DK164494B - Heat-sealable multilayer film and its use for packaging of foodstuffs - Google Patents
Heat-sealable multilayer film and its use for packaging of foodstuffs Download PDFInfo
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- DK164494B DK164494B DK585186A DK585186A DK164494B DK 164494 B DK164494 B DK 164494B DK 585186 A DK585186 A DK 585186A DK 585186 A DK585186 A DK 585186A DK 164494 B DK164494 B DK 164494B
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- acrylic acid
- multilayer film
- ethylene
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
- B32B2307/514—Oriented
- B32B2307/516—Oriented mono-axially
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- 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
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- 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
- B32B2307/75—Printability
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- 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
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
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- 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
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- 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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Landscapes
- Laminated Bodies (AREA)
Description
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Den foreliggende opfindelse angår en varmeforseglelig flerlagsfolie, som især egner sig som emballagefolie, da den udviser en tilstrækkelig forseglingsstyrke ved relativt lave forseglingstemperaturer, samt dens anvendelse til em-5 ballering af levnedsmidler.The present invention relates to a heat-sealable multilayer film which is particularly suitable as a packaging film as it exhibits a sufficient sealing strength at relatively low sealing temperatures, as well as its use for food packaging.
Det er kendt, at flerlagsfolier på basis af en polypropylenfolie og forseglingslag af polymere, såsom ionomerharpikser (f.eks. "Surlyn"), forsegles med en tilstrækkelig styrke ved relativt lave temperaturer. Dette 10 gælder også for flerlagsfolier, som udviser forseglingslag af ethylen/vinylacetat-copolymerisater.It is known that multilayer films based on a polypropylene film and sealing layers of polymers such as ionomer resins (e.g. "Surlyn") are sealed with a sufficient strength at relatively low temperatures. This also applies to multilayer foils which exhibit sealing layers of ethylene / vinyl acetate copolymers.
Begge kendte flerlagsfolier har imidlertid den ulempe, at de efter en elektrisk forbehandling, som er nødvendig for betrykningen af folierne, ikke mere for-15 segles med tilstrækkelig styrke. Selv når kun ét forseglingslag af en f lerlagsf olie, der kan forsegles på begge sider, forbehandles elektrisk, kan den således forbehandlede flerlagsfolie ikke mere anvendes til et stort antal omslagsindpakninger, nemlig de indpakninger, hvor der skal 20 ske en forsegling af en forbehandlet folieoverflade mod en folieoverflade, der er forbehandlet eller ikke forbehandlet.However, both known multilayer foils have the disadvantage that, after an electrical pretreatment necessary for the coating of the foils, they are no longer sealed with sufficient strength. Even when only one sealing layer of a multi-layer oil which can be sealed on both sides is electrically pre-treated, the thus-pre-treated multilayer foil can no longer be used for a large number of wrapping wrappers, namely the wrappers where a pre-treated foil surface sealing is to be done. against a foil surface that is pre-treated or not pre-treated.
Det er nu ved tilvejebringelsen af f lerlagsf olien ifølge opfindelsen med asymmetrisk opbygning overraskende 25 lykkedes at ophæve disse ulemper og tilvejebringe en flerlagsfolie, der er forseglelig og kan betrykkes problemløst.By providing the multi-layer film of the invention with asymmetric structure, it has now surprisingly succeeded in overcoming these disadvantages and providing a multilayer film which is sealable and can be printed without problems.
Den foreliggende opfindelse angår således en varmeforseglelig, i det mindste monoaksialt orienteret, eventuelt betrykkelig flerlagsfolie af en folie af en propylenpolymer 30 som basislag og to udvendige forseglingslag, hvilken flerlagsfolie er ejendommelig ved, at 1) det ene forseglinglag (1) består af en ionomerharpiks af et copolymerisat af mere end 80 mol-% ethyl en og mindre end 20 mol-% acrylsyre og eventuelt acrylsyrederivater, der er 35 mindst 30% neutraliseret med zinkioner, eller en ethylen/vi-nylacetat-copolymer med et vinylacetatindhold på 2-10 vægt-% 2The present invention thus relates to a heat-sealable, at least monoaxially oriented, optionally pliable multilayer film of a film of a propylene polymer 30 as a base layer and two outer sealing layers, characterized in that 1) the one sealing layer (1) consists of an ionomer resin of a copolymer of more than 80 mole% ethyl one and less than 20 mole% acrylic acid and optionally acrylic acid derivatives that are at least 30% neutralized with zinc ions, or an ethylene / vinyl acetate copolymer having a vinyl acetate content of 2-10 wt% 2
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og 2) det andet, eventuelt betrykkelige forseglingslag (2) består af et copolymerisat af ethylen/acrylsyre med 1-20% acrylsyre og eventuelt acrylsyrederivater.and 2) the second optionally compressible sealing layer (2) consists of a copolymer of ethylene / acrylic acid with 1-20% acrylic acid and optionally acrylic acid derivatives.
