© 2019 Kadant Solutions Division Challenge A linerboard machine in the Northwest U.S. used PolyflexTM doctor blades on the first press self-loading controlled crown roll and the blade would often hydroplane. With 0.250” thick blades, the contact area between the blade and roll is often very large, resulting in low specific pressure at the blade tip. The hydroplaning would result in water ringing the roll. Mill personnel continued increasing the loading of the blade to ensure the blade was in contact with the roll. The higher loading resulted in roll wear. Solution The mill installed a 0.050” thick SofTek doctor blade. The difference in thickness resulted in more load transmittance to the blade tip even with significantly lowe

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