WO2020053049A1 - A method for forming a tube and a method and a packaging machine for forming a package - Google Patents

A method for forming a tube and a method and a packaging machine for forming a package Download PDF

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Publication number
WO2020053049A1
WO2020053049A1 PCT/EP2019/073595 EP2019073595W WO2020053049A1 WO 2020053049 A1 WO2020053049 A1 WO 2020053049A1 EP 2019073595 W EP2019073595 W EP 2019073595W WO 2020053049 A1 WO2020053049 A1 WO 2020053049A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
tube
lateral edge
packaging material
internal
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/EP2019/073595
Other languages
French (fr)
Inventor
Paolo SANIBONDI
Claudio Ferrari
Filippo Ferrarini
Nicola MACINI
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
Priority to JP2021513343A priority Critical patent/JP2022500316A/en
Priority to CN201980057504.8A priority patent/CN112672875B/en
Priority to BR112021002694-0A priority patent/BR112021002694B1/en
Priority to US17/250,839 priority patent/US11548238B2/en
Publication of WO2020053049A1 publication Critical patent/WO2020053049A1/en
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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1454—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1458—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined once, i.e. contour welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1632—Laser beams characterised by the way of heating the interface direct heating 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/5042—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 covering both elements 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
    • B29C65/48—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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—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
    • B29C66/7234—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 barrier layer
    • B29C66/72341—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 barrier layer for gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/12—Subdividing filled tubes to form two or more packages by sealing or securing involving displacement of contents
    • 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
    • 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 for forming a tube from a web of packaging material, in particular a web of packaging material for the formation of packages of a pourable product.
  • the present invention relates to a method for forming packages of a pourable product, in particular a pourable food product.
  • the present invention relates to a packaging machine for forming sealed packages filled with a pourable product .
  • liquid or pourable food products such as fruit juice, UHT (ultra-high-temperature treated) milk, wine, tomato sauce, etc.
  • UHT ultra-high-temperature treated milk
  • wine tomato sauce
  • etc. are sold in packages made of sterilized packaging material.
  • a typical example is the parallelepiped-shaped package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark) , which is made by sealing and folding laminated strip packaging material.
  • the packaging material has a multilayer structure comprising a base layer, e.g. of paper, covered on both sides with layers of heat-seal plastic material, e.g. polyethylene.
  • the packaging material also comprises a layer of oxygen- barrier material, e.g. an aluminum foil, which is superimposed on a layer of heat-seal plastic material, and is in turn covered with another layer of heat-seal plastic material forming the inner face of the package eventually contacting the food product.
  • Packages of this sort are normally produced on fully automatic packaging machines, which advance a web of packaging material through a sterilization unit of the packaging machine for sterilizing the web of packaging material, e.g. by means of chemical sterilization (e.g. by applying a chemical sterilizing agent, such as a hydrogen peroxide solution) or physical sterilization (e.g. by means of an electron beam) . Then, the sterilized web of packaging material is maintained and advanced within an isolation chamber (a closed and sterile environment) , and is folded and sealed longitudinally along a seam portion to form a tube, which is further fed along a vertical advancing direction.
  • chemical sterilizing agent such as a hydrogen peroxide solution
  • physical sterilization e.g. by means of an electron beam
  • the tube is continuously filled with a sterilized or sterile-processed pourable food product, and is transversally sealed and subsequently cut along equally spaced transversal cross sections within a package forming unit of the packaging machine during advancement along the vertical advancing direction.
  • Pillow packages are so obtained within the packaging machine, each pillow package having a longitudinal sealing band and a pair of top and bottom transversal sealing bands.
  • a sealing strip of heat-seal plastic material is applied onto an initial web of packaging material and sealed onto the initial web of packaging material for obtaining the web of packaging material from which the tube is formed.
  • the web of packaging material is folded such that the sealing strip is in contact with a portion of the inner side of the tube. In other words, once the final package has been obtained the sealing strip is in contact with the pourable product and avoids that lateral portions of the edge of the web of packaging material, which is positioned within an inner space of the tube, get into contact with the pourable product.
  • a first lateral edge and a second lateral edge of the web of packaging material are overlapped, whereby the second lateral edge is arranged within the inner space of the formed tube.
  • an internal outer surface of the first lateral edge facing the inner space is in contact with an external outer surface of the second lateral edge facing the internal outer surface of the first lateral edge.
  • the internal outer surface of the first lateral edge and the external outer surface of the second lateral edge are thermally fused to one another.
  • the necessary thermal energy (heat) is provided by inductively heating e.g. the aluminum layer if present or by directing a stream of hot air onto the first lateral edge.
  • Figure 1 is a schematic view of a packaging machine according to the present invention, with parts removed for clarity;
  • Figure 2 is a schematic view of a portion of a web of packaging material, with parts removed for clarity;
  • Figure 3 schematically illustrates a step during the formation of a tube according to a first embodiment, with parts removed for clarity;
  • Figure 4 schematically illustrates an example package according to a first embodiment, with parts removed for clarity;
  • Figure 5 schematically illustrates a step during the formation of a tube according to a second embodiment, with parts removed for clarity;
  • Figure 6 schematically illustrates an example package according to a second embodiment, with parts removed for clarity.
  • Number 1 indicates as a whole a packaging machine for producing sealed packages 2 of a pourable product, in particular a (sterilized or sterile-processed) pourable food product such as pasteurized milk, fruit juice, wine, tomato sauce, etc., from a tube 3 of a web 4 of packaging material.
  • tube 3 extends along a longitudinal axis A, preferentially having a vertical orientation.
  • web 4 comprises at least an initial web 5 of packaging material having a multi-layer structure.
  • web 4 in particular initial web 5 has at least a layer of fibrous material 6, in particular paper or cardboard, and at least a first layer 7 of heat-seal plastic material and a second layer 8 of heat-seal plastic material.
  • first layer 7 and second layer 8 interpose layer of fibrous material 6 between one another and define the outer faces of initial web 5.
  • the heat-seal plastic material is polyethylene
  • web 4 in particular initial web 5 also comprises a layer of gas- and light-barrier material 9, e.g. an aluminum foil or an ethylene vinyl alcohol (EVOH) film, interposed between layer of fibrous material 6 and first layer 7.
  • gas- and light-barrier material e.g. an aluminum foil or an ethylene vinyl alcohol (EVOH) film
  • web 4 in particular initial web 5, also comprises a third layer 10 of heat-seal plastic material, in particular of polyethylene, preferably third layer 10 being interposed between layer of fibrous material 6 and layer of gas- and light-barrier material 9.
  • second layer 8 forms an inner face of tube 3 and/or package 2 eventually contacting the filled in pourable food product.
  • second layer 8 defines an internal surface of web 4 and/or initial web 5 and, in particular first layer 7 defines an outer surface of web 4, opposite to the internal surface. In use, the internal surface gets into and/or is in contact with the pourable product during filling of tube 3.
