Press forming process and apparatus for plastic foam and plastic

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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264285, 264313, 264316, 264321, 264322, 264DIG65, 264DIG66, 425340, 425364R, 425367, 425373, 425DIG39, 425DIG131, 428 71, 521 79, B29C 6722, B29C 5108, B29C 5304

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048853178

ABSTRACT:
Polymerized foam material in flat billet form is enclosed in a heat-retaining envelope and heated to forming temperature then promptly loaded into an innovative unheated forming press and accurately formed before cooling below forming temperature. The heat-retaining envelope has an expansive skin on one side and a contractive skin on the other side to facilitate bending without wrinkling or other distortion. The forming press utilizes a rigid male form punch and a spring-tensioned elastic belt, supported on a pair of variably-spaced rollers, initially presenting a flat compliant surface upon which the heated workpiece is placed. Pressure from the form punch progressively deflects the workpiece and the belt, which becomes a compliant mold member conforming itself and the workpiece progressively around the form punch to yield an article of required carved shape, free of wrinkles or tool creep distortions.

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