Patent ID: 7954991

Claim:
A materials extrusion device including a screw extruder with a plunger feeder, which comprises: a) a screw extruder having a main housing, a materials advancing screw, a screw drive mechanism, a feed port for inputting materials to be extruded and an extrusion outlet port; and, b) a plunger feeder having an elongated, upwardly biased plunger housing, a plunger positioned in said plunger housing, a plunger drive mechanism connected to said plunger to move said plunger upwardly and downwardly within said plunger housing, and a feed outlet at an upper end of said plunger housing, said feed outlet being connected to said screw extruder feed port; wherein a user may position said plunger downwardly in said plunger housing, gravity fill said housing with materials to be extruded, operate said screw extruder with said screw drive mechanism and operate said plunger drive mechanism to advance said plunger upwardly for moving said materials at a controlled rate out of said plunger housing and into said screw extruder for extrusion of said materials therefrom.