Method and apparatus for forming a flexible thermoplastic resin

Details Method and apparatus for forming a flexible thermoplastic resin Method and apparatus for forming a flexible thermoplastic resin

1982-08-16

1985-06-18

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264321, 4251748E, 425398, 425817R, B29D 2700

Patent

active

045240370

ABSTRACT:
A process and associated apparatus for forming a foam plastic article using a mold with a mold cavity and a pair of electrodes across which an RF field may be impressed. The foam material that is to be processed is inserted into the mold and is then compressed. The compression may be at least on the ratio of 2 to 1 and perhaps as high or higher than 8:1. An RF heating field is applied while maintaining the foam material compressed and after the heat is terminated, the foam material is permitted to expand to conform to a mold shape as the material cools. This pre-compression step enables substantial reduction in processing time.

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