  • web 4 also comprises a sealing strip 11 of heat-seal plastic material applied and/or fused onto initial web 5.
  • sealing strip 11 is applied to and/or fused onto at least a portion of the internal surface of initial web 5, even more particular onto a portion of second layer 8, preferentially in the area of one edge of initial web 5 (in particular the edge of initial web 5 which will, after formation of tube 3 (and/or packages 2) be arranged within tube 3 (and/or packages 2).
  • web 4 comprises sealing strip 11 so as to avoid that the packaging material may absorb the pourable product during or after the filling process.
  • sealing strip 11 provides for an improved strength and improved gas barrier properties of the seam portion.
  • sealing strip 11 is applied to and/or fused onto at least a portion of the outer surface, in particular first layer 7, preferentially in the area of one edge of initial web 5.
  • sealing strip 11 applied to initial web 5 presents a C-shaped cross- sectional profile with respect to a cross-sectional plane being transversal, in particular orthogonal, to a longitudinal axis of web 4 and/or with respect to a cross-sectional plane being transversal, in particular orthogonal to longitudinal axis A.
  • a typical package 2 obtained by packaging machine 1 comprises a longitudinal seal portion and a pair of transversal sealing bands, in particular a transversal top sealing band and a transversal bottom sealing band.
  • packaging machine 1 comprises:
  • a conveying device 16 configured to advance web 4 along a web advancement path P at least to a tube forming station 17 at which web 4 is formed, in use, into tube 3 and for advancing tube 3 along a tube advancement path Q;
  • a tube forming device 18 configured to form tube 3 at tube forming station 17 by overlapping a first lateral edge 19 of web 4 and a second lateral edge 20 of web 4, in particular being opposite to first lateral edge 19, for obtaining a longitudinal seam portion of tube 3;
  • packaging machine 1 also comprises an isolation chamber 22 extending along a respective longitudinal axis, in particular being parallel to axis A, even more particular having a vertical orientation, and delimiting an inner (aseptic) environment from an outer environment.
  • isolation chamber 22 houses at least some portions of tube forming device 18 and sealing device 21 so that, in use, the formation and the longitudinal sealing of tube 3 occurs within isolation chamber 22 (i.e. within the isolated inner environment) .
  • packaging machine 1 also comprises:
  • a sterilization apparatus for sterilizing at least a portion of web 4 at a sterilization station arranged upstream of tube forming station 17 along web advancement path P, in particular by a chemical sterilization (hydrogen peroxide) and/or physical sterilization (electron beam irradiation) ;
  • a package forming unit 24 configured to at least form and transversally seal tube 3, preferentially to also transversally cut tube 3, for obtaining packages 2, in particular during advancement of tube 3 along tube advancement path Q.
  • packaging machine 1 also comprises a magazine unit 25 configured to host initial web 5 and/or web 4 at a host station 26.
  • magazine unit 25 is configured to host a reel of initial web 5 at host station 26.
  • packaging machine 1 also comprises a strip application unit 27 configured to apply sealing strip 11 onto initial web 5 at an application station 28.
  • conveying device 16 is configured to advance initial web 5 from host station 26 to application station 28 and web 4 from application station 28 to tube forming station 17.
  • sealing strip 11 is applied onto initial web 5 during operation of packaging machine 1.
  • magazine unit 25 could be configured to host a reel of web 4 and conveying device 16 is configured to advance web 4 from host station 26 to tube forming station 17.
  • sealing strip 11 is applied to initial web 5 prior to operation of packaging machine 1, e.g. at a web production plant.
  • the sterilization apparatus is arranged upstream of isolation chamber 22 along path P so that, in use, web 4 is sterilized prior to web 4 being formed into tube 3.
  • the sterilization apparatus is arranged downstream of magazine unit 25 and/or strip application unit 27 along path P.
  • package forming unit 24 is arranged downstream of isolation chamber 22, tube forming device 18 and sealing device 21 along path Q.
  • conveying device 16 is configured to advance tube 3 and any intermediate of tube 3 in a manner known as such along path Q, in particular from tube forming station 17 through at least a portion of isolation chamber 22, in particular towards and at least partially through package forming unit 24.
  • any configuration of web 4 is meant prior to obtaining the tube structure and after folding of web 4 by tube forming device 18 has started.
  • the intermediates of tube 3 are a result of the gradual folding of web 4 so as to obtain tube 3, in particular by overlapping the opposite first lateral edge 19 and second lateral edge 20 with one another.
  • filling device 23 comprises at least a filling tube 32 being in fluid connection with a pourable product storage tank (not shown and known as such) and partially extending within isolation chamber 22.
  • filling tube 32 is at least partially placed within tube 3 for feeding the pourable product into the, in use, advancing tube 3.
  • tube 3 has an inner space 33 delimited by web 4.
  • inner space 33 is, in use, at least partially or becomes at least partially filled with the pourable product .
  • second lateral edge 20 is arranged within inner space 33 after formation of tube 3 (i.e. second lateral edge 20 is arranged at and/or defines an inner portion of tube 3 after formation of tube 3) .
  • second lateral edge 20 comes into contact with the pourable product after formation and filling of tube 3.
  • first lateral edge 19 is arranged outside inner space 33 (i.e. first lateral edge 19 is arranged at and/or defines an outer portion of tube 3) .
  • second lateral edge 20 comprises sealing strip 11.
  • second lateral edge 20 comprises the edge of initial web 5 to which sealing strip 11 is applied and/or fused and sealing strip 11.
  • sealing strip 11 avoids that the lateral border of second lateral edge 20 gets into contact with the pourable product .
  • first lateral edge 19 comprises a respective internal outer surface 34 facing inner space 33 and a respective external outer surface 35 opposite (and parallel) to internal outer surface 34.
  • internal outer surface 34 and external outer surface 35 are defined by respective portions of respectively second layer 8 and first layer 7 in the proximity of first lateral edge 19.
  • second lateral edge 20 comprises a respective internal outer surface 36 facing inner space 33 and a respective external outer surface 37 opposite (and parallel) to internal outer surface 36.
  • internal outer surface 36 is defined by at least a portion of sealing strip 11 (this latter portion being applied and/or fused to a portion of the internal surface of web 4); and, in particular external outer surface 37 is defined by at least another portion of sealing strip 11 (this latter another portion being applied and/or fused to a portion of the outer surface of web 4) .
  • external outer surface 37 faces internal outer surface 34. According to the more detailed description further below, during the formation and longitudinal sealing of tube 3 external outer surface 37 and internal outer surface 34 become contacted and fused to one another.
  • tube forming device 18 comprises at least a plurality of forming ring assemblies 38, in the particular example shown two, being adapted to fold web 4 gradually into tube 3 by gradually overlapping first lateral edge 19 and second lateral edge 20 with one another.
  • forming ring assemblies 38 are arranged within parallel and spaced apart planes, in particular being orthogonal to axis A, even more specifically having a substantially horizontal orientation.
