EP2076380A1 - Sachet plat constitué d'une feuille multicouche - Google Patents

Sachet plat constitué d'une feuille multicouche

Info

Publication number
EP2076380A1
EP2076380A1 EP07818451A EP07818451A EP2076380A1 EP 2076380 A1 EP2076380 A1 EP 2076380A1 EP 07818451 A EP07818451 A EP 07818451A EP 07818451 A EP07818451 A EP 07818451A EP 2076380 A1 EP2076380 A1 EP 2076380A1
Authority
EP
European Patent Office
Prior art keywords
film
layer
flat bag
met
bag according
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
EP07818451A
Other languages
German (de)
English (en)
Inventor
Markus Bevilacqua
Sven Jacobsen
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.)
3A Composites International AG
Original Assignee
Alcan Technology and Management Ltd
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 Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Priority to EP07818451A priority Critical patent/EP2076380A1/fr
Publication of EP2076380A1 publication Critical patent/EP2076380A1/fr
Ceased legal-status Critical Current

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
    • 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

Definitions

  • the invention relates to a flat bag made of a multilayer film.
  • Flat bags consist of a front wall and a rear wall, which are connected by a circumferential, peripheral sealing seam to tightly sealed bag.
  • Typical multilayer films or laminates for the production of flat bags are usually adhesive-laminated and / or extrusion-laminated, wherein the outer layer usually consists of an oriented plastic film or of paper and serves as a print carrier and / or carrier for a barrier coating, offers a glossy surface and has good thermoresistance.
  • the outer layer usually consists of an oriented plastic film or of paper and serves as a print carrier and / or carrier for a barrier coating, offers a glossy surface and has good thermoresistance.
  • a further oriented or unoriented polymer film or a metallic film as barrier layer carrier or as a layer for improving mechanical properties, such as strength, in the middle.
  • the inner layer usually consists of a non-oriented, for example by blow or cast method produced, mono- or coextruded, heat-sealable film.
  • the individual films are firmly bonded to the laminate with solvent-containing or solvent-free 2-component adhesives, sometimes in several working steps.
  • This process has several disadvantages: Before the bag is made, a residence time is required for curing the adhesive, which binds circulating capital. Furthermore, the Kleberkaschierrata is not safe because of solvent consumption and recovery from an economic and environmental point of view. Another risk factor is, for example, primary aromatic amines, which can migrate into the packaged goods if the adhesive has not completely reacted.
  • a partial solution to this problem is the production process via extrusion lamination or coating.
  • a polymer melt applied between the oriented plastic films of the outer layers or the paper and the metal layer assumes the adhesive function, depending on the requirement, either PE or a PE-based acid, acid anhydride or acrylate based copolymer as Liability provider is used.
  • the sealing layer is partially applied as an extrusion film on the inside of the composite.
  • solvent-based primers which complicate the process from raw materials logistics, are required as a primer.
  • a major disadvantage compared to the adhesive laminating is a significant limitation of the sealing film functionality, as can be achieved, for example, with coextruded cast or blown films. It would therefore be desirable to have a process which produces a composite structure exclusively from the melt in one operation, without having to handle raw materials from the solution.
  • the prepackaging properties are achieved by appropriate combination of the layers in terms of arrangement and thickness, wherein in the area of the oriented films the range of variation, e.g. in terms of available thicknesses and versatility.
  • biaxially oriented PET films having a thickness of less than 12 .mu.m can not be produced sufficiently economically using conventional methods.
  • Biaxially stretched polymer films can be made, inter alia, by blown film extrusion to form two or three bubbles.
  • double bubble (2B) process and “triple bubble (3B) process” are used.
  • the 3-bubble blown film extrusion discussed below is also referred to herein as the 3B process and the 3B process films are also referred to as 3B films.
  • a polymer mass is extruded as a monolayer or multilayer film through a ring die into a thick tube, calibrated to a precise diameter upon exiting the die, and then immediately quenched with water.
  • the tube is heated to a suitably selected stretching temperature and inflated in a further stage to form a second bubble between two pair of withdrawal rollers to expand the bubble diameter again with air or other suitable gas and thereby stretched in the transverse direction or transverse direction.
  • the stretching in the longitudinal direction or machine direction takes place by setting a different rotational speed of the take-off rolls delimiting the bubble in its longitudinal direction.
  • the tube expanded into a bladder is thus conveyed at a higher speed in comparison to the extrusion speed, so that its orientation in the transverse or machine direction is maintained.
  • the film or tube is widened to a third bladder and fixed in the inflated state while maintaining a controlled temperature and a controlled internal bladder pressure.
