WO2010068150A1 - Procédé et appareil pour la fixation - Google Patents

Procédé et appareil pour la fixation Download PDF

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Publication number
WO2010068150A1
WO2010068150A1 PCT/SE2008/000704 SE2008000704W WO2010068150A1 WO 2010068150 A1 WO2010068150 A1 WO 2010068150A1 SE 2008000704 W SE2008000704 W SE 2008000704W WO 2010068150 A1 WO2010068150 A1 WO 2010068150A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
pattern
web
diameter
bonding
Prior art date
Application number
PCT/SE2008/000704
Other languages
English (en)
Inventor
Marcus Lehto
Robert Perneborn
Original Assignee
Sca Hygiene Products Ab
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
Application filed by Sca Hygiene Products Ab filed Critical Sca Hygiene Products Ab
Priority to PCT/SE2008/000704 priority Critical patent/WO2010068150A1/fr
Publication of WO2010068150A1 publication Critical patent/WO2010068150A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0076—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised in that the layers are not bonded on the totality of their surfaces
    • B32B37/0084—Point bonding
    • 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
    • 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
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin 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
    • B29C66/05—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
    • B29C66/40—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
    • B29C66/45—Joining of substantially the whole surface of the articles
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • 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
    • B29C66/83413—Roller, cylinder or drum types cooperating 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93411—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the parts to be joined having different speeds
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
    • B29C66/9392—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges in explicit relation to another variable, e.g. speed diagrams
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/539—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 absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/53991—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 absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers by ultrasonic method
    • 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
    • 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
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/723—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 being multi-layered
    • B29C66/7234—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 being multi-layered comprising a barrier layer
    • B29C66/72343—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 being multi-layered comprising a barrier layer for liquids
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
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    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
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    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
    • 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
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/10—Fibres of continuous length
    • B32B2305/20—Fibres of continuous length in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/14—Velocity, e.g. feed speeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one layer

Definitions

  • the present invention relates to a bonding method and an apparatus for forming a bonded web. More particularly, the present invention pertains to a technique for forming a bonded web by inducing a high-rate of shear deformation.
  • Polymeric films and fabrics may be been bonded by employing conventional techniques such as adhesive bonding, thermal bonding, and ultrasonic bonding.
  • the bonding techniques often involve passing webs of materials through the nip formed between a pair of counter-rotating bonding rollers, which roller may include bonding rollers with smooth surfaces, bonding rollers with surfaces that include distributed raised patterns of bonding elements, and combinations of rollers with smooth and patterned surfaces.
  • the bonding techniques may involve combinations of heat and pressure to effect the desired bonding.
  • the bonding rollers may be of a different construction or be rotated at different speeds to produce a line speed differential between the bonding rollers.
  • the bonding techniques as indicated above produce better bonding when conducted at lower bonding speeds.
  • US 2006/266473 discloses a method that involves increasing the bonding speed to overcome the problem of heat loss.
  • the line speed is limited by preceding or subsequent process steps.
  • an increased bonding speed may cause the raised patterns on a bonding roller to melt through the web material when certain material combinations are used. In such cases it may not be practically possible to increase the bonding speed.
  • the present invention relates to a bonding method and an apparatus for performing said method.
  • the bonding method involves delivering a web comprising selected materials to be bonded in a predetermined pattern through a nip region between a pattern roller and an anvil roller to form a bonded web.
  • the web materials to be bonded include a first web of a selected material and at least a second web of a selected material.
  • the bonding method involves
  • he relationship between the anvil roller and the pattern roller may be selected so that the equivalent radius R e is less than or equal to 40 mm.
  • At least one of the first diameter and the second diameter may be selected to be equal to or less than 160 mm.
  • the smaller of the first diameter and the second diameter may be selected to be equal to or less than 80 mm.
  • at least one of the first diameter and the second diameter is selected equal to or greater than 20 mm.
  • the diameter of the pattern roller may have a number of restrictions imposed on it. For instance, the minimum diameter of the pattern roller determines the circumference of the roller. If the desired pattern is a continuous or intermittent straight line, then the diameter is not a problem. However, for spaced repeated patterns it is often desired to allow the circumference to correspond to the length of one or more products in the machine direction of a product web. In cases where the circumference of the pattern roller corresponds to the length of multiple products, the diameter of the pattern roller may be 1 ,5 m or more. Because the anvil roller may have a simpler design, being substantially cylindrical, it is easier to allow this roller to be replaced when required in order to achieve desired process parameters. In such cases the first diameter is selected equal to or less than the second diameter.
