WO2022190620A1 - Article vestimentaire jetable de type culotte et son procédé de production - Google Patents

Article vestimentaire jetable de type culotte et son procédé de production Download PDF

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Publication number
WO2022190620A1
WO2022190620A1 PCT/JP2022/001054 JP2022001054W WO2022190620A1 WO 2022190620 A1 WO2022190620 A1 WO 2022190620A1 JP 2022001054 W JP2022001054 W JP 2022001054W WO 2022190620 A1 WO2022190620 A1 WO 2022190620A1
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Prior art keywords
region
joint
sheet layer
sheet
width direction
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PCT/JP2022/001054
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English (en)
Japanese (ja)
Inventor
亜梨加 角田
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大王製紙株式会社
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Publication of WO2022190620A1 publication Critical patent/WO2022190620A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers

Definitions

  • the present invention relates to a pants-type disposable wearing article having an elastic structure in which an elastic sheet such as an elastic film is sandwiched between a first sheet layer and a second sheet layer, and a method for manufacturing the same.
  • a pants-type disposable diaper includes an outer body that constitutes at least a front waist portion and a back waist portion, and an inner body that includes an absorbent attached to the inner surface of the outer body so as to extend from the front body to the back body.
  • a waist opening and a pair of left and right leg openings are formed by welding both side edges of the outer body of the front body and both side edges of the outer body of the back body to form side seal portions.
  • the outer body of the pants-type disposable diaper is provided with an elastic member to add stretchability to the waist region or the like defined as the front-back direction range (the front-back direction range from the waist opening to the upper ends of the leg openings) having the side seal portions.
  • an elastic member Conventionly, a method of arranging and fixing a large number of elongated elastic elastic members such as rubber threads in a state of being stretched in the longitudinal direction has been widely adopted. There has also been proposed a method of attaching the film while it is stretched in the direction of imparting elasticity. (See Patent Documents 1 to 8, for example).
  • the elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are laminated while the elastic film is stretched in the stretching direction.
  • the layers are bonded through bonding holes formed in the elastic film at a number of dot-like first bonding portions arranged at intervals in the stretching direction and the direction orthogonal thereto.
  • the elastic sheet shrinks between the first joints, the space between the first joints becomes narrower, and the space between the first joints in the first sheet layer and the second sheet layer becomes narrower. Folds extending in a direction intersecting the stretching direction are formed in the fabric.
  • the stretchable structure with this elastic sheet is excellent in surface fit, and there is no bonding between the first sheet layer and the second sheet layer and the elastic sheet, and the bonding between the first sheet layer and the second sheet layer is also possible. Since there are very few, it is very flexible, and there is an advantage that the joint hole of an elastic sheet also contributes to air permeability improvement.
  • the side seal portion is required not only to have a peeling strength to prevent tearing during installation, but also to be easily peeled off after use.
  • the elastic film melts when the elastic film is sandwiched between the first sheet layer and the second sheet layer and the sides are sealed. - Since the first sheet layer and the second sheet layer are strongly adhered by solidification, there is a problem that the side seal portion is difficult to tear. In addition, if the side seal portions become difficult to peel off, either the front body or the back body tends to tear laterally toward the center in the width direction when the side seal portions are peeled off (hereinafter referred to as lateral tearing). There was also a point.
  • the outer body includes a non-stretchable side region located at the end adjacent to the side seal portion and a stretchable region adjacent to the side opposite to the side seal portion of the non-stretchable side region. While having a first sheet layer and a second sheet layer extending from the stretchable region to the side seal portion, the elastic sheet accompanies the first sheet layer and the second sheet layer in the side non-stretchable region. The elastic sheet and its molten material are not contained in at least the side seal portions other than the side edge portions. As a result, the elastic sheet does not melt and solidify in the side seal portion to increase the adhesive force, so the side seal portion tends to peel off.
  • the first sheet layer and the second sheet layer are fused and joined along the front-rear direction at a position separated from the side seal portion by a distance of 20 mm or less.
  • a tear limit is formed.
  • the side seal is torn at the time of disposal, and when the front body and the back body are separated from each other, it is prevented from being torn in the lateral direction, and the side seal part is torn in the front-rear direction along the side seal part. It is said that it will be possible to tear it apart.
  • a pair of side seal portions are formed by joining both sides of the abdominal portion and both sides of the dorsal portion.
  • the side seal portion has a fused portion in which the ventral portion and the back portion are fused together, and a bonding strength reducing agent is disposed between the sheets in the side seal portion.
  • the bonding strength reducing agent is distributed more in the outer portion of the side seal portion than in the inner portion in the width direction of the side seal portion. It is described that with such a configuration, the side seal portion can be prevented from being peeled off when worn, and the side seal portion can be easily torn when undressed.
  • the elastic sheet shrinks toward the stretchable regions without involving the first sheet layer and the second sheet layer, and at least the sides of the side seal portions contract. It does not contain an elastic sheet or its melt in a portion other than the edge.
  • a material material for the side sealing portion of a pants-type disposable wearing article
  • ultrasonic bonding is performed by pressing the material against the anvil with the horn. do.
  • the material does not contain an elastic sheet like the pants-type disposable wearing article of Patent Document 9
  • the thickness of the material is thinner than when the elastic sheet is contained, so the horn indirectly strongly hits the anvil.
  • a load is likely to be applied to the horn, which is likely to lead to failure of the ultrasonic bonding apparatus.
  • the elastic sheet in the side non-stretchable regions, is shrunk toward the stretchable region without accompanying the first sheet layer and the second sheet layer.
  • wrinkles are generated in the first sheet layer and the second sheet layer adjacent to the contracted portion of the elastic sheet, resulting in poor touch feeling.
  • the wearer since the part looks rough from the outside, the wearer may have a preconceived notion that it looks bad and that the touch feels bad.
  • the side non-stretchable regions provided in the pants-type disposable wearing article of Patent Document 9 are not stretchable, the amount of stretching around the waist is less than that of the pants-type disposable wearing article without the side non-stretchable regions. It is easy for people with a body type to not wear it or feel tight after wearing it.
  • the pants-type disposable wearing article of Patent Document 10 has the effect of preventing lateral tearing, but does not disclose a configuration for easily peeling off the side seal portions. Furthermore, the underpants-type wearing article of Patent Document 11 must be coated with a bonding strength reducing agent, which poses a problem of high initial cost.
  • the main object of the present invention is to make it easy to peel off the side seal portion while arranging the elastic sheet in the side seal portion.
  • An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, and an inner body attached to the middle part in the width direction of the outer body and extending over both front and rear sides of the crotch part. , a side seal portion in which both sides of the exterior body of the front body and both sides of the exterior body of the back body are welded, respectively, a waist opening and a pair of left and right leg openings,
  • the outer body includes first regions located on both sides in the width direction of the front body and both sides in the width direction of the back body, and second regions located on the center side in the width direction of the first region and stretchable in the width direction.
  • the exterior body has a first sheet layer, a second sheet layer, and an elastic sheet interposed between the first sheet layer and the second sheet layer, The first sheet layer and the second sheet layer are joined at a number of spaced first joints through joint holes penetrating the elastic sheet, the size of the first joint in the first region is larger than the size of the first joint in the second region;
  • a pants-type disposable wearing article characterized by:
  • the exterior body of this aspect has a first region and a second region.
  • the first regions are located on both sides in the width direction of the front body and both sides in the width direction of the back body, and the second regions are located on the center side in the width direction of the first regions.
  • the first region includes a side seal portion.
  • the second region is a region that expands and contracts in the width direction in the product state, and is not a region that does not expand and contract in the width direction in the product state.
  • the portion where the exterior body and the interior body overlap is processed so that the exterior body does not expand or contract in the width direction. ), but refers to the area where the exterior body and the interior body do not overlap and expand and contract in the width direction.
  • the outer body has a first sheet layer, a second sheet layer, and an elastic sheet sandwiched between these layers.
  • the first sheet layer and the second sheet layer are joined at a number of spaced apart first joining portions through joining holes passing through the elastic sheet.
  • the size of the first joint in the first region is larger than the size of the first joint in the second region.
