Papermaking machine with variable dewatering elements adjusted by computer control system in response to sensors of paper sheet characteristics

Abstract From the Canadian patent

An automatic control system for a papermaking machine having a plurality of variable dewatering devices with moveable elements which engage the conveyor carrying the paper stock and are adjusted by electrical operating devices such as, servo motors or solenoid valves to vary their water removal rate in response to, control signals produced by a computer controller. A plurality of sensors are spaced along the path of the paper sheet downstream from the variable dewatering devices to sense the paper sheet characteristics including light transparency and mass, and to apply sensor output signals corresponding thereto, to the computer controller. The servo motors have their shafts coupled to …