JP2016059608A - Pants-type disposable diaper and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pants-type disposable diaper and its manufacturing method in which the fitting property of the edge of a leg girth of an exterior body is improved.SOLUTION: In the pants-type disposable diaper, a folded portion 12 W is formed by folding back and fixing a portion of a leg opening side in a back side flexible band 12b once or several times in zigzag in the CD direction before cutting in the boundary of individual diapers after the inner body mounting step 307. As moving from this folded-back portion to the center side in the width direction, the folded-back portion expands to the lower side and fixed to the inner body in an expanded state. Also, an elongated oblique resilient elastic member fixed in an extended state along the direction moving to the side edge of the lower side from the folded-back portion in the inner body is provided. The joining of the side edge for the ventral outer surface component with the side edge for the back side outer surface component and the fixation of the folded-back portion are integrally performed by welding processing. Thus, a pants-type disposable diaper and its manufacturing method are provided.SELECTED DRAWING: Figure 16

Description

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

  As one form of the pants-type disposable diaper, both sides of the abdominal exterior body and both sides of the back exterior body are joined to form a cylindrical shape, and the center in the width direction of the inner surface of the abdominal exterior body To the central portion in the width direction of the inner surface of the back side exterior body, and an interior body that absorbs excrement, and the abdominal side exterior body and the back side exterior body are separated from each other without being continuous on the crotch side The thing is known (for example, refer patent documents 1-4). 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.

  On the other hand, an exterior integrated type having an integral exterior body from the abdominal side to the back side is also known (see, for example, Patent Documents 5 and 6).

  However, conventional pants-type disposable diapers have room for improvement in the fit of the edges around the legs of the exterior body. In particular, the exterior two-part type has a problem that the fit of the edge around the leg is impaired as the cut area of the leg opening is reduced in order to reduce trim loss.

Special table 2007-511326 gazette Japanese Patent Laying-Open No. 2005-279077 JP 2010-162277 A JP 2014-4492 A JP 2011-189068 A Japanese Patent Laid-Open No. 11-290380

  Then, the main subject of this invention is improving the fitting property of the edge part around the leg of an exterior body.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior having a ventral exterior part and a back exterior part, wherein a side edge part of the abdominal exterior part and a side edge part of the back exterior part are joined on both sides in the width direction to form a waist opening. Body,
An interior body provided such that a front portion is joined to a central region in the width direction of the abdominal exterior portion and a rear portion is joined to a central region in the width direction of the back exterior portion, so as to pass through the crotch of the wearer. And comprising
In the pants-type disposable diaper in which at least part of the edge of the leg opening is formed by the edge of the portion located on both sides in the width direction of the interior body in the exterior body,
In at least one exterior part of the ventral exterior part and the back exterior part;
In the lower edge of the side edge corresponding region corresponding to the side edge and the front-rear direction, portions located on both sides in the width direction of the interior body form the edge of the leg opening,
The lower portion of the side edge corresponding region is a folded portion that is fixed by being folded once or a plurality of times in a zigzag manner at the side edge portion, and from the folded portion toward the center in the width direction. The folded portion gradually expands downward as it is fixed to the interior body in the state where it is halfway or completely expanded downward in the central portion in the width direction, and the folded portion in the interior body from the folded portion. An elongated slanted elastic elastic member fixed in an extended state along the direction toward the side edge below the part is provided,
The joining of the side edge of the ventral exterior part and the side edge of the back exterior part, and the fixing of the folded part are made integrally by welding,
A pants-type disposable diaper characterized by that.

(Function and effect)
When configured in this way, in at least one of the abdominal exterior part and the back exterior part, the edge of the leg opening located on the side of the interior body is obliquely upward toward the side edge, and the edge Since the slant elastic elastic member is fixed in an extended state along the rim, the edge of the leg opening fits well around the wearer's buttocks and along the buttocks without loosening. Further, it is not necessary to separately fix the folded portion.

<Invention of Claim 2>
The exterior body is formed by joining both sides of the abdominal exterior body forming the abdominal exterior part and both sides of the back side exterior body forming the back side exterior part. The pants-type disposable diaper according to claim 1, wherein the side exterior body is spaced apart from the crotch side without being continuous.

