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

US11926963B2 · kind B2 · utility

Assignee

• Voith Patent GmbH · DE

Inventors

• Jan Achtermann · Schneris, DE
• Marcus Schwier · Meckenbeuren, DE
• Marco Popp · Weismain, DE
• Juergen Schaefer · Oberhaching, DE

Key dates

• Filing date: Nov 20, 2018
• Grant date: Mar 12, 2024
• Expiry date: Jul 3, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/34
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining the dryness of a fibrous web, in particular a tissue web, during the production of the fibrous web, is carried out in a machine including a drying cylinder, in particular a Yankee cylinder, to which at least one, preferably two, dryer hoods are assigned, and a reel-up for winding up the fibrous web. The determination of the dryness of the fibrous web is carried out before the drying cylinder on the basis of measured values which describe the following variables: the amount of solids in the fiber web at the reel-up, the amount of water in the fiber web at the reel-up, and the amount of water which is evaporated in the dryer hood or hoods. A method for controlling or regulating a machine for producing a fibrous web, a computer program and computer program product are also provided.