Infrared measurement of paper machine clothing condition
US7938935B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2007 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Oct 22, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Infrared spectroscopy techniques are employed to measure (i) the moisture level in both the sheet of wet stock and the papermaking machine clothing on which the sheet is supported and (ii) the moisture level in the clothing alone as a separate layer of material. Differential measurement thus yields the moisture content of the sheet of wet stock alone. Changes in the moisture level in the clothing at the press section can be correlated with corresponding changes in the quality or physical property of the paper produced. Both fixed point and scanning IR sensors are strategically positioned in the press section to generate machine direction and/or cross machine direction water profiles for process control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.