VORRICHTUNG UND VERFAHREN ZUM KOEXTRUDIEREN.

摘要

The present invention provides a novel coextrusion apparatus (10) that includes a first flow channel (48, 52) of a greater width than a second flow channel (50), and an adjustable vane blade (72, 74) between the channels. By the use of interchangeable plates, this apparatus is able to prevent any selected layer or layers of a laminate from extending to the full laminate width. This result is obtained by the formation of an isolating edge that is an integral part of a layer or layers that extend the full laminate width. Also provided is a process for forming laminate having an isolating edge, and are novel coextruded laminate structures having isolating edges.