WO1997022523A1 - A method and device for accomplishing a joint of polymer lined aluminium - Google Patents

A method and device for accomplishing a joint of polymer lined aluminium Download PDF

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Publication number
WO1997022523A1
WO1997022523A1 PCT/SE1996/001703 SE9601703W WO9722523A1 WO 1997022523 A1 WO1997022523 A1 WO 1997022523A1 SE 9601703 W SE9601703 W SE 9601703W WO 9722523 A1 WO9722523 A1 WO 9722523A1
Authority
WO
WIPO (PCT)
Prior art keywords
inductor
joint
current
laid
accomplishing
Prior art date
Application number
PCT/SE1996/001703
Other languages
French (fr)
Inventor
Anders Hilmersson
Gert Holmström
Håkan ANDERSSON
Original Assignee
Tetra Laval Holdings & Finance S.A.
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 Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU12186/97A priority Critical patent/AU1218697A/en
Publication of WO1997022523A1 publication Critical patent/WO1997022523A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • 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
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • 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
    • B29C65/3644—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 ribbon, band or strip
    • 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
    • B29C66/01—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
    • 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
    • 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
    • B29C66/49—Internally supporting the, e.g. tubular, article 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
    • B29C66/70—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
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—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
    • B29C66/832—Reciprocating joining or pressing tools

Definitions

  • the present invention relates to a method and a device for accomplishing a joint of polymer lined aluminium with induction heat.
  • a method and a device according to the invention can especially be utilized at longitudinal joint sealing of a packaging blank for the formation of a cylindrical or frusto-conical barrel part for a packaging, but other uti ⁇ lizations are also possible.
  • FIG. 1 in perspective illustrates the cooperation bet ⁇ ween a packaging blank with frusto-conical shape and an in ⁇ ductor beam for accomplishing a longitudinal joint in the packaging blank
  • Fig 2 is a side view, namely from the right, of the arrangement shown in Fig 1 with an inductor according to the invention
  • Fig 3 is a plan view of the device according to Fig 2,
  • Fig 4 is an end view from the left of the device according to Fig 3,
  • Fig 5 is a simplified section along the line V-V in Fig 3
  • Fig 6 is a plan view to a reduced scale of a mandrel for use together with the inductor beam shown in Figs 1 - 5.
  • a frusto-conical packaging blank 1 shall - starting from a planar sheet - be given the conical shape shown in the drawings and be provided with a longitudinal joint in the way defined by the invention, whereupon it can be equipped with a bottom and a cover in a way not further shown or described here.
  • the packaging blank 1 is preferably made of aluminium with a thickness of 50 - 300 ⁇ , for example 85 ⁇ m.
  • the aluminium surface is at least on one side lined with a sealable polymer, for example a polyester, but often on both sides.
  • an inductor beam 2 is used and as dolly a mandrel 3 indicated in Fig 6 and for example made of fabric reinforced bakelite.
  • Special problems are encountered at sealing compara ⁇ tively thick polymer lined aluminium with induction heat, above all due to the low resistance and high heat conduc ⁇ ting ability of the material.
  • the current in the inductor and accompanying matching transformer becomes unacceptably high with normal inductors having only one turn.
  • the problem is further complicated at longitudinal joints, where the induced current shall follow the edge of the material as far as possible and then promptly turn.
  • use is instead made of an inductor having several windings, prefe ⁇ rably an inductor with five turns.
  • a litz wire contains a large number of conductors isolated from each other, in the present case about 400 conductors within a total diame ⁇ ter of 2 mm, and thus accomplishes an even distribution of the current in the wire.
  • the I-beam shape is chosen for enabling the applica- tion of the pressure on the joint necessary for the sealing, and the litz wires 5 are laid in the web of the I- beam for concentrating the current and accomplishing the heat necessary for rapid melting and sealing.
  • the I-beam 4 with its litz wires 5 is laid into a ferritic mass for con- centrating the current. At a sealing of 85 ⁇ m aluminium sealing times of 30 - 300 ms can be accomplished.
  • All the return conductors of litz wire 5 (to the left in Figs 4 and 5) are laid next to each other under a copper plate 6 in the inner surface of the inductor beam for the purpose of distributing the current.
  • the inductor beam 2 can be provided with screw holes 2' for its mounting at the machine (not shown) for the sealing.
  • the heat is normally developped in the metal layer closest to the inductor.
  • This zone must then be free from decoration in the same way as at steel cans and the like with welded longitudinal joint. If the members of the longitudinal joint however are laid m the way which appears from Figs 4 and 5, i e if the member on which the return litz wires 5 and the copper plate 6 are applied is laid lowest in the joint, both the sealing current and the return current will pass through the lower member, which means that the heat will be con ⁇ centrated to the lower plate layer.
  • a copper strip 7 (Fig 6) is arranged on the mandrel or dolly 3 at the back side of the packaging blank 1 in the vicinity of the place where the current turns.
  • a strip 7 is m its longitudinal direc ⁇ tion displaced a few mm mside the end of the longitudinal joint. It will take care of the turning current and will relieve the joint.
  • Such a strip 7 is normally arranged at each end of the longitudinal joint. It can however also occur that the packaging is provided with a cover before the longitudinal joint, and in such case it suffices with one strip 7 at the free end of the joint.
  • Another way of accomplishing the desired effect with current concentration and pressure application ability s to use an inductor in the form of a number, for example five, next to each other standing but from each other iso ⁇ lated copper rods, each with a height of 4 - 5 mm and a thickness of 0.8 mm.
  • these copper rods can be turned 90° and be placed at a certain distance from each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

