Patent ID: 6418639
Filing Date: 2002-07-16
Classification: D21F

Abstract:
A method in a dryer section of a paper machine, in which dryer section a normal single-wire draw is applied at least partly, in which method the web (W) is passed through the dryer group on support of a drying sire (17;H), whose permeability to a drying medium is in the range between 2000-20000 m3/h/m2 (cubic meters per hour per square metre), which drying wire (17;H) presses the web (W) on the drying cylinders (10,Kn,Kn+1 . . . ) against the heated cylinder faces, and in which dryer section the web (W) on the reversing cylinders or rolls (14,Sn,Snâˆ’1 , . . . ) between the drying cylinders (10), remains at the side of the outside curve, and in which dryer section there is provided:an impingement blowing (P2) on the adjacent drying cylinders (10,Kn,Knâˆ’1 . . . ) and one of a support suction and blowing (P1, P3) inside an intercylinder pocket space (F) defined by the adjacent drying cylinders (10,Kn,Kn+1 . . . ) and the reversing cylinder or roll (14,Sn, Snâˆ’1 . . . ), wherein the suction and blowing (P1, P2, P3) are accomplished by one integrated impingement drying and runnability unit (R,20) extending from the intercylinder pocket (F) onto at least one drying cylinder (10,Kn,Knâˆ’1 . . . ), through which impingement drying and runnability unit is produced: a suction effect by means of one of the blowing and support suction (P1, P3) through the drying wire (17;H) to the web (W) in order to improve the runnability of the web (W) and to keep the web (W) on the face of the wire and the impingement blowing (P2) through the drying wire (17;H) to the web (W) in order to dry the web (W), regulate a curling of the web (W) and to control a tendency of curling of the web (W).