DE102006046082A1 - Multi-layer plastic-molded part comprises a plastic layer with barrier layer, and a brake line intended in the barrier layer having embrittlement, which is produced by irradiation of laser - Google Patents

Multi-layer plastic-molded part comprises a plastic layer with barrier layer, and a brake line intended in the barrier layer having embrittlement, which is produced by irradiation of laser Download PDF

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Publication number
DE102006046082A1
DE102006046082A1 DE102006046082A DE102006046082A DE102006046082A1 DE 102006046082 A1 DE102006046082 A1 DE 102006046082A1 DE 102006046082 A DE102006046082 A DE 102006046082A DE 102006046082 A DE102006046082 A DE 102006046082A DE 102006046082 A1 DE102006046082 A1 DE 102006046082A1
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Prior art keywords
barrier layer
plastic
layer
predetermined breaking
breaking line
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DE102006046082A
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German (de)
Inventor
Markus Betsche
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KraussMaffei Technologies GmbH
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KraussMaffei Technologies GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/007—Forming single grooves or ribs, e.g. tear lines, weak spots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C2045/0075—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping curing or polymerising by irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1646—Injecting parison-like articles
    • B29C2045/1648—Injecting parison-like articles the parison core layer being a barrier material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
    • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The multi-layer plastic-molded part comprises a plastic layer with an inner-lying barrier layer, and a brake line intended in the barrier layer. The barrier layer in the area of the brake line has embrittlement, which is produced by irradiation of laser. The molded part has a package or a container with embrittled areas of the barrier layer. The molded part is produced in a sandwich-injection process, where the barrier layer forms a core component surrounded by a film component of another plastic. The plastic-molded part is plastic foil or a plastic plate or a plastic tube. The multi-layer plastic-molded part comprises a plastic layer with an inner-lying barrier layer, and a brake line intended in the barrier layer. The barrier layer in the area of the brake line has embrittlement, which is produced by irradiation of laser. The molded part has a package or a container with embrittled areas of the barrier layer. The molded part is produced in a sandwich-injection process, where the barrier layer forms a core component surrounded by a film component of another plastic or the molded part is produced in a multi-layer co-extrusion method, where barrier layer forms one of the inner layers and is covered by multi layers. The plastic-molded part is plastic foil or a plastic plate or a plastic tube. An independent claim is included for a method for the production of plastic-molded part.

Description

Die Erfindung betrifft ein mehrschichtiges Kunststoff-Formteil mit wenigstens einer Schicht aus einem Kunststoff mit Barriereeigenschaften (Barriereschicht), insbesondere aus EVOH, wobei in der Barriereschicht eine Sollbruchlinie vorgesehen ist. Die Erfindung betrifft desweiteren ein Verfahren zur Herstellung eines derartigen Kunststoff-Formteils.The The invention relates to a multilayer plastic molded part with at least a layer of a plastic with barrier properties (barrier layer), in particular of EVOH, wherein in the barrier layer a predetermined breaking line is provided. The invention further relates to a method for producing such a plastic molding.

Aus dem Stand der Technik ist die Verwendung von Barriereschichten mit Sollbruchlinien in vielfältigen Ausgestaltungen bekannt.Out the prior art is the use of barrier layers with Rupture lines in diverse Embodiments known.

Die GB 2 252 093 A offenbart eine Barriereschicht bei einem Behälter mit einer ausreichend verdünnten Stelle als Sollbruchstelle zum Öffnen des Behälters, wobei die Barriereschicht ohne Metallschicht auskommt.The GB 2 252 093 A discloses a barrier layer in a container with a sufficiently dilute point as a predetermined breaking point for opening the container, wherein the barrier layer does not require a metal layer.

Aus der DE 33 21 572 A1 ist ein Behälterdeckel mit einer Sperrschicht aus einer Metallfolie bekannt, wobei eine Schwächungslinie durch Dehnung oder Pressung der Metallfolie erzeugt wird.From the DE 33 21 572 A1 For example, a container lid having a barrier layer of a metal foil is known, wherein a line of weakness is created by stretching or pressing the metal foil.

