WO2006073341A1 - Stratifie d'emballage fin et receptacle d'emballage obtenu a partir de celui-ci - Google Patents

Stratifie d'emballage fin et receptacle d'emballage obtenu a partir de celui-ci Download PDF

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Publication number
WO2006073341A1
WO2006073341A1 PCT/SE2005/001933 SE2005001933W WO2006073341A1 WO 2006073341 A1 WO2006073341 A1 WO 2006073341A1 SE 2005001933 W SE2005001933 W SE 2005001933W WO 2006073341 A1 WO2006073341 A1 WO 2006073341A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
packaging
laminate
packaging laminate
laminate according
Prior art date
Application number
PCT/SE2005/001933
Other languages
English (en)
Inventor
Eva Ehrenberg
Thorbjörn Andersson
Katarina Jonasson
Max Hallin-Holmgren
Michael Annerfeldt
Original Assignee
Tetra Laval Holdings & Finance S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Publication of WO2006073341A1 publication Critical patent/WO2006073341A1/fr

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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B32B2264/108—Carbon, e.g. graphite particles
    • 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
    • B32B2274/00—Thermoplastic elastomer material
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/41—Opaque
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/71—Resistive to light or to UV
    • 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
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • 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 thin and heat-sealable paper-based packaging laminate for a packaging container for a liquid food product.
  • the invention is especially directed on such a laminate that is cost-effective yet sufficiently strong and durable, and that can be formed and sealed into a packaging container of a simple and flexible shape.
  • it should have sufficient barriers for food products, such as a light-barrier for light- sensitive food products, and an outer appearance that is acceptable from a customer and consumer point of view.
  • the laminate is especially well adapted for containers for ultra high temperature (UHT) treated food products or aseptic food packaging containers.
  • UHT ultra high temperature
  • Such containers can be of aseptic type and/or of the type intended for ultra high temperature (UHT) treated food products or others. They must also be sufficiently cost-effective for their intended market, and hence the packaging laminate of which they are formed should be beneficially thin and cost-effective. It does not have to be able to be formed into a self-supporting shape with dimension and grip stability, but may simply be formed into a simple and flexible shape, such as a pillow-shape e.g. However, one thing that it must have is an adequate light-barrier, to prevent a light-sensitive food product in the container from being spoiled and/or exhibiting off-flavour.
  • UHT ultra high temperature
  • having a white pigment in the outermost heat-sealable layer means that a printed design must be positioned on top of that plastic layer, whereby advanced or more environmentally unfriendly printing methods have to be used. Also, a protective lacquer needs to be applied on top of the printed design to protect it from scratches and wear during handling. Moreover, if there are flaws in the print, the entire laminate has to be discarded which means unnecessary waste of material.
  • the present invention has for its object to provide a thin and heat-sealable paper-based packaging laminate for a packaging container for a liquid or flowing food product, such as a milk product, which laminate is sufficiently thin and thereby cost-effective, to be competitive, yet having adequately good properties in terms of hygiene, sealability, strength, light-barrier and appearance of a packaging container formed from the laminate. Also, it should be beneficial from a converting point of view, avoiding or at least diminishing the problems in that connection, mentioned above.
  • thermoplastic material an outer heat-sealable layer consisting of a thermoplastic material
  • a thin paper layer - a laminate layer consisting of a thermoplastic material having a white pigment included therein,
  • an inner heat-sealable layer consisting of a thermoplastic material having a dark pigment included therein.
  • the invention also relates to a packaging container formed from such a laminate.
  • a dark pigment preferably a black pigment such as carbon black
  • a white pigment such as titanium dioxide (TiO 2 )
  • the laminate and the container formed thereof achieves an acceptably white appearance despite the inner dark pigmented layer.
  • thermoplastic laminate layer with white pigment included therein is directly bonded to the paper layer, i.e. without any intermediate layers.
  • a special advantage of including the white pigment solely in the laminate layer, and in no other layers, is that a printed design can be positioned directly on the paper layer, where it is protected but not concealed by the fully transparent outer heat-sealable thermoplastic layer. Also, less costly and more environmentally friendly printing techniques can be used when printing directly on the paper layer, such as flexography with water-based ink. Moreover, there will be less depositing of white pigment on process equipment than would be the case if the white pigment was included in the outer heat-sealable layer, and even if the converting line is temporarily shifted to produce a second laminate remaining white pigment will not be a problem since it will be positioned in a more central layer of the laminate, beneath the paper layer, were it is less visible than in an outer layer.
