JP6347826B2 - Pants-type disposable diaper - Google Patents

Description

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

  The pants-type disposable diaper includes an exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body that is attached to the exterior body so as to extend from the front body to the back body, Generally, a waist opening and a pair of left and right leg openings are formed 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 to form a side seal part. Is.

  In such a pants-type disposable diaper, in order to improve the fit to the body, the exterior body has a laminated structure having a plurality of sheet layers, and various elastic members are attached in an expanded state between the sheet layers. In particular, an elongated elastic member along the width direction is provided in the front-rear direction in the waist region defined as the front-rear direction range corresponding to the side seal portion and the intermediate region located between the front and rear waist regions. What is attached in a state of being extended in the width direction at intervals is relatively high in fit to the body (see, for example, Patent Documents 1 to 5).

  On the other hand, in pants-type disposable diapers, it is known to provide decorative printing such as characters and patterns so as to be visible from the outer surface of the product. Such decorative printing is performed on a dedicated printing sheet provided between the sheet layers in the exterior body or between the exterior body and the interior body (see, for example, Patent Documents 1 to 6), and a liquid that covers the back side of the absorbent element Application to an impermeable sheet (see, for example, Patent Documents 7 and 8) is also performed.

  However, in the former case, since the decorative printing is close to the outer surface of the product, it can be visually recognized more clearly, but it is necessary to provide a dedicated sheet. On the other hand, the latter need not be provided with a dedicated sheet and can provide decorative printing over a wide range, but the decorative printing is visually recognized through a plurality of sheet layers particularly in an area overlapping with the exterior body. Decreases.

JP 2004-073428 A JP-T-2006-525857 JP 2011-147516 A JP 2014-028308 A Japanese Patent No. 4964993 JP 2001-047878 A JP-T-2001-517098 JP 2005-315651 A

  Therefore, a main problem of the present invention is to improve the visibility of decorative printing without using a dedicated decorative printing sheet.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
An exterior body that constitutes at least the waist area of the front body and at least the waist area of the back body, and an interior body that incorporates an absorption element attached to the exterior body so as to extend from the front body to the back body,
The exterior body includes an elastic member, an inner sheet layer adjacent to the inner side of the elastic member, and an outer sheet layer adjacent to the outer side of the elastic member,
The both sides of the outer body of the front body and the both sides of the outer body of the back body are joined, respectively, and a waist opening and a pair of left and right leg openings are formed,
In pants-type disposable diapers,
At least the widthwise intermediate portion of the interior body is a portion that does not have a liquid-impermeable sheet outside the absorbent element,
It has a liquid-impermeable sheet made of a resin film that passes outside the outer sheet layer in the exterior body and covers the entire portion of the interior body that does not have the liquid-impermeable sheet,
The liquid-impermeable sheet is decorated with a decorative print,
The entire outer surface of the liquid-impermeable sheet is covered with a cover sheet made of a nonwoven fabric.
A pants-type disposable diaper characterized by that.

(Function and effect)
In this first aspect, a liquid-impermeable sheet, which has conventionally been provided in an interior body, is moved to the outside of the exterior body, and the outside is further covered with a cover sheet so that the product is a cloth. It is characterized by its outer surface. As a result, when decorative printing is provided on the liquid-impermeable sheet, not only is it unnecessary to use a dedicated decorative printing sheet, but the decorative printing is close to the outer surface of the product and can be visually recognized more clearly.

<Second aspect>
Both side edges of the cover sheet are positioned closer to the center in the width direction than the positions of both side edges of the absorbent element, and the inner surface of the cover sheet is opposed to at least both side edges in the region excluding the front and rear ends. Bonded to the surface via hot melt adhesive,
The underpants type disposable diaper of a 1st aspect.

(Function and effect)
If the side edge of the cover sheet is located in a portion with low rigidity or is easily deformed, it may be peeled off even if it is adhered to the opposing surface. Moreover, when the side edge part of a cover sheet tends to rub against a wearer's leg, there exists a possibility that a possibility of peeling may become higher and a level | step difference may worsen the touch. On the other hand, in the second aspect, the side edge portion of the cover sheet is located in the region having the absorption element, that is, the region that is higher in rigidity and less susceptible to deformation and the wearer's leg is less likely to be rubbed. Therefore, the adhesion to the facing surface is difficult to peel off and the touch is difficult to deteriorate. Moreover, since the side edge part of the cover sheet | seat is adhere | attached on the opposing surface, a boundary integrates seamlessly and it does not stand out.

<Third Aspect>
The inner sheet layer and the outer sheet layer are nonwoven fabrics,
The fiber orientation of the inner sheet layer, outer sheet layer and cover sheet is in the width direction,
The underpants type disposable diaper of a 2nd aspect.

(Function and effect)
Thus, when the fiber orientation of the inner sheet layer, the outer sheet layer, and the cover sheet is the same in the width direction, the longitudinal and transverse tensile elongation (or the aspect ratio of the tensile elongation) is close, so that deformation occurred during use. When the inner sheet layer, the outer sheet layer, and the cover sheet can be integrally deformed, the seam between the overlaid cover sheet and the exterior body is not noticeable, and the side edges of the cover sheet are difficult to peel off. Become.

<Fourth aspect>
The cover sheet extends toward the waist opening at least one of the front body and the back body, and is folded back to the inner side of the inner sheet layer at the waist opening.
The underpants type disposable diaper of any one aspect of 1st-3rd.

(Function and effect)
The front and rear edges of the cover sheet are not exposed on the outer surface of the product, and the appearance is improved. Further, it is difficult for the front and rear edges of the cover sheet to rub against and peel off from the clothing.

<Fifth aspect>
The exterior body has a non-stretchable region provided in a width direction intermediate portion of a region overlapping with the absorbent element, and a stretchable region provided on both sides in the width direction of the non-stretchable region,
The cover sheet is provided within a range in the width direction of the non-stretchable region,
The underpants type disposable diaper of any one aspect of the 1st-4th.

(Function and effect)
Thus, when the cover sheet is provided in the width direction range of the non-stretchable region, there are few wrinkles throughout the cover sheet, and the aesthetic appearance is excellent. On the other hand, when the cover sheet extends to the stretchable region, shrinkage folds are also formed on the cover sheet, so that the side edges of the cover sheet are easily peeled off, or wrinkles are noticeable and unnatural appearance. Or

<Sixth aspect>
The outer sheet layer is a nonwoven fabric,
The positions of both side edges of the liquid-impermeable sheet coincide with the positions of both side edges of the cover sheet;
The inner surface of the cover sheet is bonded to the liquid-impermeable sheet through a hot-melt adhesive in the region excluding the front and rear ends thereof, and at least both side ends.
The inner surface of the liquid-impermeable sheet is bonded to the exterior body through a hot-melt adhesive in the region excluding the front and rear ends,
The underpants type disposable diaper of any one aspect of 1st-5th.

(Function and effect)
In this case, both end portions of the cover sheet are bonded to the outer sheet layer made of non-woven fabric through the liquid-impermeable sheet made of resin film. Become strong.

<Seventh aspect>
As the exterior body, a front exterior body constituting at least a waist part of the front body and a rear exterior body constituting at least a waist part of the back body are separately provided, and the front exterior body and the rear exterior body are front and rear. Separated in the front-rear direction in the middle of the direction,
The underpants type disposable diaper of any one aspect of the 1st-6th.

(Function and effect)
The position where the front exterior body and the rear exterior body are separated from each other in the front-rear direction corresponds to a urine supply position, and is an area where leakage prevention is particularly important. In the present invention, the liquid-impermeable sheet is located outside the exterior body, but in such an exterior two-part structure, the interior body is located at a position where the front exterior body and the rear exterior body are separated in the front-rear direction. Since the portion having no liquid-impermeable sheet can be covered with the liquid-impermeable sheet without going through the exterior body, urine hardly penetrates into the exterior body and oozes out to the outside. Furthermore, since the cover sheet is provided over the front side exterior body and the rear side exterior body, the appearance and the touch are continuous over the front side exterior body and the rear side exterior body. Therefore, the present invention is suitable for combination with such an exterior two-part structure.