Die DE 100 48 636 A1 offenbart eine Airbag-Abdeckung mit einer Barriereschicht aus einer metallischen oder einer nichtmetallischen Folie. Mittels Laserbearbeitung wird eine Sollbruchlinie erzeugt, die eine exakte Restwanddicke der Airbag-Abdeckung im Bereich der Sollbruchlinie erlaubt. Der Materialabtrag der Airbag-Abdeckung erfolgt von einer Seite durch die Airbag-Abdeckung hindurch bis in die Barriereschicht hinein, wobei diese stellenweise ausgedünnt wird.The DE 100 48 636 A1 discloses an airbag cover having a barrier layer of a metallic or a non-metallic foil. By means of laser processing, a predetermined breaking line is generated, which allows an exact residual wall thickness of the airbag cover in the region of the predetermined breaking line. The removal of material from the airbag cover takes place from one side through the airbag cover into the barrier layer, whereby it is partially thinned out.

DE 696 27 578 T2 offenbart ebenfalls eine Airbag-Abdeckung mit einer Sollbruchlinie, wobei die Sollbruchlinie durch eine geeignet starke Materialverdünnung sowohl in den Deckschichten als auch in der Barriereschicht gebildet wird. Als Barriereschicht kommen verschiedene Kunststoffe in Betracht wie beispielsweise ein TPE. DE 696 27 578 T2 also discloses an airbag cover with a predetermined breaking line, wherein the predetermined breaking line is formed by a suitably thick material dilution both in the outer layers and in the barrier layer. As a barrier layer, various plastics come into consideration, such as a TPE.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein mehrschichtiges Kunststoff-Formteil mit wenigstens einer Barriereschicht und einer Sollbruchlinie in der Barriereschicht anzugeben, wobei die Sollbruchlinie ohne Materialabtrag und insbesondere ohne nennenswerte Verminderung der Barriereeigenschaften gebildet worden ist. Desweiteren liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung derartiger mehrschichtiger Kunststoff-Formteile anzugeben.outgoing From this prior art, the invention is based on the object a multilayer plastic molded part with at least one barrier layer and a predetermined breaking line in the barrier layer, wherein the predetermined breaking line without material removal and in particular without appreciable Reduction of the barrier properties has been formed. Furthermore the invention has the object, a method for producing specify such multilayer plastic molded parts.

Die Lösung der zuerst genannten Aufgabe erfolgt duch ein Kunststoff-Formtel mit den Merkmalen von Anspruch 1. Die Lösung der zweitgenannten Aufgabe erfolgt durch ein Verfahren mit den Merkmalen von Anspruch 7 oder 10. Dadurch, dass im Bereich der Sollbruchstelle eine Versprödung des Kunststoffs der Barriereschicht vorgenommen wird, können – im Gegensatz zu den Materialschwächungen gemäß dem Stand der Technik – die Barriereeigenschaften über die gesamte Dicke der Barriereschicht auch im Bereich der Sollbruchlinie aufrecht erhalten werden. Die Versprödung kann durch Einwirkung von Laserstrahlung erzeugt werden, die das Hautmaterial ohne nennenswerte Beeinflussung durchdringt und lediglich im Bereich der Sollbruchlinie das Kunststoffmaterial der Barriereschicht versprödet und damit leicht brüchig macht. Hierzu werden die Barriereschichten so gewählt, dass die Absorption der Strahlung nur in der Barriereschicht eine Versprödung hervorruft, nicht aber bei den äußeren Schichten. Die Absorptionseigenschaften können auch mit ausgewählten Materialzusätzen, wie beispielsweise Farben oder Funktionsadditiven, angepasst werden.The solution The first task is done by a plastic molding with the features of claim 1. The solution of the second-mentioned object is carried out by a method having the features of claim 7 or 10. The fact that in the region of the predetermined breaking point embrittlement of the plastic the barrier layer is made can - in contrast to the material weakenings according to the state the technology - the Barrier properties over the entire thickness of the barrier layer also in the area of the predetermined breaking line be maintained. The embrittlement can be caused by exposure be generated by laser radiation, the skin material without significant Influencing penetrates and only in the region of the predetermined breaking line the plastic material of the barrier layer embrittles and thus easily brittle power. For this purpose, the barrier layers are chosen so that the absorption of the radiation causes embrittlement only in the barrier layer, but not in the outer layers. The absorption properties can also with selected ones Material additives, such as colors or function additives.