  • forming ring assemblies 38 are arranged within isolation chamber 22.
  • sealing device 21 is configured to longitudinal seal the seam portion by fusing internal outer surface 34 and the external outer surface 37 with one another.
  • sealing device 21 comprises a heating unit 39 configured to (solely) directly heat the external outer surface 37, in particular without heating internal surface 34.
  • heating unit 39 is configured such that, in use, internal outer surface 34 is (solely) heated through establishing contact between internal outer surface 34 and the directly heated external outer surface 37 and the transfer of thermal energy (heat) from external outer surface 37 to internal outer surface 34.
  • the temperature of internal outer surface 34 is lower than the temperature of external outer surface 37.
  • the temperature of internal outer surface 34 is substantially identical to the ambient temperature (i.e. the temperature within the inner environment of isolation chamber 22) .
  • heating unit 39 is arranged within isolation chamber 22.
  • heating unit 39 is configured to direct a stream of hot gas, in particular hot (sterile) air, onto external outer surface 37.
  • hot gas in particular hot (sterile) air
  • heating unit 39 could be configured to heat external outer surface 37 by any heating means, e.g. a ray of laser light, by a plasma and/or by electron-beam irradiation.
  • any heating means e.g. a ray of laser light, by a plasma and/or by electron-beam irradiation.
  • heating unit 39 is configured to heat external outer surface 37 to a temperature allowing to change the physical state of external outer surface 37 and, in particular to allow the fusion of internal outer surface 34 and external outer surface 37 with one another .
  • sealing device 21 also comprises a pressing assembly configured to exert a mechanical force onto the seam portion for promoting the longitudinal sealing.
  • a pressing assembly configured to exert a mechanical force onto the seam portion for promoting the longitudinal sealing.
  • at least a portion of the pressing assembly is arranged on the forming ring assembly 38 arranged downstream of the other one along path Q.
  • package forming unit 24 comprises a plurality of complementary pairs of operative units (not shown and known as such) configured to at least shape and transversally seal, in particular also to transversally cut, tube 3 for defining and/or obtaining packages 2.
  • packaging machine 1 forms packages 2 filled with the pourable product .
  • operation of packaging machine 1 comprises at least the following steps:
  • operation of packaging machine 1 also comprises the step of applying sealing strip 11 to initial web 5 for obtaining web 4 and, preferentially but not necessarily also the step of advancing initial web 5, in particular from host station 26, to application station 28 at which sealing strip 11 is applied and/or fused to initial web 5 during the step of application.
  • operation of packaging machine 1 also comprises the steps of:
  • conveying device 16 advances web 4 along path P to tube forming station 17 and, in particular from application station 28 or host station 26.
  • conveying device 16 advances web 4 through the sterilization station.
  • At least a portion of web 4 is sterilized by chemical sterilization (e.g. by the application of hydrogen peroxide or by advancing through an hydrogen peroxide atmosphere or by advancing through an hydrogen peroxide bath) and/or by physical sterilization (e.g. by the application of a sterilization irradiation such as electromagnetic irradiation (UV light) , electron beam irradiation, x-ray irradiation, gamma-ray irradiation, beta-ray irradiation) .
  • chemical sterilization e.g. by the application of hydrogen peroxide or by advancing through an hydrogen peroxide atmosphere or by advancing through an hydrogen peroxide bath
  • physical sterilization e.g. by the application of a sterilization irradiation such as electromagnetic irradiation (UV light) , electron beam irradiation, x-ray irradiation, gamma-ray irradiation, beta-ray irradiation
  • filling device 23 fills tube 3 with the pourable product, in particular the pourable product flows form the product storage tank through filling tube 32 into tube 3.
  • tube 3 advances towards and through at least a portion of package forming unit 24.
  • conveying device 16 advances tube 3 through a portion of isolation chamber 22 and into package forming unit 24.
  • the complementary pairs of operative units interact with the advancing tube 3 and shape and transversally seal, in particular also transversally cut, tube 3 for defining and/or obtaining single packages 2.
  • first lateral edge 19 and second lateral edge 20 are determined and/or controlled by tube forming device 18, in particular by at least forming ring assemblies 38.
  • web 4 advances along path P and interacts with tube forming device 18, in particular with at least forming ring assemblies 38.
  • the step of fusing comprises at least the sub-steps of:
  • internal outer surface 34 is heated by contact with external outer surface 37 due to a transfer of thermal energy (heat) from external outer surface 37 to internal outer surface 34.
  • thermal energy heat
  • internal outer surface 34 is subjected to a change of its temperature and therewith to a change of the physical state and/or phase of internal outer surface 34 solely upon contact with external outer surface 37.
  • the thermal energy (heat) for fusing external outer surface 37 and internal outer surface 34 with one another results only from the directly heated external outer surface 37.
  • the temperature of internal outer surface 34 is lower than the temperature of external outer surface 37.
  • the temperature of internal outer surface 34 is substantially equal to the ambient temperature (i.e. the temperature within the inner environment of isolation chamber 22) .
  • internal outer surface 34 and external outer surface 37 are of heat-seal plastic material, in particular polyethylene .
  • external outer surface 37 is defined by a portion of sealing strip 11 (in the proximity of second lateral edge 20) .
  • internal outer surface 34 is defined by a portion of second layer 8 (in the proximity of fist lateral edge 19) .
  • heating unit 39 directly heats external outer surface 37.
  • heating unit 39 directs a flow of a heated gas onto external outer surface 37 or, alternatively heating unit 39 heats external outer surface 37 by a ray of laser light, by a plasma, by electron-beam irradiation or a combination thereof.
  • operation of packaging machine 1 also comprises a step of pressing, in particular executed after and/or during the step of fusing, during which a mechanical force is exerted on the seam portion, in particular by the pressing assembly, so as to further strengthen the sealed seam portion .
  • the sealing strip 11 is applied onto initial web 5 at application station 28.
  • sealing strip 11 is applied, in particular fused, onto at least the internal surface of initial web 5.
  • at least another portion of sealing strip 11 is applied onto the external surface of initial web 5.
  • sealing strip 11 is applied to initial web 5 at second lateral edge 20.
  • number 4' indicates an alternative embodiment of a web of packaging material used and/or useable for the formation of tube 3; as web 4' and its handling by packaging machine 1 is similar to web 4 and its handling by packaging machine 1, the following description is limited to the differences between them, and using the same references, where possible, for identical or corresponding parts.
  • web 4' differs from web 4 in how sealing strip 11 is applied and/or fused onto the respective initial web 5.
  • a portion of sealing strip 11 is applied and/or fused onto the internal surface of initial web 5 (i.e. a portion of second layer 8 in the proximity of second lateral edge 20) and another portion of sealing strip 11 is, at least until the final formation of tube 3, free (it is a free portion; i.e. it is not applied and/or fused to initial web 5) .
