System for cleaning continuous belts/blankets at papermaking machines sprays the belt surface with a cleaning fluid to give wet surfaces exposed to ultrasonic waves and dissolve impurities for removal with the fluid

摘要

To clean continuous belts and blankets (1), at machines for the prodn. or finishing of fiber webs of paper or cardboard or tissue, it is treated with a cleaning fluid and the wet zones are exposed to ultrasonic waves for the cleaning action. The wet cleaning fluid is removed from the belt (1) together with dissolved impurities. The cleaning fluid is applied to the belt (1) before and/or during the exposure to ultrasonic waves. The cleaning fluid is heated to a temp. of 50-75 deg C and pref. 60-65 deg C. The cleaning fluid is applied to the belt (1) surface in a thickness of 0.05-2.0 mm and pref. 0.1-0.5 mm. The cleaning fluid is primarily water, which can contain additives of cleaning chemicals and/or solid particles. An Independent claim is included for a belt cleaning appts. where the belt (1) is moved past an ultrasonic wave transmitter (3). The cleaning fluid is supplied to the belt (1) surface before and/or during exposure to ultrasonic waves (3). The cleaning fluid, together with dissolved impurities, is caught (4) and removed for disposal. Preferred Features: The cleaning fluid is applied to the belt (1) surface by a spray pipe (5), at least partially in front of the ultrasonic wave transmitter (3), and also at least partially through a channel (6) at the ultrasonic wave transmitter (3). The cleaning fluid can also be sprayed partially at the ultrasonic transmitter (3) by the spray pipe (3), to pass to the belt surface. The ultrasonic wave transmitter (3) has a reciprocating movement across the belt (1) width, and the spray pipe (5) moves with it. The fluid catch unit (4) is linked to a vacuum source. The ultrasonic wave transmitter (3) is a sliding shoe, with a surface (7) towards the belt (1) pref. of metal and/or ceramic material. The sliding shoe penetrates into the moving path of the belt (1).