Insbesondere bei Barriereschichten aus EVOH ist es schwierig, Sollbruchlinien zu erzeugen, da es sich bei EVOH um ein sehr reißfestes bzw. reißstabiles Material handelt. Um gleichwohl eine handhabbare Sollbruchlinie durch Materialverdünnung zu erzeugen, müsste die Schichtdicke soweit reduziert werden, dass sie beim Sandwichspritzgießen nicht mehr herstellbar ist. Um gleichwohl auch bei EVOH-Barriereschichten eine Sollbruchlinie erzielen zu können, müssen im Bereich der Sollbruchlinie in dem Kunsttoff-Formteil Abschnitte ohne EVOH-Barriereschicht gebildet werden, was sich nachteilig auf die Barriereeigenschaften des Kunststoff-Formteils als Ganzes auswirkt.Especially barrier layers made of EVOH are difficult to crack lines to produce, since it is a very tear-resistant or tear-resistant EVOH Material acts. Nevertheless, a manageable fracture line by diluting the material to produce the layer thickness are reduced so much that they are not in sandwich injection molding is more manufacturable. But also with EVOH barrier layers to be able to achieve a predetermined breaking line must be in the area of the predetermined breaking line formed in the Kunsttoff molding portions without EVOH barrier layer be, which adversely affects the barrier properties of the plastic molding as a whole affects.

Verfahrenstechnisch erfolgt in einem ersten Schritt die Herstellung des mehrschichtigen Kunststoff-Formteil mittels des sogenannten und an sich bekannten Sandwich-Spritzgießens. Dabei werden unterschiedliche Kunststoffe nacheinander oder simultan in eine Werkzeugkavität eingespritzt, wobei sich mehrschichtige Kunststoff-Formteile mit einer geschlossenen Aussenhaut aus einem Material A und einem Kern aus einem Material B ergeben. Im Fall der vorliegenden Erfindung wird das Material A von dem außenliegenden Kunststoff-Material gebildet, beispielsweise PP, und das Material B von einem Kunststoff mit Barriereeigenschaften, beispielsweise EVOH. In einem zweiten Schritt wird das fertige Kunststoff-Formteil von einem Laser oder einer anderen geeigneten Strahlungsquelle entlang einer Sollbruchlinie bestrahlt, um dort eine Versprödung der Barriereschicht zu erzeugen und die Barriereschicht brüchig zu machen.process engineering in a first step, the production of the multilayered Plastic molding by means of the so-called and known Sandwich injection molding. there be different plastics in succession or simultaneously in a tool cavity injected, with multilayer plastic molded parts with a closed outer skin made of a material A and a core made of a material B. In the case of the present invention the material A is from the outside Plastic material formed, for example, PP, and the material B of a plastic with barrier properties, such as EVOH. In a second step, the finished plastic molding of along a laser or other suitable radiation source a predetermined breaking line irradiated to there embrittlement of the barrier layer to generate and make the barrier layer fragile.

Mehrschichtige Kunststoff-Formteile gemäß der Erfindung können aber auch im Mehrschicht-Koextrusionsverfahren hergestellt werden, wobei eine Barriereschicht und wenigstens eine weitere Schicht eines anderen Kunststoffes über ein Extrusionswerkzeug ausgetragen werden, und wobei nachfolgend eine Bestrahlung der Barriereschicht im Bereich der Sollbruchlinie durch die äußeren Schichten hindurch mittels elektromagnetischer Strahlung, insbesondere Laserstrahlung, erfolgt, wobei die Barriereschicht entlang der Sollbruchlinie versprödet wird.However, multilayer plastic molded parts according to the invention can also be produced in the multi-layer coextrusion process, wherein a barrier layer and at least one further layer of another plastic are discharged via an extrusion die, and wherein subsequently an irradiation of the barrier layer in the region of the predetermined breaking line through the outer layers by means of electromagnetic radiation, in particular laser radiation occurs, wherein the barrier layer is embrittled along the predetermined breaking line.

Nachfolgend soll die Erfindung anhand von Ausführungsbeispielen und unter Bezugnahme auf die 1 bis 9 näher beschrieben werden.Hereinafter, the invention with reference to embodiments and with reference to the 1 to 9 be described in more detail.