  • a portion of sealing strip 11 is applied and/or fused onto initial web 5 and the another portion not being applied and/or fused protrudes away from initial web 5.
  • sealing strip 11 After formation of tube 3 (and/or packages 2), sealing strip 11 presents a substantially S-like cross-sectional profile with respect to a cross- sectional plane being transversal, in particular orthogonal to longitudinal axis A.
  • external outer surface 37 is defined by the free portion of sealing strip 11 and, preferentially but not necessarily a portion of first layer 7 in the proximity of second lateral edge 20.
  • sealing strip 11 is applied and/or fused onto the internal surface of initial web 5.
  • Another advantage resides in that the overall energy consumption for obtaining the sealed seam portion is reduced as only a limited portion of web 4 is heated.
  • a further advantage resides in that the overall heating process during the longitudinal sealing of the seam portion is further increased.
  • An even other advantage is that only surface portions of web 4 are heated.
  • a web of packaging material having e.g. an aluminum layer the heat diffuses from the inner of web 4 towards and to the outside, leading to a limited control of the overall heating process and heating also portions of web 4 (e.g. second layer 8), which are not necessary for obtaining a good sealing of the seam portion.
  • web 4 does not comprise sealing strip 11.
  • web 4 is substantially identical to initial web 5.
  • external outer surface 37 is defined by a portion of first layer 7 in the proximity of second lateral edge 20. Accordingly, in use, the above-mentioned portion of first layer 7 is directly heated for allowing the fusion of external outer surface 37 and internal outer surface 34 to one another.

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Abstract

There is described a method for forming a tube (3) of a web (4, 4') of packaging material comprising the steps of advancing the web (4) of packaging material along a web advancement path (P), overlapping a first lateral edge (19) of the web (4, 4') of packaging material with a second lateral edge (20) of the web (4, 4') of packaging material for obtaining a longitudinal seam portion of the tube (3) and fusing at least an internal outer surface (34) of the first lateral edge (19) and an external outer surface (37) of the second lateral edge (20) with one another for longitudinally sealing the seam portion of the tube (3). The step of fusing comprises at least the sub-steps of directly heating the external outer surface (37) of the second lateral edge (20) and heating by contact the internal outer surface (34) by establishing contact between the internal outer surface (34) and the directly heated external outer surface (37).

Description

A METHOD FOR FORMING A TUBE AND A METHOD AND A PACKAGING MACHINE FOR FORMING A PACKAGE
TECHNICAL FIELD
The present invention relates to a method for forming a tube from a web of packaging material, in particular a web of packaging material for the formation of packages of a pourable product.
Furthermore, the present invention relates to a method for forming packages of a pourable product, in particular a pourable food product.
Furthermore, the present invention relates to a packaging machine for forming sealed packages filled with a pourable product .
BACKGROUND ART
As is known, many liquid or pourable food products, such as fruit juice, UHT (ultra-high-temperature treated) milk, wine, tomato sauce, etc., are sold in packages made of sterilized packaging material.
A typical example is the parallelepiped-shaped package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark) , which is made by sealing and folding laminated strip packaging material. The packaging material has a multilayer structure comprising a base layer, e.g. of paper, covered on both sides with layers of heat-seal plastic material, e.g. polyethylene. In the case of aseptic packages for long-storage products, such as UHT milk, the packaging material also comprises a layer of oxygen- barrier material, e.g. an aluminum foil, which is superimposed on a layer of heat-seal plastic material, and is in turn covered with another layer of heat-seal plastic material forming the inner face of the package eventually contacting the food product.
Packages of this sort are normally produced on fully automatic packaging machines, which advance a web of packaging material through a sterilization unit of the packaging machine for sterilizing the web of packaging material, e.g. by means of chemical sterilization (e.g. by applying a chemical sterilizing agent, such as a hydrogen peroxide solution) or physical sterilization (e.g. by means of an electron beam) . Then, the sterilized web of packaging material is maintained and advanced within an isolation chamber (a closed and sterile environment) , and is folded and sealed longitudinally along a seam portion to form a tube, which is further fed along a vertical advancing direction.
In order to complete the forming operations, the tube is continuously filled with a sterilized or sterile-processed pourable food product, and is transversally sealed and subsequently cut along equally spaced transversal cross sections within a package forming unit of the packaging machine during advancement along the vertical advancing direction.
Pillow packages are so obtained within the packaging machine, each pillow package having a longitudinal sealing band and a pair of top and bottom transversal sealing bands.
Furthermore, prior to the folding and the longitudinal sealing of the web of packaging material a sealing strip of heat-seal plastic material is applied onto an initial web of packaging material and sealed onto the initial web of packaging material for obtaining the web of packaging material from which the tube is formed. The web of packaging material is folded such that the sealing strip is in contact with a portion of the inner side of the tube. In other words, once the final package has been obtained the sealing strip is in contact with the pourable product and avoids that lateral portions of the edge of the web of packaging material, which is positioned within an inner space of the tube, get into contact with the pourable product.
More specifically, during the folding of the web of packaging material a first lateral edge and a second lateral edge of the web of packaging material are overlapped, whereby the second lateral edge is arranged within the inner space of the formed tube. In particular, an internal outer surface of the first lateral edge facing the inner space is in contact with an external outer surface of the second lateral edge facing the internal outer surface of the first lateral edge. In order to seal the longitudinal seam portion, the internal outer surface of the first lateral edge and the external outer surface of the second lateral edge are thermally fused to one another. Typically, the necessary thermal energy (heat) is provided by inductively heating e.g. the aluminum layer if present or by directing a stream of hot air onto the first lateral edge.
Even though the known methods of forming the tube and the packages and the known packaging machines work satisfyingly well, a need is felt to further improve the respective methods and packaging machines.
In particular, a need is felt to increase the efficiency in order to allow for energy savings and/or to decrease the critical time during which the newly formed and sealed seam portion may collapse (i.e. open and/or lose integrity) during further advancement of the tube .
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a method for forming a tube for achieving at least one of the above mentioned aims in a straightforward and low-cost manner.
It is a further object of the present invention to provide a method for forming packages of a pourable product for achieving at least one of the above aims in a straightforward and low-cost manner.
It is a further object of the present invention to provide a packaging machine for achieving at least one of the above aims in a straightforward and low-cost manner .
According to the present invention, there is provided a method and a packaging machine according to the independent claims.
Further advantageous embodiments according to the present invention are specified in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Two non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a schematic view of a packaging machine according to the present invention, with parts removed for clarity;
Figure 2 is a schematic view of a portion of a web of packaging material, with parts removed for clarity;
Figure 3 schematically illustrates a step during the formation of a tube according to a first embodiment, with parts removed for clarity;
Figure 4 schematically illustrates an example package according to a first embodiment, with parts removed for clarity;
Figure 5 schematically illustrates a step during the formation of a tube according to a second embodiment, with parts removed for clarity; and
Figure 6 schematically illustrates an example package according to a second embodiment, with parts removed for clarity.
