Method and apparatus for controlling a fiber fractionation system
AssigneeInternational Paper Company
InventorsJyrki Tapio Jaakkola, Antti Heikkinen
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Abstract
A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers includes measuring an average LF fiber length at one or more locations post-fractionation, and maintaining the average LF fiber length within a target variability range by automatically altering a rotational speed of a rotor of the fiber fractionation system.
Claims36
A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers, the method comprising:
- measuring one or more properties of a furnish formed by mixing the LF stream and the SF stream;
- and
- maintaining at least one of the one or more measured furnish properties within a respective target range by automatically altering a rotational speed of a rotor of the fiber fractionation system in response to the measured one or more properties of the furnish.
A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers, the method comprising:
- measuring one or more properties of a moving web;
- and
- maintaining at least one of the one or more measured moving web properties within a respective target range by automatically altering the rotational speed of the rotor of the fiber fractionation system in response to the measured one or more properties of the moving web.
A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers, the method comprising:
- measuring one or more properties of a finished sheet;
- and
- maintaining at least one of the one or more measured finished sheet properties within a respective target range by automatically altering a rotational speed of a rotor of the fiber fractionation system in response to the measured one or more properties of the finished sheet.
Dependencies are inferred from the claim text.