Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Differential temperature conditioning
Patent
1985-05-23
1986-04-22
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Differential temperature conditioning
264547, 264549, 264293, 264296, B29C 5110, B29C 5902
Patent
active
045841578
ABSTRACT:
A method for double-side thermoforming opposite faces of a sheet of plastic is set forth. The method includes heating the sheet to a temperature within its transition range and forming one face of the sheet into the desired pattern by bringing a contour-forming first surface into contact with the face. After contact has been made, a pressure differential is imposed to cause the one face to be formed by and freeze-off to the contour of the first surface. After one face of the sheet has been formed, a second contour-forming surface is positioned adjacent to the other face of the plastic sheet. Producing a pressure differential between the opposite faces of the plastic sheet causes the other face to be formed by and freeze-off into the desired pattern imposed by the second contour-forming surface resulting in the desired plastic part. The present invention also includes a plastic part fashioned according to the aforesaid method.
REFERENCES:
patent: 2990581 (1961-07-01), Rowe
patent: 3074110 (1963-01-01), Mard et al.
patent: 3337664 (1967-08-01), Lyon
patent: 3487139 (1969-12-01), Mojonnier et al.
patent: 3535740 (1970-10-01), Frowde
patent: 3606063 (1971-09-01), Childs
patent: 3651185 (1972-03-01), Menkel
Arrem Plastics Inc.
Silbaugh Jan
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