BEST MODES FOR CARRYING OUT THE INVENTION
Number 1 indicates as a whole a packaging machine for producing sealed packages 2 of a pourable product, in particular a (sterilized or sterile-processed) pourable food product such as pasteurized milk, fruit juice, wine, tomato sauce, etc., from a tube 3 of a web 4 of packaging material. In particular, in use, tube 3 extends along a longitudinal axis A, preferentially having a vertical orientation.
With particular reference to Figure 2, web 4 comprises at least an initial web 5 of packaging material having a multi-layer structure.
In more detail, web 4, in particular initial web 5, has at least a layer of fibrous material 6, in particular paper or cardboard, and at least a first layer 7 of heat-seal plastic material and a second layer 8 of heat-seal plastic material. In particular, first layer 7 and second layer 8 interpose layer of fibrous material 6 between one another and define the outer faces of initial web 5.
Preferentially but not necessarily, the heat-seal plastic material is polyethylene.
In the non-limiting example embodiment of Figure 2, web 4, in particular initial web 5, also comprises a layer of gas- and light-barrier material 9, e.g. an aluminum foil or an ethylene vinyl alcohol (EVOH) film, interposed between layer of fibrous material 6 and first layer 7.
In a preferred non-limiting embodiment, web 4, in particular initial web 5, also comprises a third layer 10 of heat-seal plastic material, in particular of polyethylene, preferably third layer 10 being interposed between layer of fibrous material 6 and layer of gas- and light-barrier material 9.
In a preferred non-limiting embodiment, second layer 8 forms an inner face of tube 3 and/or package 2 eventually contacting the filled in pourable food product. In other words, second layer 8 defines an internal surface of web 4 and/or initial web 5 and, in particular first layer 7 defines an outer surface of web 4, opposite to the internal surface. In use, the internal surface gets into and/or is in contact with the pourable product during filling of tube 3.
In a preferred non-limiting embodiment, web 4 also comprises a sealing strip 11 of heat-seal plastic material applied and/or fused onto initial web 5. In particular, at least a portion of sealing strip 11 is applied to and/or fused onto at least a portion of the internal surface of initial web 5, even more particular onto a portion of second layer 8, preferentially in the area of one edge of initial web 5 (in particular the edge of initial web 5 which will, after formation of tube 3 (and/or packages 2) be arranged within tube 3 (and/or packages 2).
In particular, web 4 comprises sealing strip 11 so as to avoid that the packaging material may absorb the pourable product during or after the filling process.
Furthermore sealing strip 11 provides for an improved strength and improved gas barrier properties of the seam portion.
According to the embodiment shown in Figures 2 to 4, at least another portion of sealing strip 11 is applied to and/or fused onto at least a portion of the outer surface, in particular first layer 7, preferentially in the area of one edge of initial web 5.
Preferably but not necessarily, sealing strip 11 applied to initial web 5 presents a C-shaped cross- sectional profile with respect to a cross-sectional plane being transversal, in particular orthogonal, to a longitudinal axis of web 4 and/or with respect to a cross-sectional plane being transversal, in particular orthogonal to longitudinal axis A.
A typical package 2 obtained by packaging machine 1 comprises a longitudinal seal portion and a pair of transversal sealing bands, in particular a transversal top sealing band and a transversal bottom sealing band.
With particular reference to Figure 1, packaging machine 1 comprises:
- a conveying device 16 configured to advance web 4 along a web advancement path P at least to a tube forming station 17 at which web 4 is formed, in use, into tube 3 and for advancing tube 3 along a tube advancement path Q;
- a tube forming device 18 configured to form tube 3 at tube forming station 17 by overlapping a first lateral edge 19 of web 4 and a second lateral edge 20 of web 4, in particular being opposite to first lateral edge 19, for obtaining a longitudinal seam portion of tube 3; and
- a sealing device 21 configured to longitudinally seal tube 3 along the longitudinal seam portion. In a preferred non-limiting embodiment, packaging machine 1 also comprises an isolation chamber 22 extending along a respective longitudinal axis, in particular being parallel to axis A, even more particular having a vertical orientation, and delimiting an inner (aseptic) environment from an outer environment. Preferentially, isolation chamber 22 houses at least some portions of tube forming device 18 and sealing device 21 so that, in use, the formation and the longitudinal sealing of tube 3 occurs within isolation chamber 22 (i.e. within the isolated inner environment) .
In a preferred non-limiting embodiment, packaging machine 1 also comprises:
a sterilization apparatus (not shown) for sterilizing at least a portion of web 4 at a sterilization station arranged upstream of tube forming station 17 along web advancement path P, in particular by a chemical sterilization (hydrogen peroxide) and/or physical sterilization (electron beam irradiation) ;
- a filling device 23 for filling tube 3 with the pourable product; and
- a package forming unit 24 configured to at least form and transversally seal tube 3, preferentially to also transversally cut tube 3, for obtaining packages 2, in particular during advancement of tube 3 along tube advancement path Q.
In a preferred non-limiting embodiment, packaging machine 1 also comprises a magazine unit 25 configured to host initial web 5 and/or web 4 at a host station 26.
In the specific example embodiment shown in Figure 1, magazine unit 25 is configured to host a reel of initial web 5 at host station 26.
In the specific example embodiment shown, packaging machine 1 also comprises a strip application unit 27 configured to apply sealing strip 11 onto initial web 5 at an application station 28. According to this non limiting embodiment, conveying device 16 is configured to advance initial web 5 from host station 26 to application station 28 and web 4 from application station 28 to tube forming station 17. In this non limiting embodiment, sealing strip 11 is applied onto initial web 5 during operation of packaging machine 1.
In an alternative non-limiting embodiment not shown, magazine unit 25 could be configured to host a reel of web 4 and conveying device 16 is configured to advance web 4 from host station 26 to tube forming station 17. In other words, sealing strip 11 is applied to initial web 5 prior to operation of packaging machine 1, e.g. at a web production plant.
In further detail, the sterilization apparatus is arranged upstream of isolation chamber 22 along path P so that, in use, web 4 is sterilized prior to web 4 being formed into tube 3.
Preferentially, the sterilization apparatus is arranged downstream of magazine unit 25 and/or strip application unit 27 along path P.
In particular, package forming unit 24 is arranged downstream of isolation chamber 22, tube forming device 18 and sealing device 21 along path Q.
In more detail, conveying device 16 is configured to advance tube 3 and any intermediate of tube 3 in a manner known as such along path Q, in particular from tube forming station 17 through at least a portion of isolation chamber 22, in particular towards and at least partially through package forming unit 24.
In particular, with intermediates of tube 3 any configuration of web 4 is meant prior to obtaining the tube structure and after folding of web 4 by tube forming device 18 has started. In other words, the intermediates of tube 3 are a result of the gradual folding of web 4 so as to obtain tube 3, in particular by overlapping the opposite first lateral edge 19 and second lateral edge 20 with one another.
