Patent ID: 6322347
Filing Date: 2001-11-27
Classification: B29C,B29K

Abstract:
A system for processing polymeric material operable to cyclically inject polymeric material into a mold or to cyclically eject polymeric material from a die comprising:a barrel having an upstream direction and a downstream direction;a polymer processing screw constructed and arranged to rotate within the barrel to convey polymeric material in a downstream direction within a polymer processing space defined by the barrel and the screw;a blowing agent port connecting to the polymer processing space and positioned to introduce a blowing agent into polymeric material in the polymer processing space to allow formation therein of a solution of polymer and blowing agent; anda restriction element positioned within the polymer processing space upstream of the blowing agent port that restricts the upstream flow of polymeric material within the barrel during at least a portion of an injection or an ejection cycle.