JP2018051042A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of an appearance due to formation of a cutting trace of an elastic member on a display sheet.SOLUTION: A stretchable area A2 of an exterior body 12 has: plural slender elastic members 15-19 arranged at an interval in a cross direction LD along a width direction WD; an inside sheet layer 12H adjacent to inside of the elastic members 15-19; an intermediate sheet layer 12C adjacent to outside of the elastic members; and an outside sheet layer 12S adjacent to outside of the intermediate sheet layer 12C. A non-stretchable area A1 of the exterior body 12 has: an inside sheet layer 12H, an intermediate sheet layer 12C and an outside sheet layer 12S continuous from the stretchable area A2. A display sheet 25 which can be visually recognized from an outer surface is provided between the intermediate sheet layer 12C and the outside sheet layer 12S in the non-stretchable area A1. In the non-stretchable area A1, there are cutting traces 22 of the elastic members 15, 16, 19 on the inside sheet layer 12H and the intermediate sheet layer 12C, and there is no cutting trace of the elastic member on the display sheet 25 and the outside sheet layer 12S.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a pants-type disposable diaper including a display sheet on which a design or the like is printed, and a method for manufacturing the same.

  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 the state extended in the width direction at intervals is relatively high in fit to the body (for example, see Patent Documents 1 to 4).

  The waistline region and the intermediate region overlap the front-rear direction range having the absorber, and there are inner and outer fixing portions for fixing the interior body to the exterior body in the range. Therefore, even if an elastic member is provided so as to cross the range in the front-rear direction having the absorber, its expansion / contraction function is limited by the rigidity of the absorber. In addition, the absorbent body may contract in the width direction, thereby deteriorating the wearing feeling and appearance, and the absorbent body may be twisted or cracked, resulting in a decrease in absorption performance.

  For this reason, conventionally, the elastic member is attached continuously along the width direction, and almost the entire portion overlapping the absorber is finely cut or the elastic member is not fixed to the exterior body at the portion overlapping the absorber. In addition, it is generally employed to form a non-stretchable region in which the contraction force in the width direction does not act on the absorber by cutting at one place in the middle in the width direction. As this cutting method, as one of the methods in which a hole is not opened in the inner sheet layer and the outer sheet layer covering the inside and outside of the elastic member, with the elastic member sandwiched between the inner sheet layer and the outer sheet layer, the inside and outside A method for cutting an elastic member by pressurizing and heating a cutting site is known.

  On the other hand, in the exterior body in the non-stretchable region, the contraction force of the elastic member hardly acts and the shrinkage wrinkles are hardly formed, and therefore, the exterior body is excellent in light transmittance as compared with the portion where the shrinkage wrinkles are formed. Therefore, the display sheet which attached the pattern etc. was interposed between the exterior body and interior body in this part (refer patent document 1) and the sheet | seat layer (refer patent document 2) of an exterior body.

  Since the display sheet is visually recognized through the constituent material of the exterior body, the display sheet is provided with the elastic member of the exterior body and the outer side thereof as in the case of Patent Document 2 in that the display can be visually recognized more clearly. It is desirable to interpose between the sheet layer. In this case, since the display sheet and the elastic member are adjacent to each other, in order to completely eliminate the influence of the contraction force of the elastic member, the elastic member is provided with respect to the display sheet and the inner sheet layer. It is desirable to have a non-fixed structure, that is, a display sheet back non-fixed structure.

  However, when manufacturing, when the elastic member and the display sheet are arranged between the outer sheet layer and the inner sheet layer and the elastic member is cut by pressurization and heating in the region having the display sheet, the elastic sheet and the display sheet are formed at the cut portion of the elastic member. Traces of unevenness may remain, or holes may be opened due to tearing or melting, and these cut traces may deteriorate the appearance of the display sheet. In particular, if the display sheet is a thermoplastic sheet such as a general nonwoven fabric or a resin film, it goes without saying that the display sheet may be partially cut or perforated due to melting of the display sheet. .

JP 2012-1000069 A Japanese Patent Laid-Open No. 2004-254861 JP 2011-254996 A JP 2007-014802 A

  Then, the main subject of this invention is preventing the deterioration of the appearance by the cutting trace of an elastic member being formed in a display sheet.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
An exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body provided on the exterior body so as to extend from the front body to the back body,
The both sides of the exterior body of the front body and the both sides of the back exterior body of the back body are joined, respectively, and have a waist opening and a pair of left and right leg openings,
The outer body of at least one of the front body and the back body has a non-stretchable region provided in the middle in the width direction in the front-rear direction range having the absorber, and a stretchable region provided on both sides in the width direction of the non-stretchable region. And
The stretchable region is adjacent to the outer side of the elastic member, a plurality of elongated elastic members along the width direction arranged at intervals in the front-rear direction, an inner sheet layer adjacent to the inner side of the elastic member, and An area having an intermediate sheet layer and an outer sheet layer adjacent to the outer side of the intermediate sheet layer;
The non-stretchable region has an inner sheet layer, an intermediate sheet layer, and an outer sheet layer continuous from the stretchable region,
Between the intermediate sheet layer and the outer sheet layer in the non-stretchable region, a display sheet visible from the outer surface is provided,
In the non-stretchable region, the inner sheet layer and the intermediate sheet layer have a trace of cutting the elastic member, and the display sheet and the outer sheet layer have no trace of cutting the elastic member,
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, in the stretchable region and the non-stretchable region of the exterior body, the elastic member is sandwiched between the inner sheet layer and the intermediate sheet layer, the display sheet is disposed on the outer side, and the outer layer is covered with the outer sheet layer. ing. In the non-stretchable region, the inner sheet layer and the intermediate sheet layer have traces of cutting of the elastic member, and the display sheet and the outer sheet layer have no trace of cutting of the elastic member. Such a structure can be manufactured by a manufacturing method to be described later, and can surely prevent deterioration in appearance due to formation of cut marks of the elastic member on the display sheet.