<Eighth aspect>
The cover sheet is a perforated nonwoven fabric provided with a large number of holes penetrating the front and back at intervals,
The underpants type disposable diaper of any one aspect of 1st-7th.

(Function and effect)
When the cover sheet is such a perforated nonwoven fabric, not only the air permeability, flexibility, bulkiness (softness) and the like can be improved, but also the decorative printing of the liquid-impermeable sheet becomes easy to see.

  As described above, according to the present invention, there is an advantage that the visibility of decorative printing can be improved without using a dedicated decorative printing sheet.

It is a top view which shows the inner surface of the underpants type disposable diaper of an expansion | deployment state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. It is 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. (A) 4-4 sectional drawing of FIG. 1 and (b) 5-5 sectional drawing of FIG. It is a perspective view (hole omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of the expansion | deployment state. It is a top view which shows the outer surface of the interior body of a unfolded state with the outline of an exterior body. (A) 4-4 sectional drawing of FIG. 1 and (b) 5-5 sectional drawing of FIG. It is 2-2 sectional drawing of FIG. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 cross-sectional view of FIG. 12, and (b) it is a 5-5 cross-sectional view of FIG 2. It shows the hole of the perforated nonwoven, (a) a perspective view, (b) a plan view, and (c) 8 - is an 8 sectional view. It shows the hole of the perforated nonwoven, (a) a perspective view, (b) a plan view, and (c) 8 - is an 8 sectional view. It shows the hole of the perforated nonwoven, (a) a perspective view, (b) a plan view, and (c) 8 - is an 8 sectional view. It is a principal part enlarged plan view of a perforated nonwoven fabric. It is (a) (c) sectional drawing of the adhesion part of a cover sheet, (b) (d) Top view. It is a top view which shows the change at the time of application | coating of a hot-melt-adhesive. It is the top view which shows the change of the assembly state of (a) manufacturing equipment of a pants type disposable diaper, and (b) assembly state. (A) An exploded view showing a main part of a conventional laminated structure, and (b) an exploded view showing a main part of the laminated structure of the present invention. It is an exploded view showing the principal part of the laminated structure of the present invention.

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

  1-8 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper passes through the crotch part from the front exterior body 12F constituting at least the waist part of the front body F, the rear exterior body 12B constituting at least the waist part of the rear body B, and the front exterior body 12F. And an interior body 200 containing the absorption element 50 attached to the exterior bodies 12F and 12B so as to extend to the rear exterior body 12B, and both sides of the front exterior body 12F and the rear exterior body 12B. By joining the both side portions to form the side seal portion 12A, the opening formed by the front and rear end portions of the exterior bodies 12F and 12B becomes the waist opening WO through which the wearer's body passes, and the width direction of the interior body 200 On both sides, portions surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 are leg openings LO through which the legs pass. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are support bodies that have a function of supporting the interior body 200 with respect to the wearer's body. The symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the deployed state. The full width of is shown.

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

(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 an absorbent element 50 and a liquid-permeable top sheet 30 that covers the front side of the absorbent element, and is a main body that assumes an absorbent 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 extends from both sides of the interior body 200 so as to contact the circumference of the wearer's leg in order to prevent excrement from leaking to both sides of the interior body 200.

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

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

  Both side portions of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

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

(Intermediate sheet)
In order to make the liquid which permeate | transmitted the top sheet 30 transfer to an absorber rapidly, the intermediate | middle sheet (it is also called a second sheet) 40 whose liquid permeation | transmission speed is faster than the top sheet 30 can be provided. The intermediate sheet 40 is for quickly transferring the liquid to the absorber to improve the absorption performance by the absorber, and to prevent a reverse phenomenon of the absorbed liquid from the absorber. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{17~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length in the front-rear direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

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

(Three-dimensional gather)
The three-dimensional gather 60 extends along the both sides of the interior body 200 over the entire front-rear direction LD, rises from the side of the interior body 200 to the front side, contacts the wearer's legs, and prevents side leakage. is there.

  In the three-dimensional gather 60 of this embodiment, the base side portion 60B rises obliquely toward the center in the width direction, and the tip side portion 60A rises obliquely toward the outside in the width direction from the intermediate portion. The present invention is not limited, and appropriate changes such as a form of standing as a whole in the center in the width direction can be made. More specifically, the three-dimensional gather 60 according to the present embodiment folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction WD) of the three-dimensional gather 60 opposite to the front end portion is a root portion 65 fixed to the side portion on the back side of the interior body 200. The portion other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) that extends from the root portion 65. The main body portion 66 includes a root side portion 60B extending toward the center in the width direction, and a tip side portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. This form is a surface contact type three-dimensional gather 60, but a line contact type three-dimensional gather 60 that is not folded outward in the width direction can also be employed. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.

In the three-dimensional gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but is fixed so that the both ends in the front-rear direction of the main body portion 66 do not stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as shown in FIG. Particularly, when the root portion 65 is located on the back side of the interior body 200, the three-dimensional gather 60 abuts on the surface around the leg because the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion. As a result, the fit is improved.

The gathered non-woven fabric 62 is made of a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SSMMS, etc.), a melt-blown non-woven fabric with excellent uniformity and concealment, and water-repellent with silicone or the like if necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the gather elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Moreover, as shown in the drawing, a waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two. In this case, the gathered nonwoven fabric 62 is partially omitted in the portion where the waterproof film 64 is present. However, in order to make the appearance and feel of the product like a cloth, it is necessary that at least the outer surface from the base end to the tip end of the three-dimensional gather 60 is formed of the gathered nonwoven fabric 62 as shown in the figure. is there.

  Like the three-dimensional gather 60 of this embodiment, the main body portion 66 is a bent portion including a base side portion 60B extending toward the center in the width direction and a tip side portion 60A that is folded back at the tip of the base side portion 60B and extends outward in the width direction. In the form, at the lying down portion 67, the tip side portion 60A and the root side portion 60B are joined in the lying down state, and the root side portion 60B is joined to the top sheet 30 in the lying down state. At least one of a hot melt adhesive by various coating methods and a material welding method such as heat sealing or ultrasonic sealing can be used for joining the opposing surfaces in the lying portion 67. In this case, the joining of the base side part 60B and the top sheet 30 and the joining of the tip side part 60A and the base side part 60B may be performed by the same means or by different means. For example, it is one preferable embodiment that the base side portion 60B and the top sheet 30 are joined by a hot melt adhesive, and the tip side portion 60A and the base side portion 60B are joined by material welding.

The number of gather elastic members 63 provided in the free part of the three-dimensional gather 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, it will become easy to hit | skin with respect to skin in the range which has arrange | positioned the gathering elastic member 63. FIG. The gather elastic member 63 may be disposed not only at the tip side but also at the base side.

In the free portion 68 of the three-dimensional gather 60, hot melt adhesives and heat seals and ultrasonic waves by various coating methods are used to bond the inner and outer layers of the gathered nonwoven fabric 62 and to fix the gathered elastic member 63 sandwiched therebetween. At least one of fixing means by material welding such as a seal can be used. Since the flexibility is lost when the entire inner layer and outer layer of the gathered nonwoven fabric 62 are bonded together, it is preferable that portions other than the bonding portion of the gather elastic member 63 are not bonded or are bonded weakly. In the illustrated form, a hot melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 by a coating means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62, whereby the gathered elastic member 63 The gather elastic member 63 is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62 and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the outer member. Yes.

  Similarly, for the fixing of the waterproof film 64 and the gathered nonwoven fabric 62 incorporated in the three-dimensional gather 60 and the fixing of the lying portion 67, hot melt adhesives by various application methods, and material welding such as heat sealing and ultrasonic sealing are used. At least one of the means can be used.