  • the bonding method may also involve using at least one support roller for supporting at least the roller having the smaller of the first diameter and the second diameter.
  • a pair of supporting rollers are preferably, but not necessarily, used for supporting a relatively small diameter roller in order to prevent the roller from deflecting.
  • one or more support rollers may be used for supporting a roller or rollers having a diameter equal to or less that 50 mm.
  • a deflection can be caused by relatively thick material webs, high forces in the roller nip, or a relatively large pattern coverage fraction cp.
  • L p 2 ⁇ R P where R P is the radius of the pattern roller.
  • Figures 6 and 7 show bonding patterns comprising rectangular and square areas, respectively.
  • the example in Figure 6 shows a schematic web moving in the direction of the arrow A.
  • the web has a pattern width Wp of 9 mm and the function yi(x) is constant along the length of each pattern, here 3 mm.
  • the example in Figure 7 shows a schematic web moving in the direction of the arrow A.
  • the web has a pattern width Wp of 21 mm and the function yi(x) is constant along the length of each pattern, here 3 mm.
  • a weighted pattern coverage fraction w n (x) may be calculated.
  • a parameter x eff is defined based on a predetermined contact length between the web materials to be bonded and the bonding apparatus, for example in the nip between an ultrasonic horn and a patterned anvil roll.
  • This parameter x etf is in the calculations assumed to be 4 mm, which has shown to be a standard value for commonly available bonding equipment of this kind.
  • a weight function %(x) is introduced since not the entire area of contact is in maximum contact with the web materials, and thus the entire area of contact is found as a weight function.
  • the choice of weight function w n (x) is defined over a certain interval and is defined below;
  • x etf is for the purpose of this invention assumed to be 4 (mm).
  • the boundary conditions of w n (x) are set such that the compression has a maximum at the centre of the contact area and such that the compression of the outer edges of the contact area is far less.
  • the weight function w n (x) is used for calculating the weighted mean value of the area of contact between the bonding apparatus (for example ultrasonic horn and pattern roll) and the web materials as seen in a transverse direction of the seam
  • This weighted mean value is defined as the contact area according to the invention, and can for example be calculated by means of an image analysis of a bonding pattern as described below.
  • a scanning of the bonding pattern is made using a resolution of 1200 dpi (dots per inch).
  • the pattern is evaluated as a normalized inverted black and white image with the pattern coloured black. Therefore a function defining the pattern image has to be introduced;
  • the normalized and weighted contact area is now defined as;
  • ⁇ is the integer number of pixels within the length of the pattern image.
  • the contact area of the bonding pattern should be between 10 and 30% of the width Wp of the bonding pattern at any given point along the length of the bonding pattern. In preferred embodiments the contact area is between 10 and 25% and preferably between 13 and 20% of the width Wp of the bonding pattern at any given point along the length of the bonding pattern.
  • the method involves feeding the web materials through the roller nip at a predetermined line speed and selecting the first and second speeds to match the said line speed.
  • the desired bonding can be produced while operating at relatively low pressure values and at very high line speeds or at relatively high pressure values and at very low line speeds.
  • a relatively high line speed is considered to be above 100 m/min, while a relatively low line speed is considered to be below 100 m/min.
  • the method is particularly advantageous at line speeds less than
  • the relationship between the anvil roller and the pattern roller may be selected so that the equivalent radius R e is selected to be from 5 mm to 40 mm.
  • the equivalent radius R e is defined as the equivalent roller radius for a single roller on a flat surface. This radius is determined by the function
  • Dp may be determined by the shape of a desired pattern and/or the length or size of the bonded web or laminate product to be bonded.
  • D A may be selected depending on process parameters, in view of materials to be joined, line speed, required power to achieve joining and allowable nip force.
  • the power required to achieve sufficient bonding between the web materials fed between the rollers can be expressed as;
  • PA - where P A is the power per unit area (W/m 2 );
  • E a is the energy per unit area (J/m 2 ); and t is the time used for compressing the web materials.
  • the value of the energy per unit area E a can be defined as a function of the line speed, at which the web is fed between the rollers, and the equivalent radius R e according to the following equations;
  • P is the total power in the nip between the rollers (W); and Ap is the pattern area speed (m 2 /s).
  • Wp is the pattern width (m); cp is the pattern coverage fraction (%/100);
  • V L is the line speed, at which the web is fed between the rollers (m/s).
  • pattern coverage fraction cp may be replaced by the weight function w n (x) as defined above.
  • V zm is the vertical compression speed mean value (m/s).
  • V 2 is the (maximum) vertical compression speed (m/s).