<Second aspect>
The pants-type disposable diaper according to the second aspect, wherein at least in the stretchable region, the intermediate sheet layer and the outer sheet layer are joined by a joint provided at an interval in the width direction.

(Function and effect)
In the stretchable region, the inner sheet layer and the intermediate sheet layer are stretched together with the elastic member. Here, when the intermediate sheet layer and the outer sheet layer are bonded to each other at a bonding portion provided at an interval in the width direction, the inner sheet layer and the intermediate sheet layer together with the elastic member in a natural length or in a state of being contracted to some extent. The outer sheet layer also contracts along with the contraction, and the portion located between the joints in the outer sheet layer bulges outward to form a ridge that extends in a direction perpendicular to the expansion and contraction direction. In other words, the stretch region has no wrinkles in a state where the outer sheet layer is fully extended, but the wrinkles rise between the joints in the outer sheet layer as it contracts, and the height of the wrinkles is the highest in the natural length. When such a crease is formed, not only the touch becomes soft, but also the air permeability in the direction along the crease improves between the outer sheet layer and the intermediate sheet layer. In the present invention, since the number of layers of the outer package is larger than that of the conventional one, such improvement in air permeability is important.

<Third Aspect>
The pants-type disposable diaper according to the first or second aspect, wherein at least in the stretchable region, the inner sheet layer and the intermediate sheet layer are joined at a joint provided at intervals in the width direction.

(Function and effect)
In the stretchable region, the inner sheet layer and the intermediate sheet layer are stretched together with the elastic member. Here, when the inner sheet layer and the intermediate sheet layer are joined at a joint provided at intervals in the width direction, the inner sheet layer and When the intermediate sheet layer contracts, the portions of the inner sheet layer and the intermediate sheet layer located between the joints swell in opposite directions to form a ridge that extends in a direction perpendicular to the expansion and contraction direction. Therefore, not only is the touch soft, but also the air permeability in the direction along the ridge is improved between the inner sheet layer and the intermediate sheet layer. In the present invention, since the number of layers of the outer package is larger than that of the conventional one, such improvement in air permeability is important.

<Fourth aspect>
The inner sheet layer and the outer sheet layer are non-woven fabric layers containing a softening agent, and the intermediate sheet layer is a non-woven fabric layer containing no softening agent,
The elastic member is bonded to the intermediate sheet layer via a hot melt adhesive,
The underpants type disposable diaper of any one aspect of 1st-3rd.

(Function and effect)
Since the inner sheet layer is covered with the inner sheet layer and the outer cover is covered with the outer sheet layer, if the inner sheet layer and the outer sheet layer are softened nonwoven fabrics containing a softener, the softener is added to the intermediate sheet layer. Even if a non-woven fabric containing no is used, there is little influence on the touch, and conversely, the intermediate sheet layer does not contain a softening agent, so that the adhesiveness of the hot melt adhesive is excellent. Therefore, it becomes excellent in adhesiveness when the elastic member is bonded to the intermediate sheet layer via the hot melt adhesive.

<Fifth aspect>
The inner sheet layer and the outer sheet layer are nonwoven layers that do not have coloring and printing with a dye,
The pants type disposable diaper according to any one of the first to fourth aspects, wherein the intermediate sheet layer is a nonwoven fabric layer having coloring or printing with a dye.

(Function and effect)
Since the inner sheet layer is covered with the inner sheet layer and the outer sheet layer is covered with the outer sheet layer, the inner sheet layer and the outer sheet layer are made of non-woven fabric layers that do not have coloring and printing with a dye. By using a non-woven fabric layer having coloring and printing with a dye, the appearance can be improved while avoiding color transfer to the skin and clothing.

<Sixth aspect>
It is a manufacturing method of the underpants type disposable diaper of the 1st mode,
When forming the outer package, the inner sheet layer and the intermediate sheet layer are bonded together, and the elastic member is attached between them, and an outer package intermediate body having a portion that becomes the stretchable region and a portion that becomes the non-stretchable region. Forming,
In the portion that becomes the non-stretchable region in the exterior intermediate body, the elastic member is cut,
Thereafter, the display sheet is affixed to the outside of the exterior intermediate body, and the outer sheet layer is affixed to the outside thereof, or the outer sheet layer is affixed to the inner surface of the exterior intermediate body. Paste on the outside,
A method for producing a pants-type disposable diaper characterized by the above.

