Press Section Grinds: Understanding the Impace of Axial Concentricity, 23TAPPICon

Energy efficiency has become a top priority for paper mills when process decisions are made. The goal of this study was to determine if steam usage would be reduced, or if paper machine speed increased, by improving the geometric tolerances of the press roll section. This was achieved by improvement in axle-to-roll face concentricity, roundness, shape, and profile.

An analysis of data over 17 months produced three key findings. Cross-direction moisture two-sigma variation was reduced by 19.08% over seven months when the bottom crown-controlled press roll was installed. Machine speed increased 18 feet-per-minute, however, the lack of system controls made it difficult to determine if the press roll was the direct cause of the machine speed increase. An unexpected result was a 25.10% decrease in vacuum required in the pick-up felt uhle box. This indicates a reduced need for water removal. Future studies will examine how reducing the vacuum needed in the press section impacts felt life.

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