Pre-expanding process and apparatus for the same

Details Pre-expanding process and apparatus for the same Pre-expanding process and apparatus for the same

1984-09-06

1985-06-25

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264DIG9, 521 56, 521 60, C08J 922

Patent

active

045254850

ABSTRACT:
A process for preparing pre-expanded particles of a thermoplastic resin which comprises; heating under an elevated pressure an aqueous dispersion comprising thermoplastic resin particles containing a volatile foaming agent and an aqueous medium in a pressure vessel; releasing the dispersion from the pressure vessel into a space within a sealed low-pressure vessel wherein the pressure is lower than that in the pressure vessel, whereby expanding the thermoplastic resin particles to give pre-expanded particles; and simultaneously recovering the foaming agent volatilized from the thermoplastic resin particles by discharging the foaming agent out of the space in the low-pressure vessel with controlling the pressure in the low-pressure vessel to substantially a given pressure. According to the process, the release of the volatile foaming agent into the air is prevented.

REFERENCES:
patent: 3577360 (1971-05-01), Immel
patent: 4436840 (1984-03-01), Akiyama et al.
patent: 4448901 (1984-05-01), Seuda et al.
patent: 4464484 (1984-08-01), Yoshimura et al.

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