I. Abnormal Printing Quality Assessment
Registration Accuracy Degradation: If the printed product shows significant registration errors (e.g., multi-color patterns misaligned by more than 0.1mm), it may be due to wear of the roller bushings or reduced gear precision.
Ink Streaks and Ghosting: Persistent ink streaks or text ghosting on the image may be caused by roller runout (radial/axial) or doctor blade wear.
Dot Distortion: Severe blurring or distortion of 150-line 50% halftone dots indicates wear of mechanical components requiring repair.
II. Mechanical Wear Detection
Key Component Inspection:
A major overhaul is required if the clearance between the roller bushing and journal exceeds 1-2 times the manufacturing standard.
Worn or chipped gears need to be replaced to avoid cumulative transmission errors.
Pneumatic System Testing: If the pneumatic lifting device has delayed response or unstable air pressure, the seals or cylinders may need to be replaced.
III. Service Life and Failure Frequency
Regular Cycle: After 10 years of use, the maintenance costs of industrial-grade equipment increase significantly, and a comprehensive assessment is recommended.
Sudden Failures: Frequent PLC alarms (such as abnormal I/O signals) or mechanical jamming require systematic inspection and repair.
IV. Comprehensive Decision-Making Recommendations
Based on data from printing quality, mechanical precision, and service life, a major overhaul is recommended if the following conditions are met simultaneously:
Registration errors consistently exceed the standard and adjustments are ineffective;
Key geometric precision (such as roller runout) exceeds acceptance standards;
The equipment has been in operation for over 10 years and the failure rate is increasing.
