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EP1465768A2 - Composite material for light-, gas- and liquid-tight heat-sealing packagings - Google Patents

Composite material for light-, gas- and liquid-tight heat-sealing packagings

Info

Publication number
EP1465768A2
EP1465768A2 EP03729479A EP03729479A EP1465768A2 EP 1465768 A2 EP1465768 A2 EP 1465768A2 EP 03729479 A EP03729479 A EP 03729479A EP 03729479 A EP03729479 A EP 03729479A EP 1465768 A2 EP1465768 A2 EP 1465768A2
Authority
EP
European Patent Office
Prior art keywords
layer
composite material
material according
composite
thermoplastic polymer
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Withdrawn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
EP03729479A
Other languages
German (de)
French (fr)
Inventor
Werner Trautwein
Michael Wolters
Johannes Linden
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.)
SIG Combibloc Systems GmbH
Original Assignee
SIG Combibloc Systems GmbH
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 SIG Combibloc Systems GmbH filed Critical SIG Combibloc Systems GmbH
Publication of EP1465768A2 publication Critical patent/EP1465768A2/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Withdrawn legal-status Critical Current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
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/55—Liquid crystals
    • 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
    • B32B2311/00—Metals, their alloys or their compounds
    • 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
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31703—Next to cellulosic

Definitions

  • the invention relates to a composite material made of paper or cardboard as a carrier material with a
  • Plastic coating in particular for light-tight, gas-tight and liquid-tight heat-sealable packs, the plastic coating in each case having outer sealing layers and a barrier layer made of metal being present between the carrier material layer and a sealing layer.
  • Heat-sealable composite materials for the production of packs, in particular beverage packs, are known in a wide variety of designs. Paper or cardboard is usually used as the carrier material; A lamination of different layers ensures the tightness required for the respective application and thus the durability of the filled product.
  • the outer sealing layers consist of a suitable thermoplastic polymer.
  • a composite of cardboard coated with polyethylene is preferably used, a layer of aluminum foil as a gas and aroma barrier on the inside (based on the later pack) being laminated to the cardboard carrier material with the sealing layer.
  • Packaging of this type has become established in practice for containing perishable goods, such as UHT milk and fruit juices in particular. The packaged product has already been sterilized by suitable steps before the aseptic filling.
  • the composite structure existing according to the prior art has only a barrier layer of water and water vapor impermeable material which protects the cardboard.
  • This layer is usually arranged on the product side and protects the carrier material against moisture from the product.
  • the polymer layer on the outside of the carrier material is only used for sealability, printability and as protection against "normal" environmental influences.
  • the object of the invention is to provide a composite material of the type mentioned at the outset and described in more detail above, in which the backing material layer is protected in such a way that a pack made therefrom with the product contained therein can be sterilized in an autoclave or the like , It is also desirable that the composite material can be produced simply and inexpensively. This object is achieved in that a further barrier layer is provided on the other side of the carrier material layer.
  • a package made from the composite material according to the invention can therefore be sterilized without problems in an autoclave even at higher sterilization temperatures.
  • the metal barrier layers applied to both sides of the carton are 'absolute' barrier layers and have the additional advantage that the holes or imperfections occasionally occurring during processing, especially when folding and folding, and during transport etc. a barrier layer, because of the intact second layer in front of or behind it, cannot have a negative impact on the shelf life of the packaged product.
  • the double metal layer thus leads to increased safety of the product quality with respect to e.g. B. Shelf life.
  • at least one connecting layer is arranged between the carrier material layer and the barrier layer.
  • Such a layer also called an adhesion promoter layer, ensures better contact between the carrier material and the barrier layers.
  • a further embodiment of the invention provides that at least one further connection layer is arranged between the barrier layer and the outer sealing layer. This measure also improves the adhesion between the barrier layer and the respective outer sealing layer.
  • the oxygen barrier layer consists of Al foil.
  • a polymer-based or adhesive-based adhesion promoter can be used as the connecting layer.
  • PP thermoplastic polymer
  • PET polyethylene terephthalate
  • PE polyethylene
  • LCP liquid crystalline polymers
  • EVOH ethylene / vinyl alcohol
  • PA polyamide
  • the outer sealing layers have a layer thickness of 10 to 40 g / m 2 .
  • the outer sealing layer relating to the later composite pack preferably has one Layer thickness of 10 to 20 g / m 2 and the inner sealing layer related to the subsequent packaging a layer thickness of 20 to 35 g / m 2 .
