Batch molding of open-cell soft polyurethane foam

Details Batch molding of open-cell soft polyurethane foam Batch molding of open-cell soft polyurethane foam

1990-03-08

1991-10-29

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

26433119, 264337, 264DIG77, B29D 3104, B29D 6722

Patent

active

050614207

ABSTRACT:
A method and apparatus (20) for batch molding open-cell soft polyurethane foam within a mold (22a, 22b, 104) is provided by introducing into a mixing chamber (26) of a mixing pot (24) a highly activated polyol component and an isocyanate component which are mixed and permitted to foam to provide upward expansion in a viscous state through an upper outlet (28) by free rise that fills the mold (22, 104). Such batch molding provides "one age of foam" that enables molding to be performed which was not previously possible. Both a rigid mold (22) and a flexible mold (104) can be utilized. The mixing pot (24) includes a mixer 38 preferably embodied by a rotatable screw (74) that is moved axially to purge the mixing chamber (26) of foam after each cycle. A plurality of the mixing pots (24) can be used to supply foam to the mold (22a, 22b), such that foam of the same composition is supplied to the mold (22a) as is necessary with large molds, or such that foam of different compositions is supplied to the mold (22b) as is necessary with certain foam products.

REFERENCES:
patent: 2649620 (1953-08-01), Miller
patent: 3268635 (1966-08-01), Kraus et al.
patent: 4045535 (1977-08-01), Patzer
patent: 4260355 (1981-04-01), Rohrig et al.
patent: 4264544 (1981-08-01), Wilheim
patent: 4309373 (1982-01-01), Althausen et al.
patent: 4717518 (1988-01-01), Cavender
patent: 4721279 (1988-01-01), Oleszko et al.
patent: 4721391 (1988-01-01), Bauer
patent: 4778659 (1988-10-01), Inoue

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