Method for producing a multilayer coextrudate and a...

B - Operations – Transporting – 29 – C

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B29C 47/06 (2006.01) B32B 27/06 (2006.01) B32B 37/00 (2006.01) C09J 7/02 (2006.01)

Patent

CA 2349246

The invention relates to a method for producing a multi-layer coextrudate comprising a plastic material layer which has release properties with regard to adhesives, whereby the materials which create the release properties are arranged inside the plastic material layer. A first web (2, 22) is provided during the production of the composite. An adhesive layer (3, 23) is applied to one side of said web. The plastic material layer (4, 24) having the release properties is then applied onto said adhesive layer and is bonded with a second web (5, 25). The multilayer coextrudate is characterized in that at least two plastic material films (2, 5; 22, 25) are provided between which an adhesive layer (3, 23) and an additional layer (4, 24) having release properties with regard to the adhesive are applied.

L'invention concerne un procédé de production d'un co-extrudé multicouche, comportant une couche de matière plastique, qui présente des caractéristiques de séparation vis à vis d'adhésifs, les matériaux, conférant à ladite couche de matièrelastique ses caractéristiques de séparation, étant disposés dans celle-ci. Lors de la production du co-extrudé, une face d'une première bande (2, 22) est pourvue d'une couche d'adhésif (3, 23) sur laquelle est appliquée la couche de matière plastique (4, 24) présentant des caractéristiques de séparation et étant elle-même assemblée avec une seconde bande (5, 25). Le co-extrudé multicouche obtenu se caractérise en ce qu'il comporte au moins deux films de matière plastique (2, 5; 22, 25) entre lesquels sont disposées une couche d'adhésif (3, 23) et une autre couche (4, 24) présentant des caractéristiques de séparation vis à vis de l'adhésif.

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