With particular reference to Figure 1, filling device 23 comprises at least a filling tube 32 being in fluid connection with a pourable product storage tank (not shown and known as such) and partially extending within isolation chamber 22. In particular, in use, filling tube 32 is at least partially placed within tube 3 for feeding the pourable product into the, in use, advancing tube 3.
With particular reference to Figures 1 and 3, tube 3 has an inner space 33 delimited by web 4. In particular, inner space 33 is, in use, at least partially or becomes at least partially filled with the pourable product .
Preferentially but not necessarily, second lateral edge 20 is arranged within inner space 33 after formation of tube 3 (i.e. second lateral edge 20 is arranged at and/or defines an inner portion of tube 3 after formation of tube 3) . In other words, second lateral edge 20 comes into contact with the pourable product after formation and filling of tube 3. In particular, first lateral edge 19 is arranged outside inner space 33 (i.e. first lateral edge 19 is arranged at and/or defines an outer portion of tube 3) .
In a preferred non-limiting embodiment, second lateral edge 20 comprises sealing strip 11. In other words, second lateral edge 20 comprises the edge of initial web 5 to which sealing strip 11 is applied and/or fused and sealing strip 11. Thus, in use, sealing strip 11 avoids that the lateral border of second lateral edge 20 gets into contact with the pourable product .
More specifically, first lateral edge 19 comprises a respective internal outer surface 34 facing inner space 33 and a respective external outer surface 35 opposite (and parallel) to internal outer surface 34. Preferentially, internal outer surface 34 and external outer surface 35 are defined by respective portions of respectively second layer 8 and first layer 7 in the proximity of first lateral edge 19.
More specifically, second lateral edge 20 comprises a respective internal outer surface 36 facing inner space 33 and a respective external outer surface 37 opposite (and parallel) to internal outer surface 36.
Preferentially but not necessarily, internal outer surface 36 is defined by at least a portion of sealing strip 11 (this latter portion being applied and/or fused to a portion of the internal surface of web 4); and, in particular external outer surface 37 is defined by at least another portion of sealing strip 11 (this latter another portion being applied and/or fused to a portion of the outer surface of web 4) .
In particular, external outer surface 37 faces internal outer surface 34. According to the more detailed description further below, during the formation and longitudinal sealing of tube 3 external outer surface 37 and internal outer surface 34 become contacted and fused to one another.
It should be mentioned that within the context of the present invention, the term "internal" refers to these surfaces, which face inner space 33 and the term "external" refers to these surfaces, which face away from inner space 33.
With particular reference to Figure 1, tube forming device 18 comprises at least a plurality of forming ring assemblies 38, in the particular example shown two, being adapted to fold web 4 gradually into tube 3 by gradually overlapping first lateral edge 19 and second lateral edge 20 with one another. In particular, forming ring assemblies 38 are arranged within parallel and spaced apart planes, in particular being orthogonal to axis A, even more specifically having a substantially horizontal orientation. In particular, forming ring assemblies 38 are arranged within isolation chamber 22.
With particular reference to Figures 1 and 3, sealing device 21 is configured to longitudinal seal the seam portion by fusing internal outer surface 34 and the external outer surface 37 with one another.
In more detail, sealing device 21 comprises a heating unit 39 configured to (solely) directly heat the external outer surface 37, in particular without heating internal surface 34. In other words, heating unit 39 is configured such that, in use, internal outer surface 34 is (solely) heated through establishing contact between internal outer surface 34 and the directly heated external outer surface 37 and the transfer of thermal energy (heat) from external outer surface 37 to internal outer surface 34.
In other words, in use, prior to establishing contact between external outer surface 37 and internal outer surface 34, the temperature of internal outer surface 34 is lower than the temperature of external outer surface 37. In a preferred non-limiting embodiment, in use, prior to establishing contact between external outer surface 37 and internal outer surface 34, the temperature of internal outer surface 34 is substantially identical to the ambient temperature (i.e. the temperature within the inner environment of isolation chamber 22) .
This is advantageous as the time needed for the cooling down of the seam portion is reduced as the heat is transferred from external outer surface 37 to internal outer surface 34. Furthermore, another advantage resides in a reduced overall needed energy consumption .
Preferentially but not necessarily, heating unit 39 is arranged within isolation chamber 22.
In a preferred non-limiting embodiment, heating unit 39 is configured to direct a stream of hot gas, in particular hot (sterile) air, onto external outer surface 37.
Alternatively, heating unit 39 could be configured to heat external outer surface 37 by any heating means, e.g. a ray of laser light, by a plasma and/or by electron-beam irradiation.
In particular, heating unit 39 is configured to heat external outer surface 37 to a temperature allowing to change the physical state of external outer surface 37 and, in particular to allow the fusion of internal outer surface 34 and external outer surface 37 with one another .
In a preferred non-limiting embodiment, sealing device 21 also comprises a pressing assembly configured to exert a mechanical force onto the seam portion for promoting the longitudinal sealing. Preferably but not necessarily, at least a portion of the pressing assembly is arranged on the forming ring assembly 38 arranged downstream of the other one along path Q.
In a preferred non-limiting embodiment, package forming unit 24 comprises a plurality of complementary pairs of operative units (not shown and known as such) configured to at least shape and transversally seal, in particular also to transversally cut, tube 3 for defining and/or obtaining packages 2.
In use, packaging machine 1 forms packages 2 filled with the pourable product .
In more detail, operation of packaging machine 1 comprises at least the following steps:
- advancing web 4 along advancement path P;
- overlapping first lateral edge 19 with second lateral edge 20 for obtaining the longitudinal seam portion; and
- fusing at least internal outer surface 34 and external outer surface 37 with one another for longitudinally sealing the seam portion of tube 3.
In a preferred non-limiting embodiment, operation of packaging machine 1 also comprises the step of applying sealing strip 11 to initial web 5 for obtaining web 4 and, preferentially but not necessarily also the step of advancing initial web 5, in particular from host station 26, to application station 28 at which sealing strip 11 is applied and/or fused to initial web 5 during the step of application.
In a preferred non-limiting embodiment, operation of packaging machine 1 also comprises the steps of:
- sterilizing web 4 at the sterilization station, in particular being executed prior to the step of folding and the step of longitudinally sealing; - filling tube 3 with the pourable product;
- advancing tube 3 along path Q; and
obtaining single packages 2 from tube 3 by forming tube 3, transversally sealing tube 3 between successive packages 2 and, in particular transversally cutting tube 3 between successive packages 2 for obtaining single packages 2.
In more detail, during the step of advancing web 4, conveying device 16 advances web 4 along path P to tube forming station 17 and, in particular from application station 28 or host station 26.
Preferentially but not necessarily, during the step of advancing web 4, conveying device 16 advances web 4 through the sterilization station.
