WO2009019723A1 - Device for ultrasonic welding, in particular of layered elements - Google Patents

Device for ultrasonic welding, in particular of layered elements Download PDF

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Publication number
WO2009019723A1
WO2009019723A1 PCT/IT2007/000562 IT2007000562W WO2009019723A1 WO 2009019723 A1 WO2009019723 A1 WO 2009019723A1 IT 2007000562 W IT2007000562 W IT 2007000562W WO 2009019723 A1 WO2009019723 A1 WO 2009019723A1
Authority
WO
WIPO (PCT)
Prior art keywords
sonotrode
layered elements
rotor
welding
contact
Prior art date
Application number
PCT/IT2007/000562
Other languages
French (fr)
Other versions
WO2009019723A9 (en
Inventor
Samuele Mazzini
Original Assignee
S.M.R.E. Engineering Di Mazzini S.& C. S.N.C.
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 S.M.R.E. Engineering Di Mazzini S.& C. S.N.C. filed Critical S.M.R.E. Engineering Di Mazzini S.& C. S.N.C.
Priority to PCT/IT2007/000562 priority Critical patent/WO2009019723A1/en
Publication of WO2009019723A1 publication Critical patent/WO2009019723A1/en
Publication of WO2009019723A9 publication Critical patent/WO2009019723A9/en

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Classifications

    • 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
    • B29C65/087—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 both a rotary sonotrode and 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
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/343—Making tension-free or wrinkle-free joints
    • B29C66/3432—Making tension-free or wrinkle-free joints by holding the material loose or tension-free 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
    • B29C66/01—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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial 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
    • B29C66/43—Joining a relatively small portion of the surface of said 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
    • B29C66/70—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
    • 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
    • B29C66/81427—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 comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81467—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint arranged in an offset pattern
    • 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
    • B29C66/80—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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/845—C-clamp type or sewing machine type
    • 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
    • B29C66/7232—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 non-plastics layer
    • B29C66/72321—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 non-plastics layer consisting of metals or their alloys
    • 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
    • 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
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    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • 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
    • 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
    • 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
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B29K2995/0069—Permeability to liquids; Adsorption non-permeable
    • 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
    • B29L2009/00—Layered products

Definitions

  • Figure 3 is a front view of the machine of the previous Figures 1 and 2;
  • each of the wheels 7 together with the rotor 5 forms a connecting zone 37 corresponding to a single welding zone for the layered elements 2.
  • the same single rotor 5 can react - relative to the layered element 2 feed time - practically simultaneously with all of the contact wheels 7, therefore multiplying the welding zones.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

A device (1) for ultrasonic welding of layered elements (2) made of flexible material comprises a welding head (3) with a sonotrode (4) which includes a rotor (5) mounted on a supporting base (6), and a sonotrode (4) contact wheel (7) on a head (3) upright (8). The sonotrode (4) and the contact wheel (7) being motor-driven so that they feed the layered elements (2) between them during welding. The device (1) comprises clutch-controlled traction means (9), positioned downstream of the sonotrode (4), designed to clamp the layered elements (2) and stretch them in the direction away from the welding head (3); and counter-reaction means (10) positioned between the welding head (3) and the traction means (9), designed to oppose the traction applied to the layered elements (2), preventing it from being transmitted as far as the sonotrode (4).

