WO2012019925A1 - An inductor for sealing packages - Google Patents

An inductor for sealing packages Download PDF

Info

Publication number
WO2012019925A1
WO2012019925A1 PCT/EP2011/063030 EP2011063030W WO2012019925A1 WO 2012019925 A1 WO2012019925 A1 WO 2012019925A1 EP 2011063030 W EP2011063030 W EP 2011063030W WO 2012019925 A1 WO2012019925 A1 WO 2012019925A1
Authority
WO
WIPO (PCT)
Prior art keywords
inductor
magnetic
inductor body
lid
sealing
Prior art date
Application number
PCT/EP2011/063030
Other languages
French (fr)
Inventor
Andrea Babini
Tomas NILÉN
Pietro Monari
Marko Stajkovic
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.
Publication of WO2012019925A1 publication Critical patent/WO2012019925A1/en

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
    • B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary members
    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81465—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • 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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/107—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for continuous movement of material
    • 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
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and 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
    • B29C66/81—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
    • B29C66/818—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
    • B29C66/81—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
    • B29C66/8187—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 electrical insulating constructional aspects
    • B29C66/81871—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 electrical insulating constructional aspects of the welding jaws

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Package Closures (AREA)
  • Laminated Bodies (AREA)

Abstract

An inductor, for inducing a current in a layer of a carton-based laminate, comprising an inductor body, a magnetic insert held by said inductor body, and a conductive element held by said magnetic insert. The inductor further comprises a non-magnetic lid covering said conductive element and releasably attached to said inductor body.

