Patent ID: 9120262
Filing Date: 2015-09-01
Classification: B29C,B29D,B29K,B29L

Abstract:
1. An apparatus for extruding a polymeric material, comprising an extrusion head which comprises: a male die; a female die coaxially arranged with respect to said male die, wherein one die of said male die and said female die is axial displaceable with respect to the other die along an axial direction of said extrusion head; a conveying channel, at least one portion of which is defined between said male die and said female die; and a device for adjusting a cross-sectional area of said at least one portion of said conveying channel by reciprocally displacing said axially displaceable die with respect to the other die in response to an extrusion speed variation of said polymeric material; a resilient element for passively displacing said axially displaceable die with respect to the other die along said axial direction by a spring force; wherein the magnitude of the spring force is substantially equal to a force exerted by the polymeric material acting on the axially displaceable die.