Patent ID: 8231374
Filing Date: 2012-07-31
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 at an outlet of the perpendicular portion; and a thickness of at least one of the discs in the flow direction is about one inch or less, wherein the outlets defined by the polymer extrusion channels of the first and second and second and third discs abut.