WO2019188563A1 - Structure expansible d'article à porter jetable, et article à porter jetable de type culotte ayant ladite structure expansible - Google Patents

Structure expansible d'article à porter jetable, et article à porter jetable de type culotte ayant ladite structure expansible Download PDF

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Publication number
WO2019188563A1
WO2019188563A1 PCT/JP2019/011375 JP2019011375W WO2019188563A1 WO 2019188563 A1 WO2019188563 A1 WO 2019188563A1 JP 2019011375 W JP2019011375 W JP 2019011375W WO 2019188563 A1 WO2019188563 A1 WO 2019188563A1
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Prior art keywords
nonwoven fabric
fabric layer
holes
orthogonal
sheet
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PCT/JP2019/011375
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English (en)
Japanese (ja)
Inventor
侑加 藤原
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大王製紙株式会社
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Publication of WO2019188563A1 publication Critical patent/WO2019188563A1/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
    • 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
    • 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
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin

Definitions

  • the present invention relates to a stretchable structure of a disposable wearing article and a pants-type disposable wearing article having the stretchable structure.
  • a stretchable structure in order to improve the fit of each part.
  • a disposable diaper of a pants type or a tape type it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part.
  • sanitary napkins are also widely used to provide longitudinal stretch structures called three-dimensional gathers and flat gathers (for example, patents). Reference 1 to 3).
  • a typical example of such a stretchable structure for a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and the second nonwoven fabric layer along the stretch direction and spaced from each other. It is to be prepared.
  • the first non-woven fabric layer and the second non-woven fabric layer form a planar stretchable region and play a role of covering and concealing the elastic member, and the elastic member built in between the first non-woven fabric layer and the second non-woven fabric layer is elastic stretch It plays the role of generating power for
  • the elastic member is fixed in the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends of the stretchable region in the stretched state.
  • the elastic member, the first nonwoven fabric layer, and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contraction force of the elastic member to include wrinkles (including ridges).
  • the elastic member is stretched not only in the natural length state but also in the stretched state (hereinafter also referred to simply as heel), and when stretched against the contraction force of the elastic member from this contracted state, Is expanded.
  • the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state having no wrinkles at the limit of elastic elongation, wrinkles are accompanied with the contraction of the elastic member, and wrinkles are most closely gathered in the natural length state.
  • an elastic member is extended over the whole expansion-contraction direction of an expansion-contraction area
  • region is a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer
  • the first nonwoven fabric layer and the second nonwoven fabric layer need to be contracted as the elastic member contracts. That is, it is necessary to join the first nonwoven fabric layer and the second nonwoven fabric layer and to fix the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer.
  • a hot melt adhesive is almost always selected.
  • the bonding form between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used.
  • the form performed by is also used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the passing position of the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer can be joined.
  • the first nonwoven fabric layer and the second nonwoven fabric layer are arranged in the direction perpendicular to the expansion / contraction direction and are intermittently arranged in the expansion / contraction direction, in addition to the combined use of fixing the elastic member to the nonwoven fabric layer. And a mode in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive that is intermittently arranged in a direction orthogonal to the stretching direction and that is substantially continuous in the stretching direction. It has been. (See Patent Documents 1 to 6)
  • Patent Documents 7 and 8 are bonded to the first nonwoven fabric layer and the second nonwoven fabric layer by an adhesive applied in the form of a spiral or stripe on the entire surface of one nonwoven fabric layer, and the first nonwoven fabric layer.
  • the elastic member is fixed to the second nonwoven fabric layer.
  • the formation of the holes in the first nonwoven fabric layer and the second nonwoven fabric layer is performed by melting, cutting out, or punching before or after joining the first nonwoven fabric layer and the second nonwoven fabric layer.
  • the adhesive pattern is preferably a striped pattern in which coating lines extending in a direction perpendicular to the expansion / contraction direction are repeatedly provided at intervals in the expansion / contraction direction. It is desirable that the width of the coating line be as narrow as possible.
  • the sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are bonded becomes a groove continuous in a direction orthogonal to the expansion / contraction direction, and the non-adhesive portion between the grooves
  • the 1 non-woven fabric layer and the second non-woven fabric layer bulge to the same extent in opposite directions (on both sides) to form wrinkles.
  • the portion between the ridges and the inner space of the ridges are continuous in the direction orthogonal to the expansion / contraction direction, not only is the air permeability in the direction orthogonal to the expansion / contraction direction excellent, but the appearance is also preferable due to the formation of aligned ridges. It will be a thing.
  • the adhesive pattern is striped. That is, in this case, since it is difficult to accurately match the position where the adhesive is applied and the position of the hole, a part of the adhesive applied line may overlap the hole row. If there is an overlap between the adhesive application line and the hole array, the first nonwoven fabric layer and the second nonwoven fabric layer are naturally not adhered to the portion of the adhesive application line that overlaps the hole. In other words, the sheet bonding portion formed at the position overlapping the row of holes not only reduces the bonding area, but also loses the position overlapping the hole and becomes a dotted line, or a concave missing portion at the edge of the bonding portion. Will be formed.
  • the heels rise from the edge of the sheet joint, so if there is a missing part in the sheet joint, the side edges of the heel will be uneven or partly merged with the next heel , The appearance of the cocoon may be deteriorated.
