretchable portion 80, at least one of the thickness and the extension rate of the elongated elastic stretchable member 16 provided in the middle portion L can be equalized or made different. A part of a portion of the elongated elastic stretchable member 16 provided in the middle portion L overlapping with the inner body 200 (in particular, the one provided in the outer stretchable portion 70) It may be provided on both sides in the width direction except for the whole.

  Of the elastic stretchable members 15 to 17 provided on the exterior body 12 as shown in the drawing, the parts 15 and 16 provided in the front-rear direction area overlapping the interior body 200 are a part of the portion overlapping the interior body 200 or When the interior body 200 is provided on both sides in the width direction except for all, the interior body 200 does not shrink more than necessary in the width direction, and the appearance does not deteriorate and the absorbability does not decrease. In this embodiment, in addition to the embodiment in which the elastic stretchable members 15 and 16 exist only on both sides in the width direction, the elastic stretchable members 15 and 16 exist across the interior body 200 from one side to the other side in the width direction. The elastic stretchable members 15 and 16 are finely cut in part or all of the portion overlapping the inner body 200, and no contraction force acts (substantially equivalent to the absence of the elastic stretchable member), and the width thereof Also included is an embodiment in which only both sides of the direction are configured as a contractile force acting part. Of course, the arrangement form of the elastic stretchable member 15 provided in the lower waist portion U and the elastic stretchable member 16 provided in the middle portion L is not limited to the above example, and stretches over the entire width direction including the portion overlapping the interior body 200 A part or all of the elastic stretchable members 15 and 16 may be provided across the interior body 200 from one side to the other side in the width direction so that force is applied.

  On the other hand, extending the inner stretchable portion 80 to the end of the inner body 200 in the front-rear direction is one preferred embodiment. That is, in the case of the underpants type disposable diaper having a structure in which the inner body 200 is attached to the inner surface of the outer body 12, the touch may be deteriorated if the front and rear ends of the inner body 200 are exposed. It is carried out that the end is covered with the nonwoven fabric etc. which constitute the exterior body 12. However, the conventional covering structure is only covered with a thin non-woven fabric, and the covering effect has room for improvement. On the other hand, when the inner stretchable portion 80 is extended to the end of the inner body 200 in the front-rear direction, the first elastic layer 81 shrinks the first sheet layer 12S and the second sheet layer 12H to form wrinkles. The thickness increases, and the front and rear end portions of the interior body 200 are covered with the inner stretchable portion 80 rich in compression recovery in the thickness direction, so the corners and surface irregularities of the front and rear end portions of the interior body 200 It does not appear, and it is possible to eliminate the feeling that the front and rear ends of the interior body 200 hit the skin.

  Furthermore, in the case where the inner stretchable portion 80 is extended to the end of the inner body 200 in the front-rear direction, the portion of the inner stretchable portion 80 overlapping the front-rear direction end of the inner body 200 has at least a width The direction intermediate portion L is a free portion 82 not joined to the inner body 200, and is a fixed portion 83 joined to the exterior body 12 on both sides in the width direction of the free portion 82. It is also preferable that the elastic stretchable member 81 be provided. Such a structure is preferable because the free parts 82 of the inner stretchable part 80 can rise up to the front and rear ends of the inner body 200 and block movement of excrement.

  The fixing of the inner stretchable portion 80 to the outer member between the side seal portions 12A is performed as long as the waist end W is not joined or intermittently joined in the width direction to the outer stretchable portion 70. Although it is good also as whole surface adhesion | attachment except a thing, it is desirable to make it the same as the waist end part W from a viewpoint of the thickness increase by a softness | flexibility or a contraction wrinkle. However, since it is not preferable that the crotch-side end of the inner stretchable portion 80 move too freely, the crotch-side end of the inner stretchable portion 80 is an outer member (the outer stretchable portion 70 and the outer stretchable portion 70 in the illustrated embodiment) It is desirable to fix to the interior body 200), and to make the waist opening WO side the same as the waist end W more than that. This fixed part is indicated by reference numeral 21 in the figure.