  • an aluminum foil with a layer thickness of 5 to 10 ⁇ m, preferably 6 to 8 ⁇ m, is provided as the barrier layer.
  • connection layer (adhesion promoter layer) has a layer thickness of 4 to 20 g / m 2 , preferably 5 to 10 g / m 2 . It is particularly expedient here if the connecting layer between the carrier material layer and the barrier layers is thicker than the connecting layer between the barrier layers and the outer sealing layers.
  • the composite material according to the invention can be produced in a single operation using the coextrusion process.
  • FIG. 1 shows a first embodiment of a composite material according to the invention
  • Fig. 2 shows a second embodiment of a composite material according to the invention
  • Fig. 3 shows another embodiment of a composite material according to the invention.
  • examples of the composite materials according to the invention are shown schematically in cross section and not to scale.
  • barrier layers 2 to protect the cardboard from the flat attack of water during the autoclaving process.
  • the composite is provided with two sealing layers 3, which consist of a thermoplastic polymer, the thermoplastic polymer polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), made of liquid-crystalline polymers (LCP),
  • a thermoplastic polymer the thermoplastic polymer polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), made of liquid-crystalline polymers (LCP),
  • Ethylene / vinyl alcohol (EVOH) or polyamide (PA) can be.
  • the sealing layers 3 enable the composite to be welded and can also be constructed from a plurality of polymer layers or a compound thereof.
  • FIG. 2 shows a further exemplary embodiment of a composite material according to the invention, in which improved composite adhesion is made possible by additional connecting layers 4 between the cardboard layer 1 and the barrier layers 2.
  • the connection layers 4 consist of an adhesion promoter based on polymer or adhesive.
  • FIG. 3 shows a third exemplary embodiment in which two further connecting layers 4 are present between the barrier layers 2 and the sealing layers 3 lying on the outside.

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

A composite material is disclosed, made from paper or cardboard as support material (1) with a plastic coating, in particular for light-, gas- and liquid-tight heat-sealing packagings, whereby the plastic coatings each have external sealing layers (3) and a barrier layer (2) made from metal is arranged between the support material layer (1) and a sealing layer (3). The invention also relates to a method for production thereof. According to the invention, the support material layer (1) is protected in the composite material such that a packaging, made therefrom with the product therein, may be sterilised in an autoclave or similar and said composite material may be simply and economically produced, whereby a further barrier layer (2) is provided on the other side of the support material layer (1).

Description

Verbundmaterial für licht-, gas- und flüssigkeitsdichte, heißsiegelbare Packungen Composite material for light, gas and liquid tight, heat sealable packs
Die Erfindung betrifft ein Verbundmaterial aus Papier oder Karton als Trägermaterial mit einerThe invention relates to a composite material made of paper or cardboard as a carrier material with a
Kunststoffbeschichtung, insbesondere für licht-, gas- und flüssigkeitsdichte heißsiegelbare Packungen, wobei die Kunststoffbeschichtung jeweils äußere Siegelschichten aufweist und zwischen der Trägermaterialschicht und einer Siegelschicht eine Barriereschicht aus Metall vorhanden ist .Plastic coating, in particular for light-tight, gas-tight and liquid-tight heat-sealable packs, the plastic coating in each case having outer sealing layers and a barrier layer made of metal being present between the carrier material layer and a sealing layer.
Heißsiegelbare Verbundmaterialien zur Herstellung von Packungen, insbesondere Getränkepackungen, sind in unterschiedlichsten Ausführungen bekannt. Als Trägermaterial dient hier in der Regel Papier oder Karton; eine Kaschierung aus unterschiedlichen Schichten sorgt für die für den jeweiligen Einsatzzweck benötigte Dichtigkeit und somit für die Haltbarkeit des jeweils abgefüllten Produktes. Die äußeren Siegelschichten bestehen dabei aus einem geeigneten thermoplastischen Polymer.Heat-sealable composite materials for the production of packs, in particular beverage packs, are known in a wide variety of designs. Paper or cardboard is usually used as the carrier material; A lamination of different layers ensures the tightness required for the respective application and thus the durability of the filled product. The outer sealing layers consist of a suitable thermoplastic polymer.