  • the adhesive portion is more easily peeled off than the area of the sheet joint portion simply decreases due to the tendency of stress concentration. And when peeling of such an adhesive part generate
  • the main problem of the present invention is to suppress the deterioration of the appearance of the wrinkles while adopting the striped adhesive pattern in the stretchable structure of the absorbent article using the perforated nonwoven fabric.
  • the stretchable structure of the disposable wearing article that has solved the above problems is as follows. ⁇ First aspect> Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction.
  • a plurality of elongated elastic members extending The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
  • the stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive,
  • At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
  • the array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
  • the hot melt adhesive is applied in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction,
  • the orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes;
  • the sheet-bonded portion by the hot-melt adhesive is formed in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction, so that good breathability and flexibility can be ensured. it can.
  • the sheet joint when the sheet joint is formed by applying a hot melt adhesive in a striped pattern that is spaced in the orthogonal direction and continuous in the orthogonal direction, the sheet is contracted to some extent including the natural length state. Then, the sheet joint portion becomes a groove continuous in a direction orthogonal to the expansion and contraction direction, and the first nonwoven fabric layer and the second nonwoven fabric layer bulge in opposite directions (on both sides) at the non-joint portion between the grooves. A cocoon is formed.
  • a portion to be a sheet joint portion is formed by overlapping some hot melt adhesive application lines and a row of holes.
  • the sheet joint portion becomes a dotted line that is interrupted via a long missing portion or a long concave shape at the edge of the sheet joint portion A large number of missing portions will be formed.
  • the omission of the sheet joint portion becomes large, large side irregularities are formed on the side edges of the ridges, and it is easy to partially merge with the adjacent ridges.
  • the gap between the holes in the row of holes is larger than the dimension of the holes in the orthogonal direction, even if a missing part is formed in some of the sheet joints, Since the ratio of the missing part occupied is less than half, the influence of the missing part on the shape of the ridge is smaller. Therefore, even if unevenness is formed on the side edge of the ridge or when it is partially merged with the adjacent ridge, the degree can be suppressed.
  • the orthogonal spacing of the holes in the array of holes is 3 to 20 times the orthogonal dimension of the holes;
  • the interval in the orthogonal direction of the holes in the row of holes can be determined as long as it is wider than the dimension in the orthogonal direction of the holes, but if it is 3 times or more as in this aspect, the missing portion (overlaps with the hole) of the sheet joint portion Even if irregularities are formed on the side edges of the ridges or partially merged with the adjacent ridges, they become almost inconspicuous. Moreover, when the space
  • the perforated nonwoven fabric is one in which a protruding portion is formed at the edge of the hole on the opposite nonwoven fabric layer side.
  • the elastic structure of the disposable wearing article according to any one of the first to third aspects.
  • the hole has a dimension in the stretch direction of 0.3 to 5.0 mm, a dimension in the orthogonal direction of 0.3 to 3.0 mm, The orthogonal spacing of the holes in the row is 2.5-10.0 mm; An interval in the stretch direction of the row is 1.0 to 5.0 mm; The dimension of the sheet joint in the stretching direction is 0.5 to 4 mm; The interval between the sheet joints in the stretching direction is 4 to 8 mm.
  • the elastic structure of the disposable wearing article according to any one of the first to fourth aspects.
  • the hole array of the perforated nonwoven fabric is a matrix in which a row of holes linearly arranged at a predetermined interval in the orthogonal direction repeats at a predetermined interval in the expansion / contraction direction,
  • the elastic structure of the disposable wearing article according to any one of the first to fifth aspects.
  • the perforated nonwoven fabric Since the perforated nonwoven fabric is easy to bend at the portion having holes, the perforated non-woven fabric tends to be particularly neatly arranged in a matrix arrangement as in this embodiment.
  • the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric
  • the opposite nonwoven fabric layer is the porous nonwoven fabric
  • the nonwoven fabric layer on the skin side By making the nonwoven fabric layer on the skin side a non-porous nonwoven fabric, it is possible to eliminate the influence of the pores on the touch. Moreover, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has a hole, the skin is not exposed at the time of wearing, and leakage through the hole can be prevented. In addition, when both the first nonwoven fabric layer and the second nonwoven fabric layer are perforated nonwoven fabrics, and there is a possibility that the holes and the holes overlap, the application line of the hot melt adhesive overlaps the portion where the holes and the holes overlap. Therefore, the hot melt adhesive may protrude into the holes and cause problems such as wearing feeling, and thus this embodiment is particularly preferable.
  • Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
  • the elastic structure of the disposable wearing article according to any one of the first to seventh aspects.
  • both the nonwoven fabric layers porous porous fabrics
  • higher air permeability can be obtained.
  • the hole of one perforated nonwoven fabric and the hole of the other perforated nonwoven fabric do not overlap, skin is not exposed at the time of mounting
  • the application line of the hot melt adhesive overlaps the portion where the holes and the holes overlap. Therefore, the hot melt adhesive may protrude into the holes and cause problems such as wearing feeling, and thus this embodiment is particularly preferable.
  • the first nonwoven fabric layer and the second nonwoven fabric layer which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction.
  • a plurality of elongated elastic members extending The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
  • the stretchable region has a sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are welded, At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
  • the array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction, The welding is performed in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction; The orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes; A stretchable structure for a disposable wearing article.