5 Opfindelsen angår også en fremgangsmåde til emballe ring af levnedsmidler med en folie, hvilken fremgangsmåde er ejendommelig ved, at der anvendes i det mindste én folie ifølge opfindelsen.The invention also relates to a method of packaging foodstuffs with a foil, the method being characterized in that at least one foil according to the invention is used.
Ved en asymmetrisk opbygning forstås, at den kemiske 10 sammensætning af de to udvendige forseglingslag er forskellig. På grund af denne asymmetriske opbygning giver den her omhandlede flerlagsfolie også forseglingssømme med tilstrækkelig forseglingsstyrke ved relativt lave temperaturer, når den er betrykt på en af sine overflader.By an asymmetric structure it is understood that the chemical composition of the two outer sealing layers is different. Because of this asymmetric structure, the present multi-layer film also provides sealing seams with sufficient sealing strength at relatively low temperatures when printed on one of its surfaces.
15 Basislaget af den her pmhandlede forseglelige fler lagsfolie består i det væsentlige af en propylenpolymer, som indeholder højst 10 vægtprocent af en yderligere e-olefin med højst 8 carbonatomer, fortrinsvis ethylen.The base layer of the presently sealable multi-layer film consists essentially of a propylene polymer containing not more than 10% by weight of an additional e-olefin having a maximum of 8 carbon atoms, preferably ethylene.
Der anvendes fortrinsvis et isotaktisk polypro-20 py len med en vægtfylde på 0,9-0,91 g/cm og et smelteindeks på 1-4 g/10 min. ved 230°C/21,6 N (ifølge DIN 53735). Dette basislag kan indeholde 3-15 vægtprocent, fortrinsvis 8-12 vægtprocent, af et additiv, som er uforeneligt med propylenpolymeren, fortrinsvis et 25 uorganisk additiv, såsom calciumcarbonat, siliciumdioxid, natriumaluminiumsilicat og/eller titandioxid, hvorved der opnås en opalisering af folien.An isotactic polypropylene having a density of 0.9-0.91 g / cm and a melt index of 1-4 g / 10 min is preferably used. at 230 ° C / 21.6 N (according to DIN 53735). This base layer may contain 3-15% by weight, preferably 8-12% by weight, of an additive which is incompatible with the propylene polymer, preferably an inorganic additive such as calcium carbonate, silica, sodium aluminum silicate and / or titanium dioxide, thereby obtaining an opalization of the film.
Copolymerisatet af mere end 80 molprocent ethylen og mindre end 20 molprocent acrylsyre og eventuelt acrylsyre-30 derivater, der for mindst 30%'s vedkommende er neutraliseret med zinkioner er f.eks. "Surlyn 1705" fra Du Pont.The copolymer of more than 80 mole percent ethylene and less than 20 mole percent acrylic acid and optionally acrylic acid derivatives, which for at least 30% is neutralized with zinc ions, is e.g. "Surlyn 1705" from Du Pont.
Som forseglingslagmateriale til forseglingslaget (1) kan der også anvendes ethylen-vinylacetat-copolymerisa-ter, hvis vinylacetatindhold er 2-10 vægtprocent, fortrinsvis 35 6-9 vægtprocent, og hvis smelteindeks fortrinsvis ligger i området 0,5-3 g/10 min. ved 190eC/21,6 N (DIN 53735), især 3Also used as sealing layer material for the sealing layer (1) is ethylene-vinyl acetate copolymer, whose vinyl acetate content is 2-10% by weight, preferably 35-9% by weight, and whose melt index is preferably in the range of 0.5-3 g / 10 minutes. . at 190 ° C / 21.6 N (DIN 53735), especially 3
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i området 1-2 g/10 min.in the range 1-2 g / 10 min.
Til fremstilling af forseglingslaget (2), der også kan forbehandles elektrisk uden at tabe forseglingsstyrke, anvendes copolymerisater af ethylen/acrylsyre 5 og eventuelt acrylsyrederivater, såsom acrylonitril eller acrylsyreestere af lavere aliphatiske alkoholer .To prepare the sealing layer (2) which can also be electrically pre-treated without losing sealing strength, copolymers of ethylene / acrylic acid 5 and optionally acrylic acid derivatives such as acrylonitrile or acrylic acid esters of lower aliphatic alcohols are used.
