Process and apparatus for making a molded article from expandabl

Details Process and apparatus for making a molded article from expandabl Process and apparatus for making a molded article from expandabl

1989-04-07

1991-08-06

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG10, 425 4R, B29C 6722

Patent

active

050375920

ABSTRACT:
To make a molded article from expandable synthetic resin particles, especially polystyrene particles, the cooling of the individual mold wall portions is effected exclusively by evaporating condensate obtained from stream, advantageously condensate which accumulates in stream compartments on the exterior or back sides of the mold walls which was fed in for heating of the mold wall portions and fusing the synthetic resin particles. This evaporation of condensate is effected on the back surfaces of the mold wall portions facing the steam compartments because of a low pressure or suction produced in the steam compartments. The condensate is fed in hot at or just below the boiling temperature of the condensate. Surfaces of the mold wall portions facing the steam compartment have increased surface area by reason of spherical surface-area increasing elements which form constricted passages between a plurality of interior reservoir cavities and the outside steam compartment.

REFERENCES:
patent: 2954589 (1960-10-01), Brown
patent: 3156015 (1964-11-01), Harrison
patent: 3253064 (1966-05-01), Buonaiuto
patent: 3273873 (1966-09-01), Stanchel
patent: 3452124 (1969-06-01), Knapp
patent: 3704081 (1972-11-01), Immel
patent: 3801244 (1974-04-01), Eisenberg
patent: 3837769 (1974-09-01), Erlenbach
patent: 3963816 (1976-06-01), Smith
patent: 4233006 (1980-11-01), Panas
patent: 4327045 (1982-04-01), Nishikawa et al.

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