WO2013093505A2 - Appareil et procédé - Google Patents

Appareil et procédé Download PDF

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Publication number
WO2013093505A2
WO2013093505A2 PCT/GB2012/053242 GB2012053242W WO2013093505A2 WO 2013093505 A2 WO2013093505 A2 WO 2013093505A2 GB 2012053242 W GB2012053242 W GB 2012053242W WO 2013093505 A2 WO2013093505 A2 WO 2013093505A2
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
face
inductor device
fin
magnetic field
Prior art date
Application number
PCT/GB2012/053242
Other languages
English (en)
Other versions
WO2013093505A3 (fr
Inventor
Martin Mach
Original Assignee
Elopak Systems Ag
ORHAGEN, Christine
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 Elopak Systems Ag, ORHAGEN, Christine filed Critical Elopak Systems Ag
Publication of WO2013093505A2 publication Critical patent/WO2013093505A2/fr
Publication of WO2013093505A3 publication Critical patent/WO2013093505A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/144—Closing paperboard containers
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B29C66/43122—Closing the top of gable top containers
    • 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
    • B29C66/723—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
    • B29C66/72327—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 natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • 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
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/227—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by induction welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—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
    • B29C66/8122—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 composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges

Definitions

  • the present invention relates to the inductive sealing of containers.
  • this invention relates to induction sealing of a top of a gable-top container made from a thermoplastics-coated paperboard material.
  • containers such as gable-top containers can be produced on so-called blank-fed packaging machines.
  • container blanks made from a laminate material comprised of a paperboard substrate and having one or both of its surfaces of thermoplastics laminate, in the form of tubular sleeves, are formed into packages, sealed at one end, sterilized, filled with the product and finally sealed at the other end by means of a jaw-type sealing device.
  • a jaw-type sealing device By providing heat up to a specific temperature melting of the thermoplastics layers occurs and the top fin of the gable-top carton is gripped between two pressure-applying members of the jaw-type sealing device.
  • the laminate packaging material comprises a layer of an electrically conductive material, typically aluminium, and involves the induction of electric currents in the aluminium layer. In this way heat is produced which melts and seals together thermoplastics layers in a face-to-face relationship at a sealing zone.
  • a container such as a gable-top container, includes a multiplicity of layers of material face-to-face in a sealing fin region, then the final seal made across all of those layers is often non-optimal owing to the thickness of the material at that region.
  • apparatus comprising a first sealing member and a second sealing member movable relative to said first member, the sealing members serving to seal a container sealing fin therebetween, the first sealing member including a loop-form inductor device, said loop-form inductor device being embedded in a magnetic field concentrator.
  • a seal of a multi-layered packaging material is obtainable by one heating and pressing cycle.
  • the inductor device is of a loop-form.
  • the first and second sealing members are preferably a pair of sealing jaws. Specifically, one of the pair is a fixed sealing jaw and the other is a movable sealing jaw movable relative to the fixed one.
  • both sealing members include an inductor device.
  • the or each sealing member further comprises a cover member serving to cover the inductor.
  • the cover member is, advantageously, made from a nonmagnetic, electrically non-conductive material and provides a required press pattern for sealing of the fin.
  • the required press pattern is necessary where there are different multiples of layers in different regions of the container fin. For example, it is common for there to be, owing to the construction of a thermoplastics coated laminate paperboard container blank from which the container is made, more layers of the laminate paperboard material when the blank is folded, in the lower region of the sealing fin compared to the upper region.
  • the cover member may comprise a socket for connecting the loop-form inductor with a power supply by way of, for example, one or more flexible coaxial cables. In this way, the movable sealing jaw is thereby free to move during the press operation.
  • the loop-form inductor is supported by a support member in the form of a press beam member.
  • a method comprising providing a laminate comprised of a paperboard layer, an electrically conductive layer and a thermoplastics layer, shaping said laminate into a partially formed gable-top container having a top sealing fin region so as to bring a multiplicity of layers of said thermoplastics layer into a face-to-face relationship with each other in said region, and sealing said multiplicity of layers face-to-face with each other using first and second sealing members, wherein the sealing of the multiplicity of layers is performed in a single induction sealing operation.
  • a sufficient seal of a multi-layered packaging material is obtainable by one heating and pressing cycle.
  • the multiplicity of layers of material to be sealed together is at least three.
  • the induction sealing operation is by way of an inductor located in at least one of the sealing members and embedded in a magnetic field concentrator.
  • the sealing operation comprises a heating phase and a cooling phase.
  • Figure 1 is a schematic perspective view of a sealing jaw
  • Figure 2 is an exploded view of the components of the sealing jaw of Figure 1
  • Figures 3A to 3C show the configuration of a pair of sealing jaws during a sealing operation.
  • a sealing jaw 2 comprises a press beam member 4, a loop- form inductor device or member 6 and a cover member 10.
