WO2008041639A1 - Couche en papier, procédé destiné à former une partie extensible d'un article absorbant, et dispositif destiné à former la partie extensible - Google Patents

Couche en papier, procédé destiné à former une partie extensible d'un article absorbant, et dispositif destiné à former la partie extensible Download PDF

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Publication number
WO2008041639A1
WO2008041639A1 PCT/JP2007/069010 JP2007069010W WO2008041639A1 WO 2008041639 A1 WO2008041639 A1 WO 2008041639A1 JP 2007069010 W JP2007069010 W JP 2007069010W WO 2008041639 A1 WO2008041639 A1 WO 2008041639A1
Authority
WO
WIPO (PCT)
Prior art keywords
elastic
sheet
stretchable
elastic member
fixed
Prior art date
Application number
PCT/JP2007/069010
Other languages
English (en)
Japanese (ja)
Inventor
Hiroyuki Yano
Sadanao Manabe
Original Assignee
Daio Paper Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007181589A external-priority patent/JP5124187B2/ja
Priority claimed from JP2007181590A external-priority patent/JP5124188B2/ja
Application filed by Daio Paper Corporation filed Critical Daio Paper Corporation
Publication of WO2008041639A1 publication Critical patent/WO2008041639A1/fr

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Classifications

    • 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
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0046—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Definitions

  • the present invention relates to a paper diaper, and more particularly to a pants-type paper diaper having an expansion / contraction part in which an elastic expansion / contraction member is disposed on a waist part.
  • the present invention also relates to a method for forming a stretchable part and an apparatus for forming the same in an absorbent article.
  • a pants-type disposable diaper that is an absorbent article
  • a fitting function for example, And Patent Document 1
  • This shearing S is made by sandwiching elastic elastic members 2, 2,... Such as rubber thread with an exterior sheet 1 formed by laminating and fixing two or three air permeable water-repellent nonwoven fabrics.
  • the elastic elastic members 2, 2, ... and the exterior sheet 1 are intermittently fixed with an adhesive such as hot melt while the elastic elastic members 2, 2, ... are contracted.
  • WO indicates a waste opening
  • LO indicates a redder opening!
  • an ambinole roll (not shown) that is intermittently arranged and is constituted by a projection that serves as an adhesive surface, and a heat-sealing device (not shown) that is arranged at a position facing the ambinore roll.
  • the sheet 1 is continuously supplied with the elastic elastic members 2, 2,... Sandwiched between them, and the exterior sheet 1 and the elastic elastic members 2, 2,. It has been introduced.
  • Patent Document 1 JP 2002-172132 A
  • Patent Document 2 JP 2004-330777 A Disclosure of the invention
  • an adhesive other than hot melt is not preferable because a volatile solvent is harmful to the human body or has fluidity at room temperature and cannot exert sufficient adhesive strength.
  • a stretchable part is formed by fixing an elastic stretchable member and a nonwoven fabric (exterior sheet) with an adhesive as a product of a paper diaper, there is a problem that the breathability and softness of the stretchable part are lost.
  • the method of fixing in the pinched state of the invention described in Patent Document 2 has a problem that the elastic elastic member such as rubber is deteriorated and the strength and elasticity of the elastic elastic member are lowered.
  • the main problem of the present invention is to improve the breathability, softness, stretchability, etc. by fixing the elastic stretchable member and the exterior sheet to the stretchable part without using any adhesive!
  • the purpose is to provide disposable diapers.
  • Another object is to provide a stretchable portion forming method and equipment for fixing an elastic stretchable member and a sheet without using an adhesive.
  • the present invention that has solved the above problems is as follows.
  • An exterior sheet having an inner layer and an outer layer, and an absorption part that is provided on the body side of the exterior sheet and absorbs and holds the object,
  • a plurality of elastic stretchable parts arranged in parallel between the inner layer and the outer layer in the waist part
  • a paper diaper having an elastic part sandwiched between materials
  • the stretchable portion is formed by welding the inner layer and the outer layer at a predetermined interval in the vicinity of both end portions in the width direction of the elastic stretchable member in a state where a tensile force is applied to the elastic stretchable member.
  • the elastic member is configured to be fixed to the exterior sheet by frictional force with the exterior sheet.
  • a paper diaper characterized by the above.
  • An exterior sheet having an inner layer and an outer layer, and an absorption part that is provided on the body side of the exterior sheet and absorbs and holds the object,
  • a paper diaper having a stretchable part in which a plurality of elastic stretchable members arranged in parallel are sandwiched between the inner layer and the outer layer in the waistline part,
  • the stretchable portion is formed by welding both ends of the elastic stretchable member in the width direction and the inner layer and the outer layer at a predetermined interval in a state where a tensile force is applied to the elastic stretchable member.
  • the elastic stretchable member is configured to be fixed to the exterior sheet by the frictional force with the exterior sheet and the adhesive force at the end in the width direction of the elastic stretchable member.
  • the disposable diaper according to claim 1 or 2 wherein the elastic elastic member is formed in a net shape by a plurality of elastic yarns arranged in parallel and a plurality of elastic yarns orthogonal to the elastic yarns.
  • the stretchable portion is elastic when the tensile force is applied to the elastic stretchable member (stretched state) and the inner layer and the outer layer are welded at a predetermined interval in the vicinity of both ends in the width direction of the elastic stretchable member.
  • the welding can be ultrasonic welding or heat welding. However, it is more preferable to use ultrasonic welding because the elastic expansion member is less affected by heat and pressure than the thermal welding on the periphery of the exterior sheet.
  • the width direction of the elastic elastic member By welding the both end portions and the inner layer and the outer layer at a predetermined interval, the elastic stretchable member is attached to the exterior by the frictional force with the exterior sheet and the adhesive force at the end in the width direction of the elastic stretchable member.
  • the elastic stretchable member is more firmly fixed by the adhesive force at the end in the width direction of the elastic stretchable member in addition to the frictional force with the exterior sheet. Note that the adhesive is only bonded to the end in the width direction of the elastic elastic member, so there is no risk of deterioration or cutting of the elastic elastic member.
  • the mechanism in which the elastic elastic member is fixed by the frictional force with the exterior sheet is such that a tensile force is applied to the elastic elastic member, and the inner layer and the outer side in the vicinity of both ends in the width direction of the elastic elastic member.
  • the elastic elastic member a member configured in a net shape by a plurality of elastic yarns arranged in parallel and a plurality of elastic yarns orthogonal to these may be used.
  • the back elastic elastic member and / or the abdominal elastic elastic member is cut at a portion of the exterior sheet that overlaps the absorbing portion, or is provided, or is provided.
  • the disposable diaper of any one of thru
  • the breathability and softness of the stretchable part are further improved.
  • the back elastic stretch member and / or the abdomen elastic stretch member is cut at the portion of the exterior sheet that overlaps the absorbent portion, or the force that is provided or is provided. By doing so, the contraction force acting on the absorption part is weakened or eliminated, and absorption inhibition due to contraction of the absorption part is less likely to occur.
  • At least one end of the elastic elastic member in the longitudinal direction is welded and fixed between the elastic elastic member and the inner layer and the outer layer of the exterior sheet by a welding line that vertically cuts the elastic elastic member arranged in parallel.
  • a method for forming a stretchable part of an absorbent article wherein the elastic stretchable member is fixed by intermittently bonding the inner sheet and the outer sheet in a supply direction,
  • the inner sheet and the outer sheet are intermittently welded in the vicinity of both ends in the width direction of the elastic elastic member, and the elastic elastic member is fixed to the sheet.
  • a method for forming a stretchable part characterized in that.
  • a method for forming a stretchable part of an absorbent article wherein the elastic stretchable member is fixed by intermittently bonding the inner sheet and the outer sheet in a supply direction,
  • both ends of the elastic elastic member in the width direction are intermittently welded to the inner sheet and the outer sheet to fix the elastic elastic member to the sheet.
  • a method for forming the stretchable portion characterized by the above.
  • the inner sheet and the outer sheet are intermittently welded in the vicinity of both ends in the width direction of the elastic elastic member, and the elastic elastic member is fixed to the sheet.
  • the load is removed (no tension)
  • the cross-sectional outer diameter of the elastic expansion / contraction member increases, and a pressing force is applied so that the width direction of the elastic expansion / contraction member is sandwiched from both sides by the welded portion between the inner sheet and the outer sheet. .
  • the elastic elastic member is fixed only by the frictional force with the sheet without fixing the elastic elastic member with the adhesive, the force S can be prevented from being deteriorated by the adhesive.
  • the elastic elastic member is not bonded, it is possible to form an expansion / contraction part in which air permeability and softness are ensured.
  • the welding can be ultrasonic welding or heat welding. However, it is more preferable to use ultrasonic welding because the elastic stretch member has less influence of heat and pressure on the periphery of the sheet than ultrasonic welding.
  • the both ends of the elastic elastic member in the width direction are intermittently welded to the inner sheet and the outer sheet to fix the elastic elastic member.
  • the elastic expansion / contraction member is more firmly fixed by the adhesive force at the end in the width direction of the elastic expansion / contraction member. Note that there is no risk of deterioration or cutting of the elastic expansion / contraction member because the bonding is only at the end in the width direction of the elastic expansion / contraction member.
  • the apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
  • protrusions serving as adhesive surfaces are formed, [0042] These protrusions are in a lattice shape and are configured to have substantially the same length as the cross-sectional outer diameter of the elastic elastic member in a state in which the space force between the protrusions in the width direction of the anvil roll and the tension is applied.
  • the apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
  • protrusions are staggered, and the distance in the width direction between the protrusions adjacent to each other in the oblique direction with respect to the rotation direction of the anvil roll is equal to the outer diameter of the cross section of the elastic elastic member in a state where a tensile force is applied. Composed of approximately the same length,
  • a stretchable part forming apparatus characterized by the above.
  • the anvil roll On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces, and these protrusions are in a lattice shape, and the spacing between the protrusions in the width direction of the anvil roll and the elastic elastic member in a state where a tensile force is applied
  • the outer and outer sheets of the continuous sheet are narrow in a state where the entire elastic elastic member or the main part is stored in the groove between the protrusions of the anvil roll. It is pressed and ultrasonically welded by the projection and horn. As a result, when the entire elastic expansion / contraction member is in the groove, the elastic expansion / contraction member is fixed only by the frictional force with the sheet without using an adhesive.
  • a plurality of protrusions serving as adhesive surfaces are formed on the outer peripheral surface of the anvil roll.
  • the staggered projections that are adjacent to each other in the diagonal direction with respect to the rotation direction of the anvil roll have a width in the width direction that is approximately the same as the cross-sectional outer diameter of the elastic elastic member in the state in which a tensile force is applied.
  • the same effect as described above can be obtained.
  • the paper diaper of the present invention has the advantage that the elastic stretchable member and the exterior sheet can be fixed without using an adhesive in the stretchable portion, and the air permeability, softness, stretchability, etc. can be improved. Brought about.
  • the stretchable part can fix the elastic stretchable member and the sheet without using an adhesive.
  • the pants-type disposable diaper 10 shown in FIGS. 1 to 5 includes an exterior sheet 12 that constitutes an exterior part, and an absorbent part 20 that is fixed to the body side (inner surface side).
  • the absorption part 20 is a part that receives and absorbs excrement such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later), and the exterior sheet 12 is used for supporting the absorption part 20 to the wearer.
  • the exterior sheet 12 has a front end side portion W, a rear end side portion W, and an intermediate portion L between them, and the front end side portion W and the rear end side portion W are formed as a waistline portion along the waistline of the adherend.
  • Each side edge of the intermediate portion L is formed as a leg circumference edge 12E that is constricted along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is placed.
  • the exterior sheet 12 has a substantially hourglass shape as a whole.
  • the absorbing portion 20 has a force to take an arbitrary shape, a force that can be applied, and a rectangular shape in the illustrated form.
  • the intermediate portion L of the exterior sheet 12 may be composed of only the front end side portion W and the rear end side portion W which are not essential.
  • the exterior sheet 12 has the absorbent portion 20 installed and fixed at a predetermined position, and the front and rear end portions thereof are folded and fixed onto the front end portion and the rear end portion of the absorbent portion 20. Folded back and forth so that the ventral side 12 F and the dorsal side 12B overlap, and the joint areas 12A on the both sides of the ventral side 12F and the dorsal side 12B of the exterior sheet 12 are heat-sealed with hook material, buttons, fasteners, etc. Joined.
  • the pant-type use / removal diaper having the waist opening WO and the pair of redder openings LO having the structure shown in FIG.
  • the force S in which the width of the intermediate portion of the absorber 20 in the front-rear direction (longitudinal direction, ie, the vertical direction in FIG. 2) is longer than the width connecting the peripheral edges of the outer sheet 12 is shown.
  • the relationship may be reversed or the same width.
  • the exterior sheet 12 is elastic between the breathable outer layer 12S and the breathable inner layer 12H in the front end side portion W and the rear end side portion W of the waistline portion.
  • the stretching members 12C, 12C,... are sandwiched in the stretched state, and in this state, both layers 12S, 12H are fixed by ultrasonic welding or heat welding. As a result, the shearing S as the stretchable part is formed in the waist part.
  • the elastic stretchable member 12C is a force that is fixed to the exterior sheet 12 only by the frictional force with the exterior sheet 12, or the frictional force and the elastic stretchable member.