Description

Description
Device for ultrasonic welding, in particular of layered elements
Technical Field
The present invention relates to the ultrasonic welding of layered elements made of flexible materials and in particular it relates to a welding device.
Background Art
Ultrasonic welding technology has recently become popular for joining layered elements made of various types of materials.
The operating principle at the basis of this technology is that of obtaining the weld by local melting of the material (as in more conventional processes) but in which the heat necessary for melting is produced locally by the mechanical vibration at ultrasonic frequency of a sonotrode.
Said technique is widely used to join layered elements made of various types of materials, such as thermoplastics, fabrics, unwoven fabrics, and in general many materials which include a high level of polymers in their composition. For such materials it is possible to obtain not just strong, completely reliable welds, but also waterproof weld lines, which conventional joining techniques such as stitching could not otherwise provide.
Within the technology whose main outlines are referred to above, the prior art welding devices are designed in such a way as to basically comprise a mechanical structure having a welding head equipped with a rotor sonotrode which operates in combination with a contact wheel associated at its periphery. The contact wheel and the rotor are pressed against one another and rotate in a synchronised fashion. The layered elements to be joined, overlapping one another and inserted between the rotor and the contact wheel, are pressed by the rotor and the contact wheel and fed forward whilst the sonotrode vibration gradually welds them.
When this technology is used for some types of materials, above all of low production quality (for example certain low quality plastic materials used for truck tarpaulins) welding may be accompanied by differential and significant thermal expansions and contractions which vary unpredictably from one zone to another of the material and which occur during the welding process. When this happens, the welded joints are produced with a very low quality, because they do not guarantee a watertight seal and because they also often do not have an attractive appearance.
To overcome such disadvantages a solution developed by the Applicant involves applying controlled traction to the layers of material coming out of the welding station in such a way as to automatically compensate for the thermal expansions, consequently regularising the speed of material feed and formation of the weld beads.
Such a solution has improved many aspects of weld quality, but has also introduced another new disadvantage, since the sonotrode is negatively affected by me traction applied to the materials being processed and, when it proves excessive or very variable, may operate in an irregular fashion, which is again a source of disadvantages in terms of the regularity of processing and the final quality of the weld obtained.
Disclosure of the Invention The main aim of the invention is to overcome such disadvantages with a device that allows the production of welds with a high quality structure, watertight, and of excellent appearance, irrespective of the quality of the material processed, which may be of the lowest quality on sale.
Another aim of the invention is to carry out welding without affecting the regularity of sonotrode operation. The sonotrode may operate without interruptions or slowing in its operating cycle, benefiting productivity and low cost processing. The technical features of the invention, in accordance with said aims, are described in claim 1 and/or in any of the claims directly or indirectly dependent on it. Brief Description of the Drawings
Further features and advantages of the invention are described more clearly with reference to the accompanying drawings, in which:
Figure 1 is a perspective assembly view of a welding machine equipped with a device in accordance with the invention;
Figure 2 is an enlarged detail of the machine from Figure 1;
Figure 3 is a front view of the machine of the previous Figures 1 and 2;
Figure 4 is a schematic illustration of several details of the invention, with some parts cut away to better illustrate others; Figure 5 is a schematic illustration of an alternative embodiment of the machine, different to that of the previous figures;
Figure 6 and Figure 7 are respectively a schematic side elevation view and a schematic top plan view of the alternative embodiment of the machine of Figure 5;
Figure 8 is a schematic illustration of another alternative embodiment of the invention.
Detailed Description of the Preferred Embodiments of the Invention
With reference to the accompanying drawings, Figure 1 illustrates a welding machine labelled 30 as a whole, which uses ultrasonic welding to join layered elements consisting of flexible materials of various types, visible in Figure 4 and labelled 2.
The machine 30 basically comprises a base 31, mounted on top of which there is a monolithic structure, preferably made of sheet metal, basically consisting of a substantially horizontal bottom 32, an upright 33 and a substantially horizontal arm 34 supported cantilever-style above and parallel with the bottom 32.
Between the bottom 32 and the free end of the arm 34, the machine 30 comprises a welding device labelled 1 as a whole, more easily seen in Figure 2. hi particular, Figure 2 shows that the device 1 basically comprises a welding head 3 equipped with a sonotrode 4 and a sonotrode 4 contact wheel 7. The sonotrode 4 includes a rotor 5 mounted on a fixed supporting base 6 vertically supported by the bottom 32 of the machine 30 monolithic structure.
The sonotrode 4 contact wheel 7 is supported in a fixed position by a head 3 upright 8, suspended from the arm 34, and supported at the free end of the arm.
