In daily production on BEIREN series printing presses, dirtying, plugging, and pitting of the plate are among the most common problems encountered by press operators and maintenance personnel. As a representative domestic offset press, this model features strong parts interchangeability, low maintenance costs, and mostly domestic PLC-based electrical control. If not addressed promptly, the consequences range from compromised registration accuracy and print quality to extended downtime in severe cases.
I. Fault Symptoms: Non-image areas of the plate become dirty, dots are lost (pitting), or the entire plate plugs up (plugging), with an imbalance in the ink–water relationship.
II. Cause Analysis: Improper dampening solution acidity/pH, insufficient water volume, low ink viscosity, severe emulsification, insufficient plate exposure/development, and excessive water roller pressure causing smearing. Given that the BEIREN is a representative domestic offset press with strong parts interchangeability, low maintenance costs, and mostly domestic PLC-based electrical control, troubleshooting should prioritize checking key components and standard parameters.
III. Treatment Steps: Improve pH stability of the dampening solution, increase water volume and run a test, adjust ink viscosity or change the formulation, re-expose the plate and recheck exposure/development, calibrate water roller pressure, and clean the roller nap.
IV. 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 BEIREN 300, BEIREN 400, PZ4880, and N300. For actual operation, combine with the domestic CNC system / centralized lubrication control and on-site conditions. For complex situations, it is recommended to contact professional maintenance support via the printm.cn platform.
