Method of making foundry molds and adhesively bonded composites

Details Method of making foundry molds and adhesively bonded composites Method of making foundry molds and adhesively bonded composites

B - Operations, Transporting

22

C

6/41, 6/93

B22C 1/26 (2006.01)

Patent

CA 1143507

A B S T R A C T The present invention concerns the use of an aqueous solution of n silicate as a binder, particularly for hardening foundry molds and cores without the use of acid or other re- agents to convert the silicate into a silica gel. According to the present invention, the silicate binder is not reacted but instead is rapidly dried, preferably enough within the space of 5 seconds to 10 minutes to reduce the initial water content of the aqueous silicate solution by at least 25%. In the preferred embodiments, this is achieved by forcing air through opposed porous sides of the mold box and the green sand contained therein. The present invention is also applicable to other composite forms such as the manufacture of plywood, particle board, birquettes, and the like.

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