Impingement drying unit and a dryer section
First Claim
1. 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°
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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.
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for a dryer section of a paper or board machine has a drying group (R) and an impingement drying unit (10) which is placed above and/or below a row (DSR) of drying cylinders (3). A drying fabric (1) supported paper or board web (2) is conducted past the impingement drying unit (10) having at least one impingement surface (IP1, IP2) 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, and that the impingement surface or a tangent line to the impingement surface or a line passing via the beginning and the end of the impingement surface or an extension of the line forms on the impingement side an angle with a horizontal plane parallel to the machine level, which angle is ≦120°, advantageously 120°–60°, most advantageously about 90°.
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Citations
30 Claims
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1. 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°
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A dryer section of a machine making a fibrous web, which comprises at least one drying group applying single-wire draw or twin-wire draw and comprising at least one impingement drying unit extending above and/or below a row of drying cylinders for drying the web, and a drying fabric on whose support the web is conducted past the impingement drying unit, the drying fabric extending between at least two vertically spaced support rolls as it is conducted past the impingement drying unit, the impingement drying unit comprising 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 line 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 a symmetry line of the impingement dying unit forms, on the side of impingement, an angle with a horizontal plane parallel to a machine level, which angle is in a range of 120°
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60°
,in which connection the impingement surface or the impingement drying unit is in a substantially upright position, wherein at least one impingement drying device acts on at least one impingement surface, which is defined by an 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 dryer section. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A dryer section in a paper or board machine for making a paper or board web, the dryer section comprising:
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at least a first drying group having a row of drying cylinders for drying the web, the dryer section having a horizontal plane which is parallel to a machine level; at least one impingement drying unit extending above or below the row of drying cylinders, the impingement drying unit having at least one impingement drying device which has at least one impingement surface extending between at least two vertically spaced support rolls, wherein the impingement surface defines a first angle with a horizontal plane parallel to the machine level, which angle is in a range of 120°
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60°
; anda drying fabric on whose support the web is conducted past the at least one impingement drying device impingement surface, such that impingement acts directly on the web. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification