B - Operations – Transporting – 29 – H
Patent
B - Operations, Transporting
29
H
18/731
B29H 19/00 (1980.01)
Patent
CA 1038572
ABSTRACT OF THE DISCLOSURE: Polymeric scrap material, such as rubber from used vehicular tires, is reclaimed by commenting the scrap and then advancing it under substantially atmospheric pressure through a heating chamber with the aid of two or more heated feed screws having interleaved threads, one screw rotating at half -the speed of its neighbor and having a double thread with twice the pitch of the single thread of the latter. Residence time in the hea- ting chamber may range between 3 and 30 minutes, at operating temperature of 140° to 300°C. By relatively accelerating or retarding one of two adjoining screws, their interleaved threads are moved into a nearly contacting relationship in which they scrape adhering incrustations from each other.
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