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EP0902739A1 - Plastic foil with sealing capacity, for sealing packaging - Google Patents

Plastic foil with sealing capacity, for sealing packaging

Info

Publication number
EP0902739A1
EP0902739A1 EP98910681A EP98910681A EP0902739A1 EP 0902739 A1 EP0902739 A1 EP 0902739A1 EP 98910681 A EP98910681 A EP 98910681A EP 98910681 A EP98910681 A EP 98910681A EP 0902739 A1 EP0902739 A1 EP 0902739A1
Authority
EP
European Patent Office
Prior art keywords
styrene
sealing
butadiene
plastic film
carrier material
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.)
Withdrawn
Application number
EP98910681A
Other languages
German (de)
French (fr)
Inventor
Olle Mannertorp
Erich Kreutzer
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.)
Teich AG
Original Assignee
Teich AG
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 Teich AG filed Critical Teich AG
Publication of EP0902739A1 publication Critical patent/EP0902739A1/en
Withdrawn legal-status Critical Current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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • 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
    • B32B2439/00—Containers; Receptacles
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof

Definitions

  • the invention relates to a sealable plastic film for sealing packaging, which is constructed from a plastic carrier material and a sealing layer adhering to the carrier layer, and the advantageous use thereof.
  • the sealing of packaging is essential for both food and pharmaceutical packaging in order to be able to influence the mechanical stability, the control of the water content as well as the influence of the atmosphere and light on the packaged goods.
  • An important aspect, especially for tightly sealing containers for food, is to prevent microbial growth during the storage of the food.
  • lid elements consisting of aluminum as the carrier material and a sealing wax, are used to close plastic containers.
  • a multi-layer laminate is used as the carrier material, for example made of aluminum with plastics such as polyethylene terephthalate (PETP), polypropylene (PP), polyamide (PA) and even paper.
  • PET polyethylene terephthalate
  • PP polypropylene
  • PA polyamide
  • EP-A 590 461 it is therefore proposed to represent both the carrier material and the sealing layer uniformly with regard to their material components. Therefore, both in the carrier material layer and in the sealing layer finally used plastics.
  • the plastics used in the carrier material layer are those based on polystyrene; the plastics used in the sealing layer are copolymers based on methacrylate which are relatively expensive to produce.
  • the multilayer, heat-sealable plastic films disclosed according to EP-A 590461 are now easily recyclable and can also be subjected to mechanical loads, but can only be used to a limited extent, since their chemical structure in the seal layer means that they can only be sealed against polystyrene and polyvinyl chloride cups.
  • the object of the invention is therefore to provide plastic films for sealing packaging, which are easily recyclable and mechanically stable, but at the same time are satisfactorily heat-sealable regardless of the material component in the package used.
  • a sealable plastic film of the type mentioned is proposed, which is characterized in that the plastics of the carrier material in a mixture consisting of polystyrene (PS), at least one polyolefin, a styrene-butadiene-styrene three-block copolymer (SBS) and / or a styrene-butadiene elastomer (SBR).
  • PS polystyrene
  • SBS styrene-butadiene-styrene three-block copolymer
  • SBR styrene-butadiene elastomer
  • the sealable plastic film according to the invention also has the advantage that the proportion of polystyrene is 5-90% by weight, the proportion of polyolefin is 90-5% by weight and the proportion of styrene-butadiene-styrene triblock copolymer and / or styrene-butadiene Elastomer at least 5% by weight, based on 100% plastics in the carrier material.
  • Another advantageous feature of the sealable plastic film is that the polyolefin is present in the carrier material in the form of a polypropylene (PP).
  • the sealable plastic film according to the invention is characterized in that the molecular weight of polystyrene in the carrier material mixture is at least 100,000.
  • the styrene-butadiene-styrene three-block copolymer and / or the styrene-butadiene elastomer are modified by adding polymeric compounds selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET), polybutylene terephthalate ( PBT), polyphenyl ether (PPE), polycarbonate (PC), polyvinyl chloride (PVC).
