Accurate tracking of web features through converting processes
US8060234B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 24, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Apr 23, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2557/62
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.