EP3271171A1 - Film pour thermoformage - Google Patents

Film pour thermoformage

Info

Publication number
EP3271171A1
EP3271171A1 EP16711140.0A EP16711140A EP3271171A1 EP 3271171 A1 EP3271171 A1 EP 3271171A1 EP 16711140 A EP16711140 A EP 16711140A EP 3271171 A1 EP3271171 A1 EP 3271171A1
Authority
EP
European Patent Office
Prior art keywords
layer
thermoforming
film
layers
sheet 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
EP16711140.0A
Other languages
German (de)
English (en)
Inventor
Timo Ouninkorpi
Mikko Kettunen
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.)
Wihuri Packaging Oy
Original Assignee
Wihuri Packaging Oy
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 Wihuri Packaging Oy filed Critical Wihuri Packaging Oy
Publication of EP3271171A1 publication Critical patent/EP3271171A1/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
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/10—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating materials in packages which are not progressively transported through the apparatus
    • 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
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B65B47/00—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved
    • B65B47/02—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved with means for heating the material prior to forming
    • 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
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02—Sterilising, e.g. of complete packages
    • B65B55/12—Sterilising contents prior to, or during, packaging
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • 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
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/412—Transparent
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/732—Dimensional properties
    • 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
    • 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
    • B32B2439/80—Medical packaging

Definitions

  • thermoforming sheet which has a sealing layer, a gas barrier layer and an outer layer of a polyester, wherein the outer layer has a thickness which corresponds to a maximum of 40% of a total thickness of the thermoforming sheet.
  • a film is known, for example, from JP 3 051 614 B2.
  • Thermoforming films are used today in a variety of different applications. In deep-drawing process, the film is heated and then deformed in the desired manner. The result is a container, preferably a trough, in which, for example, food, pet food, medical supplies, medical products or the like can be packed. After filling, the container or the trough can be closed. For this purpose, for example, a lid film can be used. This is preferably sealed under the action of pressure and temperature with the thermoforming sheet, from which the trough or container consists. The sealing takes place via the sealing layers of the cover and thermoforming film.
  • thermoforming films To improve the shelf life of food a variety of methods are used. For example, foods are thermally treated. Such a treatment is often carried out in the packaging, for example in a closed thermoformed thermoforming film. Known heat treatment processes are, for example, pasteurization and sterilization.
  • the gas barrier layer is used for this.
  • thermoforming film has the best possible transparency, so it is as clear as possible.
  • Deep-drawn foils have proven themselves here, which have an outer layer of polyester.
  • JP 3051614 B2 describes a film with a polyester outer layer.
  • this has the disadvantage that it tends to roll. This means that problems can occur during the production of the film, but also when preparing and processing the film on the packaging machine. For example, it can happen that the resulting packaging rolls up at the corners. On the one hand, this can lead to problems with regard to the tightness of the sealed seams and, on the other hand, is perceived as a visual impairment and hardly or not accepted by the customers.
  • JP 2005/028863 it is proposed in JP 2005/028863 to increase the layer thickness of the polyester layer.
  • layer thicknesses of 40% to 60% of the total thickness of the thermoforming sheet are proposed.
  • a thick selected polyester outer layer leads to an increase in the total thickness of the film.
  • Such thick polyester layers result after deep drawing the thermoforming sheet almost stable containers and troughs.
  • these containers are not thermally stable. They tend to break at low temperatures because of their low impact strength and can soften at higher temperatures.
  • thermoforming films are known whose outer layer consists of a polyamide. These films are much more flexible and temperature-stable. To improve the thermoforming and puncture resistance, it is known to use several connected by a primer polyamide layers. EP 1 098 765 describes such a layer structure. However, it can lead to delamination under certain conditions. In the cited document, therefore, polyolefin layers are interposed between the polyamide layers in order to avoid this delamination.
