Shear processing thermoplastics in the presence of ultrasonic vi

Details Shear processing thermoplastics in the presence of ultrasonic vi Shear processing thermoplastics in the presence of ultrasonic vi

1987-08-17

1988-12-27

Bleutge, John C.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 70, 264108, 524577, 524582, 524585, B29C 4712

Patent

active

047939540

ABSTRACT:
Various processing advantages are gained when ultrasonic vibration is applied to a thermoplastic processing apparatus such as an extruder or an injection molding device. Such advantages include improved flow rate, reduced processing pressure, and consequently reduced processing temperature to mold or extrude the melted thermoplastic. The ultrasonic vibration is desirably applied to the die of the processing apparatus and in a direction longitudinal to the flow of the thermoplastic. Suitable thermoplastics include polystyrene and polyolefins.

REFERENCES:
patent: 3071809 (1963-01-01), Lerch
patent: 3194855 (1965-07-01), Jones
patent: 3233012 (1966-02-01), Bodine
patent: 3619429 (1971-11-01), Torigai

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