Method of molding an artifcial urethane rock

Details Method of molding an artifcial urethane rock Method of molding an artifcial urethane rock

1987-12-03

1989-07-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Extrusion molding

264 464, 264220, 264225, B29C 6720

Patent

active

048470260

ABSTRACT:
A method for producing simulated rocks by spraying a high density polyurethane elastomer in a flexible mold. The method includes reproducing a rock in molded form, not limited in size. A flexible mold is prepared by applying numerous coats of latex rubber upon the rock exterior in combination with a fabric embedded within the rubber latex layers. A supporting cradle for the latex mold is produced by spraying a low density urethane foam composition over the latex mold. The mold and cradle are stripped from the rock and are sprayed with a two component structural urethane system employing an isocyanate component and a polyol component with appropriate catalysts fillers and additives. The structural urethane elastomer is built up to substantial thickness to provide a strong load bearing polyurethane molded rock simulating the original rock surface with curing taking place in a matter of seconds or minutes. After cooling, the molded urethane rock is removed and the mold may be reused for repeated molding operations.

REFERENCES:
patent: 3703572 (1972-11-01), Bellasalma
patent: 3723584 (1973-03-01), Nussbaum
patent: 3883627 (1975-05-01), Fitts
patent: 3950477 (1976-04-01), Di Giacomo
patent: 4043826 (1977-08-01), Hum
patent: 4650625 (1987-03-01), Pentlow
patent: 4668451 (1987-05-01), Langson

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