EP0084827A2
Expired / Lapsed
EP
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Method for the manufacture of a deep-drawn object
Assignee: Tetra Laval Holdings and Finance SA
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Filing: 1983-01-14
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Granted: —
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Expires: 2003-01-14
Abstract
Abstract The invention relates to a laminate comprising an aluminium layer and a polyester layer, the aluminium foil layer being wrinkled or contracted into a large number of wrinkles which can be straightened out when the plastic material is stretched, without any breaking of the aluminium foil layer.
Inventors
- 👤 Ingvar Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:23
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29C; B29C51/00; B29C51/14; B29C61/00; B29C61/02; B32B15/20; B32B27/00; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B29K; B29K2067/00; B29K2705/00; B29K2705/02; B29L; B29L2009/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1043; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/24; Y10T428/24355; Y10T428/24446; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A laminate comprising on the one hand a layer of a metal foil, in particular aluminium foil, and on the other hand one or more layers of a plastic film characterized in that the metal foil layer, at least along one region intended for stretching or deep-drawing processing, is wrinkled or contracted into a very tight wrinkling or contraction pattern.
Claim 2
Dependent Claim
60 words
A laminate comprising on the one hand a layer of a metal foil, in particular aluminium foil, and on the other hand one or more layers of a plastic film characterized in that the metal foil layer, at least along one region intended for stretching or deep-drawing processing, is wrinkled or contracted into a very tight wrinkling or contraction pattern.
Claim 3
Dependent Claim
28 words
A laminate in accordance with claim 1, characterized in that the metal foil layer is attached to an adjacent plastic film or plastic films with very good adhesion.
Claim 4
Dependent Claim
23 words
A laminate in accordance with claim 1, characterized in that the metal foil layer is covered on both sides with a plastic layer.
Claim 5
Dependent Claim
17 words
A laminate in accordance with claim 1, characterized in that the plastic material is constituted of polyester.
Claim 6
Dependent Claim
27 words
A laminate in accordance with claim 1, characterized in that the metal foil layer is attached to said plastic layerswith the help of an intermediary adhesion layer.
Claim 7
Dependent Claim
94 words
A method for the manufacture of a laminated material suitable for deep-drawing or stretching in accordance with claim 1, characterized in that in a first operation one or more plastic film layers are subjected to a molecular-orientation stretching, that the metal foil layer in a second operation is laminated to the orientation-stretched plastic layer.or layers, and that finally the laminate formed is heated to such a degree that the oriented plastic layer or layers are caused to shrink, the plastic layers during the shrinkage operation at the same time contracting the metal foil layer.
Claim 8
Dependent Claim
72 words
A method in accordance with claim 6, characterized in that the metal foil layer is laminated a plastic layer,orientation-stretched in advance, the lamination being carried out at such a low temperature that the oriented plastic layer is not caused to shrink, and that the metal foil layer, moreover, is coated with a plastic layer or is laminated to a plastic film so as to be enveloped on both sides by plastic material.
Claim 9
Dependent Claim
37 words
A method in accordance with claim 6, characterized in that the orientation-stretched plastic foil is constituted of largely crystalline polyester and that the outer layers of the laminate are constituted of largely amorphous, so-called glycol-modified polyester (PETG).
Claim 10
Dependent Claim
24 words
A method in accordance with claim 7, characterized in that the lamination is performed with the help of an adhesion varnish or a glue.
References Cited (Backward Citations)
No citation records indexed.
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