Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – To remove entrained material from article
Patent
1994-04-08
1996-01-23
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
To remove entrained material from article
264 63, C04B 3332
Patent
active
054863317
ABSTRACT:
A process for degreasing ceramic molded bodies containing a large quantity of paraffin wax includes a constant-temperature heating conducted for a certain period of time appropriately determined according to the size and shape of the ceramic molded bodies, at a temperature immediately below the temperature for the ceramic molded bodies to begin contraction, essentially in a low temperature region wherein the contraction occurs due to liquefaction of the paraffin wax and optionally in a high temperature region wherein the contraction occurs due to thermal decomposition of the paraffin wax. According to the process of the invention, build-up of stress in the ceramic molded bodies by heating is prevented and a temperature gradient between the surface and the inside of the molded bodies is leveled, so that crack-free molded bodies are obtained with a shortened degreasing schedule.
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patent: 4923652 (1990-05-01), Murakawa
patent: 5021208 (1991-06-01), Ludwig
Soviet Inventions Illustrated, Section Ch, Week C42, Nov. 26, 1980, Derwent Publications Ltd.
Derwent Accession No. 87-139 575, Questel Telesystems (WPIL), Derwent Publications Ltd.
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Adachi Masakazu
Imao Kouichi
Derrington James
NGK Insulators Ltd.
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