  • an adhesive such as hot melt may be used in a portion where the elastic elastic members 12C, 12C,... Are not provided, but it is preferable to fix in this portion also by ultrasonic welding or heat welding! /.
  • the ratio of the area of the welded portion to the total area in the portion where the elastic elastic members 12C, 12C, ... are not provided is preferably 20% or less, more preferably 10% or less. preferable. Also, in order to maintain the bonding strength between the outer layer 12S and the inner layer 12H, the area ratio of the welded portion is preferably 2% or more.
  • the outer layer 12S and the inner layer 12H of the exterior sheet 12 it is preferable to use a water-repellent non-woven fabric from the viewpoint of touch and waterproofness as long as it is a breathable material without particular limitation.
  • Each of the outer layer 12S and the inner layer 12H may be formed by laminating a plurality of materials.
  • the nonwoven fabric for example, a polypropylene resin (PP), a polyethylene resin (PE), a polyethylene terephthalate resin (PET), or a composite of these can be used.
  • a film made of polyethylene resin or the like may be sandwiched between the layers of the nonwoven fabric.
  • Each thickness of the outer layer 12S and the inner layer 12H is preferably a force S that can be determined as appropriate, and the thickness of the outer layer 12S is preferably equal to or greater than the thickness of the inner layer 12H. It is preferable that the outer layer 12S and the inner layer 12H each have a basis weight in the range of 5 to 30 g / m 2 . Further, the thickness of the outer layer 12S is preferably 5 mm or less, and the thickness of the inner layer 12H is preferably 1 mm or less.
  • the elastic elastic member 12C a known elastic yarn can be used as long as it has elastic properties and can be fixed in tension with the surrounding nonwoven fabric.
  • Materials include natural rubber, polyurethane, block polyether amide, block polyether ester, polyurethane urea, elastic polyolefin, thermoplastic styrene butadiene styrene (SBS), styrene isoprene styrene, styrene ethylene / propylene styrene, styrene ethylene butadiene.
  • SEBS Styrene
  • hydrogenated styrene-butadiene rubbers and elastomers based on mixtures of these with other polymers such as polystyrene or polyolefins can be used.
  • Elastic yarns from segmented polyester or polyether urethane urea can also be used.
  • the thickness of the elastic elastic member 12C can be arbitrarily set.
  • the cross-sectional shape is not limited to a circle, but can be freely selected from an ellipse, a rectangle, and other geometric shapes.
  • the elastic elastic member 12C is not limited to a thread-like member, and although not shown, a wide ribbon-like member may be used.
  • a ribbon it is preferable that both end portions in the width direction are welded to the sheet together with the inner and outer sheets.
  • the orthogonal elastic yarn and the welded portion may be separated. 1S If the welded portion is welded not only to both ends in the width direction of the elastic yarn but also to the center, the elastic yarn may break or the welded portion may become hard. This is not preferable.
  • the elastic expansion / contraction member 12C itself hits the lower waist region even if the contraction force of the elastic expansion / contraction member 12C itself is weak, so that the product is suitable for the wearer. To fit.
  • the dorsal side and the stomach It is also a preferable form to cut the side elastic elastic members 12C, 12C,. Instead, it is also possible to adopt a form in which the back and ventral elastic elastic members 12C, 12C,...
  • this cutting method as disclosed in Japanese Patent Laid-Open No. 2002-178428, a plurality of points may be cut at a predetermined interval in the width direction, or only one point may be cut. In this way, if the elastic elastic member 12C is discontinuous at the portion overlapping the absorber 56, the contraction force acting on the absorber 56 is weakened or eliminated, and absorption inhibition due to the contraction of the absorber 56 is performed.
  • the elastic elastic member 12C is discontinuous, only a part of the dorsal or ventral elastic elastic member 12C is discontinuous, or a combination thereof Appropriate changes can be made, such as discontinuity of only a part of the elastic stretch member 12C on either the back side or the ventral side.
  • the elastic stretchable member 12C when the elastic stretchable member 12C is made discontinuous at the portion overlapping the absorber 56, the narrower stretchable portion prevents the slippage at the time of wearing, so a high stretch rate is achieved. It is preferable to fix the elastic elastic member 12C. Specifically, the elastic stretch member 12 C preferably has an elongation rate of 250% or more, and particularly preferably 270% or more. On the other hand, when the elastic stretchable member 12C is not discontinuous in the portion overlapping the absorber 56, it is preferable that the stretch rate of the elastic stretchable member 12C is about 150 to 250%. It is not preferable because it becomes too much and the wearer feels uncomfortable.
  • the elastic elastic member 12C when the elastic elastic member 12C is fixed at a high extension rate, particularly in an extended state of 250% or more, and a discontinuous portion is provided by cutting or the like, the elastic elastic member 12C is strongly contracted, so that the elastic elastic member 12C There is a possibility that pull-in (a phenomenon in which the elastic elastic member 2 contracts while shifting without being fixed by the sheets 1A and 1B) at the end of the discontinuous portion side may occur. Such pull-in progresses gradually with long-term wearing, and the tightening around the waist loosens, causing the diaper to slip off. In the past, a large amount of adhesive was used to prevent this phenomenon, and the texture was likely to deteriorate.
  • pull-in a phenomenon in which the elastic elastic member 2 contracts while shifting without being fixed by the sheets 1A and 1B
  • the elastic stretch member 12C has a high elongation rate, particularly at an elongation rate of 300% or more, the elastic stretch member 12C hardly occurs and the amount of adhesive used is small. By drastically reducing, it becomes excellent in texture and breathability. If the friction resistance of the outer layer 12S and the inner layer 12H is low and the elongation rate of the elastic elastic member 12C is high, a force that may cause retraction even with the fixing structure disclosed in the present application. By using a small amount of adhesive in combination, it is possible to prevent pull-in with almost no loss of texture and air permeability.
  • the outer layer 12S has almost all the force S except the front and rear edges of the front and rear direction intermediate portion L in the outer sheet 12 except for the portion where the elastic elastic member 12C is disposed. It is good also as the permeability improvement part 12P which does not have the inner layer 12H and the elastic elastic member 12C.
  • the inner layer 12H does not overlap the force inner layers 12H and 12H that are individually provided on the front end side portion W and the rear end side portion W of the exterior sheet 12, respectively.
  • the air permeability in the crotch portion and the portion near the crotch where it is easily sultry is drastically improved, and sultry can be prevented.
  • the softness and strength are improved.
  • the elastic elastic member 12C is provided over the entire waist region W, so that it is possible to prevent stuffiness without deteriorating the fit.
  • the outer layer 12S in 12P may be omitted, and the exterior sheet 12 may not be provided in the middle portion L in the front-rear direction.
