Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1982-04-19
1983-12-13
Hall, James R.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264122, 264127, B29C 1902
Patent
active
044204493
ABSTRACT:
A process for producing articles of polytetrafluoroethylene (PTFE) is disclosed. The process allows some of the conventional plastic fabrication techniques to be used with PTFE which until now have not been possible. The process comprises the steps of intensively mixing and thermokinetically heating PTFE resin in an enclosed container with a plurality of blades attached to arms rotating about an axis, with a blade tip speed of at least 30 meters/second, to a predetermined discharge temperature of above 370.degree. C., discharging the resin at the discharge temperature, forming the resin into a desired shape at a temperature at or below the discharge temperature, holding the resin in the desired shape above a predetermined forming temperature for a predetermined time, and cooling the resin in the desired shape.
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patent: 3087921 (1963-04-01), Mathews et al.
patent: 3262834 (1966-07-01), Abell et al.
patent: 3266738 (1966-08-01), Goeser et al.
patent: 3278661 (1966-10-01), Beck
patent: 4230615 (1980-10-01), Crocker et al.
Crocker Zenas
Wright A. Nelson
Hall James R.
Synergistics Chemicals Limited
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