G - Physics – 01 – N
Patent
G - Physics
01
N
340/123.4
G01N 21/89 (2006.01)
Patent
CA 1223935
ABSTRACT OF THE DISCLOSURE The present invention provides a procedure of detecting streaks extending in the machine direction of a paper web in which the paper web is moved continuously in said direction and the detecting is carried out with the use of a measuring box having a path of travel in a direction transverse to that of the movement direction of the web, said box being provided with means for producing a number of mutually spaced light beams of substantially equal intensi- ties spaced from each other in the direction of the path of travel of the box, and said box being further provided with a number of detectors adapted to measure the intensities of light beams entering the box, the detection comprising the steps of moving the measuring box along its path of travel across the moving web, producing the number of light beams and directing the light beams from the measuring box to the web, reflecting the light beams which have met the web to the detectors in the measuring box and measuring the inten- sities of the reflected beams so that a streak in the machined direction of the web is detected as a sequence of similar disturbances in the intensities measured by the dif- ferent detectors, caused by sequential crossing of the mutually spaced light beams and the detectors over the streak. The present invention also provides an apparatus for use in the process.
458497
Enso-Gutzeit Oy
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