Roll compacting of polymer powders into fully dense products

Details Roll compacting of polymer powders into fully dense products Roll compacting of polymer powders into fully dense products

1981-11-12

1984-03-13

Hall, James R.

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

Continuously formed or indefinite length article

264123, 264126, 264291, B28B 108

Patent

active

044366825

ABSTRACT:
A flowable thermoplastic polymer powder is fed to the nip of a pair of cooperatively rotating compression rolls whereupon the polymer feed is passed between the rolls which compact and cause the particles to coalesce into a shaped article which thereupon emerges from between the rolls in the form of a sheet or film. During the operation, the circumferential speed of the rolls is maintained essentially equal to the linear speed of the sheet or film exiting therefrom. The sheet or film is withdrawn from between the rolls under tension at a force which is adjusted so as not to exceed the elastic limit of the resulting sheet or film product. Flowable thermosetting polymer powder is also compacted into fully dense products by feeding the powder to the nip of a pair of cooperatively rotating compression rolls, whereupon the polymer feed is passed between rolls which compact and cause the particles to cold weld.

REFERENCES:
patent: 2067025 (1937-01-01), Schmidt
patent: 2920349 (1960-01-01), White
patent: 3285442 (1966-11-01), Tigner

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