  • ⁇ Tenth aspect> An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part
  • the exterior body in at least one of the front body and the back body has a stretchable structure according to any one of the first to ninth aspects over at least a width direction range corresponding to the space between the side seal portions in a partial range in the front-rear direction.
  • a pants-type disposable wearing article characterized by that.
  • the above-described stretchable structure is suitable for an exterior body of a pants-type disposable wearing article.
  • FIG. 2 is a sectional view taken along line 2-2 of FIG.
  • FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1.
  • FIG. 8 (A) 4-4 sectional view of FIG. 8 and (b) 5-5 sectional view of FIG. It is a top view which shows the example of arrangement
  • 11A is a sectional view taken along the line 6-6 in FIG. 11
  • FIG. 11B is a sectional view taken along the line 7-7 in FIG. 11, and FIG. It is a top view which expands and shows the principal part of the exterior body of the expansion
  • A Cross-sectional view in the orthogonal direction in the expanded state
  • (b) Cross-sectional view in the expansion / contraction direction in the expanded state
  • (c) Cross-sectional view in the width direction in the contracted state. It is an expanded sectional view of a perforated nonwoven fabric.
  • (A) It is a front view which shows the principal part outer surface of the exterior body of a state of natural length
  • (b) It is a front view which shows the principal part outer surface of the exterior body of the state extended to some extent.
  • Hot melt adhesives can be applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral coating, Z coating, etc., or pattern coating (transfer of hot melt adhesive in relief printing). Can be applied. Instead of or together with this, at the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member, and the elastic member can be fixed to the adjacent member.
  • hot melt adhesives examples include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation.
  • a joining means for joining the constituent members means by material welding such as heat sealing or ultrasonic sealing can be used.
  • the pants-type disposable diaper shown in FIGS. 1 to 6 includes a front exterior body 12F constituting the front body F, a rear exterior body 12B constituting the rear body B, and a rear exterior body from the front exterior body 12F through the crotch portion.
  • An interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A.
  • the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200.
  • the portions surrounded by the side edges are leg openings LO through which the legs pass.
  • the interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body.
  • the symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X in the unfolded state. The full width of the diaper is shown.
  • the pants-type disposable diaper includes a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion that forms the leg opening LO.
  • An intermediate region L defined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction region having the side seal portion 12A of the rear body B).
  • the waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this.
  • the waist opening WO side is more waist-like than the waist opening WO side boundary.
  • the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200.
  • These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate.
  • the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm.
  • both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put.
  • the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.
  • the fixing of the inner body 200 to the outer bodies 12F and 12B is not particularly limited, and can be performed by, for example, a hot melt adhesive.
  • the inner surface of the exterior body 12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case and the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed.
  • the inner / outer joint part 201 that fixes the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. it can.
  • the interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function.
  • Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a rising gather 60 that extends from both sides of the interior body 200 so as to contact the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200.
  • the top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is.
  • synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
  • the nonwoven fabric may be manufactured by any processing.
  • processing method examples include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
  • spunlace method a spunlace method
  • thermal bond method a melt blown method
  • melt blown method a melt blown method
  • needle punch method an air through method
  • point bond method a point bond method.
  • the spunbond method and spunlace method are preferable.
  • the air-through method, point bond method, and thermal bond method are preferable processing methods. .
  • the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
  • the both sides of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.
  • the top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional deviation with respect to the back side member. desirable.
  • the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.
  • An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber.
  • This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out.
  • the intermediate sheet 40 can be omitted.
  • the intermediate sheet 40 examples include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper.
  • an air-through nonwoven fabric is preferable because it is bulky.
  • the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
  • Basis weight is preferably 20 ⁇ 80g / m 2, more preferably 25 ⁇ 60g / m 2.
  • the thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex.
  • the intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width.
  • the length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.
  • the intermediate sheet 40 may be fixed to a member adjacent to the back side by a bonding means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. desirable.
  • the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.
  • the material of the liquid-impermeable sheet 11 is not particularly limited.
  • a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified.
  • the liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness.
  • a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction.
  • an olefin resin such as polyethylene or polypropylene
  • non-woven fabric using microdenier fibers leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent
  • a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.
  • the liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 so that the side of the top sheet 30 of the absorbent element 50 It can also extend to both sides.
  • the width of this extended portion is suitably about 5 to 20 mm on the left and right.
  • the rising gather 60 is for preventing side leakage, extends across the entire front-rear direction LD along both side portions of the interior body 200, and stands up from the side of the interior body 200 to the front side.
  • the rising gather 60 in the illustrated example is such that the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely outward in the width direction from the intermediate portion, but is not limited thereto. However, it is possible to make appropriate changes such as a configuration in which the whole stands up in the center in the width direction.
  • the rising gather 60 in the illustrated example folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two.
  • a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof.
  • the base end portion (the end portion on the side opposite to the sheet folding portion in the width direction WD) of the rising gather 60 opposite to the front end portion is fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200.
  • a portion 65 other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65.
  • the main body portion 66 includes a root side portion extending toward the center in the width direction and a tip side portion that is folded back at the tip of the root side portion and extends outward in the width direction.
  • This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be used.
  • the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed.
