Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including both heating and cooling means
Patent
1978-08-24
1981-03-24
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including both heating and cooling means
425 74, 4253871, 425388, B29C 1704
Patent
active
042577560
ABSTRACT:
An apparatus provided for forming articles from thermoplastics sheet by free-blowing, without use of moulds, in which the sheet is pre-heated to elastic state, free-blown by establishing a differential fluid pressure between opposite faces of the sheet and maintained at optimum temperature during the period of free-blowing by heating or cooling by heat-exchange between the sheet and fluid flowing over at least one face. The apparatus comprises a tank divisible into two halves adapted to hold the sheet edgewise in between, the differential fluid pressures being established between the volumes in the two halves and fluid flow over the face of the sheet being established in one half.
REFERENCES:
patent: 2931064 (1960-04-01), Matoba
patent: 3007206 (1961-11-01), Griswold
patent: 3482281 (1969-12-01), Thiel
patent: 3529458 (1970-09-01), Butler et al.
Redifon Flight Simulation Limited
Silbaugh Jan H.
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