The coextrusion device (20) of the present invention can be used with conventional extruders (24-26) and extrusion dies (90) for forming layered products (91) from at least two materials. It includes a manifold (21) for receiving a plurality of extruded feed materials (A, B, C) and a feedblock (22) receiving...http://www.google.ca/patents/US4405547?utm_source=gb-gplus-sharePatent US4405547 - Method of coextruding diverse materials
