US 11,926,963 B2
Method for determining the dryness of a fibrous web, and method for controlling or regulating a machine for producing a paper web, and computer program for carrying out the methods
Jan Achtermann, Horgenzell (DE); Marcus Schwier, Meckenbeuren-Brochenzell (DE); Marco Popp, Weismain (DE); and Juergen Schaefer, Ravensburg (DE)
Assigned to Voith Patent GmbH, Heidenheim (DE)
Appl. No. 16/767,360
Filed by VOITH PATENT GMBH, Heidenheim (DE)
PCT Filed Nov. 20, 2018, PCT No. PCT/EP2018/081831
§ 371(c)(1), (2) Date May 27, 2020,
PCT Pub. No. WO2019/101701, PCT Pub. Date May 31, 2019.
Claims priority of application No. 10 2017 127 932.6 (DE), filed on Nov. 27, 2017.
Prior Publication US 2020/0385927 A1, Dec. 10, 2020
Int. Cl. D21F 7/00 (2006.01); D21F 5/18 (2006.01); D21F 7/12 (2006.01); D21F 11/14 (2006.01); D21G 9/00 (2006.01); D21H 27/00 (2006.01); G01N 33/34 (2006.01)
CPC D21F 7/003 (2013.01) [D21F 5/181 (2013.01); D21F 7/12 (2013.01); D21F 11/14 (2013.01); D21G 9/0036 (2013.01); D21H 27/002 (2013.01); G01N 33/34 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for determining the dryness of a fibrous web or a tissue web during the production of the fibrous web in a machine, the method comprising the following steps:
providing a machine including a drying cylinder or Yankee cylinder, at least one dryer hood associated with the drying cylinder, and a reel-up for winding up the fibrous web; and
determining the dryness of the fibrous web before the drying cylinder based on measured values describing the following variables:
a) an amount of solids in the fibrous web at the reel-up;
b) an amount of water in the fibrous web at the reel-up; and
c) an amount of water evaporated in the at least one dryer hood.