  • the length of the permeability improving portion 12P in the front-rear direction is preferably 30% or more, particularly 35-65% or more of the front-rear direction length of the article. Further, in terms of the area ratio of the portion that overlaps the back surface of the absorbing portion 20, the transparency improving portion 12P is configured to overlap 30% or more, particularly 35 to 50%, with respect to the entire back surface of the absorbing portion 20. preferable. From the viewpoint of improving air permeability, the larger the upper permeability 12P, the better. Will lose the fit.
  • the absorbent portion 20 it is possible to use a member provided with a top sheet 30 made of a nonwoven fabric or the like and an absorbent element 50, for example, through which body fluid passes, in order from the use surface side.
  • a body fluid impermeable sheet (also called a back sheet) 70 force S is provided on the back side of the absorbent element 50.
  • the back side of the body fluid impermeable sheet 70 is joined to the body side surface of the exterior sheet 12.
  • An intermediate sheet (also referred to as a second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the body fluid that has passed through the top sheet 30 to the absorbent element 50.
  • barrier force hose 60, 60 standing on both sides of the absorption part 20 in order to prevent excrement from leaking on both sides of the absorption part 20.
  • the top sheet 30 has a property of permeating body fluid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this body fluid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, it is possible to use polypropylene resin (PP), polyethylene resin (PE), polyethylene terephthalate resin (PET), or a combination of these as described above.
  • the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as the spunlace method, the spunbond method, the thermal bond method, the melt blown method, and the needle punch method. For example, if you want flexibility and drapeability, the spunbond method and spunlace method are bulky and soft, and if you want bulkiness and softness, it is an air-through method, point bond method, thermal bond strength S, and a preferred processing method. .
  • the top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.
  • intermediate sheet In order to quickly transfer the body fluid that has passed through the top sheet 30 to the absorbent body, it is possible to install an intermediate sheet 40 that is faster than the top sheet 30 and that is normally referred to as a “second sheet”. This intermediate sheet 40 prevents the “reversal” phenomenon of the absorbed body fluid from the absorbent body by moving the body fluid quickly to the absorbent body to enhance the absorption performance by the absorbent body, It can always be in a dry state. The intermediate sheet 40 can be omitted.
  • Examples of the intermediate sheet 40 include the same material as the top sheet 30, spun lace, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper.
  • an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
  • the intermediate sheet 40 in the form shown in the figure is disposed in the center shorter than the width of the absorber 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 length of the absorbent body 56, or may be within a short length range centered on the region for receiving body fluid.
  • a typical material for the intermediate sheet 40 is a non-woven fabric having excellent body fluid permeability.
  • the body fluid impermeable sheet 70 is simply a sheet disposed on the back side of the absorber 56, and in the present embodiment, it is a sheet in which the absorber 56 is interposed between the top sheet 30. Therefore, the material of the main body liquid-impermeable sheet is not particularly limited. Specifically, for example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a nonwoven fabric that is substantially impervious to liquids by interposing a waterproof film (in this case, A body fluid-impermeable sheet is composed of a waterproof film and a non-woven fabric.).
  • liquid-impervious and moisture-permeable materials that have been favored and used in recent years from the viewpoint of preventing stuffiness.
  • an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this manner can be given.
  • the body fluid impermeable sheet 70 has a force capable of preventing side leakage of body fluid by extending (not shown) the surface to be used in a so-called forehead winding form.
  • the second body fluid impermeable sheet 72 is interposed between the double barrier sheets 64 forming the barrier force hose 60. According to this configuration, the second fluid-impermeable sheet 72 extends until the Norriya cuff 60 stands up! /. Therefore, the body fluid or the diffuser cuffs 60 and 60 that have spread laterally through the top sheet 30 can be obtained. There is also an advantage that side leakage of soft stool can be prevented.
  • the body fluid impermeable sheet 70 can be provided with a display section for product name, function description, character, pattern, etc., and this display section has a notification function for informing that urination has occurred. May be.
  • Barrier force hose 60, 60 provided on both sides of the product is a force provided to prevent urine and soft stool that move laterally along the top sheet 30 and prevent side leakage. Element.
  • the illustrated barrier strength hoop 60 is a doubled water-repellent nonwoven sheet, covers the folded portion of the top surface 30 from the back side of the absorbent body 56, and protrudes to the front side. It is formed so that.
  • a second fluid-impermeable sheet 72 is interposed between the double barrier sheets 64 forming the barrier fist 60. Yes.
  • a structure may be adopted in which the side portion of the body fluid impermeable sheet 70 is inserted between the double barrier sheets 64 and extends to the middle of the barrier force hose 60 projecting to the surface side.
  • the shape of the barrier first force hose 60 itself can be appropriately designed.
  • an elastic elastic member for example, a rubber thread 62 is stretched under the tip and middle portions of the protruding portion of the barrier cuff 60.
  • the cuffs 60 are erected by the contraction force during use.
  • the middle part of rubber thread 62 in the middle is positioned on the center side of thread rubbers 62 and 62 at the front end and fixed to the front and rear ends of topsheet 30. The side rises obliquely toward the center side, and the tip part rises obliquely outward from the middle part.
  • the absorbent element 50 includes an absorbent body 56 and a covering that wraps at least the back and side surfaces of the absorbent body 56. Sheet 58.
  • the covering sheet 58 can be omitted. Further, in the illustrated embodiment, the force S in which the holding sheet 80 is provided between the absorber 56 and the back surface side portion (lower part) of the covering sheet 58, and this holding sheet 80 can be omitted.
  • the absorbent 56 in addition to the one made of cotton-like pulp, the one having the aggregate force of the filaments 52, 52, etc. can be used.
  • the expansion / contraction part forming apparatus is connected to the ultrasonic vibration source 2 and the ultrasonic vibration source 2 to increase the vibration amplitude from the ultrasonic vibration source 2.
  • a horn 3 and an anvil roll 4 arranged opposite to the horn 3 are provided.
  • the ultrasonic vibration source 2 is fixed to a pressure arm (not shown), and the height can be adjusted.
  • the continuous sheet 1 is an original sheet of the exterior sheet 12.
  • the continuous sheet 1 is provided on the outer side of the guide roll.
  • tension control such as a step roll.
  • the continuous sheet 1 is formed by laminating and fixing two or three or more breathable water-repellent nonwoven fabrics, and includes an inner layer (inner sheet) 12H and an outer layer (outer sheet) 12S. A plurality of elastic elastic members 12C, 12C,... Arranged in parallel are sandwiched between them.
  • the nonwoven fabric can be made of polypropylene resin (PP), polyethylene resin (PE), polyethylene terephthalate resin (PET), or a composite of these.
  • the continuous sheet 1 is not limited to a nonwoven fabric, and a film made of polyethylene resin or the like can be used as long as it can be fixed by heat welding or ultrasonic welding, or a combination of a nonwoven fabric and a film can be used. .
