Extrusion die with circumferential distribution groove

Abstract

An extrusion die has a cylindrical body with an outer cylindrical wall, opposite first and second end walls, an axial bore extending therethrough, and bores for mounting the die to the extrusion system. The cylindrical body includes a flow inlet on the outer wall and first and second symmetrical flow channels which extend into the body from the flow inlet and terminate at a pair of opposite openings formed in the second end wall. A tapered end portion is in a concentric fashion with the cylindrical body. The end portion has a circumferential groove formed therein adjacent the juncture of the end portion and the cylindrical body wherein the pair of opposite openings are in fluid communication with the groove. A mating head has a body portion with a bore formed therein with an inner surface tapered to mate with the end portion of the die. The arrangement being such that molten material deposited with the flow inlet and through the symmetrical flow channels enters the groove formed in the end portion and flows within the annular space between the outer surface of the end portion and the inner surface of the mating head in a balanced and even flow to a point where the molten material coats wire being drawn through the bores of the die and mating head.