  The dimensions of the three-dimensional gather 60 of the present embodiment can be determined as appropriate. However, in the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the main body portion 66 in the unfolded state). ) W2 is preferably 15 to 60 mm, particularly preferably 20 to 40 mm. Moreover, it is preferable that the separation distance W1 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is 60 to 190 mm, particularly 70 to 140 mm.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. If the absorbent body 56 is excellent in shape maintenance, the packaging sheet 58 can be omitted as necessary.

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

  The absorber 56 may have a rectangular shape. However, as shown in FIGS. 1 and 7 and the like, if the hourglass shape has a constricted portion 56N having a narrower width than the both front and rear sides, as shown in FIGS. The fit of the body 56 itself and the three-dimensional gather 60 around the legs is preferable.

  Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the full width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of absorbent article can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes), and particles falling under the screen by this screening When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.

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

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

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

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

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

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

(Part that does not have a liquid-impermeable sheet)
As shown in FIGS. 3 to 5, at least the intermediate portion in the width direction of the interior body 200 is a portion 203 that does not have the liquid-impermeable sheet 11 outside the absorbent element 50. That is, in this embodiment, the liquid impervious sheet 11 that prevents the seepage to the back side, which is conventionally provided in the interior body 200, is not provided in the interior body 200. In the present embodiment, the waterproof film 64 built in the three-dimensional gather 60 extends to the back side of the absorbent element 50 at both ends in the width direction of the interior body 200, so that both ends in the width direction have the liquid-impermeable sheet 11. Although it is the part which has, it can also be set as the form which does not extend to the back side of the interior body 200, even if it exists in the form which does not have the waterproof film 64 in the three-dimensional gather 60, In that case, the whole width direction of the interior body 200 is This is the portion that does not have the liquid-impermeable sheet 11 outside the absorbent element 50. Further, a waterproof film other than the waterproof film 64 of the three-dimensional gather 60 may be provided outside the absorbent element 50 at both ends in the width direction WD of the interior body 200.

(Exterior body)
The exterior bodies 12F and 12B are composed of a front exterior body 12F which is a part constituting at least a waist part of the front body F, and a rear exterior body 12B which is a part constituting at least a waist part of the rear body B, The front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side and are separated in the front-rear direction LD. This separation distance 12d can be about 150 to 250 mm, for example. Moreover, as shown in FIG.12 and FIG.13, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. Further, in this embodiment, the rear exterior body 12B has a longer longitudinal dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the intermediate region L. The side exterior body 12B has a collar cover portion C that extends from the waistline region T to the intermediate region L side. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Moreover, in the illustrated form, the lower edge of the buttock cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F, but is positioned closer to the waist opening as it goes outward in the width direction. It can also be a curve that becomes.

  As shown in FIGS. 4 and 5, the outer bodies 12 </ b> F and 12 </ b> B are composed of an outer sheet layer 12 </ b> S and an inner sheet layer 12 </ b> H that are respectively positioned outside and inside elastic members 15 to 19, which will be described later. It is joined by the joining means. The sheet material that forms the outer sheet layer 12S and the sheet material that forms the inner sheet layer 12H may be a single sheet material, or may be individual sheet materials. That is, in the former case, the inner sheet layer is formed by an inner part and an outer part of one sheet material folded at the edge of the waist opening WO (may be an edge on the crotch side) in a part or all of the exterior body. 12H and the outer sheet layer 12S are respectively formed. In the former form, there is an advantage that the number of sheet materials is small, and in the latter form, there is an advantage that misalignment is difficult when the inner sheet layer 12H and the outer sheet layer 12S are bonded together. The illustrated form corresponds to the latter, and the sheet material forming the inner sheet layer 12H extends only to the edge of the waist opening WO, but the sheet material forming the outer sheet layer 12S is the inner sheet layer 12H. The sheet material is wrapped around the waist side edge of the sheet material and folded back inside, and the folded portion 12r extends so as to cover the end of the interior body 200 on the waist side.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without any particular limitation, but is preferably a non-woven fabric. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, Nonwoven fabrics composed of mixed fibers, composite fibers or the like in which more than one species are used can be used. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² . Moreover, it is preferable that the thickness of the nonwoven fabric used for the outer side sheet layer 12S and the nonwoven fabric used for the inner side sheet layer 12H is 0.1-0.5 mm, respectively.

Moreover, it is preferable that the total fabric weight (sum of the fabric weight of the outer sheet layer 12S and the fabric weight of the inner sheet layer 12H) of the nonwoven fabric used for the exterior bodies 12F and 12B is about 20 to 60 g / m ² .

(Extensible / non-extensible area)
The exterior bodies 12F and 12B are provided with elastic members 15 to 19 between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit of the wearer to the torso, and the elastic members 15 to 19 are accompanied by expansion and contraction. Therefore, it is preferable that the expansion / contraction region A2 elastically expanding and contracting in the width direction WD is formed. In the stretchable region A2, in the natural length state, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic member to form wrinkles or wrinkles. The sheet layer 12 </ b> S and the inner sheet layer 12 </ b> H can be stretched to a predetermined stretch rate that can be fully stretched. As the elastic members 15 to 19, well-known elastic members such as a band shape, a net shape, and a film shape can be used without particular limitation, in addition to an elongated elastic member (illustrated example) such as rubber thread. As the elastic members 15 to 19, synthetic rubber or natural rubber may be used.

  For bonding the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B and fixing the elastic members 15 to 19 sandwiched therebetween, hot melt adhesives, heat seals and ultrasonic seals by various coating methods are used. It is possible to use at least one of fixing means such as material welding. Since the flexibility is lost when the entire exterior bodies 12F and 12B are firmly fixed, it is preferable that portions other than the bonded portions of the elastic members 15 to 19 are not bonded or are bonded weakly. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the sheet layers 12S and 12H, whereby the elastic members 15 to 19 are applied. The elastic members 15 to 19 are fixed to the two sheet layers 12S and 12H and the two sheet layers 12S and 12H are fixed only by the hot melt adhesive applied to the outer peripheral surface. The elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region.

The elastic members 15 to 19 in the illustrated form will be described in more detail. Between the outer sheet layer 12S and the inner sheet layer 12H in the waist part W of the exterior bodies 12F and 12B, a plurality of elastic members 15 to 19 are continuously provided in the width direction WD. The waist elastic members 17 are attached at intervals in the front-rear direction. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic members 17, you may overlap with the interior body 200 or the width direction center which overlaps with the interior body 200 You may provide each in the width direction both sides except a part. The waist elastic member 17 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. the rubber thread 0mm about ²⁾ is preferably provided about 3 to 22 present at intervals of 4 to 12 mm, which by extension ratio in the width direction WD of the waist portion W is 150% to 400%, especially at about 220 to 320 percent Preferably there is. Further, the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.

  Further, a plurality of waist lower portion elastic members 15 and 19 made of an elongated elastic member are spaced in the front-rear direction between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the exterior bodies 12F and 12B. Attached.

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

  Further, a cover elastic member 16 made of an elongated elastic member is attached between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover portion C of the rear exterior body 12B.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ^It is preferable to provide one or a plurality of thread rubbers at intervals in the front-rear direction, and the expansion ratio of the buttock cover portion C in the width direction WD is 150 to 300%, particularly 180 to 260%. Is preferred.

  In the case of providing a groin cover portion on the front exterior body 12F, a cover portion elastic member can be similarly provided.

  When the elastic members 15, 16, 19 are provided in the front-rear direction range having the absorber 56 like the waist lower part U and the buttock cover part C in the form shown in FIG. In order to prevent the shrinkage of the body 56 in the width direction WD, the intermediate in the width direction (preferably including the entire inner and outer joint portions 201 and 202) including part or all of the portion overlapping the absorber 56 and the width direction WD is not present. It is set as the expansion-contraction area | region A1, and the width direction both sides are set as the expansion-contraction area | region A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction. Of course, unlike the embodiment shown in FIG. 11, the elastic member is not cut and the non-stretchable region A1 need not be provided.

