Application Case Study

Discussion: A manufacturer of solvent based inks was having difficulty with agglomerated particles in the ink. They required a filtration scheme that would remove the large agglomerates while maintaining the colored pigments in the ink. Several competitive products from GE, Parker and PTI were evaluated along with the Graver QXL series products. Pall filters were considered, but excluded from consideration due to high cost. Criteria used to evaluate the filters were consistency in ink quality, pressure drop, and on-stream life. They also desired products that would work for all ink colors as well as for aqueous based inks. To evaluate the filters, ink particle counts were measured and a small batch of ink was filtered through lab scale media to estimate the batch process time and filter usage.