| 摘要 |
An apparatus in spinning preparation for detecting foreign objects of plastics material, such as polypropylene bands, fabric and films and the like, in or among fibre flocks, for example, of cotton, that are being removed (opened) from bales of textile fibre, comprises a foreign object detector, which detector and the fibre flocks are movable relative to one another. The foreign object detector comprises a transmitter and a receiver for electromagnetic waves or rays and an evaluating device for distinguishing the foreign objects from the fibre flock. To produce an improved apparatus, a source of polarised light that cooperates with at least one detector device (camera) acts on the fibre material (fibre flocks, fibre flock web), the fibre material being irradiated, with light passing through light-coloured and/or transparent sheet-form foreign objects of plastics material, and the detector device is capable of distinguishing sheet-form from fibrous foreign objects on the basis of its resolution.
|