Die 1 zeigt einen Kunststoff-Schraubverschluß 1 mit den typischen Schlitzen 2, die von Stegen 3 unterbrochen sind. Diese bilden zusammen eine umlaufende Sollbruchlinie, entlang derer sich der obere Teil 1a des Schraubverschlusses von dem unteren Rand 1b des Schraubverschlusses trennen läßt, so dass der Schraubverschluss aufdreht werden kann. Der Schraubveschluss weist in der Regel eine äußere und eine innere Schicht auf, zwischen denen eine Barriereschicht vorgesehen ist. Die Schlitze 2 stellen daher systembedingt eine Schwächung der Barriereeigenschaften des Schraubverschlusses dar.The 1 shows a plastic screw cap 1 with the typical slots 2 by Stegen 3 are interrupted. These together form a circumferential predetermined breaking line, along which the upper part 1a the screw cap from the bottom edge 1b of the screw can be disconnected, so that the screw can be turned on. The Schraubveschluss usually has an outer and an inner layer, between which a barrier layer is provided. The slots 2 therefore represent a systemic weakening of the barrier properties of the screw cap.

Gemäß der Erfindung soll nun anstelle der Schlitze 2 eine durchgehende Barriereschicht und gleichwohl eine Sollbruchstelle vorgesehen werden, so dass sich der Schraubverschluss in üblicher Weise öffnent läßt. 2 zeigt einen Schnitt durch den unteren Bereich des Schraubverschlusses 1 aus 1. Der Schraubverschluss weist eine Außenschicht 4 aus PP auf, die sich sowohl auf der Außenseite 4a als auch auf der Innenseite 4b befindet und auch den unteren Rand 1b umhüllt. Darin eingebettet liegt die eigentliche Barriereschicht 5, beispielsweise aus einem EVOH. Die in der 2 dargestellten von der Innenseite 4b vorstehenden Wülste 7 sind Teil des Gewindes des Schraubverschlusses. Im Bereich der Sollbruchlinie 6 weist der Schraubverschluss 1 eine insgesamt reduzierte Wandstärke auf, wobei jedoch gewährleistet ist, dass eine Barriereschicht 5 ausreichender Dicke vorhanden ist. Dieser Bereich wird mittels eines Lasers 8 geeigneter Wellenlänge bestrahlt, um die Barriereschicht aus EVOH zu verspröden und damit leicht brüchig zu machen. Die Bestrahlung erfolgt vorzugsweise über den gesamten Umfang des Schraubverschlusses entlang der Sollbruchlinie 6; bedarfsweise kann die Bestrahlung auch abschnittsweise unterbrochen werden. 3 zeigt die Situation im Bereich der Sollbruchlinie 6 vor der Bestrahlung und die 4 nach der Bestrahlung. Im Bereich der Sollbruchlinie 6 ist das EVOH versprödet worden, was mit der gepunkteten Darstellung der Barriereschicht 5 in diesem Bereich veranschaulicht werden soll. Durch die Versprödung wird das Material in diesem Bereich leicht brüchig und kann gut seine Funktion als Sollbruchlinie erfüllen. Andererseits ändert sich nicht die Dicke der Barriereschicht und die Barriereeigenschaften bleiben unverändert.According to the invention, instead of the slots now 2 a continuous barrier layer and yet a predetermined breaking point are provided so that the screw can be opened in the usual way. 2 shows a section through the lower portion of the screw cap 1 out 1 , The screw cap has an outer layer 4 made of PP, which is both on the outside 4a as well as on the inside 4b located and also the bottom 1b envelops. Embedded in it lies the actual barrier layer 5 , for example from an EVOH. The in the 2 presented from the inside 4b protruding beads 7 are part of the thread of the screw cap. In the area of the predetermined breaking line 6 has the screw cap 1 an overall reduced wall thickness, but it is ensured that a barrier layer 5 sufficient thickness is available. This area is by means of a laser 8th irradiated appropriate wavelength to embrittle the barrier layer of EVOH and thus make it easily brittle. The irradiation preferably takes place over the entire circumference of the screw cap along the predetermined breaking line 6 ; If necessary, the irradiation can also be interrupted in sections. 3 shows the situation in the area of the predetermined breaking line 6 before the irradiation and the 4 after the irradiation. In the area of the predetermined breaking line 6 the EVOH has been embrittled, what with the dotted representation of the barrier layer 5 should be illustrated in this area. The embrittlement makes the material in this area easily brittle and can easily fulfill its function as a predetermined breaking line. On the other hand, the thickness of the barrier layer does not change and the barrier properties remain unchanged.

