Patent ID: 7536806

Claim:
A method of improving runnability and allowing for shortened dryer section of a paper or board machine comprising the steps of: after pressing a paper or board web in a press nip of a pressing section, drying a first side of the paper or board web by blowing air or other hot gas of a temperature of 250° C.-700° C. directly on to the first side of the paper or board web in a pre-impingement dryer in which impingement takes place directly against the paper or board web and not through a fabric; within a maximum distance of 4 meters of the pre-impingement dryer, drying the second side of the paper or board web in a second impingement dryer with blowing air or other hot gas of a temperature of 250° C.-700° C. on two sides of a loop formed by a support fabric, wherein the loop is in the vertical direction longer than its machine-directional dimension and is arranged such that the support fabric remains on the side of the paper or board web opposite blowing air; keeping the paper or board web attached to the support fabric using internal suction devices, which direct a suction effect to the paper web from inside the support fabric; within a maximum distance of 4 meters of the second impingement dryer, drying the second side of the paper or board web in a first group of steam heated dryer cylinders; contacting the web second side to a drying surface of a first dryer cylinder of the group of steam heated dryer cylinders having a temperature of approximately 80° C. and up to 130° C., wherein said drying surface is the drying surface of the first group of steam heated dryer cylinders to first contact the web; and wherein the paper or board web is heated by the second impingement dryer to a temperature which deviates less than 15° C. from the drying surface of the first dryer cylinder of the first group of steam heated dryer cylinders.