Method of generating pressure in a press and circuit for carryin

Details Method of generating pressure in a press and circuit for carryin Method of generating pressure in a press and circuit for carryin

1978-06-07

1980-06-10

Parrish, John A.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425149, B29C 306

Patent

active

042070473

ABSTRACT:
A method for pressure buildup in a pressing cylinder of a press for a plastic or elastic material, wherein the material, under the influence of the advance of a plunger, is initially precompressed slowly to reach a pre-extrusion pressure and then the pressure is raised and adjusted to the extrusion pressure for the material and maintained at this level. The differential quotient of the pressure rise as a function of time is predetermined as a criterion for reaching the pre-extrusion pressure, and compression is carried out up to this point at a constant low plunger advance rate, with a constant rise in pressure thereafter up to the extrusion pressure.
A circuit for carrying out the method includes at least one valve incorporated in the hydraulic feed line to the hydraulic cylinder in which the piston is positioned. The valve is controllable initially by a volume sensor and then by a pressure-rise control means for the hydraulic fluid. A controlled controller-reverser is provided, which is connected downstream from a pressure-differential quotient converter connected to the hydraulic cylinder through a threshold value circuit.

REFERENCES:
patent: 3299476 (1967-01-01), McIlvin
patent: 3379143 (1968-04-01), Kelley
patent: 3616495 (1971-11-01), Lemelson
patent: 3661483 (1972-05-01), Bose
patent: 3693946 (1972-09-01), Merritt
patent: 3721512 (1973-03-01), Ma et al.
patent: 3820928 (1974-06-01), Lemelson
patent: 3893792 (1975-07-01), Laczko
patent: 3894824 (1975-07-01), Wells

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