In a preferred non-limiting embodiment, during the step of sterilizing web 4, at least a portion of web 4 is sterilized by chemical sterilization (e.g. by the application of hydrogen peroxide or by advancing through an hydrogen peroxide atmosphere or by advancing through an hydrogen peroxide bath) and/or by physical sterilization (e.g. by the application of a sterilization irradiation such as electromagnetic irradiation (UV light) , electron beam irradiation, x-ray irradiation, gamma-ray irradiation, beta-ray irradiation) .
In a preferred non-limiting embodiment, during the step of filling tube 3, filling device 23 fills tube 3 with the pourable product, in particular the pourable product flows form the product storage tank through filling tube 32 into tube 3.
In a preferred non-limiting embodiment, during the step of advancing tube 3, tube 3 advances towards and through at least a portion of package forming unit 24. In more detail, conveying device 16 advances tube 3 through a portion of isolation chamber 22 and into package forming unit 24.
In a preferred non-limiting embodiment, during the step of obtaining single packages 2, the complementary pairs of operative units interact with the advancing tube 3 and shape and transversally seal, in particular also transversally cut, tube 3 for defining and/or obtaining single packages 2.
In more detail, during the step of overlapping, web
4 is gradually folded into tube 3 by drawing closer and finally overlapping first lateral edge 19 and second lateral edge 20 with one another. In particular, the overlapping of first lateral edge 19 and second lateral edge 20 is determined and/or controlled by tube forming device 18, in particular by at least forming ring assemblies 38.
Advantageously, during the step of overlapping, internal outer surface 34 and external outer surface 37 are brought into contact with one another.
In more detail, during the step of overlapping, web 4 advances along path P and interacts with tube forming device 18, in particular with at least forming ring assemblies 38.
Advantageously, the step of fusing, comprises at least the sub-steps of:
- directly heating external outer surface 37; and
(solely) heating by contact internal outer surface 34 by establishing contact between internal outer surface 34 and the directly heated external outer surface 37.
In particular, internal outer surface 34 is heated by contact with external outer surface 37 due to a transfer of thermal energy (heat) from external outer surface 37 to internal outer surface 34. In particular, in this way, internal outer surface 34 is subjected to a change of its temperature and therewith to a change of the physical state and/or phase of internal outer surface 34 solely upon contact with external outer surface 37. In other words, the thermal energy (heat) for fusing external outer surface 37 and internal outer surface 34 with one another results only from the directly heated external outer surface 37.
Preferentially but not necessarily, prior to the sub-step of heating by contact, the temperature of internal outer surface 34 is lower than the temperature of external outer surface 37.
In a preferred non-limiting embodiment, prior to the sub-step of heating by contact, the temperature of internal outer surface 34 is substantially equal to the ambient temperature (i.e. the temperature within the inner environment of isolation chamber 22) .
This is advantageous, as the time needed for cooling down of the seam portion and/or internal outer surface 34 and external outer surface 37 after the step of fusing is reduced with respect to the known approaches. This again results in a reduced critical time during which a collapse of the seam portion (i.e. opening and/or losing integrity during further advancement of tube 3) may occur.
In the preferred non-limiting embodiment disclosed, internal outer surface 34 and external outer surface 37 are of heat-seal plastic material, in particular polyethylene .
In the specific case shown in Figures 3 and 4, external outer surface 37 is defined by a portion of sealing strip 11 (in the proximity of second lateral edge 20) . Preferentially, internal outer surface 34 is defined by a portion of second layer 8 (in the proximity of fist lateral edge 19) .
In the specific example of Figures 3 and 4, during the sub-step of directly heating, the portion of sealing strip 11 defining external outer surface 37 is directly heated .
In more detail, during the sub-step of directly heating, heating unit 39 directly heats external outer surface 37.
In particular, heating unit 39 directs a flow of a heated gas onto external outer surface 37 or, alternatively heating unit 39 heats external outer surface 37 by a ray of laser light, by a plasma, by electron-beam irradiation or a combination thereof.
Preferentially but not necessarily, operation of packaging machine 1 also comprises a step of pressing, in particular executed after and/or during the step of fusing, during which a mechanical force is exerted on the seam portion, in particular by the pressing assembly, so as to further strengthen the sealed seam portion .
In more detail, during the step of applying, the sealing strip 11 is applied onto initial web 5 at application station 28.
Preferentially but not necessarily, during the step of applying, at least a portion of sealing strip 11 is applied, in particular fused, onto at least the internal surface of initial web 5. In the specific example disclosed in Figures 3 and 4, during the step of applying, at least another portion of sealing strip 11 is applied onto the external surface of initial web 5. In particular, in the specific example disclosed, it is this another portion of sealing strip 11, which defines external outer surface 37 and which becomes fused with internal outer surface 34.
In particular, sealing strip 11 is applied to initial web 5 at second lateral edge 20.
With reference to Figures 5 and 6, number 4' indicates an alternative embodiment of a web of packaging material used and/or useable for the formation of tube 3; as web 4' and its handling by packaging machine 1 is similar to web 4 and its handling by packaging machine 1, the following description is limited to the differences between them, and using the same references, where possible, for identical or corresponding parts.
In particular, web 4' differs from web 4 in how sealing strip 11 is applied and/or fused onto the respective initial web 5. In particular, a portion of sealing strip 11 is applied and/or fused onto the internal surface of initial web 5 (i.e. a portion of second layer 8 in the proximity of second lateral edge 20) and another portion of sealing strip 11 is, at least until the final formation of tube 3, free (it is a free portion; i.e. it is not applied and/or fused to initial web 5) . In other words, a portion of sealing strip 11 is applied and/or fused onto initial web 5 and the another portion not being applied and/or fused protrudes away from initial web 5. After formation of tube 3 (and/or packages 2), sealing strip 11 presents a substantially S-like cross-sectional profile with respect to a cross- sectional plane being transversal, in particular orthogonal to longitudinal axis A. In the specific example shown in Figures 5 and 6, external outer surface 37 is defined by the free portion of sealing strip 11 and, preferentially but not necessarily a portion of first layer 7 in the proximity of second lateral edge 20.
In use, during the sub-step of directly heating, the free portion of sealing strip 11 and the portion of first layer 7 in the proximity of second lateral edge 20 is directly heated and, subsequently, fused to internal outer surface 34.
Preferentially but not necessarily, during the step of applying, only a portion of sealing strip 11 is applied and/or fused onto the internal surface of initial web 5.
The advantages of packaging machine 1 and the method for forming tube 3 according to the present invention will be clear from the foregoing description.
In particular, by directly heating only external outer surface 37 and heating internal outer surface 34 through contact with external outer surface 37 it is achieved that the cooling time of seam portion after sealing is reduced with respect to the known methods. This again means that the risk of a collapse of the seam portion after its longitudinal sealing is reduced during further advancement of tube 3.
Another advantage resides in that the overall energy consumption for obtaining the sealed seam portion is reduced as only a limited portion of web 4 is heated.
