Coextrusion device

Details Coextrusion device Coextrusion device

B - Operations, Transporting

29

C

18/746

B29C 47/06 (2006.01) B29C 47/04 (2006.01)

Patent

CA 1159619

5426 Abstract of the Disclosure The coextrusion device of the present invention can be used with conventional extruders and extrusion dies for forming layered products from at least two materials, It includes a manifold for receiving a plurality of extruded feed materials and a feedblock receiving the feed material from the manifold. The feedblock includes first and second faces entrance ports in the first face corresponding to the number of feed materials, channel means passing through the feedblock between the first and second faces directing each feed material into at least one separate profile, and exit ports in the second face corresponding to the number of channel means, defining a first profile for each feed material. An adaptor is provided for receiving the first profiles from the feedblock and includes first and second faces an entrance port in the first face receiving said first profiles, an exit port in the second face corres- ponding to the entrance of the extrusion die and, a transi- tion zone between the entrance and exit ports wherein the first profiles become contiguous and the overall configuration of the contiguous first profiles is adapted for receipt by the extrusion die. The device can further include a reverser plate and alternate feedblocks having different exit ports. Lastly, a method is provided for reducing perturbation while coextruding, utilizing a device of the present invention.

384695

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