Molding prepuffed polystyrene for higher density skin

Details Molding prepuffed polystyrene for higher density skin Molding prepuffed polystyrene for higher density skin

1981-10-16

1984-01-03

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 454, 264 455, 264 51, 425 4R, B29D 2700, B05D 106

Patent

active

044241771

ABSTRACT:
An article having a relatively lower density polystyrene core and a relatively higher density polystyrene skin is prepared by a method in which a mold is supplied, simultaneously and/or sequentially with electrostatically charged prepuffs of a relatively higher density polystyrene and relatively uncharged low density prepuffs. The walls of the metal mold preferentially attract the electrostatically charged particles. The uncharged lower density prepuffs concentrate at the core. The thus filled mold is subjected to the heating and cooling cycle to provide a molded article having a core with a lower density than the skin.

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