Accurate tracking of web features through converting processes
First Claim
1. A system for locating a defect of a moving sheet having naturally varying properties during first and second sheet making processes, said system comprising:
- a processor capable of executing code stored on a non-transitory medium, said code configured to;
process a first digital representation of one lane of a reel produced from said moving sheet during said first sheet making process and a second digital representation of said one lane of said reel during said second sheet making process;
obtain from said first digital representation a first pattern of the naturally varying properties of said moving sheet during said first sheet making process;
obtain from said second digital representation a second pattern of the naturally varying properties of said moving sheet during said second sheet making process; and
locate said sheet defect during said second sheet making process by correlating said first and said second patterns.
2 Assignments
0 Petitions
Accused Products
Abstract
There is described a method and apparatus for tracking the location of web features through a converting process, one application of which can involve tracking paper defects from a paper machine as detected by a camera system, to a winder where the sheet is wound to rolls so that the web defects can be repaired in the winder before making the rolls. The method to track web features is based on pattern identification of inherent sheet variability or defects. The apparatus involves two or more sheet property or defect monitoring web sensors arranged at the same cross directional location at different stages of the converting operation, augmented by tachometers and/or roll diameter sensors. A full automation system for drive control on the winder based on this information is preferably added to make maximum advantage of this information.
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Citations
20 Claims
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1. A system for locating a defect of a moving sheet having naturally varying properties during first and second sheet making processes, said system comprising:
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a processor capable of executing code stored on a non-transitory medium, said code configured to; process a first digital representation of one lane of a reel produced from said moving sheet during said first sheet making process and a second digital representation of said one lane of said reel during said second sheet making process; obtain from said first digital representation a first pattern of the naturally varying properties of said moving sheet during said first sheet making process; obtain from said second digital representation a second pattern of the naturally varying properties of said moving sheet during said second sheet making process; and locate said sheet defect during said second sheet making process by correlating said first and said second patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for tracking features of a moving sheet having naturally varying properties, the method comprising:
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detecting a defect in said sheet during a first sheet making process; obtaining a first pattern of the naturally varying properties of said sheet during said first sheet making process; obtaining a second pattern of the naturally varying properties of said sheet during a second sheet making process; and locating said defect during said second sheet making process by correlating said first and said second patterns. - View Dependent Claims (12, 13, 14, 15)
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16. A computer program product stored on a non-transitory media for tracking features of a moving sheet having naturally varying properties, said computer program product comprising:
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computer usable program code configured to obtain a sheet defect signal during a first sheet making process; computer usable program code configured to obtain a first pattern of the naturally varying properties of said moving sheet during said first sheet making process; computer usable program code configured to obtain a second pattern of the naturally varying properties of said moving sheet during a second sheet making process; and computer usable program code configured to locate said sheet defect during said second sheet making process by correlating said first and said second patterns. - View Dependent Claims (17, 18, 19, 20)
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Specification