  • the size of the bonding hole formed in the first bonding portion in the first region is the size of the first bonding portion in the second region. It is larger than the size of the joint hole formed in one joint.
  • the second joint formed for side sealing can easily enter the joint hole formed in the first region.
  • the side seal portion can be easily peeled off.
  • the average area of the first joints provided in the first region is 2.3 times or more the average area of the first joints provided in the second region. More preferably, the average area of the first joints provided in the second region is 2.5 times or more the average area of the first joints provided in the second region.
  • the size of the bonding hole in the first region is larger than the size of the bonding hole in the second region.
  • the aforementioned average area can be determined by the average value of the areas of a plurality of joint holes located within a predetermined range.
  • the above-mentioned predetermined range can be arbitrarily determined, for example, a square range of 10 mm in the front-rear direction and 10 mm in the width direction can be determined as the predetermined range. You can change it arbitrarily.
  • the predetermined range is preferably the same for the first area and the second area. For example, if the predetermined range of the first region is a square range of 10 mm in the front-back direction and 10 mm in the width direction, the predetermined range of the second region is also a square range of 10 mm in the front-back direction and 10 mm in the width direction. preferably.
  • the average area of the bonding holes provided in the first region is 1.5 times or more the average area of the bonding holes provided in the second region. is more preferably twice or more the average area of the bonding holes provided in the second region.
  • the first sheet layer and the second sheet layer of the front body and the first sheet layer and the second sheet layer of the back body are joined at a plurality of second joints spaced apart in the front-rear direction,
  • the pants-type disposable wearing article according to any one of the first to fourth aspects, wherein 50% or more of the total area of the second joint portion is located inside the joint hole formed in the first region.
  • the greater the ratio of the area of the second joints present inside the joint hole with respect to the total area of the plurality of second joints present within a predetermined range the more the first sheet layer and the second sheet It is possible to prevent the bonding of the layers from becoming strong, and as a result, the side seal portion is easily peeled off.
  • the elastic sheet is stretchable in the width direction
  • the underpants-type disposable wearing article according to the sixth aspect wherein the shape of the first joint hole in the first region is a straight line extending in the front-rear direction or a concave shape recessed inward from both sides in the width direction.
  • the shape of the joint hole formed when the first joint portion is provided expands in the width direction. At this time, if the shape of the first joint is also widened in the width direction, a gap is less likely to occur between the outer edge of the first joint and the edge of the joint hole, so the second joint is formed inside the joint hole.
  • the installation locations of the first joint portion and the second joint portion are likely to overlap, and as a result, the side seal portion is less likely to peel off.
  • the shape of the first joint portion of the first region is a straight line extending in the front-rear direction, or a concave shape that is recessed inward from both sides in the width direction, so that the outer edge of the first joint portion is joined.
  • a gap is easily generated between the holes to make it difficult for the first joint portion and the second joint portion to overlap each other. As a result, peeling of the side seal portion can be facilitated.
  • the number of laminated layers of the side seal portion is different along the front-rear direction, According to any one of the first to seventh aspects, the area of the joint hole in the portion of the side seal portion where the number of layers is large is smaller than the area of the joint hole in the portion of the side seal portion where the number of layers is small. Pants type disposable wearing article.
  • the bonding strength of the side seal tends to be strong in areas where the number of side seal layers is large, and the bonding strength of the side seal tends to be weak in areas where the number of side seal layers is small. be. Therefore, in order to facilitate peeling of the side seal portion, it is important to facilitate peeling of the portion of the side seal portion having a large number of laminated sheets.
  • the area of the joint hole in the portion where the number of stacked side seal portions is large is made smaller than the area of the joint hole in the portion where the number of stacked side seal portions is small. Compared to the area of the joint hole in the portion where the number of laminated layers of the side seal portion is small, the area of the joint hole in the portion where the number of laminated layers of the side seal portion is large is large.
  • advantages such as the fact that the side seal portion can be easily peeled off while the elastic sheet is arranged in the side seal portion are brought about.
  • FIG. 2 is a plan view (inner surface side) of the underpants-type disposable diaper in an unfolded state; 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state; FIG. FIG. 2 is a plan view showing only the essential parts of the underpants-type disposable diaper in an unfolded state; (a) is a cross-sectional view taken along line CC of FIG. 1, and (b) is a cross-sectional view taken along line EE of FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a cross-sectional view taken along the line BB of FIG.
  • FIG. 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state;
  • FIG. (a) is a cross-sectional view taken along line CC of FIG. 7, and
  • (b) is a cross-sectional view taken along line EE of FIG.
  • (a) is a plan view of the main part of the elastic region,
  • (b) is a cross-sectional view taken along line DD of (a),
  • (c) is a cross-sectional view of the worn state, and
  • (d) is a cross-sectional view of the natural length state. It is a top view which shows various shapes of a 1st joint part.
  • FIG. 10 is a plan view of the stretchable region in an unfolded state;
  • FIG. 10 is a plan view of the stretchable region in an unfolded state;
  • FIG. 10 is a plan view of the stretchable region in an unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the stretchable region in the unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the elastic region in a natural length state;
  • (a) is a cross-sectional view taken along the line DD of FIG. 12, and
  • (b) is a cross-sectional view in a natural length state.
  • FIG. 10 is a plan view of the stretchable region in an unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the stretchable region in the unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the elastic region in a natural length state;
  • FIG. 10 is a plan view of the stretchable region in an unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the stretchable region in the unfolded state;
  • FIG. 4 is a plan view showing an enlarged main part of the elastic region in a natural length state;
  • FIG. 4 is a cross-sectional view schematically showing a cross-section of a principal part of an exterior body elongated to some extent
  • FIG. 4 is a cross-sectional view schematically showing a cross-section of a principal part of an exterior body elongated to some extent
  • (a) a trace diagram of a plane photograph of a sheet joint formed in a first welding mode
  • (b) a trace diagram of a plane photograph of a sheet joint formed in a third welding mode
  • (a) is a plan view of the essential part of the non-stretchable region
  • (b) is a cross-sectional view taken along line DD of (a)
  • (c) is a cross-sectional view of the worn state
  • (d) is a cross-sectional view of the natural length state.
  • FIG. 4 is a plan view of the main part of the non-stretchable region; 1 is a schematic diagram of an ultrasonic sealing device; FIG. It is the schematic which shows the manufacturing flow of an underpants type disposable diaper.
  • Fig. 2 is an enlarged plan view showing the essential parts of the underpants-type disposable diaper in an unfolded state; It is a top view which shows the variation of the installation position of a 1st joint part and a 2nd joint part. It is an enlarged plan view near the boundary between the first area and the second area.
  • the dotted pattern portion in the figure indicates an adhesive as a joining means for joining each component located on the front side and the back side, and solid, bead, curtain, summit or spiral application of hot melt adhesive, or Pattern coating (transfer of hot-melt adhesive by letterpress method) or the like, or alternatively or together with this, the fixing portion of the elastic member is formed by coating the outer peripheral surface of the elastic member with a comb gun or Surewrap coating. It is.
  • Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation.
  • a joining means for joining each constituent member a means by material welding such as heat sealing or ultrasonic sealing can be used.
  • nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose.
  • Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra.
  • Fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and these can also be mixed and used.
  • nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure.
  • Non-woven fabrics point-bonded non-woven fabrics, laminated non-woven fabrics (including SSS non-woven fabrics in which the same or similar non-woven fabric layers are laminated, SMS non-woven fabrics in which different non-woven fabric layers are laminated, in which a meltblown layer is sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), etc.
  • any of these nonwoven fabrics can be used.
  • Laminated nonwoven fabrics are manufactured as a single nonwoven fabric containing all layers, and all layers have undergone a fiber bonding process, and multiple nonwoven fabrics manufactured separately are pasted together by a joining means such as a hot-melt adhesive. Does not include matching items.
  • FIG. 1 to 6 show pants-type disposable diapers.
  • LD longitudinal direction
  • WD indicates the width direction.
  • This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an outer body 20 forming a front body F and a back body B, and an inner body 10 fixed and integrated to the inner surface of the outer body 20.