(Function and effect)
Thus, an exterior intermediate body in which an elastic member is attached between the inner sheet layer and the intermediate sheet layer is formed, the elastic member is cut in the exterior intermediate body before the display sheet is attached, By pasting the display sheet and the outer sheet layer, it is not necessary to cut the display sheet. Therefore, although the cutting trace remains in the inner sheet layer and the intermediate sheet layer, there is no possibility that the cutting trace remains in the display sheet. Therefore, it is possible to reliably prevent the appearance from being deteriorated due to the cut trace of the elastic member being formed on the display sheet. In addition, unnecessary elastic members due to the cutting of the elastic members, and cut traces of the inner sheet layer and the intermediate sheet layer are hidden behind the display sheet, so that this point is also excellent in appearance.

  As described above, according to the present invention, advantages such as prevention of deterioration of appearance due to formation of cut traces of the elastic member on the display sheet are brought about.

It is an expanded state top view which shows the inner surface of a pants type disposable diaper. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. (A) 5-5 sectional drawing of FIG. 1, (b) 6-6 sectional drawing of FIG. It is a perspective view of a pants type disposable diaper. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. (A) 5-5 sectional drawing of FIG. 7, (b) 6-6 sectional drawing of FIG. (A) 5-5 sectional drawing of FIG. 1, (b) 6-6 sectional drawing of FIG. It is a disassembled assembly drawing of an exterior body. It is sectional drawing of an exterior body. It is a disassembled assembly drawing of an exterior body. It is a disassembled assembly drawing of an exterior body. It is sectional drawing of an exterior body. It is a perspective view which shows the assembly process of an exterior body roughly. It is an enlarged plan view of a display sheet portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 show an example 100 of a pants-type disposable diaper. The dotted pattern in the figure indicates 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.

  The pants-type disposable diaper 100 of the present embodiment extends from the front exterior body 12F constituting the front body F and the rear exterior body 12B constituting the rear body B and from the front exterior body 12F to the rear exterior body 12B through the crotch part. The exterior body 12F and 12B are provided inside the exterior body 12F, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portion 12A. By being formed, the opening formed by the front and rear end portions of the exterior bodies 12F and 12B becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the exterior bodies 12F and 12B and the interior are formed on both sides in the width direction of the interior body 200. The portions surrounded by the side edges of the body 200 are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the deployed state. The full width of is shown.

  Moreover, the pants-type disposable diaper 100 of this embodiment forms a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. And an intermediate region L defined as a front-rear direction range (between the front-rear region having the side seal portion 12A of the front body F and the front-rear region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where 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 a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes a 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. Reference numeral 60 denotes an interior body. In order to prevent excrement from leaking on both sides of 200, a three-dimensional gather 60 that is provided on both sides of the interior body 200 and stands on the body side is shown.

  The interior body 200 can be fixed to the exterior bodies 12F and 12B by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the inner surface of the exterior body 12F, 12B is fixed by the hot melt adhesive applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 and the mounting portion 65 of the three-dimensional gather 60 in this case. Has been. The inner and outer fixing portions 201 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, and are usually provided in a portion excluding both ends in the width direction WD of the inner body 200. It is preferable to provide it.

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

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

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

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

(Second seat)
In order to make the liquid which permeate | transmitted the top sheet 30 transfer to an absorber rapidly, the 2nd sheet | seat 40 whose permeation | transmission speed | rate of a liquid is faster than the top sheet 30 can be provided. This second sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversal” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of The second sheet 40 can be omitted.

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

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

  For the purpose of preventing displacement of the second sheet 40 with respect to the back side member, it is desirable that the second sheet 40 be 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 embodiment, the second sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 by a hot melt adhesive applied to the back surface thereof.

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

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

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

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends along the both sides of the interior body 200 in the front-rear direction LD, blocks excrement that travels in the lateral direction along the top sheet 30, and prevents lateral leakage. It is provided to do. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side part of the interior body 200, the base side part stands up obliquely toward the center side in the width direction WD, and the part on the tip side from the intermediate part Stands up diagonally toward the outside of the width direction WD.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD and folds it into two. In the meantime, a plurality of elongated gather elastic members 63 are fixed in the width direction WD at intervals in the stretched state along the longitudinal direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction WD) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portions other than the attachment portion 65 are projecting portions 66 (parts on the folded portion side) that protrude from the attachment portion 65. Further, the projecting portion 66 includes a root side portion toward the center side in the width direction WD and a tip side portion folded back from the tip of the root side portion to the outside in the width direction WD. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction WD can also be employed. And while the both ends of the front-back direction LD among the protrusion parts 66 are made into the front-back fixing | fixed part 67 fixed with respect to the side part surface of the top sheet 30 in the lying state, on the front-back direction LD located between these The intermediate portion is a non-fixed free portion 68, and a gather elastic member 63 along the front-rear direction LD is fixed to the free portion 68 in an extended state.

  In the free part 68 of the three-dimensional gather 60, a hot melt adhesive, heat seal and ultrasonic waves by various coating methods are used to bond the inner layer and the outer layer of the gather sheet 62 and to fix the gather elastic 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 gather sheet 62 are bonded together, it is preferable that the portions other than the bonding portion of the gather elastic member 63 are not bonded or bonded weakly. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic member 63 by an application means such as a comb gun or a sure wrap nozzle, and sandwiched between the inner layer and the outer layer of the gather sheet 62, thereby collecting the gather elastic member 63. The gather elastic member 63 is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gather sheet 62. Yes.

