WO1998052751A1 - Procede de production d'un materiau d'emballage bien integre comprenant des couches d'aluminium et de plastique - Google Patents

Procede de production d'un materiau d'emballage bien integre comprenant des couches d'aluminium et de plastique Download PDF

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Publication number
WO1998052751A1
WO1998052751A1 PCT/SE1998/000933 SE9800933W WO9852751A1 WO 1998052751 A1 WO1998052751 A1 WO 1998052751A1 SE 9800933 W SE9800933 W SE 9800933W WO 9852751 A1 WO9852751 A1 WO 9852751A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
plastic layer
extruded
aluminium
paper web
Prior art date
Application number
PCT/SE1998/000933
Other languages
English (en)
Inventor
Knut Rosenberg
Original Assignee
Tetra Laval Holdings & Finance S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU76806/98A priority Critical patent/AU7680698A/en
Publication of WO1998052751A1 publication Critical patent/WO1998052751A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
    • B32B2041/06—Starting the lamination machine or method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/02—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present invention relates to a method of producing a laminated packaging material comprising layers of plastic and aluminium, in which method an aluminium-clad paper web is coated with a first plastic layer which is extruded on the aluminium- clad side of the paper web, and in which method the thus plastic-coated paper web is coated with a second plastic layer which is extruded on the first plastic layer of the paper web.
  • a laminated packaging material comprising layers of plastic and aluminium is previously known in the art and is often employed for aseptic packages. More precisely, the prior art aseptic packaging material includes a core layer of rigid, but foldable paper and outer, liquid-tight coatings of plastic. Between the core layer and the one of the two outer, liquid-tight plastic coatings, the packaging material has an aluminium foil which serves as oxygen gas barrier and which, by means of a suitable sealing layer, is bonded to the core layer on the one side of the core layer, i.e. that side which is intended to face inwards when the packaging material is reformed into aseptic packages.
  • the above-described prior art packaging material is produced by a lamination/ extrusion process in which a web of paper is clad with an aluminium foil which is permanently bonded to the one side of the web by means of a suitable sealing or adhesive layer which is extruded between the paper web and the aluminium foil.
  • the aluminium-clad paper web is thereafter coated with a first plastic layer which is extruded on the aluminium- clad side of the paper web in connection with the paper web being led through a nip between a first, smaller press roller and a first, larger counter roller which is cooled internally by water at approx. 8-10°C for rapidly solidifying the first extruded plastic layer.
  • the thus plastic-coated paper web is thereafter coated with a second plastic layer which is extruded on the first plastic layer of the paper web in connection with the plastic - coated paper web being led through a nip between a second, smaller press roller and second, larger counter roller which is likewise cooled internally by water at approx. 8-10°C for rapidly solidifying the second plastic layer.
  • One object of the present invention is therefore to realise such a laminated packaging material possessing improved internal cohesion or integrity.
  • the extended contact time between the aluminium foil and the first molten plastic layer which promotes adhesion will be achieved according to the invention by avoiding cooling the first larger counter roller at the application nip for the first plastic layer.
  • the outer peripheral surface of the counter roller was previously kept at a temperature of approx. 25°C by internal cooling with water at approx. 8-10°C, the outer peripheral surface of the counter roller should thus, according to the present invention, be kept at as high a temperature as possible for as long a contact time as possible in order to achieve maximum adhesion between the aluminium foil and the first plastic layer.
  • the outer surface of the first counter roller is thus kept warm by means of heat which is transferred from the extruded first plastic layer.
  • the first plastic layer consists, for example, of polyethylene which has an extrusion temperature of about 300°C, this implies that the outer peripheral surface of the first counter roller is heated to and kept at a corresponding temperature of approx. 300°C.
  • the extruded plastic melt has a tendency to fasten to a surface which is not cooled (in this case the outer peripheral surface of the first counter roller), it is important according to the present invention that the outer counter roller surface is clad by a coating which reduces or eliminates the tendency of the extruded plastic layer to adhere to the surface.
  • a coating which reduces or eliminates the tendency of the extruded plastic layer to adhere to the surface.
  • TEFLON® is TEFLON®.
  • Fig. 1 is a schematic cross section through a conventional laminated packaging material
  • Fig. 2 schematically illustrates a method of producing the laminated packaging material of Fig. 1 according to the present invention.
  • Fig. 1 thus schematically illustrates the make-up of a conventional packaging material for so-called aseptic packages.
