WO2003097332A1 - Device for welding packaging material - Google Patents

Device for welding packaging material Download PDF

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Publication number
WO2003097332A1
WO2003097332A1 PCT/CH2003/000314 CH0300314W WO03097332A1 WO 2003097332 A1 WO2003097332 A1 WO 2003097332A1 CH 0300314 W CH0300314 W CH 0300314W WO 03097332 A1 WO03097332 A1 WO 03097332A1
Authority
WO
WIPO (PCT)
Prior art keywords
packaging material
magnetic field
welding
slot
inductor
Prior art date
Application number
PCT/CH2003/000314
Other languages
French (fr)
Inventor
Jacques Thomasset
Mathieu Benoit
Original Assignee
Aisapack Holding Sa
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 Aisapack Holding Sa filed Critical Aisapack Holding Sa
Priority to AU2003221585A priority Critical patent/AU2003221585A1/en
Publication of WO2003097332A1 publication Critical patent/WO2003097332A1/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
    • 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
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • B29C53/50—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively using internal forming surfaces, e.g. mandrels
    • 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
    • B29C66/43—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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0007—Insulating
    • 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
    • B29L2009/003—Layered products comprising a metal layer

Definitions

  • the present invention relates to a welding device for packaging material.
  • the packaging material consists of at least one layer of thermoplastic material and one layer which can be heated by electromagnetic induction (eg metallic or polymer-based).
  • the device includes an alternating current generator and a coil (inductor) to transform the alternating current into a magnetic field.
  • the lines of the magnetic field are oriented so as to pass through the packaging material, thus generating eddy currents in the metal layer, the heat resulting from this phenomenon is used to melt a portion (the welding area) of the layer into thermoplastic material.
  • the magnetic field loops generated by the coil are only partially channeled using ferromagnetic elements.
  • certain magnetic field lines pass through the packaging material at locations which do not correspond to the welding area. Heating these uncontrolled regions can cause deformations in the packaging material, e.g. ex. ripples.
  • the present invention has the merit of remedying in particular the aforementioned problem by providing more targeted heating at the level of the welding zone. It relates in particular to a device for welding a packaging material comprising a layer which can be heated by electromagnetic induction (eg metallic or based on polymer) and a layer of thermoplastic material incorporating a welding zone.
  • electromagnetic induction eg metallic or based on polymer
  • the welding device comprising an alternating current generator, a coil for transforming the alternating current into a magnetic field, a ferromagnetic element for channeling the lines of the magnetic field in a determined direction, the magnetic field being oriented so as to pass through the packaging material to induce heating of the layer which can be heated by electromagnetic induction;
  • the welding device is distinguished in particular by the fact that it comprises a set of insulating elements with respect to the magnetic field and conductive elements of the magnetic field, the elements being arranged to channel the flux in the zone to be heated.
  • the packaging material 7 is positioned between a portion 9 of a welding rod (not shown) and an inductor 12, said portion 9 consists of an insulating material with respect to the magnetic field and comprises a longitudinal slot 3 arranged in the main direction of the rod and sinking perpendicularly to the area of the packaging material 7 to be heated.
  • the packaging material 7 is immobile or slides on the surface 1 of the insulating material 9.
  • a ferromagnetic element 13 is positioned in the slot 3 in order to attract the magnetic flux through the packaging material 7, and thus to heat the packaging material with less energy.
  • the addition of the ferromagnetic element 13 makes it possible to weld the packaging with a reduced power.
  • the ferromagnetic element 13 positioned in the slot does not necessarily occupy the entire volume of the slot 3.
  • the ferromagnetic element 13 (ferrite) occupies only part of the depth of the slot 3 and part of its width.
  • the part of the width of the slot which is not occupied by the ferromagnetic element 13 is filled with a magnetically insulating material 5, which amounts to forming inside the first slot, a second reduced width slot.
  • a plate 6 is positioned in the slot 3 in order to separate the ferromagnetic element 13 from the packaging material 7.
  • the plate 6 is in contact with the packaging material 7 in the heated zone . It is made of a material permeable to the magnetic field. It is also electrically insulating, thermally conductive and has a low coefficient of friction. The plate 6 can be eliminated when the ferromagnetic element 13 is close to the surface and the friction with the packaging material 7 is reduced.
  • the lower side 2 of the inductor 12 is composed of a magnetically insulating material. It comprises a slot 4 arranged in the extension of the slot 3 of the rod portion 9.
  • the length and the width of the slot 4 of the inductor 12 generally being less than or equal to the length and the width of the slot 3 of the stem portion 9.
  • a ferromagnetic element 10 is positioned in the slot 4 in order to orient the magnetic flux perpendicular to the packaging material 7 and reduce the power necessary for welding.
  • the ferromagnetic element 10 occupies the entire surface of the slot 4.
  • a wafer 11 is positioned in the slot 4 in order to separate the ferromagnetic material 10 from the packaging material 7.
  • the wafer 11 is in contact with the packaging material 7 in the heated zone. It is composed of a material permeable to the magnetic field, electrically insulating, thermally conductive and having a low coefficient of friction.
  • the plate 11 can be eliminated when the ferromagnetic element 10 is close to the surface 2 and when the friction with the packaging material 7 is reduced.
  • the surfaces 1 and 2 are distant from the thickness of the packaging material 7 to be welded, increased by a functional clearance, the latter being understood between 0 and 1000 microns and preferably between 25 and 250 microns for a continuous welding process.
  • the two slots 3 and 4 can be offset transversely, the transverse offset being less than or equal to the sum of the width of the slots 3,4, and preferably less than or equal to the sum of the half width of the slots 3.4.
  • the distance separating the ferromagnetic elements 10,13 from the packaging material 7 can be varied by modifying the thickness of the plates 6,11. According to the invention, the distance separating the ferromagnetic elements 10,13 from the package varies between 0 and 10 mm, and preferably between 0.1 mm and 3 mm.
  • the relative position of the ferromagnetic elements 10,13 with respect to the packaging material 7 allows asymmetric heating of the upper and lower sheets of the packaging material 7 to be assembled. Thus, if the packaging material 7 is closer to the upper ferromagnetic element 10, the upper sheet of the packaging material 7 will be more heated than the lower sheet.

