Apparatus for thermoforming thermoplastic sheet materials

Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...

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Details

264522, 425388, 425403, B29C 1704, B29C 1703

Patent

active

045002770

ABSTRACT:
The present invention relates to an improved plug or tool for use in the production of shaped articles from thermoplastic sheet materials. An important feature of the present invention is that the tool or plug comprises a body portion which incorporates one or more inserts which possess a thermal conductivity different from the thermal conductivity of the body portion.

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patent: 3521849 (1970-07-01), Voss
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patent: 3612158 (1963-10-01), Rossi
patent: 3734449 (1973-05-01), Itou
patent: 3901640 (1975-08-01), Tigner
patent: 4039271 (1977-08-01), Hudson
patent: 4039609 (1977-08-01), Thiel et al.
patent: 4085177 (1978-04-01), Sauer

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