JP2010148537A - Wearing article and method of manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wearing article which is applicable to a wide range of sizes and a method of manufacturing the same. <P>SOLUTION: The wearing article 1 is provided with edge sections leg edge sections and waist edge sections formed by including sheets. Elastic members 6, 7, 8 are arranged in a stretched state on the sheets in the edge sections so as to extend along the edges. Those portions of the sheets to which the elastic members 6, 7, 8 are provided are stretch-processed in the direction of stretch and contraction of the elastic members 6, 7, 8 to form stretch-processed sections P1, P2. Elastic members 5 are provided to band-like sheets 15 which form three-dimensional gathers 18, and those portions of the band-like sheets to which the elastic members 5 are provided are stretch-processed in the direction of stretch and contraction of the elastic members to form stretch-processed sections P3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wearing article such as a disposable diaper and a sanitary napkin, and a method for producing the same.

  Disposable diapers, which are a type of worn article, are known to be unfolded disposable diapers with fastening tape and pants-type disposable diapers that have been formed into pants in advance. A waist opening into which the body is inserted and a leg opening into which the legs are inserted. These openings are usually formed by connecting the edges of a diaper in an annular shape, and the edges are usually configured to include a sheet such as a nonwoven fabric.

  Since the opening periphery of the disposable diaper's waist or leg opening may loosen or slide away from the diaper wearer's body due to the movement of the diaper wearer, etc., such inconvenience In order to prevent this, elastic elasticity is given to these opening peripheral parts. Generally, when elastic stretchability is imparted to a disposable diaper, a stretched thread-like or belt-like elastic member is fixed between two substantially non-stretchable sheets via an adhesive, and the elastic member is attached to the disposable diaper. A method of forming a gather by shrinking is common.

  Moreover, as a material used for a wearing article, for example, in Patent Document 1, two sheets and an elastic member are intermittently joined in the expansion / contraction direction of the elastic member, and one sheet in the expansion / contraction direction A composite stretchable member is described in which a joint between the other sheet and the elastic member is provided between the joint with the elastic member, and each sheet has a convex raised portion formed between the joints. . The composite stretchable member described in Patent Document 1 has a large number of ridges extending in the crossing direction of the stretchable direction of the elastic member, and as a result, a fiber dense structure is formed on the surface, thereby providing a soft and good touch. It is expressed. Patent Document 2 describes a method of obtaining a nonwoven fabric excellent in flexibility by gear-stretching a thermoplastic polymer nonwoven fabric under a condition of a predetermined stretching ratio.

  In Patent Document 3, a belt-like sheet whose stretchability is improved by stretching is stretched in the width direction by being sandwiched between a pair of tooth-gap rolls having tooth grooves engaged with each other. A method for producing disposable diapers having a stretching step that improves the process is described. Further, in Patent Document 4, a stretch-free web having zero strain is supplied between pressurizing apparatuses having three-dimensional surfaces that mesh with each other, and a part of the web is stretched by pressurization by the apparatus to be elastic. A method of manufacturing a disposable diaper having a process of converting is described. In the manufacturing method of the disposable diaper described in Patent Documents 3 and 4, an elastic member forming various gathers is fixed between two sheets stretched in advance via an adhesive, and the elastic member is attached to the sheet. The sheet is stretched before fixing.

JP 2006-27089 A JP 2003-73967 A JP 2008-61693 A Japanese Patent No. 3516679

  By the way, in the conventional disposable diaper, the edge of the diaper, including the opening edge of the waist opening and the leg opening, usually forms a gather from the viewpoint of texture, liquid leakage prevention, etc. It is formed of a sheet having substantially no extensibility such as a resin sheet. Therefore, even if the edge is pulled along its longitudinal direction, the edge hardly stretches. Because of the tightening, the wearer feels uncomfortable. If the edge is further pulled, it will break. As described above, the conventional disposable diaper whose edge portion is not substantially extensible has almost no change in its outer shape and dimensions, so that the diaper worn against the movement of the wearer hinders the movement. There are problems such as tightening and tightening, and the size application range is narrow, and it has not been able to sufficiently cope with various physical characteristics and body shapes of diaper wearers. Therefore, in order to respond to various physical characteristics and body shapes of diaper wearers, it is necessary to prepare many types of diapers (size lineup) with slightly different external shapes and dimensions, and manufacturing costs due to heavy use of materials Inconvenience such as soaring.

  Therefore, the present invention relates to providing a worn article having a wide size application range and a method for manufacturing the same.

  The present invention is a wearing article having an edge portion including a sheet, wherein an elastic member is disposed in an extended state along the edge portion on the sheet at the edge portion, and the sheet It is related with providing the wearing article by which the arrangement | positioning part of this elastic member in is extended | stretched in the expansion-contraction direction of this elastic member.

  Further, the present invention is a method for manufacturing the wearing article, wherein an elastic member is joined to an edge portion of the sheet in an extended state along the edge portion to obtain a composite sheet, and the composite sheet is expanded and contracted. In a state where the elastic member of the composite sheet is stretched in a direction, the portion having the elastic member disposed between the pair of sandwiching bodies having meshing teeth and stretching the portion. The present invention relates to providing a method for manufacturing a worn article.

  According to the present invention, it is possible to provide a wearing article that has a wide size application range, can be applied to various physical characteristics and body shapes of the wearer, and is reduced in manufacturing cost. Further, according to the present invention, when a wearing article is manufactured using a pattern paper of a predetermined size, a wearing article that can accommodate a size exceeding the range normally assumed from the size of the pattern paper is obtained. A large-sized wearing article can be provided with a small amount of material. Since the amount of materials used can be reduced, resources are less and it is environmentally friendly. In addition, the wearing article provided by the present invention has a margin that surrounds a part of the wearer's body in an annular shape and gently touches the skin, so that there is little tightening and there is a trace of the edge on the skin. It is hard to stick and is excellent in wearing feeling. Further, according to the present invention, it is possible to form a gather having ridges that are regularly arranged.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 is a plan view of a skin contact surface side (surface sheet side) schematically showing a developed state in which a disposable diaper which is an embodiment of the wearing article of the present invention is expanded in a flat shape by stretching elastic members of each part. 2 is a cross-sectional view schematically showing a cross section taken along the line II of FIG. The diaper 1 of this embodiment is a wearing article having a waist edge and a leg edge as an edge that includes a sheet. In the present specification, the “edge portion” is a region having a predetermined width along the edge including the edge (end) of the article and the vicinity thereof.

  As shown in FIGS. 1 and 2, the diaper 1 of the present embodiment includes a top sheet 2 that forms a skin contact surface, a back sheet 3 that forms a non-skin contact surface, and a space between the two sheets 2 and 3. It has a liquid-retaining absorbent body 4 arranged, and has a fastening tape 9 for fastening, and is a deployment type that is formed substantially vertically. The diaper 1 has the back side part A, the abdominal side part B, and the crotch part C located between these in the longitudinal direction. The back side part A is a part located on the wearer's back side, the abdomen part B is a part located on the wearer's belly side, and the crotch part C is a part located on the wearer's crotch. The crotch part C is located at the center in the longitudinal direction of the diaper 1. In addition, in this specification, a skin contact surface is a surface turned to a wearer's skin side at the time of wear in a wear article and its component, and a non-skin contact surface is at the time of wear in a wear article and its component. It is a surface directed to the side opposite to the wearer's skin side.

