Method for continuously producing molded members from a mixture

Details Method for continuously producing molded members from a mixture Method for continuously producing molded members from a mixture

1989-03-03

1990-07-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

106772, 156 39, 264113, 264122, 264333, B28C 540

Patent

active

049420038

ABSTRACT:
A method and apparatus for continuously producing molded member, especially sheets, from a mixture of gypsum and fibrous material. In a first mixing stage, measured-out quantities of gypsum and fibrous material are thoroughly mixed together, with the dry mixture being weighed and subsequently moistened in a second mixing stage by supplying water thereto in conformity to the weight of the dry mixture. The moistened mixture is subsequently dispersed onto a support to form molded members, with the surface of each molded member being additionally moistened, and the latter then being compacted. To achieve higher strength, the mas flow of the gypsum/fibrous material mixture is divided into independent partial mass flows that are dispersed in layers to form the multi-layer molded member, with each partial mass flow forming one of the layers of the molded member. Each deposited layer is additionally moistened with water, with the total quantity of water supplied to a given molded member equalling up to about 25% more than the stoichiometric quantity of water required for curing the gypsum/fibrous material mixture.

REFERENCES:
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patent: 3809566 (1974-05-01), Revord
patent: 3951735 (1976-04-01), Kondo et al.
patent: 4239716 (1980-12-01), Ishida et al.
patent: 4328178 (1982-05-01), Kossatz
patent: 4369025 (1983-01-01), von der Weid
The Chemistry and Technology of Gypsum, Kuntze, ed., 1984, pp. 44, 46, 51.
ASTM Designation C11-70.
Chemie Lexikon, Romp, 1966, p. 2548.
Webster's Third New International Dictionary, 1966, p. 1015.

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