Zahlreiche abzufüllende Produkte, wie beispielsweise Milch oder Saft, behalten unter aseptischen Bedingungen ihre Qualität nur bei, wenn sie auch gegen Licht, Aromen und Sauerstoff ausreichend geschützt sind. Hierfür wird vorzugsweise ein Verbund aus mit Polyethylen beschichtetem Karton eingesetzt, wobei eine Schicht aus Aluminiumfolie als Gas- und Aromabarriere innen (bezogen auf die spätere Packung) mit der Siegelschicht auf das Trägermaterial Karton kaschiert wird. Solche Verpackungen haben sich in der Praxis zur Aufnahme von verderblichen Gütern, wie insbesondere H-Milch und Fruchtsäften durchgesetzt. Das abgepackte Produkt ist dabei bereits vor dem aseptischen Abfüllen durch geeignete Schritte sterilisiert worden.Numerous products to be filled, such as milk or juice, only maintain their quality under aseptic conditions if they are also adequately protected against light, aromas and oxygen. For this purpose, a composite of cardboard coated with polyethylene is preferably used, a layer of aluminum foil as a gas and aroma barrier on the inside (based on the later pack) being laminated to the cardboard carrier material with the sealing layer. Packaging of this type has become established in practice for containing perishable goods, such as UHT milk and fruit juices in particular. The packaged product has already been sterilized by suitable steps before the aseptic filling.
Der nach dem Stand der Technik bestehende Verbundaufbau hat jedoch nur eine den Karton schützende Barriereschicht aus wasser- und wasserdampfundurchlässigem Material. Diese Schicht ist in der Regel produktseitig angeordnet und schützt das Trägermaterial vor Feuchtigkeit aus dem Produkt. Die auf dem Trägermaterial außen liegende Polymerschicht dient nur der Siegelfähigkeit, Bedruckbarkeit und als Schutz vor „normalen" Umwelteinflüssen.The composite structure existing according to the prior art, however, has only a barrier layer of water and water vapor impermeable material which protects the cardboard. This layer is usually arranged on the product side and protects the carrier material against moisture from the product. The polymer layer on the outside of the carrier material is only used for sealability, printability and as protection against "normal" environmental influences.
Aus diesem Grunde ist es nicht möglich, solche Packungen - ähnlich wie Konserven - zunächst abzufüllen und das Produkt durch Erhitzung in einem Autoklaven anschließend zu sterilisieren. Durch die weniger geschützte Seite des Kartonverbundes dringt das Autoklavenwasser (bei innenliegender Barriereschicht) oder das Wasser des Füllgutes (bei außenliegender Barriereschicht) während des Autoklavierprozesses in den Karton ein und beeinträchtigt damit die Festigkeit/Steifigkeit des Verbundes bzw. der Verpackung.For this reason, it is not possible to first fill such packs - similar to canned goods - and then to sterilize the product by heating in an autoclave. Due to the less protected side of the cardboard composite, the autoclave water (with an internal barrier layer) or the water of the filling material (with an external barrier layer) penetrates into the cardboard during the autoclaving process and thus impairs the strength / rigidity of the composite or the packaging.
Zur Minimierung dieses Problems müssen dicke und teure Polymerschichten, Färb- und Lackschichten eingesetzt werden die eine gewisse minimale Wasserbarriere gewährleisten. Es muss ein relativ dicker und chemisch speziell behandelter Karton eingesetzt werden, der entsprechend teuer ist. Trotz des erhöhten Aufwandes ist die Widerstandsfähigkeit solcher Kartonverbunde im Autoklavprozess stark eingeschränkt insbesondere in Bezug auf die zulässige maximale Sterilisationstemperatur. Dies hat zur Folge, dass die Sterilisationszeiten relativ lang sein müssen um eine ausreichende Keimabtötungsrate zu gewährleisten. Lange Autoklavzykluszeiten reduzieren jedoch die Autoklavkapazität und erhöhen die Kosten. Darüber hinaus führen lange Sterilisationszeiten bei vielen zu verpackenden Produkten/Lebensmitteln zu einer geringeren Qualität bzw. geschmacklichen Beeinträchtigung.To minimize this problem, thick and expensive polymer layers, coloring and lacquer layers must be used, which ensure a certain minimal water barrier. A relatively thick and chemically specially treated cardboard must be used, which is correspondingly expensive. Despite the increased effort, the resistance of such cardboard composites in the autoclave process is severely limited, particularly with regard to the permissible maximum sterilization temperature. The consequence of this is that the sterilization times must be relatively long in order to ensure an adequate germ killing rate. However, long autoclave cycle times reduce the autoclave capacity and increase costs. In addition, long sterilization times for many products / foods to be packaged lead to a lower quality or taste impairment.