Copolymerisaterne i dette forseglingslag er ikke eller i det væsentlige ikke ionomerharpikser. Carboxylgrupperne er altså ikke eller i det væsentlige ikke neutraliserede.The copolymers of this sealing layer are not or essentially not ionomer resins. Thus, the carboxyl groups are not or substantially not neutralized.
10 Copolymerisaterne indeholder 1-20 vægtprocent acryl- syre og eventuelt acrylsyrederivater, især 3-10 vægtprocent acrylsyre og eventuelt acrylsyrederivater. Der anvendes særlig foretrukket copolymerisater med 6-9 vægtprocent acrylsyre. Smelteindekset af forseglingslagmaterialerne bør ligge 15 i området 1-20, fortrinsvis 3rl5, især 5-10 g/10 min. ved 190*C/21,6 N, målt ifølge DIN 53735.The copolymers contain 1-20 wt.% Acrylic acid and optionally acrylic acid derivatives, especially 3-10 wt.% Acrylic acid and optionally acrylic acid derivatives. Particularly preferred copolymers with 6-9% by weight acrylic acid are used. The melt index of the seal layer materials should be in the range 1-20, preferably 3r15, especially 5-10 g / 10 minutes. at 190 ° C / 21.6 N, measured according to DIN 53735.
Den her omhandlede flerlagsfolie kan foruden basislaget og de ydre forseglingslag også indeholde yderligere lag, såsom et gasbarrierelag og eventuelt ved-20 hæftningsformidlende lag. Til fremstilling af gasbarri-erelaget kan der anvendes kendte polymerisater, fortrinsvis ethylen/vinylacetat-copolymerisater, der består af 40-85 molprocent, fortrinsvis 60-75 molprocent vinyl-acetatenheder, der for mindst 90%'s vedkommende, for-25 trinsvis for mere end 95 molprocents vedkommende, er forsæbede . Grænseviskositetstallene [^ ] af polymerene, målt i en opløsningsmiddelblanding af 85 vægtprocent toluen og 15 vægtprocent vand, bør fortrinsvis ligge mellem 0,07 og 0,17 liter/g, især mellem 0,09 og 0,15 liter/g.In addition to the base layer and the outer sealing layers, the multi-layered film may also contain additional layers, such as a gas barrier layer and optionally adhesion-mediating layer. For the preparation of the gas barrier layer, known polymerisates, preferably ethylene / vinyl acetate copolymers consisting of 40-85 mole percent, preferably 60-75 mole percent vinyl acetate units, for at least 90%, preferably for more than 95 mole percent are saponified. The intrinsic viscosity numbers [3] of the polymers, measured in a solvent mixture of 85% by weight of toluene and 15% by weight of water, should preferably be between 0.07 and 0.17 liters / g, especially between 0.09 and 0.15 liters / g.
30 Til fremstilling af gasbarrierelaget, især et oxygen- og/eller aromabarrierelag, kan der ikke blot anvendes de angivne ethylen/vinylalkohol-copolymere, men også andre polymere med gasbarriereegenskaber, f.eks. polyvinylalkohol eller polyamider. Særlig egnede er blan-35 dinger af ethylen/vinylalkohol-copolymere, som ovenfor beskrevet, og 10-60 vægtprocent af de nævnte polymere.For the preparation of the gas barrier layer, in particular an oxygen and / or aroma barrier layer, not only can the indicated ethylene / vinyl alcohol copolymers be used, but also other polymers having gas barrier properties, e.g. polyvinyl alcohol or polyamides. Particularly suitable are mixtures of ethylene / vinyl alcohol copolymers, as described above, and 10-60% by weight of said polymers.
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Egnede som polyamider er især polyamid-6, -12.Suitable as polyamides are especially polyamide-6, -12.
Egnede blandinger er også blandinger/ der beskrives i EP 0.064.330 A 1 og EP 0.063.006 A 1, hvor der til fremstilling af gasbarrierelagene anvendes blandinger 5 af ethylen/vinylalkohol-copolymere og polyamider/ der desuden indeholder egnede blødgørere.Suitable mixtures are also mixtures / disclosed in EP 0.064,330 A1 and EP 0.063.006 A1, where mixtures 5 of ethylene / vinyl alcohol copolymers and polyamides / which contain suitable plasticizers are used to prepare the gas barrier layers.
Hvis den her omhandlede flerlagsfolie indeholder gasbarrierelag/ opnås der som regel kun en tilstrækkelig vedhæftning ved medvirken af vedhæftningsformidlende 1° lag. Til fremstilling af sådanne vedhæftningsformidlende lag anvendes der fortrinsvis modificerede polyolefiner.If the multilayer film in question contains gas barrier layers /, only sufficient adhesion is usually obtained by the aid of 1 ° adhesive mediating agent. Preferably, modified polyolefins are used to prepare such adhesion-mediating layers.
