Excessively high ink viscosity is a common and frustrating issue in offset and digital printing, leading to plate clogging and fine text smudging that ruins print clarity, raises waste rates and delays order delivery. Here are practical, actionable solutions tailored for industrial printing workflows:
First, add a dedicated thinner matching your ink type in small batches, stir thoroughly, and measure viscosity with a professional viscometer until it hits the standard (25–35 seconds via Zahn Cup No.4 for offset printing). Avoid over-adding to prevent color fading or poor ink adhesion to substrates.
Second, reduce pressure between the printing plate roller, offset blanket, and ink rollers to curb ink extrusion and spreading, then run a test print for precise fine-tuning.
Then, keep the workshop temperature at a stable 20–25℃ or install a constant-temperature ink tank heater to boost ink fluidity, as viscosity naturally drops with moderate temperature.
Finally, clean the plate and blanket thoroughly after each job, and replace worn blankets promptly to eliminate residue buildup and avoid recurring quality defects.