Die geringere Widerstandsfähigkeit des bekannten Verbundmaterials während des Autoklavierprozesses führt teilweise dazu, dass das Wasserdampf-Gas-Gemisch während des Autoklavierprozesses und insbesondere gegen Ende des Prozesses, in der Konzentrationszusammenstellung hin zu einem "trockenerem" Gemisch hin verschoben wird. Dadurch wird - wegen des schlechteren Wärmetransports - eine weitere unerwünschte Verlängerung des Autoklavierzyklusses erzielt .The lower resistance of the known composite material during the autoclaving process partly leads to the water vapor / gas mixture being shifted towards a "drier" mixture in the concentration composition during the autoclaving process and in particular towards the end of the process. This results in a further undesirable extension of the autoclaving cycle because of the poorer heat transport.
Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Verbundmaterial der eingangs genannten und zuvor näher beschriebenen Art zur Verfügung zu stellen, bei dem die Trägermaterialschicht so geschützt ist, dass eine daraus hergestellte Packung mit in ihr enthaltenem Produkt in einem Autoklaven oder dergleichen sterilisiert werden kann. Weiterhin ist erwünscht, dass das Verbundmaterial einfach und kostengünstig hergestellt werden kann. Diese Aufgabe wird dadurch gelöst, dass auf der anderen Seite der Trägermaterialschicht eine weitere Barriereschicht vorgesehen ist .Proceeding from this, the object of the invention is to provide a composite material of the type mentioned at the outset and described in more detail above, in which the backing material layer is protected in such a way that a pack made therefrom with the product contained therein can be sterilized in an autoclave or the like , It is also desirable that the composite material can be produced simply and inexpensively. This object is achieved in that a further barrier layer is provided on the other side of the carrier material layer.
Die auf den beiden Seiten des Kartons aufgebrachten Barriereschichten aus Metall schützen den Karton wesentlich effektiver und verleihen ihm so eine besonders große mechanische und thermische Widerstandsfähigkeit. Daher lässt sich eine aus dem erfindungsgemäßen Verbundmaterial hergestellte Packung auch bei höheren Sterilisationstemperaturen problemlos in einem Autoklaven sterilisieren.The metal barrier layers on both sides of the cardboard protect the cardboard much more effectively and thus give it a particularly high mechanical and thermal resistance. A package made from the composite material according to the invention can therefore be sterilized without problems in an autoclave even at higher sterilization temperatures.
Dies ermöglicht auch höhere Sterilisationstemperaturen im Autoklaven. Damit ergibt sich eine Verkürzung der Sterilisationszeit, eine Verbesserung des Geschmacks und eine Erhöhung der Qualität des verpackten Produkts. Aufgrund des verbesserten Schutzes des Kartons können dünnere und weniger spezielle Kartonsorten eingesetzt werden.This also enables higher sterilization temperatures in the autoclave. This results in a shortening of the sterilization time, an improvement in taste and an increase in the quality of the packaged product. Due to the improved protection of the cardboard, thinner and less special types of cardboard can be used.
Die auf den beiden Seiten des Kartons aufgebrachten Barriereschichten aus Metall sind 'absolute' Sperrschichten und haben darüber hinaus noch den Vorteil, dass die beim Verarbeitungsprozess, insbesondere beim Knicken und Falten, und beim Transport etc. gelegentlich auftretenden Löcher bzw. Fehlstellen an bzw. in einer Barriereschicht aufgrund der intakten davor oder dahinter liegenden zweiten Schicht sich nicht so negativ auf die Haltbarkeit des verpackten Produkts auswirken können. Die doppelte Metallschicht führt also zu einer erhöhten Sicherheit der Produktqualität in Bezug auf z. B. die Haltbarkeit (Shelf-life) . Nach einer weiteren Lehre der Erfindung ist zwischen der Trägermaterialschicht und der Barriereschicht jeweils wenigstens eine Verbindungsschicht angeordnet. Eine solche auch als Haftvermittlerschicht bezeichnete Schicht sorgt für den besseren Kontakt zwischen dem Trägermaterial und den Barriereschichten.The metal barrier layers applied to both sides of the carton are 'absolute' barrier layers and have the additional advantage that the holes or imperfections occasionally occurring during processing, especially when folding and folding, and during transport etc. a barrier layer, because of the intact second layer in front of or behind it, cannot have a negative impact on the shelf life of the packaged product. The double metal layer thus leads to increased safety of the product quality with respect to e.g. B. Shelf life. According to a further teaching of the invention, at least one connecting layer is arranged between the carrier material layer and the barrier layer. Such a layer, also called an adhesion promoter layer, ensures better contact between the carrier material and the barrier layers.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass zwischen der Barriereschicht und der äußeren Siegelschicht jeweils wenigstens eine weitere Verbindungsschicht angeordnet ist . Auch durch diese Maßnahme wird die Haftung zwischen der Barriereschicht und der jeweils äußeren Siegelschicht verbessert.A further embodiment of the invention provides that at least one further connection layer is arranged between the barrier layer and the outer sealing layer. This measure also improves the adhesion between the barrier layer and the respective outer sealing layer.