  On the other hand, in the illustrated embodiment, the outer stretchable portion 70 and the inner stretchable portion 80 are provided on both the front body F and the rear body B, but the inner stretchable portion 80 and the outer stretchable portion 70 are provided on only one of them. It is also possible to make it a known structure. Moreover, although it is desirable to provide the outer stretchable portion 70 and the inner stretchable portion 80 over the entire width direction of the waist end W, it may be a part, and in that case, the width direction middle portion in terms of ease of winding. It is desirable to provide L.

  A prototype of the pants-type disposable diaper (example) shown in FIGS. 1 to 10 (a), and the waist end of the exterior body having the conventional structure shown in FIG. 10 (b) (prior art) The following tests were performed using these test samples. The dimensions of the pants-type disposable diaper used in the test were as follows, and the common material and structure were the same except for the inner stretchable portion.

(Dimensions of each part of the diaper)
・ Length Y of the diaper in the unfolded state: 500 mm
・ Full width X of the diaper in the unfolded state: 374 mm
・ Longitudinal length of waist end W in unfolded state: 25 mm
-Length in the front-rear direction of the waist T in the unfolded state: 95 mm
An elongated elastic stretchable member 15 of the lower waist portion U in the outer stretchable portion 70 of the front body F
Thickness: 470 dtex
Growth rate 275%
Elongated elastic stretchable member 16 of the middle portion L in the outer stretchable portion 70 of the number 17 and the front body F
Thickness: 470 dtex
Growth rate 275%
Elongated elastic stretchable member 15 of the waist lower part U in the outer stretchable portion 70 of the number 2 and the back body B
Thickness: 470 dtex
Growth rate 275%
Elongated elastic stretchable member 16 of the middle portion L in the outer stretchable portion 70 of the number 20, front body F
Thickness: 470 dtex
Growth rate 275%
Elongated elastic stretchable member 17 of the waist end W in the number of three outer stretchable portions 70
Thickness: 200 dtex
250% growth rate
Elongated elastic stretchable member 17 of the waist end W in the number 10, inner stretchable portion 80
Thickness: 200 dtex
250% growth rate
Elongated elastic stretchable member 15 of lower waist portion U in number 10, inner stretchable portion 80 (common to front body F and back body B)
Thickness: 200 dtex
250% growth rate
Number of eight, length in the front-rear direction of the inner stretchable part 80 (common to front body F and back body B): 45 mm

(West end curling test)
Apply a test sample to the dummy doll (waist length 430 mm) properly so that there is no slippage or breakage, and further from above on the infant pants (made by Nishi Matsuya Chain Co., Ltd., brand name training pants, size 80, waist rubber) Part length (natural length) 320 mm), and after the waist rubber part of the infant pants is positioned above the waist opening of the test sample, the infant pants are sheared at a speed of 20 cm / sec. It was confirmed that there was a longing at the waist end. The test was performed 20 times for each sample, and the number of drowning was counted.

(Thickness measurement)
For each test sample, the thickness of the naturally-long diaper in the longitudinal direction corresponding to the front end of the inner body is shown in FIG. 14 at three locations, ie, the widthwise center of the front end of the inner body, the width of the front end of the inner body It measured in the width direction center between the direction end part (part which overlaps with a solid gather) and an interior body and a side seal part.

(Test results)
The test results are shown in Table 1. In the conventional example, in the example of the prior art, no wobbling occurred, whereas in the example, the wobbling occurred seven times in the waist end curling test. FIG. 15 shows a photograph of the situation where the yearning occurred. Further, from the thickness measurement results, it was found that the surface asperity was large in the conventional example and the surface asperity was small in the example.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings, unless otherwise specified in the specification.
"Longitudinal (longitudinal) direction" means a direction connecting the ventral side (front side) and back side (rear side), and "width direction" means a direction (horizontal direction) orthogonal to the longitudinal direction.
"Stretch rate" means the value when natural length is 100%.
・ "Age" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (the test place is at a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to be in a constant weight state. Pre-drying means making a sample or a test piece constant weight in an environment not exceeding a relative humidity of 10 to 25% and a temperature of 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture percentage is 0.0%. A sample of 200 mm × 250 mm (± 2 mm) in size is cut out from a test piece in a constant weight state using a rice-based board (200 mm × 250 mm, ± 2 mm). The weight of the sample is measured, and the weight per square meter is calculated and taken as the basis weight.
- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 0.098 N / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
The amount of water absorption is measured according to JIS K 7223-1996 “Test method of water absorption of highly water-absorbent resin”.
-Water absorption rate is defined as "time to end point" when JIS K 7224-1996 "Water absorption rate test method for super absorbent polymer" using 2 g of highly absorbent polymer and 50 g of physiological saline. .
・ If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be conducted in the test room or equipment in the standard condition (the test place is temperature 20 ± 5 ° C, relative humidity 65% or less) .