  • said outer heat-sealable layer consists of an extruded polyethylene material with a density of 880-970 kg/m 3 , preferably 910-930 kg/m 3 . It may have a weight of 8-25 g/m 2 , preferably 10-20 g/m 2 , and even more preferred 10-15 g/m 2 . It may be composed of several preferably co-extruded part-layers, whereof at least the outermost is heat-sealable.
  • said thin paper layer consists of bleached kraft paper having a weight of 30-80 g/m 2 , preferably 40-70 g/m 2 , and even more preferred 40-60 g/m 2 . It has a basis weight and strength sufficient, together with the other layers, to give an adequate laminate strength. Most preferred, a paper layer of about 50 g/m 2 is used, which gives a number of advantages over an even thinner paper layer.
  • said thermoplastic of the laminate layer is a polyethylene material with a density of 880-970 kg/m 3 , preferably 910-930 kg/m 3 . It may have a weight of 8-50 g/m 2 , preferably 10-40 g/m 2 , and even more preferred 15-30 g/m 2 .
  • the white pigment is included in this layer at a content of at least 2 %, preferably at least 5 %, and even more preferred at least 8 %, but 20 %, preferably 15 %, and even more preferred 12 % at the most, by weight.
  • said white pigment is titanium dioxide, although other types of white pigment are conceivable.
  • the layer Since it is difficult to include larger contents of the white pigment in the thermoplastic laminate layer, the layer must be made thicker, at the upper end of the above given ranges, if there is a need of a large total amount of white pigment to conceal the dark pigment in the inner heat-sealable layer.
  • the laminate layer may be composed of several preferably co-extruded part-layers, in which case the white pigment may be included in one or more, or all, of these part-layers.
  • the inner heat-sealable layer suitably consists of a thermoplastic material in the group that consists of a polyethylene material, preferably with a density of 880- 970 kg/m 3 , preferably 910-930 kg/m 3 , a polypropylene, an ethylene vinyl acetate and a thermoplastic acrylic acid co-polymer (neutralised or non-neutralised). It may be composed of several preferably co-extruded part-layers, whereof at least the innermost is heat-sealable.
  • the term "innermost” refers to the layer that is outermost on the inside of the laminate, i.e. the layer that will be in contact with the contents of the packaging container formed there from.
  • the inner heat-sealable layer may have a total thickness, depending on thermoplastic quality, of 10-45 g/m 2 , preferably 13-35 g/m 2 , and even more preferred 20-30 g/m 2 . It suitably includes a content of dark pigment of 0.2-2 g/m 2 , preferably 0.2-1 g/m 2 , and even more preferred 0.3-0.8 g/m 2 . However, since the dark pigment is not very expensive, and since it is quite easily included in the thermoplastic material, it is conceivable that it may be included at even larger contents, such as up to 3 or 4 g/m 2 . Suitably, said dark pigment is carbon black.
  • the dark pigment may be included in one or more, or all, of these part-layers.
  • the inner heat-sealable layer is pre-manufactured prior to its incorporation in the packaging laminate, i.e. it constitutes a pre-manufactured film, suitably made by (co-)extrusion blowing, (co-)extrusion casting or (co-)extrusion coating.
  • a blown or cast film has the advantage over an extruded layer that it has better strength and less oxidative degradated materials, because it is made at a lower temperature, and that it has a more controlled machine and cross directional properties.
  • Advantages of using a pre-manufactured film as the inner heat-sealable layer, and using a pre-manufactured paper layer as a bulk layer in the thin laminate according to the invention are that it is easy to change film and/or paper quality, e.g. food contact layer grade, in the converting line, if needed, and that there are somewhat less demands on the accuracy of the extrusion thickness of the extruded layers (the outer heat-sealable layer and the laminate layer).
  • the packaging laminate has a total weight of 60-180 g/m , preferably 70-150 g/m , and even more preferred 75-125 g/m .
  • the invention also relates to a packaging container with a liquid or flowing food content, which container is formed of such a packaging laminate. It may for example have the shape of a flexible pillow with one longitudinal seal and two transversal seals at opposing ends of the container.
  • FIG. 1 is showing a cross-section of a laminate according to the invention
  • Fig. 2 shows a packaging container, formed from the laminate in Fig. 1.
  • the preferred laminate according to the invention is generally denoted 10. It is composed of four layers 12, 13, 14 and 15.
  • the paper layer 12 is made of bleached kraft paper and has a weight of about 50 g/m 2 .
  • the extruded outer heat- sealable thermoplastic layer 13 will constitute the outside of a packaging container formed from the laminate 10 and is made of low density polyethylene (LDPE), and has a weight of about 12 g/m 2 .
  • the inner heat-sealable thermoplastic layer 14 will be in contact with the food in the packaging container formed from the laminate 10. It is a film of extrusion blown linear low density polyethylene (LLDPE), and has a weight of 23 g/m .
  • LLDPE low density polyethylene
  • Fig. 2 shows a packaging container 20, made by a form-fill-seal process of the laminate shown in Fig. 1. It is of flexible pillow-shape, with one longitudinal seal 22 and two transversal seals 24a, 24b at opposing ends of the container.

