Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1981-11-20
1982-11-16
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 17, 264 406, 264 407, 26432816, 425812, 425DIG11, B29C 500, B29F 108
Patent
active
043594352
ABSTRACT:
A method of producing resin articles by use of a plaster mold in which the resin injection pressure in the plaster mold is sensed by a pressure sensing means to control the injection conditions for a molding machine in accordance with the desired injection speed, injection pressure, and holding time, as determined by the size and shape of the article being molded and the diameters of a sprue runner and an air vent. Heating and cooling pipes may optionally be embedded in the plaster to accelerate the setting of the resin in any thick portions while maintaining the resin in the sprue runner position of the mold sufficiently fluid so that additional resin may still be injected into the mold to compensate for any shrinkage. The molded products may be dental prosthetic goods of intricate shape and having increased strength and improved dimensional accuracy compared to those fabricated by previous methods.
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