Method of embossing foam polystyrene to prevent warping upon rem

Details Method of embossing foam polystyrene to prevent warping upon rem Method of embossing foam polystyrene to prevent warping upon rem

1975-01-06

1977-10-11

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Deforming the surface only

264296, 264321, B29B 300, B29F 500

Patent

active

040535495

ABSTRACT:
A method is provided for thermoforming thermoplastic foam articles whereby the tendency for such articles to deform and/or warp immediately upon release from the thermoforming device is eliminated. The method includes the formation of parallel or concentric grooves on one surface of the article during the course of the thermoforming operation. Such grooves eliminate the pronounced tendency of thermoformed articles to curl up following their removal from the thermoforming mold and maintains the formed piece in the desired flat configuration.

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Dorian, "Six-Language Dictionary of Plastics...", Iliffe Books, London, 1965, p. 582.

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