Molding core
US5248552A · kind A · utility
7Cited by
31References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Nov 23, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.