In daily production on Mitsubishi series printing presses, dirtying, plugging, and picking on the plate are among the most common problems encountered by press operators and maintenance personnel. These Japanese-built machines are known for high durability and stable ink density, with cylinder diameters designed to balance speed and quality. If not addressed promptly, the issue can range from affecting registration accuracy and print quality to causing extended downtime in severe cases.
1. Fault Symptoms: Non-image areas of the plate become dirty, dots are lost (picking/flowering), or the entire plate plugs up (plugging), with an imbalance in the water-ink relationship.
2. Cause Analysis: Incorrect dampening solution acidity/pH, insufficient water volume, low ink viscosity, severe emulsification, insufficient plate exposure/development, and excessive friction from low water roller pressure. Given that Mitsubishi Japanese presses are prized for high durability and stable ink density, with cylinder diameters designed to balance speed and quality, priority should be given to checking key components and standard parameters during troubleshooting.
3. Treatment Steps: Stabilize the pH of the dampening solution and increase water volume for trial running; adjust ink viscosity or change the ink formulation; re-expose the plate and recheck exposure and development; adjust water roller pressure and clean the roller nap.
4. Preventive Measures: Stabilize dampening solution parameters, control the emulsification rate, and standardize the plate-making process. The above methods also apply to models such as the D3000, DiaPress, Diamond series, and 3F. For practical operation, combine with the MAC automatic control system / CCB ink fountain and on-site conditions. In complex cases, it is recommended to contact professional maintenance support via the printm.cn platform.