  • PA polyamide
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PPE polyphenyl ether
  • PC polycarbonate
  • PVC polyvinyl chloride
  • the sealing layer is advantageously a synthetic resin based on ethylene vinyl acetate (EVA), styrene-butadiene-styrene three-block copolymer (SBS), styrene-butadiene elastomer (SBR), an acrylic synthetic resin, a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
  • EVA ethylene vinyl acetate
  • SBS styrene-butadiene-styrene three-block copolymer
  • SBR styrene-butadiene elastomer
  • acrylic synthetic resin a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
  • the total thickness of the sealable plastic film is advantageously in a range from 20 to 200 ⁇ m, the layer thickness of the carrier material layer being 5 to 95% and the thickness of the sealing layer being 95 to 5% of the total thickness.
  • Another advantage of the invention is that the thickness of the carrier material layer is 85-95% and the thickness of the sealing layer is 5-15% of the total thickness of the plastic film.
  • an adhesion promoter layer is advantageously provided between the sealing and carrier material layers.
  • the sealable plastic film according to the invention is advantageously used as a cover element for cups, especially yoghurt cup or used as a sealing film for pharmaceutical packaging, in particular blister packs.
  • polystyrene 70% by weight of polystyrene, 10% by weight of polyolefin, for example polypropylene, and 20% of styrene-butadiene-styrene three-block copolymers are mixed.
  • the polystyrene used has a molecular weight of approximately 200,000. It can be modified, for example, by monomer units based on styrene-butadiene-styrene or styrene-butadiene elastomer. Polypropylene, for example, is used as the second component. These two components would not be miscible per se, so that the styrene-butadiene-styrene used, for example, serves as an intermediary between the two mixture components. As a result, these properties of the mixture, such as, for example, its heat resistance, as well as its rigidity and expansion coefficient, can be influenced for a given further processing of films.
  • the above-mentioned exemplary mixture for the carrier material in granular form is introduced into a main extruder.
  • the components of the carrier material mixture are presented in such a way that an 80 ⁇ m thick carrier material layer is produced after appropriate stretching.
  • the starting material is component for the production of the sealing layer, for example ethylene vinyl acetate.
  • the entry is made in such a way that a 20 ⁇ m thick sealing layer is produced after appropriate stretching.
  • a heat-sealable plastic film according to the invention is therefore produced in a thickness of, for example, 100 ⁇ m in the coextrusion plant.
  • a carrier material layer with a thickness of 80 ⁇ and a sealing layer with a thickness of 20 ⁇ are now optionally produced in separate extrusion processes. Both foils are glued to a composite foil by means of an adhesive, for example from one or two-component reaction systems.
  • Lids are now punched out of the plastic film according to the invention and these are sealed on yoghurt beakers, for example polystyrene beakers, at a sealing temperature of 180 ° C., a sealing pressure of about 1 bar and a sealing time of 0.5 sec.
  • the cups are tightly closed and can still be opened easily.
  • the seal seam strength is accordingly 5 - 20 N.
  • the plastic film according to the invention can be sealed onto pharmaceutical packaging known per se under the aforementioned sealing conditions.
  • the sealed strips can be easily peeled off so that the medication pack can be opened easily.
  • the plastic film according to the invention is therefore suitable both as a cover element for cups such as yoghurt cups and as a sealing film for pharmaceutical packaging such as blister packs.
  • PATENT CLAIMS PATENT CLAIMS
  • Sealable plastic film for sealing packaging constructed from a plastic carrier material and a sealing layer adhering to the carrier material, characterized in that the plastics of the carrier material in a mixture of polystyrene (PS), at least one polyolefin, a styrene Butadiene-styrene three-block copolymer (SBS) and / or a styrene-butadiene elastomer (SBR) are present.
  • PS polystyrene
  • SBS styrene Butadiene-styrene three-block copolymer
  • SBR styrene-butadiene elastomer
  • Sealable plastic film according to claim 1 characterized in that the proportion of polystyrene 5-90% by weight, the proportion of polyolefin 90-5% by weight and the proportion of styrene-butadiene-styrene triblock copolymer and / or styrene-butadiene -Elastomer be at least 5% by weight, based on 100% plastics in the carrier material.
  • Sealable plastic film according to claim 1 or 2 characterized in that the polyolefin is present in the carrier material in the form of a polypropylene (PP).
  • PP polypropylene
  • the molecular weight of polystyrene in the carrier material mixture is at least 100,000.