Description

An inductor for sealing packages
Technical Field
The invention generally relates to the field of packaging sealing technology. More particularly, it relates to continuous sealing of two packaging laminates comprising a conductive layer, such as an Aluminum foil, at least one plastic layer and a carton layer.
Background of the invention
Carton-based packages, e.g. Tetra Brik™ packages, are well known in most parts of the world as packages for liquid food, such as milk. During the last decades carton-based packages for prepared food, such as peas and tomatoes, have been developed and today, as an alternative to metal cans, prepared food can be bought in carton-based packages, e.g. Tetra Recart™ packages. Due to the improved logistics and the environmental profile of carton-based packages the demand for such packages are increasing among consumers and retailers worldwide.
In order to produce a package out of a carton-based laminate two general approaches exist, the roll fed approach and the blanks fed approach. In the roll fed approach a tube is made from a web of packaging material by continuously directing the web and making a longitudinal sealing. The tube is filled with product and then by making successive transversal sealings and cuttings in the lower end of the tube, packages are formed from the tube. By providing means for holding the tube in position during transversal sealing and cutting, and by providing subsequent folding means different forms may be obtained.
When using the blanks fed approach, blanks are fed into a packaging machine. The blanks are often provided with a pre-made longitudinal sealing, therefore the first step in such a packaging machine is often to erect the blanks such that sleeves are formed. Secondly, the sleeves are formed into packages with open top ends by sealing the bottom ends of the sleeves. Thirdly, the product is filled via the open top ends. Finally, the top ends are sealed and closed packages are formed.
The sealing technologies used in the above described approaches may be divided into non-continuous sealing and continuous sealing. For instance, non-continuous sealing may be used in the tube fed approach in the step of transversal sealing and cutting the tube and continuous sealing may be used when making the top end sealings in the blanks fed approach. More particularly, the continuous sealing may be described as a two step process. In the first step the carton-based laminates are prepared for sealing and in the second step the carton-based laminates are pressed together thereby achieveing a sealing.
Different technologies for sealing carton-based laminates exist, such as induction heat sealing and ultrasonic sealing. Induction heat sealing, which is a common sealing technology used for sealing carton-based laminates, is based on that an inductor comprising a conductive element induces eddy currents in a conductive layer of the packaging laminate, which in turn melts an inner plastic layer of the packaging laminate. Then by pressing the two inner plastic layers together a sealing can be achieved.
An inductor of today used for continuous sealing in blanks fed systems using induction heat sealing can comprise an inductor body, a magnetic insert and a conductive element, such as a copper coil. Short circuits in such inductors may arise in two variants, external short circuits and internal short circuits. External short circuits often arise when parts of the product or other materia are stucked on the conductive element of the inductor. Internal short circuits can be caused by internal corrosion in the magnetic insert. When a short circuit arises the sealing process is interrupted and the machine has to be stopped.
Summary
Accordingly, the present invention preferably seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems e.g. by providing an inductor for inducing a current in a layer of a carton-based laminate, said inductor comprising an inductor body, a magnetic insert held by said inductor body, and a conductive element held by said magnetic insert, wherein said inductor further comprises a non-magnetic lid covering said conductive element and releasably attached to said inductor body.
The inductor body may be made of Aluminum.
Further, the inductor body may anodized.
The inductor body may be divided in a first inductor body part and a second inductor body part, said second inductor body part being realeasably attached to said first inductor body part.
The first inductor body part may be provided with a first groove and said second inductor body part may be provided with a second groove, said first groove and said second groove being adapted to hold said non-magnetic lid.
The inductor body may be water cooled. In combination or
alternatively, the conducitve element may be water cooled.
The magnetic insert may comprise Zink and/or Nickel. More
particularly, the magnetic insert may comprise Ni-Zn ferrite.
The non-magnetic lid may be a ceramic lid. Further, the ceramic lid may have a thickness of 0, 10 - 0,25 mm.
Further, it is provided an apparatus for sealing carton-based laminates together, said apparatus comprising the inductor mentioned above.
Brief description of the drawings
The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, wherein:
Fig 1 generally illustrates one example of a set up for continuous sealing.
Fig 2 illustrates an inductor in further detail. Fig 3 illustrates the inductor in further detail with the non-magnetic lid removed.
Fig 4 illustrates a magnetic insert in further detail.
Fig 5 illustrates a conductive element in further detail.
Fig 6 illustrates a non-magnetic lid in further detail.
Fig 7 illustrates a first inductor body part in further detail.
Detailed description of preferred embodiments
Since sealing packages may be made by using different technologies, a number of different set-ups may be used. Fig 1 generally illustrates one example of a set up 100 for continuouos sealing. For illustrative purposes only cross-sections of lower ends of packages are illustrated.
The continuous sealing process illustrated herein comprises three main steps - folding a package, preparing the package for sealing and sealing the package by applying a pressure.
The step of folding may be achieved by transporting a first package 102a, being erected and thereby having a rectangular cross-section, in a direction of transportation A and having guiding bars 104 placed such that two sides of the first package 102a, parallel to the direction of transportation A, are brought towards each other.