  • a disadvantage of all thermoforming films whose outer layer consists of a polyamide is the deteriorated Transparency. In addition, a polyamide outer layer can cause the film to shrink when the deep-drawn container is cooled, so that the desired and deep-drawn dimensions can not be maintained.
  • the invention is therefore based on the object to further develop a thermoforming sheet according to the preamble of claim 1, that the further processing obstructing, or even impossible making reeling of the polyester layer and thus the entire thermoforming sheet is prevented.
  • the film should have a high transparency and a high gloss and a good impact resistance.
  • thermoforming film which has a sealing layer, a gas barrier layer and an outer layer made of a polyester, the outer layer having a thickness which corresponds to a maximum of 40% of a total thickness of the thermoforming film, wherein the thermoforming film is characterized in that between the gas barrier layer and the outer layer an intermediate layer of an olefin homo- and / or copolymer is arranged.
  • this additional polyolefin layer leads to the fact that the rolling up of the thin polyester layer is prevented without the transparency and the gloss of the thermoforming film or the deep drawing ability of the thermoforming film being appreciably impaired.
  • the thickness of the outer layer is preferably at most 30%, particularly preferably at most 20%, of the total thickness of the thermoforming film.
  • thermoplastic polymer selected from the group of homo- and copolyesters is selected for the outer layer.
  • homo- and copolyesters are preferably selected from a group comprising amorphous thermoplastic aliphatic, partially aromatic and aromatic homo- and copolyesters.
  • Such homo- and copolyesters are derived from Polyols, preferably of diols, such as ethylene glycol, 2-methyl-1, 3-propanediol or 1, 4-butanediol, and dicarboxylic acids or dicarboxylic acid derivatives, such as adipic acid, isophthalic acid and / or terephthalic acid, from.
  • Homopolyesters are those polyesters derived from a polyol component and a dicarboxylic acid component. Suitable homopolyesters are preferably selected from the group comprising PET and PBT.
  • PET refers to polyethylene terephthalate, which can be made from ethylene glycol and terephthalic acid.
  • PBT is polybutylene terephthalate which can be prepared from butane-1,4-diol and terephthalic acid.
  • the preferably amorphous state is characterized by the prefix "A.”
  • a particularly preferred amorphous homopolyester is APET (amorphous PET).
  • Copolyesters are those polyesters which, in addition to a polyol component and a dicarboxylic acid component, also contain at least one further comonomer.
  • Suitable preferably amorphous copolyesters are copolyesters of an aromatic dicarboxylic acid, such as terephthalic acid, an aliphatic glycol, such as ethylene glycol, and at least one further monomer, preferably at least one further monomer selected from the group comprising preferably branched aliphatic polyols, aromatic polyols and cycloaliphatic polyols or aliphatic and aromatic dicarboxylic acids.
  • a particularly preferred amorphous copolyester is derived from ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol.
  • Another preferred copolyester is derived from ethylene glycol, terephthalic acid and isophthalic acid.
  • the outer layer of thermoforming sheet is based on at least one amorphous homopolyester of an aromatic dicarboxylic acid and an aliphatic polyol or on at least one amorphous copolyester of at least one aromatic dicarboxylic acid, at least one aliphatic and at least one cycloaliphatic polyol or on at least one amorphous copolyester of at least two aromatic dicarboxylic acids and at least one aliphatic polyol.
  • the outer layer of the thermoforming sheet is based on at least an amorphous homopolyester of an aromatic dicarboxylic acid and an aliphatic diol or on at least one amorphous copolyester of at least one aromatic dicarboxylic acid, at least one aliphatic and at least one cycloaliphatic diol, or on at least one amorphous copolyester of at least two aromatic dicarboxylic acids and at least one aliphatic diol.
  • the gas barrier layer consists at least partially of a polyamide (PA).
  • PA polyamide
  • the gas barrier layer can also consist entirely of PA.
  • Suitable polyamides are homo- and / or copolyamides, which are preferably selected from the group comprising thermoplastic aliphatic, partially aromatic and aromatic homo- or copolyamides.
