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US 7,444,862 B2Granted
Web tension profile measuring method and roll applying the same
AssigneeMetso Paper, Inc.
InventorsMatti Innala, Jorma Kinnunen, Jussi Koskelainen, Tatu Pitkänen, Petteri Lannes, Markus Nylund, Marko Tiilikainen, Jyrki Saloniemi, Reijo Huuskonen
Life of this patent
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Abstract
A method and a roll for measuring a tension profile is provided. The roll has planted on its surface a spirally helical pressure-sensitive film sensor, such as an EMFi pressure-sensitive film sensor, which makes contact with a web obliquely and which, co-directionally with the web, has a measuring range which is substantially equal to or shorter than a web overlap angle when the roll is used for measuring a lateral tension profile of the web.
Claims16
A method for measuring a lateral tension profile of a fibrous web, comprising:
- placing at least one pressure-sensitive film sensor on a roll in a helical configuration with respect to a surface thereof;
- covering the at least one pressure-sensitive film sensor with a covering selected from group consisting of a coating over the roll and a tubular protective skin placed over the roll;
- and
- measuring a force exerted by the web on the roll using the at least one pressure-sensitive film sensor, the roll having the web wrapped at least partially thereabout such that contact therebetween defines an overlap angle, the at least one pressure-sensitive film sensor having at least one active zone for measuring the force exerted by the web, the at least one pressure-sensitive film sensor being further configured to be disposed substantially completely within the overlap angle during a first portion of each revolution of the roll, and then substantially completely within an open space on the surface of the roll, outside the overlap angle, during a second portion of each revolution of the roll.
1 more element
A method for measuring a lateral tension profile of a fibrous web, comprising:
- engaging at least one pressure-sensitive film sensor with a covering selected from the group consisting of a protective film and a tubular stocking;
- placing covering on a roll such that the at least one pressure-sensitive film sensor is disposed in a helical configuration with respect to a surface of the roll;
- and
- measuring a force exerted by the web on the roll using the at least one pressure-sensitive film sensor, the roll having the web wrapped at least partially thereabout such that contact therebetween defines an overlap angle, the at least one pressure-sensitive film sensor having at least one active zone for measuring the force exerted by the web, the at least one pressure-sensitive film sensor being further configured to be disposed substantially completely within the overlap angle during a first portion of each revolution of the roll, and then substantially completely within an open space on the surface of the roll, outside the overlap angle, during a second portion of each revolution of the roll.
1 more element
A method for controlling a web of a printing press, comprising:
- measuring a lateral tension profile of a fibrous web by measuring a force exerted by the web on a roll using at least one pressure-sensitive film sensor disposed in a helical configuration in contact with a surface of the roll, the roll having the web wrapped at least partially thereabout such that contact therebetween defines an overlap angle, the at least one pressure-sensitive film sensor having at least one active zone for measuring the force exerted by the web, the at least one pressure-sensitive film sensor being further configured to be disposed substantially completely within the overlap angle during a first portion of each revolution of the roll, and then substantially completely within an open space on the surface of the roll, outside the overlap angle, during a second portion of each revolution of the roll;
- and
- actively regulating air pressure of turning bars of the printing press in response to the measured lateral tension profile.
A method for controlling a tension profile of a web, comprising:
- measuring a lateral tension profile of a fibrous web by measuring a force exerted by the web on a roll using at least one pressure-sensitive film sensor disposed in a helical configuration in contact with a surface of the roll, the roll having the web wrapped at least partially thereabout such that contact therebetween defines an overlap angle, the at least one pressure-sensitive film sensor having at least one active zone for measuring the force exerted by the web, the at least one pressure-sensitive film sensor being further configured to be disposed substantially completely within the overlap angle during a first portion of each revolution of the roll, and then substantially completely within an open space on the surface of the roll, outside the overlap angle, during a second portion of each revolution of the roll;
- and
- adjusting a tension profile regulator, the tension profile regulator comprising at least one of a spray nozzle and a steam box, in response to the measured lateral tension profile.
A method for feeding a web, comprising:
- measuring a lateral tension profile of the web by measuring a force exerted by the web on a roll using at least one pressure-sensitive film sensor disposed in a helical configuration in contact with a surface of the roll, the roll having the web wrapped at least partially thereabout such that contact therebetween defines an overlap angle, the at least one pressure-sensitive film sensor having at least one active zone for measuring the force exerted by the web, the at least one pressure-sensitive film sensor being further configured to be disposed substantially completely within the overlap angle during a first portion of each revolution of the roll, and then substantially completely within an open space on the surface of the roll, outside the overlap angle, during a second portion of each revolution of the roll, so as to provide a determination selected from the group consisting of an identification of a location of a ribbon having the at least one pressure-sensitive film sensor wherein the ribbon is narrower than the web, and a measurement of at least one of a tension profile, a tension, and a width of the ribbow;
- and
- at least one of adjusting a tension of a web feeding leader by varying at least one of a speed and momentum of the roll, and adjusting a tension of a web feeding rope by varying an electrical drive of a rope pulley.
An apparatus for measuring a tension profile of a web, comprising:
- a pressure-sensitive film sensor disposed in a helical configuration on a surface of a roll, the pressure-sensitive film sensor being configured to obliquely contact the web wrapped at least partially about the surface of the roll such that contact therebetween defines an overlap angle, the pressure-sensitive film sensor being further configured to extend co-directionally with the web about the surface of the roll for no greater than the overlap angle so as to be capable of measuring a lateral tension profile of the web;
- and
- a protective layer covering the pressure-sensitive film sensor.
Dependencies are inferred from the claim text.