Apparatus on a spinning preparation for detecting foreign objects of plastic material

摘要

A detection apparatus in spinning preparation for detecting foreign objects of plastics material in or amongst fiber material. The apparatus includes a source of polarised light and a transport arrangement for transporting the fiber material such that the fiber material is irradiated by the polarized light source. An analyzer is arranged to render visible any change in a plane of polarization caused by the irradiation of the foreign objects of plastics material in or amongst the fiber material and a detector device is arranged to capture an image of contrast differences and/or color shifts in the fiber material rendered visible by the analyzer. The detection apparatus further includes an evaluating unit arranged to process the image to identify the foreign objects for removal.