Excessive dilution water is added to the vacuum broke chest. Especially when the chest only processes paper trims, check the spray water control and water pressure.
Overflow from the wire pit flows into the vacuum broke chest. Adjust the overflow of the wire pit to prevent excessive dilution water from entering the broke handling system.
The vacuum broke chest has insufficient capacity to process wet broke. Modify the dispersing equipment to meet the dispersion requirements for full-width broke.
Inspect all pumps and control systems equipped for the broke handling system.
Verify whether the pump capacity can meet high flow demands, and check the length of the pump suction line.
Check the control configuration of the vacuum broke chest.
Broke floats in the pulper. The pulper shall submerge the broke and defiber it promptly.
Adjust the position of the spray pipe.
Check the circulation system.
Ensure sufficient agitation to draw the broke into the rotor area.
Liquid level fluctuation occurs in the broke pulper.
Check if the level sensor is clogged by broke.
Inspect the turbine rotor and extraction plate
Adjust the gap between rotor blades and screen plate
Clogged screen plate may cause pump dry running and subsequent equipment damage
Check pump performance
Insufficient designed capacity will lead to material shortage
Pulping and pumping capacity often fail to keep pace with paper machine upgrades and increased operating speed
Broke chestEnsure adequate capacity. Most paper machines are equipped with under-capacity broke chests.
Inspect the agitator and control system
Maintain proper stock storage consistency
Control systemComplete calibration and routine maintenance for all control devices. Poor consistency control will affect the entire system and paper machine operation.
Unstable water dilution
Excessive white water demand will cause paper breaks
Ensure sufficient white water storage capacity