  • These homo- or copolyamides can be selected from aliphatic and / or cycloaliphatic diamines having 2 to 10 carbon atoms, such as hexamethylenediamine and / or aromatic diamines having 6 to 10 carbon atoms, such as p-phenylenediamine, and aliphatic and / or aromatic dicarboxylic acids having 6 to 14 carbon atoms , such as adipic acid, terephthalic acid or isoterephthalic acid.
  • these homo- or copolyamides can be prepared from lactams having 4 to 10 carbon atoms, such as ⁇ -caprolactam.
  • the homo- and / or copolyamides are advantageously selected from the group comprising PA 6, PA 12, PA 66, PA 61, PA 6T, corresponding copolymers and mixtures of at least two of said polymers.
  • the gas barrier layer is formed in multiple layers.
  • the gas barrier layer has at least three layers with two outer layers of a polyamide (PA) and a middle layer of a further material for improving the gas barrier, preferably ethylene-vinyl alcohol copolymer (EVOH).
  • PA polyamide
  • EVOH ethylene-vinyl alcohol copolymer
  • the middle layer is preferably based on at least one thermoplastic polymer selected from the group comprising ethylene-vinyl alcohol copolymers (EVOH), at least partially hydrolyzed polyvinyl acetates, polyvinylidene chloride (PVDC), vinylidene chloride copolymers, preferably with a proportion of vinylidene chloride of at least 80% to the overall weight of the vinylidene chloride copolymer, or of a mixture of at least two of said polymers, more preferably of at least one ethylene-ene-vinyl alcohol copolymer.
  • EVOH ethylene-vinyl alcohol copolymers
  • PVDC polyvinylidene chloride
  • vinylidene chloride copolymers preferably with a proportion of vinylidene chloride of at least 80% to the overall weight of the vinylidene chloride copolymer, or of a mixture of at least two of said polymers, more preferably of at least one ethylene-ene-vinyl alcohol
  • the ethylene-vinyl alcohol copolymers (EVOH) used to form the middle layer are obtained by complete or incomplete hydrolysis of corresponding ethylene-vinyl acetate copolymers (EVAc).
  • EVAc ethylene-vinyl acetate copolymers
  • Fully saponified ethylene-vinyl acetate copolymers having a saponification degree of more than 98% and an ethylene content of 0.01 to 80 mol%, preferably from 1 to 50 mol%, in each case based on the total weight of the ethylene oxide are preferably used.
  • the partially hydrolyzed polyvinyl acetates used to prepare the middle layer are obtained by complete or incomplete hydrolysis of corresponding polyvinyl acetates.
  • At least partially hydrolysed polyvinyl acetates used to produce the middle layer are selected from the group comprising fully hydrolyzed polyvinyl acetates (polyvinyl alcohols, PVOH) having a degree of saponification greater than 98% and partially hydrolyzed polyvinyl acetates having a degree of saponification of from 75% to 98% inclusive.
  • the gas barrier layer is at least partially made of a polyester. It has proven to be particularly advantageous if the gas barrier layer consists entirely of polyester. As a result, on the one hand, a sufficient gas barrier is provided and, on the other hand, the transparency and the gloss of the deep-drawing film are further increased.
  • the polyester can be chosen from the same materials as the outer layer.
  • the gas barrier layer has at least three layers with two outer layers of a polyester and a middle layer of ethylene-vinyl alcohol copolymer (EVOH).
  • the outer layers and the middle layer are joined together using adhesion promoters.
  • adhesion promoters A variety of different adhesion promoters are known in the art which may be used.
  • the outer layers and the middle layer are modified by means of a modifying polyester ether, preferably a maleic anhydride group-modified polyester ether, which are admixed to at least one of the layers to be joined to a proportion of up to 50%.
  • the modified polyester ether is admixed to one or both of the layers to be bonded in each case and thus ensures that adhesion between the individual layers is produced.
