New Hybrid 3D Grinding™ Technology
A new revolutionary method for grinding the rolls for operational conditions
The aim of a traditional grinding process is to achieve good cylindricity and minimum runout at grinding shop.
Paper manufacturing process, however, requires good dynamic behavior at the operating speed. In Hybrid 3D Grinding™ technology, changes in dynamic roundness and deflection of the roll due to increasing running speed are taken into account when the geometry is optimized for running speed of the paper machine.
Using Hybrid DynaTest™ and Hybrid GrindControl 3D™ devices the runout of a backing roll of a coating station was decreased below 30 µm at the operating speed, in consequence of which the coating grammage variation (LWC paper) was decreased by 60% (Myllykoski Paper, Finland).
Roll maintenance based on process demands improves the runnability of the paper machine, decreases quality variations of a paper and extends service life of the rolls.
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Geometry of a traditionally ground backing roll at a grinding speed (above) and at an operating speed. Runout of the roll is 11 µm measured at the grinding speed and up to 121 µm at the operating speed. |  |
Geometry of a backing roll is optimized for operating speed by Hybrid DynaTest and Hybrid GrindControl 3D systems. The runout of the roll at a grinding speed is 115 µm and as low as 26 µm at an operating speed. |
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