JP6396148B2 - Pants-type disposable diaper manufacturing method and pants-type disposable diapers - Google Patents

Description

  The present invention relates to a pants-type disposable diaper having a compact product form and a method for manufacturing the same.

  As one form of the pants-type disposable diaper, the outer body formed by joining the both sides of the front outer body and the both sides of the rear outer body into a cylindrical shape, and the center in the width direction of the inner surface of the front outer body There is an interior body that absorbs excrement provided to the center in the width direction of the inner surface of the side exterior body, and the front exterior body and the rear exterior body are separated from each other without being continuous on the crotch side. (See, for example, Patent Document 1). Such an exterior two-part type has the advantage that it is not necessary to punch out a leg opening for passing a leg, or even if it is punched out, a small area is required. That is, since the separation piece (hereinafter also referred to as trim) is disposed of, the waste of the material (hereinafter also referred to as trim loss) can be suppressed.

As a manufacturing method of such a pants type disposable diaper of the exterior two split type,
The front exterior belt-like body that repeats and continues in the MD direction so that the width direction and the MD direction of the portion that becomes the front exterior body, and the width direction and the MD direction match the portion that becomes the rear exterior body. Forming an exterior exterior belt-like body that repeats continuously in the MD direction,
While transporting the front exterior strip and the rear exterior strip in the same arrangement as in the diaper unfolded state so that the width direction of the diaper is the MD direction, each of the front exterior strip and the rear exterior strip By sequentially joining the separately produced interior body in a deployed state to the front exterior body and the rear exterior body, an interior assembly in which the portions that become diapers are continuous in the MD direction in the deployed state is formed. , Interior body mounting process,
A folding step of folding the interior assembly in half in the CD direction to form a folded band-like body;
The outer body of the front body and the outer body of the back body are joined at both side portions of each diaper, and the front body and the back body of the front body are cut at the boundary of each diaper so that each diaper is cut. Obtaining a side joining and disconnecting step;
Is generally included (see Patent Document 2).

  However, in this manufacturing method, when attaching to the front exterior strip and the rear exterior strip in the interior attachment step, and when folding the interior assembly in the CD direction in the folding step, it is necessary to align each. There was a problem.

Special table 2007-511326 gazette Japanese Patent Laying-Open No. 2005-279077 JP 2009-273653 A JP2013-208325A JP-A-2005-329106

  Therefore, the main problem of the present invention is to simplify the alignment of the interior body with respect to the front exterior strip and the rear exterior strip, and the alignment when the front exterior strip and the rear exterior strip are overlapped, etc. It is in.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Provided on the inside of the front exterior body and the rear exterior body so as to extend from the front exterior body to the rear exterior body through the crotch part from the front exterior body and the rear exterior body that constitutes the front body And the inner body containing the excrement absorber, and the side seal portion is formed by joining the both sides of the front exterior body and the both sides of the rear exterior body, thereby opening the waist. And in the manufacturing method of the pants type disposable diaper in which the leg opening is formed,
The front exterior belt-like body that repeats continuously in the MD direction so that the width direction and the MD direction of the portion that becomes the front exterior body and the portion that becomes the rear exterior body match the width direction and the MD direction. Forming an exterior exterior belt-like body that is continuously repeated in the MD direction,
After producing the interior body, the interior body assembly step of assembling the folded interior body by folding in the front-rear direction so that the surfaces overlap each other in a single state,
The folded inner body is transported at an interval with the width direction thereof being the MD direction, and is sandwiched between the front exterior belt-like body and the rear exterior belt-like body from both front and rear sides thereof, and the folded interior body and the front exterior belt-like body An interior body attaching step for joining the body and the rear exterior belt-like body;
The front outer strip and the rear outer strip are joined at both side portions of each diaper, and the front outer strip and the rear outer strip are cut at the boundary of each diaper. Obtaining a side joining and disconnecting step;
Including
In the inner body assembly process, the front and rear of the opposing surface of the folded inner body in the direction, the elastic definitive with no portion of the absorbent body at the end of the west side, and the front outer body and rear outer body stretching The part that will overlap with the part where the member is not provided is releasably joined to form a temporary fixing part,
A method for producing a pants-type disposable diaper, characterized in that

(Function and effect)
According to this manufacturing method, the underpants type disposable diaper of the invention concerning Claim 1 can be manufactured. Further, by folding the interior body in advance in the interior body assembly process, the folding process that has been conventionally performed after joining the interior body to the exterior belt-like body can be omitted.

  In addition, by forming such a temporary fixing portion, the folded shape of the interior body is more reliably secured when the folded interior body is joined to the front exterior belt body and the rear exterior belt body in the interior body attaching step. It is preferable because it is maintained. Moreover, the underpants type disposable diaper manufactured has the advantage of the invention described in claim 4 described later.

