Machine for the continuous molding of polystyrene

Details Machine for the continuous molding of polystyrene Machine for the continuous molding of polystyrene

1982-08-20

1984-02-21

Anderson, Philip E.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

264 51, 264338, B29D 2700

Patent

active

044327137

ABSTRACT:
An improved machine for the continuous molding of polystyrene is described in which granules of polystyrene containing a heat-activated expansion agent are converted into a coherent agglutinated body. The machine includes an open ended molding chamber having an inlet end and an outlet end. The pre-expanded polystyrene granules enter the molding chamber through the inlet end of the molding chamber and continuously move through the chamber. As the polystyrene granules move through the chamber they are subjected to heat to cause their expansion. The improved molding chamber includes interior wall surface portions that operate to limit the expansion of the polystyrene granules in order to produce a dimensionally stable cross section in the agglutinated body. At least a portion of the interior wall surface portions are stationary. The polystyrene granules are moved continuously through the molding chamber by apparatus that includes at least one belt in contact with the moving polystyrene having a working segment spanning the inlet and outlet ends of the molding chamber. The apparatus associated with the stationary wall surface portion is adapted to permit free sliding movement of the agglutinated body through the molding chamber.

REFERENCES:
patent: Re27964 (1974-04-01), Berner
patent: 3383441 (1968-05-01), Norrhede et al.
patent: 3408690 (1968-11-01), Jacob
patent: 3422178 (1969-01-01), Junker et al.
patent: 3594461 (1971-07-01), Jacob
patent: 3971838 (1976-07-01), Yazawa
patent: 3986918 (1976-10-01), Berner

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