Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – With carbonizing – then adding carbonizable material and...
Patent
1977-06-01
1978-11-14
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
With carbonizing, then adding carbonizable material and...
201 25, 201 25, 260 23, 264 80, 264 83, 264347, 264DIG69, C01B 3102, B29H 1900
Patent
active
041255780
ABSTRACT:
Vulcanized rubber is reclaimed by treating pieces of the rubber to render a surface layer of each piece plastic while the inner core of the piece remains non-plastic. A chemical reagent can be used in the treatment, but it is preferred to render the surface layers of the rubber pieces plastic by a heat treatment which involves direct exposure of the pieces of rubber to either a flame or a heated gas. In a preferred embodiment of the invention vulcanized rubber pieces are dropped under gravity into a flame so that any attached textile residues are burnt away simultaneously with the plasticizing of the surface layers of the pieces, and the heated pieces then enter a stream of cold air which quenches the heat treatment.
Vulcanized rubber articles made from the rubber reclaimed by the method of the invention have improved properties as compared with articles made by the conventional methods of reusing vulcanized rubber.
REFERENCES:
patent: 1963943 (1934-06-01), Gross
patent: 2648097 (1953-08-01), Kritchever
patent: 2795820 (1957-06-01), Grow et al.
patent: 3368013 (1968-02-01), Pisciotta et al.
patent: 3678016 (1972-07-01), Zimmerman et al.
patent: 3703488 (1972-11-01), Morton
patent: 3767601 (1973-10-01), Knox
patent: 4029550 (1977-06-01), Mitsui
Rubber World, 2-1970, "Downwind, Akron Stinks!", pp. 45-50.
Setech International Limited
Thurlow Jeffery R.
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