  • styrene-butadiene-styrene three-block copolymer and / or the styrene-butadiene elastomer modified by adding polymeric compounds selected from the group polyamide (PA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT) , Polyphenylene ether (PPE), polycarbonate (PC), polyvinyl chloride (PVC).
  • PA polyamide
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PPE Polyphenylene ether
  • PC polycarbonate
  • PVC polyvinyl chloride
  • Sealable plastic film according to one of claims 1 to 5, characterized in that the sealing layer Resin based on ethylene vinyl acetate (EVA), styrene-butadiene-styrene three-block copolymer (SBS), styrene-butadiene elastomer (SBR), an acrylate resin, a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
  • EVA ethylene vinyl acetate
  • SBS styrene-butadiene-styrene three-block copolymer
  • SBR styrene-butadiene elastomer
  • an acrylate resin a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
  • Sealable plastic film according to one of claims 1 to 8, characterized in that an adhesion promoter layer between the seal and carrier material layer is provided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The invention relates to a plastic foil with sealing capacity for the impervious sealing of packaging, consisting of a plastic base material and a sealing layer sticking to the base material. The plastics of the base material come from a mixture of polystyrene (PS), at least one polyolefin, one styrene-butadiene-styrene-three-block copolymer (SBS) and/or one styrene-butadiene-elastomer (SBR). The sealing layer can be an artificial resin based on ethylene vinyl acetate (EVA), a styrene-butadiene-styrene-three-block copolymer (SBS), styrene-butadiene-elastomer (SBR), an acrylate-resin, a polyvinylchloride (PVC) and/or a polypropylene copolymer resin. The plastic foil with sealing capacity is suitable for use as a covering element for pots such as yoghurt pots, and as sealing foil for medicament packaging.

Description

Sieσelfähiσe Kunststoffolie zum Verschließen von Verpackungen S ieσelfähiσe plastic film for closing packaging
Technisches GebietTechnical field
Die Erfindung betrifft eine siegelfähige Kunststoffolie zum dichtenden Verschließen von Verpackungen, welche aus einem Kunststoff-Trägermaterial und einer auf der Trägerschicht haftenden Siegelschicht aufgebaut ist, sowie deren vorteilhafte Verwendung.The invention relates to a sealable plastic film for sealing packaging, which is constructed from a plastic carrier material and a sealing layer adhering to the carrier layer, and the advantageous use thereof.
Stand der TechnikState of the art
Das dichtende Verschließen von Verpackungen ist wesentlich sowohl für Lebensmittel- als auch für Arzneimittelverpackungen, um die mechanische Stabilität, die Kontrolle des Wassergehaltes sowie die Einwirkung der Atmosphäre und des Lichts auf das Packungsgut beeinflussen zu können.The sealing of packaging is essential for both food and pharmaceutical packaging in order to be able to influence the mechanical stability, the control of the water content as well as the influence of the atmosphere and light on the packaged goods.
Ein maßgeblicher Gesichtspunkt insbesondere für das dichte Verschließen von Behältern für Lebensmittel ist, das mikrobielle Wachstum bei der Lagerung der Lebensmittel zu verhindern.An important aspect, especially for tightly sealing containers for food, is to prevent microbial growth during the storage of the food.
Zum Verschließen von Kunststoffgefäßen werden daher in der Lebensmittelindustrie, insbesondere bei Molkereiprodukten wie beispielsweise Joghurt, Deckelelemente, bestehend aus Aluminium als Trägermaterial und einem Siegellack verwendet.In the food industry, in particular in the case of dairy products such as yogurt, for example, lid elements, consisting of aluminum as the carrier material and a sealing wax, are used to close plastic containers.
Vielfach wird anstelle von reinem Aluminium als Trägermaterial auch ein mehrschichtiges Laminat, beispielsweise aus Aluminium mit Kunststoffen wie Polyethylenterephthalat (PETP), Polypropylen (PP), Polyamid (PA) bis hin zum Papier eingesetzt. Dadurch ergibt sich ein hinsichtlich der Stoffkomponenten inhomogener Schichtaufbau des Trägermaterials, was insbesondere bei der Wiederverwertung zu ökologischen Problemen führt.In many cases, instead of pure aluminum, a multi-layer laminate is used as the carrier material, for example made of aluminum with plastics such as polyethylene terephthalate (PETP), polypropylene (PP), polyamide (PA) and even paper. This results in a layer structure of the carrier material which is inhomogeneous with regard to the material components, which leads to ecological problems in particular in the case of recycling.
