Patent ID: 7036242

Claim:
An impingement drying unit for a dryer section of a machine making a fibrous web, which dryer section comprises at least one drying group and at least one impingement drying unit which extends above and/or below a row of drying cylinders and in which impingement drying unit the web is conducted past the impingement drying unit while supported by a drying fabric, the drying fabric extending between at least two vertically spaced support rolls as it is conducted past the impingement drying unit, and which impingement drying unit comprises at least one impingement surface, the side profile of which is straight, changeably curved in its radius of curvature, in the shape of a broken line or a selectable combination of these, wherein the impingement surface or a tangent to the impingement surface or a line passing via a beginning and an end of the impingement surface or an extension of said line or the centre line or the symmetry line of the impingement drying unit forms, on the impingement side, an angle with a horizontal plane parallel to the machine level, which angle is in a range of 120°–60°, in which connection the impingement surface or the impingement drying unit is in a substantially upright position, that at least one impingement drying device acts on at least one impingement surface, which is defined by the outer surface of the drying fabric running in the impingement drying unit, in which connection impingement acts directly on the web, and that the impingement drying unit is disposed to form part of the drying group or between two drying groups or after the drying groups.