Process for making foam-in-form polyurethane foam buns and apparatus therefor
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United States of America Patent
Stats
-
May 27, 1986
Grant Date -
N/A
app pub date -
Jan 30, 1985
filing date -
Jan 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method for manufacturing a foam-filled polyurethane foam bun from foam particles having uniformly dispersed therewith large amounts of solid material bonded together with new polyurethane foam is described. The method comprises uniformly applying a liquid flexible polyurethane foam-forming material to a dispersion of foam particles and solid material to provide a blend, distributing the blend within a mold, and foaming and curing the foam-forming material by a plurality of steaming steps wherein the mold is flipped from a first to second position between steaming steps. The foam buns have a uniform density gradient. Foam buns are disclosed having a variation in density across the foam bun. There is also disclosed an improved char-forming foam obtained as a result of using boric acid in the foam-forming formulation.
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Family
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Cited Art Landscape
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