(Function and effect)
In general, in such an exterior two-part type, in order to reduce trim loss, as the cut area of the leg opening is reduced, the fit of the edge around the leg is impaired. Due to the characteristic structure of the deployment, the edge of the leg opening is shaped around the wearer's buttocks and around the buttocks. Good) can be formed. Therefore, while the edge of the leg opening can be formed in a shape along the periphery of the buttock or the buttock, there is no trim loss in manufacturing the exterior body or less than the conventional one. Conventionally, so-called rocking attachment is performed when an elongated elastic expansion / contraction member is arranged obliquely or curved along the edge of the leg opening, but as can be seen from the manufacturing method described later, the present invention Then, it is possible to attach the elongated elastic elastic member in an oblique direction without performing swing attachment.

<Invention of Claim 3>
The pants-type disposable diaper according to claim 2, wherein the folded portion is formed to be folded inside the at least one exterior portion.

(Function and effect)
When the folded portion is formed on the inner side in this way, the portion where the folded portion is developed does not easily float from the skin and fits tightly to the skin. In particular, when the folded portion is formed on the backside exterior body, the portion where the folded portion is developed has a three-dimensional shape that covers the roundness of the buttocks.

<Invention of Claim 4>
The pants-type disposable diaper according to claim 2, wherein the folded portion is formed to be folded outside the at least one exterior portion.

(Function and effect)
When the folded portion is formed on the outside in this way, the portion where the folded portion is developed comes to fit gently with a weak force against the skin.

<Invention of Claim 5>
The pants type disposable diaper according to any one of claims 2 to 4, wherein the at least one exterior portion is the back exterior body.

(Function and effect)
In this case, the folded portion can be covered along the bulge of the buttock by the portion where the folded portion is developed. This effect is particularly remarkable in the case of the invention described in claim 3.

<Invention of Claim 6>
The pants-type disposable according to any one of claims 2 to 4, wherein the folded portion is formed only on one of the exterior portions, and the folded portion extends to the outside of the other exterior portion. Diapers.

(Function and effect)
This configuration is suitable for increasing the angle of the edge of the leg opening.

<Invention of Claim 7>
The shape of the said at least one exterior part is a underpants type disposable diaper of any one of Claims 2-6 which is a rectangle in the state which expand | deployed the said folding | turning part.

(Function and effect)
By setting it as such a shape, the trim loss in manufacture of an exterior body can be eliminated, although the edge of a leg opening part can be made into the shape along the circumference | surroundings of a collar part or a collar part.

<Invention of Claim 8>
Stretch band forming step for forming a belly side stretch band and a back side stretch band formed by fixing an elastic stretch member in a stretched state along the continuous direction to a sheet material continuous in a belt shape,
While the abdominal stretch band and the back stretch band are transferred in parallel in the CD direction with a gap therebetween, separately manufactured interior bodies are supplied with a gap in the MD direction, and the front part of the interior body is supplied to the abdomen. An interior body attaching step, in which a side stretchable band and a rear portion of the interior body are joined to the back stretchable band to form an interior assembly; and
Folding the interior assembly in half in the CD direction;
Joining the abdominal stretch band and the back stretch band at the parts that will be both sides of each diaper, cutting the abdominal stretch band and the dorsal stretch band at the boundary of each diaper, Obtaining a side joining and disconnecting step;
In the manufacturing method of the pants-type disposable diaper including
After the interior body attaching step and before cutting at the boundary of each individual diaper, the leg opening side portion of at least one elastic band is fixed once in the CD direction or a plurality of zigzags. And forming a folded portion, including a folding step,
A method for producing a pants-type disposable diaper, characterized in that

(Function and effect)
According to this manufacturing method, what has the same advantage as the underpants type disposable diaper of Claim 1 can be manufactured except the welding fixation of a folding | turning part. Therefore, substantially the same effect as that of the first aspect of the invention can be achieved. The term “MD direction” means the machine direction (transfer direction), and the CD direction means a lateral direction orthogonal to the MD direction.

<Invention of Claim 9>
The pants-type disposable according to claim 8, wherein, prior to the folding step, an adhesive is applied to a portion of the at least one elastic band that fixes the folded portion, and the folded portion is fixed by the adhesive in the folding step. Diaper manufacturing method.

(Function and effect)
In this way, by applying adhesive in advance and fixing the folded portion, it can be fixed as it is when folded, so it is necessary to maintain the folded state compared to the method that is performed simultaneously in the welding process of the side joining and disconnecting step described later There is an advantage that it can be easily manufactured.

<Invention of Claim 10>
Prior to joining the ventral stretch band and the back stretch band in the side joining and disconnecting step, the folding step in the folding step is performed, and the folded state is maintained while maintaining the folded state. The manufacturing method of the underpants type disposable diaper of Claim 8 which joins and fixes the said folding | returning part simultaneously by welding process.

