Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By impinging or atomizing with gaseous jet or blast
Patent
1998-07-07
2000-11-07
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By impinging or atomizing with gaseous jet or blast
264141, B28B 910
Patent
active
061432121
ABSTRACT:
A super-low temperature plastic powder manufacturing method for continuous production of thermo-plastic powder with granule sizes smaller than 10 microns. The method includes the steps of material melting wherein coarse granular thermo-plastic material is melted to form a plastic solution, high air pressure blowing for separation wherein high pressure air is injected to impact the plastic solution to cool and harden it gradually into micro-granules and to thereby reduce its adhesive strength, super-low temperature liquid nitrogen impacting for brittling wherein super low temperature liquid nitrogen is used to reduce the temperature of the plastic micro-granules, and low temperature calendaring. The reduced temperature greatly reduces elongation, impact strength, and fracture resistance of the plastic micro-granules for easier processing.
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patent: 3719733 (1973-03-01), Rakestraw et al.
patent: 4822267 (1989-04-01), Walz
patent: 5196049 (1993-03-01), Coombs et al.
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