Device for determining and storing eccentricity of customer roll within a slitter winder and using for unwinding control

A slitter-winder comprising:

• an unwinding section for unwinding a fiber web from a parent roll;
• a slitting section for slitting the fiber web to component fiber webs;
• a winding section, which comprises a winder for winding the component fiber webs around winding cores to customer rolls;
• and
• inside at least one of the winding cores at least one measuring device releasably fastened by at least one fastening element within the at least one of the winding cores, and thereby fastened to rotate with the winding core during winding of the customer roll around the winding core, the measuring device comprising at least two sensors, which are configured to measure movement, speed and/or acceleration;
• a data storage which records the measured movement, speed and/or acceleration as the customer roll is wound, wherein the measuring device is configured to be fastened releasably against an inner surface of the winding core before the winding core is placed in the winder and configured to be removed from the winding core, when the finished customer roll has been removed from the winder.

An apparatus for determining, storing, and retrieving for future use the eccentricity over time of a customer roll as it is formed on a slitter-winder having an unwinding section for unwinding a fiber web from a parent roll, a slitting section for slitting the fiber web to component fiber webs, and a winding section having a winder for winding the component fiber webs around winding cores to customer rolls, the cores having axial openings, the apparatus comprising:

• a frame which is receivable within a winding core axial opening;
• at least one fastening element on the frame which is actuatable to releasably engage a winding core for rotating with the winding core during winding of the customer roll around the winding core;
• at least two sensors on the frame which are configured to measure movement, speed and/or acceleration to determine data from which the eccentricity of the customer roll with time is calculated;
• and
• a data storage element which stores the data, such that the eccentricity of the customer roll at a position along a web wound on the customer roll can be recalled during the later processing of the customer roll.