Abstract

The invention concerns a device for welding tubes comprising a field winding (12) and a welding rod, characterized in that at least the portion (9) of the outer part of the welding rod located beneath the field coil (12) is made of a material which blocks the magnetic field, said portion (9) comprising a longitudinal slot (3) for channelling the magnetic field lines generated by the field winding (12).

Description

Dispositif de soudage pour matériau d'emballage Welding device for packaging material
Domaine de l'invention La présente invention se rapporte à un dispositif de soudage pour matériau d'emballage. Le matériau d'emballage est constitué d'au moins une couche de matière thermoplastique et d'une couche que l'on peut chauffer par induction électromagnétique (p. ex. métallique ou à base de polymère). Le dispositif comprend un générateur de courant alternatif et une bobine (inducteur) pour transformer le courant alternatif en un champ magnétique. Les lignes du champ magnétique sont orientées de manière à traverser le matériau d'emballage, générant ainsi des courants de Foucault dans la couche métallique, la chaleur résultant de ce phénomène est utilisée pour fondre une portion (la zone de soudage) de la couche en matière thermoplastique.Field of the Invention The present invention relates to a welding device for packaging material. The packaging material consists of at least one layer of thermoplastic material and one layer which can be heated by electromagnetic induction (eg metallic or polymer-based). The device includes an alternating current generator and a coil (inductor) to transform the alternating current into a magnetic field. The lines of the magnetic field are oriented so as to pass through the packaging material, thus generating eddy currents in the metal layer, the heat resulting from this phenomenon is used to melt a portion (the welding area) of the layer into thermoplastic material.
Etat de la techniqueState of the art
Dans les dispositifs de l'état de la technique, les boucles de champ magnétique générées par la bobine ne sont que partiellement canalisées à l'aide d'éléments ferromagnétiques. Il en résulte que certaines lignes de champ magnétique traversent le matériau d'emballage en des endroits qui ne correspondent pas à la zone de soudage. Le chauffage de ces régions incontrôlées peut engendrer des déformations dans le matériau d'emballage, p. ex. des ondulations.In the devices of the prior art, the magnetic field loops generated by the coil are only partially channeled using ferromagnetic elements. As a result, certain magnetic field lines pass through the packaging material at locations which do not correspond to the welding area. Heating these uncontrolled regions can cause deformations in the packaging material, e.g. ex. ripples.
Résumé de l'invention La présente invention, telle que définie à la revendication 1 , a le mérite de remédier notamment au problème précité en offrant un chauffage plus ciblé au niveau de la zone de soudage. Elle concerne en particulier un dispositif de soudage d'un matériau d'emballage comprenant une couche que l'on peut chauffer par induction électromagnétique (p.ex. métallique ou à base de polymère) et une couche de matière thermoplastique incorporant une zone de soudage qui s'étend selon la direction du déplacement du matériau d'emballage; le dispositif de soudage comprenant un générateur de courant alternatif, une bobine pour transformer le courant alternatif en un champ magnétique, un élément ferromagnétique pour canaliser les lignes du champ magnétique selon une direction déterminée, le champ magnétique étant orienté de manière à traverser le matériau d'emballage pour induire un chauffage de la couche que l'on peut chauffer par induction électromagnétique; le dispositif de soudage se distingue notamment par le fait qu'il comprend un ensemble d'éléments isolants vis à vis du champ magnétique et d'éléments conducteur du champs magnétique, les éléments étant disposés pour canaliser le flux dans la zone à chauffer.Summary of the invention The present invention, as defined in claim 1, has the merit of remedying in particular the aforementioned problem by providing more targeted heating at the level of the welding zone. It relates in particular to a device for welding a packaging material comprising a layer which can be heated by electromagnetic induction (eg metallic or based on polymer) and a layer of thermoplastic material incorporating a welding zone. which extends in the direction of movement of the packaging material; the welding device comprising an alternating current generator, a coil for transforming the alternating current into a magnetic field, a ferromagnetic element for channeling the lines of the magnetic field in a determined direction, the magnetic field being oriented so as to pass through the packaging material to induce heating of the layer which can be heated by electromagnetic induction; the welding device is distinguished in particular by the fact that it comprises a set of insulating elements with respect to the magnetic field and conductive elements of the magnetic field, the elements being arranged to channel the flux in the zone to be heated.