  • the inner body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12 .
  • the inner body 10 and the outer body 20 are joined to the front body F and the back body B. are folded at the center in the front-rear direction LD (longitudinal direction), which is the boundary between the two, and both side portions thereof are welded to each other to form the side seal portion 21 .
  • LD front-rear direction
  • the inner body 10 has a structure in which an absorbent body 13 is interposed between a top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like.
  • the sheet 11 absorbs and retains the excreted fluid that has permeated through it.
  • the planar shape of the interior body 10 is not particularly limited, it is generally rectangular as shown in FIG.
  • a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used as the top sheet 11 covering the front side (skin side) of the absorbent body 13.
  • a liquid-impermeable plastic sheet such as polyethylene or polypropylene
  • a microporous sheet obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching the sheet in a uniaxial or biaxial direction can be preferably used.
  • the absorber 13 is a known one, for example, a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, optionally mixed or fixed with a superabsorbent polymer. can be used.
  • the absorber 13 can be wrapped with a liquid-permeable and liquid-retaining wrapping sheet 14 such as crepe paper, if necessary, for shape and polymer retention.
  • the shape of the absorbent body 13 is formed in a substantially hourglass shape with a constricted portion 13N narrower than the front and rear sides in the crotch portion.
  • the size of the constricted portion 13N can be appropriately determined, but the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of its narrowest portion is 40% of the total width of the absorbent body 13. It can be about 60%.
  • the inner body 10 has such a constricted portion 13N, if the planar shape of the inner body 10 is substantially rectangular, a portion of the inner body 10 corresponding to the constricted portion 13N of the absorbent body 13 does not have the absorbent body 13.
  • Absorber side portions 17 are formed.
  • the liquid-impermeable sheet 12 is folded back on both sides in the width direction of the absorbent body 13 together with the top sheet 11 .
  • the liquid-impermeable sheet 12 it is desirable to use an opaque sheet so that the brown color of feces and urine does not appear.
  • a film obtained by internally adding a pigment or filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, or barium sulfate to a plastic is preferably used.
  • the three-dimensional gathers 90 include a fixing portion 91 fixed to the side portion of the back surface of the inner body 10, and the inner body 10 extending from the fixing portion 91 to the side of the inner body 10. and the front and rear ends of the body portion 92 are attached to the side portions of the surface of the interior body 10 (the top sheet 11 in the illustrated example) with a hot melt adhesive 95b or the like. It has a fixed lying down portion 93 and a free portion 94 between which the lying down portion 93 is not fixed. Each of these parts is formed by a gather sheet 95 formed by folding a sheet of nonwoven fabric or the like into a double sheet.
  • the gathered sheet 95 is attached over the entire front-to-rear direction of the inner body 10 , the fallen portions 93 are provided on the front and rear sides of the non-absorbent side portion 17 , and the free portions 94 are on both front and rear sides of the non-absorbent side portion 17 . extended. Between the double gather sheets 95, a gather elastic member 96 is arranged at the tip of the free portion or the like. The gather elastic member 96 is for raising the free portion 94 by elastic contraction force as shown in FIG. 5 in the product state.
  • the fixing structure of the gathering elastic member 96 and the gathering sheet 95 is not particularly limited.
  • the gathering elastic member 96 is adhesively fixed to the gathering sheet 95 and the facing surface of the gathering sheet 95 is joined, there is no hot-melt adhesive at the position of the gathering elastic member 96 in the lodged portion 93, and therefore the gathering elasticity is reduced.
  • a structure in which the member 96 and the gather sheet 95 are not adhered to each other and the facing surface of the gather sheet 95 is not joined at the position where the gather elastic member 96 is provided can be employed.
  • the gather elastic member 96 commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. Also, in order to make it difficult to see from the outside, it is preferable to set the thickness to 925 dtex or less, the tension to 150 to 350%, and the interval to 7.0 mm or less. As the gather elastic member 96, a tape-like member having a certain width can be used in addition to the elongated shape as shown in the drawing.
  • the gather sheet 95 Although various nonwoven fabrics can be used as the gather sheet 95, it is particularly preferable to use a nonwoven fabric having a reduced basis weight and excellent breathability in order to prevent stuffiness. Furthermore, the gather sheet 95 is coated with a silicone, paraffin metal, or alkylchromic chloride water repellent agent to prevent permeation of urine and the like, prevent rashes, and improve the touch (dry feeling) to the skin. It is desirable to use a water-repellent nonwoven fabric coated with
  • the back surface of the inner body 10 is joined to the inner surface of the outer body 20 in the inner/outer fixing region 10B (hatched region) with a hot-melt adhesive or the like.
  • the inside/outside fixing region 10B can be determined as appropriate, and can be substantially the entire width direction WD of the inner body 10, but it is preferable that both ends in the width direction are not fixed to the exterior body 20.
  • the outer body 20 has at least a waist portion T of the front body F and a waist portion T of the back body B. It further has an intermediate portion L, which is a range in the front-rear direction.
  • the side edge of the outer body 20 may be positioned more centrally in the width direction than the side edge of the inner body 10 as in the illustrated example, or may be positioned on the outer side in the width direction.
  • the first sheet layer 20A and the second sheet layer 20B As shown in FIG. It has an elastic sheet stretchable structure 20X that is joined through a joining hole 31 that penetrates.
  • portions of the first sheet layer 20A and the second sheet layer 20B may be joined via the elastic sheet 30 at a large number of first joining portions 40 arranged at intervals.
  • the region having the elastic sheet stretchable structure is a stretchable region that is contracted in the width direction due to contraction of the elastic sheet 30 and that is stretchable in the width direction (that is, the stretch direction ED becomes the width direction WD of the diaper).
  • the planar shape of the exterior body 20 is formed by concave leg circumference lines 29 so that the width direction side edges of the intermediate portion L form leg openings, respectively, and the overall shape resembles an hourglass.
  • the outer body 20 may be formed separately from the front body F and the back body B, and the two may be arranged so as to be separated from each other in the front-rear direction LD of the diaper at the crotch portion.
  • the configuration shown in FIGS. 1 and 2 is a configuration in which the elastic sheet elastic structure 20X extends to the waist edge 23.
  • the waist edge 23 can be stretched. Since there is a possibility that problems such as insufficient tightening may occur, as shown in FIGS.
  • An elastic structure with a waist elastic member 24 can also be provided.
  • the waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction LD, and provides elastic force so as to tighten the circumference of the body.
  • the waist elastic members 24 are not arranged substantially as a bundle with close intervals, but three or more at intervals of about 3 to 8 mm in the front-rear direction so as to form a predetermined elastic zone. , preferably five or more.
  • the elongation rate of the waist elastic member 24 when fixed can be determined as appropriate, it can be about 230 to 320% in the case of normal adult use.
  • the waist elastic member 24 uses thread rubber, but other elongated stretchable members such as flat rubber may be used.
  • an elastic sheet 30 may be provided at the waist end 23, and an elongated waist elastic member 24 may be provided at a position overlapping the elastic sheet 30, so that both elastic members may be used to form a stretchable structure.
  • the edge portion of the leg opening in the exterior body 20 is not provided with an elongated elastic member extending along the leg opening.
  • An elongated elastic member may be provided instead of the elastic sheet 30 of the part.
  • an intermediate part L between the waist part T of the front body F and the waist part T of the back body B is not provided with the elastic sheet elastic structure 20X.
  • An elastic sheet stretchable structure 20X is continuously provided in the front-rear direction LD from the inside of the waist portion T of F to the inside of the waist portion T of the back body B through the intermediate portion L, or either the front body F or the back body B.
  • Appropriate modification such as provision of the elastic sheet expansion structure 20X only in the upper part is also possible.
  • the outer body 20 includes first regions 81 located on both sides of the front body F in the width direction WD and both sides of the back body B in the width direction WD, and second regions 81 located on the center side in the width direction WD of the first regions 81 . It has a region 82 .
  • the side seal portion 21 is included in the first region 81 .
  • the first region 81 may include portions (hereinafter referred to as “adjacent end portions 83”) that are adjacent to the inside of the side seal portions 21 in the width direction WD and located at both end portions in the width direction WD of the pants-type disposable wearing article. be.