  • the elastic elastic member 12C has an elastic property and has a tension together with the surrounding nonwoven fabric.
  • a known elastic yarn can be used as long as it can be fixed with force.
  • Materials include natural rubber, polyurethane, block polyether amide, block polyether ester, polyurethane urea, elastic polyolefin, thermoplastic styrene butadiene styrene (SBS), styrene / isoprene / styrene, styrene / ethylene / propylene / styrene, Styrene ethylene butadiene styrene (SEBS), hydrogenated styrene butadiene rubbers and elastomers based on mixtures of these with other polymers such as polystyrene or polyolefins can be used. It is also possible to use elastic yarns from segmented polyester or polyether urethane urea.
  • the thickness of the elastic elastic member 12C can be arbitrarily set.
  • the cross-sectional shape is not limited to a circle, but can be freely selected from an ellipse, a rectangle, and other geometric shapes.
  • the elastic elastic member 12C is not limited to a thread-like member, and although not shown, a wide ribbon-like member may be used.
  • a ribbon it is preferable that both ends in the width direction are welded to the sheet together with the inner layer 12H and the outer layer 12S.
  • the inner layer 12H and the outer layer 12S are welded in the vicinity of both ends in the width direction even for an elastic yarn that is orthogonal to only the elastic yarn in the tensile direction.
  • the orthogonal elastic yarn and the welded portion may be separated from each other, but if the welded portion is welded not only to both ends in the width direction of the elastic yarn but also to the central portion, the elastic yarn breaks or the welded portion becomes hard. This is not preferable because it may cause
  • a plurality of protrusions 4A, 4A,... are formed on the outer peripheral surface of the anvil roll 4 as ultrasonic welding surfaces.
  • a groove having a predetermined depth is formed between the protrusions 4A, 4A,.
  • the horn 3 and the projection 4A of the anvil roll 4 pinch the continuous sheet 1, and the inner layer 12H and the outer layer 12S of the continuous sheet 1 are welded by the welding part 11 as shown in FIGS. 9 (1) and (2).
  • Force S the groove formed between the protrusion 4A and the protrusion 4A is not fused, and a gap is formed in the folded continuous sheet 1.
  • the inner layer 12H may be positioned at the upper portion
  • the inner layer 12H may be positioned at the lower portion
  • the outer layer 12S may be positioned at the upper portion. The same applies to this point.
  • the length is substantially the same as the diameter (width).
  • the outer diameter of the elastic elastic member 12C is approximately 0.18-0.22 mm, and the interval between the protrusions 4A, 4A,... Is preferably set to 0 ⁇ 9 ⁇ ; . More preferably, it is preferably 0.9 to 1 times (excluding 1) the outer diameter of the cross section of the elastic elastic member 12C in the state of being pulled in the longitudinal direction.
  • the grooves between the protrusions 4A, 4A,... are for accommodating the elastic elastic members 12C so that the elastic elastic members 12C are not constricted by the protrusions. It is. Therefore, the interval between the adjacent grooves coincides with the arrangement interval between the adjacent elastic elastic members 12C, 12C,. Further, the depth of the groove between the protrusions 4A, 4A,... May be deep enough to accommodate the elastic stretch member 12C and deep enough that the continuous sheet 1 does not sag excessively.
  • the protrusions 4A are arranged in a lattice pattern, and the distance between the protrusions 4A and 4A in the width direction of the anvil roll 4 is set so that a tensile force is applied in the longitudinal direction. 1 to 1 times the outer diameter of the cross section of the elastic elastic member 12C under load. 1.
  • the elastic elastic member With the member 12C in the groove, the inner layer 12H and the outer layer 12S of the continuous sheet 1 are compressed and ultrasonically welded by the protrusion 4A and the horn 3.
  • the elastic elastic member 12C since the elastic elastic member 12C is accommodated in the groove, the elastic elastic member 12C having a tensile force is not compressed by the protrusion 4 and the horn 3.
  • this welding is performed in a state where tension is applied to the elastic elastic member 12C and in the vicinity of both ends in the width direction of the elastic elastic member 12C.
  • the load is removed (no tension)
  • the cross-sectional outer diameter of the elastic elastic member 12C becomes large, and the inner layer 12H and the outer layer 12S are welded.
  • the pressing force S is applied by the portion 11 so as to sandwich the width direction of the elastic elastic member 12C from both sides.
  • the elastic elastic member 12C is fixed only by the frictional force between the inner and outer layers 12H and 12S without using an adhesive.
  • the protrusions 4B of the anvil roll 4 are arranged in a lattice pattern, and the distance between the protrusions 4B and 4B in the width direction of the anvil roll 4 is In the case of 0.9 to 1 times (excluding 1) the cross-sectional outer diameter of the elastic elastic member 12C with a tensile load applied in the longitudinal direction, both ends of the elastic elastic member 12C in the width direction are As shown in FIGS. 12 (1) and (2), it is ultrasonically welded by the welded portion 11 together with the inner layer 12H and the outer layer 12S. In this case, as shown in FIGS.
  • the arrangement of the protrusions is not limited to the lattice shape, and may be a staggered array of protrusions 4C as shown in FIG.
  • the cross-section of the elastic member 12C in a state in which a tensile force is applied in the longitudinal direction between the protrusion 4C and the protrusion 4C adjacent in the oblique direction with respect to the rotation direction of the anvil roll 4 in the width direction.
  • the outer diameter is 1 to 1; 1.
  • the elastic elastic member 12C is fixed only by the frictional force between the inner and outer layers 12H and 12S without using an adhesive.
  • the material constituting the exterior sheet 12 is excellent in frictional force, 1.
  • the outer diameter of the elastic elastic member 12C in a state where a tensile force is applied in the longitudinal direction is 0.9 to 0.9!
  • the elastic elastic member 12C is fixed by the adhesive force at both ends in the width direction of the elastic elastic member 12C in addition to the frictional force with the inner and outer layers 12H and 12S. .
  • Anvil roll 22 protrusions 4A-4C arrangement pattern is not limited to grid or staggered, but other patterns Good.
  • the outer diameter of the cross-section of the elastic elastic member 12C with the groove width extended is 0.9 to ⁇ ! If the elastic expansion / contraction member 12C is welded and fixed as a double (excluding 1), the retention force of the elastic expansion / contraction member 12C is very high! /, So it is preferable! /, But the elongation rate is high! / Care must be taken because the elastic member 12C is easy to cut. In particular, when the elongation rate is 300% or more, it is not preferable to make the groove width 0.9 to 1 times (excluding 1).
  • the elastic elastic member 12C and the inner and outer layers 12H and 12S have high friction resistance, or the elastic elastic member 12C has a low elongation rate.