  The stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic members 15, 16, 19 are stretched in the stretchable region A2. At least both ends in the expansion / contraction direction are fixed via a hot melt adhesive, and are not fixed in the region that becomes the non-stretchable region A1, but the elastic members 15, 16, and 19 are intermediate in the width direction in the region that becomes the non-stretchable region A1. The elastic members 15, 16 and 19 are cut by pressing and heating at one location, or the entire elastic members 15, 16, and 19 are cut finely by pressing and heating, and the stretchable area A2 remains stretchable while the stretchable area A1 is stretched. Can be built by killing sex. In the former case, as shown in FIG. 4, in the non-stretchable region A1, in the state where the remaining cutting portion continuous from the elastic members 15, 16, 19 of the stretchable region A2 is contracted to the natural length alone as the unnecessary elastic member 18, In the latter case, it remains between the outer sheet layer 12S and the inner sheet layer 12H. In the latter case, although not shown in the drawing, the remaining cutting portion continuous from the elastic members 15, 16, and 19 in the expansion / contraction region A2, and the elastic member 15 in both expansion / contraction regions A2 , 16 and 19 are left between the outer sheet layer 12S and the inner sheet layer 12H in a state in which the cut pieces of the elastic member that are not continuous with the unnecessary elastic member are contracted to the natural length alone.

(Inner / outer joint)
The interior body 200 can be fixed to the exterior bodies 12F and 12B by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. Inner and outer joints 201 and 202 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire overlapping region, for example, provided in a portion excluding both ends in the width direction of the inner body 200. You can also.

(Liquid impervious sheet)
Characteristically, as shown also in FIG. 21 (b), it passes outside the outer sheet layer 12S in the exterior bodies 12F and 12B and covers the entire portion 203 of the interior body 200 that does not have the liquid-impermeable sheet 11. A liquid-impermeable sheet 11 made of a resin film is provided. In this respect, this embodiment is different from the conventional embodiment having the liquid-impermeable sheet 11 inside the exterior bodies 12F and 12B as shown in FIG. Further, the liquid-impermeable sheet 11 is a decorative print sheet provided with a decorative print 27 as shown in FIGS. 2 and 7, and in addition to this, a decorative print sheet including a decorative print sheet is provided. It is not done.

  As long as the liquid-impermeable sheet 11 covers the entire portion 203 of the interior body 200 that does not have the liquid-impermeable sheet 11, the dimensions and positions in the front-rear direction and the width direction can be appropriately determined. In general, the liquid-impermeable sheet 11 is a range in the width direction of the narrowest portion of the interior body 200 (in the case of the illustrated example, the total width 200x of the interior body 200) as shown in FIG. In the case of the exterior integrated type, as shown in FIG. 12, the narrowest portion of the exterior body 12 or the interior body 200 has a wider width (illustrated). In the form, it is preferable that the outer body 12) is provided with a narrower overall width 11x within the range in the width direction of the narrowest portion. The total width 11x of the liquid-impermeable sheet 11 is preferably 10 mm or more wider than the total width of the portion 203 of the interior body 200 that does not have the liquid-impermeable sheet 11. In particular, when the three-dimensional gather 60 has a root portion 65 fixed to the back side of the interior body 200 in order to improve leakage prevention, the root portion 65 and the liquid-impermeable sheet 11 are in the width direction. It is preferable to have an overlapping portion of 5 mm or more. Furthermore, in the form in which the three-dimensional gather 60 includes the waterproof film 64 in the root portion 65 as shown in the figure, the waterproof film of the root portion 65 and the liquid-impermeable sheet 11 have an overlapping portion of 5 mm or more in the width direction. It is preferable.

  The front-rear direction dimension 11y of the liquid-impermeable sheet 11 is the same as the front-rear direction dimension of the absorbent element 50 as shown in FIG. 8, and it is sufficient if it is provided in the same front-rear direction range as the absorbent element 50. As shown, it is also preferably provided in a longitudinal range that is longer than the absorbent element 50 and wider than the absorbent element 50. The liquid-impermeable sheet 11 can be folded inside the exterior bodies 12F and 12B through the waist opening as in the cover sheet 13 shown in FIG. 9, but as shown in FIG. 8, the exterior of the exterior bodies 12F and 12B. When provided only on the waist opening, the edge of the liquid-impermeable sheet 11 on the side of the waist opening WO is preferably spaced from the waist opening WO to the crotch side, and in particular, located from the waist part W to the crotch side. preferable.

  In particular, in the case of the exterior two-divided type as in this embodiment, the position where the front exterior body 12F and the rear exterior body 12B are separated in the front-rear direction LD corresponds to the urine supply position, and leakage prevention is particularly important. It is an area. In this embodiment, the liquid-impermeable sheet 11 is positioned outside the exterior bodies 12F and 12B. However, in such an exterior two-part structure, the front exterior body 12F and the rear exterior body 12B are in the front-rear direction LD. Since the portion 203 that does not have the liquid-impermeable sheet 11 in the inner body 200 can be covered with the liquid-impermeable sheet 11 without passing through the outer bodies 12F and 12B, the urine can be covered with the outer body 12F. , 12B penetrates into the outside and hardly leaks out. In particular, when the three-dimensional gather 60 has the root portion 65 fixed to the back side of the interior body 200, the root of the three-dimensional gather 60 is located at a position where the front exterior body 12F and the rear exterior body 12B are separated in the front-rear direction LD. The portion 65 and the liquid-impermeable sheet 11 can be directly bonded to each other, and a structure excellent in leakage prevention can be obtained. Furthermore, since the cover sheet 13 to be described later is provided over the front exterior body 12F and the rear exterior body 12B, it has a continuous appearance and feel over the front exterior body 12F and the rear exterior body 12B.

Although the raw material of the liquid-impermeable sheet 11 is not specifically limited, For example, the plastic film which consists of olefin resin etc., such as polyethylene and a polypropylene, can be illustrated. The liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture -permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used.

  The liquid-impermeable sheet 11 has a decoration pattern (including a picture and a one-point character), a function display such as usage and assistance, and a size, or a mark such as a manufacturer, a product name, and a characteristic function. A decorative print such as a display is added. When using a highly opaque resin film for the liquid-impermeable sheet 11, it is necessary to print on the outer surface. For example, when using a highly transparent resin film, the inner surface of the liquid-impermeable sheet 11 is used. A printing section can also be provided.

  The inner surface of the liquid-impermeable sheet 11 is opposed to the outer sheet layer 12S of the outer package which is the opposing surface in the case of the exterior integral type, and the front exterior body 12F and the rear exterior body 12B in the case of the exterior two-part type. The outer sheet layer 12S and the back surface of the interior body 200 are bonded via a hot melt adhesive 11H. In the main region excluding the front and rear end portions of the liquid-impermeable sheet 11, it is preferable that at least both side end portions (preferably the entire width direction) are continuously bonded in the product longitudinal direction. Further, in the form in which the three-dimensional gather 60 includes the waterproof film 64 at the root portion 65 as shown in the figure, the waterproof film 64 and the liquid in the portion where the waterproof film 64 of the root portion 65 and the liquid-impermeable sheet 11 overlap. The width of all the adhesive layers located between the impermeable sheet 11 (if there is one adhesive layer) is preferably 3 mm or more, particularly preferably 5 mm or more, and when there are a plurality of adhesive layers It is preferable that all the adhesive layers have overlapping portions, and the width of the overlapping portions of the adhesive layers is preferably 3 mm or more. The front and rear end portions of the liquid-impermeable sheet 11 are not adhered to the exterior bodies 12F and 12B, and can be adhered in the same manner as the region between them.

(Cover sheet)
The entire outer surface of the liquid-impermeable sheet 11 is covered with a cover sheet 13 made of a nonwoven fabric. Thereby, even if the liquid-impermeable sheet 11 is provided outside the exterior bodies 12F and 12B, it becomes a product outer surface such as a cloth. In addition, since the liquid impermeable sheet 11 is provided with the decorative print 27, it is not necessary to use a dedicated decorative print 27 sheet, and the decorative print 27 can be seen through the cover sheet 13. However, the decorative print 27 is close to the outer surface of the product and can be visually recognized more clearly.

