JP2016067433A - Underpants-type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants-type disposable diaper configured to easily pass the legs of a wearer through leg openings.SOLUTION: The underpants-type disposable diaper includes: stretchable areas E stretching in the width direction, at least at area in leg openings LO side in the width direction corresponding to the leg openings LO of an outer wrapper body 12; and shrinkage-ratio decrease areas D formed at parts in the leg openings LO sides in the stretchable areas E. A width-directional shrinkage ratio in a natural length state of each shrinkage-ratio decrease area is continuously or stepwisely decreases towards the leg opening LO side.SELECTED DRAWING: Figure 10

Description

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

  A pants-type disposable diaper is a product in which both sides of the front body and both sides of the back body are joined in advance to form a waist opening and a pair of left and right leg openings. A procedure is adopted in which both the legs of the wearer are passed through the leg openings through the waist openings and then pulled up to the waist.

  However, general pants-type disposable diapers are provided with elastic elastic members for tightening around the torso and legs, and the leg opening width is narrowed because it contracts greatly in the width direction before wearing. When the wearer's leg is passed through the leg opening, there is a problem that the leg tip is easily caught on the side part of the crotch part and the leg is difficult to pass.

JP 2008-161514 A JP 2008-48844 A

  Then, the main subject of this invention is providing the underpants type disposable diaper which is easy to let a wearer's leg pass through a leg opening.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior body that configures the front body and the back body individually or integrally, and an interior body including an absorbent body fixed to the inner surface of the exterior body,
By forming both side portions of the exterior body in the front body and both side portions of the exterior body in the back body to form side seal portions, a waist opening and a pair of left and right leg openings are formed,
The exterior body is an expansion / contraction region in which at least the region on the leg opening side in the width direction region corresponding to the leg opening extends and contracts in the width direction,
A shrinkage rate lowering region in which the widthwise contraction rate in the natural length state decreases continuously or stepwise as it goes toward the leg opening side in the portion on the leg opening side in the stretchable region is formed.
A pants-type disposable diaper characterized by that.

(Function and effect)
Since the present invention also includes an expansion / contraction region, the leg opening is narrowed to some extent by contraction in the width direction in the natural length state. However, in the present invention, the shrinkage rate lowering region in which the widthwise shrinkage rate in the natural length state is continuously or stepwise lowered as it goes toward the leg opening side is formed in the leg opening side portion in the stretchable region. The leg opening is much wider than before, and the leg of the wearer can be easily passed through the leg opening. Moreover, the entire stretchable area is not simply used as the shrinkage rate decreasing area, but the low stretchable area is provided in the portion on the leg opening side, so that the fit around the trunk hardly deteriorates. On the contrary, in the case of a wearer whose legs are thick from the base of the legs to the thighs, the fit around the legs is preferable.
Incidentally, the term "width direction shrinkage of the natural length state", when the time width direction maximum elongation in the width direction length of (when the elastic limit) and X _1, and the widthwise length of the natural length state X ₂ Is defined by the following equation (1).
(X ₁ −X ₂ ) / X ₁ × 100 (1)

<Invention of Claim 2>
The exterior body includes at least one of a front body and a back body, a waist part corresponding to the side seal part and a front-rear direction range, and a cover part that is a front-rear direction range on the center side in the front-rear direction than the waist part. And
The stretchable region is provided over the waist portion and the cover portion,
The shrinkage rate reduction region is provided from the middle in the front-rear direction of the waist portion to the cover portion.
The pants-type disposable diaper according to claim 1.

(Function and effect)
In the pants-type disposable diapers, a form having a cover part for covering the buttock and the buttock on the leg side of the waistline part is widely adopted, and not only the waistline part but also the cover part is an extension region. In such a configuration, the cover portion not only forms the edge of the leg opening, but the leg opening tends to be narrow. Therefore, in such a form, it is preferable to provide the shrinkage reduction region from the middle in the front-rear direction of the waistline portion to the cover portion.

<Invention of Claim 3>
The stretchable region includes an elongated elastic stretchable member for imparting stretchability to the shrinkage rate lowering region and the waist opening side region than the shrinkage rate region,
The elongated elastic elastic member in the region on the waist opening side of the shrinkage rate lowering region is thicker than the elongated elastic elastic member in the shrinkage rate lowering region or has a higher elongation rate when fixed.
The pants-type disposable diaper according to claim 1 or 2.

(Function and effect)
In pants-type disposable diapers, it is widely used to provide an elongated elastic elastic member for forming an elastic region. By using this, an elongated elastic expansion / contraction in the region closer to the waist opening than the region where the shrinkage rate decreases is used. If the member is thicker than the elongated elastic stretch member in the shrinkage rate reduction region or has a structure with a high elongation rate at the time of fixation, it is possible to compensate for a decrease in fit due to the provision of the shrinkage rate reduction region. preferable.

<Invention of Claim 4>
The stretchable region of the exterior body has an elastic stretchable member for stretching and an outer sheet layer and an inner sheet layer that cover the outer side and the inner side, respectively.
The outer sheet layer and the inner sheet layer in the stretchable region are joined by a sheet joining portion formed intermittently in the width direction,
The width of the sheet joint portion in the shrinkage reduction area is continuously or stepwise widened toward the leg opening side.
The underpants type disposable diaper of any one of Claims 1-3.

(Function and effect)
As described above, when the width of each sheet joint portion in the continuous stretchable region is changed, the widthwise contraction rate in the natural length state in the continuous stretchable region is continuously or stepwise lowered toward the leg opening side. Can do. Therefore, the effect of the present invention described above can be obtained only by changing the pattern of the sheet joint portion with respect to the existing design.

<Invention of Claim 5>
The width of the sheet joint portion in the shrinkage reduction region has a maximum width of 4 to 13 mm, a minimum width of 0 to 2 mm, and a maximum width of 5 times or more the minimum width,
The interval between adjacent sheet joints in the shrinkage reduction region is such that the maximum interval is 6 to 13 mm, the minimum interval is 0 to 5 mm, and the maximum interval is at least twice the minimum interval.
The pants-type disposable diaper according to claim 4.

