Patent · US Active

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

US7942057B2 · kind B2 · utility

0Cited by

10References

13Claims

0Family size

Assignee

Stora Enso AB · SE

Inventors

Thorulf Pettersson · Bissenkamp, SE
Jan Lif · Fållan, SE
Magnus Björklund · Gothenburg, SE
Susanne Lindh · Avesta, SE

Key dates

Filing date	Dec 20, 2006
Grant date	May 17, 2011
Priority date	—
Expiry date	Feb 19, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/2632
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.