Measuring the surface roughness of a moving sheet material
US4019066A · kind A · utility
54Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Mar 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is concerned with measuring "on-line" the surface roughness of a moving sheet material, e.g. a paper web. The method comprises illuminating the moving web, preferably at a low angle, suitably collecting the light reflected from the moving web and processing the light by means of a sensitive photo-electrical system. The electrical signals thus obtained are divided into an AC and a DC component, the components are separately measured and their ratio used as an index of roughness. An apparatus for carrying out roughness measurements on a moving paper web, e.g. on a paper machine, is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.