In daily production on Ryobi (Ryobi / Liyoubi) series presses, dirty plates, plugging, and spotting are among the most common problems encountered by press operators and maintenance personnel. This machine model is a mainstay in the Japanese small-to-medium format segment, offering simple operation, a straightforward air and dampening circuit design, and easy maintenance. However, if not addressed promptly, it 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 (spotting), or the entire plate plugs up (plugging), with an imbalance in the ink-water relationship.
2. Cause Analysis: Improper fountain solution acidity/pH, insufficient water volume, low ink viscosity, severe emulsification, insufficient plate exposure/development, excessive dampening roller pressure, and smearing. Given the Ryobi's characteristics as a Japanese small-to-medium format mainstay with simple operation, a straightforward air and dampening circuit design, and easy maintenance, troubleshooting should prioritize checking key components and standard parameters.
3. Treatment Steps: Improve pH stability of the fountain solution, increase water volume for a test run, adjust ink viscosity or change the formulation, re-expose the plate and recheck exposure/development, adjust dampening roller pressure, and clean the roller nap cloth.
4. Preventive Measures: Stabilize fountain solution parameters, control emulsification rate, and standardize the plate-making process. The above methods also apply to models such as the 920, 1050, 920PF, and MHI. For practical operation, combine with the PCS console / automatic dampening system and on-site conditions. For complex situations, it is recommended to contact professional maintenance support through the printm.cn platform.