  • the gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.
  • the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends of the main body portion 66 are fixed so as not to stand up.
  • the free portion 68 stands up so as to abut on the body side as indicated by an arrow in FIG.
  • the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion, so that the rising gather 60 abuts on the surface around the legs.
  • the fit is improved.
  • the absorption element 50 is not specifically limited, In this example, it has the absorber 56 and the packaging sheet 58 which wraps this absorber 56 whole.
  • the packaging sheet 58 can be omitted.
  • the absorber 56 can be formed of an aggregate of fibers.
  • a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
  • the absorber 56 may be rectangular, but as shown in FIG. 7, the absorber 56 includes a front end portion, a rear end portion, and a constricted portion 56 ⁇ / b> N that is located between these and narrower than the front end portion and the rear end portion.
  • the hourglass shape is preferred because the fit of the absorber 56 and the rising gather 60 around the legs is improved.
  • the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD.
  • Reference numeral 56X indicates the width of the absorber 56.
  • the absorber 56 can contain superabsorbent polymer particles in a part or all thereof.
  • Superabsorbent polymer particles include “powder” in addition to “particles”.
  • the superabsorbent polymer particles 54 those used in this type of disposable diaper can be used as they are.
  • the material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable.
  • Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used.
  • As the shape of the superabsorbent polymer particles a commonly used granular material is suitable, but other shapes can also be used.
  • the superabsorbent polymer particles those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.
  • the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.
  • the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m 2 .
  • tissue paper particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used.
  • the superabsorbent polymer particles be a sheet that does not escape.
  • a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like.
  • the basis weight is preferably 5 to 40 g / m 2 , particularly 10 to 30 g / m 2 .
  • the packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.
  • the exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B.
  • the front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type).
  • This separation distance 12d can be, for example, about 40 to 60% of the total length Y.
  • the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).
  • the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200.
  • the cover nonwoven fabric 20 covering the back surface of the interior body 200 is preferably provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200.
  • the material of the cover nonwoven fabric 20 is not particularly limited.
  • the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the outer package 12 (a porous nonwoven fabric layer or a nonporous nonwoven fabric layer described later) may be used. .
  • the front-rear direction range of the cover nonwoven fabric 20 is not particularly limited as long as it has portions overlapping the front exterior body 12F and the rear exterior body 12B, and extends in the front-rear direction LD over the entire front end to rear end of the interior body 200. As shown in FIG. 7, the intermediate position in the front-rear direction of the region where the rear exterior body 12B and the interior body 200 overlap from the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap. It may extend in the front-rear direction LD.
  • the exterior bodies 12F and 12B have a waistline portion that is a front-rear direction range corresponding to the waistline region T.
  • the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing.
  • the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B.
  • the lower edge of the collar cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that becomes.
  • the exterior bodies 12F and 12B have an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H as shown in FIGS.
  • one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention.
  • the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are formed by folding one sheet material so that the crease is located on the waist opening side, and as shown in FIG. These sheet materials can also be bonded together. Further, the innermost portion 12r of these sheet materials can be extended to the end of the interior body 200 on the waist opening WO side (see the example in FIG. 9). Further, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be formed of a sheet material that is partially different from the other portions.
  • constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths)
  • synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths)
  • regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be used as a mixture.
  • the constituent fibers are crimped fibers.
  • the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent) or hydrophobic fibers or water repellent fibers (water repellent fibers). (Including water-repellent fibers made water-repellent by an agent).
  • Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on fiber length, sheet formation method, fiber bonding method, and laminated structure. It is classified as non-woven fabric, point bond non-woven fabric, laminated non-woven fabric (SMS non-woven fabric with a melt-blown layer sandwiched between spunbond layers, SMMS non-woven fabric, etc.). Can do.
  • the fineness and basis weight of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H can be determined as appropriate, but in the normal case, they are preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m 2 , respectively.
  • At least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered.
  • the inner nonwoven fabric layer 12H on the skin side of the wearer is a non-porous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the influence on the touch of the holes 14 is eliminated. Can do.
  • the hole 14 is provided in only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented.
  • the inner nonwoven fabric layer 12H on the skin side of the wearer may be a perforated nonwoven fabric
  • the outer nonwoven fabric layer 12S may be a nonporous nonwoven fabric.
  • both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap.
  • a structure is also preferable. In this case, higher air permeability can be obtained by making both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H porous.
  • both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric are completely or partially. May overlap.
  • both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most cases (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other perforated nonwoven fabric are formed.
  • the hole 14 of the porous nonwoven fabric does not overlap, in some cases, the hole 14 of one porous nonwoven fabric and the hole 14 of the other porous nonwoven fabric may overlap.
  • each hole 14 has a long hole shape as shown in FIG. 10 (b), a perfect circle as shown in FIG. 10 (e), an ellipse, a triangle, and a rectangle as shown in FIGS. 10 (a) and 10 (d). , Polygons such as rhombuses, stars, clouds, etc. As shown in FIG. 10 (c), holes having different shapes may be mixed, but in that case, it is preferable that the dimensions in the expansion / contraction direction are substantially the same, and that all the holes have a single shape. preferable.
  • each hole 14 is not particularly limited, but the dimension 14L in the orthogonal direction XD (the dimension of the longest part) is preferably 0.3 to 3.0 mm, particularly preferably 0.4 to 1.5 mm.
