Patent ID: 8939751
Filing Date: 2015-01-27
Classification: B23C,B29C,Y10T

Abstract:
1. An annular die comprising: a mandrel having a surface; a spiral groove formed in the mandrel surface, the spiral groove having a length with opposite proximal and distal ends where the spiral groove proximal end receives a liquid flow and the spiral groove length directs the liquid flow from the proximal end of the spiral groove toward the distal end of the spiral groove and thereby distributes the flow of liquid across the mandrel surface and directs the flow of liquid in a flow direction across the spiral groove and across the mandrel surface; and at least a portion of the spiral groove having a cross-section configuration with a bottom surface, a first side surface and a second side surface, the second side surface is located on an opposite side of the bottom surface from the first side surface, the bottom surface has a u-shaped configuration and the first side surface curves toward the flow direction as the first side surface extends from the bottom surface to the mandrel surface and intersects with the mandrel surface.