A sheet manufacturing apparatus includes a processing roller, a first processing unit configured to clean the processing roller, a second processing unit configured to separate the first processing unit from the processing roller, a driving unit configured to drive the first processing unit and the second processing unit, and a gear interposed between the driving unit and the first processing unit and the second processing unit. The gear includes an input gear configured to receive driving force from the driving unit, an input shaft configured to rotate in conjunction with the input gear, and a first gear and a second gear whose rotation shaft is the input shaft. Driving force in a first rotation direction is output from the input shaft to the first processing unit via the first gear, and driving force in a second rotation direction is output from the input shaft to the second processing unit via the second gear.

A drainage device for removing dirt particles and wastewater from a cleaning head for cleaning a dryer screen of a paper production plant includes an air-water separation container. The air-water separation container includes an air outlet, a wastewater outlet and an inlet opening for receiving the dirt particles and the wastewater from the cleaning head. The air-water separation container is connected to the cleaning head so as to be movable transversely relative to the dryer screen together with the cleaning head.

A drainage device for removing dirt particles and wastewater from a cleaning head for cleaning a dryer screen of a paper production plant includes an air-water separation container. The air-water separation container includes an air outlet, a wastewater outlet and an inlet opening for receiving the dirt particles and the wastewater from the cleaning head. The air-water separation container is connected to the cleaning head so as to be movable transversely relative to the dryer screen together with the cleaning head.

A monitoring system for monitoring the conditions of a band circulating in a paper making machine is provided with: a detecting device configured to detect at least one parameter indicative of the conditions of the band; and with a moving assembly configured to move the detecting device along a direction transversal to the circulating direction of the band and comprising a cable moving device.

A method for cleaning a belt of a through air drying papermaking machine in which a high pressure shower is configured to traverse across a width of the belt of the papermaking machine while ejecting water onto the belt, and a vacuum box is operatively connected to the high pressure shower. The high pressure shower has a width that is less than a full width of the belt.

[TASK] Provided is a method of spraying a chemical solution, the method being capable of efficiently applying a chemical solution to a traveling canvas and sufficiently preventing the adhesion of paper powder and pitch to the canvas.

[MEANS OF SOLVING THE PROBLEM] The present invention provides a method of spraying a chemical solution Y, the method comprising spraying the chemical solution Y continuously on a canvas K used in a dry part D of a paper machine by a spraying apparatus 10 while making the canvas K travel, wherein the canvas K is guided to an inside roll IR and an outside roll OR, and wherein the spraying apparatus 10 is disposed upstream from the outside roll OR and between the inside roll IR and the outside roll OR, and the chemical solution Y is sprayed toward the outside roll OR along a travel direction Y2 of the canvas K.

A chemical solution spraying method for spraying a chemical solution onto a canvas K1 has a loop shape in a side view while reciprocating two nozzle devices S at the same speed along rail L extending in a width direction of canvas K1 with respect to canvas K1, in which time period Tc during which canvas K1 is in contact with wet paper X is 0.03 seconds or more, time period Tn required for nozzle devices S to each one-way move is 0.5 to 10 minutes, traveling speed Vp of canvas K1 is 500 m/min or more, length K of canvas K1 is 20 to 80 m, a number of times of contact N of any point on a surface of canvas K1 with wet paper X during time period Tn, time period Tn, traveling speed Vp, and length K satisfy a relationship of N=(Tn.Math.Vp)/K, under predetermined conditions.

A sensor signal is generated from a plurality of sensors located on a sensing roll, wherein each signal is generated when each sensor enters a nip between the sensing roll and a mating roll during each rotation of the sensing roll. An oscillating component such as a doctor blade or cleaning shower affects a web of material upstream from the nip. Each sensor generates a sensor signal upon entering the nip. A periodically occurring starting reference is generated that is associated with each oscillation of the oscillating component and the signal generated by each sensor is received so that a particular one of the sensors which generated the signal is determined and one of a plurality of tracking segments associated with the oscillating component is identified. The signal is stored to associate the sensor signal with the identified one tracking segment.