  • the force that can expand the groove width to about 1.3 times the cross-sectional outer diameter of the elastic elastic member 12C in the stretched state is usually 1.0 to 2; ⁇ ; 1. 1 times is particularly preferred.
  • the holding force (friction resistance) increases as it becomes closer to 1 ⁇ , but there is also a risk of cutting the elastic elastic member 12C.
  • the groove width needs to be within the above range and smaller than the diameter of the elastic elastic member 12C when it is relaxed.
  • the groove width is preferably 70% or less of the diameter of the elastic elastic member 2 when it is relaxed.
  • the depth of the groove (the height of the protrusions 4A to 4C) is preferably the same as the width of the groove. Specifically, the depth of the groove is preferably 0.9 to 1.2 times the cross-sectional outer diameter of the elastic elastic member 12C in the stretched state. Most preferred is a range of 1.0 to 1; 1. If it is less than 0 times, the force to hold the elastic member 12C becomes stronger.
  • the elastic elastic member 12C may be welded. In addition, it is not preferable that the depth of the groove is larger than the cross-sectional outer diameter of the elastic elastic member 12C when relaxed.
  • the inner and outer layers 12H and 12S are easily distorted in the CD direction (axial direction of the anvil) like a non-woven fabric, if the groove is too deep, the inner and outer layers 1 2H and 12S will be stretched during pinching. May be distorted, and there is a risk that sufficient force to sandwich the elastic elastic member 12C cannot be obtained.
  • each of the protrusions 4A to 4C is circular in the illustrated example, but may be a polygon such as a triangle or a quadrangle, or a pattern such as an ellipse, a star, or a heart. If a shape with no corners such as a circle or an ellipse is used, a soft texture can be obtained. If a cornered shape is used and the corner is placed so as to face the elastic elastic member 12C, the elastic elastic member 12C can be retracted ( ⁇ The phenomenon that the elastic stretchable member 12C contracts while being displaced without being fixed by the inner and outer layers 12H and 12S can be more reliably prevented. In this case, the pulling-in is reduced as the angle facing the elastic elastic member 12C is an acute angle. The angle of the angle facing the elastic elastic member 12C is preferably 15 to 120 degrees, and more preferably 30 to 90 degrees.
  • the size of the protrusions 4A to 4C is preferably 0.2 to 10 mm in diameter in the case of a circle, more preferably 0.3 to 5 mm, and 0.3 to 1 mm. It is particularly preferred that the thickness is 0.3 to 0.6 mm. The smaller the diameter, the better the texture of the sheet. However, if the diameter is too small, sufficient bonding strength between the inner and outer layers 12H and 12S cannot be obtained. Conversely, if the protrusions 4A to 4C are too large, the texture is lowered. For other shapes, the vertical and horizontal dimensional ratios may be extremely different if they are set based on the area in the case of a circle.
  • Area of the distal end surface of the collision force 4A ⁇ 4C is preferably a 0. 03 ⁇ 80mm 2, more preferably from 0. 07 ⁇ 20mm 2, 0. 07 ⁇ 0. Especially it is preferably from 8 mm 2 0.07 to 0.3 mm 2 is most preferable.
  • the distance between the protrusions 4A to 4C in the MD direction is generally a force that can be set to about 0.3 to 20 mm.
  • the protrusions 4A to 4C which are not the ones, may be continuous in the MD direction in a strip shape (linear shape).
  • the protrusions 4A to 4C have a circular shape with a diameter of 0.3 to 0.6 mm.
  • the distance between the protrusions 4A to 4C may be, for example, about 0.3 to 1. Omm in the MD direction and about 0.3 to 3 mm in the CD direction (anvil roll axial direction). Note that the spacing in the MD direction and the spacing in the CD direction of the protrusions 4A to 4C are indicated by DMD and DCD in FIG. 15, respectively.
  • the protrusions 4A to 4C are arranged in the above-described lattice arrangement, the protrusions 4A to 4C are located on both sides in the width direction at the same portion in the longitudinal direction of the elastic elastic member 12C, so that a high holding force is obtained.
  • the risk that the elastic elastic member 12C is welded or cut increases.
  • the staggered arrangement when used, the risk of the elastic stretchable member 12C being welded or cut decreases, but the holding power also decreases.
  • rows of protrusions arranged at a predetermined periodic interval in the MD direction are provided with a predetermined interval in the CD direction.
  • the phase of the arrangement period of the protrusions is shifted with respect to the adjacent row, and it may be arranged so that the phase is shifted by 1/2 with respect to the adjacent protrusion row as shown in the figure.
  • an arrangement with a phase shift of 1/4 may be used.
  • the area ratio of the welded portion 11 with respect to the entire area is preferably 40% or less, and more preferably 30% or less, in order to obtain a soft texture. Most preferably, it is 20% or less. Further, in the non-fixed region of the elastic elastic member 12C, the area ratio of the welded portion 11 needs to be at least 2% in order to maintain the bonding strength of the inner and outer layers 12H and 12S. In the fixed region of the elastic stretchable member 12C, the sheet is squeezed by the shrinkage of the elastic stretchable member 12C, so that a bonding strength higher than the non-fixed region of the elastic stretchable member 12C is required. Accordingly, in the fixed region of the elastic elastic member 12C, the area ratio of the welded portion 11 is preferably 5% or more, more preferably 10% or more.
  • the elastic stretchable members 12C, 12C, ... in a state where a tensile force is applied to the elastic stretchable members 12C, 12C, ...
  • the inner layer 12H and the outer layer 12S are welded at a predetermined interval in the vicinity of both end portions in the width direction, so that the elastic elastic members 12C, 12C,... Are fixed to the outer sheet 12 by the frictional force with the outer sheet 12.
  • the paper diaper which has the expansion-contraction part of the structure to be made can be manufactured.
  • the elastic stretch members 12C, 12C,... are fixed to the exterior sheet 12 by the frictional force with the exterior sheet 12 and the adhesive force at the end in the width direction of the elastic stretch member 12C by being welded to the layer 12S at a predetermined interval.
  • the paper diaper which has the expansion-contraction part of the structure to be made can be manufactured.
  • the stretchable part forming method and apparatus therefor according to the present invention are not limited to the stretchable parts such as shearing, barrier one-off fuzz, and gasket cuffs in a pants-type paper diaper. It can also be applied to the formation of stretchable parts such as barrier one-off floss, gasket cuffs, and stretchable tapes, and can also be applied to the formation of stretchable parts such as normal cuffs and gasket cuffs of absorbent articles including napkins.
  • FIG. 15 shows a case where the stretchable portion forming method of the present invention is applied to the elastic stretchable member 12 C used for shearing formation around the trunk of a pant-type paper diaper.
  • the welded portion group region 44 composed of a large number of welded portions 11 formed at the above-described arrangement / interval and the non-welded portion region 45 having no welded portion are arranged in the longitudinal direction of the elastic member 12C (MD direction).
