Electronic imaging and quality control method for a fast moving web
OwnerHannu Ruuskainventor
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Abstract
The invention relates to a method for imaging and analysing the formation and surface topography of a fast-moving web or for the statistical analysis of impurities and spots. An electronic matrix camera is used to take images of a web moving at least 5 m/s, the exposure time of the electronic shutter of the camera being adjusted so that the sum of the static pixel size of the web and the dynamic imaging inaccuracy caused by movement is at most about 0.6 mm in the direction of travel. The exposure time is shorter than 25 μs.
Claims6
A method for imaging a fast-moving web for the purpose of imaging and analysing the surface topography, or for the statistical calculation of impurities and spots, characterised in that for image formation is used a matrix camera so that the image exposure time is shorter than 25 μs.
Dependencies are inferred from the claim text.