  • the ED dimension (longest dimension) 14W is preferably 0.3 to 5.0 mm, particularly preferably 0.6 to 2.0 mm.
  • shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc.
  • the dimension in the longitudinal direction is preferably 1.2 to 2.5 times the dimension (longest dimension) in the direction perpendicular thereto.
  • the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.
  • each hole 14 may be determined as appropriate, but the area is preferably about 0.1 to 2.7 mm 2 (particularly 0.1 to 1.0 mm 2 ). It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).
  • the planar arrangement of the holes 14 can be appropriately determined as long as the rows of the holes 14 arranged at intervals in the direction orthogonal to the expansion / contraction direction ED are arranged at intervals in the expansion / contraction direction ED.
  • the holes 14 are arranged in such a manner that the rows of holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD have a predetermined interval in the expansion / contraction direction ED. It is preferable that the matrix is repeated.
  • the interval 14x in the expansion / contraction direction ED is shorter than the interval 14y in the orthogonal direction XD, and as shown in FIG.
  • the interval 14x in the expansion / contraction direction ED may be longer than the interval 14y in the orthogonal direction XD, as shown in FIG.
  • the rows of the holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD are spaced from each other in the expansion / contraction direction ED so that the positions in the orthogonal direction XD are shifted. It can be arranged in a line.
  • the example shown in FIG. 10B is a so-called zigzag (hexagonal lattice) arrangement in which the holes 14 are alternately arranged in the row of adjacent holes 14.
  • the orthogonal direction interval 14y and the expansion / contraction direction interval 14x of the holes 14 may be constant or may vary. Although the orthogonal direction interval 14y and the expansion / contraction direction interval 14x of the holes 14 can be determined as appropriate, considering air permeability, 14y is 2.5 to 10.0 mm, 14x is 1.0 to 5.0 mm, and particularly 14y is It is desirable that 3.0 to 5.0 mm and 14x are in the range of 1.0 to 2.0 mm.
  • the cross-sectional shape of the hole 14 is not particularly limited.
  • the hole 14 may be a punching type hole whose periphery is formed by a cut end of a fiber as shown in FIG. 16 (d).
  • 14 may be a non-punched hole 14 (the edge has a high fiber density) formed by having almost no cut ends of the fiber at the periphery of 14 and a pin inserted between the fibers and spread.
  • the punching type hole may be smaller as the diameter of the hole 14 goes to the middle in the thickness direction, or smaller as it goes to the one side in the thickness direction. .
  • the diameter of the hole 14 means a dimension in a direction passing through the center of gravity of the hole and orthogonal to the expansion / contraction direction (therefore, the diameter is a circle for a circle and the ellipse is a major axis).
  • the decrease in the diameter of the hole 14 in the thickness direction means that the diameter of the hole 14 continues to decrease over the entire thickness direction of the nonwoven fabric layer, and that the decrease in the diameter of the hole 14 almost disappears in the middle of the thickness direction. Is also included.
  • the non-punched hole 14 is such that the diameter of the hole 14 decreases from the pin insertion side toward the opposite side.
  • a fiber is pushed out to the edge of the hole 14 on the side opposite to the pin insertion side and pushed out to the side opposite to the pin insertion side.
  • the part (burr) 14e is formed, and the protrusion 14e is not formed on the pin insertion side, and the fiber is inserted into the edge of the hole 14 on the side opposite to the pin insertion side as shown in FIG.
  • the protrusion 14e pushed out to the opposite side is formed, and the pin insertion side includes the protrusion 14e formed by pushing out the fiber to the pin insertion side.
  • the protrusion 14 e has a substantially uniform height 14 h as shown in FIG. 16A, and the protrusion 14 e as shown in FIG. This includes a facing portion having the highest protruding height 14i and a facing portion facing in a direction perpendicular to the protruding portion and having the lowest protruding height 14j.
  • the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, the protruding portion 14e of a part or all of the holes 14 is formed only in a part of the circumferential direction of the hole 14. Also good.
  • the projecting heights 14h, 14i, and 14j (apparent height when no pressure is measured using an optical microscope) is preferably about 0.2 to 1.2 mm.
  • the highest protrusion height 14i in the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j.
  • the protruding height of the protruding portion 14 e may change in the circumferential direction of the hole 14.
  • a protrusion (burr) 14e is formed in which the protrusion height 14i of the opposing portion in the longitudinal direction of the hole 14 is higher than the protrusion height 14j of the opposing portion in the direction orthogonal to the longitudinal direction.
  • the protruding portion 14e of the hole 14 may have a fiber density that is lower than that of the surrounding portion, but is preferably the same or higher.
  • the fineness, basis weight and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but in the usual case, about 1.8 to 6.0 dtex, about 15 to 25 g / m 2 and about 0.1 to 1.3 mm, respectively. Is preferable.
  • the bending resistance in the MD direction (width direction) of the perforated nonwoven fabric is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-porous state before drilling, and 10 to 50 mm in the state after drilling.
  • the thickness is preferably 15 to 40 mm.
  • an elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and an expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the stretchable region A2, in the natural length state, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are contracted with the contraction of the elastic member and have a large number of wrinkles 80. Further, when the stretchable region A2 is extended in the width direction WD, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are extended to a predetermined extension rate that can be extended without wrinkles 80.
