Device for the plastication of powdery plastic materials

Abstract

Abstract A DEVICE FOR THE PRESSURELESS PLASTICATION OF POWDERY PLASTIC MATERIALS, WHICH CAN BE USED IN FRONT OF A CONVENTIONAL SINGLE SCREW EXTRUDER, AND WHICH INCLUDES TWO AXIALLY PARALLEL SCREWS, LOCATED IN A HOUSING AND HAVING AN ESSENTIALLY IDENTICAL FLIGHT GRADIENT, WHICH ALMOST COMPLETELY ENGAGE INTO EACH OTHER AND CAN BE ROTATED IN THE SAME DIRECTION. EACH SCREW IS SHAPED TO PROVIDE SEALING RIDGES WHICH CLOSE THE CONVENTIONAL SCREW THREADS AND WHICH ENGAGE WITH CORRESPONDINGLY SHAPED PASSAGEWAYS PROVIDED IN THE FLIGHTS OF THE ADJACENT SCREW, WHEREBY THE PLASTICATION CAN BE CARRIED OUT WITH ONLY PARTIALLY FILLED SCREW THREADS, AND A CONSTANT SEALING ENGAGEMENT OF THE SCREWS IS INSURED. THE TRAPPED AIR AND THE DEVELOPING GASES CAN ESCAPE THROUGH VAPOR OUTLETS PROVIDED IN THE HOUSING.

Inventors

• 👤 Rudolf Paul Fritsch

Bibliographic Details