  • VZ VL * sin ⁇
  • V L is the line speed, at which the web is fed between the rollers (m/s); and ⁇ is the contact angle during compression in the nip (radians).
  • cc a cos — —
  • R e is the equivalent radius (m), as defined in equation (1), and h is the penetration depth during compression (m).
  • the time t for compression can be defined as a function of the line speed and the equivalent radius R e according to the following equations;
  • V L is the line speed (m/s).
  • R e is the equivalent radius (m), as defined in equation (1); h is the penetration depth during compression (m); and ⁇ is the contact angle during compression in the nip (radians).
  • the power PA required for adequate bonding between the web materials can be said to be dependent on the force F in the roller nip, the line speed VL at which the web is fed between the rollers, and the geometrical design of the cooperating anvil and pattern rollers.
  • the force F in the roller nip may be constrained to a maximum value by the type and/or thickness of the materials to be bonded.
  • the force F in the roller nip may be determined by a suitable sensor provided for one or both of the anvil roller and the pattern roller.
  • a forcing mechanism can be provided to exert a force onto one or both of the rollers, in order to operatively urge the pattern roller and the anvil roller together with a predetermined force.
  • the forcing mechanism can be located at each end of the axis supporting the pattern roller and be configured to exert a desired force in the direction of the anvil roller.
  • the line speed VL may be controlled by process steps occurring before or after the roller nip. Hence, the process requirements may place limitations on the line speed VL.
  • the pattern width W p , pattern coverage fraction cp and the penetration depth h during compression may be determined by the combination of web materials to be bonded and/or the geometrical constraints of the desired pattern.
  • the bonding pattern formed by the raised elements on the pattern roller is determined by the desired pattern on the finished or intermediate laminate product leaving the roller nip, it may neither be possible nor practical to make adjustments to the pattern roller.
  • the power P A required for adequate bonding can be controlled by a purposive selection of the equivalent radius R e , which is determined by the diameters of the anvil roller and the pattern roller.
  • the anvil roller as a rule is cylindrical with no raised elements, or at least with raised elements having a limited height. Because of the relatively simple design of the anvil roller, it is preferable to replace this roller in order to select the diameter of the anvil roller to achieve said required power P A for adequate bonding. For instance, as indicated in Equation 11 , a reduction of the equivalent radius R e will cause an increase of the power P A .
  • the bonding method involves feeding the web materials through the nip at a predetermined line speed V L and selecting the first and second rotational speeds of the anvil roller and pattern roller, respectively, to match the said line speed. If there are no limiting process requirements, the line speed may also be selected depending on the properties of the materials to be joined to achieve said required power P A for adequate bonding. The line speed may be determined by production steps prior to or after the bonding step, or be measured by a suitable sensor provided for one or both of the anvil roller and the pattern roller.
  • the invention further relates to a bonding apparatus comprising a pattern roller and an anvil roller arranged to feed a web comprising selected materials to be bonded in a predetermined pattern through a nip region between the pattern roller and the anvil roller to form a bonded web.
  • the web materials to be bonded include a first web of a selected material and at least a second web of a selected material.
  • the anvil roller has a first diameter D A and is rotated at a first predetermined speed.
  • the pattern roller has a second diameter D P and is rotated at a second predetermined speed, which pattern roller is provided with raised surface elements arranged in a predetermined pattern.
  • the anvil and pattern rollers have an equivalent radius R e of less than or equal to 40 mm.
  • the anvil and pattern rollers are arranged to cause a compressive mechanical deformation in the nip between the anvil and pattern rollers by means of said raised surface elements, in order to induce an internal heating of the web materials.
  • the raised surface elements on the pattern roller and the outer surface of the anvil roller are arranged to compress the web materials at a deformation rate sufficient to cause a local temperature increase within the deformed materials of the web material between the raised surface elements and the anvil roller to bond the web materials.
  • the bonding method includes a delivering of a web material comprising one or more selected bonding material webs through a nip region between at least one cooperating pair of bonding rollers to form a bonded web.
  • a pattern roller can be configured with a relatively high, pattern line speed.
  • the pair of bonding rollers can be configured to provide a relatively low, bonding pressure value.
  • the method and apparatus of the invention can more efficiently produce bonds having a desired, sufficiently high strength value. The desired bonding can be produced while operating at relatively low pressure values and at very high line speeds or at relatively high pressure values and at very low line speeds.
  • a relatively high line speed is considered to be above 100 m/min, while a relatively low line speed is considered to be below 100 m/min.
  • the effect of invention is particularly useful at relatively low line speeds (less than about 100 m/min).
  • relatively low line speed the significance of the choice of R e for achieving a desired result increases.