  • the inductor 6, which is preferably of a hollow tube-like form and constructed from an electrically conductive material, sits in a recess 8 of the press beam 4 and the cover 10 also fits into the recess over the inductor 6 with its external surfaces substantially flush with the immediately surrounding external surfaces of the press beam 4.
  • the inductor 6 is also capable of being cooled by a cooling fluid, such as a cooling liquid, introduced into the sealing jaw 2.
  • the cover 10 comprises holes 12 which allow a passage to corresponding sockets 14 in the inductor 6.
  • Coaxial cables pass through the holes 12 and plug elements on the end of the cables connect with the sockets 14 to deliver electrical power to the inductor.
  • the inductor member 6 also includes a magnetic field concentrator.
  • the magnetic concentrator may preferably be made of soft magnetic composites.
  • the sealing devices of Figures 1 to 3 is suitable for use on aseptic-type packaging machines where the laminate material used comprises at least one layer of an electrically conductive material, typically aluminium.
  • the top sealing operation of gable-top cartons 16 is performed after a product filling stage, and is provided by the induction of electrical currents in the aluminium layer.
  • Induction heating is the non-contact electromagnetic process where a conductive material, such as an aluminium layer in the thermoplastics coated paperboard laminate, passes through a magnetic field that emanates from the inductor member 6.
  • An electrical current is fed through the inductor member 6 supplied through the coaxial cables at a specific frequency and power level to bring about the heating of the fin of the container.
  • the magnetic field is applied for a relatively short time whilst the container has stopped at the sealing station of the packaging machine. Since only the magnetic field that intersects the fin actually does any useful work, the magnetic field concentrator is used to conduct the magnetic field asymmetrically so that the energy generated by the magnetic field is concentrated towards the area where the magnetic field intersects the fin. Thus, the concentrator conducts the magnetic field more efficiently than air thereby effectively aiming and intensifying the asymmetric magnetic field at the area of the fin to be heated.
  • FIG 3A a pair of sealer jaws 2 are shown in a sealing position, sealing the top fins of two gable top cartons 16.
  • the sealer jaw 2 on the right-hand side of the top fins is a fixed jaw whilst that jaw 2 on the left-hand side of the fins is movable relative to the fixed jaw 2.
  • Figure 3B shows the position of the two cartons 16 with the movable jaw 2 removed.
  • the cover member 10, on its face 18 which contacts the top fin 20 of each of the cartons 16 has a first thickness in an upper section 18' and a second thickness 18" in a lower section. The first thickness is different from the second thickness in order to accommodate the amount of different layers of laminate material in the fins 20 of the cartons 16.
  • FIG. 3C shows, schematically the position of the inductor member 6 in the fixed jaw 2.
  • the inductor member 6 is advantageously of a loop-form and, for sealing, arranged so that the loop is substantially vertical to be in close proximity and substantially parallel to the substantially vertical top fins 20 of the cartons 16.
  • the press beam member 4 comprises a recess 22 at the rear underside in order to accommodate a pour spout fitment 24 attached to a top roof sub-panel 26 of the cartons 16.
  • Such an arrangement allows a sealing configuration with up to five layers of the laminate packaging material arranged face-to-face in the lower gable seal region 20' and up to three layers in the upper gable seal region 20".
  • the inducing of the asymmetric electromagnetic field simultaneously produces a flow of heat-producing eddy currents within all electrically conductive aluminium layers of the cartons 16.
  • the pair of jaws 2 are able to perform a top sealing operation within a single heating and pressing cycle, perform the sealing operation with one or, if using a double-indexing packaging form-fill-seal machine, two cartons 16 in parallel (as shown in Figures 3A to 3C), apply sealing energy symmetrically from two electrically active sealing jaws 2, apply the asymmetric electromagnetic field at relatively lower frequencies up to 200 kHz, and apply an electrical current in the inductor members 6 flowing in an opposite direction.
  • the fluid cooled inductor member 6 present in each of the pair of jaws 2 may have a variable cross-section in the top and bottom gable seal areas. Since the degree of heating energy generated by the magnetic field is proportional to the cross-sectional area of the inductor member 6, this variable cross-section allows the ability to adjust the energy output according to the number of layers of material in the lower and upper gable seal regions 20' and 20" respectively.
  • the whole sealing cycle is approximately 1800 milliseconds in length of time and comprises a relatively short heating phase when the asymmetric magnetic field is generated of around 400 to 500 milliseconds.
  • This heating phase is then followed by a cooling phase when a cooling fluid is introduced into the sealing jaws.
  • the cooling phase is not only important for cooling the inductor member but also provided a useful cooling effect on the sealing fin of the container in order to achieve a sufficient seal over substantially the whole region of the fin 20.
  • This cooling phase of the sealing cycle is preferably carried out at the same location as the heating phase, but could alternatively be carried out at a separate cooling station located at a subsequent indexing position of the containers in the packaging machine.
  • the cover member 10 is preferably non-magnetic, electrically non-conductive and advantageously made of thermoplastics or ceramic material providing the required press pattern, as discussed above.
  • the holes 12 for connecting the inductor 6 with a power supply through the flexible coaxial cables (not shown), enable the movable jaw 2 to move relatively freely during the sealing operation.
  • the present invention thus enables the reduction in the time needed for performing the sealing operation of a top sealing fin of gable-to containers, the minimizing of space requirements as well as providing the efficient heating of the multi-layered packaging material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Making Paper Articles (AREA)
  • Closing Of Containers (AREA)