Comme on le verra par la suite, le chauffage localisé est particulièrement avantageux.As will be seen later, localized heating is particularly advantageous.
Selon le mode de réalisation de l'invention illustré sur l'unique figure, le matériau d'emballage 7 est positionné entre une portion 9 d'une tige de soudage (non illustrée) et un inducteur 12, ladite portion 9 est constituée d'un matériau isolant vis à vis du champ magnétique et comprend une fente longitudinale 3 disposée selon la direction principale de la tige et s'enfonçant perpendiculairement par rapport à la zone du matériau d'emballage 7 à chauffer.According to the embodiment of the invention illustrated in the single figure, the packaging material 7 is positioned between a portion 9 of a welding rod (not shown) and an inductor 12, said portion 9 consists of an insulating material with respect to the magnetic field and comprises a longitudinal slot 3 arranged in the main direction of the rod and sinking perpendicularly to the area of the packaging material 7 to be heated.
Le matériau d'emballage 7 est immobile ou glisse sur la surface 1 du matériau isolant 9.The packaging material 7 is immobile or slides on the surface 1 of the insulating material 9.
Un élément ferromagnétique 13 est positionné dans la fente 3 afin d'attirer le flux magnétique au travers du matériau d'emballage 7, et ainsi de chauffer le matériau d'emballage avec moins d'énergie. L'ajout de l'élément ferromagnétique 13 permet de souder l'emballage avec une puissance plus réduite. L'élément ferromagnétique 13 positionné dans la fente n'occupe pas nécessairement tout le volume de la fente 3. Selon le mode illustré de l'invention, l'élément ferromagnétique 13 (ferrite) occupe seulement une partie de la profondeur de la fente 3 et une partie de sa largeur. Selon ce mode préférentiel, la partie de la largeur de la fente qui n'est pas occupée par l'élément ferromagnétique 13 est remplie avec un matériau isolant magnétiquement 5, ce qui revient à former à l'intérieur de la première fente, une deuxième fente de largeur réduite. Selon le mode préférentiel de l'invention, une plaquette 6 est positionnée dans la fente 3 afin de séparer l'élément ferromagnétique 13 du matériau d'emballage 7. La plaquette 6 est en contact avec le matériau d'emballage 7 dans la zone chauffée. Elle est composée d'un matériau perméable au champ magnétique. Elle est en outre isolante électriquement, conductrice thermiquement et possède un faible coefficient de frottement. La plaquette 6 peut être supprimée quand l'élément ferromagnétique 13 est proche de la surface et que les frottements avec le matériau d'emballage 7 sont réduits.A ferromagnetic element 13 is positioned in the slot 3 in order to attract the magnetic flux through the packaging material 7, and thus to heat the packaging material with less energy. The addition of the ferromagnetic element 13 makes it possible to weld the packaging with a reduced power. The ferromagnetic element 13 positioned in the slot does not necessarily occupy the entire volume of the slot 3. According to the illustrated mode of the invention, the ferromagnetic element 13 (ferrite) occupies only part of the depth of the slot 3 and part of its width. According to this preferred embodiment, the part of the width of the slot which is not occupied by the ferromagnetic element 13 is filled with a magnetically insulating material 5, which amounts to forming inside the first slot, a second reduced width slot. According to the preferred embodiment of the invention, a plate 6 is positioned in the slot 3 in order to separate the ferromagnetic element 13 from the packaging material 7. The plate 6 is in contact with the packaging material 7 in the heated zone . It is made of a material permeable to the magnetic field. It is also electrically insulating, thermally conductive and has a low coefficient of friction. The plate 6 can be eliminated when the ferromagnetic element 13 is close to the surface and the friction with the packaging material 7 is reduced.
