B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/657
B29C 44/30 (2006.01) B29C 44/20 (2006.01)
Patent
CA 1212212
ABSTRACT OF DISCLOSURE 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.
435018
Berner Rolf E.
Borden Ladner Gervais Llp
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