A further advantage resides in that the overall heating process during the longitudinal sealing of the seam portion is further increased.
An even other advantage is that only surface portions of web 4 are heated. For example, when inductively heating a web of packaging material having e.g. an aluminum layer, the heat diffuses from the inner of web 4 towards and to the outside, leading to a limited control of the overall heating process and heating also portions of web 4 (e.g. second layer 8), which are not necessary for obtaining a good sealing of the seam portion.
Clearly, changes may be made to packaging machine 1 and/or the method as described herein without, however, departing from the scope of protection as defined in the accompanying claims.
In an alternative embodiment not shown, web 4 does not comprise sealing strip 11. In other words, web 4 is substantially identical to initial web 5. In such an alternative embodiment, external outer surface 37 is defined by a portion of first layer 7 in the proximity of second lateral edge 20. Accordingly, in use, the above-mentioned portion of first layer 7 is directly heated for allowing the fusion of external outer surface 37 and internal outer surface 34 to one another.

Claims

1.- A method for forming a tube (3) of a web (4, 4') of packaging material comprising the steps of:
- advancing the web (4) of packaging material along a web advancement path (P) ;
- overlapping a first lateral edge (19) of the web
(4, 4') of packaging material with a second lateral edge (20) of the web (4, 4') of packaging material for obtaining a longitudinal seam portion of the tube (3); wherein the so obtained tube (3) has an inner space
(33); wherein the second lateral edge (20) is arranged within the inner space (33) after formation of the tube (3); wherein the first lateral edge (19) comprises an internal outer surface (34) facing the inner space (33) and the second lateral edge (20) comprises an external outer surface (37) facing the internal outer surface
(34) of the first lateral edge (19);
- fusing at least the internal outer surface (34) and the external outer surface (37) with one another for longitudinally sealing the seam portion of the tube (3) ; wherein the step of fusing comprises at least the following sub-steps:
- directly heating the external outer surface (37) of the second lateral edge (20); and
- heating by contact the internal outer surface (34) by establishing contact between the internal outer surface (34) and the directly heated external outer surface ( 37 ) .
2.- Method according to claim 1, wherein prior to the step of heating by contact, the temperature of the internal outer surface (34) is lower than the temperature of the external outer surface (37) .
3.- Method according to claim 1 or 2, wherein prior to the step of heating by contact, the temperature of the internal outer surface (34) is substantially equal to the ambient temperature.
4.- Method according to any one of the preceding claims, wherein the web (4, 4') of packaging material comprises a plurality of layers;
wherein the external outer surface (34) and the internal outer surface (37) comprises a heat-seal plastic material.
5.- Method according to any one of the preceding claims, wherein the web (4, 4') of packaging material comprises an initial web (5) of packaging material and a sealing strip (11) applied onto the initial web (5) of packaging material;
the method further comprises the step of applying the sealing strip (11) onto the initial web (5) of packaging material such that the second lateral edge (20) comprises the sealing strip (11) .
6.- Method according to claim 5, wherein at least a portion of the sealing strip (11) defines at least a portion of the external outer surface (37) .
7.- Method according to claim 5 or 6, wherein the step of applying the sealing strip (11), is executed prior to the step of overlapping and prior to the step of sealing.
8.- Method according to any one of claims 5 to 7, wherein during the step of applying the sealing strip (11), the sealing strip (11) is applied onto at least an internal surface of the initial web (5) of packaging material, the internal surface of the initial web (5) of packaging material facing the inner space (33) of the tube (3) after formation of the tube (3) .
9. Method according to any one of claims 5 to 8, wherein during the step of applying the sealing strip (11), at least another portion of the sealing strip (11) is applied onto an external surface of the initial web (5) of packaging material, opposite to the internal surface; wherein the external surface of the initial web (5) of packaging material faces the internal outer surface (34) after the formation of the tube (3) .
10.- The method according to any one of claims 5 to 9, wherein during the step of sealing at least a portion of the sealing strip (11) is directly heated.
11.- Method according to any one of the preceding claims, wherein during the step of sealing, a heating unit (39) directly heats the external outer surface (37) of the second lateral edge (20) .
12.- Method according to claim 11, wherein the heating unit (39) directly heats by a flow of a heated gas and/or, by a ray of laser light and/or, by a plasma and/or by electron-beam irradiation.
13.- A method for producing sealed packages (2) of a pourable product comprising the steps according to any one of the preceding claims for forming a tube (3) and further comprising the steps of:
- filling the tube (3) with the pourable product; and
- forming and transversally sealing the formed tube
(3) for producing the sealed packages (2) .
14.- Packaging machine (1) for producing sealed packages (2) of a pourable product from a web (4, 4') of packaging material advancing along a web advancement path (P) , the packaging machine (1) comprises:
- a conveying device (16) for advancing the web (4) of packaging material along the web advancement path (P) at least to a tube forming station (17) at which the web (4) of packaging material is formed, in use, into a tube (3) ;
- a tube forming device (18) configured to form the tube (3) at the tube forming station (17) by overlapping a first lateral edge (19) of the web (4) of packaging material with a second lateral edge (20) of the web (4) of packaging material for obtaining a longitudinal seam portion of the tube (3) ; wherein the second lateral edge (20) is arranged within an inner space (33) of the tube (3) after formation of the tube (3) ; wherein the first lateral edge (19) comprises an internal outer surface (34) facing the inner space (33) and the second lateral edge (20) comprises an external outer surface (37) facing the internal outer surface (34);
- a sealing device (21) configured to longitudinal seal the seam portion by fusing the internal outer surface (34) and the external outer surface (37) with one another;
wherein the sealing device (21) comprises a heating device (39) configured to directly heat the external outer surface (37) of the second lateral edge (20) without heating the internal outer surface (34) of the first lateral edge (19) .
15.- The packaging machine according to claim 14, wherein the heating unit (39) is configured to directly heat the external outer surface (37) by a flow of a heated gas, and/or by a ray of laser light, and/or by a plasma and/or by electron-beam irradiation.
PCT/EP2019/073595 2018-09-10 2019-09-04 A method for forming a tube and a method and a packaging machine for forming a package Ceased WO2020053049A1 (en)

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JP2021513343A JP2022500316A (en) 2018-09-10 2019-09-04 Methods for forming tubes and methods for forming packages and packaging machines
CN201980057504.8A CN112672875B (en) 2018-09-10 2019-09-04 Method for forming a tube, and method and packaging machine for forming a package
BR112021002694-0A BR112021002694B1 (en) 2018-09-10 2019-09-04 METHODS FOR FORMING A TUBE FROM A CONTINUOUS SHEET AND FOR PRODUCING SEALED PACKAGING, AND, PACKAGING MACHINE FOR PRODUCING SEALED PACKAGING
US17/250,839 US11548238B2 (en) 2018-09-10 2019-09-04 Method for forming a tube and a method and a packaging machine for forming a package

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