of the dryer section 12 as the wetting which is critical for the tail threading event must have time to be absorbed and spread evenly through the web before the web reaches the end of the dryer section 12 on the other hand wetting must not happen too early as the web may then adhere to a dryer cylinder 16 the wetting device 15 is formed by a tubular bar 24 which extends over the full width of the web with nozzles 22 installed in it a tubular bar 24 is attached to the frame of doctor 19 in the tubular bar 24 there are nozzles 22 of a specific size at a suitable distance to each other in one pilot test a 25 mm tube was used in the wetting device 15 which tube was equipped with alternately located vee jet 9503 and vee jet 9504 nozzles at 170 mm intervals and at a distance of 280 mm from the web the diameters of the nozzles are 1 1 mm and 1 3 mm spraying angle 95 degree hence the wetting device 15 is a considerably cruder arrangement than the rewetting devices 30 at the end of dryer section 12 which will affect the moisture profile without essentially changing the moisture level of the web nozzles 22 are located in the upper edges of the tubular bar 24 so that the apparatus will remain full of liquid after the valve is closed and the water pressure will be at the required level immediately the valve is reopened the nozzles 22 of the wetting device 15 are aimed at the web as it travels upwards in other words in front of the doctor.