1. Registration Misregistration (Most common)
Continuous Misregistration in a Fixed Direction: Long-term misregistration in the same direction at a certain station is generally caused by loose positioning pins or worn track chains.
First and Last Product Misregistration: Registration deviation between the first and last products in the same batch exceeds 0.1mm, often due to insufficient machine warm-up or excessive track chain clearance.
Accumulated Misregistration of Multiple Colors: The more colors registered, the greater the deviation, mainly due to uncalibrated parallelism at each station, resulting in cumulative errors.
2. Pattern Consistency Issues
Uneven Blur and Ghosting: Blur on only one side of the pattern, after ruling out screen issues, is generally caused by the print head and printing platen not being parallel.
Dot Deformation and Blur: Small dots become deformed and blurry after printing, often due to uneven squeegee pressure or insufficient platen flatness.
Local Missing Print and Overprinting: Repeated missing prints or overprinting in a fixed area are usually caused by localized deformation or concavity of the printing platen.
3. Precision Issues Caused by Mechanical Structure
Uneven Tabletop Gap: Gap differences between the tabletop and guide rails at different locations exceeding 0.03mm can lead to random misalignment over long-term operation.
Excessive Transmission Play: Wear and tear on the chain track and guide wheels increases gaps, causing positioning deviations during equipment start-up and shutdown.
Frame Deformation and Tilting: Prolonged placement on uneven ground or stress deformation of the thin, low-cost frame leads to a continuous decline in overall machine precision.
4. Precision Issues Caused by the Electrical Control System
Station Positioning Misalignment: Loss of PLC parameters or servo motor malfunctions can cause inaccurate station positioning, resulting in inconsistent misalignment during each table movement.
Synchronization Error: Asynchronous movement of the printing heads causes regular misalignment during multi-color printing, usually due to signal transmission failure.