In weiterer Ausgestaltung der Erfindung besteht die SauerstoffSperrschicht aus Al-Folie. Als Verbindungsschicht kann ein Haftvermittler auf Polymerbasis oder Klebstoffbasis verwendet werden.In a further embodiment of the invention, the oxygen barrier layer consists of Al foil. A polymer-based or adhesive-based adhesion promoter can be used as the connecting layer.
Die Siegelschicht besteht nach einer weiteren Lehre der Erfindung aus einem thermoplastischen Polymer, wobei das thermoplastische Polymer Polypropylen (PP) , Polyethylenterephthalat (PET) , Polyethylen (PE) , aus flüssigkristallinen Polymeren (LCP = liquid cristalline polymers) , Ethylen/Vinylalkohol (EVOH) oder Polyamid (PA) sein kann. Im Rahmen der Erfindung ist es jedoch auch möglich, das thermoplastische Polymer als ein Compound der vorgenannten Polymere auszubilden.According to a further teaching of the invention, the sealing layer consists of a thermoplastic polymer, the thermoplastic polymer polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), liquid crystalline polymers (LCP = liquid crystalline polymers), ethylene / vinyl alcohol (EVOH) or can be polyamide (PA). In the context of the invention, however, it is also possible to design the thermoplastic polymer as a compound of the aforementioned polymers.
In weiterer Ausgestaltung der Erfindung weisen die äußeren Siegelschichten eine Schichtdicke von 10 bis 40 g/m2 auf. Die auf die spätere Verbundpackung bezogene äußere Siegelschicht weist dabei bevorzugt eine Schichtdicke von 10 bis 20 g/m2 auf und die auf die spätere Verpackung bezogene innere Siegelschicht eine Schichtdicke von 20 bis 35 g/m2.In a further embodiment of the invention, the outer sealing layers have a layer thickness of 10 to 40 g / m 2 . The outer sealing layer relating to the later composite pack preferably has one Layer thickness of 10 to 20 g / m 2 and the inner sealing layer related to the subsequent packaging a layer thickness of 20 to 35 g / m 2 .
Nach einer anderen bevorzugten Weiterbildung der Erfindung ist als Barriereschicht eine Aluminiumfolie mit einer Schichtdicke von 5 bis 10 μm, bevorzugt 6 bis 8 μm, vorgesehen.According to another preferred development of the invention, an aluminum foil with a layer thickness of 5 to 10 μm, preferably 6 to 8 μm, is provided as the barrier layer.
Eine weitere Ausbildung der Erfindung sieht vor, dass die Verbindungsschicht (Haftvermittlerschicht) eine Schichtdicke von 4 bis 20 g/m2, bevorzugt 5 bis 10 g/m2, aufweist. Hierbei ist es besonders zweckmäßig, wenn die zwischen der Trägermaterialschicht und den Barriereschichten vorhandene Verbindungsschicht dicker ist als die Verbindungsschicht zwischen den Barriereschichten und den äußeren Siegelschichten.A further embodiment of the invention provides that the connection layer (adhesion promoter layer) has a layer thickness of 4 to 20 g / m 2 , preferably 5 to 10 g / m 2 . It is particularly expedient here if the connecting layer between the carrier material layer and the barrier layers is thicker than the connecting layer between the barrier layers and the outer sealing layers.
In weiterer Ausgestaltung der Erfindung kann das erfindungsgemäße Verbundmaterial in einem einzigen Arbeitsgang im Coextrusionsverfahren hergestellt werden.In a further embodiment of the invention, the composite material according to the invention can be produced in a single operation using the coextrusion process.
