Machine for the production of molded parts from foamed plastic

Details Machine for the production of molded parts from foamed plastic Machine for the production of molded parts from foamed plastic

1986-06-17

1987-08-11

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

264 403, 264 41, 264 50, 264 51, 425145, 425146, 425149, B29C 6720

Patent

active

046858725

ABSTRACT:
An improved machine for the production of foamed plastic molded parts, including soft foam plastics, i.e. for processing particles without foaming capacity, and including the processing of greatly frothed plastic foam particles, i.e. particles with but little foaming capacity, is obtained in that a pressure equalization system is provided which creates virtually equal pressure conditions while the mold cavity is being filled, i.e. the same overpressure in the material supply line as in the mold cavity. This makes it possible to introduce the foam particles, already compressed in the material supply system, into the mold cavity in a continuous flow by means of an injector, with excess foam particles being blown back into a tank provided in the material supply system by the injector after the mold cavity is filled. Due to this operating principle, the machine can be designed so that it can be set up for the processing of different materials such as soft foam particles, rigid foam particles and greatly expanded rigid foam particles.

REFERENCES:
patent: 3676033 (1972-07-01), Buonaiuto
patent: 3692442 (1972-09-01), Gerbert
patent: 3926219 (1975-12-01), Ersfeld et al.
patent: 4327045 (1982-04-01), Nishikawa et al.
patent: 4381272 (1983-04-01), Ehritt
patent: 4390332 (1983-06-01), Hendry
patent: 4399105 (1983-08-01), Tilgner et al.
patent: 4474717 (1984-10-01), Hendry

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