In den 5 bis 8 ist ein weiteres Ausführungsbeispiel gezeigt. Gemäß 5 weist eine Verschlußkappe 9 für medizinische Infusionsflaschen auf ihrer Oberseite eine Reißlasche 10 auf, mittels derer ein Teil der Oberseite der Verschußkappe entlang einer Sollbruchlinie 11 abgetrennt werden kann. In der 6 ist der obere Teil der Verschlußkappe teilweise geschnitten dargestellt. Die Seitenwand 12 und die Oberseite 13 weisen eine Außenschicht 4 aus PP und eine innenliegende Barriereschicht 5 aus EVOH auf, die beide im Bereich der Sollbruchlinie 11 verdünnt sind. Die Verdünnung ist jedoch nicht so stark ausgeprägt, dass damit allein die Funktion einer Sollbruchlinie 11 erfüllt werden könnte. Die Reißlasche 10 kann aus einem einzigen Material bestehen, vorliegend also beispielweise aus PP. Die Oberseite 13 wird entlang der Sollbruchlinie 11 mittels eines Lasers bestrahlt, um die Barriereschicht aus EVOH zu verspröden und damit leicht brüchig zu machen. Die 7 zeigt die Situation vor und die 8 nach der Bestrahlung. Im Bereich der Sollbruchlinie 11 ist das EVOH versprödet worden, was mit der gepunkteten Darstellung der Barriereschicht 5 in diesem Bereich veranschaulicht werden soll.In the 5 to 8th another embodiment is shown. According to 5 has a closure cap 9 for medical infusion bottles on its top a pull tab 10 on, by means of which a part of the top of the Verschußkappe along a predetermined breaking line 11 can be separated. In the 6 the upper part of the cap is shown partially cut. The side wall 12 and the top 13 have an outer layer 4 made of PP and an inner barrier layer 5 from EVOH, both in the area of the fracture line 11 are diluted. However, the dilution is not so pronounced that it alone serves the function of a predetermined breaking line 11 could be met. The pull tab 10 can consist of a single material, in the present example, for example, from PP. The top 13 becomes along the break line 11 irradiated by a laser to embrittle the barrier layer of EVOH and thus make it easily brittle. The 7 shows the situation before and the 8th after the irradiation. In the area of the predetermined breaking line 11 the EVOH has been embrittled, what with the dotted representation of the barrier layer 5 should be illustrated in this area.

In der 9 ist als weiteres Ausführungsbeispiel ein Deckel 14 einer Lebensmittelverpackung gezeigt. Der Deckel 14 weist mehrere Schichten auf, darunter eine innenliegende Barriereschicht. Im Randbereich ist eine umlaufende Sollbruchlinie 15 vorgesehen, die durch Versprödung des Materials der Barriereschicht erzeugt worden ist, beispielsweise durch Bestrahlung mittels eines Lasers geeigneter Wellenlänge, wie bei den oben beschriebene Ausführungsbeispielen. Bei einer fertigen Verpackung mit einem Deckel 14 gemäß der vorliegenden Erfindung kann mittels eines Rings 16 der Deckel entlang der Sollbruchlinie 15 aufgerissen und die Verpackung geöffnet werden.In the 9 is a lid as another embodiment 14 shown a food packaging. The lid 14 has several layers, including an inner barrier layer. In the edge area is a circumferential predetermined breaking line 15 provided by embrittlement of the material of the barrier layer, for example by irradiation by means of a laser of suitable wavelength, as in the embodiments described above. In a finished package with a lid 14 According to the present invention, by means of a ring 16 the lid along the predetermined breaking line 15 torn open and the packaging is opened.

Anstelle eines Lasers können auch andere Strahlungsquellen mit geeigneter elektromagnetischer Strahlung vorgesehen werden, solange nur in der Barriereschicht eine Versprödung des Kunststoff-Materials der Barriereschicht erfolgt, während die anderen Schichten weitgehend unbeeinflußt bleiben. Eine geringfügige Erwärmung des Hautmaterials beim Durchdringen der Strahlung kann hingenommen werden.Instead of a laser can also other radiation sources with suitable electromagnetic Radiation be provided as long as only in the barrier layer an embrittlement the plastic material of the barrier layer takes place while the remain largely unaffected to other layers. A slight warming of the Skin material penetrating the radiation can be tolerated.