  • the laminated packaging material carrying the generic reference numeral 10 comprises a core layer 11 of rigid, but foldable paper of conventional packaging quality for such dimensionally stable packages of the single use disposable type.
  • the packaging material 10 has further two outer, liquid-tight coatings 12 and 13 of plastic, preferably polyethylene, on both sides of the core layer 11.
  • a foil 14 of aluminium which serves as an oxygen gas barrier and which, with good adhesion, is bonded on the one hand to the core layer 11 by the intermediary of an interjacent layer 15 of suitable lamination or adhesive agent, and, on the other hand, to the above- mentioned one outer plastic coating 12 by the intermediary of an interjacent layer 16 of plastic, preferably polyethylene.
  • dimensionally stable aseptic packages are produced using modern packing and filling machines of the type which, from a web or from prefabricated sheet blanks of the packaging material, form, fill and seal finished packages under sterile (aseptic) conditions.
  • aseptic packages are produced in that the sterilized web is, under sterile or aseptic conditions, reformed into a tube by both of the longitudinal edges of the web being united to one another in an overlap joint seal.
  • the tube is filled with sterilized contents, for example liquid foods, and is divided into closed packages by transverse thermoseals of the tube below the level of the contents in the tube.
  • the packages are separated from one another by incisions or cuts in the transverse sealing zones and are given the desired geometric configuration by an additional forming and sealing operation.
  • TETRA BRIK® An extremely well-known aseptic package of the type described above is TETRA BRIK® which is often employed for packing and transporting liquid, sterilized foods with extended shelf life.
  • Fig. 2 illustrates how the packaging material 10 in Fig. 1 may be produced using the method according to the invention.
  • a web 20 of foil-clad 14 paper 11 with an outer coating 13 of plastic for example polyethylene
  • plastic for example polyethylene
  • a web 20 of foil-clad 14 paper 11 with an outer coating 13 of plastic is unwound from a magazine reel (not shown) and is led through a nip at 21 between a first, smaller press roller 22 and a first, larger counter roller 23, at the same time as the foil-clad side 14 of the web 20 is coated with a first layer 16 of plastic, e.g. polyethylene, which is extruded on the foil-clad side of the web by means of an extruder 24 disposed in connection with the nip 21.
  • plastic e.g. polyethylene
  • the first larger counter roller 23 is allowed to be heated by the extruded plastic film 16 so that the outer peripheral surface of the counter roller 23 in contact with the extruded first plastic film 16 is kept at a temperature corresponding to the extrusion temperature of the plastic film 16. If the extruded plastic film 16 consists, for instance, of polyethylene, this implies that the surface of the counter roller 23 is heated to and kept at approx. 300°C.
  • molten plastic film 16 may adhere (so-called sticking) to the surface of the counter roller 23 unless the counter roller is cooled, as in the prior art technique.
  • a cooling of the roller entails that the molten plastic film 16 is instantaneously cooled and hardens on contact with the cooled roller surface, whereby the contact time between the aluminium and the molten plastic is reduced, with consequentially poorer adhesion between the two layers.
  • the plastic coated web is removed from the TEFLON®-clad first counter roller 23 and is led through a second nip at 25 between a second, smaller press roller 26 and a second, larger counter roller 27 at the same time as the still warm first plastic film 16 is coated with a second plastic film 12 which is extruded on the first plastic film 16 by means of an extruder 28 disposed in connection with the second nip 25.
  • the pair of second press roller 26 and second counter roller 27 is substantially identical with the pair of the first press roller 22 and first counter roller 23, apart from the fact that the second counter roller 27 is cooled internally by water at 8-10°C, and, as a result, has a surface temperature of approx. 30°C instead of the approx. 300°C as in the first counter roller 23.
  • the finished web-shaped packaging material 10 is removed from the second counter roller 27 and may thereafter be wound up on a magazine reel for storage prior to its intended final use.
  • Comparative experiments which have been carried out with a packaging material produced by the prior art method using two "cold” roller nips and a packaging material produced by the method according to the present invention with a first "warm” roller nip and a second "cold” roller nip have shown that the latter packaging material - the packaging material according to the present invention - has a dramatically improved adhesion (approx. 200 per cent) between the aluminium foil and the first plastic coating as compared with the conventional packaging material.
  • the present invention attains the previously set out objects and makes for the production of a packaging material comprising layers of aluminium and plastic with surprisingly good adhesion between these layers using but a very simple modification of the prior art technique. While the present invention has been described above with particular reference to polyethylene by way of example of plastic coating, it is not restricted exclusively to this example of usable plastics. The present invention may also be applied on other types of extrudable plastics which occur in packaging contexts, for example SURLYN®.

