APPARATUS AND METHOD FOR REPROCESSING PLASTICS

摘要

A plastics extruder for re-processing solid plastics material has an auger with a blade (61) located inside a closely fitting housing (79). Rotation of the blade advances plastics material from an inlet portion (57) to an outlet end (59) of the auger. The auger blade includes a helical screw (63) with a compression portion at which the volume between adjacent turns of the helical screw successively reduces in a direction toward the outlet end of the auger. The solid plastics material being advanced through the compression portion is heated and converted to a viscous liquid which is extruded through an extrusion nozzle connected to the outlet end of the auger. The volume reduction along the compression portion may be achieved by decreasing the outer diameter of the helical screw and maintaining the close fit of the housing (79), and/or by increasing the diameter of the auger shaft (65), and/or by reducing the pitch of the helical screw. A laminator using a plurality of the extruders produces a multilayered extrusion.