  • the deformation rate of the web materials as they pass through the roller nip is proportional to the vertical compression speed V z .
  • V L less than about 100 m/min, the deformation rate can be increased substantially if the equivalent radius R e is reduced. This effect can also be seen at line speeds over 100 m/min, although the effect of modifying the equivalent radius R e is less obvious at such speeds.
  • Adaptation of, for instance, the bonding pressure value when operating at a predetermined line speed can be achieved by selecting a suitable value for the equivalent radius of the bonding rollers.
  • a suitable value for the equivalent radius may be selected by applying the above formulae.
  • the desired bonding can be produced while operating at ordinary room temperatures. Additionally, the method and apparatus of the invention can produce the desired bonding between work materials that are ordinarily deemed to be incompatible when employing conventional thermal or ultrasonic bonding techniques. Compared to thermal bonding, the method according to the invention does not cause burnt welds or local melting through the materials to be bonded. Compared to ultrasonic bonding, the method according to the invention is simpler, as ultrasonic horns are not required, and is better suited for relatively wide seams and materials of different thicknesses.
  • the process and apparatus of the invention can have a lengthwise, machine- direction which extends in the longitudinal direction of the web passed through the machine; a lateral cross- direction which extends transversely across the width of said web; and a z-direction at right angles to the x- and y-directions.
  • the machine-direction is the direction along which material webs are transported length-wise along and through a nip between a pair of cooperating bonding rollers.
  • the cross-direction lies generally parallel to the local horizontal, and is aligned perpendicular to the local machine-direction.
  • the z- direction is aligned substantially perpendicular to both the machine- direction and the cross-direction, and extends generally along a depth-wise, or thickness dimension of the web material.
  • the examples given in this text relate to a substantially horizontal machine direction, but the invention is not limited to these examples. Consequently, the machine direction may also be vertical, or located in any plane between horizontal and vertical.
  • the method and apparatus according to the invention allows for the production of bonds having a desired, sufficiently high strength value.
  • the desired level of bonding can be produced while operating at different pressure values and a suitable predetermined line speed.
  • the method and apparatus can produce distinctively interconnected bonds having high, attachment strength values.
  • the desired bonding can be accomplished while operating at ordinary room temperatures.
  • the method and apparatus of the invention can produce adequate bonding between web materials that may normally be considered incompatible, particularly when using conventional thermal or ultrasonic bonding techniques.
  • the method and apparatus of the invention may be employed in any suitable manufacturing system that includes bonding of selected web materials into an assembled web.
  • the method and apparatus are, for instance, suitable for the production of reusable articles, disposable articles or disposable absorbent articles or the like.
  • the method may involve bonding at least one layer of a web material comprising a thermoplastic material and at least one further layer of a web material comprising the same or a different material.
  • the said web material layers can be covering materials or cover layers intended for disposable absorbent articles such as diapers, incontinence pads, sanitary towels and panty liners.
  • An absorption body or article may be enclosed between an inner cover layer, intended to face the wearer during use, and an outer cover layer, intended to face away from the wearer during use.
  • the front and rear portions and the crotch portion of the absorbent article are made in one continuous piece which thus forms the outer cover layer.
  • This outer cover layer can consist of one or more layers of non-woven material or other textile-like materials.
  • the outer cover layer can comprise entirely or partly a liquid- impermeable material, such as a liquid-impermeable plastic film, a non- woven layer which has been coated with a liquid-blocking material, or some other flexible material layer which has the capacity to resist liquid penetration.
  • the inner cover layer can comprise any liquid-permeable material suitable for the purpose. Examples of such materials are various types of thin non-woven material, perforated plastic films, net material, liquid-permeable foamed material or the like.
  • the outer cover layer can be shaped so that it forms the entire outer extent of the absorbent article, such as a pant diaper or the like.
  • the inner and outer cover layers can be interconnected around the absorption body by, for example, the bonding method according to the invention.
  • one or both the cover layer(s) can be connected to one or more component parts making up the absorbent article, such as a belt, a side panel, a layer of the absorption body, or to the absorption body itself, by the bonding method according to the invention.
  • the web material making up the assembled web can include one or more selected materials.
  • each web material may include one or more individual webs of the same or different materials.
  • at least one web material can comprise a laminate including a first web of a selected, first material and at least a second web of a selected, second material.
  • the first and second materials can be the same or different.
  • Any suitable web material may be employed. Suitable materials are those comprising a sufficient amount of thermoplastic material that can be softened or melted in the process. Examples of suitable thermoplastic polymers for use in the method according to the invention are polyethylene, polyesters, polypropylene and other polyolefin homopolymers and copolymers and blends of thermoplastic polymers.