11
Schraubverschlußscrew
1a1a
Oberer Teil des SchraubverschlussesOberer Part of the screw cap
1b1b
Unterer Rand des Schraubverschlusseslower Edge of the screw cap
22
Schlitzslot
33
Stegweb
44
Außenschichtouter layer
4a4a
Aussenseiteoutside
4b4b
Innenseiteinside
55
Barriereschichtbarrier layer
66
SollbruchlinieLine of weakness
77
Gewindethread
88th
Laserlaser
99
Verschlußkappecap
1010
Reißlaschetear tab
1111
SollbruchlinieLine of weakness
1212
SeitenwandSide wall
1313
Oberseitetop
1414
Deckelcover
1515
SollbruchlinieLine of weakness
1616
Ringring

Claims (12)

Mehrschichtiges Kunststoff-Formteil mit wenigstens einer Schicht aus einem Kunststoff mit Barriereeigenschaften (Barriereschicht), insbesondere aus EVOH, wobei in der Barriereschicht eine Sollbruchlinie vorgesehen ist, dadurch gekennzeichnet, dass die Barriereschicht im Bereich Sollbruchlinie eine durch Bestrahlung der Sollbruchlinie, insbesondere durch Bestrahlung mittels eines Lasers, erzeugte Versprödung des Kunststoffs der Barriereschicht aufweist.Multilayer plastic molding with at least one layer of a plastic having barrier properties (barrier layer), in particular of EVOH, wherein in the barrier layer a predetermined breaking line is provided, characterized in that the barrier layer in the region of predetermined breaking line by irradiation of the predetermined breaking line, in particular by irradiation by means of a Lasers, produced embrittlement of the plastic of the barrier layer. Kunststoff-Formteil nach Anspruch 1, dadurch gekennzeichnet, dass die Barriereschicht eine der innenliegenden Schichten ist.Plastic molding according to claim 1, characterized that the barrier layer is one of the inner layers. Kunststoff-Formteil nach Anspruch 1 oder 2, gekennzeichnet durch eine Barriereschicht aus EVOH und diese umgebende Schichten aus PP.Plastic molding according to claim 1 or 2, characterized through a barrier layer of EVOH and these surrounding layers from PP. Kunststoff-Formteil nach einem der Ansprüche 1 bis 3 dadurch gekennzeichnet, dass es sich um eine Verpackung oder ein Behältnis mit einer Barriereschicht mit verspröderten Bereichen der Barriereschicht handelt.Plastic molding according to one of claims 1 to 3, characterized in that it is a packaging or a container with a barrier layer with embrittled areas of the barrier layer is. Kunststoff-Formteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es sich um ein im Sandwich-Spritzgießverfahren hergestelltes Kunststoff-Formteil handelt, wobei die Barriereschicht die Kernkomponente bildet, die von einer Hautkomponente eines anderen Kunststoffes umgeben istPlastic molding according to one of claims 1 to 4, characterized in that it is a sandwich injection molding produced plastic molding is, wherein the barrier layer the core component is that of a skin component of another Plastic is surrounded Kunststoff-Formteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es sich um ein im Mehrschicht-Koextrusionsverfahren hergestelltes Kunststoff-Formteil handelt, insbesondere um eine Kunststofffolie, eine Kunststoffplatte oder ein Kunststoffrohr, wobei die Barriereschicht eine der innenliegenden Schichten bildet und von einer oder mehreren weiteren Schichten bedeckt ist.Plastic molding according to one of claims 1 to 4, characterized in that it is a multilayer coextrusion manufactured plastic molding is, in particular a plastic film, a plastic plate or a plastic tube, wherein the barrier layer is one of the inner Layers forms and of one or more further layers is covered. Verfahren zur Herstellung einer Kunststoff-Formteils mit wenigstens einer Schicht aus einem Kunststoff mit Barriereeigenschaften (Barriereschicht), insbesondere aus EVOH, wobei in der Barriereschicht eine Sollbruchlinie vorgesehen ist, dadurch gekennzeichnet, dass das Kunststoff-Formteil im Sandwich-Spritzgießverfahren hergestellt wird, wobei eine Kern- und eine Hautkomponente in ein Formwerkzeug eingespritzt werden, wobei die Kernkomponente aus einem Kunststoff mit Barriereeigenschaften besteht, so dass die Kernkomponente eine Barriereschicht bildet, und dass nachfolgend eine Bestrahlung der Kernkomponente im Bereich der Sollbruchlinie durch die Hautkomponente hindurch mittels elektromagnetischer Strahlung, insbesondere Laserstrahlung, erfolgt, wobei