Process for core removal from molded products
US5089186A · kind A · utility
45Cited by
20References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Jul 11, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C33/52
- 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.