(Function and effect)
Although the width | variety and space | interval of a sheet | seat junction part can be determined suitably, it is preferable to define a change degree etc. within the said range.

<Invention of Claim 6>
The sheet joint in the shrinkage reduction region is formed of an adhesive that is continuous in the front-rear direction at least in the shrinkage reduction region,
The elastic elastic member in the shrinkage reduction region is fixed to at least one of the first sheet material and the second sheet material by an adhesive at a position intersecting the sheet bonding portion, and is not fixed between the sheet bonding portions. Being
The pants-type disposable diaper according to claim 4 or 5.

(Function and effect)
As described above, the form in which the sheet joint portion is continuous in the front-rear direction is preferable in that the wrinkles formed at the time of contraction extend in the front-rear direction and have excellent aesthetics. Moreover, if the pattern of the sheet joint portion is changed as described above for such a form, the effect of the present invention described above can be obtained by itself.

<Invention of Claim 7>
The region on the waist opening side of the shrinkage rate lowering region in the stretchable region has an elastic stretchable member for stretching, and an outer sheet layer and an inner sheet layer that cover the outer side and the inner side, respectively.
In the region closer to the waist opening than the shrinkage reduction region in the stretchable region, the outer sheet layer and the inner sheet layer are joined by a sheet joining portion that is intermittently formed in the width direction and continues in the front-rear direction. And the width direction position of the sheet joint portion corresponds to the width direction position of the sheet joint portion in the shrinkage reduction region,
The pants-type disposable diaper according to any one of claims 4 to 6.

(Function and effect)
In this way, when the width direction position of the sheet joint portion in the shrinkage rate reduction region and the width direction position of the sheet joint portion in the region on the waist opening side correspond to each other, wrinkles formed at the time of shrinkage are spread over a wider range in the front-rear direction. It is preferable because it is long and excellent in aesthetics.

<Invention of Claim 8>
The pants-type disposable diaper according to any one of claims 1 to 7, wherein a length in the front-rear direction of the shrinkage reduction region is 50% or less of a total length of the pants-type disposable diaper.

(Function and effect)
If the length is too long in the front-rear direction of the shrinkage rate reduction region, the fit property may be lowered.

<Invention of Claim 9>
The edge of the said leg opening in the said exterior body, and the edge of the waist opening side of the said shrinkage | contraction rate fall area are made into the shape located in a waist opening side as it goes to the side from the said interior body side. The underpants type disposable diaper of any one of these.

(Function and effect)
In pants-type disposable diapers, the edge of the leg opening in the exterior body has a shape that is positioned on the waist opening side as it goes from the interior body side to the side along the circumference of the wearer's leg, In such a form, when the edge on the waist opening side of the shrinkage rate reduction region is positioned along the width direction, the size in the front-rear direction of the shrinkage rate reduction region is reduced toward the side. In that case, if the front-rear direction dimension of the shrinkage rate lowering region is expanded to the full extent in order to sufficiently exert the effect of the shrinkage rate lowering region also on the side portion, the fit property may be lowered. Therefore, as described in this section, the edge on the waist opening side of the shrinkage rate decreasing region also has a shape that is positioned on the waist opening side as it goes from the interior body side to the side, and the shrinkage rate is reduced while suppressing a decrease in fit. It is one preferable form to exert the action of the region widely.

  As described above, according to the present invention, there are advantages such as a pants-type disposable diaper that can easily pass the wearer's leg through the leg opening.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. It is. 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 a front view which shows the underpants type disposable diaper of a natural length state. It is a front view which shows the underpants type disposable diaper of a natural length state. It is the schematic of a shrinkage deformation principle. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. It is. It is a top view which shows the other pattern of a sheet | seat junction part. It is a schematic diagram of adhesion equipment. 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 6-6 sectional drawing of FIG. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper.

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 pants-type disposable diaper 100 includes an exterior body 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior body 12. Symbol Y indicates the total length of the diaper, and symbol X indicates the total width of the diaper.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the joining means which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive.

(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 surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption 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 stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, 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. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of 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.

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

(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 to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of 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 material 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 2.2 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.

(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 has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  Unlike the illustrated example, the liquid-impermeable sheet 11 can be extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 unlike the illustrated example. 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 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up 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 intermediate portion has a width. It stands up diagonally outward in the direction.

  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 elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

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 with excellent uniformity and concealment, and water repellent with silicon 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, and 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. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) 66w is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance 60d between the folds located on the innermost side in a state where the three-dimensional gather 60 is flatly folded so as to be parallel to the surface of the topsheet 30, 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 crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. 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 FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Moreover, although the dimension of the absorber 56 can be determined suitably, it is preferable to extend to the peripheral part of the interior body or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are 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 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

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

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

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

(Exterior body)
The exterior body 12 has a part constituting a front body F extending from the crotch part to the abdomen and a part constituting a rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, the waist opening WO for passing the wearer's torso and the left and right sides for passing the legs are formed. A pair of leg openings LO are formed.

  The exterior body 12 includes a waist part T defined as a front-rear direction range from the waist opening WO to the upper end of the leg opening LO, and a center side in the front-rear direction than the waist part (from the front body F to the back body B as shown in the figure). When the exterior body is integrally formed, a cover portion L extending between the front-rear direction range having the side seal portion 12A of the front body F and the front-rear direction range having the side seal portion 12A of the rear body B is provided. Have. The waistline portion T can be divided into a waist portion W that conceptually forms an edge portion of the waist opening and a waist lower portion U that is a lower portion than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the cover portion L are wrapped around the legs of the adherend. As a result, the exterior body 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior body 12 can be determined as appropriate. In order to obtain a clean appearance as shown in FIGS. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  The shape of the interior body fixing region 12X (the region for fixing the interior body 200) in the exterior body 12 is not particularly limited, and in addition to a rectangular shape as illustrated, the middle in the front-rear direction is similar to the absorber 56. Appropriate changes are possible, such as a constricted shape. The dimension of the interior body fixing region 12X may be the same as the dimension of the interior body 200, but may be shorter than the dimension of the interior body 200 in at least one of the front-rear direction and the width direction. The fixing means for the inner body 200 is assumed to be an adhesive such as a hot-melt adhesive in the illustrated embodiment, but other means may be used.