  Also, hot melt adhesives and heat seals by various application methods are used for fixing the waterproof film 64 and the gather sheet 62 incorporated in the three-dimensional gather 60 and fixing the front and rear fixing portion 67 to the side surface of the interior body 200. Or at least one of means by material welding such as ultrasonic sealing can be used. In the illustrated embodiment, slot application of hot melt adhesive is used for fixing the waterproof film 64. Further, in the illustrated embodiment, the front and rear fixing portion 67 is fixed by combining hot melt adhesive and material welding means, but these can be fixed only by any one of the means.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the 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%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  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.

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

  In the three-dimensional gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring both end portions in the front-rear direction LD closer to each other, but the both end portions in the front-rear direction LD among the protruding portions 66 do not stand up. Since they are fixed, they are non-fixed free parts, so that only the free parts stand up against the body as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open to the outside in the width direction WD at the crotch portion and in the vicinity thereof. Will come into contact with each other, improving the fit.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate, but in the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 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 preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

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

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

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

  The absorber 56 may have a rectangular shape, but as shown in FIGS. 1 and 2, the front end portion, the rear end portion, and a constricted portion having a narrower width than the front end portion and the rear end portion are located between them. It is preferable to form an hourglass shape having the shape because the fit of the absorbent body 56 and the three-dimensional gather 60 around the legs is improved.

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

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

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

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

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

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

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

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

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

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD. This separation distance 12d can be about 150 to 250 mm. A part of the exposed portion of the back surface of the interior body 200 in the separated portion (for example, the entire portion in the front-rear direction of the portion exposed between the front exterior body 12F and the rear exterior body 12B, but does not extend to the front and rear ends of the interior body 200. In addition, it is desirable to attach the crotch portion cover sheet 12M made of nonwoven fabric or the like so as to cover the entire side of the interior body 200 so that both side edges in the width direction WD do not reach the both side edges of the interior body 200, but may be omitted. . Moreover, as shown in FIG.7 and FIG.8, the exterior body 12 can also be made into the integrated body which continues between crotches from the front body F to the back body B. That is, the exterior bodies 12F and 12B that individually configure the front body F and the back body B correspond to the former form, and the exterior body 12 that integrally configures the front body F and the back body B corresponds to the latter form. .

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion 14 that extends from the waist region T to the intermediate region L side. doing. 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. In the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that comes to be located at.

  As shown in FIGS. 3 to 5, the exterior bodies 12 </ b> F and 12 </ b> B include a plurality of elongated elastic members 15 to 19 along the width direction WD arranged at intervals in the front-rear direction LD, and the elastic members 15. ˜19, an inner sheet layer 12H adjacent to the inside of the elastic members 15-19, an intermediate sheet layer 12C adjacent to the outer side of the elastic members 15-19, and an outer sheet layer 12S adjacent to the outer side of the intermediate sheet layer 12C. The inner sheet layer 12H and the intermediate sheet layer 12C, and the intermediate sheet layer 12C and the outer sheet layer 12S are bonded together by a joining means such as a hot melt adhesive or welding.

  The sheet material for forming the inner sheet layer 12H, the intermediate sheet layer 12C, and the outer sheet layer 12S is formed by individual sheet materials as shown in FIGS. 8 and 9, and as shown in FIG. A common sheet material is folded on the waist side or the crotch side to form any two layers, or although not shown, one sheet material is folded on the waist side and the crotch side to form all the sheet layers You can also do it. In the form shown in FIG. 5, the outer sheet layer 12S is formed by an outer portion extending from the waist-side end portion of the first sheet material S1 to the crotch side end portion, and is folded inward at the crotch side end portion of the outer portion. The inner sheet layer 12H is formed by the inner part extending to the end part on the waist side, and is sandwiched between the outer part and the inner part in the first sheet material S1, and extends from the end part on the waist side of the exterior body 12 to the crotch The intermediate sheet layer 12C is formed by the second sheet material S2 extending to the end on the side. Further, this structure has an advantage that the second sheet material S2 constituting the intermediate sheet layer 12C is completely wrapped by the first sheet material S1 constituting the inner sheet layer 12H and the outer sheet layer 12S.

  Further, the sheet material (first sheet material S1 in the form shown in FIG. 5) that forms any of the inner sheet layer 12H, the intermediate sheet layer 12C, and the outer sheet layer 12S is disposed at the innermost side of the exterior body at the edge of the waist opening. When the end portion on the waist side of the interior body 200 is covered with the folded portion 12r, the edge on the waist side of the intermediate sheet layer 12C and the cutting edge of the sheet positioned at the front and rear edges of the interior body 200 come into contact with the skin. Can prevent the touch from getting worse.

  In any case, since the inner sheet layer 12C is covered with the inner sheet layer 12H and the outer cover is covered with the outer sheet layer 12S, the inner sheet layer 12H and the outer sheet layer 12S are softened nonwoven fabrics containing a softening agent. If present, even if a non-woven fabric that does not contain a softening agent is used for the intermediate sheet layer 12C, there is little effect on the touch, and conversely, the intermediate sheet layer 12C does not contain a softening agent, so that the adhesiveness of the hot melt adhesive is excellent. It will be a thing. Therefore, it becomes excellent in adhesiveness when the elastic members 15 to 19 are bonded to the intermediate sheet layer 12C via the hot melt adhesive. For the same reason, by using a nonwoven fabric layer that does not have coloring and printing with a dye for the inner sheet layer 12H and the outer sheet layer 12S, and a nonwoven fabric layer that has coloring and printing with a dye for the intermediate sheet layer 12C, It is also possible to improve the appearance while avoiding color transfer to the skin and clothing.

