A method for the detection of a break of a fibrous web in a section of a machine for the production of the fibrous material web and apparatus for carrying out the method

摘要

The invention relates to a method for detection of a break of a fibrous web (3) in a section (2) of a machine (1) for the production of the fibrous material web (3), wherein the fibrous material web (3) by means of at least one ground-carrier having at least a plurality of components (5) through the section (2) is guided, the tearing off by means of at least one optical device (8) to the web break detecting, the at least one light source (11) and a detector (14), is detected and wherein a knock-off device (9) for the fibrous material web (3) by means of the device (8) to the web break detecting is activated directly or indirectly.The method according to the invention is characterized in that the of the fibrous material web (3) and / or of at least one constituent of ground-carrier (2) reflected intensity (i_R) of the light source (11) in a wavelength range (l) between 800 to 2600 nm by means of the detector (14) is measured, by a tearing off of the fibrous material web (3) is to reliably detect.Furthermore, the invention relates to a device (10) for carrying out the method according to the invention.