  • MD direction longitudinal direction of the elastic member 12C
  • the stretchability is improved and the area of the welded portion 11 is reduced, so that a softer texture and higher air permeability can be obtained.
  • the welded portion group region 44 to be fixed by the welded portion 3 can be continuously provided over the entire longitudinal direction (MD direction) of the elastic elastic member 2.
  • Such an intermittent arrangement can be applied even when a large number of elastic elastic members 2 are arranged side by side.
  • the positions in the longitudinal direction (MD direction) of the fixed portions by the welded portions of the elastic elastic members 2 are different, elasticity The wrinkles formed by the contraction of the elastic member 2 become irregular, and an uneven surface with poor appearance is formed. Therefore, when adopting the intermittent arrangement as described above, as shown in FIG. 15, it is preferable to align the position of the fixing portion by the welded portion in the longitudinal direction (MD direction) of the elastic elastic member 2.
  • the width of the welded portion group region 44 (the distance between the centers of the welded portions 11 located at both ends) W44 is preferably about 2 to 1 Omm, more preferably about 3 to 5 mm.
  • the center distance DCT between adjacent welded portion group regions 44 is preferably about 5 to 20 mm. Further, it is more preferable that the relationship of DCT / 2 ⁇ W44 is satisfied.
  • the inner layer 12H and the outer layer 12S in the stretchable part are bonded by ultrasonic welding or thermal welding without using any adhesive. It is good also as a structure which was passed.
  • the back elastic elastic member 12C and / or the abdominal elastic elastic member 12C may be cut or not provided at the portion of the exterior sheet 12 that overlaps the absorbent portion 20.
  • the elastic expansion member 12C has a high expansion ratio, and if the tensile force applied to the expansion / contraction part is large during use, the elastic expansion / contraction member 12H and 12S can be elastically expanded / contracted sufficiently only by the frictional force with the inner and outer layers 12H and 12S.
  • the member 12C may not be fixed. In that case, at least at one end in the longitudinal direction of the elastic elastic member 12C, the substantially elastic welding members 12D and 12D arranged so as to cut the elastic elastic member 12C arranged in parallel, The elastic elastic member 12C and the inner layer 12H and the outer layer 12S of the exterior sheet 12 may be welded and fixed to secure the elastic elastic member 12C.
  • the ultrasonic bonding method is suitable for carrying out the stretchable portion forming method of the present invention, but the plain roll and the force facing the embossed roll having unevenness, Therefore, it can also be carried out by using a hot emboss bonding method in which a sheet is crimped by heat and pressure.
  • elastic elastic member 2 spandex of 470dtex (diameter: 0.31 lmm) was used and stretched to 270% along the lateral direction of the sheet (2.7 times the original length, diameter is 0. 162mm).
  • 20 elastic stretch members 2 were arranged in parallel with an interval of 5 mm.
  • softness is a sensory evaluation compared to a sheet in which an elastic elastic member is fixed with a conventional adhesive, and 9 or more out of 10 subjects are evaluated as soft and ⁇ . , 7-8 people evaluated as soft! /, ⁇ , 4-6 people evaluated as soft! /, ⁇ , 3 or less evaluated softness, X .
  • ⁇ indicates that the sheet itself was destroyed when the adhered sheet was peeled off by hand. The case where the sheet was partially broken or delaminated with delamination was marked with ⁇ , the sheet peeled leaving a slight fluff was marked with ⁇ , and the sheet that did not adhere substantially was marked with X.
  • the elastic member from the cut part is lmm or less, ⁇ , 3mm or less is ⁇ , and 5mm or less , ⁇ for 10 mm or less, and X for 11 mm or more.
  • ⁇ indicates that the number of cutting points is 1 or less, ⁇ indicates 5 or less, and ⁇ indicates 10 or less.
  • 20 or less were designated as ⁇ to ⁇ , and 21 or more were designated as X.
  • FIG. 1 is a perspective view of a pants-type diaper.
  • FIG. 2 is a plan view of the body side of the unfolded diaper.
  • FIG. 3 is a cross-sectional view taken along line III-III in FIG.
  • FIG. 4 is a plan view of the outer surface side of the unfolded diaper.
  • FIG. 5 is a schematic cross-sectional view taken along line V-V in FIG.
  • FIG. 6 is an enlarged view of the shearing part.
  • FIG. 7 is a schematic view for explaining the stretchable part forming apparatus.
  • FIG. 8 is a cross-sectional view in the width direction and a cross-sectional view of the first embodiment showing a state in which a continuous sheet is sandwiched between a horn and an anvil roll.
  • FIG. 9 is a cross-sectional view in the width direction and a cross-sectional view of the first embodiment of the continuous sheet in a state where a tensile force is applied to the elastic elastic member.
  • FIG. 10 is a cross-sectional view in the width direction and a transverse cross-sectional view of the first embodiment of the continuous sheet in a state where no tensile force is applied to the elastic elastic member.
  • FIG. 11 is a cross-sectional view in the width direction and a cross-sectional view of the second embodiment showing a state in which a continuous sheet is sandwiched between a horn and an anvil roll.
  • FIG. 12 is a cross-sectional view in the width direction and a cross-sectional view of the second embodiment of the continuous sheet in a state where a tensile force is applied to the elastic elastic member.
  • FIG. 13 is a cross-sectional view in the width direction and a transverse cross-sectional view of a second embodiment of a continuous sheet in a state where a tensile force is not applied to an elastic elastic member.
  • FIG. 14 is a cross-sectional view showing a state in which a continuous sheet is sandwiched between anvil rolls having an array of staggered protrusions.
  • FIG. 15 is a schematic view showing an application example of the pants-type paper diaper to the waist part shirring.
  • FIG. 16 is a schematic diagram showing another example of application to the waistline shearing of a pant-type paper diaper.

Abstract

Le problème à résoudre dans le cadre de cette invention concerne une technique destinée à améliorer l'extensibilité, etc. d'une partie extensible d'un article absorbant tel qu'une couche en papier. Selon la technique de l'invention, un élément extensible élastique et une feuille extérieure sont fixés ensemble sans utiliser d'agent adhésif. La solution proposée consiste à assembler par fusion une couche interne (12H) et une couche externe (12S) dans la partie extensible, à des intervalles prédéfinis près des deux extrémités dans la direction latérale de l'élément extensible élastique (12C), la force de traction étant appliquée à l'élément extensible élastique (12C). Ainsi, l'élément extensible élastique (12C) est fixé à la feuille extérieure (12) par la force de friction entre l'élément extensible (12C) et la feuille extérieure (12).