Gemäß der EP-A 590 461 wird daher vorgeschlagen, sowohl das Trägermaterial als auch die Siegelschicht einheitlich hinsichtlich ihrer Stoffkomponenten darzustellen. Es werden daher sowohl in der Trägermaterialschicht als auch in der Siegelschicht aus- schließlich Kunststoffe eingesetzt. Die in der Trägermaterialschicht eingesetzten Kunststoffe sind solche auf Basis von Polystyrol; die in der Siegelschicht eingesetzten Kunststoffe sind relativ aufwendig herzustellende Copolymerisate auf Methacrylatbasis .According to EP-A 590 461, it is therefore proposed to represent both the carrier material and the sealing layer uniformly with regard to their material components. Therefore, both in the carrier material layer and in the sealing layer finally used plastics. The plastics used in the carrier material layer are those based on polystyrene; the plastics used in the sealing layer are copolymers based on methacrylate which are relatively expensive to produce.
Die gemäß der EP-A 590461 geoffenbarten mehrschichtigen, heiß- siegelfähigen Kunststoffolien sind nun zwar gut recyclierbar und auch mechanisch belastbar, jedoch nur beschränkt anwendbar, da sie aufgrund ihrer chemischen Struktur in der Siegelschicht lediglich gegen Polystyrol- und Polyvinylchloridbecher siegelfähig sind.The multilayer, heat-sealable plastic films disclosed according to EP-A 590461 are now easily recyclable and can also be subjected to mechanical loads, but can only be used to a limited extent, since their chemical structure in the seal layer means that they can only be sealed against polystyrene and polyvinyl chloride cups.
Darstellung der ErfindungPresentation of the invention
Aufgabe der Erfindung ist es daher, Kunststoffolien zum dichtenden Verschließen von Verpackungen anzugeben, welche gut recyclierbar und mechanisch stabil sind, jedoch gleichzeitig unabhängig von der Stoffkomponente in der verwendeten Packung zufriedenstellend heißsiegelfähig sind.The object of the invention is therefore to provide plastic films for sealing packaging, which are easily recyclable and mechanically stable, but at the same time are satisfactorily heat-sealable regardless of the material component in the package used.
Erfindungsgemäß wird daher eine Siegelfähige Kunststoffolie der eingangs genannten Art vorgeschlagen, welche dadurch gekennzeichnet ist, daß die Kunststoffe des Trägermaterials in einer Mischung, bestehend aus Polystyrol (PS), zumindestens einem Polyolefin, einem Styrol-Butadien-Styrol-Dreiblockcopolymer (SBS) und/oder einem Styrol-Butadien-Elastomer (SBR) vorliegen.According to the invention, therefore, a sealable plastic film of the type mentioned is proposed, which is characterized in that the plastics of the carrier material in a mixture consisting of polystyrene (PS), at least one polyolefin, a styrene-butadiene-styrene three-block copolymer (SBS) and / or a styrene-butadiene elastomer (SBR).
Die erfindungsgemäße siegelfähige Kunststoffolie weist ferner den Vorteil auf, daß der Anteil an Polystyrol 5 - 90 Gew.%, der Anteil an Polyolefin 90 - 5 Gew.% und der Anteil an Styrol- Butadien-Styrol-Dreiblockcopolymer und/oder Styrol-Butadien- Elastomer zumindestens 5 Gew.%, bezogen auf 100% Kunststoffe im Trägermaterial, betragen. Ein weiteres vorteilhaftes Merkmal der siegelfähigen Kunststoff- Folie ist, daß das Polyolefin im Trägermaterial in Form eines Polypropylens (PP) vorliegt.The sealable plastic film according to the invention also has the advantage that the proportion of polystyrene is 5-90% by weight, the proportion of polyolefin is 90-5% by weight and the proportion of styrene-butadiene-styrene triblock copolymer and / or styrene-butadiene Elastomer at least 5% by weight, based on 100% plastics in the carrier material. Another advantageous feature of the sealable plastic film is that the polyolefin is present in the carrier material in the form of a polypropylene (PP).
