In daily production on BEIREN series printing presses, dot gain distortion is one of 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 controls. If not addressed promptly, it can affect registration accuracy and print quality in minor cases, or cause extended downtime in severe cases.
1. Fault Symptoms: Dark tones and highlights become blocked, dot gain rate exceeds the standard, tonal gradation is lost, and prints show color cast.
2. Cause Analysis: Excessive printing pressure, overly thick packing, unsuitable blanket hardness, excessive ink flow, and lack of dot gain compensation (G7/dot curve calibration). Given that the BEIREN is a representative domestic offset press with strong parts interchangeability, low maintenance costs, and mostly domestic PLC-based electrical controls, troubleshooting should prioritize checking key components and standard parameters.
3. Practical Repair: Reduce printing pressure to standard values, thin the packing, replace blankets with appropriate hardness, adjust ink viscosity and flow, and import dot gain compensation curves.
4. Preventive Measures: Regularly run print characteristic curves, keep pressure within the standard range, and calibrate color management.
The above methods also apply to models such as BEIREN 300, BEIREN 400, PZ4880, and N300. For actual operations, please adapt to the domestic CNC system / centralized lubrication control and on-site working conditions. For complex situations, it is recommended to contact professional maintenance support via the printm.cn platform.