(Function and effect)
According to this manufacturing method, the underpants type disposable diaper of Claim 1 can be manufactured. In addition, as compared with the method of applying an adhesive in advance and fixing the folded portion as described above, the bonding process is not necessary, and the manufacturing method can be simplified and the material cost can be reduced by the amount of the adhesive. In addition, it is possible to suppress the hardening of the exterior body by reducing the amount of adhesive used.

  As described above, according to the present invention, there are advantages such as improved fit of the edge around the legs of the exterior body.

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 sectional drawing which shows only the principal part of an underpants type disposable diaper with a dimension. It is a front view of the expansion state of a pants type disposable diaper. It is a front view of the expansion state of a pants type disposable diaper. It is a photograph of a sample of a pants-type disposable diaper. It is the schematic of the cross section of the 6-6 line position of FIG. 7, and the 7-7 line position in various forms. It is the schematic of the cross section of the 6-6 line position of FIG. 7, and the 7-7 line position in various forms. It is the schematic of the cross section of the 6-6 line position of FIG. 7, and the 7-7 line position in various forms. It is a front view of the expansion state of a pants type disposable diaper. It is a front view of the expansion state of a pants type disposable diaper. It is a top view which shows a manufacture flow. It is a top view which shows a manufacture flow. It is a top view which shows a manufacture flow. It is a top view which shows a manufacture flow.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<Example of pants-type disposable diapers>
1-10 (a) has shown an example of the underpants type disposable diaper. This pants-type disposable diaper has a cylindrical shape in which both side edges in the width direction of the abdominal exterior body 12F and both side edges in the width direction of the back side exterior body 12B are joined along the vertical direction by heat sealing, ultrasonic welding, or the like. The exterior bodies 12F and 12B are formed, and the front end portion of the interior body 200 is connected to the inner surface of the center portion in the width direction of the abdominal exterior body 12F in the exterior bodies 12F and 12B by a hot melt adhesive or the like. The rear end portion of the interior body 200 is connected to the inner surface of the center portion in the width direction of the body 12B by a hot melt adhesive or the like. Reference numeral 12A denotes a joint portion (side seal portion) between the ventral exterior body 12F and the back exterior body 12B. Moreover, the code | symbol Y has shown the full length (vertical direction length from the edge of the waist opening part of the front body F to the edge of the waist opening part of the back body B) in the expansion | deployment state, and the code | symbol X is a diaper in the expansion | deployment state. The full width of 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 addition, although the dot pattern part in a figure has shown the hot-melt-adhesive which joins each structural member, the welding process (heat seal and ultrasonic seal) which joins by welding of an object member can also be used. Hot melt adhesive is applied in a pattern such as solid, bead, curtain, summit or spiral, and the fixed part of the elastic elastic member is used instead of or together with the outer peripheral surface of the elastic elastic member such as comb gun or sure wrap application. Application to can also be employed.

  The upper openings of the exterior bodies 12F and 12B serve as waist openings through which the wearer's torso passes, and the portions surrounded by 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. It becomes a leg opening through which the leg passes. In a state where the welded portions 12A of the exterior bodies 12F and 12B are peeled off and developed, the intermediate portions in the front-rear direction are constricted as shown in FIGS. The interior body 200 extends from the back side through the crotch to cover the abdominal side, and is a part that receives the excrement and absorbs and holds the liquid, and the exterior bodies 12F and 12B are interior bodies. It is a part which supports 200 with respect to a wearer.

(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 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 and to prevent reversal. Reference numeral 60 denotes a three-dimensional gather 60 that is provided on both sides of the interior body 200 and stands on the body side in order to prevent excrement from leaking on both sides of the interior body 200.

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

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

  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 liquid penetration. 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 in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{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 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to improve leakage resistance. 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. In the illustrated embodiment, it is provided so as to stand up from the side portion of the interior body 200, and the base side portion rises obliquely toward the center in the width direction, and is on the tip side from the intermediate portion. This part stands up diagonally toward the outside in the width 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 while it is set as the front-and-rear fixing | fixed part 67 fixed by the hot-melt-adhesive agent or the heat seal with respect to the side part surface of the top sheet 30 in the lying state in the front-back direction among protrusion parts 66, between these, The intermediate portion in the front-rear direction is a non-fixed free part, and an elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the figure, a waterproof film 64 can be interposed between the gather sheets 62 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, 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 parts, only the free parts stand on 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. 6, 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 60 can be provided in double (two rows) on the left and right sides of the interior body 200.

