Patent ID: 7713047
Filing Date: 2010-05-11
Classification: A61M,B29C,B29K,B29L,Y10T

Abstract:
1. An extrusion apparatus for making a multilayer article, the extrusion apparatus having a first end and a second end and a flow direction going from the first end to the second end, the extrusion apparatus comprising: a central mandrel having an axis; a plurality of discs where each disc surrounds the central mandrel, the plurality of discs including: wherein the plurality of discs and the central mandrel define a cylindrical flow channel, and wherein the second disc and the third disc together define a gap creating a polymer flow channel having a portion that is perpendicular to the axis of the mandrel and wherein the perpendicular portion abuts the cylindrical flow channel; and a thickness of at least one of the discs in the flow direction is about one inch or less.