Apparatus for making a corrugation-free foam

Details Apparatus for making a corrugation-free foam Apparatus for making a corrugation-free foam

2006-11-28

2006-11-28

Smith, Duane (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

C425S377000, C425S380000

Reexamination Certificate

active

07140865

ABSTRACT:
A method and apparatus for extruding a corrugation-free polystyrene foam with 100% carbon dioxide as the blowing agent by extruding the extrudate through an annular die opening so that it contacts a choke ring inner surface. A foam made with the apparatus according to the invention will have no visible corrugations and an average cell size of less than 0.35 mm.

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