B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/745
B29C 59/04 (2006.01) B29B 17/00 (2006.01) B29C 47/60 (2006.01) B29C 47/68 (2006.01) B29C 47/00 (2006.01)
Patent
CA 1133216
ABSTRACT OF THE DISCLOSURE A continuous process is provided for the extrusion of molten waste polyvinyl chloride material for producing embossed articles, e.g., automotive mats or runners, from waste thermoplastic material, e.g., reclaimed polyvinyl chloride. The process includes (a) continuously feed- ing solid waste polyvinyl chloride into the inlet of a milling and melting machine and continuously removing molten waste polyvinyl chloride through an outlet channel having an infeed end and an outfeed end, the outlet channel surrounding a screw extruder mechanism; (b) continuously impelling the molten waste polyvinyl chloride material through the outlet channel by means of rotation of the screw extruder from the infeed end and through an outlet aperture in the screw extruder at the outfeed end of the outlet channel; (c) placing a continuously movable segmented screen changer in the outlet channel across the path of the impelled molten waste polyvinyl chloride; (d) continuously filtering the impelled molten waste polyvinyl chloride material through clean portions of the segmented screen changer as the segmented screen changer moves continuously across the path of im- pelled movement of the molten waste polyvinyl chloride material; (e) placing an extrusion die in the outlet channel downstream from the segmen- ted screen changer; and (f) continuously extruding the filtered waste polyvinyl chloride material as a filtered molten mass through the die. Preferably the process includes the step of (g) continuously drawing the extruded filtered molten mass between a pair of embossing rollers; thereby continuously producing the embossed articles. This process is at least ten times as fast as the conventional compression molding technique, and uses waste polyvinyl chloride efficiently and effectively.
341687
Marcus & Associates
Rosenfeld John J.
LandOfFree
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