  In the illustrated embodiment, the entire outer surface of the liquid-impermeable sheet 11 is covered with a single cover sheet 13, but a plurality of liquid-impermeable sheets are provided, such as providing the cover sheet 13 separately for the front body and the back body. You may comprise so that the whole 11 outer surface may be covered.

  The front-rear direction range of the cover sheet 13 is not particularly limited, and can be the same as or wider than the liquid-impermeable sheet 11. Reference numeral 13y in the figure indicates the total length of the cover sheet 13. For example, as shown in FIG. 9, at least one of the front body F and the back body B, the cover sheet 13 extends toward the waist opening WO and wraps around the edge of the waist opening WO to the inside of the exterior bodies 12F and 12B. It may be folded. Thereby, the front edge and the rear edge of the cover sheet 13 are not exposed to the product outer surface, and the appearance is improved. Moreover, it becomes difficult to generate | occur | produce the situation that the front edge and the rear edge of the cover sheet 13 are rubbed with clothes.

  In particular, as illustrated, when the cover sheet 13 extends to the end of the interior body 200 on the side of the waist opening WO, the folded portion 12r of the outer sheet layer 12S of the exterior bodies 12F and 12B is omitted. Can do. In this case, the liquid-impermeable sheet 11 may be folded inside the exterior bodies 12F and 12B in the same manner as the cover sheet 13, but the edge of the liquid-impermeable sheet 11 on the waist opening WO side is as shown in the figure. It is preferable that the waist opening WO is separated from the crotch side.

  The range in the width direction of the cover sheet 13 is not particularly limited, and considering the manufacturing method to be described later, it is preferably the same as the liquid-impermeable sheet 11 as shown in FIG. 10, but liquid-impermeable as shown in FIG. It can also be made into the range wider than the permeable sheet 11. Reference numeral 13x in the figure indicates the full width of the cover sheet 13. However, if the cover sheet 13 extends to the expansion / contraction region A2, a shrinkage wrinkle is also formed in the cover sheet 13, so that the side end portion of the cover sheet 13 is easily peeled off or the wrinkle is noticeable and looks unnatural. It becomes. On the other hand, it is preferable that the cover sheet 13 is provided within the range in the width direction of the non-stretchable region A1 because the entire cover sheet 13 has few wrinkles and is excellent in aesthetic appearance. Moreover, it is more preferable that the both side edges of the cover sheet 13 are located on the center side in the width direction than the positions of the both side edges of the absorbent element 50. That is, if the side end portion of the cover sheet 13 is located in a portion having low rigidity or is easily deformed, the cover sheet 13 may be peeled off even if it is adhered to the facing surface. Moreover, when the side edge part of the cover sheet 13 is easily rubbed against the wearer's leg, the possibility of peeling becomes higher and the step may deteriorate the touch. On the other hand, when the side end portion of the cover sheet 13 is located in a region having the absorbent element 50, that is, a region that is higher in rigidity and less susceptible to deformation than the surroundings, and the wearer's legs are not easily rubbed, When the side end portion is bonded to the opposing surface, the adhesion is difficult to peel off, the boundary is integrated seamlessly, and does not stand out. In order to obtain such a structure, the liquid-impervious sheet 11 such as the waterproof film 64 of the above-described three-dimensional gather 60 is provided on the back side of both side portions of the absorbent element 50 in the interior body 200, and the exterior body 12F, It is necessary to narrow the width of the liquid-impermeable sheet 11 provided outside the 12B. In addition, if the nonwoven fabric is not provided outside the outer sheet layer 12S in the exterior body 12F, 12B, the portion that does not overlap the absorbent element 50 is thinly stretched and contracted in the width direction outside the positions of both side edges of the absorbent element 50. And a portion overlapping with the absorbent element 50 is preferable because it is excellent in a soft hand feeling.

The fiber type of the nonwoven fabric used for the cover sheet 13 and the processing method of fiber bonding (entanglement) are not particularly limited, and the same materials as the materials of the exterior bodies 12F and 12B can be appropriately selected. It is desirable to use it. The basis weight of the cover sheet 13 is preferably about 20 to 40 g / m ^2. Furthermore, it is preferable that the thickness of the cover sheet 13 is 0.3 to 1.0 mm. When the inner sheet layer 12H and the outer sheet layer 12S are nonwoven fabrics, the thickness of the cover sheet 13 is larger than the thickness of each of the inner sheet layer 12H and the outer sheet layer 12S. Although it may be thin, it is preferably thicker than the thickness of each of the inner sheet layer 12H and the outer sheet layer 12S. On the other hand, when the inner sheet layer 12H and the outer sheet layer 12S are non-woven fabrics, if the fiber orientations of the inner sheet layer 12H, the outer sheet layer 12S, and the cover sheet 13 match in the width direction WD, the longitudinal and lateral tensile elongation (or (Aspect ratio of tensile elongation) is close, so when deformed during use, the inner sheet layer 12H, the outer sheet layer 12S and the cover sheet 13 can be deformed integrally, and the side edges of the cover sheet 13 are Since it becomes difficult to peel, it is preferable. The cover sheet 13 is preferably a single layer that overlaps the area having the liquid-impermeable sheet 11 or the decorative print 27, but can be formed in two layers in other areas, for example, as shown in FIG. As described above, the two sides of the cover sheet 13 are folded back to the center in the width direction WD or a separate non-woven fabric is applied to form a two-layer structure, and the elastic member 13G is attached between the layers along the front-rear direction LD. It is also possible to extend and contract.

The cover sheet 13 may use a non-porous nonwoven fabric that does not have holes penetrating the front and back, but in this embodiment, the cover sheet 13 is a perforated nonwoven fabric provided with a large number of holes 14 penetrating the front and back surfaces at intervals. not only improves the air permeability, the preferred order visibility of the decorative printing of a liquid impermeable sheet is improved.

  When a perforated nonwoven fabric is used for the cover sheet 13, it may have a region without the holes 14 in a part of the front and rear direction LD of the cover sheet 13. It is desirable. On the other hand, in a form having areas without holes 14 at both ends in the width direction WD of the cover sheet 13, when the holes 14 are opened by a method other than punching with a cutter, the peripheral portions 14e of the holes 14 will be described later. When the fiber is retracted outward or in the vertical direction, the peripheral portion 14e of the hole 14 warps and the thickness of the perforated region becomes thicker than that of the non-perforated region. This part is in a loosely wound state, and wrinkles and folds may be formed in the non-porous regions on both sides. Therefore, it is desirable that the hole 14 is formed over the entire width direction WD as illustrated. By forming holes in the cover sheet 13 in the manufacturing process of the diaper, materials without holes can be used, and the hole forming site can be arbitrarily controlled. As a result, the entire manufacturing becomes large, and the cost and the burden of maintenance become large, and there is a problem that it is difficult to adjust the hole shape and the softness in the high-speed line. Therefore, it is preferable to manufacture using a material in which holes are formed throughout the front-rear direction and the width direction.

  The planar shape (opening shape) of each hole 14 can be determined as appropriate. In addition to the long hole shape as shown in FIGS. 17 (a) and 17 (b), as shown in FIGS. 17 (c) and 17 (e). It can be an arbitrary shape such as a perfect circle, an ellipse as shown in FIG. 17D, a polygon such as a triangle, a rectangle or a rhombus, a star or a cloud. Although the size of each hole 14 is not particularly limited, the maximum dimension 14L in the front-rear direction LD is preferably 0.4 to 1.8 mm, particularly preferably 0.8 to 1.3 mm, and the maximum dimension 14W in the width direction WD is The thickness is preferably 0.3 to 1.5 mm, particularly preferably 0.5 to 1.0 mm. When the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangle shape, a rhombus shape, etc., the maximum dimension in the longitudinal direction is 2.5 times or less than the maximum dimension in the direction orthogonal thereto. It is preferable. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

The area and area ratio of each hole 14 may be determined as appropriate, but the area is preferably about 0.2 to ^2.5 mm ² (particularly 0.5 to 1.5 mm ² ). It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

  Although the plane arrangement of the holes 14 can be determined as appropriate, a plane arrangement that is regularly repeated is preferable, and an orthorhombic lattice shape as shown in FIG. 17A or a hexagonal lattice shape as shown in FIG. (These are also referred to as a staggered pattern), a square grid pattern as shown in FIG. 17 (c), a rectangular grid pattern as shown in FIG. 17 (d), and a parallel grid as shown in FIG. Thus, a configuration in which two groups are arranged so that a large number of parallel diagonal rows intersect each other) (including those inclined at an angle of less than 90 degrees with respect to the front-rear direction LD) In addition to what is regularly repeated, the group of holes 14 (group unit arrangement may be regular or irregular, and may be a pattern, a character, or the like) may be regularly repeated.