  The diaper 1 has an hourglass shape in which both side edges along the longitudinal direction of the crotch portion C are curved inwardly in an arc shape, and the central portion in the longitudinal direction is bound inward as a whole. The top sheet 2 has a substantially rectangular planar view shape having an outer dimension larger than that of the absorber 4, and is arranged in the center in the width direction of the back sheet 3. The back sheet 3 is made of non-woven fabric and has an hourglass-like outer shape that matches the outer shape of the diaper. The top sheet 2 and the back sheet 3 respectively extend outward from both longitudinal edge portions and both lateral edge portions of the absorbent body 4, and directly or other members are interposed in these extending portions. Are joined together by a joining means such as an adhesive or a seal joint. A liquid-impermeable back side inner layer sheet 31 is disposed between the back sheet 3 and the absorber 4. The back side inner layer sheet 31 has a rectangular shape with a size capable of covering the entire area of the non-skin contact surface of the absorbent body 4, and the crotch part C has substantially the same width as the back sheet 3. The back side portion A and the ventral side portion B are narrower than the back sheet 3. In the present embodiment, the length in the longitudinal direction of the back surface side inner layer sheet 31 is the same as that of the back surface sheet 3, but if the substantially entire area of the non-skin contact surface of the absorber 4 can be covered, the back surface sheet 3 may be shorter than the length in the longitudinal direction.

  The diaper 1 includes a three-dimensional gather 18 whose one side edge is fixed on one surface of the sheet forming the diaper 1 and whose other side edge can stand above the one surface with the fixed end as a rising base end. Yes. Specifically, a pair of three-dimensional gathers 18 and 18 extending in the longitudinal direction are disposed on both side portions along the longitudinal direction of the diaper 1. Each three-dimensional gather 18 includes a belt-like sheet 15 to which one side edge 15a in the width direction orthogonal to the longitudinal direction of the diaper 1 is fixed, and the other side edge (free edge) 15b in the width direction of the belt-like sheet 15. Alternatively, one or a plurality (two in this embodiment) of three-dimensional gather forming elastic members 5 fixed in an extended state in the vicinity thereof are provided. The elastic member 5 is disposed between the back side portion A and the ventral side portion B along the longitudinal direction of the diaper 1. It is preferable that at least one elastic member 5 is arranged at a position within 60 mm, particularly within 0 to 30 mm from the other side edge (free side edge) of the belt-like sheet 15. One side edge (fixed edge) 15a of the belt-like sheet 15 is joined to the surface sheet 2 along the longitudinal direction of the diaper 1 at a position outside the both side edges in the longitudinal direction of the absorbent body 4. The joint portion 16 is a rising base end portion 16 of the three-dimensional gather 18. The belt-like sheet 15 extends outward in the width direction of the diaper 1 from the rising base end portion 16, and is joined to the back sheet 3 at the extended portion. Further, the belt-like sheet 15 is joined to the top sheet 2 also at the front and rear end portions of the diaper 1 in the longitudinal direction.

  Further, leg edge portions (side edge portions along the longitudinal direction of the diaper 1 in the crotch part C (side edge portions curved inwardly in an arc shape)) in the crotch part C or the vicinity thereof 1 or a plurality of (two in this embodiment) leg elastic members 6 are arranged in a substantially straight line. The leg elastic member 6 is clamped and fixed in an expanded state between the belt-like sheet 15 and the back sheet 3 or the back side inner layer sheet 31 on the outer side in the width direction than the elastic member 5 for forming a three-dimensional gather. As a result, leg gathers are formed. The elastic member 6 is disposed between the back side portion A and the ventral side portion B along the longitudinal direction of the diaper 1. At least one elastic member 6 is arranged at a position within 100 mm from the side edges 1c, 1d in the width direction of the diaper 1 (that is, the opening peripheral edge of the leg opening in the wearing state of the diaper 1), particularly within 0 to 50 mm. Is preferred.

  In addition, a waist elastic member 7 is disposed on a waist portion D (waist edge) in the back side portion A to form a waist gather. The waist elastic member 7 is clamped and fixed in an extended state between the top sheet 2 and the back sheet 3 or the back side inner layer sheet 31 over substantially the entire width along the width direction of the diaper 1. It is preferable that at least one elastic member 7 is arranged at a position within 80 mm, particularly within 0 to 40 mm from the longitudinal edge 1a of the diaper 1 (that is, the opening periphery of the waist opening when the diaper 1 is worn). . The waist part D is a part located around the waist of the wearer, and usually the diaper from the longitudinal edge 1a of the diaper 1 on the back side A (the longitudinal edge 1b of the diaper 1 on the stomach side B). 1 is a region up to 1 to 15% of the entire length in the longitudinal direction.

  Further, a plurality of waistline gather forming elastic members 8 are disposed on both sides in the longitudinal direction of the waistline E (near the waist edge) in the back side portion A to form a pair of left and right waistline gathers. ing. The elastic members 8 for forming the waistline gathers are arranged substantially linearly along the width direction, and are sandwiched and fixed between the top sheet 2 and the back sheet 3 or the back side inner layer sheet 31 in an extended state. As shown in FIG. 1, the waistline portion E in the back side portion A has the diaper 1 in a state (expanded state) in which the elastic members of the respective portions are stretched and expanded in a flat shape, with the back side portion A side on the upper side and the abdomen. When the side portion B side is considered as the lower side, the region is located below the waist portion D and above the crotch portion C.

  A pair of fastening tapes 9 are provided on both side edges along the longitudinal direction of the back side A. More specifically, side flaps 11 and 11 extending outward in the width direction from the width direction side edge of the absorbent body 4 are formed on both side portions of the back side portion A, respectively. The fastening tape 9 is attached so as to extend outward in the width direction. A hook member (not shown) of a mechanical fastener is attached to the fastening tape 9. As this hook member, those known in the art can be used without particular limitation. Note that side flaps 11, 11 extending outward in the width direction are also formed on both sides of the ventral side B.

  A landing tape 10 for fastening the fastening tape 9 is affixed on the outer surface (non-skin contact surface) of the abdominal side B. The landing tape 10 is composed of a rectangular base material sheet and a loop material bonded to the base material sheet. The loop material is used as an engaging member that engages with the hook member attached to the fastening tape 9.

  In the diaper 1 of the present embodiment having the above-described configuration, as usual, the top sheet 2 side is applied to the wearer's body, and the hook members of the pair of fastening tapes 9, 9 located on the back side are placed on the ventral side. By fastening to the landing tape 10 that is positioned, the width direction side edges 1c and 1d of the diaper 1 and the portions (leg edges) located in the crotch C in the vicinity thereof become annular and a pair of leg openings ( (Not shown) is formed, and the longitudinal edges 1a and 1b of the diaper 1 and the vicinity thereof (waist edge) are connected to form an annular shape to form a waist opening (not shown).