Next, the step of preparing the package for sealing may be achieved by providing an inductor 106 comprising a conductive element through which a current flows. This current in turn induces eddy currents in a conductive layer of a second package 102b passing close to the inductor 106. The heat generated from these eddy currents melts an inner plastic layer of the second package 102b. In order to make sure that the package 102b is held in correct position with respect to the inductor 106 a supporting member 107 may be used.
Finally, in order to make a sealing, a number of rollers 108 are provided for pressing the two sides of the package together. A third package 102c placed between the number of rollers 108 obtains in this way a closed end that can hold liquid food. In order to prevent the main portions of the packages from being deformed carriers may be used for holding the packages during the sealing process. Further, in order to facilitate the folding process creasing lines may be provided in the packages.
Fig 2 illustrates the inductor 106 in further detail. The inductor 106 comprises a first inductor body part 200 and a second inductor body part 202 attached to each other by a number of attaching means 204a, 204b, 204c, such as screws. A conductive element 206 can have an L-shaped form having one leg held between the first and second inductor body parts 200, 202 and another leg placed outside and arranged for being connected to a generator.
In order to prevent that food product packed in the packages or other materia get stucked on the condutive element 206 held between the first and second inductor body parts 200, 202 and hence cause a short circuit, a non- magnetic lid 208 may be used to cover the conductive element 206. The nonmagnetic lid 208 may be a ceramic lid.
An advantage of using a ceramic lid is that less friction is caused between the passing packages and the inductor 106, which reduces the wearing of the inductor. Further, the low friction reduces the amount of plastic residues and product stucked on the inductor 106. Moreover, the ceramic lid does not interfere with the electromagnetic field, which provides for that the efficiency of the inductor 106 remains at a high level although it is shielded. Further, the ceramic lid 106 can be made thin, prefererably 0, 15 - 0,20 mm.
The ends of the inductors may be protected by a first and a second end piece 210, 212 which can be made of plastic and attached to the first inductor body part 200.
By having the non-magnetic lid 208 held as described above and by having the attaching means attaching the second inductor body part 202 to the first inductor body part 200 placed such that they may be detached while the first inductor body part 200 is attached to a packaging machine, it is possible to easily replace the non-magnetic lid 208, the conducitve element 206 or the magnetic insert 300 even if the first inductor body part 200 is fixed. Fig 3 illustrates the inductor 106 in further detail with the non-magnetic lid 208 removed. With the non-magnetic lid 208 removed a magnetic insert 300 holding the conductive element 206 is revealed. By having the magnetic insert 300 the electromagnetic field generated by the conductive element 206 can be directed towards the passing packages, which provides for that a higher efficiency may be achieved. In order to prevent corrosion within the magnetic insert 300 it may be made of a ferrite comprising Nickel and/or Zink, such as Ni-Zn ferrite. Alternatively, the magnetic insert may comprise Mangan and Zink, such as Mn-Zn ferrite.
An advantage of using Ni-Zn ferrite compared to Mn-Zn is that the resistivity for Ni-Zn ferrite is about 10Λ5 times higher than the resistivity for Mn-Zn ferrite. An implication of a high resistivity is that no painting or insulating layer is needed in order to prevent internal short circuits, which is an advantage since applying an insulating layer onto a magnetic insert in a reliable manner can be problematic and expensive.
As illustrated in fig 3, the first induction body part 200 may be provided with a groove 302 for holding the non-magnetic lid 208 and the second inductor body part 202 may be provided with a corresponding groove 304 for holding the non-magnetic lid 208. The grooves 302, 304, the end pieces 210, 212 and the non-magnetic lid 208 can be arranged such that the nonmagnetic lid 208 can be held in place by the grooves 302, 304 and the end pieces 210, 212, which is advantageous since this reduces the risk that the non-magnetic lid breaks. Further, since the end pieces 210, 212 and the first and second inductor body parts 200, 202 may be dismantled from each other, the non-magnetic lid may be replaced easily with a low risk that the lid to be replaced breaks or that a new lid breaks during installation.
An advantage of having the non-magnetic lid 208 is that it prevents plastic residues and other unwanted objects from coming into contact with the magnetic insert 300 and thereby reducing the risk of corrosion which, as described, can result in short circuits and failure of the inductor 106.
Fig 4 illustrates the magnetic insert 300 in further detail. As illustrated, it may be adapted to the conductive element 206 to be placed in the magnetic insert 300. Fig 5 illustrates the condutive element 206 in further detail. As illustrated, one leg of the L-shaped inductive element 206 may be adapted to be connected to a generator or other similar means and the other leg may be adapted to be placed in the magnetic insert 300. In order to avoid short circuits an insulating layer may be used.
Fig 6 illustrates a non-magnetic lid 208 in further detail. The
longitudinal ends to be placed in the grooves 302, 304 may be slanted, thereby making it possible to hold the non-magnetic lid 208 between the first and second inductor body part 200, 202 in a way that reduces the risk that the non-magnetic lid 208 breaks.
Fig 7 illustrates the first inductor body part 200. As illustrated, it may be arranged to be attached to the second inductor body part 202 by having screw holes made. Similarly, screw holes may be made for attaching the end pieces 210, 212.
Further, in order to prevent the first inductor body 200 from expanding during use of the inductor 106, the first inductor body 200 may be water cooled. An implication of keeping the expansion in control is that the risk of breaking the ceramic lid 208 is further reduced.
Another advantage of having inductor body parts 200,202 made of Aluminum is that walls of the inductor body parts 200, 202 may be made thinner which reduces the risk of structural breakages.
The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.

