Laminates of polyethylene foam with an anisotropic pore...

Details Laminates of polyethylene foam with an anisotropic pore... Laminates of polyethylene foam with an anisotropic pore...

B - Operations, Transporting

32

B

154/90.6

B32B 5/20 (2006.01) B32B 5/32 (2006.01) B32B 27/00 (2006.01)

Patent

CA 1071086

LAMINATES OF POLYETHYLENE FOAM WITH AN ANISOTROPIC PORE STRUCTURE Abstract of the Disclosure A process for the production of cross-linked polyethylene foam layers which have an anisotropic pore structure in at least one internal layer, wherein at least three polyethylene sheets which contain equal quantities of peroxide as cross- linking agent and differing quantities of a chemical blowing agent are arranged as a multilayer structure in such a way that the two external layers are formed by the sheets which contain a smaller proportion of blowing agent, and the struc- ture is heated, preferably in a continuous heating furnace, so that the individual sheets are cross-linked and at the same time welded together to form a laminate which is subse- quently foamed by increasing the temperature to between 190 and 250°C. Le A 16 242

246026

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