Patent ID: 7615175
Filing Date: 2009-11-10
Classification: B05C,B29C,Y10T

Abstract:
1. A method for extruding comprising: disposing a shim having a varying thickness profile in a die, between a first die portion having a first surface and a second die portion having a second surface, the shim being positioned across the entire width of the die but not extending into the passage in the die through which extrudate passes beyond the first and second die portions, so as to form a slot between the first surface and the second surface, the slot having a varying height dimension, which substantially corresponds to the shim profile, said shim profile being selected from incrementally thicker approaching the middle of the width dimension, incrementally thinner approaching the middle of the width dimension, and incrementally increasing in thickness along the width dimension; and extruding flowable material through the slot; to obtain extrudate having substantially uniform thickness.