WO2021122244A1 - Procédé et dispositif d'inspection de la résistance du soudage de capuchon de contenant d'emballage - Google Patents

Procédé et dispositif d'inspection de la résistance du soudage de capuchon de contenant d'emballage Download PDF

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Publication number
WO2021122244A1
WO2021122244A1 PCT/EP2020/085373 EP2020085373W WO2021122244A1 WO 2021122244 A1 WO2021122244 A1 WO 2021122244A1 EP 2020085373 W EP2020085373 W EP 2020085373W WO 2021122244 A1 WO2021122244 A1 WO 2021122244A1
Authority
WO
WIPO (PCT)
Prior art keywords
cap
temperature range
inner cover
leg portions
temperatures
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2020/085373
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English (en)
Inventor
Yasuyuki Moriyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Publication of WO2021122244A1 publication Critical patent/WO2021122244A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82—Testing the joint
    • B29C65/8261—Testing the joint by the use of thermal means
    • 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
    • B29C65/3672—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like
    • B29C65/5021—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/561—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using screw-threads being integral at least to one 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • 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
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/002—Investigating fluid-tightness of structures by using thermal means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/38—Investigating fluid-tightness of structures by using light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/002—Thermal testing
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
    • B29C66/53245—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow
    • B29C66/53246—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow said single elements being spouts, e.g. joining spouts to containers
    • B29C66/53247—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow said single elements being spouts, e.g. joining spouts to containers said spouts comprising flanges
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
    • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7166—Cartons of the fruit juice or milk type, i.e. containers of polygonal cross sections formed by folding blanks into a tubular body with end-closing or contents-supporting elements, e.g. gable type containers