  • the materials may comprise thermoplastic films, nettings, nonwoven webs or laminates of two or more layers of film, netting or nonwoven.
  • the materials may be perforated or non-perforated.
  • the nonwoven webs and films have a high content of thermoplastic material and may contain at least 50% thermoplastic material and preferably at least 80% thermoplastic material.
  • the nonwoven material can also be a spunbond nonwoven material, an air-thru nonwoven material, a spunlace nonwoven (hydroentangled) material, a meltblown nonwoven material, or a combination of these.
  • the raw material can be polypropylene (PP), polyethylene (PE) polyester (PET), polyamide (PA), or a combination of these.
  • this can be a mixture of fibres from different polymers, although each fibre can also contain different polymers (for example PP/PE bi- component fibres or PP/PE copolymers).
  • the plastic film can consist of PE or PP, PET, PLA or amyl (or any other thermoplastic polymer), or a mixture or copolymers of the aforementioned polymers.
  • At least one of the first and second webs can be a fabric web. Accordingly, the invention can be configured to bond a nonwoven fabric to a similar or substantially identical nonwoven fabric; to bond a nonwoven fabric to a different nonwoven fabric; to bond a nonwoven fabric to a film material; or to bond a film material to a film material.
  • the method and apparatus of the invention can include at least one cooperating pair of counter-rotatable or counter-rotating bonding rollers.
  • the bonding rollers can include at least one rotatable pattern roller and at least one rotatable anvil roller.
  • the pattern roller has an axis of rotation and can be provided with multiple pattern bonding elements, which elements may be arranged in any suitable operative distribution. Such distributions of bonding elements are conventional and well known.
  • the individual pattern bonding elements can, for example, be pin elements, and the pin elements can have any suitable size, shape and/or cross- section.
  • the method and apparatus of the invention may cause a high deformation rate (length per length, per unit time), also referred to as deformation strain rate, during the relatively high-speed compression of local areas of the web materials as they pass through the nip between the anvil roller and the raised surfaces of the pattern roller. If the deformation rate is sufficiently high, the compressive mechanical deformation may induce an internal increase in temperature in the web material, and cause at least one of the web materials to soften or melt. Simultaneously, thermal conduction causes heat to be transferred away from the local areas of deformation in the deformed web material materials. As a result, the net temperature rise within the deformed web material will be determined by the difference between the internal heating due to the web deformation, and the heat loss due to thermal conduction.
  • the method and apparatus of the invention provides a rate of mechanical deformation or mechanical strain, which achieves a rate of internal heating that is significantly higher than the rate of heat loss due to thermal conduction.
  • induced internal heating is so rapid that only a small amount of heat is lost due to thermal conduction.
  • the internal heating process may be nearly adiabatic.
  • any auxiliary, pre-heating of the web material or bonding rollers may be dispensed with.
  • the deformation rate can be seen to increase non-linearly (cf. Equations 7 and 8) with respect to a decrease of the equivalent radius R e .
  • the deformation rate (length per length, per unit time) during the bonding compression of the web material materials can, for example, be less than 1 * 10 3 sec "1 .
  • thermal properties of the materials used in the bonding rollers Another factor that may be taken into consideration is the thermal properties of the materials used in the bonding rollers.
  • the choice of materials in the rollers can affect the rate of temperature increase produced in web materials being deformed, due to thermal conduction into the bonding rollers.
  • a relatively large thermal conductivity of the bonding rollers may cause a reduction of the temperature increase within the deformed materials of the web material.
  • bonding rollers having peripheral bonding surfaces made of steel instead of bonding rollers having peripheral surfaces made of copper the thermal conductivity is reduced and the performance of the method and apparatus of the invention is improved.
  • the bonding rollers assist in increasing the temperature of the deformed the web materials towards their softening and/or melting points in order to achieve a desired bonding strength.
  • Figure 1 shows a schematic illustration of an arrangement for carrying out the method according to the invention
  • Figure 2 shows a schematic illustration of an apparatus for carrying out the method according to the invention
  • Figure 3 shows a schematic cross-section of a pattern roller.
  • Figure 4 shows a diagram where the contact time t has been plotted over line speed V L .
  • Figures 5-8 show examples of patterns that may be imparted to an assembled web by a pattern roller
  • Figure 1 shows a schematic illustration of an arrangement for carrying out the bonding method according to the invention.
  • the arrangement and the bonding method has a lengthwise, machine-direction X which extends longitudinally in the direction of a bonded web, comprising at least two web materials, a lateral cross-direction Y which extends at right angles to the machine direction, transversely across the longitudinal direction of the bonded web, and a Z- direction at right angles to the X- and Y-directions.
