Method and apparatus for measuring paper color
AssigneeMetso Paper Automation Oy
InventorHannu Moisio
Life of this patent
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Abstract
The invention relates to a method and apparatus for measuring paper color. Paper color is measured from the surface of a paper roll on a winder. As the size of the paper roll grows, a measuring device is moved in such a way that the angle between the measuring device and the surface of the paper roll is kept substantially constant and, at the same time, the distance of the measuring device from the surface of the paper roll remains substantially constant
Claims11
A method for measuring the color of paper during a winding operation of a paper roll in a winder, the method comprising:
- positioning a measuring device at a predetermined distance from an outer surface of a paper roll;
- positioning the measuring device to define a predetermined angular relationship with the outer surface of the paper roll;
- moving the measuring device so as to maintain the distance and the angular relationship between the measuring device and the paper roll constant as the paper roll changes diameter during the winding operation.
An apparatus for measuring the color of paper during a winding operation of a paper roll in a winder, the apparatus comprising:
- a measuring device which is positioned at a predetermined distance from an outer surface of a paper roll, said measuring device defining a predetermined angular relationship with the outer surface of the paper roll;
- means for maintaining the angular relationship between the measuring device and the surface of the paper roll constant as the paper roll changes diameter during the winding operation;
- and
- means for maintaining the distance between the measuring device and the paper roll constant as the paper roll changes diameter during the winding operation.
Dependencies are inferred from the claim text.