Definitions

  • the present invention relates to a method and a device for inspecting the welding strength of a cap in an unsealing device of the type in which an upper surface of a linking portion, which is formed as a single piece with an inner cover formed flush with a packaging container that has been filled with a beverage or liquid food and hermetically sealed, and a cap, which is mated with the outer circumference of a spout protruding from the packaging container, are welded, and when the cap is opened, the inner cover is also opened at the same time in conjunction therewith.
  • a large number of beverages and liquid foods such as tea, fruit and vegetable juices, milk and sauces are made commercially available by enclosing them in packaging containers formed from a sheet-like packaging material made of sterilized paper.
  • Unsealing devices for extracting contents to the outside from the sterilized packaging containers must maintain a sterile interior state until the time of unsealing, and must also be easily unsealable with a small force at the time of unsealing.
  • Unsealing devices with various structures comprising a lid, a spout and a linking portion, etc. have therefore been proposed.
  • a packaging container which has been conventionally used, comprising a pull-ring formed by moulding plastic on the packaging material and a lid which is mated with a spout enclosing the periphery of the pull-ring, has a structure in which, after the lid has been initially taken off, the pull-ring is pulled with a finger to remove an inner cover, thereby forming a hole in the packaging material.
  • this structure however, there are times when the contents are accidentally ejected because of a reaction movement of the packaging container when the pull-ring is removed from the packaging material.
  • an unsealing device of the type in which opening of a cap also opens the inner cover at the same time.
  • Fig. 1 shows a cross section of the above unsealing device 1 in the direction of an axis A.
  • a plastic spout 11 and a plastic linking portion 12 are preformed as a single piece at a forming position of the unsealing device 1 of a sheet-like packaging container 10, in such a way that a bottom portion thereof is flush with the packaging container 10.
  • An annular groove 13 is formed at this bottom portion between an inner wall of the spout 11 and the linking portion 12 and has a smaller thickness than that of the surrounding portion, and a circular region enclosed by the annular groove 13 constitutes an inner cover 14.
  • the linking portion 12 comprises two or more leg portions 15, a lower side of which is formed continuously with the inner cover 14, and an annular portion 16 which is contiguous with an upper end portion of said leg portions 15.
  • a helical groove 22 mating with helical projections 21 provided on the outer circumference of the plastic spout 11 is formed on an inner circumferential surface of a cap 20, and an unsealing indication ring 23 which readily separates from a lid main body as a result of rotation of the cap 20 is formed at a bottommost portion of the cap 20.
  • a laminate 19 comprising, from above, an aluminium foil layer and a layer of plastic such as polyethylene is fixed to a bottom surface of the cap 20.
  • An upper surface of the annular portion 16 abuts the plastic layer of the laminate 19 when the cap 20 is closed.
  • Fig. 2 is an exploded outline diagram to make the configuration of the unsealing device 1 clearer.
  • the cap 20 is rotated fully onto the spout 11 to close same, after which an induction heating device 30 is placed in contact with an upper surface of the cap 20 and an electrical current is applied, at which point the aluminium foil layer of the laminate 19 on the bottom of the cap 20 generates heat as a result of electromagnetic induction, the plastic layer therebelow melts, and the bottom portion of the cap 20 and the annular portion 16 are welded and fixed as a result (fig. 4).
  • the linking portion 12 in which the annular portion 16, leg portions 15 and inner cover 14 are formed as a single piece can be detached from the container together with the cap 20, and the contents can be poured to the outside (fig. 5).
  • Patent Publication 2 describes a method in which a bottom surface of a cap and an upper surface of a spout are welded by means of induction heating using a laminate comprising an aluminium foil layer and a plastic layer, the extent of welding and uniformity of the welded state are acquired as an infrared thermal image by means of an infrared camera, and said thermal image is compared with a thermal image of a favourable bonding state by an image inspection processing device so as to inspect whether the state of sealing of the cap is favourable. It is concluded in that document that if a thermal image of the surface of the cap shows a clean doughnut-shaped pattern at an upper end portion of the spout welded to the cap, then this constitutes a favourable sealing condition.
  • the linking portion is provided between the inner cover and the cap, and the inner cover linked to the cap must also be removed by means of the linking portion at the same time as the cap is opened, so greater welding strength than in the case of Patent Publication 2 is needed between the upper surface of the linking portion and the cap which have been welded, and the cap and the inner cover must be linked with greater precision.
  • the resin bottle cap according to Patent Publication 2 and the unsealing device for a packaging container formed from a sheet-like packaging material made of paper according to Patent Publication 1 belong to completely different technical fields, so the inspection method according to Patent Publication 2 cannot be used unmodified in an unsealing device to which the present invention is applied, as will be described later.
  • the aim of the present invention lies in providing a method for reliably and easily inspecting the welded state of an unsealing device of the type in which an upper surface of a linking portion formed as a single piece with an inner cover and a cap are welded, and when the cap is opened, the inner cover is also opened at the same time in conjunction therewith, and also in providing an inspection device.
  • an aluminium foil/plastic laminate fixed to a bottom surface of a cap is caused to generate heat by electromagnetic induction in the aluminium foil layer by means of an electromagnetic induction heating device arranged on an upper side of the cap, and the plastic underlayer and an annular portion on the very top of a linking portion are welded, after which a temperature distribution on the surface of the cap in the region of the annular portion is acquired as an infrared thermal image using an infrared camera, and this thermal image is displayed in colour as a temperature distribution on the surface of the cap by means of an image processing device.
