Method for molding a block of polyurethane foam having a flat up

Details Method for molding a block of polyurethane foam having a flat up Method for molding a block of polyurethane foam having a flat up

1975-07-03

1978-05-09

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

264 402, 264 464, 264 51, 264331, 264338, B29D 2704

Patent

active

040887227

ABSTRACT:
A method is provided to make substantially flat-topped blocks of plastics foam, e.g. polyurethane, by a batch process. The foam-forming reaction mixture is dispensed into a cavity defined by a support and shaping members for the sides of the block. As the foaming commences the support is lowered so that the zone of contact between the shaping members and the foam remains constant. By this means the dome-shaped effect of free-foaming is avoided.

REFERENCES:
patent: 2588151 (1952-03-01), Nelson et al.
patent: 3325573 (1967-06-01), Boon et al.
patent: 3325823 (1967-06-01), Boon
patent: 3537131 (1970-11-01), Kracht et al.
patent: 3553300 (1971-01-01), Buff
patent: 3642398 (1972-02-01), Rudgisch
patent: 3719223 (1973-03-01), Jarema et al.
patent: 3786122 (1974-01-01), Berg
patent: 3840628 (1974-10-01), Stastny et al.
patent: 3840629 (1974-10-01), Marjoram
patent: 3887670 (1975-06-01), Porter

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