In order to accomplish a longitudinal joint of polymer lined aluminium with induction heat the current in an inductor (2) at the joint can be concentrated in that several parallel current conducting conductors (4, 5) are laid next to each other. Especially, four litz wires (5) can be laid in the web of an I-beam (4), which constitutes a fifth conductor and a means for applying pressure on the joint.

Description

A METHOD AND DEVICE FOR ACCOMPLISHING A JOINT OF POLYMER LINED ALUMINIUM
Technical Field
The present invention relates to a method and a device for accomplishing a joint of polymer lined aluminium with induction heat.
Background of the Invention
Due to the low resistance of the material, special problems are encountered at joining polymer lined alumi¬ nium, especially thick aluminium, for example with a thick- ness of 85 μm, with induction heat. The efficiency is unacceptably low with the inductors having only one turn and being normally used, which alternatively can be expres¬ sed as that the current in the inductor and the accompany¬ ing matching transformer becomes unacceptably high. The Invention
The problem can according to the invention be solved in the way defined in the appended claims.
A method and a device according to the invention can especially be utilized at longitudinal joint sealing of a packaging blank for the formation of a cylindrical or frusto-conical barrel part for a packaging, but other uti¬ lizations are also possible.
Brief Description of the Drawings
The invention shall be further described below under reference to the accompanying drawings, in which
Fig 1 in perspective illustrates the cooperation bet¬ ween a packaging blank with frusto-conical shape and an in¬ ductor beam for accomplishing a longitudinal joint in the packaging blank, Fig 2 is a side view, namely from the right, of the arrangement shown in Fig 1 with an inductor according to the invention,
Fig 3 is a plan view of the device according to Fig 2,
Fig 4 is an end view from the left of the device according to Fig 3,
Fig 5 is a simplified section along the line V-V in Fig 3 , and Fig 6 is a plan view to a reduced scale of a mandrel for use together with the inductor beam shown in Figs 1 - 5.
Detailed Description of Preferred Embodiments
A frusto-conical packaging blank 1 shall - starting from a planar sheet - be given the conical shape shown in the drawings and be provided with a longitudinal joint in the way defined by the invention, whereupon it can be equipped with a bottom and a cover in a way not further shown or described here. The packaging blank 1 is preferably made of aluminium with a thickness of 50 - 300 μ , for example 85 μm. The aluminium surface is at least on one side lined with a sealable polymer, for example a polyester, but often on both sides. For accomplishing a longitudinal joint in the packa¬ ging blank 1 the technique with induction heat is utilized. For this purpose an inductor beam 2 is used and as dolly a mandrel 3 indicated in Fig 6 and for example made of fabric reinforced bakelite. Special problems are encountered at sealing compara¬ tively thick polymer lined aluminium with induction heat, above all due to the low resistance and high heat conduc¬ ting ability of the material. The current in the inductor and accompanying matching transformer becomes unacceptably high with normal inductors having only one turn. The problem is further complicated at longitudinal joints, where the induced current shall follow the edge of the material as far as possible and then promptly turn. At the method according to the invention use is instead made of an inductor having several windings, prefe¬ rably an inductor with five turns. In the shown case one turn at the place where the longitudinal joint shall be accomplished is formed as an I-beam 4, whereas the other turns are constituted of litz wire 5. A litz wire contains a large number of conductors isolated from each other, in the present case about 400 conductors within a total diame¬ ter of 2 mm, and thus accomplishes an even distribution of the current in the wire.
The I-beam shape is chosen for enabling the applica- tion of the pressure on the joint necessary for the sealing, and the litz wires 5 are laid in the web of the I- beam for concentrating the current and accomplishing the heat necessary for rapid melting and sealing. The I-beam 4 with its litz wires 5 is laid into a ferritic mass for con- centrating the current. At a sealing of 85 μm aluminium sealing times of 30 - 300 ms can be accomplished.
All the return conductors of litz wire 5 (to the left in Figs 4 and 5) are laid next to each other under a copper plate 6 in the inner surface of the inductor beam for the purpose of distributing the current.
The inductor beam 2 can be provided with screw holes 2' for its mounting at the machine (not shown) for the sealing.
At overlapping joints, with which the present inven- tion is concerned, the heat is normally developped in the metal layer closest to the inductor. This means that a for example about 5 mm wide burnt zone can be formed on the surface of the packaging material. This zone must then be free from decoration in the same way as at steel cans and the like with welded longitudinal joint. If the members of the longitudinal joint however are laid m the way which appears from Figs 4 and 5, i e if the member on which the return litz wires 5 and the copper plate 6 are applied is laid lowest in the joint, both the sealing current and the return current will pass through the lower member, which means that the heat will be con¬ centrated to the lower plate layer. The heating of the upper plate layer will hereby occur from below, and the upper printed decorated layer is not damaged. Where the current turns at the outer ends of the longitudinal joint, the current density becomes so great that the material in the packaging blank is damaged. This problem can be obviated in that a copper strip 7 (Fig 6) is arranged on the mandrel or dolly 3 at the back side of the packaging blank 1 in the vicinity of the place where the current turns. Such a strip 7 is m its longitudinal direc¬ tion displaced a few mm mside the end of the longitudinal joint. It will take care of the turning current and will relieve the joint. Such a strip 7 is normally arranged at each end of the longitudinal joint. It can however also occur that the packaging is provided with a cover before the longitudinal joint, and in such case it suffices with one strip 7 at the free end of the joint.
As a modification to the embodiment described above and shown m the drawings with an I-beam, it is also possible to make use of other profiles, such as a U- or T- beam, and the number of litz wires can for example be in the area 3 - 7.
Another way of accomplishing the desired effect with current concentration and pressure application ability s to use an inductor in the form of a number, for example five, next to each other standing but from each other iso¬ lated copper rods, each with a height of 4 - 5 mm and a thickness of 0.8 mm. In the return conducting phase these copper rods can be turned 90° and be placed at a certain distance from each other.