  • the present inventor found that it is possible to determine the welding strength of the cap by means of a temperature pattern in the region of the annular portion, in particular in the region of leg portions mechanically linking the annular portion and the inner cover.
  • an unsealing device comprising: an inner cover which is formed on a bottom portion of a spout protruding from a packaging container filled with a beverage or a liquid food and hermetically sealed, the inner cover being flush with the packaging container; a cap which is mated with the outer circumference of the spout; a laminate comprising an aluminium foil layer and a plastic layer bonded to a bottom surface of the cap; and a linking portion comprising a plurality of leg portions which are formed as a single piece with the inner cover and extend from the inner cover in the direction of the cap, and an annular portion which is linked to said plurality of leg portions and abuts the laminate, the inner cover being joined to the cap via the linking portion by fusing the plastic layer to the cap by means of induction heating of the aluminium foil layer, and said unsealing device having a function with which, when the cap is opened, the inner cover is also released from the
  • the abovementioned temperature range is determined from pre measured temperature data relating to a plurality of unsealing devices in which the inner cover is also opened at the same time as the cap.
  • a temperature distribution obtained by imaging the whole surface of the cap using an infrared camera is divided into at least three regions, namely the predetermined temperature range, a temperature range higher than the predetermined temperature range, and a temperature range lower than the predetermined temperature range, and it is determined whether all of the temperatures in the respective regions corresponding to the plurality of leg portions are within the predetermined temperature range.
  • the temperatures on the surface of the cap at the positions of the plurality of leg portions are measured by means of an infrared radiation thermometer, and it is determined whether all of the measurement temperatures are within the predetermined temperature range.
  • the present invention also provides an inspection device for determining the welding strength of a cap.
  • the inspection device comprises, as a means for measuring temperature, an infrared camera for imaging the whole surface of the cap, and includes an image processing device which performs imaging by dividing a distribution of the measured temperatures into at least three regions, namely the predetermined temperature range, a temperature range higher than the predetermined temperature range, and a temperature range lower than the predetermined temperature range.
  • an infrared radiation thermometer for measuring the temperatures on the surface of the cap at the positions of the plurality of leg portions is provided as a means for measuring the temperature.
  • the inspection device includes: a memory unit for storing a predetermined temperature range which is defined in advance on the basis of measured temperature data relating to a plurality of unsealing devices in which the inner cover is also opened at the same time as the cap; a comparison unit for comparing whether all of the temperatures in the respective regions corresponding to the plurality of leg portions are within the predetermined temperature range; and a determination unit for determining the welding strength as a result.
  • the inspection method according to the present invention makes it possible to reliably and easily inspect the quality of welding strength between a cap and an inner cover. Additionally, the inspection method according to the present invention makes it possible to omit image processing outside of the leg portion regions because it is sufficient for the temperature in the leg portion regions to be measured, so it is possible to conduct the inspection more rapidly, and to simplify and reduce the size of the inspection device compared with the prior art.
  • FIG. 1 is a view in longitudinal section of an unsealing device of a packaging container to which the present invention is applied.
  • Fig. 2 is an exploded diagram showing the configuration of the unsealing device.
  • Fig. 3 is an outline diagram showing a state before a cap of the unsealing device is closed.
  • Fig. 4 shows a state after the cap of the unsealing device has been closed, where an electromagnetic induction heating device is placed in contact therewith to provide heating. A cross section of only the unsealing device portion is shown.
  • Fig. 5 is an external view showing a state in which the cap has been opened after a linking portion of the unsealing device has been welded.
  • Fig. 6 schematically shows temperature distributions obtained by imaging an upper surface of the cap by means of an infrared camera, after the linking portion of the unsealing device has been welded.
  • an electrical current is made to flow to an internal coil in a state in which an electromagnetic induction heating device 30 is placed in contact from an upper surface of the cap 20 or in a state of non- contact so that heat is generated by an aluminium foil layer by means of electromagnetic induction, and a plastic underlayer and an annular portion 16 on the very top of the linking portion 12 are welded.
  • a temperature distribution on the surface of the cap 20 is acquired as an infrared thermal image using a commercially-available infrared camera, and this thermal image is displayed on a display with the temperature distribution being shown in predetermined colours by means of an image processing device.
  • temperature ranges are divided into at least three stages, namely an optimum temperature range, a temperature range higher than the optimum temperature range, and a temperature range lower than the optimum temperature range.
  • the optimum temperature range is a temperature range in which sufficient welding strength can be achieved, and other ranges are temperature ranges in which only insufficient welding strength can be achieved.
  • Fig. 6 schematically shows patterns of temperature distributions on the surface of the cap 20 imaged in this way. Differences in temperature are not represented by colours in fig. 6, rather by differences in shading of cross-hatching. The dotted lines show the outer circumference of the cap 20 and locations corresponding to leg portions 15. [0022]