Landscapes

  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production d'un laminé d'emballage comprenant des couches d'aluminium et de plastique. Selon ce procédé, une bande papier continue enduite d'aluminium est dotée d'une première couche de plastique extrudée sur la face enduite d'aluminium. La bande papier ainsi revêtue de plastique est recouverte d'une seconde couche de plastique qui est extrudée sur la première couche plastique. Pour améliorer l'adhérence entre la première couche plastique extrudée et le revêtement métallique de la bande papier, on augmente le temps de contact entre la première couche plastique extrudée chaude et la feuille métallique de la bande papier, et on applique la seconde couche plastique par extrusion alors que la première couche plastique est encore chaude.
PCT/SE1998/000933 1997-05-22 1998-05-19 Procede de production d'un materiau d'emballage bien integre comprenant des couches d'aluminium et de plastique WO1998052751A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76806/98A AU7680698A (en) 1997-05-22 1998-05-19 A method of producing a well-integrated packaging material comprising layers of aluminium and plastic

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9701909-5 1997-05-22
SE9701909A SE9701909L (sv) 1997-05-22 1997-05-22 Sätt att framställa ett välintegrerat förpackningsmaterial innefattande skikt av aluminium och plast

Publications (1)

Publication Number Publication Date
WO1998052751A1 true WO1998052751A1 (fr) 1998-11-26

Family

ID=20407037

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000933 WO1998052751A1 (fr) 1997-05-22 1998-05-19 Procede de production d'un materiau d'emballage bien integre comprenant des couches d'aluminium et de plastique

Country Status (3)

Country Link
AU (1) AU7680698A (fr)
SE (1) SE9701909L (fr)
WO (1) WO1998052751A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204521A1 (de) * 2002-02-05 2003-08-14 Sig Combibloc Sys Gmbh Verfahren und Vorrichtung zur Verbesserung der Haftung der einzelnen Schichten eines Verbundmaterials

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3575762A (en) * 1969-09-23 1971-04-20 American Can Co Method of laminating an extruded thermoplastic film to a preheated thin metal foil web
EP0217275A2 (fr) * 1985-09-24 1987-04-08 Nippon Petrochemicals Company, Limited Procédé de fabrication de matériau laminé

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3575762A (en) * 1969-09-23 1971-04-20 American Can Co Method of laminating an extruded thermoplastic film to a preheated thin metal foil web
EP0217275A2 (fr) * 1985-09-24 1987-04-08 Nippon Petrochemicals Company, Limited Procédé de fabrication de matériau laminé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204521A1 (de) * 2002-02-05 2003-08-14 Sig Combibloc Sys Gmbh Verfahren und Vorrichtung zur Verbesserung der Haftung der einzelnen Schichten eines Verbundmaterials
DE10204521B4 (de) * 2002-02-05 2006-04-13 Sig Combibloc Systems Gmbh Verfahren und Vorrichtung zur Verbesserung der Haftung der einzelnen Schichten eines Verbundmaterials

Also Published As

Publication number Publication date
SE9701909D0 (sv) 1997-05-22
SE9701909L (sv) 1998-11-23
AU7680698A (en) 1998-12-11

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