Patent ID: 6945764
Filing Date: 2005-09-20
Classification: B29C

Abstract:
1. A die system for extruding plastic products, said plastic flowing through a passage constructed in a series of assembled modules and extending from an upstream inlet to a downstream outlet, said products being formed in accordance with the cross section of the outlet of the system, said die system comprising: at least one distribution module having a plurality of distribution channels constructed therein to form a portion of the die system passage, each of said distribution channels constructed to supply a portion of the plastic flow; a die module having an extrusion passage constructed therein to form a portion of the die system passage to receive flowing plastic from said distribution channels and to extrude said plastic through the outlet of said die system to form the extruded product; and wherein said die system outlet cross section is divided into preselected flow regions, said regions having non-uniform flow areas identified for their critical distribution requirements and at least some of which having irregular shape with different flow requirements; and wherein, at least one of said distribution channels provides plastic flow directly to one of said flow regions; and further wherein the flow volume provided by said at least one distribution channel is determined by the ratio of the cross sectional area of the preselected region supplied thereby, to the cross sectional area of the die system outlet.