Le côté inférieur 2 de l'inducteur 12 est composé d'un matériau isolant magnétiquement. Il comporte une fente 4 disposée dans le prolongement de la fente 3 de la portion de tige 9. La longueur et la largeur la fente 4 de l'inducteur 12 étant généralement inférieures ou égales à la longueur et la largeur de la fente 3 de la portion de tige 9.The lower side 2 of the inductor 12 is composed of a magnetically insulating material. It comprises a slot 4 arranged in the extension of the slot 3 of the rod portion 9. The length and the width of the slot 4 of the inductor 12 generally being less than or equal to the length and the width of the slot 3 of the stem portion 9.
Un élément ferromagnétique 10 est positionné dans la fente 4 afin d'orienter le flux magnétique perpendiculairement au matériau d'emballage 7 et diminuer la puissance nécessaire pour souder. De préférence, l'élément ferromagnétique 10 occupe toute la surface de la fente 4.A ferromagnetic element 10 is positioned in the slot 4 in order to orient the magnetic flux perpendicular to the packaging material 7 and reduce the power necessary for welding. Preferably, the ferromagnetic element 10 occupies the entire surface of the slot 4.
Une plaquette 11 est positionnée dans la fente 4 afin de séparer le matériau ferromagnétique 10 du matériau d'emballage 7. La plaquette 11 est en contact avec le matériau d'emballage 7 dans la zone chauffée. Elle est composée d'une matière perméable au champ magnétique, isolante électriquement, conductrice thermiquement et ayant un faible coefficient de frottement. La plaquette 11 peut être supprimée quand l'élément ferromagnétique 10 est proche de la surface 2 et que les frottements avec le matériau d'emballage 7 sont réduits.A wafer 11 is positioned in the slot 4 in order to separate the ferromagnetic material 10 from the packaging material 7. The wafer 11 is in contact with the packaging material 7 in the heated zone. It is composed of a material permeable to the magnetic field, electrically insulating, thermally conductive and having a low coefficient of friction. The plate 11 can be eliminated when the ferromagnetic element 10 is close to the surface 2 and when the friction with the packaging material 7 is reduced.
Selon l'invention, les surfaces 1 et 2 sont distantes de l'épaisseur du matériau d'emballage 7 à souder, augmentée d'un jeu fonctionnel, ce dernier étant compris entre 0 et 1000 microns et de préférence entre 25 et 250 microns pour un procédé de soudage en continu.According to the invention, the surfaces 1 and 2 are distant from the thickness of the packaging material 7 to be welded, increased by a functional clearance, the latter being understood between 0 and 1000 microns and preferably between 25 and 250 microns for a continuous welding process.
Selon l'invention, les deux fentes 3 et 4 peuvent être décalées transversalement, le décalage transversal étant inférieur ou égal à la somme de la largeur des fentes 3,4, et de préférence inférieur ou égal à la somme de la demi largeur des fentes 3,4.According to the invention, the two slots 3 and 4 can be offset transversely, the transverse offset being less than or equal to the sum of the width of the slots 3,4, and preferably less than or equal to the sum of the half width of the slots 3.4.
La distance séparant les éléments ferromagnétiques 10,13 du matériau d'emballage 7 peut être variée en modifiant l'épaisseur des plaquettes 6,11. Selon l'invention la distance séparant les éléments ferromagnétiques 10,13 de l'emballage varie entre 0 et 10 mm, et de préférence entre 0,1 mm et 3 mm. La position relative des éléments ferromagnétiques 10,13 vis à vis du matériau d'emballage 7 permet d'avoir un chauffage dissymétrique des feuilles supérieure et inférieure du matériau d'emballage 7 à assembler. Ainsi, si le matériau d'emballage 7 est plus proche de l'élément ferromagnétique supérieur 10, la feuille supérieure du matériau d'emballage 7 sera plus chauffée que la feuille inférieure. The distance separating the ferromagnetic elements 10,13 from the packaging material 7 can be varied by modifying the thickness of the plates 6,11. According to the invention, the distance separating the ferromagnetic elements 10,13 from the package varies between 0 and 10 mm, and preferably between 0.1 mm and 3 mm. The relative position of the ferromagnetic elements 10,13 with respect to the packaging material 7 allows asymmetric heating of the upper and lower sheets of the packaging material 7 to be assembled. Thus, if the packaging material 7 is closer to the upper ferromagnetic element 10, the upper sheet of the packaging material 7 will be more heated than the lower sheet.

