1. Preliminary Preparation
Tools needed: Standard test screen with 0.1mm fine straight lines + crosshair alignment marks + 1mm dot spacing, flat blank printing substrate, 40x magnifying glass, vernier calipers/feeler gauge.
Preparation work: Run the machine idle for 15 minutes to warm it up. First, adjust the machine frame to be level, and clean the table and transmission parts of any residual ink or debris.
2. Static Positioning Accuracy Test (Basic Accuracy Verification)
Manually align the first print and print the first sample marked "First Article";
Repeat starting and stopping the machine 10 times, re-running the machine to the workstation after each start and stop, printing one sample for each;
Compare the crosshair deviation of all samples with the first article using a magnifying glass: The acceptable standard is all deviations ≤ 0.02mm.
3. Dynamic Continuous Production Accuracy Test (Core Verification in Actual Production): Set the equipment to its usual daily production speed and continuously print 100 samples without any adjustments during the process.
Select the last 10 samples and compare them with the first piece, measuring the pattern alignment deviation with calipers.
Acceptance Criterion: No more than one sample should have a deviation > 0.05mm; otherwise, the accuracy stability is not up to standard.
4. Multi-Color Overprint Cumulative Accuracy Test (Multi-Station Verification): For multi-color printers, install the same test screen at each station and repeatedly overprint the same pattern at each station.
After completing all stations, observe the clarity of the overprinted pattern: clear overprinting with no obvious misalignment of crosshairs indicates that the cumulative accuracy of each station is acceptable; otherwise, it is unacceptable.
5. Table Parallelism Auxiliary Test: Measure the gap between each table and the guide rail with a feeler gauge. A gap difference of ≤ 0.03mm at all positions is acceptable. Excessive gap difference indicates table deformation, which will directly affect printing accuracy.
