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
1991-08-08
1992-06-30
Woo, Jay H.
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
164132, 164526, 264317, 264DIG44, B22C 904, B29C 3344
Patent
active
051260891
ABSTRACT:
Sand cores are removed from metal or plastic coatings by exposing the cores to a humid atmosphere for a sufficient time to weaken the binder of the sand cores. The sand is then shaken from the casting. Metal or plastic castings with hollow passages are produced by forming a casting around the sand core bound with a suitable binder followed by exposing the casting and sand core to a humid atmosphere and then shaking the sand from the casting.
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Foundry Management and Technology; Feb., 1986, pp. 2-6.
Johnson Calvin K.
Wise Bruce E.
Acme Resin Corp.
Davis Robert B.
Woo Jay H.
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