<Invention of Claim 2>
Provided on the inside of the front exterior body and the rear exterior body so as to extend from the front exterior body to the rear exterior body through the crotch part from the front exterior body and the rear exterior body that constitutes the front body And the inner body containing the excrement absorber, and the side seal portion is formed by joining the both sides of the front exterior body and the both sides of the rear exterior body, thereby opening the waist. And in the manufacturing method of the pants type disposable diaper in which the leg opening is formed,
The front exterior belt-like body that repeats continuously in the MD direction so that the width direction and the MD direction of the portion that becomes the front exterior body and the portion that becomes the rear exterior body match the width direction and the MD direction. Forming an exterior exterior belt-like body that is continuously repeated in the MD direction,
After producing the interior body, the interior body assembly step of assembling the folded interior body by folding in the front-rear direction so that the surfaces overlap each other in a single state,
The folded inner body is transported at an interval with the width direction thereof being the MD direction, and is sandwiched between the front exterior belt-like body and the rear exterior belt-like body from both front and rear sides thereof, and the folded interior body and the front exterior belt-like body An interior body attaching step for joining the body and the rear exterior belt-like body;
The front outer strip and the rear outer strip are joined at both side portions of each diaper, and the front outer strip and the rear outer strip are cut at the boundary of each diaper. Obtaining a side joining and disconnecting step;
Including
In the interior body assembling step, the interior body is folded into a W shape so that a middle part in the front-rear direction of the interior body forms a folded portion that is folded between the front and rear sides, and the folding Bonding at least a part of the opposing surfaces of the parts in a peelable manner,
A method for producing a pants-type disposable diaper characterized by the above.

(Function and effect)
According to this manufacturing method, the manufactured pants-type disposable diaper has the advantages of the invention described in claim 3 described later.

<Invention of Claim 3>
The waist opening and the leg opening are formed by joining the both sides of the front body and the both sides of the back body to form the side seal part,
A first region defined as a front-rear direction range having a side seal portion, and a second region defined as a front-rear direction range of a portion forming a leg opening,
At least the front-rear direction intermediate part of the second region is folded between the front and rear side parts to form a folded part,
At least a part of the facing surface of the folded portion is joined in a peelable manner,
At least a part of the inner surface on the front body side and the inner surface on the rear body side facing each other has a temporary fixing portion that is releasably bonded.
A pants-type disposable diaper characterized by that.

(Function and effect)
A user of a pants-type disposable diaper may carry a replacement diaper when going out. When carrying such a replacement diaper, leave it in the packaging bag of the product and carry it alone in a portable bag, or carry it in a bag or bag with other items. To be done.
However, conventional pants-type disposable diapers are not particularly folded in the product state, and the waist opening and leg opening can be freely opened and closed. There was a risk of becoming.
On the other hand, when the temporary fixing portion is provided as described in this section, the waist opening and the leg opening are difficult to open, and the facing surface of the interior body is also difficult to open, so that it is difficult for other articles or the like to enter inside.

<Invention of Claim 4>
An interior body that individually or integrally configures the front body and the back body, and an interior of the excrement absorber provided inside the exterior body so as to extend from the front body to the back body through the crotch. A waist opening and a leg opening are formed by joining the both sides of the outer body of the front body and the both sides of the outer body of the rear body to form a side seal part,
In the part having the end on the waist side of the interior body, a temporary fixing portion is provided in which at least a part of the inner surface on the front body side and the inner surface on the rear body side facing each other are detachably joined,
The portion where the temporary fixing portion is provided is a portion where the interior body does not have an absorber and a portion where the elastic body is not provided on the exterior body.
A pants-type disposable diaper characterized by that.

(Function and effect)
It is preferable that a temporary fixing portion is provided at such a site because peeling marks of the temporary fixing portion are hard to hit the skin during use.

<Invention of Claim 5>
A first region defined as a front-rear direction range having a side seal portion, and a second region defined as a front-rear direction range of a portion forming a leg opening,
The pants-type disposable diaper according to claim 4, wherein at least a middle part in the front-rear direction of the second region is folded between the front and rear side parts to form a folded part.

(Function and effect)
Conventional pants-type disposable diapers are not particularly folded in the product state, but are flat but flexible, large in area, and have a shape that sticks the part that forms the leg circumference, so it is a bag for carrying around Some bags and bags were difficult to accommodate and difficult to carry. In this case, the user may fold it into an arbitrary shape. However, it is difficult to store the bag or bag in the bag or bag because of its shape recovery by simply folding it, and the bag or bag is restored to its original shape. There was also a fear.
On the other hand, by forming the folded portion by folding the second region, which is the crotch side portion, as described in this section, the vertical length of the product is shortened, and the shape becomes close to a rectangle. Although the thickness is partially increased, the stiffness is increased correspondingly, and the second region is folded inward, so that the maintainability of the folded shape is also high. Therefore, it is excellent in portability. At the time of use, it can be set as a use form by taking out a folding part outside.
However, when such a folded portion is formed, the waist opening and the leg opening are likely to be opened due to the increase in the inner thickness and the spring action of the folded portion. Therefore, in such a form, when the temporary fixing portion is provided as in the present invention, the waist opening and the leg opening are difficult to open, and the facing surface of the interior body is also difficult to open, so it is difficult for other articles or the like to enter inside. Therefore, it is preferable.