  And in the diaper 1 of this embodiment, the elastic member 6 is arrange | positioned in the expansion | extension state along the leg edge part on the sheet | seat (strip | belt-shaped sheet | seat 15, the back surface side inner layer sheet | seat 31, and the back surface sheet 3) in the said leg edge part. In addition, the arrangement portion of the elastic member 6 in the sheet is stretched in the expansion / contraction direction of the elastic member 6 (longitudinal direction of the diaper 1). In addition, the elastic members 7 and 8 are disposed in the stretched state along the waist edge on the sheets at the waist edge (the front sheet 2, the back side inner layer sheet 31 and the back sheet 3). The arrangement portions of the elastic members 7 and 8 are stretched in the expansion / contraction direction of the elastic members 7 and 8 (the width direction of the diaper 1). In FIG. 1, the stretched portion (hereinafter also referred to as a stretched portion) is hatched and denoted by reference symbols P1 to P3 (reference symbol P3 will be described later). Reference symbol P1 indicates a stretched portion at the leg edge (ie, the opening peripheral portion of the leg opening), and reference symbol P2 indicates a stretched portion at the waist edge (ie, the opening peripheral portion of the waist opening). The stretched portion P1 extends from each of the opening peripheral edges 1c and 1d of the leg opening to a position beyond the leg elastic member 6 positioned inward in the diaper width direction. Further, the stretched portion P <b> 2 extends from the opening peripheral edge 1 a of the waist opening portion to a part of the elastic member 8 in the waistline portion E beyond the waist portion D in the back side portion A.

  FIG. 3 schematically shows a part of the stretched portion P <b> 1 in the unfolded diaper 1 shown in FIG. 1. As shown in FIG. 3, the stretched processed portion P <b> 1 is provided with a large number of ridge-like ridges 20 in which the belt-like sheet 15 protrudes outwardly (on the wearer's skin side). A large number of ridge-like ridges 21 are formed in which the back side inner layer sheet 31 protrudes outwardly (opposite to the wearer's skin side). A large number of ridges 20 and 21 extend in the direction (width direction of the diaper 1, the Y direction in FIG. 3) perpendicular to the expansion / contraction direction of the elastic member 6 (longitudinal direction of the diaper 1, X direction in FIG. 3). A large number of gathers 20 and 21 are formed so as to form regular rows along the leg edges. A gather as shown in FIG. 3 is also formed in the stretched portion P2 and the stretched portion P3 described later.

  The sheet in the stretched parts P1 and P2 is stretched or broken due to the stretching process, and some or all of the fibers that are components of the sheet are stretched or broken. As a result, the elastic member is easily stretched in the direction of expansion and contraction and the amount of elongation is increased as compared with a portion of the same sheet that has not been subjected to the stretching process (a portion that has not undergone plastic deformation). That is, the sheet itself in the stretched processed parts P1 and P2 is easily stretched in the expansion / contraction direction of the elastic member even at low stress. Therefore, the stretched parts P1, P2 have a large amount of elongation when pulled in the expansion / contraction direction of the elastic member, compared to the leg gathered part and the waist gathered part in the conventional diaper that has not been stretched, Moreover, it has high extensibility which is easy to extend with a small force. In addition, since the elastic members are arranged in the stretched state in the stretched parts P1 and P2, even if a sheet that easily stretches in the stretch direction of the elastic member is stretched in the stretch direction, the elastic member contracts. The sheet does not remain stretched by the action, so that a contracted gather as shown in FIG. 3 is easily formed.

  In the diaper 1 of the present embodiment, stretched parts P1 and P2 whose extensibility in the expansion / contraction direction of the elastic member is enhanced by the stretching process are provided on the leg edge and the waistline arranged around the legs of the wearer. By having it in the arranged waist edge, there are various excellent effects. That is, the diaper 1 of the present embodiment has a wider size application range than an unstretched product that has not been stretched, and can accommodate various physical characteristics and body shapes of the wearer. Moreover, since the leg edge part (stretched processed part P1) and the waist edge part (stretched processed part P2) gently contact the wearer's skin, the diaper 1 has a small amount of tightening and has a space. It is hard to get a mark on the edge and is excellent in wearing feeling. Moreover, such a feature of the diaper 1 of the present embodiment is that the original member is simply stretched without changing the size of the diaper pattern (front sheet and back sheet) or adding a new member. Therefore, although the diaper 1 has high performance, the material cost is reduced and the manufacturing cost is reduced, and it is environmentally friendly. Further, the leg edge and the waist edge of the diaper 1 have ridges extending in a direction perpendicular to the expansion / contraction direction of the elastic member as shown in FIG. 3 by the stretching process (gear stretching method) of the sheets constituting these parts. A large number of gathers are formed so as to form a row along the edge, and the appearance (appearance) of the diaper 1 is improved by the gathers having the ridges that are regularly aligned.

  Moreover, in the diaper 1 of this embodiment, the arrangement | positioning part of the elastic member 5 for three-dimensional gathers in the strip | belt-shaped sheet | seat 15 which forms the three-dimensional gather 18 [Namely, the other side edge (free edge) 15b of the three-dimensional gather 18] However, the elastic member 5 is stretched in the expansion / contraction direction (longitudinal direction of the diaper 1). In FIG. 1, symbol P <b> 3 indicates a stretched portion in the three-dimensional gather 18. The stretched portion P3 extends from the free side edge of the belt-like sheet 15 to a position beyond the elastic member 5 located most outward in the diaper width direction. Arranging the stretched portion at the free edge where the solid gather can stand up is effective in expanding the size range of the diaper and can be designed to follow the movement of the wearer. It is also effective in that it can prevent leakage and can form gathers that are regular in appearance.

The stretching process according to the present invention is applied to a part or all of the arrangement part of the elastic member in the sheet constituting the edge of the absorbent article, and is usually located in the vicinity of the arrangement part. It is also applied to a portion where no elastic member is arranged. That is, in this invention, it does not exclude performing an extending | stretching process exceeding all the arrangement | positioning parts of an elastic member. Therefore, the stretched processed parts P1 to P3 are not limited to only the arrangement part of the elastic member in the sheet constituting the edge part of the diaper 1, and may include a part where the elastic member is not arranged.
Further, when the length of the edge where the stretched portion is formed is T1, and the length along the edge of the stretched portion is T2, the ratio of T2 to T1 (T2 / T1) is preferably Is 0.1 to 10.0, more preferably 0.2 to 0.9. Here, the edge where the stretched portion is formed is an edge along which the stretched portion is along. For example, if the stretched portion P1, the leg opening edge of the stretched portion P1 is used. Means the length along the stretched portion P2, the length along the waist opening edge on the back side A of the stretched portion P2, and the stretched portion P3, It means the edge (free side edge) of the free edge portion 15b of the belt-like sheet 15 of the stretched portion P3.

