Removing volatiles from plastic materials delivered to an extrus

Details Removing volatiles from plastic materials delivered to an extrus Removing volatiles from plastic materials delivered to an extrus

1982-03-16

1987-01-13

Derrington, James

Agitating

Rubber or heavy plastic working

With specified feed means

264 401, 264101, 264102, 366 79, 366139, B28C 704

Patent

active

046360840

ABSTRACT:
A device is described which eliminates the pre-drying of particulate plastic prior to processing by an extrusion or injection molding machine. A tubular guide member directs particulate plastic under gravity into the feed inlet of the machine. During delivery, the temperature of the particulate plastic is raised with heated air flows to between about 150.degree.-200.degree. F. Suction is applied to the feed inlet of the machine to remove volatiles (primarily water) released when the temperature of the particulate plastic is increased by contact with the heated barrel and screw-drive of a machine. Temperature and suction controls permit selection of operating temperature and suction levels that ensure removal of volatiles prior to any extensive plasticization and transfer along the barrel which would otherwise preclude proper removal of volatiles.

REFERENCES:
patent: 759527 (1904-05-01), Irwin
patent: 3163888 (1965-01-01), Shattuck
patent: 3335462 (1967-08-01), Grigull et al.
patent: 3563514 (1971-02-01), Shattuck
patent: 3655313 (1972-04-01), Kunogi
patent: 3826477 (1974-07-01), Kunogi et al.
patent: 4191726 (1980-03-01), Stillhard
Meiki Co., Ltd. brochure entitled, "M-Series Injection Molding Machine", No. C-320B 83. 8. 700A.
Plastics Technology, Preheating Thermoplastic Materials, Leiske, Roy R., In India Rubber World, Nov. 1947, p. 227.

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