Extrusion worm for the melting of organic thermoplastics

Claim 1

EXTRUSION APPARATUS FOR THE MELTING OF SOLID FINELY DIVIDED THERMOPLASTIC MATERIAL COMPRISING AN EXTRUDER HOUSING, A MATERIAL INLET OT SAID HOUSING, A MATERIAL DISCHARGE FROM SAID HOUSING, A WORM FOR ADVANCING OF MATERIAL THROUGH THE HOUSING AND THE EXTRUSION THEREOF FROM THE DISCHARGE, HEATER MEANS FOR SUPPLYING HEAT TO THE EXTRUDER ADJACENT THE DISCHARGE THEREOF FOR THE MELTING OF THE THERMOPLASTIC MATERIAL IN THE MELTING ZONE ADJACENT THE DISCHARGE, WHEREBY MATERIAL AJACENT THE DISCHARGE IS MELTED AND MATERIAL ADACENT THE INLET IS A FINELY DIVIDED SOLID, SAID HOUSING BEING MOUNTED FOR ROTATIONAL MOVEMENT OF AT LEAST A PART THEREOF IN RESPONSE TO TORQUE IMPOSED THEREON BY THE WORKING OF THE MATERIAL BY THE WORM, MEANS RESPONSIVE TO SAID ROTATIONAL MOVEMENT AND MEANS FOR CONTROLLING THE RATE OF MATERIAL FEED TO THE DEVICE, SAID MEANS RESPONSIVE TO THE ROTATIONAL MOVEMENT BEING EFFECTIVE TO GOVERN SAID CONTROL MEANS, WHEREBY UPON VARIATION IN TORQUE IN ACCORDANCE WITH RESIDENCE TIME OF MATERIAL IN THE HOUSING, THE FEED RATE TO THE EXTRUDER CAN BE VARIED IN ACCORDANCE WITH THE RESIDENCE TIME.