Molding core

Details Molding core Molding core

1992-11-23

1993-09-28

Ryan, Patrick J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428325, 428327, 428532, 428913, 264221, 264317, 249 61, 249 62, 164 15, B32B 900

Patent

active

052485528

ABSTRACT:
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.

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