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The dimensional accuracy of corrugated cardboard, particularly with respect to cutting length, is critical in ensuring consistent carton production and cost efficiency. Variations in cutting length can lead to downstream manufacturing inconsistencies and increased material waste. Therefore, maintaining high precision in the cutting process is essential. The following outlines potential causes of inconsistent cutting lengths and corresponding corrective measures.
1. Root Cause Analysis:
(1) Unstable rotational speed of the dryer motor.
(2) Presence of paper fibers or debris between cross-cutting gears, or damage to gears and bearings.
(3) Excessive resistance during the conveyance of single-faced corrugated board on the overhead conveyor.
(4) Excessively high brake tension applied to the liner paper.
(5) Slippage of the dryer's conveyor belt.
(6) Excessive gear meshing clearance in the variable-speed transmission system of the cross-cutting machine, or aging/loosening of the drive chain.
(7) Malfunction or interference in the cross-cut control program due to strong electromagnetic fields.
2. Corrective Actions:
(1) Inspect the dryer's main motor for phase deficiencies, voltage instability, and bearing integrity.
(2) Clean debris from the rotary gears of the cross-cutter and replace damaged gears or bearings as necessary.
(3) For obstructed rotation of guide rollers on the overhead conveyor, apply lubricant or replace faulty bearings; simultaneously adjust vacuum suction levels for single-faced board handling.
(4) Reduce the braking force applied to the liner roll.
(5) Regularly clean the dryer conveyor belt and maintain clean heating plates. If slippage occurs during operation, lightly misting water onto the belt surface may temporarily improve traction. Avoid running the dryer without paper feed, as prolonged idle operation increases direct contact friction between the belt and heated plates, potentially smoothing the belt surface and exacerbating slippage.
(6) Adjust gear clearance in the variable-speed transmission system, replace worn chains, or tighten and realign the drive mechanism.
(7) Identify and eliminate sources of electromagnetic interference affecting the control system.
