Pre-expander for expandable polymer beads

Details Pre-expander for expandable polymer beads Pre-expander for expandable polymer beads

1986-03-10

1987-06-30

Yuen, Henry C.

Heating

Having operating or controlling device responding to...

432118, 432103, 361 33, 425209, 318433, F27B 940

Patent

active

046767398

ABSTRACT:
A pre-expander for polymer beads is disclosed which includes a pre-expansion chamber having an agitator therein. The agitator is driven by an electric motor. The power requirements of the motor are monitored to determine the resistance which the beads are offering to motion of the agitator. The resistance to motion increases as the beads expand. Pre-expansion is stopped when the resistance offered by the beads results in a predetermined power requirement.

REFERENCES:
patent: 3720004 (1973-03-01), Okawara
patent: 3798789 (1974-03-01), Thompson
patent: 3811822 (1974-05-01), Cherenson
patent: 4031440 (1977-06-01), Christian et al.
patent: 4060354 (1977-11-01), Smith
patent: 4112475 (1978-09-01), Stitt et al.
patent: 4118749 (1978-10-01), Matuzaki et al.

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