  The present invention can be used for the pants-type disposable diaper as described above.

  B: back body, F: front body, L: middle part, LO: leg opening, T: waist part, U: waist lower part, W: waist end, WO: waist opening, 11: liquid impermeable sheet 12, 12 exterior body, 12F: back side exterior body, 12H: second sheet layer, 12S: first sheet layer, 12r: folded portion, 30: top sheet, DESCRIPTION OF SYMBOLS 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorbent body, 58 ... Packaging sheet, 60 ... Three-dimensional gathers, 62 ... Gathered sheet, 70 ... Outer elastic part, 71 ... Outer elastic elastic member, 80 ... Inner elastic part, 81 ... Inside elastic stretchable member, 100 ... Pants type disposable diaper, 200 ... Interior body.

Claims (5)

An exterior body that individually or integrally configures a front body and a back body;
An interior body including an absorbent body attached to the inner surface of the exterior body so as to extend from the front to the crotch and across the back;
A pants-type disposable diaper having a waist opening and a pair of left and right leg openings formed by joining side edges of an outer body of a front body and side edges of an outer body of a rear body to form a side seal portion. In
The waist end of the exterior body of at least one of the front body and the rear body overlaps an outer stretchable portion that elastically stretches in the width direction at least on the side of the waist opening, and an inner side of the outer stretchable portion. It has an inner stretchable portion which is elastically stretched in the width direction and intermittently joined in the width direction between the side seal portions with respect to the inner surface of the stretchable portion.
Pants type disposable diaper characterized by. At least a waist end portion of the exterior body includes a first sheet layer folded back at the waist opening, a second sheet layer folded back at the waist opening, an inner portion of the first sheet layer, and an inner side of the second sheet layer An inner elastic stretchable member mounted in a state extending in the width direction between the portions, and an outer elastic form mounted in a direction extending in the width direction between the outer portion of the first sheet layer and the outer portion of the second sheet layer And a telescopic member,
The inner stretchable portion is formed by the inner portion of the first sheet layer, the inner portion of the second sheet layer, and the inner elastic stretchable member,
The outer stretchable portion is formed by an outer portion of the first sheet layer, an outer portion of the second sheet layer, and an outer elastic stretchable member.
The pants-type disposable diaper according to claim 1.   The pants-type disposable diaper according to claim 2, wherein the outer stretchable portion extends further to the crotch side than the waist end.   The pants-type disposable diaper according to claim 2, wherein the inner stretchable portion extends on the front-rear direction end of the inner body. An exterior body that individually or integrally configures a front body and a back body;
An interior body including an absorbent body attached to the inner surface of the exterior body so as to extend from the front to the crotch and across the back;
A pants-type disposable diaper having a waist opening and a pair of left and right leg openings formed by joining side edges of an outer body of a front body and side edges of an outer body of a rear body to form a side seal portion. In
The waist end of the exterior body of at least one of the front body and the rear body overlaps an outer stretchable portion that elastically stretches in the width direction at least on the side of the waist opening, and an inner side of the outer stretchable portion. It has an inner stretchable portion which is elastically stretched in the width direction, which is not continuously joined in the width direction between the side seal portions with respect to the inner surface of the stretchable portion,
The inner stretchable portion extends more to the crotch than the waist end, and the crotch-side end of the inner stretchable portion is fixed to the outer member over the entire width direction.
Pants type disposable diaper characterized by .