  As shown in FIGS. 3 to 6, the exterior body 12 is formed by joining two sheet materials 12 </ b> S and 12 </ b> H, and the second sheet material 12 </ b> H located inside is an edge of the waist opening WO. However, the first sheet material 12S located on the outer side wraps around the edge on the waist side of the second sheet material 12H and is folded back to the inner side. It extends so as to cover up to the end on the waist side.

The first sheet material 12S and the second sheet material 12H can be used without any particular limitation as long as they are in sheet form, but are preferably non-woven fabrics, and particularly have a thickness of 0.1 to 1 mm and a basis weight of 10 to 20 g / m, respectively. The nonwoven fabric of ² is preferable. In addition, the 1st sheet material 12S and the 2nd sheet material 12H are each comprised from the nonwoven fabric of one sheet, and either or both may be a laminated body of the nonwoven fabric of several sheets. 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. In particular, at least one of the first sheet material 12S and the second sheet material 12H is a nonwoven fabric of polypropylene (PP) or a copolymer thereof (for example, a copolymer in which polyethylene or ethylene is blended as a copolymerization component) (hereinafter also referred to as a PP-based nonwoven fabric). It is preferable to use a flexible non-woven fabric such as a non-woven fabric of core-sheath fiber (PE / PP) having polyethylene (PE) as a sheath and polypropylene (PP) as a core component. 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. In particular, a spunbonded nonwoven fabric is preferred from the viewpoint of strength and flexibility, and a spunbonded nonwoven fabric obtained by laminating a plurality of spunbond layers, for example, a SS nonwoven fabric (two layers) and a SSS nonwoven fabric (three layers) are suitable. It can be used, and four or more layers can also be used.

  As the first sheet material 12S and the second sheet material 12H, a non-woven fabric is suitable. However, if the bending resistance in the expansion / contraction direction is low in that case, the later-described ridge 80 becomes thin and sharp, and easily collapses. Further, the compression recovery property in the thickness direction is also poor. In order to improve this, it is conceivable to increase the basis weight of the non-woven fabric, but there is a possibility that the softness when touched may be poor even if the appearance is stiff (because the rigidity is improved too much). Therefore, it is preferable that a nonwoven fabric is used as the first sheet material 12S and the second sheet material 12H, and the bending resistance in the stretching direction is higher than the bending resistance in the direction orthogonal to the stretching direction. As a result, the wrinkles 80 described later are easily rounded and swelled, and the compressive recoverability in the thickness direction is enhanced, the collapse is less likely to occur, and the softness when touched is increased. The first sheet material 12S and the second sheet material 12H are each preferably 30-75 mm, more preferably 40-55 mm, in the direction of expansion and contraction. Within the range below the bending resistance, it is preferably 20 to 50 mm, more preferably 25 to 35 mm.

  Here, the bending resistance of the nonwoven fabric means a value measured according to the bending resistance A method (45-degree cantilever method) of JIS L1096: 2010 “Testing method for fabrics and knitted fabrics”.

  In order to make the bending resistance in the direction orthogonal to the stretching direction of the nonwoven fabric less than the bending resistance in the stretching direction, the fiber orientation of the nonwoven fabric may be configured along the stretching direction. Here, the fiber orientation is the direction along which the fibers of the nonwoven fabric are along, and “the fiber orientation is along the stretch direction” means that 100% of the total fiber weight constituting the nonwoven fabric is fiber oriented in the stretch direction. The thing from 50 to 50% or more is what is made to have fiber orientation in the range of -45 degrees-+45 degrees with respect to the expansion-contraction direction. The measurement method generally used can be used for the measuring method of the fiber orientation of a nonwoven fabric. Examples of measurement methods include a measurement method according to the TAPPI standard method T481 fiber orientation test method based on zero-range tensile strength, and a simple measurement that determines the fiber orientation direction from the stretching direction and the tensile strength ratio in the orthogonal direction. A method can be mentioned. In the latter simple measuring method, a test piece having a length of 200 mm and a width of 50 mm is subjected to a tensile test using a tensile tester under the conditions of a crosshead speed of 500 mm / min and a distance between chucks of 150 mm. If the tensile strength is obtained from the maximum load and the ratio of tensile strength (stretching direction / orthogonal direction) is greater than 1, the fiber orientation is assumed to be along the stretching direction.

  On the other hand, the exterior body 12 is provided with elastic stretch members 19 (15 to 17) such as rubber thread between the sheet materials 12S and 12H at a predetermined elongation rate in order to improve the fit to the periphery of the trunk. As the elastic elastic member 19, synthetic rubber or natural rubber may be used. A net-like or sheet-like elastic elastic member can be used instead of the elongated elastic member 19 such as a thread shape or a belt shape. In the case of using an elongated elastic elastic member, its thickness and elongation rate may be appropriately selected according to the mounting position of the elastic elastic member 19, but in normal cases, the thickness is about 300 to 1,000 dtex, and the elongation rate is It is desirable to be about 200 to 350%.

More specifically, the inner surface of the first sheet material 12S (outer sheet layer) in the waist portion W of the back body B and the front body F and the outer surface of the folded portion 12r (inner sheet layer) of the first sheet material 12S. Between them, a plurality of waist elastic elastic members 17 are fixed in a state of being stretched along the width direction at a predetermined elongation rate with a spacing in the front-rear direction so as to be continuous over the entire width direction. . In addition, one or more of the waist elastic elastic members 17 disposed in a region adjacent to the waist lower part U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. 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%. Moreover, the waist part elastic expansion-contraction member 17 does not need to make all the same thickness and expansion | extension rate, For example, you may make it the thickness and expansion | extension ratio of an elastic expansion-contraction member differ in the upper part and lower part of the waist part W.