die Kernkomponente entlang der Sollbruchlinie versprödet wird.Process for producing a plastic molding with at least one layer of a plastic with barrier properties (Barrier layer), in particular of EVOH, being in the barrier layer a predetermined breaking line is provided, characterized in that the plastic molding is produced by sandwich injection molding, wherein a core and a skin component injected into a mold be, the core component of a plastic with barrier properties such that the core component forms a barrier layer, and that subsequently irradiation of the core component in the range the predetermined breaking line through the skin component by means of electromagnetic Radiation, in particular laser radiation takes place, wherein the core component along the predetermined breaking line becomes brittle becomes. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Bestrahlung innerhalb der Spritzgießmaschine bei geöffnetem Formwerkzeug vorgenommen wird, bevor das Kunststoff-Formteil aus dem Formwerkzeug entfernt wird.Method according to claim 7, characterized in that that the irradiation within the injection molding machine when open Forming tool is made before the plastic molding from the Mold is removed. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Bestrahlung außerhalb der Spritzgießmaschine vorgenommen wird, und zwar unmittelbar nachdem das Kunststoff-Formteil aus dem Formwerkzeug entfernt worden ist und bevor das Kunststoff-Formteil auf Umgebungstemperatur abgekühlt ist.Method according to claim 7, characterized in that that the radiation is outside the injection molding machine is made, and immediately after the plastic molding has been removed from the mold and before the plastic molding cooled to ambient temperature is. Verfahren zur Herstellung einer Kunststoff-Formteils mit wenigstens einer Schicht aus einem Kunststoff mit Barriereeigenschaften (Barriereschicht), insbesondere aus EVOH, wobei in der Barriereschicht eine Sollbruchlinie vorgesehen ist, dadurch gekennzeichnet, dass das Kunststoff-Formteil im Mehrschicht-Koextrusionsverfahren hergestellt wird, wobei eine Barriereschicht und wenigstens eine weitere Schicht eines anderen Kunststoffes über ein Extrusionswerkzeug ausgetragen werden, und dass nachfolgend eine Bestrahlung der Barriereschicht im Bereich der Sollbruchlinie durch die äußeren Schichten hindurch mittels elektromagnetischer Strahlung, insbesondere Laserstrahlung, erfolgt, wobei die Barriereschicht entlang der Sollbruchlinie versprödet wird.Process for producing a plastic molding with at least one layer of a plastic with barrier properties (Barrier layer), in particular of EVOH, being in the barrier layer a predetermined breaking line is provided, characterized in that the plastic molding is produced in the multi-layer coextrusion process, wherein a barrier layer and at least one other layer of another Plastic over an extrusion die are discharged, and that below an irradiation of the barrier layer in the region of the predetermined breaking line through the outer layers through by means of electromagnetic radiation, in particular laser radiation, takes place, wherein the barrier layer is embrittled along the predetermined breaking line. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass die Bestrahlung innerhalb der Extrusionslinie vorgenommen wird.Method according to claim 10, characterized in that that the irradiation is carried out within the extrusion line. Verfahren nach einem der Ansprüche 7 bis 11. dadurch gekennzeichnet, dass zur Anpassung des Absorptionsgrades der Strahlung Farb- oder Funktionsadditive verwendet werden, um das Material der Barriereschicht(en) zu modifizieren und gezielt die Barriereschicht zu verspröden.Method according to one of claims 7 to 11, characterized that for adjusting the absorption of the radiation color or functional additives used to modify the material of the barrier layer (s) and specifically to embrittle the barrier layer.
DE102006046082A 2006-09-28 2006-09-28 Multi-layer plastic-molded part comprises a plastic layer with barrier layer, and a brake line intended in the barrier layer having embrittlement, which is produced by irradiation of laser Withdrawn DE102006046082A1 (en)

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