Challenge A paper mill had a DST doctor with traditional turnbuckles on its 1 st top press roll. Over time, there were broken turnbuckle rod end bushings caused by the press roll arms opening and closing unevenly. This eventually caused serious issues with the sheet getting by the blade. The mill concluded the doctor was twisted. Solution Kadant proposed a doctor with OLE turnbuckles designed to accommodate press arm misalignment without subjecting the doctor bearings, turnbuckle rod end bushings, or the doctor back to excessive forces. This press misalignment, or scissoring, can occur during the opening and closing of a doctored press roll. The equipment was designed to fit a 31” diameter, 176” roll face with a maximum machine speed of 3,000 fpm. Results Af

Join for free to read