  • a method for determining whether or not the first region 81 includes the adjacent end portion 83 is not particularly limited. are compared, and if both have approximately the same size, the first region 81 includes the adjacent end 83; if the two have different sizes, the first region 81 does not include the adjacent end 83 can judge.
  • the width W3 of the adjacent end portion 83 (starting from the edge of the side seal portion 21 on the inside in the width direction WD and extending from there to the inside in the width direction WD). length) is preferably 5 to 20 mm, more preferably 10 to 15 mm.
  • the width W3 of the adjacent end portion 83 is about 0.5 to 5% when the overall width W1 of the pants-type disposable wearing article is 100%. and more preferably about 1 to 3%.
  • the materials constituting the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30 move at high speed. It is difficult to increase only the area of the portion 40, and there is a high possibility that the size of the first joint portion 40 adjacent to the side seal portion 21 (near portion adjacent to the side seal portion 21) also increases. Therefore, as described above, the length of the width direction WD of the first region 81 is given a certain width, and the adjacent end portion 83 is also included in the first region 81 in some cases. On the other hand, a typical position of the second region 82 is the central portion in the width direction WD of the pants-type disposable wearing article.
  • a region having the elastic sheet stretchable structure 20X in the exterior body 20 has a stretchable region that is stretchable in the width direction WD.
  • the stretchable region 80 is contracted in the width direction WD due to the shrinkage force of the elastic sheet 30 and is expandable in the width direction WD. More specifically, in a state in which the elastic sheet 30 is stretched in the width direction WD, the elastic sheet 30 is stretched at intervals in the width direction WD and the front-rear direction LD (the direction perpendicular to the stretch direction).
  • the elastic sheet elastic structure 20X is formed, and the elastic sheet 30 remain unbroken in the width direction WD, and the first sheet layer 20A and the second sheet layer 20B are shrunk by the contractile force of the elastic sheet 30 to form the contraction folds 25.
  • stretchability can be imparted.
  • the elastic sheet 30 may have a linear continuous portion 32 along the width direction WD as in the example shown in FIG. 9, or the examples shown in FIGS. It is not necessary to have the said part 32 like .
  • the elastic region 80 swells in the direction in which the first sheet layer 20A and the second sheet layer 20B between the first joint portions 40 separate from each other in the natural length state.
  • a contraction fold 25 extending in the front-rear direction LD is formed, and even in a mounted state in which it is stretched to some extent in the width direction WD, the contraction fold 25 is stretched but remains.
  • the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the first joining portion 40.
  • FIG. 9C assuming the mounted state and FIG.
  • Ventilation is added by this ventilation hole 33 .
  • the elastic sheet 30 has a linearly continuous portion 32 along the width direction WD, further contraction of the elastic sheet 30 causes the joint hole 31 to narrow in the natural length state. A gap is hardly formed between 31 and the first joint portion 40, and if the elastic sheet 30 does not have a linearly continuous portion along the width direction WD, a vent hole 33 remains.
  • the maximum elongation in the width direction WD of the elastic region 80 is desirably 190% or more (preferably 200 to 220%).
  • the maximum elongation of the elastic region 80 is substantially determined by the elongation rate of the elastic sheet 30 at the time of manufacture, but based on this, it decreases due to factors that inhibit contraction in the width direction WD.
  • the main factor of such a hindrance is the ratio of the length L of the first joint portion 40 per unit length in the width direction WD, and the larger the ratio, the lower the maximum elongation.
  • the length L of the first joint 40 has a correlation with the area ratio of the first joint 40 , so the maximum elongation of the stretchable region 80 can be adjusted by the area ratio of the first joint 40 .
  • the stretching stress of the stretchable region 80 is It can be adjusted by the crossing angle formed by the direction of continuation of the unbonded bands 51 and 52 in which the portions not having the first joint are continuous and the stretching direction ED. It is preferable that the acute side crossing angles ⁇ 1 and ⁇ 2 formed with the stretching direction ED are set to be larger than 0 degree and 45 degrees or less, particularly in the range of 10 to 30 degrees.
  • first joint portion 40A of first region 81 0.3 to 4.0 mm 2 (more preferably 0.3 to 2.0 mm 2 )
  • Area ratio of first joint portion 40A of first region 81 4.0 to 19.1% (more preferably 3.0 to 14.0%)
  • first joints 40 (40B) of the second region 82 and the area of each of the first joints 40 can be appropriately determined.
  • Area of first joint portion 40B of second region 82 0.14 to 2.0 mm 2 (more preferably 0.14 to 1.0 mm 2 )
  • Area ratio of first joint portion 40B in second region 82 1.8 to 10.6% (more preferably 1.8 to 7.0%)
  • the size of the first joint portion 40A of the first region 81 is preferably larger than the size of the first joint portion 40B of the second region 82.
  • the average value of the areas of the plurality of first joints 40A provided in the first region 81 is 2.2.2 of the average value of the areas of the plurality of first joints 40A provided in the second region 82 It is preferably 0 times or more, more preferably 2.3 times or more, and even more preferably 2.5 times or more.
  • the second joint portion 41 can be easily provided inside the joint holes 31A of the first region 81.
  • the part 21 can be made easier to peel off.
  • the maximum elongation and elongation stress of the elastic region 80 can be adjusted by the area of the first joint portion 40, as shown in FIG. A plurality of different regions can be provided to change the fit depending on the site.
  • the edge region 82 of the leg opening has a higher area ratio of the first joint portion 40 than the other regions, so that the elongation stress is weak and the region flexibly expands and contracts.
  • each of the first joint portions 40 and the joint holes 31 in their natural length state can be determined as appropriate, but may be circular, elliptical, triangular, rectangular (see FIGS. 9, 11, and 15), or rhombic (see FIGS. 9, 11, and 15).
  • the dimensions of the individual first joints 40 are not particularly limited, but the maximum length 40y (substantially equal to the dimension 31y of the joint hole 31 in the orthogonal direction) is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm.
  • the maximum width 40x is preferably 0.1 to 3.0 mm, and particularly preferably 0.1 to 1.1 mm in the case of a shape elongated in the direction XD orthogonal to the stretching direction.
  • the shape of the first joint portion 40A of the first region 81 is not widened in the width direction WD.
  • the shape of the first joint portion 40A of the first region 81 is made wider in the width direction WD (for example, the configurations shown in FIGS. 26C and 26E)
  • the elastic sheet 30 expands and contracts in the width direction WD.
  • the gap between the outer edge of the first joint portion 40A and the edge of the joint hole 33 is less likely to occur. This is because the installation locations of the side seal portions 41 are likely to overlap, and as a result, the side seal portion 21 may become difficult to peel off.
  • the shape of the first joint portion 40A of the first region 81 may be changed to, for example, a linear shape extending in the front-rear direction LD (forms shown in FIGS. 26(a) and 26(b)), or a concave shape extending inward from both sides in the width direction.
  • a concave shape the form of FIG. 26(d)
  • the width direction WD of the joint hole 31A of the first region 81 is increased from the outermost edge of the joint hole 31A in the width direction WD to the outermost end of the joint hole 33 in the width direction WD.
  • the length W4 to the edge is preferably about 2 to 10 mm, more preferably about 3 to 5 mm.
  • the length from the innermost edge in the width direction WD of the joint hole 31A of the first region 81 to the innermost edge in the width direction WD of the joint hole 33 can be provided with the same length as described above. preferable.
  • the arrangement pattern of the first joints 40 of the elastic region 80 is not particularly limited, and any pattern (see, for example, Patent Documents 1 to 8) can be adopted.
  • a non-bonded band in which portions not having the first bonded portion are continuous exist in an oblique grid pattern.
  • the illustrated example shows a particularly preferable example.
  • the first non-bonded bands 51 linearly continuous along the first direction 51d intersecting (the acute side crossing angle ⁇ 1) are repeatedly present at intervals in the direction orthogonal to the first direction 51d.
  • a large number of first joint portions 40 and joint holes 31 are provided at intervals between adjacent first non-joint bands 51 in the stretchable region 80 .