  • the elastic member 19 can be used in any shape, e.g., a thread shape, a string shape, and a belt shape, as long as it is elongated.
  • the elastic member 19 may be made of synthetic rubber or natural rubber.
  • the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends in the stretching direction ED in the stretchable region A2.
  • the fixing means for the elastic member 19 is not particularly limited, but it is preferable to use the hot melt adhesive 19H.
  • the hot melt adhesive 19H is intermittently applied to the outer peripheral surfaces of both ends of the elastic member 19 in the expansion / contraction direction ED by an application means such as a comb gun or a sure wrap nozzle, The elastic member 19 can be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.
  • the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H via the hot melt adhesive 19H only at both ends in the stretching direction ED in the stretchable region.
  • the hot melt adhesive 19H is applied to the arrangement positions of both ends of the elastic member 19 in the expansion / contraction direction ED on at least one of the opposing surfaces of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.
  • the elastic member 19 can also be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.
  • the hot-melt adhesive 19H may be continuous in the orthogonal direction XD as illustrated, or may be intermittently disposed in the orthogonal direction XD. Further, in these cases, the continuous portion of the hot melt adhesive 19H may extend over a plurality of elastic members.
  • the elastic member 19 that is, the stretchable region at the following site. That is, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the exterior bodies 12F and 12B. Attached. Moreover, about the 1 or several arrange
  • the waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber.
  • the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1.
  • the rubber thread 0mm about 2), 4 is preferably provided about 3 to 22 present at intervals of ⁇ 12 mm, which by extension ratio in the width direction WD of the waist portion W 150 to 400% especially about 220-320% Preferably there is.
  • the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.
  • a plurality of waist lower part elastic members 15 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist lower part U of the exterior bodies 12F and 12B. It has been.
  • the waist lower elastic member 15 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
  • the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1.
  • the rubber thread 0mm about 2), 1 ⁇ 15mm, especially 3 to is preferably provided about 5 to 30 yarns at intervals of 8 mm, which by 200 to 350% elongation modulus in the width direction WD of the waist lower portion U, especially It is preferably about 240 to 300%.
  • cover elastic members 16 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttock cover portion C of the rear exterior body 12B. ing.
  • the cover elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
  • the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1.0 mm. It is preferable to provide about 2 to 10 thread rubbers with an interval of 5 to 40 mm, particularly 5 to 20 mm, and the extension ratio of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % Is preferred.
  • a cover portion elastic member When providing an inguinal cover portion on the front exterior body 12F, a cover portion elastic member can be similarly provided.
  • Non-stretchable area When the elastic members 15 and 16 are provided in the front-rear direction range having the absorber 56 like the lower waist portion U and the buttock cover portion C in the illustrated example, a part or all of the elastic members 15 and 16 in the width direction WD of the absorber 56.
  • the intermediate in the width direction preferably including the entire inner / outer joint portion 201 including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1, and the width direction Both sides are taken as the stretchable area A2.
  • the waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction.
  • the stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and the elastic members 15 and 16 are at least both ends in the stretchable direction ED in the stretchable region A2.
  • the elastic members 15 and 16 are pressed and applied at one place in the middle of the width direction in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting almost the entire elastic members 15 and 16 finely by pressurization and heating, leaving the stretchability in the stretchable region A2 and killing the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG.
  • the non-stretchable region A1 has an outer nonwoven fabric in a state in which the uncut stretched region A2 is continuously cut from the elastic members 15 and 16 of the stretchable region A2 to the natural length alone as the unnecessary elastic member 18. In the latter case, it remains between the layer 12S and the inner nonwoven fabric layer 12H.
  • the cut residue continuous from the elastic members 15 and 16 in the elastic region A2 and the elastic members 15 and 16 in both elastic regions A2 are continuous.
  • the cut piece of the elastic member that is not left is left between the outer nonwoven fabric layer 12 ⁇ / b> S and the inner nonwoven fabric layer 12 ⁇ / b> H in a state where the cut piece of the elastic member is contracted to the natural length alone as an unnecessary elastic member.
  • the stretchable region A2 has a sheet joining portion 70 in which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via a hot melt adhesive 14H.
  • the agent 14H is applied in a striped pattern that is spaced in the expansion / contraction direction ED and continuous in the orthogonal direction XD.
  • seat junction part 70 by the hot-melt-adhesive 14H is formed at intervals in the expansion-contraction direction ED, air permeability and a softness
  • the sheet bonding portion 70 is formed by applying a hot melt adhesive 14H with a striped pattern continuous in the orthogonal direction XD with an interval in the expansion / contraction direction ED, including the natural length state
  • the sheet bonding portion 70 becomes a groove continuous in a direction perpendicular to the expansion / contraction direction ED, and the outer nonwoven fabric layer 12 ⁇ / b> S and the inner nonwoven fabric layer 12 ⁇ / b> H are formed at the non-bonded portion between the grooves.
  • a wrinkle is formed by bulging to the same extent in opposite directions (on both sides).
  • the hot melt adhesive 14 ⁇ / b> H may be continuous over the entire orthogonal direction XD of the stretchable region A ⁇ b> 2, but may be continuous only in a part of the range intersecting with the plurality of elastic members 19.
