ApplicationNo. 537975 filed on 01/02/1975
US Classes:425/382.4, Including restriction upstream of shaping orifice and downstream of primary pressurizing means264/176.1, Shaping by extrusion264/177.1, To produce particular cross section (e.g., noncircular, etc.)425/461, MEANS PROVIDING A SHAPING ORIFICE65/183EXTRUSION DIE FORMER WITH UPSTREAM DISCHARGE ASSISTANT
ExaminersPrimary: Husar, Francis S.
Assistant: Rosenbaum, Mark
Attorney, Agent or Firm
AbstractThe present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the degree of microsurface roughness in the extruded sheet.