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

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

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

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

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the 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 have a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening to the upper end of the leg opening) having the side seal portion 12A, and a front-rear direction of a portion forming the leg opening And an intermediate portion L defined as a range (between a longitudinal region having the side seal portion 12A of the ventral exterior body 12F and a longitudinal region having the side seal portion 12A of the back exterior body 12B). The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that is a lower part than this. Usually, when there is a boundary (for example, the thickness or elongation rate of the elastic elastic member changes) in the waistline portion T, 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, the intermediate portion L can be omitted, and can be provided on both the abdominal exterior body 12F and the back exterior body 12B. However, in the illustrated embodiment, the intermediate portion L is provided only on the back exterior body 12B, The form which covers is adopted. If the edge Le on the leg side of the intermediate portion L is formed in a curved shape so as to follow the leg circumference, the fit with respect to the leg circumference becomes good.

  The exterior bodies 12F and 12B are composed of an abdominal exterior body 12F and a back exterior body 12B, and the abdominal exterior body 12F and the back exterior body 12B are not continuous on the leg side and are separated from each other. The separation distance L8 can be about 150 to 250 mm.

  As shown in FIGS. 3 to 5, the exterior body 12 is formed by bonding two sheet materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot-melt adhesive, and is an inner sheet positioned on the inner side. The material 12H extends only to the edge of the waist opening, but the outer sheet material 12S wraps around the edge of the inner sheet material 12H on the waist side and is folded inside, and the folded portion 12W is an interior body. It extends so as to cover up to 200 on the waist end.

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 .

  As shown in FIGS. 2 and 5, the elastic body members 15 to 19 for improving the fit with respect to the trunk are provided between the sheet materials 12 </ b> S and 12 </ b> H in the ventral exterior body 12 </ b> F and the back exterior body 12 </ b> B. It is provided at a predetermined elongation rate.

  As elastic elastic members 15-19, synthetic rubber or natural rubber may be used. In addition, as the elastic elastic members 15 to 19, as shown in the figure, a slender shape such as a thread shape, a string shape, and a belt shape can be used, and a net-like or sheet-like elastic elastic member can also be used. For bonding the sheet materials 12S and 12H of the exterior bodies 12F and 12B and fixing the elastic elastic members 15 to 19 sandwiched between them, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. it can.

When the elongated elastic elastic members 15 to 19 are used, the same elastic elastic member can be provided uniformly, but it is preferable to vary the thickness, interval, and the like according to the positions of the exterior bodies 12F and 12B. For this reason, in the illustrated embodiment, the waist edge portion W is provided with a plurality of waist edge elastic elastic members 17 vertically spaced along the width direction at a predetermined elongation rate so as to be continuous over the entire width direction. It is fixed in the extended state. One or more of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower portion U may overlap with the interior body 200, or may be overlapped with the interior body 200 in the width direction central portion. You may provide more to the side so that it may continue in the width direction. 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. .

  Further, the waist lower portion U includes a plurality of waist lower elastic elastic members 15 and 18 made of an elongated elastic elastic member continuous in the width direction on the upper side of the inner body 200 and on the side of the width direction central portion overlapping the inner body 200. The book is fixed in a state of being stretched along the width direction at a predetermined stretch rate with a space in the vertical direction.

The waist lower elastic elastic members 15 and 18 have 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 It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Characteristically, as shown in FIGS. 7 to 10 (a), the intermediate portion L of the backside exterior body 12B is fixed by being bent back and forth once or plural times in a zigzag manner at the side edge portion. The folded portion 12W is used, and the folded portion gradually expands downward from the folded portion 12W toward the center in the width direction. It is fixed to the body 200 with a hot melt adhesive or the like. The fixed portion of the folded portion 12W is indicated by reference numeral 12k. Moreover, the diagonal elastic expansion-contraction member 19 which consists of an elongate elastic expansion-contraction member fixed in the extended state along the direction which goes to the side edge below the folding-back part 12W in the interior body 200 from the folding | returning part 12W is provided. The oblique elastic expansion / contraction member 19 is provided on the side of the central portion in the width direction that overlaps with the interior body 200, and extends along the width direction when the folded portion 12W is unfolded. Further, in the illustrated form, the upper portion of the intermediate portion L has a plurality of intermediate elastic elastic members 16 made of an elongated elastic elastic member continuous in the width direction laterally from the central portion in the width direction overlapping the interior body 200, It is fixed in a state where it is extended along the width direction at a predetermined extension rate with an interval in the vertical direction.