Claims

Revendicationsclaims
Dispositif de soudage pour tubes comprenant un inducteur (12) et une tige de soudage, caractérisé par le fait qu'au moins la portion (9) de la partie externe de la tige de soudage située sous l'inducteur (12) est constituée d'un matériau qui bloque le champ magnétique, ladite portion (9) comprenant une fente longitudinale (3) destinée à canaliser les lignes du champ magnétique générées par l'inducteur (12).Welding device for tubes comprising an inductor (12) and a welding rod, characterized in that at least the portion (9) of the external part of the welding rod located under the inductor (12) consists of 'a material which blocks the magnetic field, said portion (9) comprising a longitudinal slot (3) intended to channel the lines of the magnetic field generated by the inductor (12).
Dispositif selon la revendication 1 caractérisé en ce que ladite fente longitudinale (3) comprend un élément ferromagnétique (13).Device according to claim 1 characterized in that said longitudinal slot (3) comprises a ferromagnetic element (13).
3. Dispositif selon la revendication 2 caractérisé en ce que ladite fente longitudinale (3) comprend en outre un élément (5) qui bloque le champ magnétique.3. Device according to claim 2 characterized in that said longitudinal slot (3) further comprises an element (5) which blocks the magnetic field.
4. Dispositif selon la revendication 1 ou caractérisé en ce que ladite fente longitudinale (3) comprend en outre un élément (6) transparent au champ magnétique, ledit élément transparent (6) étant disposé entre ledit élément ferromagnétique (13) et l'inducteur (12). 4. Device according to claim 1 or characterized in that said longitudinal slot (3) further comprises an element (6) transparent to the magnetic field, said transparent element (6) being disposed between said ferromagnetic element (13) and the inductor (12).
PCT/CH2003/000314 2002-05-21 2003-05-15 Device for welding packaging material WO2003097332A1 (en)