Ferner ist die siegelfähige Kunststoffolie erfindungsgemäß dadurch gekennzeichnet, daß das Molekulargewicht von Polystyrol in der Trägermaterialmischung zumindestens 100.000 beträgt.Furthermore, the sealable plastic film according to the invention is characterized in that the molecular weight of polystyrene in the carrier material mixture is at least 100,000.
Weitere Vorteile der erfindungsgemäßen Kunststoffolie bestehen darin, daß das Styrol-Butadien-Styrol-Dreiblockcopolymer und/ oder das Styrol-Butadien-Elastomer modifiziert durch Zugabe von polymeren Verbindungen, ausgewählt aus der Gruppe Polyamid (PA), Polyethylenterephthalat (PET), Polybutylenterepht alat (PBT), Polyphenylether (PPE), Polycarbonat (PC), Polyvinylchlorid (PVC) ist.Further advantages of the plastic film according to the invention are that the styrene-butadiene-styrene three-block copolymer and / or the styrene-butadiene elastomer are modified by adding polymeric compounds selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET), polybutylene terephthalate ( PBT), polyphenyl ether (PPE), polycarbonate (PC), polyvinyl chloride (PVC).
Vorteilhafterweise ist die Siegelschicht ein Kunstharz auf der Basis von Ethylenvinylacetat (EVA), Styrol-Butadien-Styrol-Drei- blockcopolymer (SBS), Styrol-Butadien-Elastomer (SBR), ein Acry- lat-Kunstharz, ein Polyvinylchlorid (PVC) bzw. ein Polypropylen- copolymer-Kunstharz .The sealing layer is advantageously a synthetic resin based on ethylene vinyl acetate (EVA), styrene-butadiene-styrene three-block copolymer (SBS), styrene-butadiene elastomer (SBR), an acrylic synthetic resin, a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
Dabei liegt die Gesamtdicke der siegelfähigen Kunststoffolie vorteilhafterweise in einem Bereich von 20 - 200 μm, wobei die Schichtdicke der Trägermaterialschicht 5 - 95 % und die Dicke der Siegelschicht 95 - 5 % der Gesamtdicke betragen.The total thickness of the sealable plastic film is advantageously in a range from 20 to 200 μm, the layer thickness of the carrier material layer being 5 to 95% and the thickness of the sealing layer being 95 to 5% of the total thickness.
Ein weiterer Vorteil der Erfindung besteht darin, daß die Dicke der Trägermaterialschicht 85 - 95 % und die Dicke der Siegelschicht 5 - 15% der Gesamtdicke der Kunststoffolie betragen.Another advantage of the invention is that the thickness of the carrier material layer is 85-95% and the thickness of the sealing layer is 5-15% of the total thickness of the plastic film.
Vorteilhafterweise ist bei der erfindungsgemäßen Kunststoffolie eine Haftvermittlerschicht zwischen Siegel- und Trägermaterial- schicht vorgesehen.In the case of the plastic film according to the invention, an adhesion promoter layer is advantageously provided between the sealing and carrier material layers.
Die erfindungsgemäße siegelfähige Kunststoffolie wird vorteilhafterweise als Deckelelement für Becher, insbesondere Joghurt- becher oder als Verschlußfolie für Arzneimittelverpackungen, insbesondere Blisterpackungen verwendet.The sealable plastic film according to the invention is advantageously used as a cover element for cups, especially yoghurt cup or used as a sealing film for pharmaceutical packaging, in particular blister packs.
Ein Weg zur Ausführung der ErfindungOne way of carrying out the invention
Es wird nunmehr ein beispielhafter Weg zur Ausführung der Erfindung angeführt:An exemplary way of carrying out the invention will now be given:
Zur Herstellung der Mischung für das Trägermaterial werden 70 Gew.% Polystyrol, 10 Gew% Polyolefin, beispielsweise Polypropylen sowie 20% Styrol-Butadien-Styrol-Dreiblockcopolymere vermengt .To produce the mixture for the carrier material, 70% by weight of polystyrene, 10% by weight of polyolefin, for example polypropylene, and 20% of styrene-butadiene-styrene three-block copolymers are mixed.
