With the improvement of processing technology and electronic level, it has become possible to remove white impurities in raw cotton on the open cleaning machine. The Italian Loptex company has improved the de-dusting machine equipped with a photodetector, and recently developed a de-dusting machine that can detect white impurities in the raw cotton, and greatly improved the impurity removal effect and detection efficiency.
The new type of de-dusting machine designed by the Italian company Loptex is based on the idea that the impurities and the original cotton differ in color and brightness, and an optical sensor is used as the detector. Since most of the impurities are darker than the original cotton and can absorb more light, the color is darker and can be detected by the optical sensor, but some white or impurities whose color is close to the original cotton color are difficult to detect.
These chemical fiber-based impurities are derived from chemical fiber strips or fabrics woven from chemical fiber strips. When the raw cotton contains these impurities, they are torn into fiber bundles or single fibers in the opening and cleaning process. These fibrous impurities behave almost identically to all aspects of cotton fibers, and are easily spun into yarns through various decontamination devices. Usually these materials contain polypropylene, which is sometimes colored, but is usually clear and colorless. Since such impurities cannot be detected by the usual photoelectric method, many studies on such impurities have been made in order to find a good detection method.
Using the principle of acoustic reflection, the Italian company Loptex has previously improved the de-dusting machine with only a photodetector, plus an ultrasonic detector. Now the new Optosonic machine with ultrasonic detector is launched by Loptex under the name "Optical Ultrasonic Cleaner", which allows the raw cotton to be tested by ultrasonic detectors and photodetectors.
Compared with the photoelectric detection in which two sets are installed, only one ultrasonic detector can be installed, because most of the sound waves can penetrate the original cotton in the open state. At the same time, an acoustic absorption device is mounted opposite the ultrasonic detector to prevent sound waves passing through the cotton fibers from being reflected back from the opposite metal wall. Ultrasonic testing and photodetection, the application of these two different principles of detection methods have a great overlap. For example, colored chemical fiber impurities, or non-chemical fiber impurities with a hard surface structure, are detected when passing through both detectors. This makes the machine not only strengthen the detection of colored impurities and colorless impurities, but also enhances the impurity removal effect of the machine, and greatly improves the overall detection efficiency.
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