![extrudeuse de 2 couleurs extrudeuse de 2 couleurs](https://abwinbest.com/99-thickbox_default/imprimante-3d-freesculpt-ex2-basic-a-double-extrudeuse.jpg)
The displaced water is separated and the dispersion of the pigment in the varnish can be used as a pigment paste in preparing an ink or paint.The batch process has many shortcomings. If the pigment is used in an ink or coating composition, however, it must first be well-dispersed in an appropriate organic medium in order to achieve the desired color development and stability, and thus the flushing process is advantageous because it accomplishes the transfer without intermediate steps of drying the pigment and grinding the pigment in the organic medium to produce the pigment dispersion.In the past, pigment flushes have usually been prepared by batch processes in which the press cake is kneaded with an organic phase such as an oil and/or a resin, for example in a sigma blade mixer or dough mixer, to flush the pigment particles from the water phase to the organic medium phase and displace the water as a separate aqueous phase.
![extrudeuse de 2 couleurs extrudeuse de 2 couleurs](https://image.dhgate.com/0x0s/f2-albu-g5-M00-EF-4D-rBVaJFmlIPGAcOCRAASfzTZJzZc948.jpg)
The flushing process requires additional time and materials over simply drying the pigment. Flushing assists in keeping pigment particles non-agglomerated and easier to use in making inks or coatings. The press cake thatresults is then either dried to provide a dry, particulate pigment or else is "flushed" with an organic medium such as an oil and/or resin to transfer the pigment particles from the aqueous press cake to the oil or resin phase. The present invention also relates to methods for preparing ink bases and finished ink compositions.BACKGROUND OF THE INVENTIONSyntheses of many organic pigments include a coupling step in a dilute aqueous medium to produce a slurry of the pigment product, which is typically followed by filtering the slurry in a filter press to concentrate the pigment.
![extrudeuse de 2 couleurs extrudeuse de 2 couleurs](https://imgaz.staticbg.com/thumb/large/oaupload/banggood/images/B7/7C/5e0e5243-719b-4557-b635-f94b42d1f259.png)
FIELD OF THE INVENTIONThe present invention relates to processes for preparing pigment flushes, particularly pigment flushes for ink compositions.