The sheet material used for the inner sheet layer 12H, the intermediate sheet layer 12C and the outer sheet layer 12S 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. Moreover, the nonwoven fabric which consists of a mixed fiber, a composite fiber, etc. in which 2 or more types was used from these 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 . The total weight of the exterior bodies 12F and 12B is preferably about 30 to 90 g / m ² .

(Extensible / non-extensible area)
The exterior bodies 12F and 12B are provided with elongated elastic members 15 to 19 such as rubber thread between the inner sheet layer 12H and the intermediate sheet layer 12C in order to improve the fit of the wearer to the torso, and the elastic members An expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD with 15-19 expansion / contraction. In the stretchable region A2, in the natural length state, the inner sheet layer 12H, the intermediate sheet layer 12C, and the outer sheet layer 12S contract with the contraction of the elastic member, forming wrinkles or wrinkles, and extending in the longitudinal direction of the elastic member. Then, the inner sheet layer 12H, the intermediate sheet layer 12C, and the outer sheet layer 12S can be stretched to a predetermined stretch rate that can be fully stretched. As the elastic members 15 to 19, synthetic rubber or natural rubber may be used.

  The joining of the inner sheet layer 12H, the intermediate sheet layer 12C, and the outer sheet layer 12S in the exterior bodies 12F and 12B and the fixing of the elastic members 15 to 19 sandwiched therebetween are not particularly limited, and may be performed by various application methods. It can be appropriately performed using a hot melt adhesive and fixing means by material welding such as heat sealing and ultrasonic sealing. The illustrated form is joined and fixed by a hot melt adhesive indicated by a dot pattern.

  For example, as shown in FIGS. 10 and 14, the hot-melt adhesive H1 is applied only to the outer peripheral surface of the elastic member 19 by an application means such as a comb gun or a sure wrap nozzle, and the inner sheet layer 12H and the intermediate sheet layer 12C. By sandwiching between them, only the hot melt adhesive H1 applied to the outer peripheral surface of the elastic member 19 is used to fix the elastic member 19 to the sheet layers 12H and 12C and to fix the sheet layers 12H and 12C. It is one preferred form to do. FIG. 11 schematically shows a cross-section of (a) a natural length state and (b) an extended state in this case.

  As shown in FIG. 12, the inner sheet layer 12H and the intermediate sheet layer 12C are joined by a hot melt adhesive H1 continuous in the front-rear direction LD provided at an interval in the width direction WD to form a joined portion. It is also a preferred form. FIG. 13 schematically shows a cross-section of (a) a natural length state and (b) an extended state to some extent in this case. When the inner sheet layer 12H and the intermediate sheet layer 12C are joined at the joint portion 13 provided at an interval in the width direction WD, the inner sheet is contracted in accordance with the contraction of the elastic member 19 in a natural length or in a state of being contracted to some extent. When the layer 12H and the intermediate sheet layer 12C contract, the portions located between the joint portions 13 in the inner sheet layer 12H and the intermediate sheet layer 12C swell in opposite directions, and the ridges P are straight in the direction perpendicular to the expansion and contraction direction. It is formed. Therefore, not only the touch becomes flexible, but also the air permeability in the direction along the ridge P improves between the inner sheet layer 12H and the intermediate sheet layer 12C. In this embodiment, since the number of layers of the outer package 12 is larger than that in the conventional case, such improvement in air permeability is important. In the joint portion 13, the inner sheet layer 12 </ b> H and the intermediate sheet layer 12 </ b> C are preferably joined via the hot melt adhesive H <b> 1, but may be performed by welding. Although the width of the joint part 13 and the width direction interval between the joint parts 13 adjacent to the width direction WD can be determined as appropriate, the width of the joint part 13 is about 0.5 to 4 mm, and the distance is about 4 to 8 mm. As a result, the formed ridges P extend straight and have both sufficient height and resistance to falling down.

  The attachment of the outer sheet layer 12S to the intermediate sheet layer 12C can be appropriately determined. However, as shown in FIGS. 11 and 13, the intermediate sheet layer 12C and the outer sheet layer 12S are spaced apart in the width direction WD. It is one preferable form that the bonding portion 14 is formed by bonding via a hot melt adhesive H2 continuous in the front-rear direction LD provided. When the intermediate sheet layer 12C and the outer sheet layer 12S are bonded at the bonding portion 14 provided at an interval in the width direction WD, the inner sheet layer 12H and the elastic member 19 are combined with the elastic member 19 in a natural length or a state of being contracted to some extent. The intermediate sheet layer 12C contracts, and the outer sheet layer 12S contracts along with the contraction, and a portion located between the joint portions 14 in the outer sheet layer 12S bulges outward and extends straight in a direction perpendicular to the expansion and contraction direction. P is formed. That is, the stretchable region A2 has no wrinkles P when the outer sheet layer 12S is fully extended, but the wrinkles P rise between the joints 14 in the outer sheet layer 12S as it shrinks, and the height of the wrinkles P is a natural length. The highest. When such a ridge P is formed, not only the touch becomes soft, but also the air permeability in the direction along the ridge P improves between the outer sheet layer 12S and the intermediate sheet layer 12C. In this embodiment, since the number of layers of the outer package 12 is larger than that in the conventional case, such improvement in air permeability is important. In the joining part 14, it is preferable that the inner sheet layer 12H and the outer sheet layer 12S are joined via the hot melt adhesive H2, but it can also be performed by welding. The width of the joint portion 14 and the width direction interval between the joint portions 14 adjacent to the width direction WD can be determined as appropriate, but the width of the joint portion 14 is about 0.5 to 4 mm, and the interval is about 4 to 8 mm. As a result, the formed ridges P extend straight and have both sufficient height and resistance to falling down. Is preferable.

