B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 33/52 (2006.01) B22C 1/16 (2006.01) B22C 1/26 (2006.01) B22C 9/10 (2006.01) B22D 29/00 (2006.01) B29C 33/76 (2006.01)
Patent
CA 2046428
ABSTRACT OF THE DISCLOSURE A method of removing a core from a molded product in which the core is formed of a particulate inert material, such as sand, bound together by a cured binder of a water soluble carbohydrate alone or mixed with a silicate is disclosed. The silicate is preferably an alkali earth metal silicate, preferably sodium silicate, and the carbohydrate is preferably a saccharide or starch. The binder is cured by heat. The core and molded product are exposed to water, preferably heated water in a bath or steam, to rapidly disintegrate the core and remove it from the molded product.
Moore Timothy M.
Van Der Woude Gerbrig W.
Advanced Plastics Partnership
Osler Hoskin & Harcourt Llp
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