Patent ID: 7980841
Filing Date: 2011-07-19
Classification: B29C,B29K,B29L

Abstract:
1. A pipe extrusion die apparatus comprising: a straight mandrel section comprising: an inlet flow passageway disposed in fluid communication with the inner and outer flow passageways; a ratio defining section disposed at an upstream end of the straight mandrel section, the ratio defining section having a ratio adjusting tube substantially concentric with, and configured to translate axially along an inner surface of, the inner flow passageway, the ratio adjusting tube having a tapered face movably disposed between being contiguous with the inner surface and being in blocking engagement between the inlet flow passageway and the inner flow passageway; and an outlet section disposed at a downstream end of the straight mandrel section, the outlet section having an inner flow passageway outlet and an outer flow passageway outlet.