PCT/JP2007/069010 2006-09-29 2007-09-28 Couche en papier, procédé destiné à former une partie extensible d'un article absorbant, et dispositif destiné à former la partie extensible WO2008041639A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2006-269695 2006-09-29
JP2006269695 2006-09-29
JP2006324861 2006-11-30
JP2006-324861 2006-11-30
JP2007181589A JP5124187B2 (ja) 2006-09-29 2007-07-11 吸収性物品における伸縮部形成方法及びその形成装置
JP2007181590A JP5124188B2 (ja) 2006-11-30 2007-07-11 紙おむつ
JP2007-181590 2007-07-11
JP2007-181589 2007-07-11

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EP2671551A1 (fr) * 2011-02-02 2013-12-11 Unicharm Corporation Couche-culotte de type culotte jetable et son procédé de fabrication
JP2015091554A (ja) * 2015-02-19 2015-05-14 ユニ・チャーム株式会社 吸収性物品
RU2610104C2 (ru) * 2011-06-21 2017-02-07 Дзе Проктер Энд Гэмбл Компани Абсорбирующее изделие с поясной тесёмкой, выполненное с комбинированным стягиванием
CN106456383A (zh) * 2014-04-28 2017-02-22 尤妮佳股份有限公司 吸收性物品的多个片材的固定装置以及固定方法
EP3146951A1 (fr) * 2015-09-28 2017-03-29 Unicharm Corporation Procédé de fabrication de couche-culotte
US10596047B2 (en) 2017-02-28 2020-03-24 Kimberly-Clark Worldwide, Inc. Elasticated materials with directional stretch properties
CN111093580A (zh) * 2017-10-04 2020-05-01 尤妮佳股份有限公司 伸缩性片和吸收性物品
EP2976054B1 (fr) 2013-03-22 2020-06-17 The Procter and Gamble Company Articles absorbants jetables
US11020286B2 (en) 2017-12-19 2021-06-01 Kimberly-Clark Wordwide, Inc. Absorbent articles with visually different chassis and waistbands
US11123934B2 (en) 2016-10-31 2021-09-21 Kimberly-Clark Worldwide, Inc. Method of forming a composite web utilizing a rotary bonding system with an anvil pattern
WO2023285004A1 (fr) * 2021-07-13 2023-01-19 Herrmann Ultraschalltechnik Gmbh & Co. Kg Méthode de production d'un matériau collecté et matériau collecté
EP3677231B1 (fr) 2019-01-07 2023-02-01 Curt G. Joa, Inc. Appareil et procédé de fabrication d'une structure composite élastique pour un produit sanitaire absorbant
US11597184B2 (en) 2017-10-31 2023-03-07 Kimberly-Clark Worldwide, Inc. Elastic laminates with curved elastics and methods for manufacturing
US11684522B2 (en) 2017-10-31 2023-06-27 Kimberly-Clark Worldwide, Inc. Elastic laminates with curved elastics and methods for manufacturing

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WO1998055292A1 (fr) * 1997-06-06 1998-12-10 The Procter & Gamble Company Structures laminees extensibles
JP2002283479A (ja) * 2001-03-23 2002-10-03 Uni Charm Corp 伸縮性物品及びこれを用いた下着
JP2003038556A (ja) * 2001-07-31 2003-02-12 Uni Charm Corp パンツ型の使い捨て着用物品
WO2003059603A1 (fr) * 2001-12-28 2003-07-24 Sca Hygiene Products Ab Bande elastique, procede et appareil de fabrication correspondant et article absorbant jetable comprenant une bande elastique

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2671551A4 (fr) * 2011-02-02 2017-03-29 Unicharm Corporation Couche-culotte de type culotte jetable et son procédé de fabrication
EP2671551A1 (fr) * 2011-02-02 2013-12-11 Unicharm Corporation Couche-culotte de type culotte jetable et son procédé de fabrication
RU2610104C2 (ru) * 2011-06-21 2017-02-07 Дзе Проктер Энд Гэмбл Компани Абсорбирующее изделие с поясной тесёмкой, выполненное с комбинированным стягиванием
EP2976054B1 (fr) 2013-03-22 2020-06-17 The Procter and Gamble Company Articles absorbants jetables
CN106456383A (zh) * 2014-04-28 2017-02-22 尤妮佳股份有限公司 吸收性物品的多个片材的固定装置以及固定方法
US10232596B2 (en) 2014-04-28 2019-03-19 Unicharm Corporation Fixing device of plurality of sheets associated with absorbent article, and fixing method
JP2015091554A (ja) * 2015-02-19 2015-05-14 ユニ・チャーム株式会社 吸収性物品
US10052238B2 (en) 2015-09-28 2018-08-21 Unicharm Corporation Method of manufacturing pants-type diaper
EP3146951A1 (fr) * 2015-09-28 2017-03-29 Unicharm Corporation Procédé de fabrication de couche-culotte
US11123934B2 (en) 2016-10-31 2021-09-21 Kimberly-Clark Worldwide, Inc. Method of forming a composite web utilizing a rotary bonding system with an anvil pattern
US10973703B2 (en) 2017-02-28 2021-04-13 Kimberly-Clark Wordwide, Inc. Elasticated materials with directional stretch properties
US10596047B2 (en) 2017-02-28 2020-03-24 Kimberly-Clark Worldwide, Inc. Elasticated materials with directional stretch properties
CN111093580B (zh) * 2017-10-04 2020-11-06 尤妮佳股份有限公司 伸缩性片和吸收性物品
CN111093580A (zh) * 2017-10-04 2020-05-01 尤妮佳股份有限公司 伸缩性片和吸收性物品
US11597184B2 (en) 2017-10-31 2023-03-07 Kimberly-Clark Worldwide, Inc. Elastic laminates with curved elastics and methods for manufacturing
US11684522B2 (en) 2017-10-31 2023-06-27 Kimberly-Clark Worldwide, Inc. Elastic laminates with curved elastics and methods for manufacturing
US11020286B2 (en) 2017-12-19 2021-06-01 Kimberly-Clark Wordwide, Inc. Absorbent articles with visually different chassis and waistbands
US11786415B2 (en) 2017-12-19 2023-10-17 Kimberly-Clark Worldwide, Inc. Absorbent articles with visually different chassis and waistbands
EP3677231B1 (fr) 2019-01-07 2023-02-01 Curt G. Joa, Inc. Appareil et procédé de fabrication d'une structure composite élastique pour un produit sanitaire absorbant
WO2023285004A1 (fr) * 2021-07-13 2023-01-19 Herrmann Ultraschalltechnik Gmbh & Co. Kg Méthode de production d'un matériau collecté et matériau collecté
WO2023285450A1 (fr) * 2021-07-13 2023-01-19 Herrmann Ultraschalltechnik Gmbh & Co. Kg Dispositif et procédé de fabrication d'un matériau froncé

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