  • the unit structure including a plurality of first non-bonded bands 51 having different first widths 51w determined as the width in the direction orthogonal to the first direction 51d is orthogonal to the first direction 51d in the elastic region 80. Repeatedly exist in the direction.
  • the unit structure described above is not limited by the size of the width 51w as long as it includes a plurality of first non-bonded bands 51 having different first widths 51w.
  • the width 51w is preferably 1.2 to 60 times the width of the first non-bonded strip 51 having the nearest width 51w, and preferably 0.01 to 0.8 times the width 51w.
  • the unit structure described above may have different first widths 51w in all the first non-bonded bands 51 as long as it includes a plurality of first non-bonded bands 51 with different first widths 51w.
  • the first width 51w of some first non-bonded strips 51 may be different from the first width 51w of the other single or multiple first non-bonded strips 51. As shown in FIG.
  • the maximum value of the first width 51w in the first non-bonded band 51 is the maximum value of the widths in the direction perpendicular to the continuous direction in all the non-bonded bands 51 and 52 that are different in inclination direction and common.
  • the maximum value of the first width 51w in the first non-bonded band 51 can be determined as appropriate, but it is preferably 1.2 to 60 times the first non-bonded band 51 with the nearest width 51w. preferable.
  • the width of all the non-bonded bands 51 and 52 including the first non-bonded band 51 is not limited in the direction perpendicular to the continuous direction, but it is usually within the range of 0.02 to 5 mm. is preferred. Needless to say, the width of the non-bonded bands 51 and 52 in the direction perpendicular to the direction of continuation is the first width 51w of the first non-bonded band 51, which is a linearly continuous portion. So it is monospaced.
  • a first interval 51s which is defined as the interval in the direction orthogonal to the first direction 51d between adjacent first non-bonded bands 51, can be determined as appropriate. Therefore, the first spacing 51s may be the same as, wider, or narrower than the first width 51w of the adjacent first non-bonded bands 51 . As one preferable example, the maximum value of the first width 51w in the first non-bonded band 51 in the unit structure is smaller than the maximum value of the first spacing 51s.
  • the maximum value of the first width 51w in the first non-bonded band 51 can be determined as appropriate, but is preferably 0.01 to 9 times the maximum value of the first spacing 51s.
  • the interval in the direction perpendicular to the continuous direction in all the non-bonded bands 51 and 52 including the first non-bonded band 51 is not particularly limited, but is usually within the range of 0.3 to 50 mm. is preferred. Needless to say, the interval in the direction orthogonal to the continuous direction in the non-bonded bands 51 and 52 is the first interval 51s in the first non-bonded band 51, and is equal to the continuous direction. .
  • non-bonded bands 51 and 52 are linearly continuous along a second direction 52d that intersects the stretch direction ED at an acute angle (acute side crossing angle ⁇ 2) other than the first direction 51d.
  • the two no-bonded bands 52 may be repeatedly present at intervals in the direction orthogonal to the second direction 52d, or the second no-bonded bands 52 may not exist.
  • One preferred form having the second non-bonded band 52 is that the elastic region 80 has the non-bonded bands 51 and 52 formed in a slanted lattice pattern, and the first non-bonded band 51 is formed in a slanted lattice-like non-bonded band.
  • the first direction 51d and the second direction 52d have opposite positive and negative inclinations with respect to the expansion/contraction direction ED.
  • the acute side crossing angles ⁇ 1 and ⁇ 2 with respect to the stretching direction ED of the first direction 51d and the second direction 52d are respectively 5 to 45 degrees, particularly 10 to 30, so that the stretchability in the stretchable region 80 is sufficiently ensured. can be done.
  • the second non-bonded band 52 is provided as in the example shown in FIG. It is preferable to arrange the first joint 40 so that it does not have two non-bonded bands 52 . As a result, in the stretchable region 80 , the oblique striped pattern formed by the contraction folds 25 of the first non-bonded band 51 and the continuous portion of the elastic sheet 30 therein becomes more visible.
  • the first joints 40 are aligned in the first direction 51d between the adjacent first non-bonded bands 51.
  • the acute side crossing angle ⁇ 3 in the longitudinal direction with respect to the direction orthogonal to the expansion/contraction direction ED is within 10 degrees, and the maximum dimension 40e in the expansion/contraction direction ED is 0.1 to 0.4 mm. This is preferable because a larger dimension in the stretching direction ED of the bonding band 51 can be ensured, and a decrease in stretchability can be suppressed.
  • the unit structure includes a wide first non-bonded band 51 having a maximum first width 51w and a narrow first non-bonded band 51 having a narrower first width 51w.
  • the acute crossing angle in the longitudinal direction with respect to the second direction 52d is within 5 degrees
  • the elongated first joints 40 having a maximum dimension 40f of 0.1 to 0.4 mm in the direction orthogonal to the longitudinal direction are arranged in the first direction 51d with a gap therebetween.
  • the acute crossing angle ⁇ 3 in the longitudinal direction with respect to the first direction 51d is 45 degrees or more, and the maximum dimension 40g in the direction orthogonal to the longitudinal direction is 0.00. It is preferable that the elongated first joints 40 of 1 to 0.4 mm are aligned in the first direction 51d at intervals. Due to the shape and arrangement of the first joint portion 40, the contiguous folds 25 of the first non-bonded band 51 and the continuation portion of the elastic sheet 30 therein are particularly visually visible with a smaller area of the first joint portion 40. become emphasized.
  • the row of the first joint portions 40 located between the adjacent non-bonded bands 51 and 52 may be one row or multiple rows.
  • the intervals between the first joints 40 in the row direction be regular, not all the intervals need to be constant, and some intervals may be different.
  • Intermediate non-stretchable area As shown in FIG. 7, of the region having the elastic sheet stretchable structure 20X in the exterior body 20, a part or the whole of the portion overlapping the absorber 13 (preferably including substantially the entire inner/outer fixing region 10B) is provided with an intermediate elastic. Elastic regions 70 may be provided. The arrangement of the stretchable regions 80 and the intermediate non-stretchable regions 70 can be determined as appropriate. For example, an intermediate non-stretchable region 70 may be provided from a region overlapping the absorbent body 13 to a region located in the width direction WD or the front-rear direction LD and not overlapping the absorbent body 13 . The intermediate non-stretchable region 70 means that the maximum elongation in the stretching direction is 120% or less. The maximum elongation of the intermediate non-stretchable region 70 is preferably 110% or less, more preferably 100%.
  • each first joint portion 40 in the intermediate non-stretchable region 70 is not particularly limited, and can be appropriately selected from shapes similar to those described in the section on the stretchable region 80 .
  • the area ratio of the first joints 40 in the intermediate non-stretchable region and the area of the individual first joints 40 can be determined as appropriate. is small and the area ratio of the first joint portion 40 is low, so that the intermediate non-stretchable region 70 does not become hard.
  • Area of first joint 40 0.10 to 0.75 mm 2 (especially 0.10 to 0.35 mm 2 )
  • Area ratio of first joint 40 4 to 13% (especially 5 to 10%)
  • the elastic limit elongation and elongation stress of the stretchable region 80 can be adjusted by adjusting the area of the joint 40. Therefore, as shown in FIG. 7, it is also possible to provide a plurality of regions having different area ratios of the joints 40 in the stretchable region 80, and to change the fit depending on the region.
  • the edge region 182 of the leg opening has a higher area ratio of the joints 40 than the other regions, and therefore has a weaker elongation stress and is a flexibly stretchable region.
  • the edge region 182 of the leg opening in the back body B also has a higher area ratio of the joints 40 than the other region, so that the extension stress is weak and the region flexibly expands and contracts.
  • a region 84 in the middle of the width direction WD of the portion of the front body F that overlaps the inner body 10 has a higher area ratio of the sheet joints 40 than other regions, and a weaker elongation stress.
  • the elastic limit elongation is also in a smaller region.
  • the intermediate non-stretchable region 70 is formed by closely arranging the first joints 40 so that the first sheet layer 20A and the second sheet layer 20B are not shrunk by the contractile force of the elastic sheet 30 and folds are not formed. be able to. Specific examples of methods for forming the intermediate non-stretchable region 70 include those described in Patent Documents 3 to 6, for example.