  • the outer nonwoven fabric is formed in a portion to be a sheet joint portion by overlapping a part of the coating line of the hot melt adhesive 14H and the row of the holes 14.
  • a missing portion where the layer 12S and the inner nonwoven fabric layer 12H are not joined is formed.
  • the sheet joining portion 70 becomes a dotted line shape that is intermittent through a long missing portion, A large number of long concave missing portions are formed at the edge of the sheet joining portion 70.
  • the side edges of the ridge 80 are also greatly uneven or partially merged with the adjacent ridge 80, so that it is difficult to obtain a straight and uniform appearance. .
  • the interval 14y in the orthogonal direction XD of the holes 14 in the row of holes 14 is larger than the dimension 14L in the orthogonal direction XD of the holes 14 as shown in the example of the drawing, a part of the sheet joining portion 70 has a missing portion. Even if it is formed, since the ratio of the missing portion in the orthogonal direction XD of the sheet joining portion 70 is less than half, the influence of the missing portion on the shape of the flange 80 can be smaller. Therefore, as shown in FIG. 17, even if irregularities are formed on the side edge of the ridge 80 or partially merged with the adjacent ridge 80, the extent can be suppressed.
  • the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 can be determined as long as it is wider than the dimension 14L of the holes 14 in the orthogonal direction XD, but is at least three times the dimension 14L of the holes 14 in the orthogonal direction XD. And even if unevenness is formed on the side edge of the collar 80 due to the missing part (the part overlapping the hole 14) of the sheet joining part 70, or it is partially combined with the adjacent collar 80, it is almost inconspicuous Become.
  • the interval 14y in the orthogonal direction XD of the holes 14 in the row of holes 14 exceeds 20 times the dimension 14L of the orthogonal direction XD of the holes 14, the number of the holes 14 per unit area decreases, and a perforated nonwoven fabric is used. The profit to do is poor.
  • a more preferable range is 3 to 10 times.
  • the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 is not less than the interval 19y in the orthogonal direction XD of the elastic member 19.
  • all the expansion / contraction areas A2 satisfy the size relationship of the interval 14y and the dimension 14L, but it is not necessary for all of the expansion / contraction areas A2 to satisfy the size relationship of the interval 14y and the dimension 14L.
  • the waist portion W does not satisfy the size relationship of the interval 14y and the size 14L, but may satisfy the size relationship of the interval 14y and the size 14L except for the waist portion W.
  • the relationship between the intervals 14y and 19y is the same, and may be filled with all of the stretchable region A2, or may not be filled with a part of the stretchable region A2.
  • the interval 14x in the expansion / contraction direction ED of the row of holes 14 can be determined as appropriate. However, if the interval 14x is less than the interval 70y in the expansion / contraction direction ED of the sheet joining portion 70, one or more holes are provided in each flange 80 as illustrated. 14 exists, and the air permeability between the space between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H and the outside of each ridge 80 is preferable.
  • the interval in the expansion / contraction direction ED of the row of holes 14 is reduced in this way, the probability that the application line of the hot melt adhesive 14H overlaps with the row of holes 14 increases, but even in that case, as described above.
  • the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 is wider than the dimension 14L in the orthogonal direction XD of the holes 14, the shape of the flange 80 can be prevented from being deformed.
  • the cross-sectional structure of the hole 14 is not particularly limited, but when the protruding portion 14e is formed at the edge of the hole 14 on the opposite nonwoven fabric layer side, the hot melt adhesive 14H is applied.
  • the portion including the protruding portion 14e at the edge of the hole 14 is adhered by the hot melt adhesive 14H, so that the bite of the hot melt adhesive 14H becomes good, and the protruding portion 14e.
  • Adhesive strength is higher than in the case of not having.
  • the hot melt adhesive 14H exposed from the hole 14 when the surface opposite to the opposing nonwoven fabric is touched by hand is in hand. It also has the advantage of being difficult to touch.
  • both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and there is a possibility that the holes 14 and 14 overlap, the hot melt adhesive 14H is applied to the portion where the holes 14 and 14 overlap.
  • the hot melt adhesive 14H protrudes into the holes 14 and may cause problems such as wearing feeling. Therefore, as shown in FIGS. 11 and 12, the inner nonwoven fabric layer 12H on the skin side of the wearer is a nonporous nonwoven fabric, and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, as shown in FIGS.
  • both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric do not overlap.
  • the arrangement of the holes 14 is not limited, but the perforated nonwoven fabric is easy to bend at the portion having the holes 14, and thus affects the shape of the ridge 80. Therefore, when the holes 14 are arranged in a matrix in which rows of holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD are repeated at a predetermined interval in the expansion / contraction direction ED, in particular, the ridge 80 is arranged in the orthogonal direction XD. It is preferable because it extends straight along and tends to be neatly arranged.
  • seat junction part 70 can be determined suitably, it is especially preferable in it being in the following ranges. That is, when the sheet bonding portion 70 has a missing portion, the bonded portion is more easily peeled off than the area of the sheet bonding portion 70 is simply reduced due to the tendency of stress concentration. And when peeling of such an adhesive part generate
  • seat junction part 70 can also be provided only in the expansion-contraction area
  • the sheet joining portion 70 of the above example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot melt adhesive 14H, but is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. There may be. That is, at the time of forming the sheet joining portion 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be welded in a striped pattern that is spaced in the expansion / contraction direction ED and continuous in the orthogonal direction XD. In this case, the elastic member 19, the outer nonwoven fabric layer 12S, and the inner nonwoven fabric layer 12H may be welded or not welded at the passing position of the elastic member 19.