  Further, an interior body is provided between the inner surface of the first sheet material 12S (outer sheet layer) and the outer surface of the second sheet material 12H (inner sheet layer) in the waist lower portion U of the front body F and the rear body B. Except for the intermediate portion in the width direction of the fixed region 12X, a plurality of waist lower elastic elastic members 15 made of an elongated elastic elastic member 15 are provided so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction, It is fixed in a state of being stretched along the width direction at a predetermined stretch rate with a space in the front-rear direction.

The waist downward resilient and elastic members 15, 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), 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, between the outer side surface of the second sheet material 12H and the inner side surface of the first sheet material 12S in the cover portion L of the front body F and the back body B, except for the intermediate portion in the width direction of the interior body fixing region 12X. A plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction, spaced in the front-rear direction and at a predetermined elongation rate. It is fixed in an extended state along the width direction.

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 addition, as shown in the figure, in the form in which the waist lower elastic elastic member 15 and the cover elastic elastic member 16 are provided on both sides in the width direction except for the intermediate portion in the width direction of the interior body fixing region 12X, the exterior The range in the front-rear direction from the edge on the waist opening WO side of the body 12 to the edge on the waist opening WO side of the interior body fixing region 12X (or even the end on the waist opening WO side) continuously expands and contracts over the entire width direction. The front / rear direction range of the interior body fixing region 12X on the center side in the front / rear direction from the continuous expansion / contraction region is an intermittent expansion / contraction in which at least the middle portion in the width direction of the interior body fixing region 12X is non-stretchable and both sides in the width direction extend / contract. Since it becomes a region, the interior body 200 does not shrink more than necessary in the width direction, and it looks bad and absorbs poorly. No. In this configuration, in addition to the configuration in which the elastic elastic members 19 exist only on both sides in the width direction, the elastic elastic members exist from the one side in the width direction to the other side across the interior body 200. The elastic expansion / contraction member 19 is finely cut at the intermediate portion in the width direction of 12X, and the contraction force does not act (substantially equivalent to the absence of the elastic expansion / contraction member 19), so that the elastic expansion / contraction member 19 becomes non-expandable. A form in which only both sides expand and contract because a contracting force acts is also included.

  Although not shown, the arrangement of the waist elastic member 15 and the cover elastic member 16 is not limited to the above example, and the elastic force acts on the entire width direction including the portion overlapping the interior body 200. As described above, part or all of the waist lower elastic elastic member 15 and the cover elastic elastic member 16 may be provided from one side to the other side in the width direction across the interior body 200. In any form, the region located in the waist portion T of the width direction region corresponding to the leg opening LO is configured as an expansion / contraction region E that expands / contracts in the width direction by the waist lower elastic expansion / contraction member 15, and the cover portion. In the case of having L, a stretchable region E in which the region located in the cover portion L is also stretched in the width direction by the cover portion elastic stretchable member 16 is formed.

(External body split structure)
In the above-described example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but as shown in FIGS. 15 and 16, the exterior body 12F constituting the front body F and the back The exterior body 12B constituting the body B may not be continuous on the crotch side but may be separated. In this case, a crotch portion is formed on the back surface of the interior body 200 so as to cover a portion exposed between the exterior body 12F constituting the front body F and the exterior body 12B constituting the back body B, of the outer surface of the interior body 200. The exterior body 12M can also be attached. As the crotch outer body 12M, the same material as that used for the outer body 12 described above can be used.

(Expansion structure of shrinkage reduction region)
In the conventional pants-type disposable diaper, as shown in FIG. 9, since almost the entire stretchable region E is greatly contracted in the width direction, the width of the leg opening LO is narrowed and the wearer's leg is turned into the leg opening LO. It becomes difficult to pass. On the other hand, in the present invention, the natural length increases toward the leg opening LO side toward the leg opening LO side in the expansion / contraction region E, as shown in FIG. A shrinkage rate lowering region D in which the shrinkage rate in the width direction of the state decreases continuously or stepwise is formed.

  Also in the form shown in FIG. 10, in the natural length state, the leg opening LO becomes narrow to some extent due to contraction in the width direction. However, in this embodiment, a contraction rate lowering region D in which the contraction rate in the width direction in the natural length state decreases continuously or stepwise as it goes toward the leg opening LO side is formed in the portion on the leg opening LO side in the stretchable region E. Therefore, in this contraction rate lowering region D, the contraction amount on the leg opening LO side is reduced as shown in the deformation image shown in FIG. 11, and the leg opening LO is much wider than before as shown in FIG. It is easy to pass the wearer's leg through the leg opening LO. In addition, the entire stretchable region E is not simply set as the shrinkage rate decreasing region D, but the low stretchable region E is provided in the portion on the leg opening LO side. On the contrary, in the case of a wearer whose legs are thick from the base of the legs to the thighs, the fit around the legs is preferable.

  Means for lowering the contraction rate in the width direction in the natural length state in the shrinkage rate reduction region D continuously or stepwise is not particularly limited. For example, the elastic elastic member 19 (in the illustrated form, the waist) Even if the elongation rate at the time of fixing the elastic elastic member 17) is lowered from the waist opening WO side toward the leg opening LO side, it is possible to continuously or stepwise reduce the widthwise contraction rate in the natural length state. it can. However, it is not easy to reduce the elongation rate at the time of fixation without reducing the fit. Therefore, when the elastic elastic member 19 is sandwiched between the first sheet material 12S (outer sheet layer) and the second sheet material 12H (inner sheet layer) in the shrinkage reduction region D as in the outer package 12 of the present embodiment. The first sheet material 12S and the second sheet material 12H in the shrinkage rate reduction region D are joined by the sheet joining part 70 formed intermittently in the width direction, and the width of the sheet joining part 70 is set to the leg opening. It is preferable to increase the width continuously or stepwise toward the LO side. As described above, when the widths of the individual sheet joint portions 70 in the shrinkage rate lowering region D are changed, the widthwise shrinkage rate in the natural length state in the shrinkage rate lowering region D is continuously or gradually increased toward the leg opening LO. Can be lowered. In addition, when the sheet | seat joining part 70 is intermittently formed in the width direction as in this embodiment, the first sheet material 12S and the second sheet are contracted as shown in FIG. The portions located between the sheet joining portions 70 in the material 12H contract, and swell 80 in opposite directions to form the flange 80. FIG. 6B shows a natural length state, but when mounted, the elastic elastic member 19 is extended to a certain extent from this state, and as shown in FIG. The height of becomes lower.