  • FIGS. 21 and 22 show an example of the intermediate non-stretchable region 70 described in Patent Document 6.
  • FIG. 1 the joint holes 31 are arranged in a zigzag pattern more densely than a certain degree, and although the elastic sheet 30 is continuous in the stretch direction ED, the presence of the joint holes 31 causes the joint holes 31 to linearly extend along the stretch direction ED. It does not have a continuous part.
  • the vent holes 33 are opened with substantially the same size in both the natural length state and the unfolded state. As shown in FIG.
  • the joint holes 31 are arranged in a zigzag pattern, and the center interval 31e of the joint holes 31 in the front-rear direction LD is set to be shorter than the length 31y of the joint holes 31 in the front-rear direction LD.
  • the linear continuity in the width direction WD can be almost completely eliminated while maintaining the continuity, and the appearance is also favorable as shown in FIG. In this case, it is preferable that the center interval 31f of the joint holes 31 in the width direction WD be shorter than the length 31x of the joint holes 31 in the width direction WD.
  • the means for joining the first sheet layer 20A and the second sheet layer 20B in the first joining portion 40 is not particularly limited.
  • the bonding of the first sheet layer 20A and the second sheet layer 20B at the first bonding portion 40 may be performed using a hot-melt adhesive, or may be performed by means of material welding such as heat sealing or ultrasonic sealing. good.
  • the first joining portion 40 is formed by material welding.
  • a first welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by a melted and solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B at 40 (Fig. 18(a))
  • a second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by the melted and solidified material 30m of all or most of the elastic sheet 30 at the first joint 40. See FIG. 18(b)
  • a third welding mode see FIG. 18(c) combining both of these may be used, but the second and third welding modes are preferred.
  • the first sheet layer 20A and the second sheet layer 20B are partially melted and solidified 20m, and all or most of the elastic sheet 30 at the first joint portion 40 is melted and solidified 30m. It is a form in which the layer 20A and the second sheet layer 20B are joined.
  • the elastic sheet 30 shown in white is placed between the melted and solidified fibers 20m of the first sheet layer 20A or the second sheet layer 20B shown in black.
  • the elastic sheet 30 is between the melted and solidified fibers 20m of the first sheet layer 20A or the second sheet layer 20B. No molten solidified product is seen.
  • the first sheet layer 20A and the second sheet layer 20B are bonded to each other by using the molten and solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B as an adhesive.
  • the sheet layer 20B it is preferable that a part of the first sheet layer 20A and the second sheet layer 20B is not melted so that the first joining portion 40 is not hardened.
  • first sheet layer 20A and the second sheet layer 20B are nonwoven fabrics, all the fibers of the first joint portion 40 must be melted so that a part of the first sheet layer 20A and the second sheet layer 20B does not melt. (Including not only the core of the conjugate fiber but also the central part of the monocomponent fiber) remains, but the surrounding part (including not only the sheath of the conjugate fiber but also the surface layer side part of the monocomponent fiber) is in a form of melting or partially Some of the fibers are not melted at all, while the rest of the fibers are all melted, or the core remains but its surrounding portion melts.
  • the peel strength is high.
  • the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30 and the heating temperature during the formation of the first joint portion 40. It can be produced by sandwiching the elastic sheet 30 between 20A and the second sheet layer 20B, applying pressure and heat to the portion that will become the first joint 40, and melting only the elastic sheet 30. As shown in FIG.
  • the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30, It can be manufactured by sandwiching the elastic sheet 30, applying pressure and heat to the portion that will be the first joint 40, and melting at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30. .
  • the melting point of the elastic sheet 30 is preferably about 80 to 145.degree. C., and the melting points of the first sheet layer 20A and the second sheet layer 20B are about 85 to 190.degree. is preferable, and the difference between the melting point of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic sheet 30 is preferably about 60 to 90.degree. Also, the heating temperature is preferably about 100 to 150.degree.
  • the melted and solidified material 30m of the elastic sheet 30 is the first joint as shown in FIG. 19(c). Although it may permeate between the fibers throughout the thickness direction of the first sheet layer 20A and the second sheet layer 20B in the part 40, as shown in FIG. Alternatively, as shown in FIG. 19(b), the flexibility of the first joint portion 40 is higher in a form in which the fibers hardly permeate between the fibers of the first sheet layer 20A and the second sheet layer 20B.
  • FIG. 23 shows an example of an ultrasonic sealing device suitable for forming the second welded form and the third welded form.
  • this ultrasonic sealing device when forming the first joint 40, the first sheet layer is placed between the anvil roll 60 having the protrusions 60a formed on the outer surface in the pattern of the first joint 40 and the ultrasonic horn 61. 20A, elastic sheet 30 and second sheet layer 20B.
  • the feed drive roll 63 and the nip roll 62 are made slower than the transfer speed after the anvil roll 60 and the ultrasonic horn 61, the feed drive roll 63 and the nip roll 62
  • the elastic sheet 30 is stretched to a predetermined elongation rate in the MD direction (machine direction, flow direction) along the path from the nip position by the anvil roll 60 and the ultrasonic horn 61 to the seal position by the ultrasonic horn 61 .
  • the elongation rate of the elastic sheet 30 can be set by selecting the speed difference between the anvil roll 60 and the feeding drive roll 63, and can be set to about 300% to 500%, for example.
  • 62 is a nip roll.
  • the first sheet layer 20A, the elastic sheet 30 and the second sheet layer 20B sent between the anvil roll 60 and the ultrasonic horn 61 are laminated in this order, and the protrusion 60a and the ultrasonic horn 61 While applying pressure between them, they are heated by the ultrasonic vibration energy of the ultrasonic horn 61 to melt only the elastic sheet 30, or to melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30.
  • the first sheet layer 20A and the second sheet layer 20B are joined through the joint hole 31 at the same time as the joint hole 31 is formed in the elastic sheet 30 . Therefore, in this case, the area ratio of the first joint portion 40 is selected by selecting the size, shape, separation interval, arrangement pattern of the roll length direction and the roll circumferential direction, etc. be able to.
  • the portions of the elastic sheet 30 corresponding to the projections 60a of the anvil roll 60 melt and separate from the surroundings, thereby forming the holes.
  • the portions of the elastic sheet 30 between adjacent joint holes 31 aligned in the stretch direction ED are separated from the portions on both sides of the stretch direction by the joint holes 31, as shown in FIGS. Since the support on both sides of the contraction direction is lost, the center side of the direction LD perpendicular to the contraction direction ED is contracted until it is balanced toward the center side of the contraction direction within the range where continuity in the direction perpendicular to the contraction direction can be maintained. Then, the joint hole 31 expands in the expansion/contraction direction ED.
  • the constituent materials of the first sheet layer 20A and the second sheet layer 20B can be used without any particular limitation, but preferably have air permeability. Therefore, it is preferable to use a nonwoven fabric from these points of view and the point of view of softness. When a non-woven fabric is used, it is preferable that its basis weight is about 10 to 25 g/m 2 . Also, part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers formed by folding one sheet of material and facing each other. For example, as shown in the illustrated embodiment, in the waist end portion 23, the second sheet layer 20B is used as the outer component, and the first sheet layer 20A is used as the folded portion 20C that is folded inward at the waist opening edge.
  • the elastic sheet 30 is interposed therebetween, and in the other portions, the inner component is the first sheet layer 20A, the outer component is the second sheet layer 20B, and the elastic sheet 30 is interposed therebetween. can intervene.
  • the constituent members of the first sheet layer 20A and the constituent members of the second sheet layer 20B are separately provided over the entire front-rear direction LD, and the constituent members of the first sheet layer 20A and the second sheet layer 20B are arranged without folding back the constituent members.
  • An elastic sheet 30 can also be interposed between the components of layer 20B.
  • the elastic sheet 30 is not particularly limited, and may be an elastic film or a stretchable nonwoven fabric as long as it is a thermoplastic resin sheet that itself has elasticity. Moreover, as the elastic sheet 30, in addition to the non-perforated one, the one formed with a large number of holes or slits for ventilation can be used.
