Method and apparatus for monitoring of the dry line in a fou drinier paper machine and for control based thereupon
CA 2483877 A1 · Owner: Niemi, Antti · Inventors: Niemi, Antti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to observe the dry line formed on the surface of wood fibre pulp on the mov~ing wire in a Fourdrinier paper machine its- atrea of appearance is , scanned at a low an~gle with a thin beam cluster (A1,B1) which being , generated by a laser radiation source (20) and representing one or more discrete wavelengths, is distinguishable from the background light. Hereby the surface following the dry line (I) reflects diffusively a major part and specularly a minor part of the arriving radiation than the surface preced~ing it. A detector (30) located above the level of the wire observes the intensity of the diffusely reflected radiation (A3,B3) hitting it and delivers continuously, as …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2025.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.