  • the sealing layer is preferably composed of a heat-sealable thermoplastic polymer selected from the group comprising olefin homo- and - copolymers and copolymers of at least one olefin and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer and is optionally formed in multiple layers.
  • Olefin homopolymers and copolymers which are suitable for producing the sealing layer are preferably thermoplastic olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having 2,3,4,5,6,7,8,9 or 10 carbon atoms.
  • Suitable olefin homopolymers are preferably selected from the group comprising ethylene homopolymers (polyethylenes, PE), preferably LDPE and HDPE, propylene homopolymers (polypropylenes, PP), butylene homopolymers (polybutylenes, PB) and isobutylene homopolymers (polyisobutylenes, PI ) or mixtures of at least two of said polymers.
  • PE ethylene homopolymers
  • PP propylene homopolymers
  • butylene homopolymers polybutylenes, PB
  • isobutylene homopolymers polyisobutylenes, PI
  • LDPE refers to low density polyethylenes which have a density in the range of 0.86 to 0.93 g / cm 3 and are characterized by a high degree of branching of the molecules.
  • HDPE high density polyethlyenes which have little branching of the molecular chain, the density ranging between 0.94 and 0.97 g / cm 3 .
  • Suitable olefin copolymers are preferably copolymers of ethylene and / or propylene and at least one ⁇ -olefin having at least four, preferably from 4 to 10, more preferably from 4 to 8 carbon atoms, most preferably copolymers of ethylene and / or propylene with at least one ⁇ -olefin selected from the group comprising butene, hexene and octene.
  • the ⁇ -olefin content in the olefin copolymer is preferably at most 25% by weight, more preferably at most 15% by weight, based in each case on the total weight of the olefin copolymer.
  • Particularly suitable copolymers of ethylene and at least one ⁇ -olefin having at least 4 carbon atoms are LLDPE and / or mPE.
  • LLDPE refers to low density linear ethylene copolymers which are characterized by the presence of a linear backbone with side chains attached thereto and have a density in the range of 0.86 to 0.94 g / cm 3 .
  • mPE is meant ethylene copolymers which are polymerized by means of metallocene catalysts and preferably have a density in the range of 0.88 to 0.93 g / cm 3 .
  • the sealing layer it is also possible to use mixtures of olefin copolymers and / or olefin homopolymers, although transparency of the layer must be ensured.
  • the proportion of the olefin copolymer in the mixture is preferably higher than the proportion of the olefin homopolymer.
  • Particularly preferred is a mixture of mPE, LLDPE and / or LDPE.
  • the sealing layer is based on a mPE, an LLDPE, a mixture of 40 to 90 wt .-% mPE and 60 to 10 wt .-% LLDPE, a mixture of 60 to 10 wt .-% mPE and 40 to 90 wt % LLDPE, a mixture of 20 to 50 wt .-% LLDPE and 80 to 50 wt .-% LDPE, a mixture of 20 to 50 wt .-% LDPE and 80 to 50 wt .-% LLDPE, a mixture of 20 to 50 wt .-% LDPE and 80 to 50 wt .-% mPE or a mixture of 20 to 50 wt .-% mPE and 80 to 50 wt .-% LDPE, each based on the total weight of the sealing layer, wherein the sum the percentage by weight must always be 100% by weight.
  • the olefin content in the olefin copolymer of the transparent sealing layer is at least 75%, preferably at least 80%, more preferably at least 85%, based in each case on the total weight of the olefin copolymer.
  • Copolymers of at least one olefin and at least one other ⁇ , ⁇ -unsaturated, non-olefinic monomer suitable for producing the transparent sealing layer are preferably copolymers of at least one olefin selected from the group consisting of ethylene, propylene, butylene and isobutylene, preferably ethylene and / or Propylene, and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer having at least one oxygen-containing group, preferably at least one ester and / or one acid group.
  • Particularly preferred as the co-monomer is at least one ⁇ , ⁇ -unsaturated, non-olefinic monomer selected from the group comprising vinyl acetate, (meth) acrylate and (meth) acrylic acid.
