Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1982-11-12
1984-05-08
Lowe, James B.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
425394, 425DIG48, B29C 1700
Patent
active
044472005
ABSTRACT:
Apparatus for molding a polycarbonate plastic sheet into a skylight dome and the like. A heated clamp frame is provided for clamping the edges of a plastic sheet and preheating the edges to about 250.degree. F. Ovens heat the clamped sheet to about 300.degree. F. to soften the plastic for forming by a pair of co-acting peripheral heated molds to form steps and pushes in the periphery of the softened sheet immediately adjacent to the clamp frames. A vacuum is then drawn over the center portion of the plastic sheet to free form a dome.
REFERENCES:
patent: 2444420 (1948-07-01), Borkland
patent: 2784455 (1957-03-01), Pulaski
patent: 3025566 (1962-03-01), Kostus
patent: 3632275 (1972-01-01), Misner
patent: 3841819 (1974-10-01), Diamond
patent: 3910747 (1975-10-01), Dean
patent: 3953273 (1976-04-01), Faller
patent: 4127378 (1978-11-01), Meadows
patent: 4170449 (1979-10-01), Shuman
patent: 4278414 (1981-07-01), Weisner et al.
"Heat-Forming Techniques for Plastic Sheet", Kostus, Product Engineering, Mid-Sep. 1960, pp. 164-169.
Walls, Jr. Lester L.
Weisner Kent A.
Kenergy Corporation
Lowe James B.
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