  The sizes of the stretched parts P1 to P3 can be appropriately set according to the distance from the opening peripheral edge or a free side edge (hereinafter also referred to as a peripheral edge) where the solid gathers can stand up to an elastic member in the vicinity thereof. it can. The stretched parts P1 to P3 mean the total length in the direction perpendicular to the extending direction of the peripheral edge from the peripheral edge or the like (for example, the stretched parts P1 and P3 mean the total length in the width direction of the diaper 1). In the stretched processed part P2, it is preferably formed over a length of 1 to 45%, particularly 1 to 10% of the length of the diaper 1 in the longitudinal direction). The length along the width direction of the diaper 1 of the stretched part P1 is preferably 5 to 150 mm, more preferably 5 to 50 mm, and the length along the longitudinal direction of the diaper 1 of the stretched part P2 is The length of the stretched processed part P3 along the width direction of the diaper 1 is preferably 0 to 150 mm, and more preferably 0 to 50 mm.

  Further, the stretch ratio of the stretched parts P1 to P3 is the stretch ratio by the stretching process or the material of the sheet (surface sheet 2, back side inner layer sheet 31, back sheet 3, belt-like sheet 15) subjected to the stretching process, etc. Depending on the case, it is preferably 2 to 500%, more preferably 50 to 300%. In that case, the elongation ratio of the portion of the sheet that has not been stretched is 0 to 400%, and is usually smaller than the stretch ratio of the stretched portions P1 to P3. Moreover, when the sheet | seat which comprises the said gathers in the to-be-stretched process parts P1-P3 is a nonwoven fabric, a resin sheet, etc. which are mentioned later, the expansion | extension rate of this gather before extending | stretching process is 2-400% normally.

  Here, the elongation rate is measured as follows. For example, when measuring the elongation ratio of the stretched portion P1, first, the side flap of the diaper 1 including the stretched portion P1 in which the elastic member 6 is disposed in the stretched state is cut out from the diaper 1. The cut side flap is left in a relaxed state, and a unit length (50 mm, 100 mm, 200 mm, etc.) is marked on the side flap in the expansion and contraction direction of the elastic member 6 using a pen or the like. The both sides of the mark on the side flap are gripped, the side flap is pulled in the direction of expansion / contraction of the elastic member 6 and stretched, and when the extension of the side flap stops, the dimension between the marks (limit elongation length) is measured. . By dividing the limit elongation length by the length of the side flap before pulling (initial length), and further subtracting 1 and multiplying by 100, the stretch rate (%) of the stretched portion P1 is obtained. For example, when the initial length of the stretched portion P1 is 50 mm and the limit elongation length is 75 mm, the stretch rate of the stretched portion P1 is 50%.

  In particular, the stretch rate of the stretched portion P1 located at the opening peripheral edge (leg edge) of the leg opening is preferably 50 to 500%, more preferably 100 to 300%, and the opening peripheral edge of the waist opening. The stretched portion of the stretched portion P2 located at the portion (waist edge) is preferably 10 to 150%, more preferably 10 to 100%, and the stretched portion located at the free edge 15b of the belt-like sheet. The elongation percentage of P3 is preferably 50 to 500%, more preferably 100 to 300%.

  The stretched processed parts P1 to P3 are bonded to the edge of the sheet or the vicinity thereof in a stretched state, and the sheet and the elastic member are integrated. It can be obtained by subjecting the elastic member to stretching. During this stretching process, the elastic member is in an expanded state. For example, as will be described later, a stretching process of a sheet such as a nonwoven fabric or a resin sheet can be performed by a gear stretching method in which a pair of gears having gear teeth meshing with each other is used and the sheet is meshed with the gears. The shape of the gear may be a pair of gear rolls (wave rolls) in which the tooth gaps are engaged in a gear shape, or may be a flat plate shape or an inclined tooth shape. The drawing process can be performed using, for example, the gear described in Patent Document 1 described above (see the description of FIGS. 3 and 5 of Patent Document 1).

  The material for forming each part in the diaper 1 will be described. The top sheet 2, the back side inner layer sheet 31, the back sheet 3 and the belt-like sheet 15 are all subjected to stretching, and are made of sheets suitable for stretching. Those are preferred. The sheet suitable for the stretching process is a sheet that can be sufficiently stretched by being subjected to the stretching process, but can ensure the strength of the sheet itself. As such a sheet, 1) a sheet that does not have stretchability before stretching (that is, non-stretchable), and that exhibits stretchability or stretchability by stretching, or 2) somewhat before stretching A sheet having a high elongation (low extensibility) and having an extensibility or stretchability improved by a stretching process (having high extensibility) is preferably used, and includes, for example, a nonwoven fabric, a resin sheet, an elastomer material, and an elastomer. Examples thereof include sheet composite materials.

  In particular, the top sheet 2, the back sheet 3, and the belt-like sheet 15 are preferably non-woven fabrics from the viewpoints of air permeability and extensibility. As the surface sheet 2, a liquid-permeable nonwoven fabric that allows liquid such as urine to pass therethrough is preferably used, and an opening is formed as necessary. As the back sheet 3 and the belt-like sheet 15, a liquid-impermeable and moisture-permeable nonwoven fabric or a water-repellent and moisture-permeable nonwoven fabric is particularly preferably used. Moreover, as the back side inner layer sheet 31, a liquid-impermeable resin sheet is preferable.

Examples of the nonwoven fabric include a spunbond nonwoven fabric made of an elastic fiber or an inelastic fiber, a meltblown nonwoven fabric, an SMS nonwoven fabric combining a spunbond and a meltblown, an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, an airlaid nonwoven fabric, and a resin bond. The thing by various manufacturing methods, such as a nonwoven fabric, is mentioned. The basis weight of these nonwoven fabrics requires a certain amount of basis weight and strength to prevent tearing. Conversely, if the basis weight is too high and too thick, 5 to 50 g / m ² , especially 8 to 8%. 30 g / m ² is preferred.

  Examples of the material of the fibers constituting the nonwoven fabric include synthetic resins such as polyethylene, polypropylene, polyester, and acrylic. The fiber constituting the nonwoven fabric may be subjected to a hydrophilic treatment or a water repellent treatment, or may be a so-called core-sheath composite fiber having a heat-fusible sheath material on the surface of the core material. In a nonwoven fabric, it is preferable to use the fiber which is easy to express extensibility by a drawing process.

Examples of the resin sheet include films made of polyethylene, polypropylene, polyester, polyurethane and the like. The resin sheet may be foamed. The thickness of the resin sheet is preferably 5 to 100 μm, particularly 8 to 30 μm, from the viewpoints of softness and strength. From the same viewpoint, the basis weight of the resin sheet is preferably 5 to 50 g / m ² , particularly preferably 8 to 30 g / m ² .

  Further, as the absorbent body 4, those used as absorbent bodies in conventional disposable diapers can be used without particular limitation. For example, a fiber assembly made of hydrophilic fibers such as wood pulp, and the fiber assembly is granular. The thing etc. which hold | maintained superabsorbent resin can be used. These fiber aggregates may be covered with a water-permeable sheet such as paper or nonwoven fabric.