<Invention of Claim 6>
The pants-type disposable diaper according to claim 5, wherein at least a part of the opposing surface of the folded portion is detachably joined.

(Function and effect)
Thus, if the opposing surface of a folding part is joined so that peeling is possible, the maintainability of a folding shape will become high. At the time of use, it can be set as a use form by peeling the joint and taking out the folded portion to the outside.

<Invention of Claim 7>
The pants-type disposable diaper according to claim 5 or 6, wherein a folded edge of a facing surface of the folded portion is located in the second region.

(Function and effect)
If comprised in this way, since a folding depth is shallow, manufacture becomes easy. In particular, continuous production as in the production method described later is also facilitated.

<Invention of Claim 8>
The pants-type disposable diaper according to claim 5 or 6, wherein a folded edge of a facing surface of the folded portion is located in the first region.

(Function and effect)
In the first region, the front body and the back body are joined together by the side seal portion to form an annular shape. Therefore, when the folded portion is folded up to this region, the folding shape is more maintainable.

  As described above, according to the present invention, it is a pants-type disposable diaper that prevents entry of other articles or the like inside, and a method for manufacturing the same.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a front view of a pants type disposable diaper. It is a rear view of a pants type disposable diaper. It is a left view of a pants type disposable diaper. It is a side view of an interior body part. It is a top view which shows a manufacture flow. It is the schematic which shows an interior body folding process. It is the schematic which shows an interior body folding process. It is the schematic which shows an interior body manufacturing process. It is the schematic which shows an interior body folding process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<Pants-type disposable diapers>
1 to 11 show an example 100 of a pants-type disposable diaper. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members, and is a fixed portion of the elastic elastic member by applying solid, bead, curtain, summit or spiral such as hot melt adhesive. Instead of or together with this, it is formed by coating on the outer peripheral surface of an elastic stretchable member such as a comb gun or a sheathing coating. As the joining means for joining the constituent members, welding means such as heat sealing and ultrasonic sealing can be used.

  The pants-type disposable diaper 100 according to the present embodiment includes outer bodies 12F and 12B that constitute the front body F and the rear body B, and outer bodies 12F and 12B that extend from the front body F to the back body B through the crotch. The inner body 200 is provided on the inner side, and both side portions of the outer body 12F of the front body F and both sides of the outer body 12B of the rear body B are joined to form a side seal portion 12A. is there. Symbol Y indicates the total length of the diaper in the unfolded state (vertical length 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 symbol X indicates the total width of the diaper in the unfolded state. Is shown.

  The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. In this embodiment, the upper openings of the exterior bodies 12F and 12B serve as waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200, respectively. The enclosed part is a leg opening LO through which the leg passes.

  Moreover, the pants-type disposable diaper 100 of this embodiment forms a first region defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and the leg opening LO. It has a second region L that is defined by the longitudinal range of the part (between the longitudinal region having the side seal portion 12A of the front body F and the longitudinal region having the side seal portion 12A of the rear body B). The first region T can be divided into a “waist edge” W that conceptually forms an edge of the waist opening, and a “waist lower part” U that is a lower part than this. Normally, when the first region T has a boundary in which the width direction expansion / contraction stress changes (for example, the thickness or elongation rate of the elastic expansion / contraction member changes), the waist opening WO side is closer to the waist edge than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist edge W with respect to the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge 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 second region L are bundled along the circumference of the wearer's leg, and this is a part 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 surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

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

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

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

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of being. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

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

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

  The liquid-impermeable sheet 11 has a width that fits 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 and faces the side surface 30 of the absorbent element 50. It can also extend to both sides of the. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

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

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And the fixing means by material welding, such as a hot-melt adhesive (alternatively or in combination with this, a heat seal or an ultrasonic seal) is applied to the side surface of the topsheet 30 with both ends in the front-rear direction of the protruding portion 66 lying down. The front-rear direction fixing portion 67 is fixed to the front-rear direction intermediate portion, and the front-rear direction intermediate portion located between them is the non-fixed free portion 68. The free portion 68 is elongated along the front-rear direction. The elastic member 63 is fixed in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric excellent in uniformity and concealment, and water-repellent with silicone as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

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

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

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) 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 fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm . Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

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

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article 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 ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 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.