Disse er især homo- eller copolyolefiner med carboxyl-grupper, f.eks. polypropylen eller polyethylen, som tilpodet indeholder mindst en monomer valgt blandt α,β-mo-15 noumættede dicarboxylsyrer, f.eks. maleinsyre, fumarsyre/ itaconsyre eller deres syreanhydrider/ syreestere/ syreamider eller syreimider. Egnede er endvidere copolymeri-sater af ethylen med α,β-umættede carboxylsyrer/ såsom acrylsyre, methacrylsyre og/eller deres metalsalte 20 (zink, natrium) og/eller deres alkyl-(C^-C^)-estere eller tilsvarende podepolymere af de nævnte monomere til polyolefiner, såsom polyethylen eller polypropylen, eller delvis forsæbede ethylen/vinylacetat-copolymerisater, der eventuelt er podepolymeriseret med en monomer af de 25 ovennævnte syrer og udviser en lav forsæbningsgrad, eller blandinger deraf.These are especially homo- or copolyolefins with carboxyl groups, e.g. polypropylene or polyethylene which inoculated contains at least one monomer selected from α, β-monosaturated dicarboxylic acids, e.g. maleic acid, fumaric acid / itaconic acid or their acid anhydrides / acid esters / acid amides or acid imides. Also suitable are copolymerates of ethylene with α, β-unsaturated carboxylic acids / such as acrylic acid, methacrylic acid and / or their metal salts (zinc, sodium) and / or their alkyl (C C-CC) esters or corresponding graft polymers of said monomers for polyolefins such as polyethylene or polypropylene, or partially saponified ethylene / vinyl acetate copolymers optionally grafted with a monomer of the above-mentioned acids and exhibiting a low degree of saponification or mixtures thereof.
Til fremstilling af vedhæftningsformidlende lag foretrækkes især polyolefiner, såsom polypropylen eller copolymerisater af propylen og ethylen med maksimalt 30 1 vægtprocent tilpodede α,β-monoumættede dicarboxylsyre- anhydrider, såsom maleinsvreanhydrid eller forsæbede copolymerisater deraf, eventuelt i blanding med polyolefiner.For the preparation of adhesive-mediating layers, polyolefins such as polypropylene or copolymers of propylene and ethylene with a maximum of 30% by weight of grafted α, β-monounsaturated dicarboxylic anhydrides, such as maleic anhydride or saponified copolymers thereof, are particularly preferred.
De vedhæftningsformidlende polymere kan også ind-35 arbejdes i det forseglelige lag eller i gasbarrierelaget.The adhesion-mediating polymers can also be incorporated into the sealable layer or the gas barrier layer.
En behandling af lagene af den her omhandlede flerlags-A treatment of the layers of the multilayer
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folie med gængse additiver og hjælpemidler, f.eks. gli-demidler, antiblokeringsmidler og antistatika i gængse mængder er mulig.foil with common additives and adjuvants, e.g. lubricants, anti-blocking agents and antistatics in conventional quantities are possible.
• Der kan således anvendes polydiorganisiloxaner 5 eller blandinger deraf, der har en kinematisk viskositet ved 25°C på mindst 100 min /sek. Egnede polydiorganosil-oxaner er polydialkylsiloxaner, polyalkylvinylsiloxan-er, olefinmodificerede siloxanolier, polyethermodifice-rede siloxanolier og olefin/polyether-modificerede si-10 liconeolier, ethoxymodificerede siliconeolier og alkoholmodificerede siliconeolier samt polydialkylsiloxaner med fortrinsvis 1-4 carbonatomer i alkylgruppen.Thus, polydiorganisiloxanes 5 or mixtures thereof having a kinematic viscosity at 25 ° C of at least 100 min / sec can be used. Suitable polydiorganosiloxanes are polydialkylsiloxanes, polyalkylvinylsiloxanes, olefin-modified siloxanes, polyether-modified siloxanes and olefin / polyether-modified silicone oils, ethoxymodified silicone oils and alcohol-modified silicone oils and alcohol-modified silicone oils and alcohol-modified silicone oils
Polydimethylsiloxan er særlig egnet. Polydiorgano- siloxanerne skal fortrinsvis have en kinematisk visko- 5 2 o 6 15 sitet på mindst 10° mm/sek. ved 25PC, især mindst 10° 2 mm/sek. Endvidere kan der anvendes kendte umættede fedtsyreamider, mættede fedtsyreamider, f.eks. stearinsyre-amid, erucasyreamid, og desuden termoplastiske polymere, der er uforenelige med polymerene i lagmaterialerne, f.eks.Polydimethylsiloxane is particularly suitable. The polydiorganosiloxanes should preferably have a kinematic viscosity of at least 10 ° mm / sec. at 25PC, especially at least 10 ° 2 mm / sec. Furthermore, known unsaturated fatty acid amides, saturated fatty acid amides, e.g. stearic acid amide, erucic amide, and additionally thermoplastic polymers incompatible with the polymers in the coating materials, e.g.