  Further, as the various elastic members 5, 6, 7, and 8, a known material conventionally used for this type of diaper can be used without particular limitation. Examples of the material of the elastic member include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butylene-styrene), and SEPS ( Styrene-ethylene-propylene-styrene), stretchable polyolefin, polyurethane and the like. Further, the form of the various elastic members 5, 6, 7, and 8 can be appropriately selected from a thread form, a band form, a ribbon form, a film form, a net form, and the like. From the viewpoint of excellent stress design and ease of stress design, a thread-like or ribbon-like elastic member is preferable.

  Examples of the adhesive used for joining the various sheets 2, 31, 3, 15 and the various elastic members 5, 6, 7, 8 include, for example, styrene (SIS, SBS, SEBS), and polyolefin. A hot melt adhesive is mentioned.

  Next, the manufacturing method of the wearing article of this invention is demonstrated with reference to drawings, taking the manufacturing method of the disposable diaper 1 mentioned above as an example. In the description of the manufacturing method of the present invention, which will be described later, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. The description of the embodiment described above is appropriately applied to components that are not particularly described.

  As shown in FIG. 4, the manufacturing method of this embodiment is arranged at the edge of a laminated sheet formed by laminating three sheets (a top sheet 2, a back side inner layer sheet 31, and a back sheet 3). The elastic members 6, 7, and 8 are joined together in an extended state to obtain a continuous body of the diaper intermediate 30 (composite sheet), and the diaper intermediate 30 is extended in the expansion and contraction direction of the elastic members 6, 7, and 8. In this state, the portion of the diaper intermediate 30 where the elastic members 6, 7, and 8 are arranged is bitten between a pair of tooth groove rolls (clamping bodies) 40 and 41 having tooth grooves that mesh with each other, It has the process of extending | stretching this part. In the present embodiment, in addition to the pair of tooth groove rolls 40 and 41, another pair of tooth groove rolls 50 and 51 are used as a sandwiching body for performing the stretching process.

  The diaper intermediate 30 joins the elastic member 6 in a stretched state to the leg opening peripheral part (leg edge part) between the top sheet 2 and the back side inner layer sheet 31 or the back sheet 3, and the waist on the back side part A side. The elastic members 7 and 8 are joined to the part D and the waistline E (waist edge) in an expanded state. The diaper intermediate 30 can be manufactured according to a conventional method in the same manner as this type of diaper manufacturing method. As shown in FIG. 4, the continuous body of the diaper intermediate body 30 is formed such that a plurality of diaper intermediate bodies 30 are arranged in a row in the longitudinal direction. In addition, when joining an elastic member between the sheet | seats 2,31,3, there also exists a method of joining using the adhesive agent apply | coated to the sheet | seat side, but apply | coat an adhesive agent to an elastic member beforehand, and sheet | seat 2, The method of adhering to 31 is preferable from the standpoint that the flexibility of the sheet is not impaired, and that the position of application of the adhesive and the alignment of the elastic member becomes unnecessary at the time of manufacture. There is also a method of applying an adhesive to both the sheet and the elastic member for the purpose of improving the adhesiveness of the elastic member.

  The pair of tooth groove rolls 40 and 41 has tooth grooves extending in the roll axial direction (CD) and meshing with each other on their peripheral surface portions. More specifically, as shown in FIG. 4, on the peripheral surface portions of the pair of tooth groove rolls 40 and 41, high extension portions 42 in which the tooth grooves are formed are spaced apart in the roll axis direction. A pair is formed, and the tooth gap is not formed between the pair of high extension parts 42 and 42 (the center part of each roll in the roll axis direction), and a substantially flat low or non-extension part 43 is formed. ing. A pair of high extending portions 42 and 42 in both rolls 40 and 41 are formed to periodically mesh with the rotation of the rolls. Between the pair of high stretch portions 42, 42, the work to be stretched (diaper intermediate 30) is stretched on the MD.

  As shown in FIG. 5, teeth 42 a having a predetermined height H are formed in the high extension portion 42, and the high extension portions 42 of the pair of tooth gap rolls 40 and 41 are engaged with each other. Further, the tooth gaps of both rolls are engaged with each other at a predetermined engagement depth D. Therefore, the sheet of the portion of the workpiece to be stretched (diaper intermediate 30) that is bitten between the opposed highly stretched portions 42, 42 extends to some or all of the fibers that are the components of the sheet. It breaks to the extent that it does not break as a whole, causes plastic deformation, and becomes a high elongation region that exhibits excellent extensibility in the conveying direction (MD) of the stretched workpiece.

  As shown in FIG. 4, the teeth 42a extending in the roll axis direction (CD) have a trapezoidal shape whose width becomes narrower from the root to the tip when viewed from the direction (MD) perpendicular to the roll axis direction. The side edge 42as closer to the center in the roll axis direction is inclined. The tapered shape of the teeth 42a is a shape that gives the blade 42a the necessary strength and is a shape that is necessary to obtain a high draw ratio. The end face of the tooth 42a has a smooth surface shape so as not to cause local damage to the sheet material or the elastic member as much as possible during the stretching process. Since the teeth 42a have such a shape, local damage to the stretched workpiece can be reduced when the stretched workpiece is bitten. Moreover, damage to the material can be further reduced by subjecting the workpiece to stretching by gradation. Gradation means that the draw ratio is gradually changed by making the shape of the blade tapered as described above in order to smooth the boundary between the part to be stretched and the part not to be stretched. In other words, the change in the draw ratio between the stretched portion where the draw ratio exceeds 1 and the portion where the draw process has not been performed (the portion where the draw ratio is 1 time) is reduced.

  On the other hand, in the low or non-stretched portion 43 of each of the pair of tooth groove rolls 40 and 41, the tooth groove is not formed as described above and is substantially flat. Therefore, in the workpiece to be stretched (diaper intermediate 30) The portion of the sheet that passes between the opposed low or non-stretched portions 43, 43 becomes a low or non-stretchable region that does not substantially undergo plastic deformation and does not substantially exhibit extensibility. In actual product processing, when the product web is transported, the portion not subjected to stretching processing bears transport tension, and processing with constant tension becomes possible. As a result, processing can be performed with no phase shift.

  The meshing depth D (see FIG. 5) between the high-stretched portions 42 of each of the pair of tooth gap rolls 40 and 41 increases the stretch ratio of the stretched workpiece and gives the stretchable workpiece good stretchability. Further, although it depends on the material of the stretched workpiece, it is preferably 0.5 mm or more, particularly preferably 0.5 to 5 mm. As shown in FIG. 5, the engagement depth D of the pair of tooth gap rolls 40 and 41 is a length in which adjacent teeth 42a and 42a overlap when the tooth groove rolls 40 and 41 are engaged with each other and rotated.

