Method and a system for monitoring structural changes of a fiber web

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United States of America Patent

PATENT NO 7942057
APP PUB NO 20090120190A1
SERIAL NO

12158525

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Abstract

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A method for monitoring the structural state of a fiber web (1) that is being processed by a fiber web processing machine comprising a fiber web processing station (2) is described. The method comprises the steps of arranging a generator (5) and a detector (6) of a generator-detector unit (4) on opposite sides of the traveling fiber web (1) downstream of the fiber web processing station; bringing the generator to emit an ultrasonic wave; bringing the detector to receive the ultrasonic wave; sending a signal representing the received ultrasonic wave to a control unit (10); and, in the control unit, analyzing the signal and extracting a value from the signal representing a measure of the received ultrasonic wave. A system for monitoring the structural state of a fiber web is also described.

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Patent Owner(s)

Patent OwnerAddress
STORA ENSO ABS-791 80 FALUN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Björklund, Magnus Karlstad, SE 11 4
Lif, Jan Hammarö , SE 2 1
Lindh, Susanne Avesta, SE 1 0
Pettersson, Thorulf Täby, SE 3 40

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