New Dimatix SAMBA cartridges. How to change the rheology of inks?

13 October 2021 0 5K Report

Recently, Fujifilm has released new inkjet cartridges for the Dimatix DMP-2850 printer, called SAMBA 2.5pl.

I have been using npAg conductive inks and SU-8 photoresist ink with the previous cartridges. However, with the change to the new SAMBA cartridges, these inks are no longer useful because their surface tension and viscosity are not compatible.

I am considering the option of modifying the inks to make them lower viscosity and lower surface tension.

SAMBA cartridges: viscosity 4 - 8 cpsf, surface tension 28 - 32 dynes/cmg

Silver Ink (Sigma-Aldrich): viscosity 10 - 18 cpsf, surface tension 35 - 40 dynes/cmg, solvent: triethylene glycol monomethyl ether.

XP PriElex® SU-8 1.0: Surface Tension: 30 Dynes/cm, Viscosity: 9.19 cSt, Solvents: Propylene glycol methyl ether acetate (PGMEA) and cyclopentanone.

In principle, the viscosity of solvents is lower than that of inks, so adding solvent could successfully lower the viscosity. The problem will be with the surface tension, does anyone have any idea how I can change this surface tension taking into account the nature of these solvents?

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