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

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

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

(Crotch cover sheet)
On the back surface of the liquid-impermeable sheet in the interior body 200, a part of the exposed portion of the interior body 200 (for example, the entire front-rear direction of the portion exposed between the ventral-side exterior body 12F and the back-side exterior body 12B, The crotch portion cover sheet 12M may be attached so as not to extend to the front and rear ends of the interior body 200 and to cover the entire width direction side edges so as not to reach both side edges of the interior body 200). As the crotch portion cover sheet 12M, the same material as that used for exterior bodies 12F and 12B described later can be used.

(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 leg side and are spaced apart. The separation distance L8 can be about 150 to 250 mm. Although not shown in the drawings, the exterior body can be an integral body that continues from the abdomen to the back via the crotch, and in this case, the above-described crotch cover sheet 12M can be omitted. That is, the exterior bodies 12F and 12B that individually configure the front body F and the back body B in the present invention correspond to the former form, and the exterior body that integrally configures the front body F and the back body B to the latter form. Equivalent to.

  The exterior bodies 12 </ b> F and 12 </ b> B have a trunk periphery that is a longitudinal range corresponding to the first region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the second region L, but the rear exterior body 12B extends from the first region T to the second region L side. have. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the first region T to the second region L, a configuration that does not provide the collar cover portion although the inguinal cover portion is provided, or the front exterior body 12F. And the part corresponding to 2nd area | region L does not need to be provided in both the rear side exterior bodies 12B. In the illustrated embodiment, the lower edge of the collar cover portion 14 is curved, but may be formed in a straight line along the width direction, like the lower edge of the front exterior body 12F.

  As shown in FIGS. 3 to 5, the exterior bodies 12 </ b> F and 12 </ b> B are formed by laminating two sheet materials 12 </ b> S and 12 </ b> H and joining them by a joining means such as a hot melt adhesive or welding. The inner sheet material 12H positioned on the inner side extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside. The folded portion 12r extends so as to cover up to the end on the waist side of the interior body 200.

The sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. 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. When using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² .

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

  And in the exterior bodies 12F and 12B, in order to improve the fit with respect to the trunk circumference, elongated elastic elastic members 15 to 17 and 19 such as thread rubber are provided between the sheet materials 12S and 12H at a predetermined elongation rate. Yes. As the elongated elastic elastic members 15 to 17 and 19, synthetic rubber or natural rubber may be used. For bonding the sheet materials 12S and 12H of the exterior bodies 12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched between them, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. be able to. It is not preferable to firmly fix the entire exterior body 12F, 12B because the texture of the sheet is impaired. By combining these, it is preferable that the elongated elastic elastic members 15 to 17 and 19 are firmly bonded and the other portions are not bonded or are bonded weakly.

More specifically, between the inner surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the exterior bodies 12F and 12B, the entire width direction is continuous. A plurality of waist edge elastic elastic members 17 are fixed in a state where they are spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or a plurality of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower part U may overlap with the interior body 200 or may overlap with the interior body 200. You may each provide in the width direction both sides except a direction center part. The waist edge elastic elastic member 17 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 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  In addition, between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the waist lower part U of the exterior bodies 12F and 12B, except for the central portion in the width direction overlapping the interior body 200, A plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member, which are continuous in the entire width direction at each part on both sides in the width direction, are spaced apart in the vertical direction and have a predetermined elongation rate. It is fixed in the state extended | stretched along the width direction.

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

  Moreover, the width direction except for the center part of the width direction which overlaps with the interior body 200 between the outer surface of the inner sheet material 12H and the inner surface of the outer sheet material 12S in the collar cover portion 14 of the rear exterior body 12B. A plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are provided in each part on both sides so as to be continuous over the entire width direction, spaced vertically and along the width direction at a predetermined elongation rate. It is fixed in the extended state.

The cover elastic elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and stretch ratios of 150 to 300%, particularly 180 to 260%, respectively.

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

  As shown in the drawing, the waist lower elastic elastic members 15 and 19 and the cover elastic elastic member 16 are respectively provided on both sides in the width direction except for a part or the whole of the portion overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. The elastic elastic member is finely cut in part or all of the part, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction serve as the contraction force acting part. A configured form is also included. Of course, the arrangement of the waist lower elastic elastic members 15 and 19 and the cover elastic elastic member 16 is not limited to the above example, and the elastic force acts on the entire width direction including the portion overlapping the interior body 200. The waist lower elastic elastic members 15 and 19 and the cover elastic elastic member 16 may be partially or entirely provided from one side to the other side in the width direction across the interior body 200.