  • the tensile strength in the width direction WD is 8 to 25 N / 35 mm
  • the tensile strength in the front-back direction LD is 5 to 20 N / 35 mm
  • the elastic sheet 30 preferably has a tensile elongation of 450 to 1050% in the WD and a tensile elongation of 450 to 1400% in the longitudinal direction LD.
  • the thickness of the elastic sheet 30 is not particularly limited, it is preferably about 20 to 40 ⁇ m.
  • FIG. 24 shows an example of a method of manufacturing a pants-type disposable diaper.
  • This production line has a cross-flow configuration in which the diaper width direction WD is the MD direction (machine direction, line flow direction).
  • the inner body 10 manufactured in 1. is attached to the outer strip 200, it is folded in the center in the CD direction to form both sides of the outer body 20 in the front body F and both sides of the outer body 20 in the back body B.
  • the parts are respectively welded and divided into individual diapers DP.
  • some of the members that are continuous during the manufacturing process are given the same names and symbols as those of the members after manufacturing.
  • this production line has an exterior body assembly process 301, an interior body mounting process 302, a leg opening punching process 303, a folding process 304, and a side seal forming/separating process 305. That is, in the exterior body assembling step 301, as shown in FIG. While being supplied to the ultrasonic sealing devices 60 and 61, the elastic sheet 30 continuous in a belt shape with a predetermined width passes through the drive roll 63 and the nip roll 62 having a feed speed lower than that of the ultrasonic sealing devices 60 and 61, and the speed difference It is supplied to the ultrasonic sealing devices 60 and 61 so as to be sandwiched between the first sheet layer 20A and the second sheet layer 20B while being stretched in the MD direction.
  • one sheet material is divided into two by the slitter 62 in order to separately supply the front and rear first sheet layers 20A.
  • a front and rear sheet material may be supplied integrally like the second sheet layer 20B.
  • one elastic sheet 30 is divided into two by the slitter 62 in order to supply the front and rear elastic sheets 30 separately.
  • the front and rear elastic sheets 30 may be integrally supplied.
  • an anvil roll 60 provided with a large number of protrusions 60a arranged in the pattern of the joints 40 in the stretchable region 80 and the non-stretchable region 70 on the outer peripheral surface thereof,
  • the first sheet layer 20A, the elastic sheet 30 stretched in the MD direction, and the second sheet layer 20B are sandwiched between the ultrasonic horn 61 and the ultrasonic horn 61, and heated by the ultrasonic vibration energy of the ultrasonic horn 61.
  • the elastic sheet 30 is melted to form a through-hole 31 only at the portion pressurized in the thickness direction with respect to the outer peripheral surface of the sonic horn 61, and the first sheet layer 20A and the second sheet layer 20A and the second sheet layer 20A are formed at the position of the through-hole 31.
  • the sheet layers 20B are welded together to form the first joint portion 40 .
  • the exterior strip 200 is formed.
  • the cross-sectional structure after forming the first joint portion 40 is also schematically shown in FIG. 26(a).
  • the illustrated example uses ultrasonic sealing devices 60 and 61, but other devices such as heat sealing can also be used.
  • the elastic sheet 30 is divided at arbitrary points. As a method for dividing the elastic sheet 30, for example, as shown in FIG. A method of linearly cutting the elastic sheet 30 along the CD direction can be adopted by ultrasonically sealing (or heat sealing) with the horn 66 .
  • a pants-type disposable diaper can be formed by basically adopting a known manufacturing process.
  • the inner body 10 manufactured on a separate line is supplied to the outer body 20 formed through the ultrasonic sealing devices 60 and 61 at a predetermined interval in the MD direction. are joined to the exterior body 20 by an appropriate means such as hot-melt adhesive or heat sealing to form the interior assembly bodies 10 and 20.
  • leg opening punching step 303 leg openings are formed by the cutter device 67.
  • the interior assembly 10, 20 is folded at the center of the CD direction (lateral direction orthogonal to the MD direction) in the folding step 304, and then in the side seal part forming step/separating step 305, the individual diapers DP are separated.
  • the outer body 20 of the front body F and the outer body 20 of the back body B are joined to form the side seal portion 21, and the outer body 20 is cut at the boundary Q of each diaper. , an individual diaper DP is obtained.
  • the exterior body 20 has side seal portions 21 at both ends in the width direction WD.
  • the side seal portion 21 has a first sheet layer 20A, a second sheet layer 20B, and an elastic sheet 30 interposed between the first sheet layer 20A and the second sheet layer 20B.
  • the side seal portion 21 has a second joint portion 41 for joining the first sheet layer 20A and the second sheet layer 20B of the front body F and the first sheet layer 20A and the second sheet layer 20B of the back body B. , are provided at predetermined intervals in the front-rear direction LD.
  • the elastic sheet 32 melts when the second joint portion 41 is provided, and the first sheet layer 20A and the first sheet layer 20A are separated from each other. Since the two sheet layers 20B are firmly bonded, the bonding strength of the entire side seal portion 21 is increased, making it difficult to peel off. Therefore, by providing the second joint portion 20B inside the joint hole 31 of the elastic sheet 30, the joint between the first sheet layer 20A and the second sheet layer 20B is prevented from becoming too strong, and as a result, the side seal portion 21 is Makes peeling easy.
  • the joint hole 31 it is preferable that 50% or more of the total area of all the second joints 41 be positioned within the joint hole 31, and 80% or more of the total area of all the second joints 41 be positioned within the joint hole 31. , and most preferably 100% of the total area of all the second joints 41 is positioned within the joint hole 31 .
  • each of the second joint portions 41 in the natural length state can be appropriately determined. , a concave lens shape, a star shape, a cloud shape, or any other shape.
  • the position where the first joint portion 40 is formed and the position where the second joint portion 41 is formed do not overlap inside the joint hole 31 formed in the elastic sheet 30 .
  • the first joint portion 40 is provided inside the joint hole 31 .
  • the second joint portion 41 is provided inside the joint hole 31 if the first joint portion 40 and the second joint portion 41 are overlapped with each other, the presence of the first joint portion 40 causes a strong joint. As a result, the joining force between the first sheet layer 20A and the second sheet layer 20B is further strengthened, and the peeling of the side seal portion 21 becomes difficult. Therefore, it is preferable to provide the second joint portion 41 at a position that does not overlap with the first joint portion 40 as much as possible inside the joint hole 31 .
  • first joint portion 40 is often provided in the central portion of the joint hole 31, so it is preferable to provide the second joint portion 41 on the left or right side of the first joint portion 40, or on both left and right sides.
  • the number of stacked side seal portions 21 often differs along the front-rear direction LD. Specifically, since the first sheet layer 20A, the second sheet layer 20B, and the like are often folded back at the waist end portion 23, the number of laminated sheets at the waist end portion 23 is large, and portions other than the waist end portion 23 There is a tendency for the number of laminated layers to decrease.
  • the joining force of the side seal section 21 tends to become stronger in the portion where the number of laminated layers is large in the side seal section 21.
  • the bonding strength of the side seal portion 21 tends to be weak in the portion where the number of laminated layers is small. Therefore, in order to facilitate peeling of the side seal portion 21, it is important to facilitate peeling of the portion of the side seal portion 21 having a large number of laminated sheets.
  • the size of the joining hole 31 of the elastic sheet 30 is increased in the portion where the number of laminated side seal portions 21 is large, and the size of the joining hole 31 of the elastic sheet 30 is made small in the portion where the number of laminated side seal portions 21 is small. preferably.
  • the tearability of the entire side seal portion 21 can be enhanced.
  • the pants-type disposable wearing article according to the present invention may include some elastic sheets 30 in the side seal portions 21 . That is, although it is ideal that all the second joints 41 are provided inside the joint holes 31 , it is also assumed that some of the second joints 41 are actually provided outside the joint holes 31 . In such a case, the horn can be prevented from hitting the anvil indirectly and strongly, and the possibility of failure of the ultrasonic bonding apparatus due to the load being applied to the horn can be reduced.
