Patent ID: 8021597
Filing Date: 2011-09-20
Classification: B29C,B29K,B29L,B65D

Abstract:
1. A method for producing multilayer hollow plastic bodies to be blow-molded, comprising the steps of: feeding two or more molten plastic materials from extruders into an extrusion head; distributing the plastic materials with two or more circumferential distributors to form a two-layer or multilayer tubular preform; flowing the formed multilayer tubular preform through a cylindrical reservoir; inside the cylindrical reservoir, deflecting the molten plastic material from an inner layer of the two-layer or multilayer tubular preform to a colored outer layer of the two-layer or multilayer tubular preform within the cylindrical reservoir and incorporating the deflected molten plastic material in the colored outer layer to form a viewing strip; and ejecting the multilayer tubular preform with the viewing strip through a controllable annular nozzle into a mold for blow-molding the hollow plastic bodies.