Process for core removal from molded products
AssigneeAdvanced Plastics Partnership
InventorsTimothy M. Moore, Gerbrig W. Van Der Woude
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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.
Claims30
A method of removing a molding core from a molded product wherein said core comprises a particulate inert material which is formed into a discrete configuration conforming to the configuration of at least a portion of the molded product and the particulate inert material is bound in said configuration by a cured binder comprising a water soluble carbohydrate, said method comprising exposing said bound core with said water soluble carbohydrate therein and said molded product to water after the product has been molded to disintegrate and remove the core from the molded product.
Dependencies are inferred from the claim text.