Process for producing molds, models and tools based on hard gyps

Details Process for producing molds, models and tools based on hard gyps Process for producing molds, models and tools based on hard gyps

1986-05-28

1988-06-07

Wityshyn, Michael

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156247, 106 382, 106 383, 106103, 106109, 264220, 264225, 264240, 264241, B32B 1302, B32B 1304, B32B 3112

Patent

active

047494310

ABSTRACT:
A process for producing molds, models and tools from hard gypsum and/or cement including applying at least one base layer composed of a binder to a model from which a mold is to be made and which has been provided with an unmolding agent, and pressing onto this base layer a glass fiber reinforced molding composition composed of 95 to 0 weight % .alpha.-calcium sulfate hemihydrate, 0 to 95 weight % cement, 0.5 to 8 weight % glass fibers and 0.5 to 4 weight % suspension agent, with reference to the dry weight, as well as water in a wet-on-wet process and unmolding the resulting laminate after it has set.

REFERENCES:
patent: 4067939 (1978-01-01), Lowe et al.
patent: 4072534 (1978-02-01), Ryder
patent: 4127628 (1978-11-01), Uchida
Chemical Abstracts, vol. 89, p. 265, #64024f.

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