Home >> Patent Categories

Patents

Patent Search

United States Patent 3942774
Douris , ê et al. March 9, 1976

Method of and means for effecting redistributive mixing in an extruder

Sokolow March 9, 1976

Abstract

Redistributive mixing is effected in an extruder wherein the extruder screw advances thermoplastic material toward and through transfer grooves in a corotative torpedo. The torpedo grooves progressively diminish in cross sectional flow area from inlet ends at the upstream end of the torpedo toward downstream ends running out adjacent to the torpedo tip. Feeder grooves in a complementary passage wall of a stationary discharge head adapter in which the torpedo operates, receive the thermoplastic material transferred and propelled with redistributive mixing action from the torpedo grooves. The passage wall grooves have upstream entry ends aligned with the upstream ends of the torpedo grooves and extend therefrom in progressively increasing cross sectional flow area to downstream ends feeding toward an outlet.