In daily production on Komori press series, dot gain deformation is one of the most common issues encountered by press operators and maintenance personnel. These Japanese-built machines are known for their stability, with mature H-UV drying and automatic registration systems, and uniform ink train distribution. If not addressed promptly, the problem can range from affecting registration accuracy and print quality to causing extended downtime in severe cases.
I. Fault Symptoms: Shadow areas and highlight areas both plug up, dot gain rate exceeds tolerance, tonal gradation is lost, and prints show color cast.
II. Cause Analysis: Excessive printing pressure, overly thick packing, inappropriate blanket hardness, excessive ink flowability, and lack of dot gain compensation (G7/dot curve) calibration. Given the characteristics of Komori Japanese machines—renowned stability, mature H-UV drying and automatic registration systems, and uniform ink train distribution—the troubleshooting process should prioritize checking key components and standard parameters.
III. Repair Procedure: Reduce printing pressure and thin the packing according to standard specifications; replace blankets with appropriate hardness; adjust ink viscosity and flowability; and import dot gain compensation curves.
IV. Preventive Measures: Perform regular print characteristic curve testing, keep pressure within the standard range, and calibrate color management.
The above methods also apply to models such as LS440, LS629, Lithrone, GL840, and G40. For actual operation, refer to the PQC Print Quality Control system / KMS console and on-site conditions. In complex situations, it is recommended to contact professional maintenance support through the printm.cn platform.