  • (meth) acrylate and (meth) acrylic acid in the context of the present invention include both alkyl methacrylates and methacrylic acid and also alkyl acrylates and acrylic acid.
  • the olefin content in the copolymer of at least one olefin and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer of the sealing layer is at least 60%, preferably at least 65%, more preferably at least 70%, most preferably at least 75% , in each case based on the total weight of the copolymer.
  • the sealing layer is based on at least one thermoplastic polymer selected from the group consisting of olefin homopolymers and copolymers and copolymers of at least one olefin and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer.
  • the sealant layer is based on at least one copolymer of ethylene and / or propylene, preferably ethylene, and at least one ⁇ -olefin having at least 4 carbon atoms, preferably butene, hexene and / or octene, or at least one ethylene copolymer selected from the group comprising ethylene-vinyl acetate copolymers, ethylene-d-4-alkyl (meth) acrylate copolymers and ethylene (meth) acrylic acid copolymers, preferably on at least one ethylene-vinyl acetate copolymer or at least one ethylene-Ci-4-alkyl ( meth) acrylate copolymers.
  • the sealing layer advantageously has a layer thickness of at least 5 ⁇ m, more preferably of more than 8 ⁇ , most preferably from 8 to 100 ⁇ on.
  • the sealing layer may also be formed as a so-called peel layer.
  • a known method of achieving the peel effect is, for example, the addition of polybutylene in polyethylene or ethylenic copolymers. These methods are known to the person skilled in the art.
  • the transparent sealing layer has anti-fogging equipment.
  • the sealing layer preferably contains at least one antifogging additive or the sealing layer has at least one side of a coating based on at least one antifogging additive.
  • Antifog additives are known in the art, preferably at least one additive selected from the group comprising alkoxylated amines, alkoxylated amides and polyol fatty acid esters, preferably glycerol fatty acid esters or sorbitan monoesters, and their corresponding salts used. If the sealing layer is coated on at least one side with at least one antifogging additive, then the sealing layer may optionally be treated with corona (before) before this coating.
  • antiblocking and slip additives known to the person skilled in the art can be used in the sealing layer.
  • the intermediate layer advantageously also consists of a thermoplastic polymer selected from the group comprising olefin homopolymers and copolymers and copolymers of at least one olefin and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer.
  • a thermoplastic polymer selected from the group comprising olefin homopolymers and copolymers and copolymers of at least one olefin and at least one further ⁇ , ⁇ -unsaturated, non-olefinic monomer.
  • the sealing layer is based on at least one copolymer of ethylene and propylene or on a homopolypropylene.
  • the individual layers are preferably connected to one another by an adhesion promoter.
  • an adhesion promoter As a result, the use of adhesives, which can lead to outgassing and under certain conditions also to delaminations avoided.
  • Thermoplastic polymers which are modified with polar groups, preferably with organic acid groups and / or organic acid anhydride groups, particularly preferably with cyclic organic acid anhydride groups, very particularly preferably with maleic anhydride groups, are suitable for the preparation of the adhesion promoter layers.
  • Methods for modifying the thermoplastic polymers which are suitable for the preparation of the adhesion promoter layers are known to the person skilled in the art. Preferably, the modification has been effected by grafting on the thermoplastic polymers.
  • the adhesion promoter layers are preferably based on at least one modified thermoplastic olefin homo- and / or copolymer.
  • the same type of thermoplastic olefin homo- and copolymers can be used, which can also be used for the production of the sealing layer or the intermediate layer.
  • the adhesion promoter layers are particularly preferably based on at least one cyclic inorganic acid anhydride group-modified ethylene or propylene homo- or copolymers, particularly preferably on a maleic anhydride-modified ethylene or propylene homo- or copolymers.
  • the adhesion promoter layers have a layer thickness of at most 10 ⁇ , more preferably at most 5 pm, most preferably of at most 3 pm.