  In addition to such a folding and unfolding structure, when the diagonal elastic elastic member 19 is provided, in the backside exterior body 12B, the edge Le of the leg opening located on the side of the interior body 200 is at the side edge. Since the slant elastic elastic member 19 is fixed in an elongated state along its edge, the leg Le of the leg opening fits well without loosening around the bulge of the wearer's buttocks To come. FIG. 9A is a photograph of a state in which the sample product of the form shown in FIG. 10B is mounted on the dummy doll, and FIG. It is the photograph of the state which mounted | wore the dummy doll with the commercial item of a division structure. As can be seen from these comparisons, the sample product has a leg opening edge Le in the backside exterior body 12B that fits well against the bulge of the buttock and can cover the buttock better than a commercially available product. It is.

  The folded portion 12W and the oblique elastic elastic member 19 are provided only on the backside exterior body 12B as shown in FIGS. 10 (a) and 13, and as shown in FIG. 11 (b), only on the abdominal side exterior body 12F. Although not shown, it can also be provided on both the ventral exterior body 12F and the back exterior body 12B.

  The folded direction of the folded portion 12W can be the inside as shown in FIG. 10 or the outside as shown in FIG. 11A. If the folded portion 12W is formed by folding inward as in the former, the portion where the folded portion 12W is unfolded hardly floats from the skin and fits tightly to the skin. In particular, when the folded portion 12W is formed on the backside exterior body 12B, the portion where the folded portion 12W is developed has a three-dimensional shape that covers the roundness of the buttocks. On the other hand, when the folded portion 12W is formed by folding outward as in the latter case, the portion where the folded portion 12W is developed comes to fit gently with a weak force against the skin.

  The number of times the folded portion 12W is folded can be determined as appropriate, and is preferably once as shown in FIG. 10 (a), FIG. 11 and FIG. ), When the number of times is set, the portion where the folded portion 12W is expanded becomes wider, so that the heel portion and the heel portion can be covered more widely.

  As shown in FIGS. 7 to 10A, the folded portion 12W is positioned below the side seal portion 12A, specifically, an exterior body that forms the folded portion 12W as shown in the drawing (FIG. In the illustrated example, the back side exterior body 12B) is extended to the leg opening side of the other exterior body and folded within the range of the extended portion, as shown in FIGS. 12 (a) and 14 The side seal portion 12A may be partially or entirely overlapped. As similar to the latter form, as shown in FIG. 12B, both the abdominal exterior body 12F and the back exterior body 12B can be folded back to the abdominal side (or the back side). .

  As shown in FIGS. 7 to 10A, the folded portion 12W is fixed by fixing the folded portion 12W with the adhesive 12p and then integrally welding the side seal portion 12A including the folded portion 12W. In addition to fixing the folded portion 12W by the adhesive 12p and welding, as shown in FIG. 13, the side seal portion 12A is welded without bonding the folded portion 12W with the adhesive, as shown in FIG. The folded portion 12W can also be fixed in a unified manner. Although not shown, in the form in which the folded part 12W is positioned below the side seal part 12A as in the form shown in FIGS. 7 to 10A, only the side seal part 12A is welded, and the folded part 12W is bonded. It can also be fixed only with the agent.

  10-12, the dotted line has shown the lower end of 12 A of side seal parts, for example, in the back side exterior body 12B of the form shown to Fig.10 (a), the trunk periphery T is a side edge of this invention. The portion corresponding region and the intermediate portion L correspond to the lower portion (leg side portion) of the side edge corresponding region of the present invention. Moreover, the dot pattern part in FIGS. 10-12 has shown the hot-melt-adhesive for fixing a folding | returning part.

  On the other hand, as described above, in the present pants-type disposable diaper, the edge Le of the leg opening portion is inclined upward toward the side edge portion due to the folding and unfolding structure. Even if the ventral exterior body 12F and the back exterior body 12B are configured to have a rectangular shape without cutting the edge Le of the part, that is, in a state where the folded portion 12W is unfolded, it will follow the circumference of the leg. In addition, in this case, as can be seen from the manufacturing method described later, trim loss in the manufacture of the exterior bodies 12F and 12B can be completely eliminated.

The intermediate elastic elastic member 16 and the oblique elastic elastic member 19 have 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, a cross-sectional area of 0.05 to 1.5 mm ² , The thread rubber of about 0.1 to 1.0 mm ² is fixed at 5 to 40 mm, particularly about 5 to 10 mm at intervals of about 2 to 10, and the elongation rate is 150 to 300%, particularly 180 to 260%. preferable.