  • the machine-direction X is the direction along which a particular component or material is transported lengthwise along and through a working zone of the apparatus.
  • the cross- direction Y lies generally parallel to the local horizontal, and is aligned perpendicular to the local machine-direction X.
  • the Z-direction is aligned substantially perpendicular to both the machine-direction X and the cross- direction Y, and extends generally along a depth-wise, thickness dimension of the appointed material targeted for work.
  • the bonding method and apparatus includes a delivering of a bonded web W 1 - having one or more selected bonding web materials W 1 , W 2 through a nip region 11 between at least one cooperating pair of rotatable bonding rollers RA, Rp, thereby forming and producing a bonded web W B .
  • a pattern roller R P is provided for imparting a sufficiently high-rate of shear deformation to the bonded web W ⁇ in order to achieve local melting and subsequent bonding of the individual web materials W 1 , W 2 as they pass the nip between the two rollers.
  • An anvil roller R A is provided to cooperate with the pattern roller R P to form the said nip.
  • the pattern roller R P is provided with a pattern surface speed and the anvil roller RA is provided with an anvil surface speed.
  • the anvil surface speed is preferably, but not necessarily, configured to be substantially equal to the pattern surface speed. This common surface speed will be referred to as the line speed V L .
  • the bonded web W ⁇ in Figure 1 is shown as comprising two bonding web materials W 1 , W 2 the method can be applied to bonded webs having multiple web materials.
  • the number of web materials to be joined is selected depending on the product to be manufactured and the type of materials to be included in the bonded web.
  • the power P A required to achieve sufficient bonding between the web materials fed through the nip between the rollers is determined by the melting temperature of each individual web material, the total thickness of the bonded web, the pattern of the pattern roller, the force F in the roller nip, the line speed VL and the equivalent roller radius R e .
  • the required power PA or the process in which the apparatus is used may require a relatively high line speed V L .
  • the materials in the bonded web may require a relatively low bonding pressure value, thus limiting the force F.
  • With a predetermined pattern on the pattern roller only the equivalent roller radius R e may be varied to achieve the required power P A .
  • the choice of web materials in the bonded web may put limitations on the maximum possible values for line speed V L and force F ih the roller nip.
  • a predetermined pattern on the pattern roller only the equivalent roller radius R e may be varied to achieve the required power P A .
  • the power PA can advantageously be adjusted by providing a pattern roller Rp and an anvil roller R A providing a roller combination with a suitable equivalent roller radius R e .
  • the power P A is adjusted by selecting a diameter D A for the anvil roller RA, wherein the diameter is selected so that the equivalent roller radius R e is equal to or less than 40 mm (see Equation 1 above).
  • the diameter D P of the pattern roller Rp may be up to 160 mm if the diameter D A of the anvil roller R A is selected equal to the diameter D P .
  • the diameter of, for instance, the anvil roller RA is decreased, then the diameter of the pattern roller Rp may be increased to any desired diameter, while maintaining the relationship of the equivalent roller radius R e being equal to or less than 40 mm, as required by the invention.
  • the relative diameters of the pattern roller R P and the anvil roller R A is selected depending on the required process parameters as outlined below.
  • the anvil roller R A used in the bonding method has a first diameter D A that is equal to or less than the respective second diameter D P of the pattern roller Rp.
  • the invention is not limited to this example.
  • the bonding method involves delivering the bonded web WT comprising selected web materials W 1 , W 2 to be bonded in a predetermined pattern through the nip region 11 between the pattern roller R P and the anvil roller R A to form a bonded web W B .
  • the web materials to be bonded include a first web Wi of a selected material and at least a second web W 2 of a selected material.
  • the diameter D A of the anvil roller R A may be selected to be equal to or less that the diameter D P of the pattern roller R P .
  • Figure 1 shows an arrangement where the diameter D A is less than the diameter D P .
  • FIG. 2 schematically indicates an arrangement 10 according to the invention, where a bonded web W ⁇ having one or more selected bonding web materials is passed through a nip region 11 between where the anvil roller R A and the pattern roller R P at a predetermined line speed V L .
  • the anvil roller R A is supported by two support rollers 12, 13.
  • Figure 3 shows a schematic cross-section of a pattern roller R P which has a diameter D P .
  • the pattern roller has a radius r P , or D P /2, and is provided with a pattern schematically illustrated by means of a number of single raised patterns
  • the pattern roller is arranged to cooperate with an anvil roller (not shown) in order to bond the bonded web WT comprising two bonding web materials W 1 , W 2 passed between the rollers at a predetermined line speed V L .
