Expanded polystyrene mold for producing parts with smooth...

Details Expanded polystyrene mold for producing parts with smooth... Expanded polystyrene mold for producing parts with smooth...

B - Operations, Transporting

29

C

18/668

B29C 67/20 (2006.01) B29C 33/00 (2006.01) B29C 33/02 (2006.01)

Patent

CA 1222856

ABSTRACT OF THE DISCLOSURE A mold for use in heat expanding prefoamed polystyrene beads to form a part of a predetermined shape is disclosed. The mold comprises a cavity defined by separable mold wall portions. Each mold wall portion has on its exterior a chamber into which a heating medium is introduced to heat the mold walls and also into which cooling medium is introduced to cool the walls. A plurality of nozzles are provided in the mold walls and a corresponding plurality of flexible tubes interconnect the nozzles to a manifold located in the corresponding chamber. A pressurized heating medium is introduced to the manifold whereby the heating medium is injected into the cavity to expand prefoamed polystyrene beads in the cavity. The mold construction provides for an economical, readily manufactured unit.

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