The front-rear direction interval 14y and the width-direction interval 14x of the holes 14 can be determined as appropriate. However, in consideration of air permeability, each of the intervals is preferably 0.5 to 8 mm, particularly 1 to 5 mm. When the width direction interval 14x is averaged, it is preferably within a range of 1 to 5 mm. In particular, as shown in FIG. 17 (d), the hole 14 is elongated in the front-rear direction LD, and the holes 14 are aligned in the front-rear direction with a front-rear distance 14y narrower than the maximum dimension 14L of the hole 14 in the front-rear direction LD. 14 rows are repeated at a predetermined interval in the width direction WD, and the width direction interval 14x is wider than the maximum dimension 14L of the hole 14 in the front-rear direction LD (more than three times the width direction dimension 14W of the hole 14). It is preferable that the air permeability is significantly improved, the softness and bulkiness are not impaired, and the tensile strength of the sheet in the front-rear direction, which is important during production, is not reduced.

  As shown in FIG. 14, the cross-sectional shape of the hole 14 is such that the thickness of the nonwoven fabric decreases as it approaches the edge of the hole 14 from the periphery of the hole 14, and the edge of the hole 14 is positioned in the middle of the thickness direction of the nonwoven fabric. As shown in FIG. 15, the peripheral portion 14e of the hole 14 is warped to the front side as shown in FIG. 15, and the peripheral portion 14e of the hole 14 is bent as shown in FIG. The third embodiment is a high third mode in which the peripheral portion 14e has a facing portion having the highest warping height 14i and a facing portion facing in a direction orthogonal to the surrounding portion 14b and having the lowest warping height 14j. Any of these may be used. From the viewpoint of air permeability, the second and third forms in which the portion having the hole 14 is thicker than the surroundings are desirable. In particular, the third form is caused by the difference between the warped heights 14i and 14j of the peripheral part 14e of the hole 14. The formed gap is preferable because it contributes to improvement in air permeability. In the second and third embodiments, the warping heights 14g, 14h, 14i (apparent height in a state where no pressure is measured using an optical microscope) is about 0.2 to 1.2 mm. In the third embodiment, the highest curvature height 14i is preferably about 1.1 to 1.4 times the lowest curvature height 14j.

  Even if the hole 14 is a punched hole 14 whose edge is formed by a cut end of the fiber, the edge of the hole 14 has almost no cut end of the fiber, and a pin is inserted between the fibers and pushed wide. The formed non-punched holes 14 (the fiber density in the peripheral portion is high) may be used. The former is suitable for the first embodiment, and the latter is suitable for the second and third embodiments. For example, when the hole 14 having a shape long in one direction is formed by inserting a pin, the fibers in the peripheral portion 14e of the hole 14 are retracted outward or in the vertical direction, and the peripheral portion 14e of the hole 14 is warped, and the longitudinal direction of the hole 14 The warping height i of the facing portion is higher than the warping height j of the facing portion in the direction orthogonal to the longitudinal direction. In the second and third embodiments, the edge of the portion where the peripheral portion 14e of the hole 14 is warped to the surface may have a fiber density lower than that of the peripheral portion, but it is the same or higher. It is preferable. Moreover, although it is desirable that the fibers in the peripheral portion 14e of the hole 14 are fused, the fibers may not be fused.

  The inner surface of the cover sheet 13 is bonded only to the liquid-impermeable sheet 11 via the hot-melt adhesive 13H when the front-rear direction range and the width-direction range of the cover sheet 13 and the liquid-impermeable sheet 11 match ( For the form in which the range in the width direction matches, see FIG. 10), as shown in FIG. 3, when the cover sheet 13 is larger than the liquid impermeable sheet 11, the portion overlapping the liquid impermeable sheet 11 is liquid impermeable. The part protruding from the liquid-permeable sheet 11 and the liquid-impermeable sheet 11 is bonded to the exterior body via the hot melt adhesive 13H.

  When the cover sheet 13 is bonded to the opposing surface at least at both side ends, preferably the entire width direction WD, in the main region excluding the front and rear ends (about 2 to 10 mm), the side ends of the cover sheet 13 Is bonded to the opposite surface, so the boundary is seamlessly integrated and is not noticeable. The front and rear end portions of the cover sheet 13 can be bonded in the same manner as the main region in addition to non-bonding to the exterior bodies 12F and 12B. In particular, when the outer sheet layer 12S is a nonwoven fabric and the positions of both side edges of the liquid-impermeable sheet 11 coincide with the positions of both side edges of the cover sheet 13, the inner surface of the cover sheet 13 has its front and rear ends. In the removed area, at least both side edges are bonded to the liquid-impermeable sheet 11 via the hot-melt adhesive 13H, and the inner surface of the liquid-impermeable sheet 11 is an area excluding the front and rear edges. When at least both end portions are bonded to the exterior bodies 12F and 12B via the hot melt adhesive 11H, both end portions of the cover sheet 13 are made of non-woven fabric via the liquid-impermeable sheet 11 made of a resin film. Since it adheres to the outer sheet layer 12S, the bonding between the both end portions of the cover sheet 13 and the outer sheet layer 12S becomes strong.

  Thus, the structure in which at least both side edges of the cover sheet 13 are bonded via the hot melt adhesive 13H can be manufactured by, for example, the manufacturing method shown in FIG. That is, this manufacturing method includes an exterior body assembly process (not shown), an elastic member cutting process 301, an interior body attachment process 302, a cover sheet bonding process 303, a waist part folding process 304, a folding process (not shown), And a side joining and disconnecting step. 20A is a flowchart of the manufacturing facility, FIG. 20B is a plan view showing a change in the assembly state, and both drawings are drawn correspondingly.

  In the exterior assembly process, one sheet material continuous in the MD direction is folded in the CD direction so as to sandwich the elastic member continuously supplied in the MD direction, or two sheet materials continuous in the MD direction Are bonded together to form an exterior belt-like body 120 in which the elastic member is interposed between the inner sheet layer and the outer sheet layer. The exterior band 120 is a portion that becomes an exterior body that is continuously repeated in the MD direction so that the width direction WD coincides with the MD direction in the production line. In the illustrated embodiment, an exterior belt-like body 120 including a portion that becomes a front-side exterior body 12F of the exterior two-divided type and an exterior belt-like body 120 including a portion that becomes the rear-side exterior body 12B are separately formed. In this case, it goes without saying that the outer strip 120 is one.

  Next, an elastic member cutting step 301 is performed on the formed exterior belt-shaped body 120 as necessary, and a predetermined interval is provided in the MD direction, and the elastic elastic member 121 located in a portion CT that overlaps the interior body 200 later is provided. It cut | disconnects with cutting devices 310, such as heat embossing, and it is set as the state which the contraction force of the elastic elastic member 121 does not act substantially in the said part CT.

  In the interior body attaching step 302, the exterior strip 120 is transferred in parallel with a spacing in the CD direction in the same arrangement as the developed state of the diaper. By sequentially joining the inner body 200 in the unfolded state manufactured simultaneously in a line by a known method, an inner assembly body in which the portions that become individual diapers are continuous in the MD direction in the unfolded state is formed. These joining and fixing can be performed by appropriate means such as a hot melt adhesive.