(Temporary fixing part)
Characteristically, as shown in FIG. 11, at least a part of the inner surface on the front body F side and the inner surface on the rear body B side facing each other is detachably joined by a joining means 80 b to provide a temporary fixing portion 80. Yes. As the joining means 80b, a hot melt adhesive, welding means such as ultrasonic sealing or heat sealing, an adhesive, or the like can be used. This makes it difficult for the waist opening WO and the leg opening LO to open before use, and also makes it difficult for the facing surface of the interior body 200 to open, so that it is difficult for other articles or the like to enter inside. At the time of use, it can be set as a use form by peeling the site | part joined by the joining means 80b.

  The part to which the temporary fixing portion 80 is joined is not particularly limited, and may be the exterior bodies 12F and 12B or the interior body 200. However, as shown in the figure, the absorbent body 56 at the end on the waist side of the interior body 200 is provided. A portion that is not provided and is not provided with the elastic elastic members 15 to 17 and 19 on the exterior bodies 12F and 12B is preferable because a peeling mark of the temporary fixing portion 80 is difficult to hit the skin during use. This form includes a form in which the front and back end surfaces of the interior body 200 are joined together, as well as a form in which the exterior bodies 12F and 12B folded portions 12r covering the front and back ends of the interior body 200 are joined.

  On the other hand, in order to improve the portability, as shown in FIGS. 8 to 11, at least the intermediate portion in the front-rear direction of the second region L is folded between the front and rear side portions so that the folded portion 70 is formed. It is the preferred form that is formed. In this way, the second region L, which is the crotch portion, is folded inward to form the folded portion 70, whereby the vertical length of the product is shortened, the shape is close to a rectangle, and the thickness is partially Although it increases, the stiffness becomes stronger, and the second region L is folded inward, so that the maintainability of the folded shape is also high. Therefore, it is excellent in portability. At the time of use, as shown by the two-dot chain line in FIGS.

  However, when such a folded portion 70 is formed, the waist opening WO and the leg opening LO are likely to be opened due to the increase in the inner thickness and the spring action of the folded portion 70. Therefore, in such a form, when the temporary fixing portion 80 is provided as in the present invention, the waist opening WO and the leg opening LO are difficult to open, and the facing surface of the interior body 200 is also difficult to open. Etc. are preferable because they are difficult to enter. Of course, it is possible to adopt a general two-fold configuration without forming the folded portion 70.

  The folding depth 70d of the folded portion 70 may be determined as appropriate, but if it is too shallow, the folded portion 70 may come out without permission and the folded state may not be maintained. It is desirable to fold in a range of 5% or more and 45% or less. Further, when the folding edge 70e on the opposite surface of the folded portion 70 is positioned in the second region L, the folding depth 70d is relatively shallow, so that the manufacturing is facilitated (particularly as in the manufacturing method described later). However, when it is folded deeply so as to be located in the first region T, the front body F and the back body B are joined to each other by the side seal portion 12A to form an annular shape. Therefore, the maintainability of the folded shape is higher.

  In order to further improve the maintainability of the folded state, as shown in FIG. 11, at least a part of the opposed surface of the folded portion 70 (preferably the lower end portion) is preferably detachably joined by the joining means 70b. is there. As this joining means 70b, hot melt adhesive, welding means such as ultrasonic sealing and heat sealing, mechanical fasteners, adhesives and the like can be used. At the time of use, the part joined by the joining means 70b is peeled off, and the folded part 70 is brought out to the outside, so that it can be used.

<Manufacturing method>
FIG.12 and FIG.13 has shown an example of the manufacturing method of the underpants type disposable diaper mentioned above. This production line has a lateral flow configuration in which the diaper width direction is the MD direction (machine direction, line flow direction), and the rear stretch body 12F and the rear exterior body 12B that become the ventral exterior body 12F here. The side elastic band 12b is formed, and the interior body 200 manufactured by another line is attached to the front elastic band 12f and the rear elastic band 12b. The front side elastic band 12f and the rear side elastic band 12b correspond to the front outer band and the rear outer band of the present invention. In addition, in order to make an explanation easy to understand, members that are continuous in the manufacturing process are also denoted by the same reference numerals as those after manufacture.

  More specifically, the production line includes an elastic member attaching step 301, an elastic member cutting step 302, an exterior cutting and dividing step 304, a leg opening cutting step 305, an interior body attaching step 306, and a side joining and separating step 310. In addition, an interior body folding process for folding the interior body 200 supplied to the interior body attachment process 306 is included, and among these, the interior body folding process is a characteristic process compared to the conventional process.

  That is, in the elastic member attaching step 301, a belt-like sheet material 12S having a predetermined width is conveyed along the continuous direction, and the elastic expansion / contraction of thread rubber or the like is performed almost entirely at intervals in the CD direction of the sheet material 12S. The members 15 to 17 and 19 are fixed in an extended state in the MD direction, and further, a belt-like sheet material 12H having a predetermined width is supplied and bonded to the upper surface along the continuous direction. Both ends in the CD direction are folded back toward the center in the CD direction to form an elastic band. In the illustrated example, it is assumed that two sheet materials 12S and 12H are bonded together and the elastic elastic members 15 to 17 and 19 are sandwiched. However, one sheet material is folded in half or C to be elastically expanded and contracted. A member can also be clamped. Further, at least one end portion in the CD direction of one sheet material can be folded back to the back side (opposite side of the facing surface) of the other sheet material.