  When changing the width of the sheet joint portion 70 in the shrinkage rate reduction region D, the shape of the sheet joint portion 70 is not particularly limited. For example, as shown in FIGS. And a triangular shape having a vertex on the waist opening WO side, a pentagonal shape as shown in FIG. 13 (c), or a semi-elliptical shape as shown in FIG. 13 (d).

  Although the width | variety of the sheet | seat junction part 70 in the shrinkage | contraction rate fall area | region D and a space | interval can be defined suitably, the width | variety 70w of each sheet | seat junction part 70 is 4-13 mm in maximum width, and is 0-2 mm in minimum width, In addition, the maximum width is preferably 5 times or more, particularly 8 to 15 times the minimum width, and the interval 70d between the adjacent sheet joining portions 70 is 6 to 13 mm at the maximum interval and 0 to 5 mm at the minimum interval. And the maximum interval is preferably at least twice the minimum interval, particularly 3 to 10 times.

  The shrinkage rate reduction region D may be the entire width direction of the stretchable region E as shown in the figure, or may be a part of the width direction of the stretchable region E. In this case, the width direction is smaller than the inner side in the width direction. The outside is preferable.

  As long as the contraction rate reduction region D is a portion on the leg opening LO side in the expansion / contraction region E, for example, the contraction rate decrease region D can be provided only in the cover portion L (not shown) without being provided in the waist portion T. In addition, it is preferably provided from the middle in the front-rear direction of the waistline T (from the center in the longitudinal direction of the waistline T to the leg opening LO side in order to prevent a decrease in fit) to the cover L. In particular, if the shrinkage rate reduction region D is too long in the front-rear direction, the fit may be reduced. Therefore, the length of the shrinkage rate reduction region D is 50% or less of the total length Y of the pants-type disposable diaper, particularly 5 It is desirable to set it to -30%.

  On the other hand, as in the illustrated embodiment, in the pants-type disposable diaper, the edge of the leg opening LO in the exterior body 12 extends toward the waist opening WO as it goes sideways from the interior body 200 side along the circumference of the wearer's leg. Although there are some which are made into the shape of a curve or a straight line located, in such a form, if the edge by the side of the waist opening WO of shrinkage rate fall area D is located along the width direction, shrinkage rate fall area D of It shrinks as the front-back dimension goes to the side. In that case, in order to fully exhibit the effect | action of the shrinkage | contraction rate fall area | region D also in a side part, when the front-back direction dimension of the shrinkage | contraction rate fall area | region D is expanded as a whole, there exists a possibility that fit property may fall. Therefore, as shown in FIG. 17, it is also preferable that the edge De on the side of the waist opening WO of the shrinkage rate reduction region D is also located on the side of the waist opening WO as it goes from the interior body 200 side to the side. It is a form. Thereby, it is possible to extend along the edge of the leg opening LO while ensuring the dimension in the front-rear direction of the shrinkage rate lowering region D, and to exhibit a wide range of actions of the shrinkage rate lowering region D while suppressing a decrease in fit. Can be made.

(Expansion structure in areas other than shrinkage reduction areas)
In the present embodiment, the stretchable structure other than the shrinkage rate lowering region D in the stretchable region E is not particularly limited, and any known structure can be applied, but from the viewpoint of ease of manufacture, the same stacking as the shrinkage rate lowering region D A structure (a sheet joining structure and a structure for fixing the elastic elastic member 19) is preferable. For example, as in the present embodiment, in the case where the sheet joint portion 70 in the shrinkage rate reduction region D is intermittently formed in the width direction, the same width direction also in the region C on the waist opening side of the shrinkage rate reduction region D It is preferable to form the sheet bonding portion 70 at a position because the ridge 80 formed at the time of contraction extends in the front-rear direction over a wider range and becomes excellent in aesthetic appearance. The sheet joint portion 70 in the shrinkage reduction region D and the sheet joint portion 70 in the region C on the waist opening side may be discontinuous, but in a form in which the sheet joint portion 70 is continuous in the front-rear direction as shown in the figure. It is more preferable that the sheet bonding portion 70 in the shrinkage rate decreasing region D and the sheet bonding portion 70 in the region C on the waist opening side are continuous.

  Also in the region C on the waist opening side, in the same manner as the shrinkage rate lowering region D, in the first sheet material 12S and the second sheet material 12H in accordance with the contraction of the elastic stretch member 19 (the waist lower elastic stretch member 15 in the illustrated embodiment). The portions located between the sheet joining portions 70 are contracted and swelled in opposite directions to form the flange 80. At the time of mounting, the elastic elastic member 19 is extended to a certain extent, the skirt of the heel 80 is expanded, and the height of the heel 80 is lowered accordingly.

  The shape of the sheet bonding portion 70 in the region C on the waist opening side can be determined as appropriate, and can be a curved shape or a diagonal shape, but is preferably a linear shape along the front-rear direction.

  Although the width | variety of the sheet | seat junction part 70 in the area | region C by the side of a waist opening can be determined suitably, it is preferable that the width 70w of each sheet | seat junction part 70 shall be 0.5-4 mm. The lower limit of the width 70w in the expansion / contraction direction of the sheet joining portion 70 is preferably 1 mm from the viewpoint of ease of manufacture, but is preferably 0.5 mm from the viewpoint of flexibility. On the other hand, the upper limit of the width 70w in the expansion / contraction direction of the sheet bonding portion 70 is preferably 2 mm, and more preferably 1.5 mm. Although it may change in the width | variety and the front-back direction of the sheet | seat junction part 70, it is desirable not to change like the illustration form.