  In the present embodiment, from the viewpoint of surely achieving the effects of the stretched parts P1 to P3 (parts subjected to the stretching process) described above, the stretched workpiece (diaper intermediate 30) is applied. The draw ratio by the drawing process is preferably 1.02 times or more, more preferably 1.1 times or more. That is, the stretch ratio (elongation ratio) of the sheet and the elastic member in the portion where the high stretch portions 42 and 42 are engaged with each other is preferably 1.02 times or more, particularly 1.1 times or more. However, if the draw ratio is too large, damage to the sheet due to the drawing process becomes too large, which may lead to insufficient strength of the sheet, and the upper limit of the draw ratio depends on the material used for the sheet. It is preferably about 0 times. Here, the stretching ratio indicates how many times the original sheet is stretched on the setting of a stretching processing apparatus such as a roll having a tooth gap, and (by meshing of a roll having a tooth gap) It is defined by (material length when the material is stretched) / (material length before being stretched by meshing of the roll). The draw ratio can be adjusted by the meshing depth of teeth, the pitch of adjacent teeth, the width of teeth, and the like in a drawing apparatus having a tooth gap.

  Moreover, as for the high extending | stretching part 42 of the tooth gap rolls 40 and 41, the pitch P (refer FIG. 5) of an adjacent tooth | gear becomes like this. Preferably it is 0.5-20 mm, More preferably, it is 0.5-10 mm. The width of each tooth 42a [length in the stretching direction (MD)] W (see FIG. 5, maximum width) is preferably less than 1/2 of the pitch P, and the height H of the tooth 42a (see FIG. 5) is preferably 0.5 to 20 mm, more preferably 0.5 to 10 mm. If the shape of the tooth groove in each of the tooth groove rolls 40 and 41 satisfies such a condition, the stretched workpiece (diaper intermediate 30) supplied between the tooth groove rolls 40 and 41 has a high elongation. Sex can be imparted.

  The tooth pitch refers to the distance between the center line of one tooth and the center line of an adjacent tooth. The tooth width of the tooth gap roll refers to the width of one tooth. The width W of the tooth 42a may be uniform over the height direction of the tooth, may be a trapezoidal shape that narrows from the root of the tooth toward the tip, or may be a rectangular shape, a triangular shape, or the like. May be. The height of the teeth of the roll refers to the length from the root to the tip of the teeth.

  In addition to the teeth 42a, a general gear defined in JIS B1701 is attached to each roll shaft of the tooth gap rolls 40 and 41 as a driving gear. Then, when the driving gear is engaged and rotated, both the rolls 40 and 41 are rotated synchronously even if the teeth 42a of the both rolls 40 and 41 are not in direct contact with each other.

  The pair of tooth groove rolls 50 and 51 have tooth grooves extending in a direction (MD) perpendicular to the roll axis direction and meshing with each other on the peripheral surface portions. More specifically, as shown in FIG. 4, on the peripheral surface portions of the pair of tooth space rolls 50, 51, a highly elongated portion 52 in which the tooth spaces are formed is separated from each other in the roll circumferential direction. The tooth gap is not formed between the pair of high extension parts 52 and 52 in each roll, and a substantially flat low or non-extension part 53 is formed. Highly extending portions 52 in both rolls 50 and 51 are formed to periodically mesh with the rotation of the rolls. Between the pair of high-stretched portions 52 and 52 in the tooth gap rolls 50 and 51, the stretched product (diaper intermediate 30) is subjected to stretching processing on the CD, and therefore the strength reduction of MD due to the stretching processing is not large. . Therefore, although the to-be-stretched workpiece is stretched over most of the width direction between the tooth gap rolls 50 and 51, it can sufficiently carry the transport tension.

  In the high extension portion 52, teeth 52a having a predetermined height are formed. The high extension part 52 is formed in substantially the same manner as the high extension part 42 of the tooth gap rolls 40 and 41 except that the tooth groove extends in a direction (MD) perpendicular to the roll axis direction. In the high extension portion 52, the tooth shape is subjected to gradation (taper) processing at the beginning of meshing of the tooth gap and at the meshing end portion. The gradation is as described above. The high stretched portion 52 can be formed as described in paragraph [0044] of FIG.

  In the workpiece to be stretched (diaper intermediate 30), the portion of the sheet between the highly stretched portions 52 and 52 facing each other stretches or breaks in part or all of the fibers and the like that form the sheet. It is broken to such an extent that it cannot be torn as a whole and causes plastic deformation, resulting in a high elongation region that exhibits excellent extensibility in the direction (CD) perpendicular to the conveying direction of the stretched workpiece. On the other hand, in the workpiece to be stretched (diaper intermediate 30), the portion of the sheet that passes between the low or non-stretched portions 53, 53 facing each other does not substantially undergo plastic deformation and exhibits substantially stretchability. It becomes a low or non-extendable region.

  The gap between the tooth gap rolls 40 and 41 and the gap between the tooth gap rolls 50 and 51 through which the work to be drawn passes can be set appropriately and accurately, and the gap to be drawn can be controlled by controlling the gap. The draw ratio of the object can be easily changed. One of the pair of tooth gap rolls is provided with an elevating function (not shown) using a cylinder or the like, so that the clearance can be easily controlled. Although not shown in the figure for fine adjustment of the gap, a wedge or the like can be used. In the illustrated example, the tooth gap roll is configured by integrating the tooth gap portion and the roll, but it may be configured by segmenting only the tooth gap portion. The segmentation of the tooth gap portion is a structure in which only the tooth groove portion can be detachably attached to the peripheral surface portion of the roll as a separate member. If the tooth gap portion is segmented, it becomes easy to adjust the meshing depth of the tooth gap, change the draw ratio, change the drawing pattern, and the like. Moreover, even if the blade is worn out, it can be easily replaced by preparing spare parts, so that the downtime can be shortened and the equipment cost can be reduced. As yet another configuration, a sleeve structure may be employed. Even with the sleeve structure, the equipment cost can be reduced as well.

  The stretching process of the diaper intermediate 30 can be performed as follows, for example. First, the continuous body of the diaper intermediate body 30 is supplied between a pair of tooth space rolls 40 and 41. Supply between the continuous rolls 40 and 41 of the diaper intermediate 30 is arranged on the downstream side with a supply nip roll (not shown) arranged on the upstream side of the MD with the both rolls 40 and 41 in between. This is performed while applying a constant tension to the continuum using a low speed nip roll (not shown). Between both rolls 40 and 41, a pair of left and right leg opening peripheral portions (in the diaper intermediate body 30 along the MD of the diaper intermediate body 30) ) Is stretched in the direction of expansion and contraction of the elastic member 6 by the conveying tension, and is stretched or broken in the sheet forming component in the meshed portion. By being appropriately broken, the sheet undergoes plastic deformation, whereby the stretched portion P1 that exhibits excellent extensibility in the direction of expansion and contraction of the elastic member 6 is obtained. On the other hand, the other part of the diaper intermediate 30 is not substantially improved in extensibility because the sheet is not substantially plastically deformed at the part.