Claims

1. A method for accomplishing a joint of polymer lined aluminium with induction heat, c h a r a c t e r¬ i z e d in that the current in an inductor (2) at the joint is concentrated in that several parallel current con¬ ducting conductors (4, 5) are laid next to each other.
2. A method according to claim 1, c h a r a c t e r¬ i z e d in that four litz wires (5) are laid in the web of an I-beam (4) , which constitutes a fifth conductor and a pressure applicating means.
3. A method according to claim 1, c h a r a c t e r¬ i z e d in that a copper strip (7) or the like is arranged on a mandrel or a dolly (3) for the inductor (2) in the vicinity of the place where the current turns from the in- ductor winding (4, 5) to the return conductors.
4. A device for accomplishing a joint of polymer lined aluminium with induction heat, c h a r a c t e r¬ i z e d in that an inductor (2) for application at the joint is provided with several current conducting conduc- tors (4, 5) arranged next to each other for forming an inductor winding.
5. A device according to claim 4, c h a r a c t e r¬ i z e d in that four litz wires (5) are arranged in the web of an I-beam (4) , which constitutes a fifth conductor and a pressure applicating means.
6. A device according to claim 5, c h a r a c t e r¬ i z e d in that return conductors of litz wire (5) are laid in the inductor (2) next to each other at a distance from the inductor winding.
7. A device according to claim 6, c h a r a c t e r¬ i z e d in that the return conductors (5) are covered by a copper plate (6) for distribution of the current.
8. A device according to claim 4, c h a r a c t e r¬ i z e d in that the inductor winding (4, 5) iε laid into a ferritic mass for concentration of the current.
9. A device according to claim 4, c h a r a c t e r¬ i z e d in that a copper strip (7) or the like is arranged on a mandrel or a dolly (3) for the inductor (2) in the vicinity of the place where the current turns from the inductor winding (4, 5) to the return conductors.
PCT/SE1996/001703 1995-12-20 1996-12-19 A method and device for accomplishing a joint of polymer lined aluminium WO1997022523A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12186/97A AU1218697A (en) 1995-12-20 1996-12-19 A method and device for accomplishing a joint of polymer lined aluminium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504565-4 1995-12-20
SE9504565A SE507308C2 (en) 1995-12-20 1995-12-20 Method and apparatus for providing a joint seal of polymer-coated aluminum

