Patent ID: 6471502
Filing Date: 2002-10-29
Classification: B29C

Abstract:
An extrusion die in which material exits the die at an annular orifice in a direction generally parallel to a central axis of the die, the die comprising:a first set of the flow channels for receiving a flow of material and for providing material to a first plurality of ports ranged around a first annular region; a second set of the flow channels for receiving the flow of material and for providing flow to a second plurality of ports arranged around a second annular region, the first and second annular regions being axially spaced from each other along the central axis, and having a configuration such that regions of greater flow in the first annular region are axially aligned with regions of lesser flow in the second annular region, and regions of lesser flow in the first annular region are axially aligned with regions of greater flow in the second set.