  • regions corresponding to the annular portion 16 had a higher temperature than a surrounding region, and a ring-shaped high-temperature region could be seen to reflect this.
  • Non-uniformity was apparent in the temperature of the annular portion when a laminate 19 was cracked, when foreign material was pinched between the laminate 19 and the cap 20, or when the positions of the laminate 19 and the cap 20 were misaligned, etc.
  • the welding strength was insufficient when the temperature in the leg portion regions was not within the abovementioned optimum temperature range, as in fig. 6(D) and fig. 6(E).
  • the temperature of the leg portion regions was within the optimum temperature range, as in fig. 6(A), fig. 6(B) and fig. 6(C)
  • sufficient welding strength was achieved even if the temperature in other regions of the ring portion was outside the optimum temperature range or there was non-uniformity in the temperature. Accordingly, in the inspection method according to the present invention, it is determined whether the temperature in two narrow regions (the regions enclosed by the dotted lines positioned at the top and bottom of the ring portions in fig.
  • the temperature range in which sufficient welding strength is achieved which was obtained on the basis of the abovementioned experiment is the optimum temperature range, and this is pre-stored in a memory unit in the image processing device as a predetermined temperature range, and a determination may be made during the inspection by comparing the temperatures in the leg portion regions with the predetermined temperature range, without the need to make a determination by comparing the temperature distribution pattern of the whole of the ring portion with a pre-stored reference pattern.
  • the optimum temperature range obtained by actual measurement was 55-60 (°C).
  • “Optimum temperature” represents this region in the exemplary shading shown on the bottom right of fig. 6, “> Optimum temperature” denotes a temperature range of 55 (°C) or greater, and “ ⁇ Optimum temperature” denotes a temperature range of 60 (°C) or less.
  • the optimum temperature range depends on the material and size, etc. of the unsealing device. The determination of conformity or non-conformity of the unsealing device will be described in greater detail here.
  • the narrow regions in two locations corresponding to the leg portions 15 are within the optimum temperature range, so the welding strength is deemed to be sufficient, in other words the unsealing device is deemed to be conforming.
  • the other portions of the ring are within the optimum temperature range. In the case of fig.
  • the narrow regions in two locations corresponding to the leg portions 15 are within the optimum temperature range, and although the other portions of the ring have a temperature distribution beyond the optimum temperature, the welding strength is deemed to be sufficient, as mentioned above, in other words the unsealing device is deemed to be conforming.
  • the narrow regions in two locations corresponding to the leg portions 15 are within the optimum temperature range, and the other portions of the ring have a temperature distribution below the optimum temperature, but the welding strength is deemed to be sufficient, as mentioned above, in other words the unsealing device is deemed to be conforming.
  • the welding strength is deemed to be insufficient, in other words the unsealing device is deemed to be non- conforming when the regions in two locations corresponding to the leg portions 15 are beyond the optimum temperature or below the optimum temperature, even if the other portions of the ring are within the optimum temperature range, although this is not depicted.
  • the inspection device for inspecting the strength of welding to the cap 20 of the unsealing device 1 in which the inner cover 14 is welded to the cap 20 via the linking portion 12 comprises: the infrared camera (not depicted) for acquiring, as two- dimensional distribution data, the wavelength and intensity of infrared radiation emitted from the surface of the cap 20; and the image processing device (not depicted) for imaging the temperature distribution on the surface of the cap from the two-dimensional wavelength distribution data.
  • the infrared camera for acquiring, as two- dimensional distribution data, the wavelength and intensity of infrared radiation emitted from the surface of the cap 20
  • the image processing device not depicted
  • Commercially-available devices may be used for the infrared camera and the image processing device.
  • the infrared camera instead of using the infrared camera to measure the temperature distribution on the surface of the cap from the two-dimensional wavelength data so as to determine the temperatures at the positions of the leg portions 15, it is equally possible to measure a plurality of temperatures at the positions of the leg portions using an infrared radiation thermometer capable of measuring the temperature in a narrow circular region, and to determine the conformity or non-conformity of the welding strength according to whether all of those temperatures are within the predetermined temperature range.
  • the positions of the leg portions 15 are preferably constant in individual containers in this method. When the plurality of leg portions 15 are measured at the same time, a plurality of infrared radiation thermometers should be prepared correspondingly with the number of leg portions 15.
  • Patent Document 1 which is a patent application of the applicant of this case is cited herein in regard to general concepts outside the characterizing sections of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Cartons (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Radiation Pyrometers (AREA)
  • Closures For Containers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Après un temps prédéterminé après l'achèvement du soudage sur un capuchon, des températures dans des régions sur la surface du capuchon correspondant à une pluralité de parties de patte d'une portion de liaison pour relier un couvercle interne et le capuchon sont mesurées, et lorsque toutes les températures se situent dans une plage prédéterminée dans laquelle une résistance du soudage suffisante est démontrée pour que le couvercle interne soit libéré du contenant d'emballage en même temps que le capuchon, la résistance du soudage est jugée suffisante, et lorsque lesdites températures sont en dehors de ladite plage de température, la résistance du soudage est jugée insuffisante.
PCT/EP2020/085373 2019-12-17 2020-12-09 Procédé et dispositif d'inspection de la résistance du soudage de capuchon de contenant d'emballage Ceased WO2021122244A1 (fr)

