Methods and Systems For The Preparation Of Molded Plastic Articles Having A Structural Barrier Layer

摘要

Disclosed herein are methods and systems for the preparation of a co-injection molded multilayer plastic article. Some methods include co-extruding a combined polymeric stream having an interior core stream encased by an inner stream and an outer stream. One or more pulses in a thickness of the interior core stream create portions of an edge of the outer flow stream flowing along different streamlines. A first portion of an outer edge of the interior core stream flows beyond a second portion of the outer edge thereby forming one or more cohesion members that physically interlock the interior layer with the inner layer, with the outer layer or with both. Some embodiments reduce or eliminate a need for addition of an adhesive in the composite stream to prevent delamination of layers of the resulting multilayer plastic article. In some embodiments, cohesion members may be employed to produce a desired cosmetic effect in a resulting article.

主权项

1. A method of co-extruding a plurality of polymeric plastic material streams to produce a resulting molded plastic article, the method comprising the steps of:
forming a combined polymeric plastic stream in an injection nozzle, the combined stream comprising an interior core stream of a first polymeric material encased by an inner stream of a second polymeric material and an outer stream of the second polymeric material; injecting the combined stream into a mold cavity; and creating one or more controlled pulsations in a thickness of the interior core stream in the cavity such that a first portion of an outer edge of the interior core stream flows beyond a second portion of the outer edge of the interior core stream thereby forming one or more cohesion members that physically interlock an interior layer of the resulting molded plastic article formed from the interior core stream with an inner layer of the resulting molded plastic article formed from the inner stream, with an outer layer of the resulting molded plastic article formed from the outer stream, or with both.