  In the cover sheet bonding step 303, the cover sheet 13 is bonded to the surface of the exterior belt-shaped body 120 opposite to the joint surface of the interior body 200 with a space in the MD direction. The cover sheet adhering step 303 only needs to be before the folding step, but the cover sheet 13 extends from the front body F to the back body B. The position after the position where the positional relationship between the exterior belt-like body 120 including the portion that becomes the body 12F and the exterior belt-like body 120 including the portion that becomes the rear exterior body 12B is determined, that is, after the interior body attachment step 302 is preferable.

  In the waist portion folding step 304, the end 122 on the CD direction outer side of the outer band 120 is folded back toward the center in the CD direction, and the elastic member 123 is continuously sandwiched in the MD direction under the folded portion. Thereby, attachment of the waist part elastic member 17 and formation of the folding | returning part 12r can be performed.

  Thereafter, although not shown, a pants-type disposable diaper can be manufactured by a known method. That is, in the folding step, the interior body 200 is attached to the exterior belt-shaped body 120, and the interior assembly body after the cover sheet 13 is attached is folded in the CD direction to form a double-fold belt-shaped body, and the side joining In the separation step, the outer body of the front body and the outer body of the back body are joined at the side portions of each diaper in the folded band-shaped body, and the front body and the back body of the front body are joined at the boundary of each diaper. Individual diapers are obtained by cutting the outer package.

  Characteristically, in the cover sheet bonding step 303, the belt-like body 130 of the cover sheet that is continuous in a belt shape is conveyed along the continuous direction, and is applied to the adhesive surface with respect to the exterior belt-like body 120 by the coating device 312 in the MD direction. After continuously applying the hot melt adhesive, the slip cutter 311 is cut into individual cover sheets 13 at intervals in the MD direction, and the cut cover sheets 13 are joined to the inner body 200 in the outer band 120. Adhere to the surface opposite to the surface with a gap in the MD direction. As a result, the hot melt adhesive can be continuously applied in the width direction WD to the side edge of the cover sheet 13 except for the front and rear end portions of the cover sheet 13, and the cover sheet 13 does not protrude from the hot melt adhesive. Can be firmly bonded to the opposite surface.

  In particular, as shown in the figure, a strip of a liquid-impermeable sheet made of a resin film having a decorative print on the adhesive surface of the strip 130 of the cover sheet to the exterior strip 120 before the cover sheet bonding step 303. It is one preferable mode to add a resin film bonding step 305 for continuously bonding 111 in the MD direction. Reference numeral 313 denotes a coating apparatus that applies a hot melt adhesive to the adhesive surface of the cover sheet strip 130 with the liquid impermeable sheet strip 111. Thus, in the cover sheet bonding step 303, the coating device 312 continuously applies hot water in the MD direction to the adhesive surface of the cover sheet band 130 to which the liquid impermeable sheet band 111 is bonded to the exterior band 120. After applying the melt adhesive, the slip cutter 311 is cut into individual cover sheets 13 and liquid-impermeable sheets 11 at intervals in the MD direction, and the cut cover sheet 13 and liquid-impermeable sheet 11 are cut. The exterior belt-like body 120 is bonded to the surface opposite to the joint surface of the interior body 200 with an interval in the MD direction. In this case, both side edges of the cover sheet 13 in the product and both side edges of the liquid-impermeable sheet 11 coincide with each other. In this embodiment, after the strip 111 of the liquid-impermeable sheet made of a resin film is attached to the strip of the cover sheet 13, it is cut into individual cover sheets 13 and attached to the exterior strip 120. The rigidity of the individual cover sheets 13 is increased by the amount of the resin film, and the air permeability is remarkably lowered. Therefore, the cover sheet 13 is sucked and held by the slip cutter 311 as indicated by the arrow in the figure, and is opposed to the exterior band 120. When intermittently pasting, the shape and suction retention are stable, and stable pasting is possible.

  Although not shown, the liquid-impermeable sheet 11 is bonded to the exterior band-shaped body 120 before the cover sheet 13 is bonded, instead of the liquid-impermeable sheet band 111 attached to the cover-sheet band 130, Further, the cover sheet 13 may be adhered from above.

  When the cover sheet 13 is a perforated nonwoven fabric, a perforated nonwoven fabric that has been processed in advance can be used as the cover sheet 13, but in-line processing is preferable in order to reduce material costs. However, when perforating the nonwoven fabric, it is difficult to stably perform high-precision processing as the processing line speed increases. In contrast, in the cover sheet bonding step 303 in the manufacturing method of the illustrated embodiment, the supply speed of the cover sheet strip 130 to the cover sheet bonding step 303 is slow due to cutting and intermittent pasting. As shown in the figure, when a punching device 314 is added to the supply line of the band of the cover sheet 13 to the cover sheet bonding step 303 and the punching step 306 is performed on the cover sheet 13, stable punching can be performed. preferable.

  On the other hand, in the case of the cover sheet 13 having the holes 14, as shown in FIG. 18, one preferable bonding structure is a peripheral portion of a region overlapping with the holes 14 in at least one bonding region of the inner surface and the outer surface of the cover sheet 13. There is no hot melt adhesive 13H on the center side from 14i, and the hot melt adhesive 13H is present in a continuous surface except for the peripheral edge portion 14i in the region overlapping the hole 14. Since there is no hot melt adhesive 13H on the center side of the peripheral edge portion 14i in the region overlapping with the hole 14, the air permeability is excellent. Further, only the surface opposite to the surface that touches the skin, the portion having such an adhesive structure is less likely to become sticky to the hot melt adhesive 13H, and the peripheral portion 14e of the hole 14 is securely fixed to the facing surface. Is done.

  As a typical adhesion state, as shown in FIGS. 18A and 18B, there is no hot melt adhesive 13H in the region overlapping the hole 14, and the hot melt adhesive 13H is continuous in the region other than the region overlapping the hole 14. As shown in FIGS. 18 (c) and 18 (d), the hot melt adhesive 13 </ b> H protrudes from the peripheral edge portion 14 i of the region overlapping the hole 14, but the peripheral edge of the region overlapping the hole 14. The hot melt adhesive 13H does not exist in the center side from the part 14i, and the hot melt adhesive 13H exists in a continuous surface shape except for the peripheral part 14i in the region overlapping the hole 14. The former state is a particularly desirable state, but the peripheral edge portion 14i of the region overlapping with the hole 14 is a portion close to the peripheral portion 14e of the hole 14, and the cover sheet 13 has a certain thickness. Even if the hot melt adhesive 13H protrudes from this portion, only the surface opposite to the surface touching the skin adheres to the surface opposite to the adhesive surface of the cover sheet 13 by hand. There is almost no direct contact with the agent 13H. The protruding width of the hot melt adhesive 13H at the peripheral edge 14i in the region overlapping with the hole 14 is preferably not more than half the thickness of the cover sheet 13 and not more than about 0.5 mm. Further, it is desirable that the hot melt adhesive 13H does not exist in a portion of 80% or more of the area of the region overlapping with the hole 14.

  The cross-sectional shape of the hole 14 in the cover sheet 13 is not limited. However, when the peripheral portion 14e of the hole 14 is a warped portion that is warped toward the liquid-impermeable sheet 11 as described above, the liquid-impervious portion. The hole diameter viewed from the liquid-impermeable sheet 11 side is smaller than the hole diameter viewed from the surface on the side opposite to the conductive sheet 11 side. Therefore, in the portion where only the surface opposite to the surface touching the skin is bonded, it becomes difficult to touch the hot melt adhesive 13H when the surface opposite to the bonding surface is touched by hand. Further, since the warped portion supports the cover sheet 13 with respect to the facing surface like a support column, the warped portion becomes bulky and excellent in air permeability as compared with a non-porous nonwoven fabric having the same basis weight. Furthermore, in the region other than the peripheral portion 14e of the hole 14, the adhesion between the cover sheet 13 and the liquid-impermeable sheet 11 is likely to float (in FIG. 18, the hot melt adhesive 13H seems to fill the space between the sheets without any gaps). Although the actual coating amount is small and a gap is easily formed), the peripheral portion 14e of the hole 14 is securely bonded, and incomplete bonding is performed in other regions (substantially small bonding area is small). This makes it possible to obtain excellent softness and softness.