20 polyamid-12 eller uorganiske "afstandsholdere", såsom siliciumdioxid eller calciumcarbonat og/eller antistatiske forbindelser, såsom langkædede aliphatiske tertiære aminer, som eventuelt kan være monoumættede, såsom ethoxylerede tertiære aminer, især N,N-bis-(hydroxyethyl)-(C12“ci6^“ 25 -alkylamid til behandling af lagene.20 polyamide-12 or inorganic "spacers" such as silica or calcium carbonate and / or antistatic compounds such as long chain aliphatic tertiary amines which may be optionally monounsaturated such as ethoxylated tertiary amines, especially N, N-bis- (hydroxyethyl) - (C12 "C6-6" alkylamide for treating the layers.
Den her omhandlede flerlagsfolie kan fremstilles ved gængse fremgangsmåder, såsom laminering, belægning og/eller smelte-(co)-ekstrudering.The present multilayer film may be prepared by conventional methods such as lamination, coating and / or melt (co) extrusion.
Den her omhandlede flerlagsfolie er i det mindste 30 monoaksialt orienteret, men er fortrinsvis underkastet en biaksial strækning. Derved foretages strækningen i længderetningen fortrinsvis i forholdet 5:1 til 7:1 og strækningen i tværretningen i forholdet 7:1 til 10:1.The multilayer film of this invention is at least 30 monoaxially oriented, but is preferably subjected to a biaxial stretch. Thus, the longitudinal stretching is preferably in the ratio 5: 1 to 7: 1 and the stretching in the transverse direction in the ratio 7: 1 to 10: 1.
Den her omhandlede flerlagsfolie har fortrinsvis 35 en samlet tykkelse på lO-lOO^um, især 20-50^um, idet basislaget bør have en tykkelse på 20-50yUm, og de varm-The multilayer film of the present invention preferably has a total thickness of 10 to 100 µm, especially 20 to 50 µm, the base layer having a thickness of 20-50 µm and
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forseglelige lag fortrinsvis bør have en tykkelse på 0,8-2^,um, især l,2-l,5yum.preferably sealable layers should have a thickness of 0.8-2 µm, especially 1.2-2.5 µm.
Den her omhandlede flerlagsfolie egner sig især som emballagemateriale, især som omslagsfolier, fortrins-5 vis til levnedsmidler, og kan til dette formål betrykkes og forsynes med oprivningsbaner.The multilayer film of the present invention is particularly suitable as packaging material, especially as wrapping film, preferably for foodstuffs, and can be printed and provided with tearing webs for this purpose.
I de efterfølgende eksempler anvendes følgende prøvningsmetoder til bestemmelse af værdierne.In the following examples, the following test methods are used to determine the values.
Uklarheden måles ifølge ASTM D 1003-52.The haze is measured according to ASTM D 1003-52.
10 Til bestemmelse af foliens glans benyttes en foto elektrisk glansmåler ifølge Dr. B. Lange, Berlin, bestående af en lavvolt-glødelampe og en kondensor, der belyser prøven under en vinkel på 45°, og et andet ben, der har en vinkel med måleplanet på 45°, med en hulblænde og 15 en fotocelle. Der er tilsluttet et finregulerbart registreringsapparat (mikroamperemeter), som desuden indeholder strømforsyningen og spændingskonstantholderen for glødelampen. Glansen er defineret som den lysandel i procent, der reflekteres regulært under en vinkel på 45°, henført 20 til et overfladeforsølvet spejl som 100%'s standard. Ved bestemmelsen af glansen anvendes der på glansmåleren en poleret sort glasplade som mellemstandard, fordi sølvspejl--standarden ikke er bestandig, idet den anløber på grund af luftforurening. Den sorte glasplade har nøjagtig 5% 25 af glansen af en overfladeforsølvet spejlglasplade.10 To determine the film's gloss, a photo electric gloss meter according to Dr. B. Lange, Berlin, consisting of a low-voltage incandescent lamp and a condenser illuminating the sample at an angle of 45 °, and a second leg having an angle of 45 °, with a aperture and a photocell. A fine-tunable recorder (micro-ammeter) is connected, which also contains the power supply and the incandescent lamp holder for the incandescent lamp. The gloss is defined as the percentage of light reflected regularly at an angle of 45 °, assigned 20 to a surface silvered mirror as 100% standard. In determining the gloss, a polished black glass plate is used as the intermediate standard on the gloss meter, because the silver mirror standard is not durable, as it impedes due to air pollution. The black glass plate has exactly 5% 25 of the luster of a surface silvered mirror glass plate.