Das eingesetzte Polystyrol weist ein Molekulargewicht von etwa 200.000 auf. Es kann beispielsweise durch Monomerbausteine auf Basis von Styrol-Butadien-Styrol oder Styrol-Butadien-Elastomer modifiziert sein. Als zweite Komponente wird beispielsweise Polypropylen eingesetzt. Diese beiden Komponenten wären an sich nicht mischbar, sodaß das beispielsweise eingesetzte Styrol- Butadien-Styrol als Vermittler zwischen den beiden Mischungskomponenten dient. Dadurch können diese Eigenschaften der Mischung wie beispielsweise deren Hitzebeständigkeit sowie deren Steifheit und Dehnungskoeffizient bei gegebener Weiterverarbeitung von Folien beeinflußt werden.The polystyrene used has a molecular weight of approximately 200,000. It can be modified, for example, by monomer units based on styrene-butadiene-styrene or styrene-butadiene elastomer. Polypropylene, for example, is used as the second component. These two components would not be miscible per se, so that the styrene-butadiene-styrene used, for example, serves as an intermediary between the two mixture components. As a result, these properties of the mixture, such as, for example, its heat resistance, as well as its rigidity and expansion coefficient, can be influenced for a given further processing of films.
Zur Herstellung der erfindungsgemäßen heißsiegelfähigen Kunststoffolie stehen nunmehr folgende Verfahrensvarianten zur Ver- fügung:The following process variants are now available for producing the heat-sealable plastic film according to the invention:
1. Die Herstellung der erfindungsgemäßen Kunststoffolie durch ein Coextrusionsverfahren.1. The production of the plastic film according to the invention by a coextrusion process.
In einem Hauptextruder wird die vorgenannte beispielhafte Mischung für das Trägermaterial in Granulatform eingetragen. Die Komponenten der Trägermaterialmischung werden derart vorgelegt, daß eine 80 μm dicke Trägermaterialschicht nach entsprechender Verstreckung hergestellt wird. Im Coextruder wird die Ausgangs- komponente für die Herstellung der Siegelschicht, beispielsweise Ethylenvinylacetat, eingetragen. Der Eintrag erfolgt derart, daß eine 20 μm dicke Siegelschicht nach entsprechender Verstreckung hergestellt wird.The above-mentioned exemplary mixture for the carrier material in granular form is introduced into a main extruder. The components of the carrier material mixture are presented in such a way that an 80 μm thick carrier material layer is produced after appropriate stretching. The starting material is component for the production of the sealing layer, for example ethylene vinyl acetate. The entry is made in such a way that a 20 μm thick sealing layer is produced after appropriate stretching.
In der Coextrusionsanlage wird daher eine erfindungsgemäße heiß- siegelfähige Kunststoffolie in einer Dicke von beispielsweise 100 μm hergestellt.A heat-sealable plastic film according to the invention is therefore produced in a thickness of, for example, 100 μm in the coextrusion plant.
2. Verfahrensvariante in Form eines Kaschierverfahrens zur Herstellung der erfindungsgemäße Kunststoffolie.2. Process variant in the form of a laminating process for producing the plastic film according to the invention.
Wie unter Beispiel 1 werden nunmehr gegebenenfalls in separaten Extrusionsvorgängen eine Trägermaterialschicht mit einer Dicke von 80μ und eine Siegelschicht mit einer Dicke von 20μ hergestellt. Beide Folien werden mittels eines Klebstoffes, beispielsweise aus ein- oder zweikomponentigen Reaktionssystemen, zu einer Verbundfolie verklebt.As in Example 1, a carrier material layer with a thickness of 80μ and a sealing layer with a thickness of 20μ are now optionally produced in separate extrusion processes. Both foils are glued to a composite foil by means of an adhesive, for example from one or two-component reaction systems.
Aus der erfindungsgemäßen Kunststoffolie werden nunmehr Deckel gestanzt und diese auf Joghurtbecher, beispielsweise Polystyrolbecher, bei einer Siegeltemperatur von 180°C, einem Siegeldruck von etwa 1 bar sowie einer Siegelzeit von 0,5 sec gesiegelt. Die Becher sind gut verschlossen und lassen sich dennoch leicht öffnen. Die Siegelnahtfestigkeit beträgt demgemäß 5 - 20 N.Lids are now punched out of the plastic film according to the invention and these are sealed on yoghurt beakers, for example polystyrene beakers, at a sealing temperature of 180 ° C., a sealing pressure of about 1 bar and a sealing time of 0.5 sec. The cups are tightly closed and can still be opened easily. The seal seam strength is accordingly 5 - 20 N.
