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United States Patent 5945133
Douris , ê et al. August 31, 1999

Injection molding machine with non-intermeshing twin screw compounder feeder

Zerafati-Jahromi , Ê et al. August 31, 1999

Abstract

A compounder feeder for mixing and then injecting materials such as polymers and glass fibers into a female die mold includes first and second parallel screws which have interengaging spur gears and external mixing discs, the mixing discs of one screw not engaging the mixing discs of the second screw, a drive motor for rotating the first screw and a drive cylinder for moving the second screw axially toward and away from the female die mold to inject mixed material directly therein.