Abstract

L'invention porte sur un appareil, qui comprend un premier élément d'étanchéité et un second élément d'étanchéité mobile par rapport audit premier élément, les éléments d'étanchéité (2) servant à sceller hermétiquement une ailette d'étanchéité de récipient (20) entre ceux-ci, le premier élément d'étanchéité (2) comprenant un dispositif d'inducteur (6), le dispositif d'inducteur étant incorporé dans un concentrateur de champ magnétique. L'invention porte également sur un procédé, qui met en œuvre la disposition d'un stratifié constitué par une couche de carton, une couche électroconductrice et une couche thermoplastique, la mise en forme du stratifié sous la forme d'un carton à pignon partiellement formé ayant une région d'ailette d'étanchéité supérieure de façon à amener une multiplicité de couches de la couche thermoplastique en relation de vis-à-vis entre elles dans ladite région, et le scellement hermétique de la multiplicité de couches en vis-à-vis entre elles à l'aide des premier et second éléments d'étanchéité, le scellement hermétique de la multiplicité de couches étant effectué en une opération de scellement par induction unique.
PCT/GB2012/053242 2011-12-23 2012-12-21 Appareil et procédé WO2013093505A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1122293.2 2011-12-23
GBGB1122293.2A GB201122293D0 (en) 2011-12-23 2011-12-23 Apparatus and method

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WO2013093505A2 true WO2013093505A2 (fr) 2013-06-27
WO2013093505A3 WO2013093505A3 (fr) 2013-10-03

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WO (1) WO2013093505A2 (fr)

Cited By (2)

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WO2015177036A1 (fr) * 2014-05-21 2015-11-26 Elopak As Procédé et dispositif de thermoscellage de plusieurs couches d'un stratifié
WO2016107691A1 (fr) * 2014-12-30 2016-07-07 Sig Technology Ag Dispositif et procédé de chauffage par induction d'enveloppes d'emballage

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SE515152C2 (sv) * 1999-02-01 2001-06-18 Tetra Laval Holdings & Finance Sätt och anordning för att forma och värmeförsegla förpackningsbehållare
US6848235B2 (en) * 2002-02-08 2005-02-01 Scholle Corporation Adverse environment foil cap seal system
ATE522343T1 (de) * 2007-06-28 2011-09-15 Tetra Laval Holdings & Finance INDUKTIONSVERSIEGELUNGSVORRICHTUNG ZUR WÄRMEVERSIEGELUNG VON VERPACKUNGSMATERIAL ZUR HERSTELLUNG VERSIEGELTER VERPACKUNGEN FÜR AUSGIEßBARE LEBENSMITTELPRODUKTE

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015177036A1 (fr) * 2014-05-21 2015-11-26 Elopak As Procédé et dispositif de thermoscellage de plusieurs couches d'un stratifié
RU2662001C2 (ru) * 2014-05-21 2018-07-23 Элопак Ас Способ и устройство для горячего запечатывания нескольких слоев слоистого материала
US10647062B2 (en) 2014-05-21 2020-05-12 Elopak As Method for heating multiple piles of a laminate
WO2016107691A1 (fr) * 2014-12-30 2016-07-07 Sig Technology Ag Dispositif et procédé de chauffage par induction d'enveloppes d'emballage
CN106232328A (zh) * 2014-12-30 2016-12-14 Sig技术股份公司 用于对包装套筒感应加热的装置和方法
JP2017526550A (ja) * 2014-12-30 2017-09-14 エスアイジー テクノロジー アーゲー 包装スリーブを誘導加熱するための装置および方法
CN106232328B (zh) * 2014-12-30 2019-01-22 Sig技术股份公司 用于对包装套筒感应加热的装置和方法
RU2702839C2 (ru) * 2014-12-30 2019-10-11 Сиг Текнолоджи Аг Устройство и способ индукционного нагрева корпусов упаковок
US10562236B2 (en) 2014-12-30 2020-02-18 Sig Technology Ag Device and method for inductively heating package sleeves

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WO2013093505A3 (fr) 2013-10-03

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