  In this embodiment, as described above, the composite sheet (diaper intermediate 30) is stretched in the stretched direction of the elastic member, and the portion where the elastic member is disposed is stretched. Here, “the state in which the composite sheet is stretched in the expansion / contraction direction of the elastic member” means that the elastic member in the composite sheet (the elastic member of the portion subjected to the stretching process) is pulled by a conveyance tension or the like. A sheet constituting the composite sheet, meaning a state in which the elastic member is stretched at substantially the same stretch rate as that of the elastic member to the sheet constituting the composite sheet (hereinafter also referred to as the stretch rate during joining). It does not matter whether or not is stretched. Here, the elongation rate substantially the same as the bonding elongation rate includes from a slightly smaller elongation rate to a slightly larger elongation rate than the bonding elongation rate. It is preferably in the range of 5 to 1.5 times.

  Next, the continuous body of the diaper intermediate body 30 is supplied between the pair of tooth gap rolls 50 and 51 using a nip roll (not shown) in the same manner as described above. Between both the rolls 50 and 51, the center part (diaper of a part of CD of the waist part D of the back side A and the waist part E in which the elastic members 7 and 8 are joined in the extended state in the diaper intermediate body 30. The central portion of the CD at the MD front end portion of the intermediate body 30 is bitten between the high stretched portions 52 and 52 while being stretched in the direction of expansion and contraction of the elastic members 7 and 8, and the sheet at the bitten portion Elongation and breakage occur in the formation component of the sheet, and the sheet is appropriately broken to cause plastic deformation of the sheet, thereby forming the stretched portion P2 that exhibits excellent extensibility in the stretch direction of the elastic members 7 and 8. . On the other hand, the other part of the diaper intermediate 30 is not substantially improved in extensibility because the sheet is not substantially plastically deformed at the part.

  Thus, after forming the stretched parts P1 and P2 in the diaper intermediate 30 continuum, the continuum is cut into units of the diaper intermediate, and then stretched separately to form the stretched part P3. The above-described disposable diaper 1 is obtained by attaching the formed belt-like sheet 15 to the diaper intermediate 30 according to a conventional method and further attaching members such as the fastening tape 9 and the landing tape 10. Formation of the stretched portion P3 in the belt-like sheet 15 can be performed according to the method for forming the stretched portions P1 and P2 described above.

  In the manufacturing method of the present embodiment, as described above, after joining the elastic member to the sheet in an expanded state, the elastic member is stretched while being stretched on the joining portion of the elastic member in the sheet, Thereby, the size application range of a diaper is expanded, a feeling of wear is improved, and also the stretched processed parts P1 to P3 that are beautiful to the eye are obtained. On the other hand, after the sheet is stretched, the elastic member is bonded to the stretched part in an elongated state. The stretchability of the stretched part in the sheet obtained by the stretching process is There is a possibility of being damaged by the adhesive used in the joining process of the elastic member. Further, when the sheet is stretched, the sheet is stretched out and does not return to its original length by itself, so that it is difficult to join the elastic members thereafter.

  The scope of application of the present invention is not limited to the above-described unfolded disposable diapers. For example, absorbent articles such as pants-type disposable diapers and sanitary napkins, as well as absorbent articles that do not include an absorbent body. For example, it is also suitable for medical wear articles such as surgical clothes and general wear articles such as jumpers.

  For example, when the present invention is applied to a sanitary napkin, the configuration is such that a sheet-like elastic member in the form of a thread, a band, or a film is stretched along the edges on the left and right side edges of the napkin. A configuration in which the elastic member is disposed in the sheet and is stretched in the expansion / contraction direction of the elastic member is exemplified. In such a configuration, one or a plurality of the elastic members are usually arranged at the longitudinal central portion of the longitudinal side edge of the napkin, similarly to the elastic member 6 in the disposable diaper shown in FIG. The basic configuration of the napkin is the same as that of the disposable diaper described above, and is a top sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and a liquid-retaining absorbent disposed between both sheets. It has. Further, the napkin may include a three-dimensional gather that has been subjected to stretching, such as the three-dimensional gather 18 described above.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the said embodiment, although the extending | stretching process was performed with respect to the continuous body of a diaper intermediate body, you may extend | stretch with respect to one diaper intermediate body manufactured previously. Moreover, in the said embodiment, although the extending process was performed to the diaper intermediate body 30 which finished the leg turn cut (so-called R cut), you may perform an extending process before carrying out R cut. Moreover, after attaching a three-dimensional gather which has already been subjected to a stretching process or a three-dimensional gather which has not yet been subjected to a stretching process to the diaper intermediate 30, a predetermined part may be stretched. Furthermore, in the said embodiment, although the extending process was divided and implemented in two steps, extending | stretching process can also be given to both a leg edge part (leg advance) and a waist edge part (waistline) by one process. The method of stretching a desired part in a single process makes it easy to adjust the processing phase of the leg rack and the waist, and can reduce the equipment space and equipment investment. As in the above-described embodiment, the method of dividing the stretching step into multiple stages depending on the site to be stretched makes it easy to adjust the stretching ratio.

Moreover, in the said embodiment, although a pair of substantially cylindrical tooth groove roll was used as a pair of clamping body (stretching apparatus) which has a tooth groove which mutually meshes | engages, an extending | stretching apparatus is not limited to this, Various things Can be used. For example, A) a pair of conveyor belts (or caterpillars), each of which is a stretch processing apparatus in which convex portions extending in one direction of either MD or CD are continuously formed; A plurality of ridges extending in one direction of MD or CD are formed on the opposing surfaces of the pair of concavo-convex plates, and the distance between both concavo-convex plates can be increased or decreased. In this way, there is a stretching device (also called a stamper or the like) that stretches the workpiece to be stretched by displacing from a separated state to a meshed state using the cam mechanism. Moreover, the extending | stretching processing apparatus as described in Unexamined-Japanese-Patent No. 2007-22066 based on an earlier application of this applicant can also be used.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[Example 1]
A diaper (M size, total length in the longitudinal direction of 440 mm) having the same basic configuration as the unfolded disposable diaper shown in FIGS. 1 and 2 is manufactured by a manufacturing method substantially similar to the above-described embodiment. A sample of Example 1 was obtained. In the diaper of Example 1, the drawing process is performed on the leg elastic member arrangement portion in the leg edge portion and in the vicinity thereof, and is not applied to the waist edge portion or the three-dimensional gather. Accordingly, the stretched portion indicated by reference numeral P1 in FIG. 1 is formed in the diaper of Example 1, but the stretched portion indicated by symbols P2 and P3 is not formed. The stretched portion in the diaper of Example 1 extends from each of the opening peripheral edges of the pair of left and right leg openings to a position beyond the leg elastic member located inward in the diaper width direction, along the longitudinal direction of the diaper. The length was 200 mm, and the length along the diaper width direction was 25 mm. Two leg elastic members were arranged for each of the pair of left and right leg edges, and the interval between adjacent leg elastic members was 6 mm. As a diaper constituting member such as various elastic members such as a leg elastic member and various sheets such as a surface sheet, a commercially available disposable diaper “Merry's Airy Mesh” (trade name) manufactured by Kao Corporation was used.