  Moreover, although the space | interval of the elastic elastic member 19 which adjoins in the area | region C by the side of a waist opening can be determined suitably, since the thickness of the collar 80 will change in the direction which cross | intersects an expansion-contraction direction when it exceeds 10 mm, It is preferably 10 mm or less, particularly 3 to 7 mm.

  The width 70w in the expansion / contraction direction of each sheet joining portion 70 affects the interval between adjacent ridges 80. When the ridge 80 formed is thin in the region C on the waist opening side, the width exceeds 4 mm. In addition to the fact that the space between the adjacent ridges 80 becomes too wide and the individual ridges 80 look independent, the adjacent ridges 80 are deformed when the ridges 80 are crushed and collapsed by the compressive force in the thickness direction. As a result of the weaker supportive action, the resistance to deformation or the restoration after the change also becomes weak, and as a result, the sense of funiness becomes insufficient.

  Moreover, in the region C on the waist opening side, the width 70w in the expansion / contraction direction of the sheet joining portion 70 is simply set to 0.5 to 4 mm, and the interval 70d between adjacent sheet joining portions 70 is less than 4 mm or more than 8 mm. Is as follows. That is, the interval 70d between the adjacent sheet bonding portions 70 affects the height and width of the flange 80, and the vertical direction is the same as when the interval between adjacent sheet bonding portions is about 2 mm and is continuously fixed in the expansion / contraction direction.襞 80 with poor continuity (there is no need to intermittently provide the sheet joint portion 70 in the width direction). At 3 mm, the heel 80 extends straight in the direction perpendicular to the expansion and contraction direction, but adjacent ridges 80. Can not be expected to support each other, the lack of fun feeling. Moreover, in the area | region C by the side of a waist opening, when the space | interval 70d of the sheet | seat junction part 70 exceeds 8 mm, the collar 80 will be crushed irregularly by the compression at the time of packaging, and the appearance of a product will worsen. On the other hand, in the region C on the waist opening side, it is sufficient only when the width 70w in the expansion / contraction direction of the sheet bonding portion 70 is 0.5 to 4 mm and the interval 70d of the sheet bonding portion 70 is 4 to 8 mm. A smooth feeling is obtained, and the wrinkles 80 are not easily crushed irregularly by compression during packaging.

  The elongated elastic elastic member 19 in the region C on the waist opening side and the elongated elastic elastic member 19 in the shrinkage rate lowering region D have the same or thinner thickness, or the same or lower elongation rate when fixed. However, in order to compensate for the decrease in fit due to the provision of the shrinkage rate lowering region D, a part of the elongated elastic elastic member 19 in the region C on the waist opening side (particularly, the shrinkage rate lowering region) It is also a preferred form that the (D side) or the whole is made thicker than the elongated elastic elastic member 19 in the shrinkage rate lowering region D or the elongation rate at the time of fixation is increased.

(Sheet joint)
As long as the sheet joining portion 70 can join the outer sheet layer and the inner sheet layer (the first sheet material 12S and the folded portion 12r thereof, and the first sheet material 12S and the second sheet material 12H), as shown in the illustrated embodiment, In addition to using the adhesive 71 such as an adhesive, it is also possible to use welding means for joining by material welding of the outer sheet layer and the inner sheet layer, such as heat sealing and ultrasonic sealing. However, in the form in which the sheet joining portion 70 is continuous in the front-rear direction as shown in the figure, if the sheet joining portion 70 is formed by welding, a hard streak may be formed and flexibility may be reduced, whereas adhesion When the sheet joining portion 70 is formed by the agent 71, the flexibility is not lowered due to the material welding, and the flexibility is further improved.

  In addition to making the sheet joining portion 70 continuous in the front-rear direction, it is possible to join only the position intersecting with the elastic elastic member 19 or the position not intersecting and intermittent in the front-rear direction. In particular, as shown in the figure, the sheet joining portion 70 is continued in the front-rear direction, and the elastic elastic member 19 is placed on at least one of the first sheet material 12S and the second sheet material 12H at a position intersecting the sheet joining portion 70. Fixing and non-fixing between the sheet joining portions 70 is preferable in that the ridges 80 formed at the time of contraction extend in the front-rear direction and have excellent aesthetics. Even if the sheet bonding portion 70 is continuous in the front-rear direction or intermittently, if the sheet bonding portion 70 is located at the edge on the waist opening WO side, it is easy to hit the skin. The edge of the seat joint 70 on the side of the waist opening WO is desirably separated from the edge on the side of the waist opening WO toward the center in the front-rear direction.

  When the sheet bonding portion 70 is formed by the adhesive 71, a hot melt adhesive is preferably used as the adhesive 71. There are various types of hot melt adhesives, such as EVA, adhesive rubber (elastomer), olefin, polyester / polyamide, and can be used without particular limitation. It is desirable to use it.

  The application method of the hot melt adhesive 71 is not particularly limited. However, when the thin sheet joint portion 70 having a width of 70 w is intermittently formed in the width direction as illustrated, the application width of the hot melt adhesive is not limited. The pattern coating (transfer of the hot-melt adhesive 71 in the relief printing method) suitable for narrow width coating is adopted because it is difficult to apply by intermittent coating by a coating method sprayed from a nozzle such as a curtain or a solid. It is desirable. FIG. 14 shows an example of a production facility for a stretchable structure when a pattern coat of a hot melt adhesive is used. That is, in this pattern coat type equipment example, the elastic elastic member 19 is sandwiched between the second sheet material 12H and the first sheet material 12S having the hot melt adhesive 71 applied to the surface on the second sheet material 12H side. Thus, it is fed between a pair of nip rolls 101 and pressed to form the stretchable structure shown in FIG. Before the first sheet material 12S is fed into the nip roll 101, the first sheet material 12S is brought into contact with the plate roll 102 having an intermittent convex pattern in the circumferential direction, and intermittently in the transport direction (MD direction, which is the direction of expansion and contraction). In addition, the hot melt adhesive 71 is transferred and applied continuously in a direction (CD direction) intersecting the transport direction. Instead of applying the hot melt adhesive to the first sheet material 12S, or together with this, the hot melt adhesive can be applied to the second sheet material 12H by the same application method. Reference numeral 103 in the figure denotes a hot melt adhesive supply roll (anilox roll in letterpress printing) for transferring and applying the hot melt adhesive 71 to the convex pattern of the plate roll 102 at a predetermined thickness. A supply nozzle 104 supplies the hot melt adhesive 71 to the hot melt adhesive supply roll 103.

