Method of reducing shrinkage during drying of a paper web
CA 1340148 C · Owner: Busker, Leroy H. · Inventors: Cronin, Dennis; Busker, Leroy H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for reducing shrinkage during drying of a paper web formed from paper stock. The method includes the steps of adding a surfactant to the paper stock prior to forming the stock into the paper web. The surfactant is dispersed throughout the stock such that the surfactant is intimately mixed with the stock. The surfactant mixed with the stock is supplied to a headbox of a paper forming section and the mixture of stock and surfactant is ejected from the headbox onto a forming wire of the forming section. A first portion of water is drained from the stock such that the paper web is formed on the forming wire. The paper web is led from the forming section to an extended nip …
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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
- Granted December 1, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 2015.
- 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
Timeline From CIPO dates
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.