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

1991-07-10

1992-11-17

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425207, 425561, 425817R, 264 54, B29C 4547, B29C 4553

Patent

active

051641976

ABSTRACT:
An 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 supplyy 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.

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