Publications (1)

Publication Number Publication Date
WO1997022523A1 true WO1997022523A1 (en) 1997-06-26

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Application Number Title Priority Date Filing Date
PCT/SE1996/001703 WO1997022523A1 (en) 1995-12-20 1996-12-19 A method and device for accomplishing a joint of polymer lined aluminium

Country Status (3)

Country Link
AU (1) AU1218697A (en)
SE (1) SE507308C2 (en)
WO (1) WO1997022523A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0842854A3 (en) * 1996-11-15 1998-05-27 Auto-Mate Technologies, LLC Induction sealing apparatus for sealing a foil cap to a container opening
US6092643A (en) * 1997-11-07 2000-07-25 Herzog; Kenneth Method and apparatus for determining stalling of a procession of moving articles
US6412252B1 (en) 1996-11-15 2002-07-02 Kaps-All Packaging Systems, Inc. Slotted induction heater
US6633480B1 (en) 1997-11-07 2003-10-14 Kenneth J. Herzog Air-cooled induction foil cap sealer
US6747252B2 (en) 1996-11-15 2004-06-08 Kenneth J. Herzog Multiple head induction sealer apparatus and method

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US2785263A (en) * 1952-03-28 1957-03-12 Philips Corp Method for the local heating of metallic work-pieces by inductive hf-heating and hf-inductor
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US4230923A (en) * 1977-06-20 1980-10-28 Ab Akerlund & Rausing Device for induction welding
US4237360A (en) * 1978-11-06 1980-12-02 Aluminum Company Of America Induction heat sealing
US5260535A (en) * 1990-10-11 1993-11-09 Tetra Alfa Holdings S.A. Apparatus for induction welding

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US2785263A (en) * 1952-03-28 1957-03-12 Philips Corp Method for the local heating of metallic work-pieces by inductive hf-heating and hf-inductor
SE338424B (en) * 1969-06-23 1971-09-06 Spiess C F & Sohn
US3684619A (en) * 1969-10-03 1972-08-15 Karlsruhe Augsburg Iweka Apparatus for making seals on containers
DE2653753A1 (en) * 1976-11-26 1978-06-01 Bosch Gmbh Robert DEVICE FOR MANUFACTURING A PACKAGING TUBE FROM A PACKAGING STRIP BY WELDING THE EDGE AREAS
US4230923A (en) * 1977-06-20 1980-10-28 Ab Akerlund & Rausing Device for induction welding
US4237360A (en) * 1978-11-06 1980-12-02 Aluminum Company Of America Induction heat sealing
US5260535A (en) * 1990-10-11 1993-11-09 Tetra Alfa Holdings S.A. Apparatus for induction welding

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0842854A3 (en) * 1996-11-15 1998-05-27 Auto-Mate Technologies, LLC Induction sealing apparatus for sealing a foil cap to a container opening
US6412252B1 (en) 1996-11-15 2002-07-02 Kaps-All Packaging Systems, Inc. Slotted induction heater
US6629399B2 (en) 1996-11-15 2003-10-07 Kaps-All Packaging Systems Inc. Induction foil cap sealer employing litz wire coil
US6732495B2 (en) 1996-11-15 2004-05-11 Kaps-All Packaging Systems Inc. Induction foil cap sealer
US6747252B2 (en) 1996-11-15 2004-06-08 Kenneth J. Herzog Multiple head induction sealer apparatus and method
US7065941B2 (en) 1996-11-15 2006-06-27 Kaps-All Packaging Systems Inc. Induction foil cap sealer
US6092643A (en) * 1997-11-07 2000-07-25 Herzog; Kenneth Method and apparatus for determining stalling of a procession of moving articles
US6633480B1 (en) 1997-11-07 2003-10-14 Kenneth J. Herzog Air-cooled induction foil cap sealer
US6875965B2 (en) 2000-08-31 2005-04-05 Kenneth J. Herzog Multiple head induction sealer apparatus and method

Also Published As

Publication number Publication date
SE9504565L (en) 1997-06-21
AU1218697A (en) 1997-07-14
SE507308C2 (en) 1998-05-11
SE9504565D0 (en) 1995-12-20

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