  As shown in the figure, the waist lower elastic elastic members 15, 18, the intermediate elastic elastic member 16, and the diagonal elastic elastic member 19 are respectively provided on both sides in the width direction except for a part or all of the portion overlapping the interior body 200. If it is provided, the interior body 200 will not shrink more than necessary in the width direction, and it will not look bad or lose its absorbency. 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 members 15, 18, the intermediate elastic members 16, and the diagonal elastic members 19 is not limited to the above example, and the elastic force acts on the entire width direction of the waist lower U. In addition, some or all of the waist lower elastic elastic members 15, 18, the intermediate elastic elastic members 16, and the diagonal elastic elastic members 19 can be provided across the interior body 200 from one side to the other side in the width direction.

(Other)
The above example is an example of an exterior two-part structure in which the abdominal exterior body 12F and the back exterior body 12B are separated, but is applied to an exterior body that is continuous from the abdomen to the back via the crotch. You can also The ventral region and the dorsal region in the continuous exterior body correspond to the abdominal exterior body 12F and the backside exterior body 12B described above. Therefore, in the present invention, both are collectively referred to as the abdominal exterior portion and the backside exterior. It is a part.

<Examples of manufacturing methods for pants-type disposable diapers>
FIG.15 and FIG.16 has shown an example of the manufacturing method of the underpants type disposable diaper mentioned above. This production line has a transverse flow configuration in which the diaper width direction is the MD direction (machine direction, line flow direction), and here, the abdominal stretchable band 12f and the dorsal exterior body 12B become the abdominal exterior body 12F. The back side elastic band 12b is formed, and the interior body 200 manufactured by another line is attached to the abdominal side elastic band 12f and the back side elastic band 12b. 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, this production line includes an elastic member attaching step 301, an elastic member cutting step 302, an exterior body cutting and dividing step 303, an interior body attaching step 307, a folding step 308, an adhesive applying step 304, a folding step 305, And the side joining step 309 and the separation step 310, among which the folding step 305 is a characteristic step as compared with the prior art.

  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 19 are fixed while being stretched in the MD direction, and a belt-like sheet material 12H having a predetermined width is further supplied and bonded along the continuous direction on the upper surface thereof to form an elastic band. In the illustrated example, it is assumed that two sheet materials 12S and 12H are bonded and the elastic elastic members 15 to 19 are sandwiched, but the elastic material is folded by folding one sheet material in two or C. It can also be pinched. 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. 18 and 19 are cut by a cutting device such as heat embossing so that the elastic force of the elastic elastic members 15, 16, 18 and 19 does not act on the portion CT.

  Next, in the exterior body cutting and dividing step 303, a slitter cuts the predetermined portion SL in the middle of the CD direction in the stretch band along the MD direction, and divides it into the ventral stretch band 12f and the dorsal stretch band 12b. The distance between the elastic band 12f and the back elastic band 12b is expanded to a predetermined distance. After the slit, if necessary, at least one of the abdominal stretchable band 12f and the back stretchable band 12b can be cut off in the shape of a curve at the center edge on the CD side (the portion that becomes the edge Le of the leg opening). Such trimming is not performed when trim loss is completely eliminated. Nevertheless, as will be described later, the edge Le of the leg opening can be formed along the oblique direction. In the illustrated example, the ventral elastic band 12f and the back elastic band 12b are formed as an integral elastic band and then divided separately in the cutting and dividing step 303. However, the ventral elastic band 12f and the dorsal elastic band are separated. By forming 12b using separate sheet materials, it is possible to omit the cutting and dividing step 304. In that case, the two sheet materials are bonded together to hold the elastic elastic member, and one sheet. The sheet material is folded in half or C-folded to sandwich the elastic elastic member, or at least one end in the CD direction of one sheet material is folded back to the back side (opposite side of the facing surface) of the other sheet material. be able to.

  Next, in the interior body attaching step 307, the interior body 200 manufactured in parallel by a known method in a separate line while transferring the abdominal stretchable band 12f and the back stretchable band 12b in parallel in the CD direction with a gap therebetween. Are supplied at predetermined intervals in the MD direction, and the front part of the interior body 200 is joined to the abdominal stretch band 12f and the rear part of the interior body 200 is joined to the back stretch band 12b. Form an interior assembly. These joining and fixing can be performed by appropriate means such as a hot melt adhesive or heat sealing.