  • V( rP+h ) As the single pattern 31 contacts the target web W ⁇ it is moving at a peripheral speed V( rP+h ) and will compress the bonded web W ⁇ over a distance defined as a nip width b as the single pattern 31 is rotated through an angle ⁇ .
  • the deformation rate as the bonded web is compressed between the pattern on the pattern roller and the anvil roller is proportional to the contact time t, that is the time taken for the pattern to move across the nip width.
  • the anvil roller R A used in the bonding method has first diameter D A that is equal to or less than the respective second diameter D P of the pattern roller R P .
  • the relationship between the anvil roller and the pattern roller may be selected so that the equivalent radius R e is selected to be from 5 mm to 40 mm.
  • the equivalent radius R e is defined as the equivalent roller radius for a single roller on a flat surface. This radius is determined by the function shown in Equation 1 above.
  • the following examples describe particular configurations of the invention, and are presented to provide a more detailed understanding of the invention.
  • the examples are not intended to limit the scope of the present invention in any way. From a complete consideration of the entire disclosure, other arrangements within the scope of the claims will be readily apparent to one skilled in the art.
  • the examples involve joining two material webs comprising 90 g/m 2 spunbond polypropylene (PP), respectively, using a rotary bonding system as described in connection with Figure 2.
  • Support rollers were only used for the example using an anvil roller diameter D A of 20 mm..
  • the bonding process was carried out at an ambient temperature of 23 0 C.
  • Four roller combinations were employed using anvil and pattern roller diameters as indicated in Table 1.
  • the pressure bonding apparatus included a cooperating pair of bonding rollers provided by the representatively shown pattern roller RP and an anvil roller RA.
  • the anvil roller was substantially rotatably fixed on a base, and the pattern roller was configured to ride on the top of the anvil.
  • a forcing mechanism exerted a force which operatively urged the pattern roller towards the anvil roller.
  • the forcing mechanism was located at each end of the axis of the pattern roller and configured to exert a desired force in the direction shown in Figure 1.
  • the two rollers counter- rotated at surface speeds which were substantially equal to that of the two webs of target material moving forward through the bonder. The two material webs were bonded together when they passed through the nip region of the bonding system.
  • the forcing mechanism included pneumatic cylinders pressurized to the selected pressure values set forth in the present disclosure.
  • the pressurized cylinders would be controlled produce a desired linear pressure, or nip force value F.
  • the process parameters can be fixed by the materials to be bonded and/or a line speed determined by a process prior to or after the roller nip of the bonding rollers.
  • the line speed V L is constant and the required power P A for bonding is known for the material combination used
  • an anvil roller with a diameter D A up to 160 mm is preferable for the method according to the invention, where the preferred range for the equivalent radius R e is 5-40 mm.
  • the anvil roller diameter D A can be selected between 20 mm and 160 mm. Pattern roller diameters can be relatively large, as discussed above, and the desired effect is increased as the anvil roller diameter D A is decreased.
  • the nip force F can be reduced by reducing the equivalent radius Re. This can be done by reducing the diameter of both the anvil roller R A and the pattern roller R P .
  • the nip force F can be reduced by reducing the equivalent radius Re.
  • This can be done by reducing the diameter of both the anvil roller R A and the pattern roller R P .
  • due to the often complex surface geometry provided on the pattern roller R P it is more practical and less expensive to reduce the diameter of the anvil roller R A .
  • Pattern area speed An m 2 /s 0,005 0,005 0,005 0,005 0,005
  • Figure 4 shows a diagram where the contact time t has been plotted over the line speed V L .
  • the diagram indicates that the effect of invention is particularly noticeable at relatively low line speeds of about 100 m/min.
  • the diagram shows that choice of R e is significant to achieve desired result at low speed.
  • the deformation rate in the nip between the rollers is proportional to the contact time t.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention porte sur un procédé de fixation, comprenant la distribution d'une bande comprenant des matériaux choisis devant être assemblés selon un motif prédéterminé par passage à travers une région de pincement entre un rouleau à motif et un rouleau d'enclume de façon à former une bande assemblée. Le procédé comprend l'utilisation d'un rouleau d'enclume ayant un premier diamètre (DA) et d'un rouleau à motif ayant un second diamètre (DP), lequel rouleau à motif comporte des éléments de surface surélevés disposés selon un motif prédéterminé. Les rouleaux d'enclume et à motif ont un rayon équivalent (Re) inférieur ou égal à 40 mm, et provoquent une déformation mécanique de compression dans la région de pincement entre les rouleaux d'enclume et à motif à l'aide desdits éléments de surface surélevés de façon à induire un échauffement interne des matériaux de bande. La compression des matériaux de bande est effectuée à un taux de déformation suffisant pour provoquer une augmentation de température locale à l'intérieur des matériaux déformés du matériau de bande entre les éléments de surface surélevés et le rouleau d'enclume, de façon à provoquer ainsi une liaison entre les matériaux de bande.