  Next, an elastic member cutting step 302 is performed on the formed elastic band as necessary, with a predetermined interval in the MD direction, and elastic elastic members 15, 16, which are located in a portion CT that overlaps the interior body 200 later. 19 is cut by a cutting device such as heat embossing so that the elastic force of the elastic elastic members 15, 16, 19 does not act on the portion CT.

  Next, in the exterior cutting and dividing step 304, a slitter cuts a predetermined portion SL in the middle of the CD direction in the elastic band along the MD direction, and divides it into a front elastic band 12f and a rear elastic band 12b, and the front elastic band 12f. And the space | interval of the rear side elastic band 12b is expanded to predetermined distance. In the illustrated example, the front elastic band 12f and the rear elastic band 12b are formed as an integral elastic band and then divided separately in the exterior cutting and dividing step 304. However, the front elastic band 12f and the rear elastic band 12b are separately separated. It is possible to omit the cutting and dividing step 304 by using the sheet material, and in that case, the two sheet materials are bonded together to sandwich the elastic elastic member, and one sheet material Can be folded in half or C-folded to hold the elastic elastic member, or at least one end in the CD direction of one sheet material can be folded back to the back side (opposite the opposite surface) of the other sheet material. .

  After this exterior cutting and dividing step 304, if necessary, at least one of the front elastic band 12f and the rear elastic band 12b is cut off at the center edge in the CD direction (the portion that becomes the edge Le of the leg opening) in a curved shape. A leg opening cutting step 305 is performed. In the illustrated embodiment, only the center edge in the CD direction of the rear elastic band 12b is cut off in a curved shape, but the front elastic band 12f can also be cut off, and if the trim loss is completely eliminated, a leg opening cutting step is performed. It can be omitted.

  On the other hand, at the same time as these processes, after assembling the unfolded interior body by a known method in the interior body assembly process in another line, in the interior body folding process, front and back so that the surfaces overlap each other in a single state The folding interior body 200 is assembled by folding in the direction and joining at least a part of the opposing surface so as to be peelable by the joining means 80 b to form the temporary fixing portion 80. In addition to folding the interior body 200 in the front-rear direction, the interior body 200 can be folded in a W shape. In the former case, it can be carried out by folding with a known sailor, and in the latter case, it can be carried out by combining folding means such as a known sailor. The joining means 80b can be provided on the surface of the interior body before folding or simultaneously.

  FIG. 13 shows an example of the inner body folding process in which the inner body 200 is folded into a W shape to form the folded portion 70. In this example, the inner body 200 in the unfolded state manufactured by a known technique is shown. , A bonding means 80b for forming the temporary fixing portion 80 is provided on the surface thereof, and the temporary fixing portion 80 is formed by folding both sides in the CD direction toward the center in the CD direction by a known sailor. . Next, after providing the above-mentioned joining means 70b on the back surface of the interior body 200 as necessary, the transfer direction is rotated 90 degrees so as to transfer along the front-rear direction, and then the back side of the intermediate portion in the MD direction (the tip) The inner body 200 as a whole is folded into a W shape by being folded in half by a push-in type sailor 400 from the side opposite to the folding side of the inner side, and then the transfer direction is rotated 90 degrees and transferred again along the width direction. After that, it is supplied to the interior body attaching step 306. When the joining means 70b is a hot melt adhesive or pressure-sensitive adhesive, the joining means 70b is discharged from a discharge port provided at a suitable position on the outer surface of the sailor 400, the interior body 200 is folded, and the joining means 70b is applied to the interior body 200. You can also

  FIG. 14 shows another interior body folding process in which the interior body 200 is folded into a W shape to form the folded portion 70. In this example, the interior body in an unfolded state manufactured by a known technique is shown. While moving the body 200 along the front-rear direction, two pushing plates 401 arranged with a gap in the MD direction from the front side and three pieces arranged with a gap in the MD direction from the back side The pushing plate 402 is pushed so as to mesh with each other and folded into a W shape, and the joining means 70b made of hot melt adhesive or adhesive is discharged from a discharge port provided at a suitable position on the outer surface of the pushing plates 401, 402. After applying the joining means 80b and 70b to the inner body 200, the front-side pushing plate 401 is separated from the rear-side pushing plate 402, and the inner body 200 folded into a W shape is placed on the back side. While it placed on push plate 402, the rotation movement of the back side of the push plate 402 from changing the transfer direction to transfer along the width direction, and supplies to the inner body attaching step 306.

