Global Patent Index - EP 2022893 A2

EP 2022893 A2 2009-02-11 - Method for identifying a break in a sheet of fibrous material in a section of a production machine for fibrous sheet material and device for implementing the method

Title (en)

Method for identifying a break in a sheet of fibrous material in a section of a production machine for fibrous sheet material and device for implementing the method

Title (de)

Verfahren zur Erfassung eines Abrisses einer Faserstoffbahn in einer Sektion einer Maschine zur Herstellung der Faserstoffbahn und Vorrichtung zur Durchfühung des Verfahrens

Title (fr)

Procédé destiné à détecter un condensé d'une bande fibreuse dans une section d'une machine destinée à la fabrication d'une bande fibreuse et dispositif destiné à la réalisation du procédé

Publication

EP 2022893 A2 (DE)

Application

EP 08161037 A

Priority

DE 102007034828 A

Abstract (en)

The method involves guiding a web (3) by using a web carrier (5) e.g. dryer fabric, which includes several components by a section. A break of the web is detected by an optical device (8) for web break detection. A cut-off device (9) for the web is activated directly or indirectly by the optical device for the web break detection. An intensity (IR) of a light source (11) e.g. lamp, of the optical device in a wavelength range (L) between 800 to 2,600 nanometer reflected by the web and/or one component of the carrier is measured by using a detector (14) of the optical device. An independent claim is also included for a device for detection of a break of a web in a section of a machine for production of the web.

Abstract (de)

Die Erfindung betrifft ein Verfahren zur Erfassung eines Abrisses einer Faserstoffbahn (3) in einer Sektion (2) einer Maschine (1) zur Herstellung der Faserstoffbahn (3), wobei die Faserstoffbahn (3) mittels wenigstens eines zumindest mehrere Bestandteile aufweisenden Bahnträgers (5) durch die Sektion (2) geführt wird, wobei der Abriss durch mindestens eine optische Einrichtung (8) zur Bahnabrisserfassung, die mindestens eine Leuchtquelle (11) und einen Detektor (14) umfasst, erfasst wird und wobei eine Abschlagvorrichtung (9) für die Faserstoffbahn (3) durch die Einrichtung (8) zur Bahnabrisserfassung direkt oder indirekt aktiviert wird. Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass die von der Faserstoffbahn (3) und/oder von wenigstens einem Bestandteil des Bahnträgers (2) reflektierte Intensität (I R ) der Leuchtquelle (11) in einem Wellenlängenbereich (L) zwischen 800 bis 2.600 nm mittels des Detektors (14) gemessen wird, um einen Abriss der Faserstoffbahn (3) zuverlässig zu erfassen. Weiterhin betrifft die Erfindung eine Vorrichtung (10) zur Durchführung des erfindungsgemäßen Verfahrens.

IPC 8 full level (invention and additional information)

D21F 7/04 (2006.01)

CPC (invention and additional information)

D21F 7/04 (2013.01)

Citation (applicant)

DE 4216653 A1 19931125 - VOITH GMBH J M [DE]

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA MK RS

EPO simple patent family

EP 2022893 A2 20090211; EP 2022893 A3 20111221; EP 2022893 B1 20121219; DE 102007034828 A1 20090129

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