Quality measurement method and quality measurement device for long sheet material
US11231363B2 · kind B2 · utility
8Cited by
2References
6Claims
0Family size
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Key dates
| Filing date | May 31, 2018 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | May 31, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0655
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The quality measurement method for a long sheet material W includes measuring cellulose fibers, % moisture, and % ash of the paper web W by using area cameras 1102 to 1106 having an infrared light receiving element and a light source 1100 having an infrared light emitting LED element. Performance check for the infrared cameras 1102 to 1106 over the entire width and correction of measured values are performed by using consistency between measured values for the same point in an overlap area measured by adjacent cameras and reference samples 1107 at the off-sheet positions provided at both sides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.