Die Erfindung wird nachfolgend anhand einer lediglich bevorzugte Ausführungsbeispiele darstellenden Zeichnung näher erläutert . In der Zeichnung zeigenThe invention is explained in more detail below with the aid of a drawing which represents only preferred exemplary embodiments. Show in the drawing
Fig. 1 ein erstes Ausführungsbeispiel eines erfindungsgemäßen Verbundmaterials,1 shows a first embodiment of a composite material according to the invention,
Fig. 2 ein zweites Ausführungsbeispiel eines erfindungsgemäßen Verbundmaterials undFig. 2 shows a second embodiment of a composite material according to the invention and
Fig. 3 ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Verbundmaterials . In den Figuren sind Beispiele der erfindungsgemäßen Verbundmaterialien schematisch im Querschnitt und nicht maßstabsgetreu dargestellt .Fig. 3 shows another embodiment of a composite material according to the invention. In the figures, examples of the composite materials according to the invention are shown schematically in cross section and not to scale.
Fig. 1 zeigt als Trägermaterial eine Kartonschicht 1, welche zum Schutz des Kartons vor dem flächigen Angriff von Wasser während des Autoklavierprozesses von zwei Barriereschichten 2 umgeben ist. Als Barriereschichten 2 können bevorzugt AI-Folie oder Schichten aus SiOx, LCP (= liquid cristalline polymere) , etc. zum Einsatz kommen.1 shows a cardboard layer 1 as the carrier material, which is surrounded by two barrier layers 2 to protect the cardboard from the flat attack of water during the autoclaving process. Al-foil or layers made of SiOx, LCP (= liquid crystalline polymers), etc. can preferably be used as barrier layers 2.
Nach außen hin ist der Verbund mit zwei Siegelschichten 3 versehen, die aus einem thermoplastischen Polymer bestehen, wobei das thermoplastische Polymer Polypropylen (PP) , Polyethylenterephthalat (PET) , Polyethylen (PE) , aus flüssigkristallinen Polymeren (LCP) ,On the outside, the composite is provided with two sealing layers 3, which consist of a thermoplastic polymer, the thermoplastic polymer polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), made of liquid-crystalline polymers (LCP),
Ethylen/Vinylalkohol (EVOH) oder Polyamid (PA) sein kann. Die Siegelschichten 3 ermöglichen ein Verschweißen des Verbundes und können auch aus mehreren Polymerschichten oder einem Compound daraus aufgebaut sein.Ethylene / vinyl alcohol (EVOH) or polyamide (PA) can be. The sealing layers 3 enable the composite to be welded and can also be constructed from a plurality of polymer layers or a compound thereof.
Fig. 2 zeigt ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Verbundmaterials, bei dem durch zusätzliche Verbindungsschichten 4 zwischen der Kartonschicht 1 und den Barriereschichten 2 eine verbesserte Verbundhaftung ermöglicht wird. Die Verbindungsschichten 4 bestehen aus einem Haftvermittler auf Polymer- oder Klebstoffbasis.FIG. 2 shows a further exemplary embodiment of a composite material according to the invention, in which improved composite adhesion is made possible by additional connecting layers 4 between the cardboard layer 1 and the barrier layers 2. The connection layers 4 consist of an adhesion promoter based on polymer or adhesive.
In Fig. 3 ist schließlich ein drittes Ausführungsbeispiel dargestellt, bei dem zwei weitere Verbindungsschichten 4 zwischen den Barriereschichten 2 und den außen liegenden Siegelschichten 3 vorhanden sind. Finally, FIG. 3 shows a third exemplary embodiment in which two further connecting layers 4 are present between the barrier layers 2 and the sealing layers 3 lying on the outside.

Claims

15. Januar 2003P A T E NT AN S P R Ü C H E January 15, 2003 P ATE NT TO SPRÜCHE
1. Verbundmaterial aus Papier oder Karton als Trägermaterial mit einer Kunststoffbeschichtung, insbesondere für licht-, gas- und flüssigkeitsdichte heißsiegelbare Packungen, wobei die1. Composite material made of paper or cardboard as a carrier material with a plastic coating, in particular for light, gas and liquid-tight heat-sealable packs, the
Kunststoffbeschichtung jeweils äußere Siegelschichten aufweist und zwischen der Trägermaterialschicht und einer Siegelschicht eine Barriereschicht aus Metall vorhanden ist, d a d u r c h g e k e n n z e i c h n e t, d a s s auf der anderen Seite der TrägermaterialSchicht (1) eine weitere Barriereschicht (2) vorgesehen ist.Plastic coating each has outer sealing layers and a barrier layer made of metal is present between the carrier material layer and a sealing layer, so that a further barrier layer (2) is provided on the other side of the carrier material layer (1).