The circumferences of the sonotrode 4 rotor 5 and the contact wheel 7 are brought into contact with one another. They press against one another and are motor-driven so that they rotate in a suitably synchronised fashion.
In preparation for the welding, the layered elements 2 to be welded, positioned so that they overlap one another, are inserted and clamped between the rotor 5 and the wheel 7. The compression and motor-driven movement of the rotor 5 and the wheel 7 subject the layered elements 2 to compression, feed and simultaneous welding which is carried out during transit through the head 3. Said transit, in Figure 2, is from right to left.
Downstream of the sonotrode 4 according to the direction of feed of the layered elements 2, the device 1 also comprises clutch-controlled traction means 9, designed to clamp the layered elements 2 and stretch them in the direction away from the welding head 3. The device 1 also comprises counter-reaction means 10 positioned between the welding head 3 and the traction means 9.
More particularly, the clutch-controlled traction means 9, more easily seen in Figure 3, include gripping and traction grippers 26 for the layered elements 2 coming out of the welding head 3. More specifically, the grippers 26 include a pair of wheels 11 and 12 able to rotate about their own fixed centres of rotation, with clutch-controlled rotation. The wheels 11 and 12 make contact with one another radially, clamping the welded layered elements 2 between them as they come out of the welding head 3. The counter-reaction means 10 comprise a presser roller 18, reacting against the sonotrode 4 contact wheel 7 in such a way as to clamp in a direction 22 radial to the roller 18 and the contact wheel 7 (see Figure 4) the layered elements 2 between them, leaving them free to move in the direction 21, transversal to the clamping direction 22. The counter-reaction means 10 are such that they oppose the traction applied to the layered elements 2 by the clutch-controlled traction means 9, traction which is therefore prevented from being transmitted as far as the sonotrode 4 which in that way is advantageously unaffected by said traction and able to operate undisturbed in the best operating conditions. As shown in Figure 4, in their stretch between the counter-reaction means 10 and a zone 37 for mechanical and functional connection of the sonotrode 4 and the contact wheel 7, the layered elements 2 are slackened by the presence of a loop 35. This shows that the sonotrode 4 is not affected in any way by interference which could affect its correct operation and that the loop 35 simultaneously acts as a compensating storage unit, regulating layered element 2 feed even in the presence of locally variable expansions and contractions generated during welding.
The counter-reaction means 10 also allow immediate compression of the layered elements 2 just welded and still malleable, providing the double advantage of further compacting the weld: on one hand increasing the watertightness in subsequent use of the welded layered elements 2; and on the other hand regularising and further improving the surface quality and appearance.
Combined observation of Figure 3 and Figure 4 reveals that the upright 8 and the base 6 respectively support the contact wheel 7 and the sonotrode 4 rotor 5 with the respective axes 15 and 16 out of alignment. In other words, the sonotrode 4 and the contact wheel 7 have centres 13a and 13b which are aligned along a direction 14 at a slant to the axes 15 and 16. As well as allowing the same wheel 7 to operate as both the contact for the sonotrode 4 and the active subject of the counter-reaction means 10, this makes it possible to easily associate one or more additional contact wheels 7 with the rotor 5, as shown in Figure 4 and in Figures 5 and 6. If there are multiple contact wheels 7 and they are distributed along and on the outside of a peripheral arc of a sonotrode 4 rotor 5, each of the wheels 7 together with the rotor 5 forms a connecting zone 37 corresponding to a single welding zone for the layered elements 2. During the oscillation at the ultrasonic vibration, the same single rotor 5 can react - relative to the layered element 2 feed time - practically simultaneously with all of the contact wheels 7, therefore multiplying the welding zones.
Such structuring therefore means that, all other conditions being equal, it is possible to achieve a parallel increase in the production capacity of the welding head
3 according to a multiplication factor equal to the number of contact wheels 7 distributed around the rotor 5.
As well as the evident advantage of increasing the production potential of the welding head 3, this allows multiple welds and/or welds with different methods, without the need for a corresponding increase in welding head 3 power. An example of the creation of multiple parallel welds is schematically illustrated in Figure 6, where the wheels 7 positioned one after another along an arc of the rotor 5 are moved relative to one another, parallel with a sonotrode 4 rotor 5 axial direction 23, thus encountering, in combination with the rotor 5, corresponding separate adjacent bands 24 of the layered elements 2 delimited between parallel weld lines 36.
Figure 5 also shows how the contact wheels 7 may all have the same diameter. Moreover, said diameter does not necessarily have to be large. Therefore, assuming that the wheels 7 are made with a limited diameter, even a point, such as rollers or needles, it is possible to construct around the single rotor 5 of the welding sonotrode
4 a proper multiple weld arc 38.
The invention described above is susceptible of industrial application and may be modified and adapted in several ways without thereby departing from the scope of the inventive concept. Moreover, all details of the invention may be substituted by technically equivalent elements.