  • This heat treatment of the third bubble contributes in addition to the reduction of residual stresses, especially in multi-layer films at a flat position, all while maintaining the biaxial orientation achieved by high stability and good mechanical strength.
  • EP 1 410 902 A1, WO 2004/080805 A2, WO 01/03922 A1 and WO 2004/110755 A1 disclose multilayer films produced by the 2B and 3B methods as so-called shrink films for the airtight packaging of food, In the case of the shrinkage process, the film is closely attached to the product to be packaged without the formation of air-containing microcavities. nestles.
  • a tube manufactured continuously in the 2B or 3B method is subdivided into individual tube sections. At the tube sections, one of the two tube openings is first closed by means of a heat seal.
  • the thus formed, unilaterally still open bag is airtight after filling the goods to be packaged over a second Heisshielelung and then shrunk under the action of heat until the bag film completely rests against the contents.
  • the degree of shrinkage of the multilayer films is typically about 20 to 60%.
  • the invention has for its object to provide a flat bag of the type mentioned, in which the multilayer film without the methods of the prior art adhering disadvantages can be produced.
  • a flat bag should be made of a multilayer film having the above properties due to its layer number, order and thickness.
  • the aim is a practically negligible shrinkage.
  • the allowable maximum shrinkage degree of the 3B film is at most 1%.
  • the 3B films of the multilayer films used according to the invention are thermally stabilized or fixed. This ensures that the films are included Further possible processing steps, such as laminating or printing or in a subsequent sterilization process, which sometimes act for a long period of high temperatures on the films, virtually do not shrink.
  • a significant advantage of the 3B films used according to the invention in comparison with conventionally produced films or laminates is that the 3B coextrusion process can be used to produce films having substantially lower thicknesses of the biaxially oriented layers, which leads to substantial material savings.
  • films with a biaxially oriented PET layer having a thickness of, for example, 2 to 12 ⁇ m are possible.
  • PETam Amorphous PET PLA Polylactic acid TPS Starch-based thermoplastic EVOH Ethyl vinyl alcohol (barrier layer) HV Adhesive SBS Styrene-butyl-styrene copolymer SEBS Styrene-ethyl-butyl-styrene copolymer SIS Styrene-isoprene-styrene copolymer AIu Aluminum foil (barrier layer ) V2A stainless steel (barrier layer) with metallization of Alu (barrier layer) SiO x ceramic coating of SiO x (barrier layer) Al 2 O 3 ceramic coating of Al 2 O 3 (barrier layer) i printing ink, printing (ink) L lacquer layer (lacquer) a Adhesive layer w white b black t transparent ma Melt adhesive
  • the 3B film may be coated with at least one further layer, in particular in the curtain coating process or via a slot die coating process (Slot Die Coating).
  • the 3B film film produced by the 3B process is also cut after production, wound on a roll, and can be cut in a further step in-or offline to the required width, processed directly into flat bags.
  • an additional coating, printing and / or another additional process step to achieve technological and appearance properties is also cut after production into a width required for carrying out the further method step, wound on a roll, fed to the method step, and then further processed directly into flat bags.
  • the 3B film or the at least one further layer can in particular be metallized with aluminum or coated with stainless steel or another metal.
  • the 3B film or the at least one further layer can be coated ceramically, in particular with SiO x or with Al 2 O 3 .
  • the 3B film or the at least one further layer can be printed and / or provided with a thermal protective varnish.
  • the 3B film or the at least one further layer can consist of completely biodegradable polymers.
  • the 3B film preferably comprises at least one heat-sealable layer comprising a material selected from the group of polyolefins (PO), polyamides (PA), polyesters and their copolymers, and ionomers (ION). It is also possible to use hot melt adhesives based on EVA and other bases, as well as blends of the abovementioned materials.
  • Typical core layers used are polyamides, polyesters, polyolefins and their copolymers, cycloolefinic polymers, and also the adhesion promoters based on MAH, acrylate and carboxylic acids.
  • barrier layers EVOH, PVOH or aromatic polyamides can be used.
  • Self-adhesive hot-melt adhesive layers made of SBS, SIS, SEBS and an adhesive resin can also be used.
  • the outer layer it is typically possible to use materials from the groups of the polyesters, polyamides, polyolefins and their copolymers, which have sufficient thermoresistance and are suitable for composition and additization for vacuum coating.
  • a 3B film suitable for this field of application may have the layer structure given in Table 1 for the films according to the invention of group 1.
  • a 3B film suitable for this field of application may have the layer structure specified for the films according to the invention of group 2 in Table 1.
  • the 3B process allows a film build from fully biodegradable raw materials.
  • Table 1 compares the prior art laminates or films used for packaging products in flat bags with the laminates or films provided in accordance with the invention. Depending on the type, the moisture content, the shelf life and other product properties, different requirements for the packaging materials arise, which can be divided into the following groups:

Landscapes

  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un sachet plat constitué d'une feuille multicouche. Au moins une partie des couches de cette feuille multicouche se présente sous la forme d'une feuille 3B ayant un degré de rétrécissement maximal de 2 %.
EP07818451A 2006-09-28 2007-09-26 Sachet plat constitué d'une feuille multicouche Ceased EP2076380A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07818451A EP2076380A1 (fr) 2006-09-28 2007-09-26 Sachet plat constitué d'une feuille multicouche

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06405411A EP1905576A1 (fr) 2006-09-28 2006-09-28 Sachet plat en film multicouche
EP07818451A EP2076380A1 (fr) 2006-09-28 2007-09-26 Sachet plat constitué d'une feuille multicouche
PCT/EP2007/008367 WO2008037446A1 (fr) 2006-09-28 2007-09-26 Sachet plat constitué d'une feuille multicouche

Publications (1)

Publication Number Publication Date
EP2076380A1 true EP2076380A1 (fr) 2009-07-08

Family

ID=37737678

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06405411A Withdrawn EP1905576A1 (fr) 2006-09-28 2006-09-28 Sachet plat en film multicouche
EP07818451A Ceased EP2076380A1 (fr) 2006-09-28 2007-09-26 Sachet plat constitué d'une feuille multicouche

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06405411A Withdrawn EP1905576A1 (fr) 2006-09-28 2006-09-28 Sachet plat en film multicouche

Country Status (2)

Country Link
EP (2) EP1905576A1 (fr)
WO (1) WO2008037446A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2233285A1 (fr) * 2009-03-23 2010-09-29 3A Technology & Management AG Film multicouche pour le conditionnement de fromage ferme
DE102009018518A1 (de) * 2009-04-24 2010-10-28 Tesa Se Transparente Barrierelaminate
DE102009003223A1 (de) * 2009-05-19 2010-12-09 Evonik Degussa Gmbh Transparente, witterungsbeständige Barrierefolie für die Einkapselung von Solarzellen III
DE102010038912A1 (de) 2010-08-04 2012-02-09 Huhtamaki Ronsberg Zn Der Huhtamaki Deutschland Gmbh & Co. Kg Bag-on-Valve-System mit einem Füllgut-Behälter für aggressive Füllgüter, Füllgut-Behälter für ein Bag-on-Valve-System, Folienlaminat zur Herstellung eines Füllgut-Behälters und Verwendung des Folienlaminats für ein Bag-on-Valve-System
RU2666436C2 (ru) * 2013-05-16 2018-09-07 Криовак, Инк. Смесь и пленка, проявляющие стойкость к истиранию краски

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI991553A1 (it) * 1999-07-14 2001-01-14 Tecno Coating Engineering A R Film plastico termoretraibile multistrato con caratteristiche barriera
ITMI20022159A1 (it) * 2002-10-11 2004-04-12 Tecno Coating Engineering S R L Pellicola multistrato termoretraibile avente barriera all'ossigeno ed al vapore acqueo, una migliorata resistenza meccanica e buone caratteristiche ottiche e ridotto effetto curling.
US20040173491A1 (en) * 2003-03-07 2004-09-09 Buelow Duane H. Packages made from thermoplastic multilayer barrier structures
ITMI20031203A1 (it) * 2003-06-13 2004-12-14 Tecno Coating Engineering S R L Pellicola multistrato termoretraibile avente barriera all'ossigeno e al vapore acqueo, una migliorata resistenza meccanica e buone caratteristiche ottiche e ridotto effetto curling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008037446A1 *

Also Published As

Publication number Publication date
WO2008037446A1 (fr) 2008-04-03
EP1905576A1 (fr) 2008-04-02

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