2. Verbundmaterial nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t, d a s s zwischen der Trägermaterialschicht (1) und der Barriereschicht (2) jeweils wenigstens eine Verbindungsschicht (4) angeordnet ist.2. Composite material according to claim 1 or 2, d a d u r c h g e k e n e z e i c h n e t, that a s s between the carrier material layer (1) and the barrier layer (2) in each case at least one connecting layer (4) is arranged.
3. Verbundmaterial nach Anspruch 2 , d a d u r c h g e k e n n z e i c h n e t, d a s s zwischen der Barriereschicht (2) und der äußeren Siegelschicht (3) jeweils wenigstens eine weitere Verbindungsschicht (4) angeordnet ist.3. Composite material according to claim 2, d a d u r c h g e k e n n z e i c h n e t, that at least one further connection layer (4) is arranged between the barrier layer (2) and the outer sealing layer (3).
4. Verbundmaterial nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t, d a s s die Barriereschicht (2) aus Al-Folie besteht. 4. Composite material according to one of claims 1 to 3, characterized in that the barrier layer (2) consists of Al foil.
5. Verbundmaterial nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, d a s s als Verbindungsschicht (4) ein Haftvermittler auf Polymerbasis verwendet wird.5. Composite material according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t, that as a connecting layer (4) an adhesion promoter on a polymer basis is used.
6. Verbundmaterial nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, d a s s als Verbindungs Schicht (4) ein Haftvermittler auf Klebstof fbasis verwendet wird.6. Composite material according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t, as as a connecting layer (4) an adhesion promoter based on adhesive f is used.
7. Verbundmaterial nach einem der Ansprüche 1 bis 6, d a d u r c h g e k e n n z e i c h n e t, d a s s als Siegelschicht (3) ein thermoplastisches Polymer verwendet wird.7. Composite material according to one of claims 1 to 6, d a d u r c h g e k e n n z e i c h n e t, that as a sealing layer (3) a thermoplastic polymer is used.
8. Verbundmaterial nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer Polypropylen (PP) ist.8. Composite material according to claim 7, d a d u r c h g e k e n n z e i c h n e t, which is the thermoplastic polymer polypropylene (PP).
9. Verbundmaterial nach Anspruch 7 , d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer Polyethylenterephtalat (PET) ist.9. Composite material according to claim 7, d a d u r c h g e k e n n z e i c h n e t, which is the thermoplastic polymer polyethylene terephthalate (PET).
10. Verbundmaterial nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer Polyethylen (PE) ist.10. The composite material according to claim 7, d a d u r c h g e k e n n z e i c h n e t, which is the thermoplastic polymer polyethylene (PE).
11. Verbundmaterial nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer aus flüssigkristallinen Polymeren (LCP) besteht. 11. Composite material according to claim 7, characterized in that the thermoplastic polymer consists of liquid crystalline polymers (LCP).
12. Verbundmaterial nach Anspruch 7, d a d u r c h g' e k e n n z e i c h n e t, d a s s das thermoplastische Polymer Ethylen/Vinylalkohol (EVOH) ist .12. The composite material according to claim 7, d a d u r c h g 'e k e n n z e i c h n e t, that is the thermoplastic polymer ethylene / vinyl alcohol (EVOH).
13. Verbundmaterial nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer Polyamid (PA) ist.13. Composite material according to claim 7, d a d u r c h g e k e n n z e i c h n e t, which is the thermoplastic polymer polyamide (PA).
14. Verbundmaterial nach einem oder mehreren der Ansprüche 7 bis 13, d a d u r c h g e k e n n z e i c h n e t, d a s s das thermoplastische Polymer ein Compound der in den Ansprüchen 8 bis 13 genannten Polymere ist.14. Composite material according to one or more of claims 7 to 13, d a d u r c h g e k e n n z e i c h n e t, that the thermoplastic polymer is a compound of the polymers mentioned in claims 8 to 13.
15. Verbundmaterial nach einem der Ansprüche 1 bis 14, d a d u r c h g e k e n n z e i c h n e t, d a s s die äußeren Siegelschichten (3) eine Schichtdicke von 10 bis 40 g/m2 aufweisen.15. Composite material according to one of claims 1 to 14, characterized in that the outer sealing layers (3) have a layer thickness of 10 to 40 g / m 2 .