  Next, in the folding step 308, the interior assembly is folded at the center in the CD direction so that the attachment surface of the interior body 200 in the abdominal stretch band 12f and the attachment surface of the interior body 200 in the back stretch band 12b overlap.

  Next, in an adhesive application step 304, an adhesive 12p such as a hot-melt adhesive is applied to the folded portion forming position at a predetermined interval in the MD direction in the leg opening side portion of the back side elastic band 12b. Thereafter, in the folding step 305, the leg opening side portion of the back side stretchable band 12b is folded in the CD direction and fixed with the adhesive 12p applied earlier to form the folded portion 12W. As a result, the edge of the dorsal elastic band 12b in the oblique direction becomes the edge Le of the leg opening.

  Thereafter, in the side part joining step 309, the ventral side elastic band 12f and the back side elastic band 12b are joined to form both side parts of the diaper, and the side seal part 12A is formed. The elastic band 12f and the back elastic band 12b are cut at the boundaries of the individual diapers to obtain individual diapers DP. It is included in the present invention that the side joining step 309 and the separation step 310 are performed sequentially or simultaneously. In the side joining step 309, as shown in the figure, the welding process is integrally performed including the folded portion 12W. When the folded portion 12W is positioned below the side seal portion 12A, the folded portion 12W is formed. The welding process can also be omitted. The structure and advantages of the disposable diaper manufactured in this way are as described above.

  In this example, the adhesive application process 304 and the folding process 305 are performed between the folding process 308 and the side joining process 309, but other processes are performed between the interior body attaching process 307 and the separation process 310. It can also be carried out between processes.

  FIG. 17 shows a manufacturing flow in the case of forming the folded portion 12W in the form of FIG. 14, and the leg opening side portion of the back elastic band 12b is placed on the ventral elastic body 12f in the folding step 305. In this way, the folded portion 12W is formed by folding in the CD direction and fixing with the previously applied adhesive 12p. This form is suitable for increasing the angle of the edge Le of the leg opening. In this embodiment, the adhesive application process 304 and the folding process 305 are performed after the folding process 308. Others are the same as those shown in FIGS. 15 and 16.

  FIG. 18 shows a manufacturing flow when forming the folded portion 12W in the form of FIG. 13, omitting the adhesive application step 304, and maintaining the folded state in the folding step 305 while maintaining the folded state 309. In the welding process, the abdomen elastic band 12f and the back elastic band 12b are joined and the folded portion 12W is fixed simultaneously. Thereby, not only simplification of the manufacturing method but also the material cost can be reduced by the amount of the adhesive, and the advantage that the hardening of the exterior bodies 12F and 12B can be suppressed by reducing the amount of the adhesive used is brought about. . Others are the same as those shown in FIGS. 15 and 16.

  Although not shown, when the folded portion 12W is provided on the ventral side, in the folding step 305, the leg opening side portion of the ventral stretch band 12f is folded and fixed in the CD direction to form the folded portion.

  Moreover, although not shown in figure, when manufacturing the underpants type disposable diaper which has the exterior body 12 which continues from an abdominal side to a back side through the crotch, in the process 301-310 in the above-mentioned manufacturing method, at least a center slit process 303 is not provided, but instead, a punching process for forming a leg opening is provided for one large elastic band. This punching process may be provided at any stage, but is preferably between the elastic member mounting process 301 and the interior body mounting process 307.

<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 the direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means the direction orthogonal to the front-rear direction (left-right direction). “Up and down direction” means the wearing state of the diaper, that is, the direction perpendicular to the waistline direction when the diaper is folded in two at the crotch so that both the front and back sides of the diaper overlap. For example, it means a direction connecting the waist opening side and the crotch side.

“Elongation rate” means a value when the natural length is 100%.
-"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  The present invention can be used in a pants-type disposable diaper and its manufacture.

  L: Intermediate part, Le: Edge of leg opening, T ... Trunk circumference part, U ... Waist lower part, W ... Waist edge, 11 ... Liquid impervious sheet, 12A ... Side seal part, 12B ... Backside exterior body 12F, 12B ... exterior body, 12F ... ventral side exterior body, 12H ... inner sheet material, 12M ... crotch cover sheet, 12S, 12H ... sheet material, 12S ... outer sheet material, 12W ... folded portion, 12b ... back side Elastic band, 12c: CD direction middle part, 12d: Separation part, 12e ... Edge sheet material, 12f ... Ventral elastic band, 12w ... Overlapping part, 15-19 ... Elongated elastic elastic member, 16 ... Middle part elasticity Elastic member, 17 ... Waist edge elastic elastic member, 19 ... Elastic elastic elastic member, 30 ... Top sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Diagonal gather, 62 ... Gather sheet, DESCRIPTION OF SYMBOLS 00 ... Interior body, 301 ... Elastic member attachment process, 302 ... Elastic member cutting process, 303 ... Center slit process, 304 ... Adhesive application process, 305 ... Folding process, 307 ... Interior body attachment process, 308 ... Folding process, 309 ... side part joining process, 310 ... separation process.

