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Adjustment of calender roll pressure balance
Calender rolls generally apply pressure using left and right cylinders. if The left-right pressure balance is poor, drift and quality problems occur. Also, nip rolls generally have crowns, change shape when nipping, and are designed to provide uniform nip pressure across the width. If the crown level and roll hardness are not appropriate for the pressure, defects and the rubber roll life can be reduced.
Used Product: Prescale (Low Pressure LW, Super Low Pressure LLW)
1
Left-right pressure balance
2
Crown configuration
Insert Prescale between the calender rolls to confirm whether the Prescale color density width is constant.
Whether the cylindericity and horizontal parallelness of calender rolls are in accordance with the design and whether the pressure is optimally adjusted can be evaluated under application of the actual pressure.
If the quality is not uniform, Prescale can be used to classify the factor of the problem, pressure distribution deviation, temperature distribution deviation or prior process stages.
If the quality is not uniform, Prescale can be used to classify the factor of the problem, pressure distribution deviation, temperature distribution deviation or prior process stages.
Poor
Good
Time savings
For roll exchange, etc., approximately half a day can be saved.
Material savings
The occurrence of material loss (several hundred meters of paper loss, etc.) can be prevented when defects occur.
Quality improvement
Defects can be prevented and yield can be increased.
Without using Prescale
When calender rolls are exchanged, the paper produced after startup is hecked. If there are defects, the old rolls are immediately reinstalled and production started. A new unit is ordered from the calender manufacturer. However, the cause is not identified in this case.
With Prescale
When calender rolls are exchanged, Prescale is used to check pressure. If it is confirmed that there is no problems, production can be started. If there are quality problems, causes can be quickly and easily identified.