Abstract

L'invention porte sur un stratifié d'emballage fin (10) destiné à un réceptacle d'emballage (20) de produit alimentaire liquide, ce stratifié présentant une structure de couches ordonnées, disposées de l'extérieur à l'intérieur du stratifié: une couche thermoscellable externe (t13) comprenant un matériau thermoplastique, une couche de papier mince (12), une couche stratifiée (15) comprenant un matériau thermoplastique incluant un pigment blanc et une couche thermoscellable interne (14) comprenant un matériau thermoplastique incluant un pigment noir. L'invention porte également sur un réceptacle d'emballage (20) permettant de contenir une denrée alimentaire liquide ou fluide, ce réceptacle étant constitué du stratifié d'emballage (10).
PCT/SE2005/001933 2005-01-03 2005-12-16 Stratifie d'emballage fin et receptacle d'emballage obtenu a partir de celui-ci WO2006073341A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0500010A SE0500010D0 (sv) 2005-01-03 2005-01-03 A thin packaging laminate and a packaging container formed thereof
SE0500010-4 2005-01-03

Publications (1)

Publication Number Publication Date
WO2006073341A1 true WO2006073341A1 (fr) 2006-07-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/001933 WO2006073341A1 (fr) 2005-01-03 2005-12-16 Stratifie d'emballage fin et receptacle d'emballage obtenu a partir de celui-ci

Country Status (2)

Country Link
SE (1) SE0500010D0 (fr)
WO (1) WO2006073341A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101595044A (zh) * 2007-01-29 2009-12-02 利乐拉瓦尔集团及财务有限公司 包装层压板及其制造方法
CN101205001B (zh) * 2006-12-15 2013-05-01 利乐拉瓦尔集团及财务有限公司 包装层压材料及其制造方法以及包装容器
WO2016166777A1 (fr) * 2015-04-17 2016-10-20 Fiorini Packaging S.P.A. Sac résistant à l'eau

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030390A1 (fr) * 1997-01-10 1998-07-16 Elopak Systems Ag Stratifie d'emballage
WO2001076976A1 (fr) * 2000-04-10 2001-10-18 Stora Enso Oyj Materiau d'emballage thermoscellable multicouche, emballage pour aliments fabrique au moyen de celui-ci et procede d'emballage
WO2004007195A1 (fr) * 2002-07-11 2004-01-22 Stora Enso Oyj Materiau d'emballage thermoscellable et emballage pour produit ferme fabrique a partir dudit materiau
EP1431206A1 (fr) * 2001-09-27 2004-06-23 Tetra Laval Holdings & Finance S.A. Materiau d'emballage en papier destine a un aliment liquide et procede de fabrication associe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030390A1 (fr) * 1997-01-10 1998-07-16 Elopak Systems Ag Stratifie d'emballage
WO2001076976A1 (fr) * 2000-04-10 2001-10-18 Stora Enso Oyj Materiau d'emballage thermoscellable multicouche, emballage pour aliments fabrique au moyen de celui-ci et procede d'emballage
EP1431206A1 (fr) * 2001-09-27 2004-06-23 Tetra Laval Holdings & Finance S.A. Materiau d'emballage en papier destine a un aliment liquide et procede de fabrication associe
WO2004007195A1 (fr) * 2002-07-11 2004-01-22 Stora Enso Oyj Materiau d'emballage thermoscellable et emballage pour produit ferme fabrique a partir dudit materiau

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101205001B (zh) * 2006-12-15 2013-05-01 利乐拉瓦尔集团及财务有限公司 包装层压材料及其制造方法以及包装容器
CN101595044A (zh) * 2007-01-29 2009-12-02 利乐拉瓦尔集团及财务有限公司 包装层压板及其制造方法
CN101595044B (zh) * 2007-01-29 2012-11-14 利乐拉瓦尔集团及财务有限公司 包装层压板及其制造方法
WO2016166777A1 (fr) * 2015-04-17 2016-10-20 Fiorini Packaging S.P.A. Sac résistant à l'eau

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