Process for making foam-in-form polyurethane foam buns and appar

Details Process for making foam-in-form polyurethane foam buns and appar Process for making foam-in-form polyurethane foam buns and appar

1985-01-30

1986-05-27

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 457, 264109, 264DIG7, 425435, B29C 6720

Patent

active

045914699

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.

REFERENCES:
patent: 4438220 (1984-03-01), Fracalossi et al.
patent: 4438221 (1984-03-01), Fracalossi et al.

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