  Furthermore, as shown in FIG. 15, an interior body assembly process in which the interior body 200 is assembled while being transported in the width direction of the product can also be employed. That is, in this step, the absorbent body 56 is supplied on the strip-shaped packaging sheet 58 at a predetermined interval in the MD direction, and the upper portion is covered with the strip-shaped packaging sheet 58 to form a portion that becomes the absorbent element 50. The strip-shaped liquid-impermeable sheet 11 is supplied to either the front or back side, and the strip-shaped top sheet 30 is supplied to the other side and bonded to each other. Further, both sides in the MD direction are individually gathered on the top sheet 30 side. Are attached at predetermined intervals in the MD direction. Thereafter, a joining means for temporary fixing is provided if necessary, and folding (interior body folding process) is performed by a sailor, and then cutting is performed at the boundary of the portion that becomes the individual interior body 200, thereby individual interiors. Obtain body 200.

  Folding by a sailor can be folded in the CD direction or folded in a W shape. FIG. 16 shows a method for folding into a W shape. In this method, after attaching the above-described three-dimensional gather assembly 600, first, a double folded band 90 is formed by folding in the center in the CD direction, and the lower end of the folded portion 70 between the two folded bands 90 and In this position, the pair of front and rear upper guide bars 101 and 102 are linearly passed along the MD direction, and the upper guide bars 101, The lower guide bar 103 that rises to the upper side from 102 is disposed, and when the bi-fold band 90 passes through the upper guide bars 101 and 102 and the lower guide bar 103, the portion including the double fold in the bi-fold band 90 The folded portion 70 is formed by being in contact with the lower guide bar 103 and being pushed between the front and rear side portions. It is. In addition, the vertical direction expression in this description is based on the vertical direction when the diaper is mounted, and is not based on the vertical direction of the equipment.

  On the other hand, in the interior body attaching step 306, the folded interior body 200 is transported at an interval in a posture in which the width direction is the MD direction, and both front and rear sides thereof (meaning front and rear as the direction of the diaper, and therefore, as equipment, It is sandwiched between the front stretchable band 12f and the rear stretchable band 12b from both sides of the CD direction and the top and bottom stretchable bands 12b, and the folded interior 200 is joined to the front stretchable band 12f and the rear stretchable band 12b to form individual diapers. The interior assembly which a part continues in MD direction in a folded state is formed. These joining and fixing can be performed by appropriate means such as a hot melt adhesive or heat sealing.

  Thereafter, in the side joining and detaching step 310, the front elastic band 12f and the rear elastic band 12b are bonded to each side part of the diaper to form the side seal part 12A, and the front elastic band 12f. And the back side elastic band 12b is cut | disconnected in the boundary of each diaper, and each diaper DP is obtained. It is included in the present invention that the side joining step and the separation step are performed sequentially or simultaneously. According to this manufacturing method, by folding the interior body 200 in advance in the interior body assembly process and forming the temporary fixing portion 80, the folding process that has conventionally been performed after joining the interior body 200 can be omitted. Furthermore, a pants-type disposable diaper having a folded portion 70 can be manufactured by folding the interior body 200 into a W shape.

<Sensory evaluation>
A commercially available product (comparative example) having no folded portion shown in Table 1 and a sample (example) in which a folded portion is formed in the same manner as the forms shown in FIGS. We evaluated which was superior in carrying characteristics. The portability was confirmed by actually touching the appearance. As a result, 86% of the respondents answered that the sample of the example had better portability. In addition, the product vertical dimension in a table | surface means the vertical direction length from the edge of a waist opening to the edge of a crotch side in the product state which joined the side seal part.

<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%.

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, calculate the weight per square meter, and use it as the basis weight.

-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

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

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

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impermeable sheet | seat, 12F, 12B ... Exterior body, 12A ... Side seal part, 12r ... Folded part, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 12F ... front exterior body, 12B ... rear exterior body, F ... front body, B ... back body, T ... first region, L ... second region , 14 ... buttocks cover part, 70 ... folding part, 70d ... folding depth, 70e ... folding edge, WO ... waist opening, LO ... leg opening, W ... waist edge part, 80 ... temporary fixing part, 90 ... two-fold band shape 301, elastic member attaching step, 302 ... elastic member cutting step, 304 ... exterior cutting and dividing step, 305 ... leg opening cutting step, 306 ... interior body attaching step, 307 ... exterior folding step, 309 ... folding Viewed portion formation step, 310 ... side bonding and disconnecting step.

