Patent ID: 6422852
Filing Date: 2002-07-23
Classification: B29C

Abstract:
Filter device for extruders and injection molding machines for processing thermoplastics, comprising:a housing defining therein at least one main admission duct and at least one main outlet duct connected thereto, said housing also defining at least two sieve openings therein between said at least one main admission duct and said at least one main outlet duct; sieve carrier bolts disposed within said sieve openings, said carrier bolts defining ducts therein, said carrier bolts being displaceable within said sieve openings; filter elements exchangeably arranged in said ducts in said sieve carrier bolts; at least one partial admission duct connecting said main admission duct with said filter elements at least one blocking means moveable between a flow position wherein said blocking means does not hinder a flow of plastic moving from said main admission duct to said filter elements and a blocking position wherein said blocking means prevents the flow of plastic from the main admission duct to the at least one partial admission duct, wherein a) said filter elements in said sieve carrier bolts are formed in a shape of an oval, a long axis of the oval extending in a direction of a displacement of said sieve carrier bolts, a length of the long axis of the oval being such that only a length of said sieve carrier bolts necessary for sealing said sieve carrier bolts in said sieve openings is free of said filter elements; and b) each of said at least one partial admission is connected to at least one of said sieve openings with at least two inflow ducts.