Galvanometervisningen af glansmålerens fotocelle indstilles via sortglas-mellemstandarden med reguleringspotentiometeret til forøgelse af skalainddelingens aflæsningsnøj agtighed . Folien, som skal undersøges, anbringes 30 på tværs af løberetningen, henført til glansmålerens optiske akse, over matsort fotopapir og plant under glansmåleren og måles på 5 upåklagelige steder. Galvanometervisningen deles med 10, og middelværdien bestemmes.The galvanometer display of the gloss meter photocell is set via the black-glass intermediate standard with the regulation potentiometer to increase the read accuracy of the scale division. The foil to be examined is placed 30 across the direction of travel, assigned to the optical axis of the gloss meter, over matte black photo paper and leveled under the gloss meter and measured at 5 impeccable locations. The galvanometer display is divided by 10 and the mean is determined.
Til bestemmelse af styrken af forseglingssømme 35 undersøges forseglingsstyrken ved et forseglingstryk på 50 N/cm . Derved forstås der ved forseglingsstyrken den 7To determine the strength of sealing seams 35, the sealing strength is examined at a sealing pressure of 50 N / cm. This means the sealing strength of 7
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DK 164494 BDK 164494 B
kraft, som er nødvendig for under definerede betingelser · (50 N/cm tryk og en forseglingstid på 0,5 sek.) at adskille den ved de i tabel I angivne temperaturer fremstillede forseglingssøm. Porseglingsstyrken angives i 5 N og refererer til 15 mm brede prøvebaner.force required under defined conditions · (50 N / cm pressure and a sealing time of 0.5 sec) to separate the sealing nails made in Table I. The sealing strength is given in 5 N and refers to 15 mm wide test tracks.
Til bestemmelse af ridsebestandigheden måles uklarheden, som bestemmes under anvendelse af en Ulbricht's kugle. Derved måles uklarheden af en folie før og efter opkradsning. Opkradsningen sker ved hjælp af 40 g støv-10 frit silicumcarbid, som i løbet af et defineret tidsrum udstrøs på en folie, der skråner 45° i forhold til det vandrette plan.To determine the scratch resistance, the cloudiness is measured which is determined using an Ulbricht's bullet. Thereby the haze of a foil is measured before and after scrubbing. The backing is done by using 40 g of dust-free silicon carbide, which is spread over a defined period on a film sloping 45 ° to the horizontal plane.
Eksempel 1 15 På gængs måde anbringes der på en basisfolie af polypropylen med en vægtfylde på 0,905 g/cm3, et smelteindeks på 3,3 g/10 min. ved 230°C/21,6 N og et smelteinterval på 160-166°C på den ene overflade (A) et forseglingslag af et ethylen/acrylsyre-copolymerisat, hvis 20 carboxylgrupper er neutraliseret med zinkioner, og på den anden overflade (B) et ethylen/acrylsyre-copolymeri-sat med 3 molprocent acrylsyre, og det sammensatte materiale strækkes, således at der fås en sammensat folie med en strækning i længderetningen i forholdet 5:1 og 25 en strækning i tværretningen i forholdet 10:1.Example 1 In a conventional manner, a polypropylene base film having a density of 0.905 g / cm 3 is applied, a melt index of 3.3 g / 10 min. at 230 ° C / 21.6 N and a melting range of 160-166 ° C on one surface (A) a sealing layer of an ethylene / acrylic acid copolymer whose 20 carboxyl groups are neutralized with zinc ions and on the other surface (B) ) an ethylene / acrylic acid copolymer set with 3 mole percent acrylic acid, and the composite is stretched to provide a 5: 1 longitudinal composite film with a 10: 1 longitudinal stretch.
Derved har basisfolien en tykkelse på 17,4yum, og forseglingslagene har hver især en tykkelse på · : 1,3^um.Thereby the base foil has a thickness of 17.4 µm and the sealing layers each have a thickness of: 1.3 µm.
Før bestemmelsen af forseglingsstyrken, glansen 30 og ridsebestandigheden forbehandles forseglingslaget, som består af ethylen/acrylsyre-copolymerisat, elektrisk (coronabehandling). Måleresultaterne er anført i tabel I.Prior to determining the sealing strength, gloss 30 and scratch resistance, the sealing layer, which consists of ethylene / acrylic acid copolymer, is electrically pre-treated (corona treatment). The measurement results are listed in Table I.