  Such an adhesive structure can be produced by applying a hot melt adhesive to the adhesive surface of the perforated nonwoven fabric in the form of a continuous surface without using air, and adhering to the opposing surface. In this method, when the hot melt adhesive is applied to the adhesive surface in the porous nonwoven fabric in a continuous surface shape without using air, the surface tension of the hot melt adhesive is applied before bonding to the opposing surface. This is based on a novel finding that a mouth (hole) is opened at the center of the portion of the hot melt adhesive that overlaps the hole of the perforated nonwoven fabric, and the opening extends to the periphery of the hole of the perforated nonwoven fabric. That is, when such an adhesion method is employed, as indicated by an arrow in FIG. 19, the hot melt adhesive 13H is applied to the perforated nonwoven fabric in a continuous surface and before being bonded to the target member, Due to the surface tension of the adhesive 13H, a mouth (hole) h is opened at the center of the portion of the hot melt adhesive 13H that overlaps the hole 14 of the porous nonwoven fabric, and the opening h expands to the peripheral portion 14e of the hole 14 of the porous nonwoven fabric. To do. Therefore, after bonding the perforated nonwoven fabric to the target member, as shown in the example shown in FIG. 18, there is no hot melt adhesive 13H in most of the holes 14, and the hot melt adhesive 13H from the holes 14 by air is removed. Since there is no omission or exudation, it becomes difficult to feel sticky when touching the surface opposite to the adhesive surface with a hand.

  As a hot melt applicator for applying a hot melt adhesive in a continuous surface form without using air, a coating head (die) is brought into contact with the adhesive surface of a perforated nonwoven fabric, and a CD provided at the tip of the coating head. The coating head (die) was lifted from the slot coat where the hot melt adhesive was applied through the slit along the direction (direction perpendicular to the MD direction (the flow direction of the production line)) or the adhesive surface of the perforated nonwoven fabric. In this state, the hot melt adhesive is extruded from the slit along the CD direction provided at the tip of the coating head, and the hot melt adhesive is stretched according to the difference in the transfer speed of the perforated nonwoven fabric and applied in the form of an extremely thin film. A non-contact type slot coat can be preferably used.

The bonding conditions can be determined as appropriate. In order to quickly move the hot melt adhesive 13H overlapping the hole 14 to the peripheral part 14e of the hole 14 and firmly bond the peripheral part 14e of the hole 14, the following conditions are satisfied. It is desirable to satisfy at least one of the following.
Melt viscosity of hot melt adhesive (temperature 140 ° C.): 3,000 to 2,600 mPa · s
Melt viscosity of hot melt adhesive (temperature 160 ° C.): 1,150 to 1,550 mPa · s
Temperature at the time of application of the hot melt adhesive to the porous nonwoven fabric: 110 to 150 ° C
Application amount of hot melt adhesive to porous nonwoven fabric: 1.0 to 8.0 g / m ²
Open time after application of hot melt adhesive: 0.1 to 1.0 seconds

<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.

  “MD direction” means the flow direction of the production line and is an abbreviation of machine direction, and “CD direction” means a lateral direction orthogonal to the MD direction and is an abbreviation of cross direction. One is the longitudinal direction of the product, and the other is the width direction of the product. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric.

  -"Fiber orientation" is the direction along which the fibers of the nonwoven fabric are aligned. For example, the measurement method according to the fiber orientation test method based on the zero distance tensile strength of TAPPI standard method T481, the tensile strength in the front-rear direction and the width direction It can be discriminated by a simple measurement method for determining the fiber orientation direction from the ratio.

  ・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

  ・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It means the far side.

・ "Area ratio" means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, cover sheet) by the area of the target region. It is. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the pores can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation and measuring conditions 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

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

  -"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% 1.0 g of a superabsorbent polymer is added to 49.0 g of the mixture) and stirred 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 automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  -The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

  ・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  -"Developed state" means a state where the plate is flattened without contraction or slack.

  -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  The present invention can be used for a pants-type disposable diaper.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 13 ... Cover sheet, 14 ... Hole, 17 ... Waist portion elastic member, 18 ... unnecessary elastic member, 200 ... interior body, 201, 202 ... inner / outer joint, 27 ... decorative printing, 30 ... top sheet, 301 ... elastic member cutting step, 302 ... interior body attaching step, 303 ... Cover sheet bonding step, 304 ... Waist folding step, 305 ... Resin film bonding step, 306 ... Punching step, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 60A ... tip side part, 60B ... root side part, 62 ... gathered nonwoven fabric, 67 ... lying down part, A1 ... non-stretchable region, A2 ... stretchable region, B ... back body, C ... 臀Cover, F ... front body, L ... intermediate region, LD ... front-rear direction, T ... waist region, U ... waist lower part, W ... waist, WD ... width direction, WO ... waist opening.

Claims (8)

An exterior body that constitutes at least the waist area of the front body and at least the waist area of the back body, and an interior body that incorporates an absorption element attached to the exterior body so as to extend from the front body to the back body,
The exterior body includes an elastic member, an inner sheet layer adjacent to the inner side of the elastic member, and an outer sheet layer adjacent to the outer side of the elastic member,
Both side portions of the outer body of the front body and both side portions of the rear outer body of the rear body are joined, and a waist opening and a pair of left and right leg openings are formed,
In pants-type disposable diapers,
At least the widthwise intermediate portion of the interior body is a portion that does not have a liquid-impermeable sheet outside the absorbent element,
It has a liquid-impermeable sheet made of a resin film that passes outside the outer sheet layer in the exterior body and covers the entire portion of the interior body that does not have the liquid-impermeable sheet,
The liquid-impermeable sheet is decorated with a decorative print,
The entire outer surface of the liquid-impermeable sheet is covered with a cover sheet made of a nonwoven fabric.
A pants-type disposable diaper characterized by that. Both side edges of the cover sheet are positioned closer to the center in the width direction than the positions of both side edges of the absorbent element, and the inner surface of the cover sheet is opposed to at least both side edges in the region excluding the front and rear ends. Bonded to the surface via hot melt adhesive,
The pants-type disposable diaper according to claim 1. The inner sheet layer and the outer sheet layer are nonwoven fabrics,
The fiber orientation of the inner sheet layer, outer sheet layer and cover sheet is in the width direction,
The pants-type disposable diaper according to claim 2. The cover sheet extends toward the waist opening at least one of the front body and the back body, and is folded back to the inner side of the inner sheet layer at the waist opening.
The underpants type disposable diaper of any one of Claims 1-3. The exterior body has a non-stretchable region provided in a width direction intermediate portion of a region overlapping with the absorbent element, and a stretchable region provided on both sides in the width direction of the non-stretchable region,
The cover sheet is provided within a range in the width direction of the non-stretchable region,
The underpants type disposable diaper of any one of Claims 1-4. The outer sheet layer is a nonwoven fabric,
The positions of both side edges of the liquid-impermeable sheet coincide with the positions of both side edges of the cover sheet;
The inner surface of the cover sheet is bonded to the liquid-impermeable sheet through a hot-melt adhesive in the region excluding the front and rear ends thereof, and at least both side ends.
The inner surface of the liquid-impermeable sheet is bonded to the exterior body through a hot-melt adhesive in the region excluding the front and rear ends,
The underpants type disposable diaper of any one of Claims 1-5. As the exterior body, a front exterior body constituting at least a waist part of the front body and a rear exterior body constituting at least a waist part of the back body are separately provided, and the front exterior body and the rear exterior body are front and rear. Separated in the front-rear direction in the middle of the direction,
The underpants type disposable diaper of any one of Claims 1-6. The cover sheet is a perforated nonwoven fabric provided with a large number of holes penetrating the front and back at intervals,
The underpants type disposable diaper of any one of Claims 1-7.

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