MIXING AND COOLING APPARATUS FOR USING A SCREW EXTRUSION FOR THERMOPLASTIC FOAM MATERIALS.

摘要

A mixer-cooler device for the extrusion of thermoplastic foams comprising: a pair of radially foraminous tubular cylindrical blocks, clamped in axial alignment against opposite faces of a barrier disk by means of a headplate for connection with an extruder barrel and a headplate for connection with an extrusion head, the disk having an axial circular aperture; an advancement screw sealingly rotatable within the blocks, connectable with a screw of the extruder to constitute an extension of this latter screw, the advancement screw having an intermediate barrier section sealingly rotatable in the aperture of the disk; a tubular casing sealingly connecting the two headplates to form a tubular collector channel embracing from the outside the foraminous zones of the two blocks; and a system of passages in the headplates, blocks and disk for the circulation of a coolant liquid for the two blocks.