Dryer section

• US 5,184,408 A
• Filed: 01/19/1990
• Issued: 02/09/1993
• Est. Priority Date: 01/19/1990
• Status: Expired due to Fees

• Current Assignee: J.M. Voith GmbH (Voith GmbH & Co. KGaA)
• Original Assignee: J.M. Voith GmbH (Voith GmbH & Co. KGaA)
• Inventors: Kotitschke, Gerhard, Kugler, Georg
• Primary Examiner(s): Bennet, Henry A.
• Application Number:
  US07/467,788
• Time in Patent Office: 1,117 Days
• Field of Search: 34/117, 34/120, 34/116, 34/123, 34/113, 34/115
• US Class Current: 34/117
• CPC Class Codes: D21F 5/042 in combination with suction or blowing devices
• CPC Class Codes: D21G 9/0063 Devices for threading a web tail through a paper-making machine

Abstract

A dryer section with two dryer groups and a transfer for the paper web between the dryer groups. The receiving dryer group has a vacuum roll on which the felt of the proceeding dryer group is partially wrapped. An adjusting mechanism enables the wrap angle to be adjusted between an arc angle of 0 and 20 degrees.

Claims

1. A dryer section of a machine for manufacturing fiber webs, wherein:

(a) the dryer section comprises a plurality of heatable drying cylinders arranged to form at least a first dryer group and a second dryer group, and arranged in horizontal cylinder rows, and including at least one suction roll allocated to each drying cylinder;

(b) a first and a second endless support belt, each dryer group has a respective one of the first and second endless support belt for supporting the fiber web, with the support belt and the fiber web traveling alternately over the drying cylinders and over the suction rolls so that the fiber web comes into direct contact with the drying cylinders and the support belt comes into direct contact with the suction rolls;

(c) in the first dryer group a first side of the web contacts the drying cylinders, and a second side of the web contacts the support belt;

(d) in the second dryer group, following the first dryer group, the second side of the web contacts the drying cylinders, and the first side of the web contacts the support belt;

(e) within each said second dryer group, at an upstream end thereof, one of the suction rolls is arranged to assume the function of a pick-up roll for transferring the fiber web from the first to the second dryer group such that the second support belt is capable of contacting the first support belt only at a portion comprising an arc angle "a" of the periphery of said pick-up roll, the first and second support belts extending to converge toward each other and to form a wedge-like gap at said pick-up roll of a predetermined angle; and

(f) adjusting means for adjusting the size of the arc angle "a" between zero and 20°

, said adjusting means comprising a belt roll, leading the first support belt and position downstream of said pick-up roll, said belt roll being shiftable to adjust the size of the arc angle "a", said pick-up roll having a prolonged suction zone or a separate pre-suction zone at the side where the associated support belt is received to suction off air layers carried into said wedge-like gap by said belts.