  Moreover, in manufacture of the diaper of Example 1, processes other than an extending | stretching process followed the conventional method. Stretching is performed in a state where the leg elastic member is stretched until the total length in the longitudinal direction of the diaper is 440 mm (the leg elastic member is stretched at an elongation rate substantially equal to the elongation rate at the time of joining). The draw ratio was 1.4. As the stretching apparatus, the stamper of B) was used instead of the tooth groove roll as shown in FIG. Various conditions in the drawing process are as follows. The meshing depth of the tooth gap in the stretching apparatus (depth corresponding to the symbol D in FIG. 5); 1 mm, the pitch of the adjacent teeth (distance corresponding to the symbol P in FIG. 5); 2 mm, the tooth width (FIG. 5) The length in the stretching direction corresponding to the symbol W); 0.5 to 0.7 mm.

[Example 2]
An unfolded disposable diaper was produced in the same manner as in Example 1 except that the draw ratio by the drawing process was changed to 2.2, and this was used as the sample of Example 2. In order to make the draw ratio 2.2 times, the mesh depth of the tooth gap was changed to 2 mm.

[Comparative Example 1]
An unfolded disposable diaper was produced in the same manner as in Example 1 except that no stretching process was performed, and this was used as a sample of Comparative Example 1.

  The elongation characteristics of leg edges (portions corresponding to stretched parts in the examples) in the samples of Examples and Comparative Examples (deployable disposable diapers) were evaluated by the following method. With the diaper deployed as shown in FIG. 1 and extended to the product length (440 mm), a leg edge (length 200 mm, width 25 mm at the center in the longitudinal direction at one side edge of the diaper) is cut out from the diaper. The sample is placed between the chucks of the tensile tester [Orientec Co., Ltd., Tensilon] (distance between chucks: 180 mm) so that the longitudinal direction (stretching direction of the elastic member) is the tensile direction. After fixing and extending the distance between chucks until the tensile load reaches 120 cN (pull path), the distance between the chucks is reduced so that the tensile load becomes 0 cN (return path). Was measured, and a graph of a stress-elongation magnification curve shown in FIG. 6 was prepared. In the graph of FIG. 6, the vertical axis is stress (cN), the horizontal axis is the sample expansion ratio (times) with the reference length 200 mm being 1 time, and the horizontal axis is the actual sample length (mm). is there.

  Referring to FIG. 6, Examples 1 and 2 subjected to the stretching process have a smaller slope of the stress-elongation ratio curve than Comparative Example 1 where the stretching process was not performed. The smaller the slope of the stress-elongation ratio curve, the easier it is for the leg edge to stretch with a small force. In addition, although the rising position of the stress in Examples 1 and 2 (elongation ratio when the stress exceeds 0) is shifted to the right side of the graph as compared with Comparative Example 1, the rising position of the stress is the stretch of the elastic member. It can be designed freely by adjusting the magnification and the size of the elastic member. Further, when the elongation at the time of stress 120 cN is compared, the leg edge in Example 1 (stretching ratio 1.4 times) is about 20 mm longer than the leg edge in Comparative Example 1, and Example 2 (stretching ratio 2). .2) is about 110 mm long. From the above, it can be seen that the leg edges of Examples 1 and 2 have a high extensibility when the elastic member is stretched in the expansion and contraction direction, and are easily stretched with a small force.

  Further, the return path of the stress-elongation ratio curve in FIG. 6 is an index of how the leg edge touches the wearer's skin at the time of wearing, and the same sample length (lower part of the horizontal axis in FIG. 6). When the stress is compared, the smaller the stress, the softer the leg edge wears against the skin, the less tightening, and the less likely the edge mark is on the skin. Comparing the example and the comparative example with respect to this return path, when the sample length is 150 mm, the stress of Comparative Example 1 where the drawing process is not performed is about 35 cN, whereas the draw ratio of 1. 4 times the stress of Example 1 is about 28 cN, the stress of Example 2 with a draw ratio of 2.2 times is about 14 cN, the stress is reduced by applying the stretching process, and the edge is gentle to the skin and excellent in wearing feeling. It can be seen that fabrication of

  A wearing test was performed on the diaper of Example 2 and the diaper of Comparative Example 1. In the wearing test, a diaper is worn on an infant (5 months old), and the wearing state is observed by one panelist for sensory evaluation. As a result, Example 2 was advantageous over Comparative Example 1 in that there was room for the undercarriage; the tummy tape marks could be made smaller by one scale than Comparative Example 1; We were able to get an opinion that fine regular cocoons are beautiful in appearance.

FIG. 1 is a plan view of a skin contact surface side (surface sheet side) schematically showing a developed state in which a disposable diaper which is an embodiment of the wearing article of the present invention is expanded in a flat shape by stretching elastic members of each part. FIG. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a perspective view schematically showing a part of the leg edge (stretched portion P1) that has been stretched in the deployed disposable diaper shown in FIG. FIG. 4 is a schematic diagram showing a stretching process at the time of manufacturing the disposable diaper shown in FIG. 1. FIG. 5 is a schematic diagram showing how the composite sheet (diaper intermediate) is stretched by the tooth gap roll in the stretching step shown in FIG. FIG. 6 is a graph of a stress-elongation ratio curve at the leg edge in the diaper of the example of the present invention and the comparative example.

Explanation of symbols

1 disposable diapers (wearing articles)
2 Top sheet 3 Back sheet 31 Back side inner layer sheet 4 Absorber 5 Three-dimensional gathering elastic member 6 Leg elastic member 7 Waist elastic member 8 Girth gathering elastic member 15 Strip sheet (three-dimensional gathering sheet)
18 Three-dimensional gather 20, 21 襞 30 Diaper intermediate body 40, 41, 50, 51 Tooth gap roll 42, 52 High extension part 42a, 52a Tooth 43, 53 Low or non-extension part A Dorsal part B Abdominal part C Inseam D waist part E waistline part P1, P2, P3 stretched part

Claims (5)

A wearing article having an edge configured to include a sheet,
The elastic member is arranged in an extended state along the edge portion on the sheet at the edge portion, and the arrangement portion of the elastic member in the sheet is stretched in the expansion / contraction direction of the elastic member Goods.   The wearing article according to claim 1, comprising a waist edge portion arranged around the wearer's waist and a leg edge portion arranged around the legs as the edge portion. The one-side edge side is fixed on one surface of the sheet forming the wearing article, and the other-side edge side can be raised above the one surface with the fixed end as a rising base end, and the three-dimensional gather A belt-like sheet, and an elastic member arranged in an extended state on the other side edge of the belt-like sheet or in the vicinity thereof,
The wearing article according to claim 2, wherein an arrangement portion of the elastic member in the belt-like sheet is stretched in a stretching direction of the elastic member. It is a manufacturing method of the wearing article according to claim 1,
An elastic member is joined to the edge of the sheet in a stretched state along the edge to obtain a composite sheet, and the elastic member in the composite sheet is stretched in the expansion and contraction direction of the elastic member. The manufacturing method of the wearing article which has the process which makes the part by which it arrange | positions interpose between a pair of clamping body which has a tooth space which mutually meshes | engages, and performs an extending | stretching process to this part.   The method for manufacturing a worn article according to claim 4, wherein a stretching ratio by the stretching process is 1.02 or more.

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