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Double doctors are often used on the suction couch roll to improve moisture profile and runnability, minimize rewet of the sheet, and keep the roll shell clean. The first blade removes surface water and creates a vacuum pulse that pulls water out of the roll holes. This water is then removed by the second blade. The center press roll double doctor is often accompanied by a roll shower to keep the roll surface clean. This doctor is often used to remove the sheet to a broke chute. And so the doctor back must be designed to withstand the additional force required.