Claims (8)

Provided on the inside of the front exterior body and the rear exterior body so as to extend from the front exterior body to the rear exterior body through the crotch part from the front exterior body and the rear exterior body that constitutes the front body And the inner body containing the excrement absorber, and the side seal portion is formed by joining the both sides of the front exterior body and the both sides of the rear exterior body, thereby opening the waist. And in the manufacturing method of the pants type disposable diaper in which the leg opening is formed,
The front exterior belt-like body that repeats continuously in the MD direction so that the width direction and the MD direction of the portion that becomes the front exterior body and the portion that becomes the rear exterior body match the width direction and the MD direction. Forming an exterior exterior belt-like body that is continuously repeated in the MD direction,
After producing the interior body, the interior body assembly step of assembling the folded interior body by folding in the front-rear direction so that the surfaces overlap each other in a single state,
The folded inner body is transported at an interval with the width direction thereof being the MD direction, and is sandwiched between the front exterior belt-like body and the rear exterior belt-like body from both front and rear sides thereof, and the folded interior body and the front exterior belt-like body An interior body attaching step for joining the body and the rear exterior belt-like body;
The front outer strip and the rear outer strip are joined at both side portions of each diaper, and the front outer strip and the rear outer strip are cut at the boundary of each diaper. Obtaining a side joining and disconnecting step;
Including
In the inner body assembly process, the front and rear of the opposing surface of the folded inner body in the direction, the elastic definitive with no portion of the absorbent body at the end of the west side, and the front outer body and rear outer body stretching The part that will overlap with the part where the member is not provided is releasably joined to form a temporary fixing part,
A method for producing a pants-type disposable diaper, characterized in that Provided on the inside of the front exterior body and the rear exterior body so as to extend from the front exterior body to the rear exterior body through the crotch part from the front exterior body and the rear exterior body that constitutes the front body And the inner body containing the excrement absorber, and the side seal portion is formed by joining the both sides of the front exterior body and the both sides of the rear exterior body, thereby opening the waist. And in the manufacturing method of the pants type disposable diaper in which the leg opening is formed,
The front exterior belt-like body that repeats continuously in the MD direction so that the width direction and the MD direction of the portion that becomes the front exterior body and the portion that becomes the rear exterior body match the width direction and the MD direction. Forming an exterior exterior belt-like body that is continuously repeated in the MD direction,
After producing the interior body, the interior body assembly step of assembling the folded interior body by folding in the front-rear direction so that the surfaces overlap each other in a single state,
The folded inner body is transported at an interval with the width direction thereof being the MD direction, and is sandwiched between the front exterior belt-like body and the rear exterior belt-like body from both front and rear sides thereof, and the folded interior body and the front exterior belt-like body An interior body attaching step for joining the body and the rear exterior belt-like body;
The front outer strip and the rear outer strip are joined at both side portions of each diaper, and the front outer strip and the rear outer strip are cut at the boundary of each diaper. Obtaining a side joining and disconnecting step;
Including
In the interior body assembling step, the interior body is folded into a W shape so that a middle part in the front-rear direction of the interior body forms a folded portion that is folded between the front and rear sides, and the folding Bonding at least a part of the opposing surfaces of the parts in a peelable manner,
A method for producing a pants-type disposable diaper characterized by the above. The waist opening and the leg opening are formed by joining the both sides of the front body and the both sides of the back body to form the side seal part,
A first region defined as a front-rear direction range having a side seal portion, and a second region defined as a front-rear direction range of a portion forming a leg opening,
At least the front-rear direction intermediate part of the second region is folded between the front and rear side parts to form a folded part,
At least a part of the facing surface of the folded portion is joined in a peelable manner,
At least a part of the inner surface on the front body side and the inner surface on the rear body side facing each other has a temporary fixing portion that is releasably bonded.
A pants-type disposable diaper characterized by that. An interior body that individually or integrally configures the front body and the back body, and an interior of the excrement absorber provided inside the exterior body so as to extend from the front body to the back body through the crotch. A waist opening and a leg opening are formed by joining the both sides of the outer body of the front body and the both sides of the outer body of the rear body to form a side seal part,
In the part having the end on the waist side of the interior body, a temporary fixing portion is provided in which at least a part of the inner surface on the front body side and the inner surface on the rear body side facing each other are detachably joined,
The portion where the temporary fixing portion is provided is a portion where the interior body does not have an absorber and a portion where the elastic body is not provided on the exterior body.
A pants-type disposable diaper characterized by that. A first region defined as a front-rear direction range having a side seal portion, and a second region defined as a front-rear direction range of a portion forming a leg opening,
The pants-type disposable diaper according to claim 4, wherein at least a middle part in the front-rear direction of the second region is folded between the front and rear side parts to form a folded part.   The pants-type disposable diaper according to claim 5, wherein at least a part of the opposing surface of the folded portion is detachably joined.   The pants-type disposable diaper according to claim 5 or 6, wherein a folded edge of a facing surface of the folded portion is located in the second region.   The pants-type disposable diaper according to claim 5 or 6, wherein a folded edge of a facing surface of the folded portion is located in the first region.

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