Ebenso kann die erfindungsgemäße Kunststoffolie für auf an sich bekannte Arzneimittelverpackungen unter den vorgenannten Siegel- bedingungen aufgesiegelt werden. Auch in diesem Fall lassen sich die gesiegelten Streifen leicht abziehen, sodaß die Arzneimittelpackung einfach geöffnet werden kann.Likewise, the plastic film according to the invention can be sealed onto pharmaceutical packaging known per se under the aforementioned sealing conditions. In this case, too, the sealed strips can be easily peeled off so that the medication pack can be opened easily.
Gewerbliche AnwendbarkeitIndustrial applicability
Die erfindungsgemäße Kunststoffolie eignet sich daher sowohl als Deckelelement für Becher wie Joghurtbecher als auch als Verschlußfolie für Arzneimittelverpackungen wie beispielsweise Blisterpackungen. PATENTANSPRÜCHEThe plastic film according to the invention is therefore suitable both as a cover element for cups such as yoghurt cups and as a sealing film for pharmaceutical packaging such as blister packs. PATENT CLAIMS
1. Siegelfähige Kunststoffolie zum dichtenden Verschließen von Verpackungen, aufgebaut aus einem Kunststoff-Trägermaterial und einer auf dem Trägermaterial haftenden Siegelschicht, dadurch gekennzeichnet, daß die Kunststoffe des Trägermate- rials in einer Mischung aus Polystyrol (PS), zumindestens einem Polyolefin, einem Styrol-Butadien-Styrol-Dreiblockco- polymer (SBS) und/oder einem Styrol-Butadien-Elastomer (SBR) vorliegen.1. Sealable plastic film for sealing packaging, constructed from a plastic carrier material and a sealing layer adhering to the carrier material, characterized in that the plastics of the carrier material in a mixture of polystyrene (PS), at least one polyolefin, a styrene Butadiene-styrene three-block copolymer (SBS) and / or a styrene-butadiene elastomer (SBR) are present.
2. Siegelfähige Kunststoffolie nach Anspruch 1, dadurch gekennzeichnet, daß der Anteil an Polystyrol 5 - 90 Gew.%, der Anteil an Polyolefin 90 - 5 Gew.% und der Anteil an Styrol-Butadien-Styrol-Dreiblockcopolymer und/oder Styrol- Butadien-Elastomer zumindestens 5 Gew.%, bezogen auf 100% Kunststoffe im Trägermaterial, betragen.2. Sealable plastic film according to claim 1, characterized in that the proportion of polystyrene 5-90% by weight, the proportion of polyolefin 90-5% by weight and the proportion of styrene-butadiene-styrene triblock copolymer and / or styrene-butadiene -Elastomer be at least 5% by weight, based on 100% plastics in the carrier material.
3. Siegelfähige Kunststoffolie nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Polyolefin im Trägermaterial in Form eines Polypropylens (PP) vorliegt.3. Sealable plastic film according to claim 1 or 2, characterized in that the polyolefin is present in the carrier material in the form of a polypropylene (PP).
4. Siegelfähige Kunststoffolie nach einem der Ansprüche 1 bis4. Sealable plastic film according to one of claims 1 to
3, dadurch gekennzeichnet, daß das Molekulargewicht von Polystyrol in der Trägermaterialmischung zumindestens 100.000 beträgt.3, characterized in that the molecular weight of polystyrene in the carrier material mixture is at least 100,000.
5. Siegelfähige Kunststoffolie nach einem der Ansprüche 1 bis5. Sealable plastic film according to one of claims 1 to
4, dadurch gekennzeichnet, daß das Styrol-Butadien-Styrol- Dreiblockcopolymer und/oder das Styrol-Butadien-Elastomer modifiziert durch Zugabe von polymeren Verbindungen, ausge- wählt aus der Gruppe Polyamid (PA), Polyethylenterephthalat (PET), Polybutylenterephthalat (PBT), Polyphenylenether (PPE), Polycarbonat (PC), Polyvinylchlorid (PVC) ist.4, characterized in that the styrene-butadiene-styrene three-block copolymer and / or the styrene-butadiene elastomer modified by adding polymeric compounds, selected from the group polyamide (PA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT) , Polyphenylene ether (PPE), polycarbonate (PC), polyvinyl chloride (PVC).
