Method and equipment for manufacturing pigment dispersion

Details Method and equipment for manufacturing pigment dispersion Method and equipment for manufacturing pigment dispersion

1983-06-21

1984-10-02

Simone, Timothy F.

Agitating

Rubber or heavy plastic working

With specified vent means

366 85, 366139, 366301, 366318, 425208, 425209, B29B 110

Patent

active

044744730

ABSTRACT:
Pigment dispersion is manufactured by continuously flushing pigment press-cake. First and second troughs supply hydrophobic liquid organic media and the pigment wet-cake respectively at a constant rate to a twin screw co-rotating extruder having a L/D (length/diameter) value of 25 or more. The twin screw co-rotating extruder includes a feeding part where the hydrophobic liquid organic media and the pigment wet-cake are fed from the first and second troughs, a flushing part for flushing the pigment particles from water phase to form an organic medium phase, and a dehydrating part for removing water from the flushed mixture. The hydrophobic liquid organic media and the pigment wet-cake are fed to the twin screw co-rotating extruder, and the pigment press-cake is flushed and dehydrated continuously in the extruder to obtain the pigment dispersion.

REFERENCES:
patent: 3802670 (1974-04-01), Okada et al.
patent: 3873474 (1975-03-01), Ficker
patent: 4054271 (1977-10-01), Lanzillo

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