Claims

Claims
1. A device for ultrasonic welding of layered elements (2) made of flexible material, comprising a welding head (3) with a welding sonotrode (4) which includes a rotor (5) mounted on a supporting base (6), there being at least one sonotrode (4) contact wheel (7) on a head (3) upright (8), the sonotrode (4) and the contact wheel (7) being motor-driven so that during welding they feed the layered elements (2) inserted between them, the device (1) being characterised in that it comprises clutch-controlled traction means (9), positioned downstream of the sonotrode (4) and designed to clamp the layered elements (2) and stretch them in the direction away from the welding head (3); and counter-reaction means (10) positioned between the welding head (3) and the traction means (9), designed to oppose the traction applied to the layered elements (2), preventing it from being transmitted as far as the sonotrode (4).
2. The device according to claim 1, characterised in that the clutch-controlled traction means (9) include gripping and traction grippers (26) for the layered elements (2) coming out of the welding head (3).
3. The device according to claim 2, characterised in that the grippers (26) include a pair of wheels (11, 12) which rotate about fixed centres with clutch- controlled rotation, making contact with one another radially, between them there being the welded layered elements (2) coming out of the welding head (3).
4. The device according to any of the foregoing claims, characterised in that the upright (8) and the base (6) respectively support the one or each contact wheel (7) and the sonotrode (4) rotor (5) in such a way that the respective axes (15, 16) are out of alignment, the sonotrode (4) and the one or each contact wheel (7) having centres of rotation (13a, 13b) which are aligned along a direction (14) at a slant to the axes (15, 16).
5. The device according to claim 1, characterised in that the counter-reaction means (10) are associated with at least one of the contact wheels (7).
6. The device according to claim 5, characterised in that the counter-reaction means (10) comprise a presser roller (18) reacting against at least one sonotrode
(4) contact wheel (7) so as to clamp in a direction (22) radial to the roller (18) and to the contact wheel (7) the layered elements (2) between them, leaving them free to move in the direction (21) transversal to the radial direction (22).
7. The device according to any of the foregoing claims, characterised in that it comprises at least two sonotrode (4) contact wheels (7) distributed along the periphery of the sonotrode (4).
8. The device according to any of the foregoing claims, characterised in that said at least two contact wheels (7) are moved parallel with a sonotrode (4) rotor
(5) axial direction (23), thus encountering, in combination with the rotor (5), corresponding separate adjacent bands (24) of the layered elements (2) delimiting them with equidistant weld lines (36).
9. The device according to any of the foregoing claims, characterised in that said at least two contact wheels (7) have substantially equal diameters.
10. The device according to any of the foregoing claims, characterised in that there are multiple contact wheels (7) and they are distributed along a peripheral arc of a single sonotrode rotor (5), the contact wheels (7) and the rotor (5) forming multiple connecting zones (37) corresponding with as many layered element (2) ultrasonic welding zones.
11. The device according to claim 10, characterised in that it comprises an arc (38) for multiple support of the contact wheels (7) about the rotor (5).
12. The device according to any of the foregoing claims, characterised in that it creates continuous welds on the layered elements (2).
PCT/IT2007/000562 2007-08-03 2007-08-03 Device for ultrasonic welding, in particular of layered elements WO2009019723A1 (en)

Priority Applications (1)

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PCT/IT2007/000562 WO2009019723A1 (en) 2007-08-03 2007-08-03 Device for ultrasonic welding, in particular of layered elements

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN110328858A (en) * 2019-05-29 2019-10-15 佛山市迪安通讯设备有限公司 A kind of hot pressure equipment for hanging antenna oscillator piece for room bulkhead

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CN107243689B (en) * 2017-07-04 2019-02-15 安徽华生机电设备有限公司 A kind of wave welding head of ultrasonic wave centering support frame

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WO1998028123A1 (en) * 1996-12-20 1998-07-02 Kimberly-Clark Worldwide, Inc. Method and apparatus for full width ultrasonic bonding
DE10126866A1 (en) * 2001-06-01 2002-12-19 Kuesters Eduard Maschf Ultrasonic consolidation of a continuously moving thermoplastic fleece strip, uses a pressure roll to hold strip firmly against an opposing roll below a sonic horn
JP2003131347A (en) * 2001-10-23 2003-05-09 Fujishiro:Kk Sealing device and method for sealing packaging body
WO2006029835A1 (en) * 2004-09-14 2006-03-23 Jentschmann Ag Zürich A welding device
WO2006087224A1 (en) * 2005-02-18 2006-08-24 Jentschmann Ag Zürich Ultrasonic welding device for forming welded seams on textiles

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SU1243955A1 (en) * 1984-12-17 1986-07-15 Омский политехнический институт Device for ultrasonic welding of thermoplastic materials
WO1998028123A1 (en) * 1996-12-20 1998-07-02 Kimberly-Clark Worldwide, Inc. Method and apparatus for full width ultrasonic bonding
DE10126866A1 (en) * 2001-06-01 2002-12-19 Kuesters Eduard Maschf Ultrasonic consolidation of a continuously moving thermoplastic fleece strip, uses a pressure roll to hold strip firmly against an opposing roll below a sonic horn
JP2003131347A (en) * 2001-10-23 2003-05-09 Fujishiro:Kk Sealing device and method for sealing packaging body
WO2006029835A1 (en) * 2004-09-14 2006-03-23 Jentschmann Ag Zürich A welding device
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CN110328858A (en) * 2019-05-29 2019-10-15 佛山市迪安通讯设备有限公司 A kind of hot pressure equipment for hanging antenna oscillator piece for room bulkhead

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