Apparatus for processing plastic materials

Abstract

Abstract AN APPARATUS FOR EXTRUDING, INJECTION MOLDING, BLOW MOLDING AND TRANSFER MOLDING PLASTIC MATERIALS COMPRISE A FEED SCREW PRESSING PLASTIC MATERIAL OVER A ROTOR WITH A DIAMETER WHICH FIRST INCREASES IN ORDER TO MILL AND SHEAR THE MATERIAL OVER A SPREADING CIRCUMFERENCE, AND THEN DECREASES IN ORDER TO WORK AND STRETCH THE PLASTIC MATERIAL CENTRIPETALLY. THE FEED SCREW IS CLOSELY SURROUNDED BY A BARREL, AND THE ROTOR BY A FIRST AND A SECOND HOUSING ENDING IN A DISCHARGE OPENING, THROUGH WHICH A FLIGHTED SCREW EXTENDS IN A CLOSELY SURROUNDING CYLINDER. THE FLIGHTED SCREW IS FIRMLY ATTACHED TO THE END OF THE ROTOR FOR EXTRUSION OPERATION. FOR INJECTION MOLDING, THE FLIGHTED SCREW IS MOUNTED FOR AXIAL AND ROTATIONAL MOVEMENT THROUGH A BORE IN THE ROTOR. FOR PISTON INJECTION MOLDING, A PISTON EXTENDS THROUGH THE BORE OF THE ROTOR. THE GENERATICES OF THE ROTOR AND HOUSING SURFACES FORM ACUTE ANGLES BETWEEN OPPOSITE PROXIMATE SECTIONS OF THESE SURFACES, CORRESPONDING TO THE REQUIREMENTS OF DIFFERENT PLASTIC MATERRIALS. ROTOR AND HOUSING SURFACES ARE PROVIDED WITH PROTRUSIONS TO ACHIEVE SPECIFIC PROCESSING TASKS. AN OPENING IN THE HOUSING NEAR THE MAXIMUM ROTOR SURFACE SERVES TO DEVOLATILIZE GASES AND VAPORS. ROTOR AND HOUSING ARE AXIALLY MOVABLE TO EACH OTHER, TO VARY AND CONTROL THE PROCESSING SPACES THEREBETWEEN.

Inventors

• 👤 Hans A Eckhardt

Bibliographic Details