Moisture Regain between Mill Conditioning and an Unheated Warehouse
Unheated storage drives moisture ingress along sheet edges via psychrometric gradients, requiring sealed barrier wraps and strict thermal acclimation before press run.
Offset Misregister
Image Displacement
Plate slippage during high speed lithographic runs creates physical lateral drift across paper substrates, leaving successive color passes misaligned on the sheet. Mechanical play inside cylinder gears and dampening blankets generates physical shifting that pulls the final cyan, magenta, yellow, and black impressions apart from their intended registration marks. Production tolerances in commercial folding carton manufacturing dictate that variance exceeding seventy micrometers triggers immediate makeready adjustments on the press console.
Color Bleeding
Unwanted optical fringing occurs when overlapping dot patterns shift away from their designated trapping zones on coated art paper. Visual distortion appears at fine text boundaries and dark graphic edges where plates drift outside acceptable dot gain thresholds during multi-pass ink transfer. Cylinder backlash and web tension fluctuations compound the mechanical error, forcing converters to rerun entire stock batches when visual overlap violates brand color standards.
Mechanical Tolerance
Gear wear inside offset printing towers introduces cumulative play that ultimately destabilizes substrate feeding through consecutive print units. Technicians measure peripheral speed discrepancies between plate and blanket cylinders to isolate the root cause of lateral shifting before starting high volume runs. Press operators adjust blanket packing layers and tension rollers to counteract mechanical backlash, ensuring subsequent impressions match the original plate geometry within strict mill tolerances.