35 835 8
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Eksempel 2 (sammenligning)Example 2 (Comparison)
Som angivet i eksempel 1 fremstilles der en flerlagsfolie, idet dog begge overfladerne af basisfolien af polypropylen forsynes med et ethylen/acrylsyre-copolymeri-5 sat, hvis carboxylgrupper er neutraliseret med zinkioner. Ligesom i eksempel 1 foretages der igen en elektrisk forbehandling af et forseglingslag.As indicated in Example 1, a multilayer film is prepared, however, both surfaces of the polypropylene base film are provided with an ethylene / acrylic acid copolymer 5 whose carboxyl groups are neutralized with zinc ions. As in Example 1, electrical preprocessing of a sealing layer is again performed.
Måleresultaterne er anført i tabel I.The measurement results are listed in Table I.
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Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853543118 DE3543118A1 (en) | 1985-12-06 | 1985-12-06 | SEALABLE MULTILAYER FILMS |
| DE3543118 | 1985-12-06 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| DK585186D0 DK585186D0 (en) | 1986-12-05 |
| DK585186A DK585186A (en) | 1987-06-07 |
| DK164494B true DK164494B (en) | 1992-07-06 |
| DK164494C DK164494C (en) | 1992-11-23 |
Family
ID=6287774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK585186A DK164494C (en) | 1985-12-06 | 1986-12-05 | Heat-sealable multilayer film and its use for packaging of foodstuffs |
Country Status (22)
| Country | Link |
|---|---|
| EP (1) | EP0224862B1 (en) |
| JP (1) | JPS62134258A (en) |
| KR (1) | KR870005803A (en) |
| AR (1) | AR245647A1 (en) |
| AT (1) | ATE62883T1 (en) |
| AU (1) | AU589470B2 (en) |
| BR (1) | BR8605982A (en) |
| CA (1) | CA1319094C (en) |
| DD (1) | DD252579A5 (en) |
| DE (2) | DE3543118A1 (en) |
| DK (1) | DK164494C (en) |
| EG (1) | EG18385A (en) |
| ES (1) | ES2021577B3 (en) |
| FI (1) | FI88131C (en) |
| HU (1) | HUT49074A (en) |
| MX (1) | MX160571A (en) |
| NO (1) | NO864707L (en) |
| PL (1) | PL151791B1 (en) |
| SU (1) | SU1528338A3 (en) |
| TR (1) | TR23379A (en) |
| YU (1) | YU45380B (en) |
| ZA (1) | ZA869208B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3824286A1 (en) * | 1988-07-16 | 1990-02-08 | Wolff Walsrode Ag | Multilayer film for coating substrate by contacting and applying heat |
| DE3935643A1 (en) * | 1989-10-26 | 1991-05-02 | Wolff Walsrode Ag | HOT-LAYABLE, HIGH-GLOSSY MULTILAYER FILMS |
| NZ237420A (en) * | 1990-03-23 | 1993-11-25 | Grace W R & Co | Thermoplastic multilayer film having a thermosealing layer of ethylene-methacrylic (or acrylic) acid copolymer or a blend thereof |
| DE69226023T2 (en) * | 1991-09-09 | 1998-10-29 | Mobil Oil Corp., Fairfax, Va. | MULTILAYERED CLOUDY FILM STRUCTURES WITH REDUCED SURFACE FRICTION AND METHOD FOR THE PRODUCTION THEREOF |
| BR9207179A (en) † | 1992-12-04 | 1995-12-12 | Niehoff Kg Maschf | Process for the manufacture of a package with stretched wire material apparatus for winding stretched material on a winding coil and winding coil |
| US5419960A (en) * | 1993-04-30 | 1995-05-30 | Mobil Oil Corp. | Coated films with good low temperature sealing properties an hot tack |
| JPH11257263A (en) * | 1998-03-11 | 1999-09-21 | Toshiba Corp | Helical blade type compressor and refrigerating cycle device employing the compressor |
| DE20112691U1 (en) | 2001-07-31 | 2001-12-13 | FOLIEPACK Kunststoffwerk GmbH, 06571 Roßleben | Flat film |
| IT201600118572A1 (en) * | 2016-11-23 | 2018-05-23 | Irplast Spa | MULTILAYER FILM. |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52155687A (en) * | 1976-06-22 | 1977-12-24 | Toray Ind Inc | Modified polypropylene composite film |
