Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1986-11-06
1989-05-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
210741, 210780, 264 401, 264141, 264169, 2641761, 425185, 425190, B29C 4792
Patent
active
048328820
ABSTRACT:
A waste recovery method for producing essentially pure thermoplastic material from waste thermoplastic material containing impurities is disclosed to be comprised of an extruder, primary and secondary filtes, and a pelletizer. In addition, a plurality of pressure sensors are provided at several points within the system for measuring the pressure of a flow of molten thermoplastic material therethrough. A microcomputer is coupled to the pressure sensors for determining the pressure sensed by each, the microcomputer further being coupled to a plotter for plotting the pressures. An operator, by observing a rise in the plotted pressures, is enabled to activate a filter changing system in order to replace a clogged filter with a clean filter when the pressure equals a predetermined critical pressure point indicative of a filter being substantially clogged with impurities. Thus, the impurities held by a filter are not dislodged and forced to pass through the filter due to the pressure exceeding the critical pressure point.
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Lorin Hubert C.
Silbaugh Jan H.
Synthetics International Corp.
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