Method and device in the press section of a paper machine for the control of the nip-pressure profile
CA 2018317 C · Owner: Valmet Paper Machinery Inc. · Inventors: Uuttana, Kyosti; Niskanen, Tapio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus in the press section of a paper machine for regulating the axial linear-load profiles in its nip or nips (N1,N2,N3). The axial temperature profile(s) of the outer mantle(s) of a press roll or rolls (11 13, 16, 17) is/are, regulated. Thereby the distribution of the diameter of the press roll in the axial direction is controlled on the basis of thermal expansion. Also thereby, the distribution in the transverse direction of the machine of the linear load in the press nip or nips (N1,N2,N3) formed by the press roll or rolls (11 13, 16, 17), is affected. The temperature profile of the outer mantle(s) (11' 13', 17') of the press roll or rolls (11 13, 17) is regulated by a, …
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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 June 5, 1990 and granted November 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.