Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1975-12-03
1976-11-23
Spicer, Jr., Robert L.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
29200R, 264 87, 156305, 156309, 156330, 425175, 425420, 425437, 425DIG102, 425DIG119, B29C 102
Patent
active
039937275
ABSTRACT:
A fluid-releasable mold for forming shaped ware including a porous mold body comprising at least 70% alumina, up to 15% ball clay and up to 15% talc is disclosed. A mold face is formed on one surface of the mold body and fluid-permeable conduit is provided in communication with a second surface of the mold body with means for sealing the fluid-permeable conduit to the second mold body surface to prevent the escape of fluid from the conduit other than through the mold body and out the mold face. The arrangement obviates the problem of gradual loss of porosity which has heretofore limited the service life of fluid-release molds of alumina, ball clay, and talc.
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Kendall Virgil D.
Skriletz Rudolph A.
Spicer, Jr. Robert L.
Wallace-Murray Corporation
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