  • the elastic sheet 30 is included in the side sealing portion 21, so that all products are not detected as defective as in Patent Document 9.
  • Patent Document 9 there is a possibility that the first sheet layer and the second sheet layer adjacent to the contracted portion of the elastic sheet may wrinkle and the texture may become poor, or the appearance may be poor and the texture may be poor. There is little fear that the wearer will have a preconceived notion that it is.
  • Patent Document 9 since no side non-stretchable areas are provided as in Patent Document 9, there is no reduction in the amount of stretch around the waist compared to pants-type disposable wearing articles, and for example, even an obese person can easily wear it. Moreover, it is possible to reduce the tightening feeling after wearing.
  • ⁇ "Front body” and “back body” refer to the front and rear portions of the pants-type disposable diaper, respectively, with respect to the center in the front-rear direction.
  • the crotch part means the front-rear direction range including the front-rear direction center of the pants-type disposable diaper, and means the front-rear direction range of the portion having the constricted part when the absorbent body has the constricted part.
  • ⁇ "Front-back direction means the direction (longitudinal direction) indicated by symbol LD in the figure
  • "width direction” means the direction (left-right direction) indicated by WD in the figure. are orthogonal.
  • ⁇ "MD direction” and "CD direction” mean the flow direction (MD direction) and the transverse direction (CD direction) perpendicular to this in the manufacturing equipment, and one of them is the front-back direction depending on the part of the product and the other is the width direction.
  • the MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric.
  • the fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. It can be determined by a simple measurement method for determining the orientation direction.
  • Maximum elongation means the maximum value of elongation in the stretching direction ED (in other words, the elongation in the unfolded state in which the first sheet layer and the second sheet layer are flatly unfolded without shrinkage or slack).
  • the length is expressed as a percentage when the natural length is taken as 100%.
  • ⁇ "Area ratio means the ratio of the target portion to the unit area, and is obtained by dividing the total area of the target portion (eg, the first joint portion 40) in the target region (eg, the elastic region 80) by the area of the target region.
  • the "area ratio" in the region having the elastic structure means the area ratio in the unfolded state. In a form in which a large number of target portions are provided at intervals, it is desirable to determine the area ratio by setting the target region to a size that includes 10 or more target portions.
  • Elongation rate means a value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
  • Methodsuke is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23 ⁇ 1° C., relative humidity 50 ⁇ 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.
  • the "thickness" of the absorber is measured by Ozaki Seisakusho Co., Ltd.'s thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measuring range 0 to 35 mm) or model K-4 (measuring range 0 to 50 mm)). Measure by placing the sample and the thickness gauge horizontally.
  • Test strength and "tensile elongation (breaking elongation)" are in accordance with JIS K7127: 1999 "Plastics - Test method for tensile properties -" except that the test piece is rectangular with a width of 35 mm and a length of 80 mm. means a value measured with an initial chuck interval (distance between gauge lines) of 50 mm and a tensile speed of 300 mm/min.
  • a tensile tester for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.
  • ⁇ "Elongational stress is determined by a tensile test in accordance with JIS K7127: 1999 "Plastics - Test method for tensile properties -" with an initial chuck interval (distance between gauge lines) of 50 mm and a tensile speed of 300 mm/min. , means the tensile stress (N/35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test subject. It is preferable that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more.
  • ⁇ "Unfolded state means a flat unfolded state without contraction or slack.
  • the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.
  • test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23 ⁇ 1°C, relative humidity 50 ⁇ 2%). do.
  • the present invention can be used for disposable diapers, sanitary napkins, disposable wearable articles for swimming and playing in the water, etc., as long as they are pants-type disposable wearable articles.
  • SYMBOLS 10 Inner body, 10B... Inner-outer fixing area, 11... Top sheet, 12... Liquid-impermeable sheet, 13... Absorbent body, 13N... Constricted part, 14... Packaging sheet, 17... Non-absorbent side part, 20... Exterior body , 20A first sheet layer 20B second sheet layer 20C folded portion 20X elastic sheet elastic structure 21 side seal portion 23 waist end portion 24 waist portion elastic member 25 contraction folds , 29... Leg circumference line, 30... Elastic sheet, 31... Joint hole, 31A... Joint hole formed in the first region (first joint hole), 31B... Joint hole formed in the second region (second joint hole) hole), 33... ventilation hole, 40... first joint, 40A...
  • first joint provided in the first region (first joint), 40B... first joint provided in the second region (Second one joint portion), 41 Second joint portion 51, 52 Non-bonded band 51 First non-bonded band 51d First direction 51s First interval 51w First width 52... Second non-bonded band 52d... Second direction 70... Intermediate non-stretchable area 71... Side non-stretchable area 80... Stretchable area 90... Three-dimensional gathers 93... Falling portion 94... Free portion 95... Gathered sheet 96 Gathered elastic member 200 Exterior belt-shaped body B Back body BR Imaginary boundary line between first region and second region ED Stretching direction F Front body L Intermediate part LD ... front-back direction, T ... waist circumference, WD ... width direction, W1 ...

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

Cet article vestimentaire jetable de type culotte comprend : un corps extérieur intégré s'étendant d'un corps avant à un corps arrière; un corps intérieur qui est fixé à une partie intermédiaire dans la direction de la largeur du corps extérieur et qui s'étend vers les côtés avant et arrière d'une partie d'entrejambe; et des parties d'étanchéité latérales au niveau desquelles les deux parties latérales du corps avant du corps extérieur et les deux parties latérales du corps arrière du corps extérieur sont liées par fusion l'une à l'autre. Le corps extérieur comporte : une première région positionnée sur les deux côtés dans la direction de la largeur du corps avant et les deux côtés dans la direction de la largeur du corps arrière; et une seconde région qui est positionnée plus près du centre dans la direction de la largeur que la première région, et se dilate et se contracte dans la direction de la largeur. Les parties d'étanchéité latérales sont incluses dans la première région. Le corps extérieur a une première couche de feuille et une seconde couche de feuille, et une feuille élastique disposée entre les première et seconde couches de feuille. La première couche de feuille et la seconde couche de feuille sont liées par l'intermédiaire de trous de liaison s'étendant à travers la feuille élastique dans un grand nombre de premières sections de liaison espacées les unes des autres. Les premières sections de liaison dans la première région sont plus grandes que les premières sections de liaison dans la seconde région.
PCT/JP2022/001054 2021-03-08 2022-01-14 Article vestimentaire jetable de type culotte et son procédé de production WO2022190620A1 (fr)

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JP2021036738A JP2022136910A (ja) 2021-03-08 2021-03-08 パンツタイプ使い捨て着用物品及びその製造方法
JP2021-036738 2021-03-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016189931A (ja) * 2015-03-31 2016-11-10 大王製紙株式会社 吸収性物品及びその製造方法
WO2018186318A1 (fr) * 2017-04-03 2018-10-11 株式会社光洋 Article absorbant et procédé de fabrication de l'article absorbant
JP2019092945A (ja) * 2017-11-24 2019-06-20 大王製紙株式会社 伸縮部材及びこの伸縮部材を有するパンツタイプ使い捨て着用物品
JP2019170831A (ja) * 2018-03-29 2019-10-10 大王製紙株式会社 パンツタイプ使い捨て着用物品
WO2020189178A1 (fr) * 2019-03-18 2020-09-24 大王製紙株式会社 Élément élastique et article portable jetable ayant l'élément élastique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016189931A (ja) * 2015-03-31 2016-11-10 大王製紙株式会社 吸収性物品及びその製造方法
WO2018186318A1 (fr) * 2017-04-03 2018-10-11 株式会社光洋 Article absorbant et procédé de fabrication de l'article absorbant
JP2019092945A (ja) * 2017-11-24 2019-06-20 大王製紙株式会社 伸縮部材及びこの伸縮部材を有するパンツタイプ使い捨て着用物品
JP2019170831A (ja) * 2018-03-29 2019-10-10 大王製紙株式会社 パンツタイプ使い捨て着用物品
WO2020189178A1 (fr) * 2019-03-18 2020-09-24 大王製紙株式会社 Élément élastique et article portable jetable ayant l'élément élastique

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