6. Siegelfähige Kunststoffolie nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Siegelschicht ein Kunstharz auf der Basis von Ethylenvinylacetat (EVA), Styrol-Butadien-Styrol-Dreiblockcopolymer (SBS), Styrol- Butadien-Elastomer (SBR), ein Acrylat-Kunstharz, ein Polyvinylchlorid (PVC) bzw. ein Polypropylencopolymer- Kunstharz ist.6. Sealable plastic film according to one of claims 1 to 5, characterized in that the sealing layer Resin based on ethylene vinyl acetate (EVA), styrene-butadiene-styrene three-block copolymer (SBS), styrene-butadiene elastomer (SBR), an acrylate resin, a polyvinyl chloride (PVC) or a polypropylene copolymer resin.
7. Siegelfähige Kunststoffolie nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Gesamtdicke in einem Bereich von 20 - 200 μm liegt, wobei die Schichtdicke der Trägermaterialschicht 5 - 95 % und die Dicke der Siegelschicht 95 - 5 % der Gesamtdicke betragen.7. Sealable plastic film according to one of claims 1 to 6, characterized in that the total thickness is in a range of 20 - 200 microns, the layer thickness of the carrier material layer being 5 - 95% and the thickness of the sealing layer being 95 - 5% of the total thickness.
8. Siegelfähige Kunststoffolie nach Anspruch 7, dadurch gekennzeichnet, daß die Dicke der Trägermaterialschicht 85 - 95 % und die Dicke der Siegelschicht 5 - 15% der Gesamtdicke der Kunststoffolie einnimmt.8. Sealable plastic film according to claim 7, characterized in that the thickness of the carrier material layer occupies 85-95% and the thickness of the sealing layer 5-15% of the total thickness of the plastic film.
9. Siegelfähige Kunststoffolie nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß eine Haftvermittlerschicht zwischen Siegel- und Trägermaterialschicht, vorgesehen ist.9. Sealable plastic film according to one of claims 1 to 8, characterized in that an adhesion promoter layer between the seal and carrier material layer is provided.
10. Verwendung einer siegelfähigen Kunststoffolie nach einem der Ansprüche 1 bis 9 als Deckelelement für Becher, insbesondere Joghurtbecher.10. Use of a sealable plastic film according to one of claims 1 to 9 as a lid element for cups, especially yogurt cups.
11. Verwendung einer siegelfähigen Kunststoffolie nach einem der Ansprüche 1 bis 9 als Verschlußfolie für Arzneimit- telverpackungen, insbesondere Blisterpackungen. 11. Use of a sealable plastic film according to one of claims 1 to 9 as a sealing film for pharmaceutical packaging, in particular blister packs.
EP98910681A 1997-02-18 1998-02-16 Plastic foil with sealing capacity, for sealing packaging Withdrawn EP0902739A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT263/97 1997-02-18
AT26397 1997-02-18
PCT/EP1998/000876 WO1998036902A1 (en) 1997-02-18 1998-02-16 Plastic foil with sealing capacity, for sealing packaging

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FR2831483B1 (en) * 2001-10-26 2004-01-09 Pechiney Emballage Flexible Eu MULTI-LAYER PEELABLE LID OR LID MATERIALS
US6913056B2 (en) 2002-01-31 2005-07-05 Baxter International Inc. Apparatus and method for connecting and disconnecting flexible tubing
DE10236730B4 (en) * 2002-08-09 2004-12-23 Hueck Folien Gmbh & Co. Kg Tear-resistant, recyclable film for container covers
US7275543B2 (en) 2002-09-20 2007-10-02 Baxter International Inc. Coupler member for joining dissimilar materials
GB0225621D0 (en) 2002-11-02 2002-12-11 Glaxo Group Ltd Medicament carrier
JP4483317B2 (en) * 2004-01-30 2010-06-16 東海ゴム工業株式会社 Fuel cell hose
US7722733B2 (en) 2004-03-29 2010-05-25 Baxter International Inc. Method for sterile connection of tubing

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HUP0001017A3 (en) 2000-12-28

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