(Fastening elastic elastic member)
In addition to fixing both ends in the width direction, the elastic elastic member 19 can be fixed at an appropriate interval in the width direction, or can be fixed in the entire width direction.

  As a means for fixing the elastic elastic member 19, in addition to the adhesive 71 such as a hot melt adhesive, a material welding means such as a heat seal or an ultrasonic seal can be used. In the case where the sheet joint portion 70 is provided at a position intersecting with the elastic expansion / contraction member 19 in addition to being dedicated, a means for forming the sheet joint portion 70 is used (that is, formation of the sheet joint portion 70 and the elastic expansion / contraction member 19). Can also be fixed).

  For example, as shown in FIGS. 6 and 12, the elastic elastic member 19 can be fixed to at least one of the first sheet material 12 </ b> S and the second sheet material 12 </ b> H with an adhesive 71 at a position intersecting the sheet joint portion 70. it can. In order to fix the elastic elastic member 19, an adhesive different from that for forming the sheet bonding portion can be applied to the elastic elastic member or the first sheet material 12S and the second sheet material 12H. Since the adhesive 71 for forming the portion 70 is continuous in the direction intersecting with the expansion / contraction direction, the elastic expansion / contraction member 19 is made of at least one of the first sheet material 12S and the second sheet material 12H using the adhesive 71. It is fixed on one side. In manufacturing, the adhesive 71 may be applied to one or both of the first sheet material 12S and the second sheet material 12H, and the elastic elastic member 19 may be sandwiched between the two layers when the two layers are bonded together.

  In the form shown in FIG. 6, the adhesive 71 is applied to the inner surface of the first sheet material 12S intermittently in the width direction and continuously with a predetermined width in the direction intersecting the expansion and contraction direction. On the outer surface of 12H, without applying the adhesive 71, the elastic elastic member 19 is sandwiched between the first sheet material 12S and the second sheet material 12H in an expanded state, and the first sheet material 12S and the second sheet material 12H, In addition, the first sheet material 12S and the elastic elastic member 19 are joined by an adhesive 71, respectively. In this case, among the portions where the sheet joint portion 70 and the elastic stretchable member 19 intersect, the elastic stretchable member 19 becomes the first sheet by the adhesive 71 being continuous outside the elastic stretchable member 19 in the direction intersecting the stretchable direction. While being fixed to the material 12S, the adhesive 71 is discontinuous in the direction intersecting the expansion / contraction direction inside the elastic expansion / contraction member 19. In the figure, this discontinuous portion is indicated by reference numeral 72. Since the adhesive 71 is intermittently present in the second sheet material 12H, the decrease in flexibility of the second sheet material 12H, and thus the decrease in flexibility of the first sheet material 12S and the second sheet material 12H as a whole is suppressed. it can. Further, the elastic elastic member 19 is continuous with the adhesive 71 only on the outer side at the portion intersecting with the sheet joining portion 70, but the first sheet material 12 </ b> S and the second sheet material 12 </ b> H are formed on both sides of the elastic elastic member 19 by the sheet joining portion 70. Therefore, the contraction force of the elastic elastic member 19 acts substantially the same on the first sheet material 12S and the second sheet material 12H, and is equivalent to both the first sheet material 12S and the second sheet material 12H. Can be formed.

  In addition, it is also possible to apply the adhesive 71 in the same pattern to the first sheet material 12S and the second sheet material 12H. In this case, as shown in FIG. 12, among the portions where the sheet joining portion 70 and the elastic stretchable member 19 intersect, the adhesive 71 is predetermined in a direction intersecting the stretchable direction both inside and outside the elastic stretchable member 19. Therefore, there is an advantage that the elastic elastic member 19 can be fixed more firmly. In addition, although not shown, it is also possible to apply an adhesive to the second sheet material 12H and fix the first sheet material 12S by sandwiching an elastic stretchable member without applying the adhesive.

(Other)
When the sheet joint portion 70 is intermittently formed in the width direction, a decrease in the fixing force of the elastic elastic member 19 is unavoidable, and the elastic elastic member 19 may come off. In particular, when the width 70w in the expansion / contraction direction of each sheet bonding portion 70 is narrow, the position where the elastic expansion / contraction member 19 and the sheet bonding portion 70 intersect becomes small, and it is necessary to fix the elastic expansion / contraction member 19 at this small position. It is important to secure the fixing force of the elastic elastic member 19.

  Therefore, it is also a preferable form to narrow the interval between the sheet joining portions 70 or widen the width of the sheet joining portions 70 stepwise or continuously toward the side edge of the diaper.

<Effect confirmation test>
As shown in Table 1, three types of pants-type disposable diaper samples that differ only in the form of the sheet joint were prepared, and a sensory evaluation was performed on the photography of the leg opening and the ease of passing the leg through the leg opening.

Example 1 is a sample having the same structure as that shown in FIGS. 1 to 8, the length of the side seal portion 12A in the front-rear direction is 120 mm, and the length of the cover portion L in the front-rear direction is 210 mm. The ratio of the length in the front-rear direction of the side seal portion 12A with respect to Y is 36%. The maximum width of the sheet bonding portion 70 in the contraction force reduction region is 10 mm, the minimum width is 1 mm, the maximum interval is 9 mm, and the minimum interval is 0 mm. They are provided with an equal width of 2 mm and at an equal interval of 6 mm. Further, in this embodiment, the elastic elastic members of the respective parts are provided at the thicknesses, elongation rates, numbers, and intervals shown in Table 1. The first sheet material 12 </ ^b > S and the second sheet material 12 </ ^b > H in the present embodiment are each 17 g / m ² of non-woven fabric, and the sheet bonding portion 70 is formed of a hot melt adhesive 71.