| US4147827A (en) * | 1977-11-04 | 1979-04-03 | Mobil Oil Corporation | Coextruded heat sealable laminar thermoplastic films |
| US4333968A (en) * | 1980-01-25 | 1982-06-08 | Mobil Oil Corporation | Thermoplastic packaging films with improved heat-seal characteristics |
| US4522775A (en) * | 1982-03-04 | 1985-06-11 | American Can Company | Apparatus and method for producing multilayered laminates |
| US4629657A (en) * | 1982-12-13 | 1986-12-16 | Enron Chemical Company | Biaxially oriented polypropylene film construction for special lamination |
| CA1336158C (en) * | 1985-09-11 | 1995-07-04 | Edward Norman Biel | Low temperature impact and puncture resistant termoplastic films and bags therefrom |
-
1985
- 1985-12-06 DE DE19853543118 patent/DE3543118A1/en not_active Withdrawn
-
1986
- 1986-11-17 YU YU1959/86A patent/YU45380B/en unknown
- 1986-11-25 AU AU65739/86A patent/AU589470B2/en not_active Ceased
- 1986-11-25 NO NO864707A patent/NO864707L/en unknown
- 1986-11-26 EP EP86116413A patent/EP0224862B1/en not_active Expired - Lifetime
- 1986-11-26 ES ES86116413T patent/ES2021577B3/en not_active Expired - Lifetime
- 1986-11-26 AT AT86116413T patent/ATE62883T1/en active
- 1986-11-26 DE DE8686116413T patent/DE3678908D1/en not_active Expired - Lifetime
- 1986-11-26 MX MX4441A patent/MX160571A/en unknown
- 1986-12-02 JP JP61286123A patent/JPS62134258A/en active Pending
- 1986-12-02 TR TR667/86A patent/TR23379A/en unknown
- 1986-12-03 EG EG750/86A patent/EG18385A/en active
- 1986-12-04 CA CA000524498A patent/CA1319094C/en not_active Expired - Fee Related
- 1986-12-04 FI FI864961A patent/FI88131C/en not_active IP Right Cessation
- 1986-12-05 HU HU865048A patent/HUT49074A/en unknown
- 1986-12-05 DK DK585186A patent/DK164494C/en not_active IP Right Cessation
- 1986-12-05 ZA ZA869208A patent/ZA869208B/en unknown
- 1986-12-05 BR BR8605982A patent/BR8605982A/en unknown
- 1986-12-05 PL PL1986262820A patent/PL151791B1/en unknown
- 1986-12-05 AR AR86306111A patent/AR245647A1/en active
- 1986-12-05 DD DD86297138A patent/DD252579A5/en not_active IP Right Cessation
- 1986-12-05 KR KR860010401A patent/KR870005803A/en not_active Application Discontinuation
- 1986-12-05 SU SU864028615A patent/SU1528338A3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FI864961A (en) | 1987-06-07 |
| DK164494C (en) | 1992-11-23 |
| CA1319094C (en) | 1993-06-15 |
| FI88131B (en) | 1992-12-31 |
| DK585186D0 (en) | 1986-12-05 |
| ES2021577B3 (en) | 1991-11-16 |
| DD252579A5 (en) | 1987-12-23 |
| HUT49074A (en) | 1989-08-28 |
| FI864961A0 (en) | 1986-12-04 |
| YU45380B (en) | 1992-05-28 |
| ZA869208B (en) | 1987-08-26 |
| SU1528338A3 (en) | 1989-12-07 |
| AU6573986A (en) | 1987-06-11 |
| EP0224862A2 (en) | 1987-06-10 |
| NO864707L (en) | 1987-06-09 |
| DE3543118A1 (en) | 1987-06-11 |
| DK585186A (en) | 1987-06-07 |
| YU195986A (en) | 1988-04-30 |
| BR8605982A (en) | 1987-09-15 |
| PL262820A1 (en) | 1988-03-31 |
| EP0224862B1 (en) | 1991-04-24 |
| MX160571A (en) | 1990-03-27 |
| ATE62883T1 (en) | 1991-05-15 |
| JPS62134258A (en) | 1987-06-17 |
| FI88131C (en) | 1993-04-13 |
| AU589470B2 (en) | 1989-10-12 |
| DE3678908D1 (en) | 1991-05-29 |
| EG18385A (en) | 1993-04-30 |
| PL151791B1 (en) | 1990-10-31 |
| TR23379A (en) | 1989-12-28 |
| KR870005803A (en) | 1987-07-07 |
| AR245647A1 (en) | 1994-02-28 |
| EP0224862A3 (en) | 1988-10-19 |
| NO864707D0 (en) | 1986-11-25 |
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Legal Events
| Date | Code | Title | Description |
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| PBP | Patent lapsed |