PCT/SE2008/000704 2008-12-12 2008-12-12 Procédé et appareil pour la fixation WO2010068150A1 (fr)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8491742B2 (en) 2010-10-28 2013-07-23 The Procter And Gamble Company Method for embossing an absorbent article using a segmented anvil
US8496775B2 (en) 2010-10-28 2013-07-30 The Procter And Gamble Company Method for embossing an absorbent article
US8859842B2 (en) 2010-10-28 2014-10-14 The Procter & Gamble Company Embossed absorbent article
CN105584032A (zh) * 2014-11-12 2016-05-18 艾默生科技有限公司布兰森超声分公司 塑料焊接装置以及相应的塑料焊接方法
EP2662206A3 (fr) * 2012-05-08 2016-08-03 Valmet Technologies, Inc. Procédé et appareil pour régler la position de rouleaux dans la production de bande de matière fibreuse
WO2018160207A1 (fr) 2017-02-28 2018-09-07 Kimberly-Clark Worldwide, Inc. Matériaux élastiques à propriétés d'étirement directionnel
WO2019089689A2 (fr) 2017-10-31 2019-05-09 Kimberly-Clark Worldwide, Inc. Stratifiés élastiques présentant des parties élastiques incurvées et procédés de fabrication
WO2019125415A1 (fr) 2017-12-19 2019-06-27 Kimberly-Clark Worldwide, Inc. Articles absorbants comportant des châssis et des ceintures visuellement différents
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

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GB2261628A (en) * 1991-05-25 1993-05-26 Kannegiesser Martin Apparatus for bonding textile sheet-like structures
US20060266473A1 (en) * 2005-05-26 2006-11-30 Kimberly-Clark Worldwide, Inc. Bonding by induced high-rate of shear deformation
US20070137762A1 (en) * 2005-12-15 2007-06-21 Kimberly-Clark Worldwide, Inc. Method and apparatus for mechanically bonding material webs
US20070296104A1 (en) * 2005-10-20 2007-12-27 Shannon Thomas G High speed, pressure bonded, thin sheet laminate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261628A (en) * 1991-05-25 1993-05-26 Kannegiesser Martin Apparatus for bonding textile sheet-like structures
US20060266473A1 (en) * 2005-05-26 2006-11-30 Kimberly-Clark Worldwide, Inc. Bonding by induced high-rate of shear deformation
US20070296104A1 (en) * 2005-10-20 2007-12-27 Shannon Thomas G High speed, pressure bonded, thin sheet laminate
US20070137762A1 (en) * 2005-12-15 2007-06-21 Kimberly-Clark Worldwide, Inc. Method and apparatus for mechanically bonding material webs

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8491742B2 (en) 2010-10-28 2013-07-23 The Procter And Gamble Company Method for embossing an absorbent article using a segmented anvil
US8496775B2 (en) 2010-10-28 2013-07-30 The Procter And Gamble Company Method for embossing an absorbent article
US8859842B2 (en) 2010-10-28 2014-10-14 The Procter & Gamble Company Embossed absorbent article
EP2662206A3 (fr) * 2012-05-08 2016-08-03 Valmet Technologies, Inc. Procédé et appareil pour régler la position de rouleaux dans la production de bande de matière fibreuse
CN105584032A (zh) * 2014-11-12 2016-05-18 艾默生科技有限公司布兰森超声分公司 塑料焊接装置以及相应的塑料焊接方法
US10232555B2 (en) 2014-11-12 2019-03-19 Branson Ultraschall Niederlassung Der Emerson Technologies Gmbh & Co. Ohg Plastic welding device as well as respective plastic welding method
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
WO2018160207A1 (fr) 2017-02-28 2018-09-07 Kimberly-Clark Worldwide, Inc. Matériaux élastiques à propriétés d'étirement directionnel
WO2019089689A2 (fr) 2017-10-31 2019-05-09 Kimberly-Clark Worldwide, Inc. Stratifiés élastiques présentant des parties élastiques incurvées et procédés de fabrication
WO2019125415A1 (fr) 2017-12-19 2019-06-27 Kimberly-Clark Worldwide, Inc. Articles absorbants comportant des châssis et des ceintures visuellement différents

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