Method and apparatus for detecting defects in a moving web
US5949550A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Aug 21, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/0066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting patches or areas of relatively high gloss on a moving web, and thereby associated wrinkles or other defects, and signalling the presence thereof comprises an analog and/or digital optical reflectivity sensor for sensing gloss on the surface of the moving web, a web marking device adjacent the edge of the moving web for marking the edge of the web with a dye, and a microcomputer for receiving the output signal from the sensor(s) and for controlling the operation of the marking device. The apparatus may also include a warning device such as a light or horn. The apparatus and method have particular applicability in association with paper web re-reeling equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.