  As shown in FIG. 14, the intermediate sheet layer 12 </ b> C and the outer sheet layer 12 </ b> S are joined by the hot melt adhesive H <b> 2 provided at intervals in the width direction WD and the front-rear direction LD to form a joint portion. It is also a preferred form that is formed. In this case, although it will be excellent in flexibility, the shape of the ridge becomes easy to wave. Although not shown, the inner sheet layer 12H and the intermediate sheet layer 12C can be joined in the same pattern.

  The elastic members 15 to 19 need only be fixed to the inner sheet layer 12H and the intermediate sheet layer 12C at least at both ends in the expansion / contraction direction in the expansion / contraction region A2. Therefore, for example, apart from the joining of the inner sheet layer 12H and the intermediate sheet layer 12C, only both ends of the elastic member can be fixed to the inner sheet layer 12H and the intermediate sheet layer 12C via the hot melt adhesive. As will be described later, the unnecessary elastic member 18 remains in the non-stretchable region A1 by cutting the elastic member. The unnecessary elastic member 18 is preferably not fixed to at least the intermediate sheet layer 12C, particularly to the inner sheet layer 12H and the intermediate sheet layer 12C, but may be strongly or weakly fixed.

Here, the various elastic members 15 to 19 included in the illustrated exterior body will be described in more detail. Between the inner sheet layer 12H and the intermediate sheet layer 12C in the waist part W of the exterior bodies 12F and 12B, a plurality of waist part elastic members 17 are attached at intervals in the vertical direction so as to be continuous over the entire width direction WD. It has been. Moreover, about the 1 or several arrange | positioned in 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 WD which overlaps with the interior body 200 May be provided on both sides in the width direction except for the central portion. 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 elastic member 17 in all of the front-rear direction LD, or have the same elongation rate. The sheath elongation rate may be different.

  Further, a plurality of elongated waist lower part elastic members 15 and 19 are attached between the inner sheet layer 12H and the intermediate sheet layer 12C in the waist lower part U of the exterior bodies 12F and 12B with a space in the vertical direction. ing.

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 plurality of elongated cover portion elastic members 16 are attached between the inner sheet layer 12H and the intermediate sheet layer 12C in the collar cover portion 14 of the rear exterior body 12B with an interval in the vertical direction.

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 that about 2 to 10 thread rubbers are provided at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation ratio of the cover portion 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 absorbent body 56 like the waist lower part U and the buttock cover part 14 in the illustrated form, the width direction of the absorbent body 56 is partly or entirely. In order to prevent the shrinkage of the WD, the intermediate in the width direction (preferably including the entire inner and outer fixing portion 201) including a part or all of the portion overlapping the absorbent body 56 and the width direction WD is defined as the non-stretchable region A1. Both sides in the width direction are taken as the stretchable region A2. Although it is preferable that the waist part W is made into the expansion-contraction area | region A2 over the whole width direction, you may provide a non-expansion-contraction area | region in the width direction middle similarly to the waist lower part U.

(Display sheet)
In the non-stretchable region A1 in at least one of the front exterior body 12F and the rear exterior body 12B, a display sheet 25 having a display 27 such as a character is interposed so as to be adjacent to the inside of the outer sheet layer 12S. The display on the display sheet 25 can be seen through the outer sheet layer 12S.

  The display sheet 25 can be bonded to at least one of the inner surface of the outer sheet layer 12S and the outer surface of the intermediate sheet layer 12C by a hot melt adhesive H3. In particular, although it is the non-stretchable region A1, fine shrinkage wrinkles or irregularities may be formed on the inner sheet layer 12H due to the influence of the unnecessary elastic member 18 remaining between the inner sheet layer 12H and the intermediate sheet layer 12C. In order to reduce the influence on the display sheet 25, it is preferable that the display sheet 25 is not joined to the intermediate sheet layer 12 </ b> C at least in a portion overlapping the unnecessary elastic member 18.

  The bonding pattern of the display sheet 25 is not particularly limited, and is similar to the bonding pattern of the outer sheet layer 12S and the intermediate sheet layer 12C as shown in FIG. 10, and as shown in FIG. In order to improve the adhesion between the sheet 25 and the outer sheet layer 12S so that the display 27 can be easily seen, it is possible to join the sheet 25 in a denser pattern. In particular, when the display sheet 25 is bonded only to the outer sheet layer 12S, if the bonding pattern of the display sheet 25 to the outer sheet layer 12S and the bonding pattern of the outer sheet layer 12S to the inner sheet layer 12H are the same, the outer sheet layer After the hot melt adhesive is applied to the inner surface of 12S in the same pattern and the display sheet 25 is attached to the non-stretchable region A1, the display sheet 25 is applied without applying the hot melt adhesive to the inner surface of the display sheet 25. It can be bonded to the intermediate sheet layer 12C via a hot melt adhesive remaining in the other portions, and is preferable because the manufacturing becomes easy.

