Method for plasticizing and molding

Claim 1

IN A PROCESS FOR MOLDING PLASTIC MATERIAL, THE STEPS CONSISTING OF: PROVIDING A PLASTICIZING CHAMBER HAVING FIXED WALL MEANS AND SCREW MEANS ROTATABLY SUPPORTED WITHIN SAID CHAMBER AND DEFINING WITH SAID WALL MEANS A TORTUOUS PATH THERETHROUGH; FIRST AND SECOND VARIABLE VOLUME CHAMBERS COMMUNICATING WITH SAID PATH AT SPACED POINTS THEREALONG, EACH VARIABLE VOLUME CHAMBER CONTAINING A RAM MOVABLE THEREIN TO VARY THE VOLUME IN SAID VOLUME CHAMBERS; AND A MOLDING CHAMBER CONNECTABLE TO SAID PATH; PLACING PLASTIC MATERIAL IN THE FIRST VOLUME CHAMBER AND CAUSING THE RAM THEREIN TO MOVE A QUANTITY OF SAID MATERIAL FROM SAID FIRST VOLUME CHAMBER INTO SAID PATH; CAUSING ALL OF SAID QUANTITY OF MATERIAL TO MOVE IN ONE DIRECTION ALONG SAID PATH AND THENCE INTO SAID SECOND VOLUME CHAMBER; SUBJECTING SAID MATERIAL TO SIMULTANEOUS FRICTIONAL HEATING, AGITATION AND COMPRESSION AS IT MOVES ALONG SAID PATH THROUGH SAID PLASTICIZING CHAMBER TO RAISE THE TEMPERATURE AND REDUCE THE VISCOSITY OF THE MATERIAL; CAUSING THE RAM IN THE SECOND VOLUME CHAMBER TO MOVE ALL OF SAID QUANTITY OF MATERIAL FROM SAID SECOND VOLUME CHAMBER BACK INTO SAID PATH; CAUSING SAID QUANTITY OF MATERIAL TO MOVE ALONG SAID PATH IN THE OPPOSITE DIRECTION AND THENCE INTO SAID FIRST VOLUME CHAMBER, AND AGAIN SUBJECTING SAID MATERIAL TO FRICTIONAL HEATING, AGITATION AND COMPRESSION; REPEATING THE FOREGOING STEPS UNTIL SAID QUANTITY OF MATERIAL REACHES A DESIRED VISCOSITY AND TEMPERATURE FOR MOLDING; AND CONDUCTING THE QUANTITY OF PLASTIZED MATERIAL FROM SAID PATH TO SAID MOLDING CHAMBER.