Claims

1 . An inductor for inducing a current in a layer of a carton-based laminate, said inductor comprising
an inductor body,
a magnetic insert held by said inductor body, and
a conductive element held by said magnetic insert,
c h a r a c t e r i s e d i n t h a t
said inductor further comprises
a non-magnetic lid covering said conductive element and releasably attached to said inductor body.
2. The inductor according to claim 1 , wherein said inductor body is made of Aluminum.
3. The inductor according to claim 2, wherein said inductor body is anodized.
4. The inductor according to any one of the preceding claims, wherein said inductor body is divided in a first inductor body part and a second inductor body part, said second inductor body part being realeasably attached to said first inductor body part.
5. The inductor according to claim 4, wherein said first inductor body part is provided with a first groove and said second inductor body part is provided with a second groove, said first groove and said second groove being adapted to hold said non-magnetic lid.
6. The inductor according to any of the preceding claims, wherein said inductor body is water cooled.
7. The inductor according to any of the preceding claims, wherein said conductive element is water cooled.
8. The inductor according to any one of the preceding claims, wherein said magnetic insert comprises Zink.
9. The inductor according to any one of the preceding claims, wherein said magnetic insert comprises Nickel.
10. The inductor according to any one of the preceding claims, wherein said magnetic insert comprises Ni-Zn ferrite.
1 1 . The inductor according to any one of the preceding claims, wherein said non-magnetic lid is a ceramic lid.
12. The inductor according to claim 1 1 , wherein said ceramic lid has a thickness of 0,10 - 0,25 mm.
13. An apparatus for sealing carton-based laminates together, said apparatus comprising the inductor according to any one of the preceding claims.
PCT/EP2011/063030 2010-08-09 2011-07-28 An inductor for sealing packages WO2012019925A1 (en)

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WO2016107691A1 (en) * 2014-12-30 2016-07-07 Sig Technology Ag Device and method for the inductive heating of packaging casings
WO2017215940A1 (en) * 2016-06-14 2017-12-21 Tetra Laval Holdings & Finance S.A. Pressure unit
EP3381815A1 (en) * 2017-03-28 2018-10-03 Tetra Laval Holdings & Finance S.A. A sealing member comprising a package volume controlling section
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US10899082B2 (en) 2017-07-17 2021-01-26 Tetra Laval Holdings & Finance S.A. Inductor coil for induction welding of a packaging material
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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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WO2014166765A1 (en) * 2013-04-10 2014-10-16 Tetra Laval Holdings & Finance S.A. Induction sealing device and method for manufacturing an induction sealing device
CN105191493A (en) * 2013-04-10 2015-12-23 利乐拉瓦尔集团及财务有限公司 Induction sealing device and method for manufacturing an induction sealing device
US10160162B2 (en) 2013-04-10 2018-12-25 Tetra Laval Holdings & Finance S.A. Induction sealing device and method for manufacturing an induction sealing device
CN105191493B (en) * 2013-04-10 2017-05-31 利乐拉瓦尔集团及财务有限公司 The preparation method of induction sealing device and induction sealing device
US10322546B2 (en) 2014-06-12 2019-06-18 Tetra Laval Holdings & Finance S.A. Induction heating device
CN106232328A (en) * 2014-12-30 2016-12-14 Sig技术股份公司 For the apparatus and method to package sleeve sensing heating
JP2017526550A (en) * 2014-12-30 2017-09-14 エスアイジー テクノロジー アーゲー Apparatus and method for induction heating of a packaging sleeve
AU2015373620B2 (en) * 2014-12-30 2018-04-26 Sig Technology Ag Device and method for the inductive heating of packaging casings
US10562236B2 (en) 2014-12-30 2020-02-18 Sig Technology Ag Device and method for inductively heating package sleeves
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CN106232328B (en) * 2014-12-30 2019-01-22 Sig技术股份公司 For the device and method to package sleeve induction heating
WO2016107691A1 (en) * 2014-12-30 2016-07-07 Sig Technology Ag Device and method for the inductive heating of packaging casings
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
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US11021287B2 (en) 2016-06-14 2021-06-01 Tetra Laval Holdings & Finance S.A. Pressure unit
US10640242B2 (en) 2017-03-28 2020-05-05 Tetra Laval Holdings & Finance S.A. Sealing member comprising a package volume controlling section
WO2018178024A1 (en) * 2017-03-28 2018-10-04 Tetra Laval Holdings & Finance S.A. A sealing member comprising a package volume controlling section
EP3381815A1 (en) * 2017-03-28 2018-10-03 Tetra Laval Holdings & Finance S.A. A sealing member comprising a package volume controlling section
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
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