  Example 2 is the same as Example 1 except that a part of the waist lower elastic elastic member U, which is an elongated elastic elastic member in the waist opening side region from the shrinkage rate decreasing region, is thickened. did.

  The comparative example was different from the examples (structure widely used in commercial products) only in that the first sheet material 12S and the second sheet material 12H were joined together by solid application of the hot melt adhesive 71.

  For observation of the state of the leg opening, the sample was placed on a flat surface in a natural length state, and an external photograph was taken from the front body side. A 500 ml (90 mm diameter) beaker was placed upside down in the diaper, the edge of the mouth of the beaker was aligned with the base of the three-dimensional gather, and an internal photograph was taken from above.

  The sensory evaluation was performed by having 30 test subjects look at each sample, evaluating the ease of passing the leg through the leg opening with 1 to 5 points (relative evaluation when the comparative example was 3 points), and the average value Was the evaluation result.

  The results of photography and sensory evaluation are shown in Table 1. In Examples 1 and 2 according to the present invention, compared with the comparative example, the leg opening is open, and the sensory evaluation on the ease of passing the leg is also high.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

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

  -"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer 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, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / 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 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. .

  The present invention is suitable for a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12H ... 2nd sheet material, 12S ... 1st sheet material, 12r ... Folded part, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... absorbent element, 56 ... absorbent, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 70 ... sheet joint, 71 ... adhesive, 80 ... wrinkle, WO ... waist opening, 12X ... Inner body fixing region, W: waist portion, U: waist lower portion, L: cover portion, LO ... leg opening, T ... waistline portion, 17 ... waist elastic elastic member, 19 ... elastic elastic member, 15 ... lower waist portion Part elastic elastic member, 16 ... cover elastic elastic member, D ... shrinkage reduction region, E ... elastic region, C ... waist opening side region.

Claims (9)

An exterior body that configures the front body and the back body individually or integrally, and an interior body including an absorbent body fixed to the inner surface of the exterior body,
By forming both side portions of the exterior body in the front body and both side portions of the exterior body in the back body to form side seal portions, a waist opening and a pair of left and right leg openings are formed,
The exterior body is an expansion / contraction region in which at least the region on the leg opening side in the width direction region corresponding to the leg opening extends and contracts in the width direction,
A shrinkage rate lowering region in which the widthwise contraction rate in the natural length state decreases continuously or stepwise as it goes toward the leg opening side in the portion on the leg opening side in the stretchable region is formed.
A pants-type disposable diaper characterized by that. The exterior body includes at least one of a front body and a back body, a waist part corresponding to the side seal part and a front-rear direction range, and a cover part that is a front-rear direction range on the center side in the front-rear direction than the waist part. And
The stretchable region is provided over the waist portion and the cover portion,
The shrinkage rate reduction region is provided from the middle in the front-rear direction of the waist portion to the cover portion.
The pants-type disposable diaper according to claim 1. The stretchable region includes an elongated elastic stretchable member for imparting stretchability to the shrinkage rate lowering region and the waist opening side region than the shrinkage rate region,
The elongated elastic elastic member in the region on the waist opening side of the shrinkage rate lowering region is thicker than the elongated elastic elastic member in the shrinkage rate lowering region or has a higher elongation rate when fixed.
The pants-type disposable diaper according to claim 1 or 2. The stretchable region of the exterior body has an elastic stretchable member for stretching and an outer sheet layer and an inner sheet layer that cover the outer side and the inner side, respectively.
The outer sheet layer and the inner sheet layer in the stretchable region are joined by a sheet joining portion formed intermittently in the width direction,
The width of the sheet joint portion in the shrinkage reduction area is continuously or stepwise widened toward the leg opening side.
The underpants type disposable diaper of any one of Claims 1-3. The width of the sheet joint portion in the shrinkage reduction region has a maximum width of 4 to 13 mm, a minimum width of 0 to 2 mm, and a maximum width of 5 times or more the minimum width,
The interval between adjacent sheet joints in the shrinkage reduction region is such that the maximum interval is 6 to 13 mm, the minimum interval is 0 to 5 mm, and the maximum interval is at least twice the minimum interval.
The pants-type disposable diaper according to claim 4. The sheet joint in the shrinkage reduction region is formed of an adhesive that is continuous in the front-rear direction at least in the shrinkage reduction region,
The elastic elastic member in the shrinkage reduction region is fixed to at least one of the first sheet material and the second sheet material by an adhesive at a position intersecting the sheet bonding portion, and is not fixed between the sheet bonding portions. Being
The pants-type disposable diaper according to claim 4 or 5. The region on the waist opening side of the shrinkage rate lowering region in the stretchable region has an elastic stretchable member for stretching, and an outer sheet layer and an inner sheet layer that cover the outer side and the inner side, respectively.
In the region closer to the waist opening than the shrinkage reduction region in the stretchable region, the outer sheet layer and the inner sheet layer are joined by a sheet joining portion that is intermittently formed in the width direction and continues in the front-rear direction. And the width direction position of the sheet joint portion corresponds to the width direction position of the sheet joint portion in the shrinkage reduction region,
The pants-type disposable diaper according to any one of claims 4 to 6.   The pants-type disposable diaper according to any one of claims 1 to 7, wherein a length in the front-rear direction of the shrinkage reduction region is 50% or less of a total length of the pants-type disposable diaper.   The edge of the leg opening in the exterior body is shaped to be located on the waist opening side as it goes sideways from the interior body side, and the leg opening while the shrinkage reduction area maintains a predetermined front-rear dimension. The underpants type disposable diaper of any one of Claims 1-8 extended along the edge of.