Inkjet Ink Filtration Tests
Ink jet inks are made of colloidally stable pigments. In order for proper deposition onto paper the ink must successfully traverse microtubing within the ink cartridge. When these colloids become unstable and agglomerate or coalesce the tubing clogs and the cartridge fails to deposit ink. To combat this issue ink manufacturers have investigated filtering the ink as a last step before packaging in the hopes of decreasing the concentration of oversized particles within the printing cartridge.
SPOS technology for Inkjet Ink Filtration Tests
With SPOS technology it is possible to determine the concentration of oversized particles within an ink sample. Figure A shows an overlay of SPOS results for a filtered and unfiltered ink sample. The filtered sample shows a significant decrease in the concentration of particles >0.5 microns. With this data the manufacturer was able adjust processing in order to optimize functionality of the ink jet cartridges.