16. Verbundmaterial nach Anspruch 15, d a d u r c h g e k e n n z e i c h n e t, d a s s die auf die spätere Verbundpackung bezogene äußere Siegelschicht (3) eine Schichtdicke von 10 bis 20 g/m2 aufweist.16. Composite material according to claim 15, characterized in that the outer sealing layer (3) related to the later composite pack has a layer thickness of 10 to 20 g / m 2 .
17. Verbundmaterial nach Anspruch 15 oder 16, d a d u r c h g e k e n n z e i c h n e t, d a s s die auf die spätere Verpackung bezogene innere Siegelschicht (3) eine Schichtdicke von 20 bis 35 g/m2 aufweist. 17. Composite material according to claim 15 or 16, characterized in that the inner sealing layer (3) related to the subsequent packaging has a layer thickness of 20 to 35 g / m 2 .
18. Verbundmaterial nach einem der Ansprüche 1 bis 17, d a d u r c h g e k e n n z e i c h n e t, d a s s als Barriereschicht (2) eine Al-Folie mit einer Schichtdicke von 5 bis 10 μm vorgesehen ist.18. Composite material according to one of claims 1 to 17, d a d u r c h g e k e n n z e i c h n e t, as a barrier layer (2) an Al foil is provided with a layer thickness of 5 to 10 microns.
19. Verbundmaterial nach Anspruch 18, d a d u r c h g e k e n n z e i c h n e t, d a s s die Al-Folie eine Schichtdicke von 6 bis 8 μm aufweist .19. Composite material according to claim 18, d a d u r c h g e k e n n z e i c h n e t that the Al foil has a layer thickness of 6 to 8 microns.
20. Verbundmaterial nach einem der Ansprüche 2 bis 19, d a d u r c h g e k e n n z e i c h n e t, d a s s die Verbindungsschicht (4) eine Schichtdicke von 4 bis 20 g/m2 aufweist.20. Composite material according to one of claims 2 to 19, characterized in that the connecting layer (4) has a layer thickness of 4 to 20 g / m 2 .
21. Verbundmaterial nach Anspruch 19, d a d u r c h g e k e n n z e i c h n e t, d a s s die Verbindungsschicht (4) eine Schichtdicke von 5 bis 10 g/m2 aufweist.21. Composite material according to claim 19, characterized in that the connecting layer (4) has a layer thickness of 5 to 10 g / m 2 .
22. Verbundmaterial nach Anspruch 3 und 19, d a d u r c h g e k e n n z e i c h n e t, d a s s die zwischen der Trägermaterialschicht (1) und den Barriererschichten (2) vorhandene Verbindungsschicht dicker ist als die Verbindungsschicht (4) zwischen den Barriererschichten (2) und den äußeren Siegelschichten.22. Composite material according to claim 3 and 19, d a d u r c h g e k e n n z e i c h n e t, d a s s the connection layer between the carrier material layer (1) and the barrier layers (2) is thicker than the connection layer (4) between the barrier layers (2) and the outer sealing layers.
23. Verfahren zur Herstellung eines Verbundmaterials nach einem der Ansprüche 1 bis 22, d a d u r c h g e k e n n z e i c h n e t, d a s s das Verbundmaterial in einem einzigen Arbeitsgang im Coextrusiosverfahren hergestellt wird. 23. A method for producing a composite material according to any one of claims 1 to 22, characterized in that the composite material is produced in a single operation in the coextrusion process.
24. Zuschnitt für eine Verbundpackung, hergestellt nach einem der Ansprüche 1 bis 22.24. Blank for a composite package, produced according to one of claims 1 to 22.
25. Verbundfolie zur Herstellung von Verbundpackungen, hergestellt nach einem der Ansprüche 1 bis 22. 25. Composite film for the production of composite packs, produced according to one of claims 1 to 22.
EP03729479A 2002-01-18 2003-01-17 Composite material for light-, gas- and liquid-tight heat-sealing packagings Withdrawn EP1465768A2 (en)

Applications Claiming Priority (3)

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DE10202072A DE10202072A1 (en) 2002-01-18 2002-01-18 Composite material for light, gas and liquid tight, heat sealable packs
DE10202072 2002-01-18
PCT/EP2003/000429 WO2003059622A2 (en) 2002-01-18 2003-01-17 Composite material for light-, gas- and liquid-tight heat-sealing packagings

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TW200302777A (en) 2003-08-16
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