Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1997-11-10
1999-01-12
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 51, 264102, B29C 4402
Patent
active
058582886
ABSTRACT:
An improved process and apparatus for molding expandable polystyrene ("EPS") beads. The process comprises the steps of: (a) introducing the beads into the mold cavity; (b) isolating the mold cavity from the ambient environment; (c) purging the mold cavity of any ambient air and moisture; (d) pulsing steam into the mold cavity among the beads to melt and fuse the beads; (e) pulsing cooling mist into the mold cavity and directly among the melted and fused beads; and (f) removing the melted and fused beads from the mold cavity. The invention also comprises an apparatus for accomplishing this process and a computer program for controlling and directing the apparatus to perform the process.
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