Advances in Press Roll Dewatering, 2012 PaperCon Conference

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Blind drilled, grooved and suction drilled rolls are commonly used on presses in the paper making process. The open areas in these rolls are designed to accept water from the fabric. It is important that all the water that is in these rolls be evacuated before the nip to prevent re-wetting the sheet and ensure optimum press nip performance. In some cases these rolls rely solely on centrifugal force to evacuate water, but this is often not sufficient especially when the fabric becomes filled and cannot accept as much water. Installation of double doctors on these rolls provides a more effective means of removing water from the open area and surface of the roll. Recent advances in blade and holder technology further improve this with special blade profiles and introduction of air to amplify evacuation of water from the roll surface. Benefits include higher sheet consistency, improved moisture profile, reduction in sheet breaks, and longer roll life due to cleaner holes and grooves.