  • the melted portions of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer. At least one of 12H is continuous in the orthogonal direction XD.
  • the front-rear direction means the direction (vertical direction) indicated by the symbol LD in the figure
  • width direction means the direction indicated by WD (left-right direction) in the figure, Are orthogonal.
  • -"MD direction” and “CD direction” mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular thereto, and either one is the front-rear direction, and the other Is the width direction.
  • the MD direction of the 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. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
  • Center for a closed planar shape means the center of gravity in the case of a figure that does not have a center.
  • -“Area ratio” means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, non-woven fabric) by the area of the target region. is there.
  • the target region In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio.
  • the area ratio of the holes can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation, with the measurement condition set to 20 times. (1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 ⁇ 6.
  • Elongation rate means a value when the natural length is 100%.
  • an expansion rate of 200% is synonymous with an expansion ratio of 2 times.
  • ⁇ “Weighing” is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ⁇ 1 ° C., relative humidity 50 ⁇ 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm ⁇ 100 mm) is used to cut a sample having a size of 100 mm ⁇ 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.
  • Thickness is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm 2 and pressure area: 2 cm 2 .
  • “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”.
  • the value of the porous nonwoven fabric before punching is the same as the non-porous nonwoven fabric (fiber composition, fineness, basis weight, thickness, etc.).
  • the water absorption rate is the "time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .
  • Unfolded state means a state of being flattened without contraction or slack.
  • the dimensions of each part mean dimensions in the expanded state, not the natural length state.
  • test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ⁇ 1 ° C, relative humidity 50 ⁇ 2%). To do.
  • the present invention can be used for general disposable wearing articles such as pants-type disposable diapers and tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins and the like.
  • SYMBOLS 11 Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner nonwoven fabric layer, 12S ... Outer nonwoven fabric layer, 14 ... Hole, 14e ... Projection, 18 ... unnecessary elastic member, 19 ... elastic member, 14H, 19H ... hot melt adhesive, 20 ... cover nonwoven, 200 ... interior body, 201 ... inner / outer joint, 30 ... top sheet, 40 ... intermediate sheet, 50 DESCRIPTION OF SYMBOLS ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering gather, 62 ...

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  • Health & Medical Sciences (AREA)
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  • 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)
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  • Dermatology (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

Le problème décrit par la présente invention est d'empêcher la détérioration de l'apparition de plis tout en utilisant un motif de liaison à bandes dans une structure expansible d'un article absorbant dans lequel un tissu non tissé perforé est utilisé. la solution selon l'invention porte sur : une pluralité d'éléments élastiques 19 minces s'étendant le long d'une direction d'expansion ED, les éléments élastiques 19 étant disposés à des intervalles dans une direction orthogonale XD orthogonale à la direction d'expansion ED entre une couche de tissu non tissé externe 12S et une couche de tissu non tissé interne 12H; au moins l'une de la couche de tissu non tissé externe 12S et de la couche de tissu non tissé interne 12H étant un tissu non tissé perforé dans lequel des trous 14 qui pénètrent le long de la direction d'épaisseur sont agencés; l'agencement des trous 14 étant tel que les rangées de trous 14 alignés dans la direction orthogonale XD sont alignées à intervalles dans la direction d'expansion ED; un adhésif thermofusible 14H étant appliqué selon un motif à bandes à des intervalles dans la direction d'expansion ED, le motif à bandes étant continu dans la direction orthogonale XD; et l'espacement 14y de direction orthogonale XD des trous 14 dans les rangées de trous 14 étant plus large que la dimension14L de direction orthogonale XD des trous 14.
PCT/JP2019/011375 2018-03-27 2019-03-19 Structure expansible d'article à porter jetable, et article à porter jetable de type culotte ayant ladite structure expansible WO2019188563A1 (fr)

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JP2018060910A JP6495506B1 (ja) 2018-03-27 2018-03-27 使い捨て着用物品の伸縮構造、及びこの伸縮構造を有するパンツタイプ使い捨て着用物品
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JP7326013B2 (ja) * 2019-04-26 2023-08-15 ユニ・チャーム株式会社 吸収性物品
CN113905702B (zh) * 2019-06-04 2022-09-09 花王株式会社 伸缩性片和具有该伸缩性片的吸收性物品
JP7026166B2 (ja) * 2019-06-04 2022-02-25 花王株式会社 伸縮性シート、及び該伸縮性シートを備えた吸収性物品

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Publication number Priority date Publication date Assignee Title
JP2014188189A (ja) * 2013-03-27 2014-10-06 Daio Paper Corp 吸収性物品
JP2017217319A (ja) * 2016-06-09 2017-12-14 大王製紙株式会社 吸収性物品

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014188189A (ja) * 2013-03-27 2014-10-06 Daio Paper Corp 吸収性物品
JP2017217319A (ja) * 2016-06-09 2017-12-14 大王製紙株式会社 吸収性物品

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