  • the thermoforming film preferably has a total thickness of from 30 ⁇ m to 300 ⁇ m, the layer thickness of the outer layer being between 2 ⁇ m and 120 ⁇ m.
  • thermoforming film itself can be produced by all common production methods, preferably it is produced by an extrusion or coextrusion process. Both blown film extrusion and flat film extrusion can be used.
  • thermoforming sheet is used according to an embodiment of the present invention as a packaging for a food, with concernss- at least a part of the packaging was produced by a thermoforming process from the thermoforming film.
  • the food is pasteurized in the package.
  • Turbidity is the amount of light that leaves a sample of the film to be examined after being illuminated with a central beam at a solid angle of more than 8 ° to a maximum of 160 °. Haze is reported in percent and is based on the total amount of light passing through the sample. The total amount of light thus corresponds to 100 percent.
  • the gloss of the film is the regularly reflected light component, referred to a light beam incident at 20 ° to the solder.
  • the gloss is given in gloss units GE, which are based on a black glass standard with a refractive index of 1.567.
  • Sharpness is the clarity with which an object appears through a foil.
  • the light is deflected within a small solid angle, so that the amount of scattered light is concentrated in a narrow lobe.
  • the image sharpness is measured in an angle range ⁇ 2.5 °.
  • Comparison film according to an embodiment of the present invention is a film having a thickness of the individual layers in microns.
  • HV denotes a bonding agent
  • the adhesion properties were determined.
  • the adhesion of the film to the metallic thermoforming mold must be as low as possible in order to ensure good processing. Therefore, in the present tests, the adhesion properties to aluminum were determined.
  • the layer structure already described above according to an embodiment of the present invention has been used.
  • the standard comparative film used was a layer structure comprising a 200 ⁇ m layer of APET (amorphous polyester) and a 50 ⁇ m layer of polyethylene.
  • Adhesion was measured before and after a deep drawing operation.
  • the so-called seal strength is determined according to DIN 55529.
  • the film was sealed to aluminum before and after the thermoforming. Subsequently, the seal strength was determined, which is the maximum force Newton required to separate a sealed seam produced under defined conditions. These defined conditions include pressure, time and temperature.
  • the deep drawing of the individual films was carried out on a standard packaging machine at a mold temperature of 100 ° C.
  • the drawing depth was 40 mm in a format of 180 x 113 mm.
  • the film was then sealed with the outside at 150 ° C for 0.5 seconds and a pressure of 50 Newton / cm 2 with a sealing device (smooth seal jaws) on an aluminum foil.
  • a sealing device smooth seal jaws
  • the two film strips are attached at their longer, unsealed end in a tensile testing machine so that the strips to be separated form an angle of about 180 °.
  • Over the measuring section of the sealing area the force for separating the two films is determined.
  • the instrument used for the test is a computer-controlled tension testing machine.
  • the force measured in Newton corresponds to the force needed to separate the two test strips to be separated along the 15 mm wide seal.
  • a force of 0.4 N was determined in the known reference film structure in order to separate the 15 mm sealed seam.
  • 0.4 N was also measured before the deep drawing whereas only 0.3 N was necessary after the deep drawing. This means a lower adhesion after deep drawing, so that the polyester processability can be improved by lower polyester thicknesses.
  • the shrinkage properties of the film were determined directly after deep drawing.
  • packs were deep-drawn at 90 ° C. on a standard thermoforming machine.
  • the draw depth was 60 mm with a format of 114 mm x 223 mm.
  • the lengths and widths of the deep-drawn samples were measured directly after the thermoforming and compared with the format sizes. Investigations were made on the already mentioned standard film and the described embodiment of the present invention. While the standard film had 3.3% to 4.9% shrinkage, in the film according to the embodiment of the present invention, 0.4% to 1.8% shrinkage was observed.
