Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1984-11-21
1986-11-18
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264327, 264DIG60, B29C 3900, B29C 4118
Patent
active
046235035
ABSTRACT:
A method wherein an article is molded of a heat-fusing material or plastisol, either liquid or dry, in a mold having an array of gas impingement jets disposed adjacent the backside of a mold surface for controlling the temperature over respective first and second areas of the mold surface. There is included first and second gas heating and cooling circuits each including a blower and dampers for supplying gas at the gas impingement jets associated with the mold. All of the gas impingement jets are supplied with heated gas to preheat the mold surface to a non-gelling temperature and a liquid plastisol coating is applied to the mold surface. To obtain the coating, the mold is filled and the excess plastisol is removed from the mold by dumping the plastisol from the mold into a dump tank. In a liquid plastisol process, a first group of gas jets arranged in close proximity to the mold maintain a temperature higher than the temperature of the liquid in the first area of the mold to a higher temperature than the second area.
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Anestis Emmanuel
Wakefield Frederick I.
Evans John C.
Ex-Cell-O Corporation
Hoag Willard E.
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