Method and device for detecting foreign matter in a fibre assembly which is moved lengthwise
US6771365B1 · kind B1 · utility
19Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2001 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/365
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and a device for detecting foreign matter in a fibre composite moving in the longitudinal direction and consisting substantially of wool or cotton fibres. To provide an improved, easier and rapid method of detecting polypropylene in fibres intended for textile products the fibre composite is irradiated with infrared light (2, 3) in a defined wavelength range, the reflected light filtered (13) and the filtered fraction of the light measured (11). Values which significantly deviate from a base value indicate the presence of foreign matter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.