Coextruded protective boundary multilayered articles and...

Details Coextruded protective boundary multilayered articles and... Coextruded protective boundary multilayered articles and...

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/58 (2006.01) B29C 47/70 (2006.01)

Patent

CA 2146011

A process and apparatus for the coextrusion of a multilayer polymeric body is provided which incorporates protective boundary layers into the body, protecting the layers from instability and breakup during layer formation and multiplication. The process includes the steps of providing at least first (11) and second (12) streams of heat plastified extrudable thermoplastic mate- rial which are combined to form a composite stream having the first substreams and second substreams interdigitated. A third stream (24) of heat plastified thermoplastic material is supplied to the exterior surfaces of the composite stream to form protective boulldaly layers adjacent the walls of the coextrusion apparatus through which the heat plastified polymer streams pass. Layer instability and breakup are avoided using process conditions which would otherwise adversely affect the optical and/or mechani- cal properties of the articles which are formed.

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