The base material of the display sheet 25 is not particularly limited as long as it is suitable for printing. For example, paper such as crepe paper, or a resin film can be used. When a highly opaque base material such as crepe paper is used, it is necessary to provide a printing portion on the outer surface of the display sheet 25. For example, a film having a light transmittance (described later) of 90% or more is used. When a highly transparent substrate is used, a printing part can be provided on the inner surface of the display sheet 25. When crepe paper is used, the thickness is preferably 100 to 150 μm, and the density is preferably 100 to 200 kg / m ³ . A crepe paper having such a thickness and density can be produced by setting the crepe rate to around 10% with a basis weight of 10 g / m ² or more. The density can be calculated from the basis weight and thickness. Further, the crepe rate is a value calculated by ((Yankee dryer peripheral speed) − (Take-up reel peripheral speed)) / (Yankee dryer peripheral speed) × 100 (%).

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

  Characteristically, in the non-stretchable region A1, the inner sheet layer 12H and the intermediate sheet layer 12C have a cut trace 22 of the elastic member 19, and the display sheet 25 and the outer sheet layer 12S have a cut trace 22 of the elastic member 19. Absent. Such a structure can be manufactured by a manufacturing method to be described later, and can surely prevent deterioration in appearance due to the cut traces 22 of the elastic member 19 being formed on the display sheet 25.

  In particular, it is preferable that all of the cutting traces 22 are covered with the display sheet 25. Although the dimension of the display sheet 25 may be determined as appropriate, it is preferable that the display sheet 25 has a dimension that can cover all of the cutting traces 22. In a normal case, the display sheet 25 is preferably provided in a region overlapping with the interior body 200 so as to be equal to or smaller than the width of the interior body 200.

(Formation of exterior body)
FIG. 15 shows an exterior body assembly process in manufacturing a pants-type disposable diaper. That is, when forming the exterior bodies 12F and 12B, the inner sheet layer 12H and the intermediate sheet layer 12C are bonded together, and the elastic members 15, 16, and 19 are attached therebetween to form the stretchable area A2 and the non-stretchable area. The exterior intermediate body which has the part used as A1 was formed, the elastic member 15, 16, 19 was cut | disconnected in the part used as the non-expandable area | region A1 in this exterior intermediate body, and the display sheet 25 was then affixed on the inner surface The outer sheet layer 12S is attached to the outside of the exterior intermediate body. Although not shown, after the elastic members 15, 16, and 19 are cut, the display sheet 25 may be attached to the outside of the exterior intermediate body, and the outer sheet layer 12S may be attached to the outside thereof.

  The cutting pattern of the elastic members 15, 16, 19 can be determined as appropriate. The form shown in FIG. 15 shows a case where the elastic members 15, 16, and 19 are cut at one place in the middle in the width direction. In this assembling process, a pressurizing part 71 having a cutting projection 72 at one place in the circumferential direction is provided on the outer peripheral surface, and the cutting projection 72 is disposed opposite to the seal roll 70 heated to a desired temperature. The cutting target with the elastic members 15 to 17 and 19 attached between the inner sheet layer 12H and the intermediate sheet layer 12C is sandwiched by the smooth anvil roll 80 and cut so that the inner sheet layer 12H is on the seal roll side. The elastic members 15, 16, and 19 are cut by pressurizing and heating only the portions sandwiched between the convex portion 72 and the outer peripheral surface of the anvil roll 80. In the product subjected to such processing, as shown in FIGS. 16 (a) and 16 (b), between the inner sheet layer 12H and the intermediate sheet layer 12C, it continues from the elastic members 15, 16, 19 in the stretchable region A2. Only the remaining cutting portion remains as the unnecessary elastic member 18, and the stretchability can be killed in the non-stretchable region A1 while leaving the stretchable region A2. The pattern of the pressurizing part of the seal roll can be changed to a pattern in which a large number of cutting projections are arranged at intervals. In this case, as shown in FIG. 16 (c), between the inner sheet layer 12H and the intermediate sheet layer 12C, the remaining cutting portion continuous from the elastic members 15, 16, and 19 in the stretchable area A2, and both the stretchable areas A2 The cut piece of the elastic member which is not continuous with the elastic members 15, 16, 19 remains as the unnecessary elastic member 18.

  However, in this embodiment, since it is not necessary to cut the display sheet 25, the cutting trace 22 remains on the inner sheet layer 12H and the intermediate sheet layer 12C, but there is no possibility that the cutting trace 22 remains on the display sheet 25. Therefore, it is possible to reliably prevent the appearance from being deteriorated due to the cut traces 22 of the elastic members 15, 16, 19 being formed on the display sheet 25. In addition, the unnecessary elastic member 18 by cutting the elastic members 15, 16 and 19 and the cut traces 22 of the inner sheet layer 12 </ b> H and the intermediate sheet layer 12 </ b> C are hidden behind the display sheet 25. Become.

