Dryer section in a paper or board machine including an arrangement for cutting at least one of a leader of a web
AssigneeValmet Corporation
InventorsIsmo Koponen, Iimari Rintasalo, Jari Vainio, Juha Kaihovirta
Life of this patent
Estimating the term…
Abstract
A method for cutting the leader of the web in a paper or board machine in the dryer section of the machine by a jet of pressurized water. The web is placed against the drying wire when it is being cut, and the jet is directed at the web from the free side of the web. The water jet pressure used is from about 40 bar to about 400 bar, preferably from about 100 bar to about 350 bar, which is produced by an ordinary pressure washer.
Claims20
A dryer section in a paper or board machine including an arrangement for cutting at least one of a leader of a web and a diagonal tail portion of a web, the web having first and second opposed faces, comprising
- a plurality of cylinders, at least one of said cylinders being structured and arranged to support the web in a run along which said first face of the web is in contact with said at least one cylinder and said second face of the web is exposed,
- at least one drying wire for carrying the web through the dryer section, and
- water jet means arranged in opposed relationship to said second face of the web along said supported run of the web in which said first face of the web is in contact with said at least one cylinder and said second face of the web is exposed for directing a pressurized water jet at said second face of the web at a location along said supported run of the web to cut the web, said water jet having a pressure from about 40 bar to about 400 bar.
A dryer section in a paper or board machine including an arrangement for cutting at least one of a leader of a web and a diagonal tail portion of a web, the web having first and second opposed faces, comprising
- a plurality of heated drying cylinders, one of said plurality of drying cylinders being structured and arranged to support the web in a run along which said first face of the web is in contact with said drying cylinder and said second face of the web is exposed,
- at least one drying wire for carrying the web through the dryer section and into contact with said plurality of drying cylinders, and
- water jet means arranged in opposed relationship to said second face of the web along said supported run of the web in which said first face of the web is in contact with said drying cylinder and said second face of the web is exposed for directing a pressurized water jet having a pressure from about 40 bar to about 400 bar at said second face of the web at a location along said supported run of the web to cut the web.
Dependencies are inferred from the claim text.