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JP2019-227098 2019-12-17
JP2019227098A JP6695489B1 (ja) 2019-12-17 2019-12-17 包装容器上蓋の融着強度検査方法及び装置

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WO2025083054A1 (fr) * 2023-10-18 2025-04-24 TriVision A/S Procédé et système d'inspection de joint dans des machines d'emballage et des machines d'operculage des barquettes
IT202300027234A1 (it) * 2023-12-19 2025-06-19 Tetra Laval Holdings & Finance Sistema di ispezione per una macchina tappatrice e metodo di ispezione di strutture di chiusura preapplicate su pacchetti contenenti un prodotto colabile

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JP2026511150A (ja) * 2023-03-24 2026-04-10 テトラ ラバル ホールディングス アンド ファイナンス エス エイ 開口装置の異常検出方法

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EP2886479A1 (fr) * 2013-12-23 2015-06-24 Tetra Laval Holdings & Finance S.A. Dispositif d'ouverture pour récipient et procédé de production d'un tel dispositif d'ouverture
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JP5808682B2 (ja) * 2012-01-31 2015-11-10 ハウス食品グループ本社株式会社 高周波誘導加熱による内蓋加熱温度の適否判定方法

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JP2002318213A (ja) 2002-01-28 2002-10-31 Knorr Foods Co Ltd 高周波アルミシールの非接触検査法
WO2014178056A1 (fr) * 2013-05-02 2014-11-06 D.I.R. Technologies (Detection Ir) Ltd. Procédé thermographique pour la détection de défauts dans les joints comprenant des joints intérieurs conducteurs
EP2886479A1 (fr) * 2013-12-23 2015-06-24 Tetra Laval Holdings & Finance S.A. Dispositif d'ouverture pour récipient et procédé de production d'un tel dispositif d'ouverture
JP2017504534A (ja) 2013-12-23 2017-02-09 テトラ・ラヴァル・ホールディングス・アンド・ファイナンス・ソシエテ・アノニムＴｅｔｒａ Ｌａｖａｌ Ｈｏｌｄｉｎｇｓ ＆ Ｆｉｎａｎｃｅ Ｓ．Ａ． 容器のためのオープニングデバイスおよびそうしたオープニングデバイスを製造するための方法
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WO2025083054A1 (fr) * 2023-10-18 2025-04-24 TriVision A/S Procédé et système d'inspection de joint dans des machines d'emballage et des machines d'operculage des barquettes
IT202300027234A1 (it) * 2023-12-19 2025-06-19 Tetra Laval Holdings & Finance Sistema di ispezione per una macchina tappatrice e metodo di ispezione di strutture di chiusura preapplicate su pacchetti contenenti un prodotto colabile
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