  Although the cutting region of the elastic members 15, 16, and 19 can be determined as appropriate, it is preferable that the elastic member 15, 16, and 19 be provided in a region that overlaps with the interior body 200 within the width of the interior body 200.

  The heating temperature for cutting the elastic members 15, 16, and 19 (the temperature of the cutting projections) may be determined as long as the elastic members 15, 16, and 19 can be reliably cut, but the production line is fast. In order to reliably cut the elastic members 15, 16, and 19 and prevent the cut portions of the elastic members 15, 16, and 19 from adhering to the surrounding members, the temperature is lower than the melting point of the elastic members 15, 16, and 19. However, it is preferable that the temperature is sufficiently high. When cutting the elastic members 15, 16, and 19 at such a high temperature, if the melting points of the inner sheet layer 12H and the intermediate sheet layer 12C are lower than the cutting temperature, at least one of the inner sheet layer 12H and the intermediate sheet layer 12C is elastic. Although cutting traces (melting traces and holes) remain at the cutting sites of the members 15, 16, and 19, in this embodiment, the display sheet 25 can be covered with no cutting traces, so that the appearance of the display sheet 25 is not affected. . Generally, the melting point of the nonwoven fabric used for the inner sheet layer 12H and the outer sheet layer 12S is about 160 to 175 ° C, the melting point of the elastic members 15, 16, and 19 is about 200 to 230 ° C, and the heating temperature is 180 to It can be 200 degreeC.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

  The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

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

  -"Gel strength" is measured as follows. 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 used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

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

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

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

  The present invention can be used for pants-type disposable diapers such as the above examples.

  A1 ... Non-stretchable region, A2 ... Stretchable region, L ... Intermediate region, LO ... Leg opening, T ... Trunk circumference region, U ... Waist lower part, W ... Waist part, WO ... Waist opening, LD ... Front-back direction, WD ... width direction, 11 ... liquid impermeable sheet, 12 ... exterior body, 12A ... side seal part, 12F ... front side exterior body, 12B ... rear side exterior body, 12H ... inner sheet layer, 12C ... intermediate sheet layer, 12S ... Outer sheet layer, 12r ... folded portion, 14 ... buttocks cover portion, 18 ... unnecessary elastic member, 22 ... cutting trace, 25 ... display sheet, 27 ... display, 30 ... top sheet, 40 ... second sheet, 50 ... absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 200 ... Interior body, 201 ... Inside / outside fixing part.

Claims (6)

An exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body provided on the exterior body so as to extend from the front body to the back body,
The both sides of the exterior body of the front body and the both sides of the back exterior body of the back body are joined, respectively, and have a waist opening and a pair of left and right leg openings,
The outer body of at least one of the front body and the back body has a non-stretchable region provided in the middle in the width direction in the front-rear direction range having the absorber, and a stretchable region provided on both sides in the width direction of the non-stretchable region. And
The stretchable region is adjacent to the outer side of the elastic member, a plurality of elongated elastic members along the width direction arranged at intervals in the front-rear direction, an inner sheet layer adjacent to the inner side of the elastic member, and An area having an intermediate sheet layer and an outer sheet layer adjacent to the outer side of the intermediate sheet layer;
The non-stretchable region has an inner sheet layer, an intermediate sheet layer, and an outer sheet layer continuous from the stretchable region,
Between the intermediate sheet layer and the outer sheet layer in the non-stretchable region, a display sheet visible from the outer surface is provided,
In the non-stretchable region, the inner sheet layer and the intermediate sheet layer have a trace of cutting the elastic member, and the display sheet and the outer sheet layer have no trace of cutting the elastic member,
A pants-type disposable diaper characterized by that.   The pants-type disposable diaper according to claim 2, wherein at least in the stretchable region, the intermediate sheet layer and the outer sheet layer are joined by a joint provided at an interval in the width direction.   The pants-type disposable diaper according to claim 1 or 2, wherein at least in the stretchable region, the inner sheet layer and the intermediate sheet layer are joined by a joint provided at an interval in the width direction. The inner sheet layer and the outer sheet layer are non-woven fabric layers containing a softening agent, and the intermediate sheet layer is a non-woven fabric layer containing no softening agent,
The elastic member is bonded to the intermediate sheet layer via a hot melt adhesive,
The underpants type disposable diaper of any one of Claims 1-3. The inner sheet layer and the outer sheet layer are nonwoven layers that do not have coloring and printing with a dye,
The pants-type disposable diaper according to any one of claims 1 to 4, wherein the intermediate sheet layer is a nonwoven fabric layer having coloring or printing with a dye. It is a manufacturing method of the underpants type disposable diaper of Claim 1,
When forming the outer package, the inner sheet layer and the intermediate sheet layer are bonded together, and the elastic member is attached between them, and an outer package intermediate body having a portion that becomes the stretchable region and a portion that becomes the non-stretchable region. Forming,
In the portion that becomes the non-stretchable region in the exterior intermediate body, the elastic member is cut,
Thereafter, the display sheet is affixed to the outside of the exterior intermediate body, and the outer sheet layer is affixed to the outside thereof, or the outer sheet layer is affixed to the inner surface of the exterior intermediate body. Paste on the outside,
A method for producing a pants-type disposable diaper characterized by the above.

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