Claims (10)

An exterior having a ventral exterior part and a back exterior part, wherein a side edge part of the abdominal exterior part and a side edge part of the back exterior part are joined on both sides in the width direction to form a waist opening. Body,
An interior body provided such that a front portion is joined to a central region in the width direction of the abdominal exterior portion and a rear portion is joined to a central region in the width direction of the back exterior portion, so as to pass through the crotch of the wearer. And comprising
In the pants-type disposable diaper in which at least part of the edge of the leg opening is formed by the edge of the portion located on both sides in the width direction of the interior body in the exterior body,
In at least one exterior part of the ventral exterior part and the back exterior part;
In the lower edge of the side edge corresponding region corresponding to the side edge and the front-rear direction, portions located on both sides in the width direction of the interior body form the edge of the leg opening,
The lower portion of the side edge corresponding region is a folded portion that is fixed by being folded once or a plurality of times in a zigzag manner at the side edge portion, and from the folded portion toward the center in the width direction. The folded portion gradually expands downward as it is fixed to the interior body in the state where it is halfway or completely expanded downward in the central portion in the width direction, and the folded portion in the interior body from the folded portion. An elongated slanted elastic elastic member fixed in an extended state along the direction toward the side edge below the part is provided,
The joining of the side edge of the ventral exterior part and the side edge of the back exterior part, and the fixing of the folded part are made integrally by welding,
A pants-type disposable diaper characterized by that.   The exterior body is formed by joining both sides of the abdominal exterior body forming the abdominal exterior part and both sides of the back side exterior body forming the back side exterior part. The pants-type disposable diaper according to claim 1, wherein the side exterior body is spaced apart from the crotch side without being continuous.   The pants-type disposable diaper according to claim 2, wherein the folded portion is formed to be folded inside the at least one exterior portion.   The pants-type disposable diaper according to claim 2, wherein the folded portion is formed to be folded outside the at least one exterior portion.   The pants type disposable diaper according to any one of claims 2 to 4, wherein the at least one exterior portion is the back exterior body.   The pants-type disposable according to any one of claims 2 to 4, wherein the folded portion is formed only on one of the exterior portions, and the folded portion extends to the outside of the other exterior portion. Diapers.   The shape of the said at least one exterior part is a underpants type disposable diaper of any one of Claims 2-6 which is a rectangle in the state which expand | deployed the said folding | turning part. Stretch band forming step for forming a belly side stretch band and a back side stretch band formed by fixing an elastic stretch member in a stretched state along the continuous direction to a sheet material continuous in a belt shape,
While the abdominal stretch band and the back stretch band are transferred in parallel in the CD direction with a gap therebetween, separately manufactured interior bodies are supplied with a gap in the MD direction, and the front part of the interior body is supplied to the abdomen. An interior body attaching step, in which a side stretchable band and a rear portion of the interior body are joined to the back stretchable band to form an interior assembly; and
Folding the interior assembly in half in the CD direction;
Joining the abdominal stretch band and the back stretch band at the parts that will be both sides of each diaper, cutting the abdominal stretch band and the dorsal stretch band at the boundary of each diaper, Obtaining a side joining and disconnecting step;
In the manufacturing method of the pants-type disposable diaper including
After the interior body attaching step and before cutting at the boundary of each individual diaper, the leg opening side portion of at least one elastic band is fixed once in the CD direction or a plurality of zigzags. And forming a folded portion, including a folding step,
A method for producing a pants-type disposable diaper, characterized in that   The pants-type disposable according to claim 8, wherein, prior to the folding step, an adhesive is applied to a portion of the at least one elastic band that fixes the folded portion, and the folded portion is fixed by the adhesive in the folding step. Diaper manufacturing method.   Prior to joining the ventral stretch band and the back stretch band in the side joining and disconnecting step, the folding step in the folding step is performed, and the folded state is maintained while maintaining the folded state. The manufacturing method of the underpants type disposable diaper of Claim 8 which joins and fixes the said folding | returning part simultaneously by welding process.