  • the Shrink properties have thus been significantly improved by the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film pour thermoformage présentant une couche de scellement, - une couche barrière à gaz et - une couche extérieure en polyester, la couche extérieure ayant une épaisseur correspondant à maximum 40 % d'une épaisseur totale du film pour thermoformage, caractérisé en ce qu'une couche intermédiaire en homopolymère et/ou copolymère à base d'oléfine est intercalée entre la couche barrière à gaz et la couche extérieure.
EP16711140.0A 2015-03-20 2016-03-18 Film pour thermoformage Ceased EP3271171A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015003516.9A DE102015003516A1 (de) 2015-03-20 2015-03-20 Tiefziehfolie
PCT/EP2016/000485 WO2016150562A1 (fr) 2015-03-20 2016-03-18 Film pour thermoformage

Publications (1)

Publication Number Publication Date
EP3271171A1 true EP3271171A1 (fr) 2018-01-24

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Application Number Title Priority Date Filing Date
EP16711140.0A Ceased EP3271171A1 (fr) 2015-03-20 2016-03-18 Film pour thermoformage

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US (1) US20180065343A1 (fr)
EP (1) EP3271171A1 (fr)
CA (1) CA2980025A1 (fr)
DE (1) DE102015003516A1 (fr)
WO (1) WO2016150562A1 (fr)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5300563A (en) * 1990-07-30 1994-04-05 Quantum Chemical Corporation Polyester-based adhesives and composite structures
SE9300558D0 (sv) * 1993-02-19 1993-02-19 Kabi Pharmacia Ab Autoclavable multilayer films
JP2699814B2 (ja) * 1993-08-06 1998-01-19 東洋製罐株式会社 フレーバー保持性に優れたプラスチック多層容器及び米飯包装体
JP3051614B2 (ja) 1993-09-29 2000-06-12 三菱樹脂株式会社 深絞り成形用共押出複合フィルム
DE19718199A1 (de) * 1997-04-30 1998-11-05 Wolff Walsrode Ag Mehrschichtige, gereckte, heißsiegelbare Polypropylenfolie
DE19830976A1 (de) 1998-07-10 2000-01-13 Wolff Walsrode Ag Mehrschichtige, coextrudierte, wärmestabile Tiefziehfolie für Verpackungsanwendungen
US6503549B1 (en) * 1998-09-30 2003-01-07 Cryovac, Inc. Polyester tray package with lidding film having glycol-modified copolyester sealant layer
US6244441B1 (en) * 1999-11-10 2001-06-12 Cryovac, Inc. Heat sealable barrier film for fluid fillable packaging cushions and cushions made therefrom
KR100985092B1 (ko) * 2002-04-15 2010-10-04 미쓰비시 가가꾸 가부시키가이샤 열가소성수지 조성물 및 다층적층체
JP4242749B2 (ja) 2003-06-19 2009-03-25 株式会社クレハ 深絞り成形用共押出積層フィルム
US8815360B2 (en) * 2007-08-28 2014-08-26 Cryovac, Inc. Multilayer film having passive and active oxygen barrier layers
WO2010015402A1 (fr) * 2008-08-07 2010-02-11 Cryovac, Inc. Structures multicouches comprenant une séquence de microcouches
US8236886B2 (en) * 2009-07-30 2012-08-07 Equistar Chemicals, Lp Adhesive compositions
US8524358B2 (en) * 2009-11-04 2013-09-03 Klockner Pentaplast Of America, Inc. Configuration of multiple thermoformable film layers for rigid packaging requiring moisture and oxygen protection
US8883920B2 (en) * 2010-03-10 2014-11-11 The Nippon Synthetic Chemical Industry Co., Ltd. Resin composition and multilayer structural body employing the same
EP2386411A1 (fr) * 2010-05-03 2011-11-16 Cryovac, Inc. Film barrière multicouche pour conditionnement de VSP, procédé de conditionnement et conditionnements correspondants obtenus

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CA2980025A1 (fr) 2016-09-29
US20180065343A1 (en) 2018-03-08
WO2016150562A1 (fr) 2016-09-29
DE102015003516A1 (de) 2016-09-22

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