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WO2016083212A1 (en) * 2014-11-24 2016-06-02 Tetra Laval Holdings & Finance S.A. Simplified transversal induction sealing device
US10358243B2 (en) 2014-04-16 2019-07-23 Tetra Laval Holdings & Finance S.A. Induction sealing device and method of sealing a packaging material using said induction sealing device
US10899082B2 (en) 2017-07-17 2021-01-26 Tetra Laval Holdings & Finance S.A. Inductor coil for induction welding of a packaging material
US10994495B2 (en) 2015-11-27 2021-05-04 Tetra Laval Holdings & Finance S.A. Sealing device with increased robustness
US11370571B2 (en) 2017-07-18 2022-06-28 Tetra Laval Holdings & Finance S.A. Induction sealing device
US11534985B2 (en) 2016-05-02 2022-12-27 Tetra Laval Holdings & Finance S.A. Induction sealing system
US11548238B2 (en) 2018-09-10 2023-01-10 Tetra Laval Holdings & Finance S.A. Method for forming a tube and a method and a packaging machine for forming a package
US11554555B2 (en) 2017-05-30 2023-01-17 Tetra Laval Holdings & Finance S.A. Apparatus for sealing the top of a package for a food product and system for forming and filling a food package
US11820540B2 (en) 2018-09-11 2023-11-21 Tetra Laval Holdings & Finance S.A. Packaging apparatus for forming sealed packages

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
US10358243B2 (en) 2014-04-16 2019-07-23 Tetra Laval Holdings & Finance S.A. Induction sealing device and method of sealing a packaging material using said induction sealing device
WO2016083212A1 (en) * 2014-11-24 2016-06-02 Tetra Laval Holdings & Finance S.A. Simplified transversal induction sealing device
JP2018503533A (en) * 2014-11-24 2018-02-08 テトラ ラバル ホールディングス アンド ファイナンス エス エイ Simplified lateral induction seal device
US10350832B2 (en) 2014-11-24 2019-07-16 Tetra Laval Holdings & Finance S.A. Simplified transversal induction sealing device
US10994495B2 (en) 2015-11-27 2021-05-04 Tetra Laval Holdings & Finance S.A. Sealing device with increased robustness
US11534985B2 (en) 2016-05-02 2022-12-27 Tetra Laval Holdings & Finance S.A. Induction sealing system
US11554555B2 (en) 2017-05-30 2023-01-17 Tetra Laval Holdings & Finance S.A. Apparatus for sealing the top of a package for a food product and system for forming and filling a food package
US10899082B2 (en) 2017-07-17 2021-01-26 Tetra Laval Holdings & Finance S.A. Inductor coil for induction welding of a packaging material
US11370571B2 (en) 2017-07-18 2022-06-28 Tetra Laval Holdings & Finance S.A. Induction sealing device
US11548238B2 (en) 2018-09-10 2023-01-10 Tetra Laval Holdings & Finance S.A. Method for forming a tube and a method and a packaging machine for forming a package
US11820540B2 (en) 2018-09-11 2023-11-21 Tetra Laval Holdings & Finance S.A. Packaging apparatus for forming sealed packages

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