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United States Patent 4798472
Douris , ê et al. January 17, 1989

Extruder screw with balanced flights of different functional sections

Chan , Ê et al. January 17, 1989

Abstract

A plasticating extruder with a screw having a feed section, a transition section, a metering section, a first primary flight located substantially in the first two sections, a second primary flight located substantially in the last two sections and two corresponding secondary flights located in the transition section, all the flights in the latter section radially balancing each other, and the first primary flight in the feed section balancing radially the second primary flight in the metering section. In another embodiment, the screw can in addition have a mixing section and another metering section, the latter having a flight balancing radially other flights in other sections.