Solutions to Plate Blocking, Ink Flying, and Static Issues in Gravure Printing

In the gravure printing process, plate blocking, ink flying, and static interference not only reduce production efficiency but also severely affect the appearance quality of printed products. Many users frequently replace inks or adjust equipment parameters, ignoring the key roles of ink formulation, environmental control, and substrate characteristics. Based on Shunfeng's application experience, solving these problems requires comprehensive strategies from ink performance, environmental management, and process optimization.

Printing Conditions

• Problem Manifestation: Ink dried deposits block the plate cells, leading to missing printed patterns; ink splashes into non-printing areas during high-speed printing, causing ink flying; static electricity on the printed surface adsorbs dust, resulting in streaks or spots.

• Solutions: Optimize the ink circulation filtration system and regularly clean the plate cells; adjust the matching of printing speed and ink viscosity to avoid ink flying caused by high-speed printing; install static elimination devices in the workshop and control environmental humidity between 45%-65% to reduce static accumulation.

Ink

• Rheology and Antistatic Performance of Ink: The thixotropy and evaporation rate of ink are the main causes of plate blocking, while ink flying is related to insufficient surface tension and viscosity of the ink; static issues mostly stem from the lack of antistatic agents in the ink formulation or high substrate insulation. For example, solvent-based inks are prone to plate blocking when drying too fast, while water-based inks require antistatic agents to reduce surface resistance.

• Solutions: Select inks with moderate thixotropy and controllable evaporation rates, add an appropriate amount of anti-skinning agent to prevent plate blocking; adjust ink surface tension and viscosity, or add an anti-splash agent to reduce ink flying; add antistatic agents to the ink, or use antistatic diluents to reduce surface resistance.

Substrate

• Surface Conductivity and Ink Compatibility: The surface conductivity of the substrate directly affects static accumulation, while the compatibility between the substrate and ink determines the risk of plate blocking and ink flying. High-insulation substrates (such as PP, PE) are prone to static electricity, while low-surface-energy substrates can cause uneven ink spreading and lead to ink flying.

• Solutions:

◦ For insulating substrates, use antistatic coatings or add antistatic masterbatches to improve surface conductivity.

◦ For low-surface-energy substrates, use surface treatment agents to improve ink wettability and reduce the risk of ink flying.

◦ For substrates prone to plate blocking, choose slow-drying inks and optimize drying conditions to prevent ink from drying in the cells.