Optical Sorting Machine Manufacturers
Connect with verified optical sorting machine manufacturers on Towobo. Source multispectral and NIR optical sorters, vision-based inspection systems, and X-ray food inspection equipment for commercial food defect detection, contaminant removal, and quality sorting.
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Browse Optical Sorting Machine Suppliers →Optical sorting machines — technologies and food applications
Optical sorting machines use cameras, light sensors, and image analysis software to detect and remove defective, off-colour, or contaminated product items. Modern optical sorters use multiple sensing technologies to detect a wide range of defects: visible spectrum cameras (colour and surface defect detection); near-infrared (NIR) sensors (detect surface and sub-surface composition differences — water, fat, protein, sugar content; also detect certain contaminants with different NIR absorption to the food product); laser sensors; and X-ray (X-ray systems detect dense contaminants including bone fragments, glass, stones, and some metals — see X-ray inspection systems). Optical sorting applications in food processing include: grain and rice colour sorting (defective grain removal — see colour sorters page); nut and seed defect removal; dried fruit sorting (mould, sugar crystallisation, off-colour); fresh produce inspection (surface defect detection in packing lines); potato and vegetable piece sorting for ready meal or frozen food lines; and fish bone detection.
Frequently asked questions
What is the difference between a colour sorter and a full optical sorting machine?
A colour sorter (see colour sorters page) primarily uses visible-spectrum cameras to detect colour differences — it sorts based on colour variation from the accepted norm. A full optical sorting machine (sometimes called a multispectral optical sorter) incorporates multiple sensing technologies in addition to colour cameras: NIR sensors detect differences in surface composition that are not visible to the eye; laser sensors detect surface texture and some glass contaminants; and some systems incorporate X-ray detection. The additional sensing modalities allow the sorter to detect defects and contaminants that colour cameras cannot see — including internal mould in nuts, glass fragments, certain surface coatings, and foreign materials with colour similar to the food product. The choice between a colour sorter and a more sophisticated optical sorter depends on the types of defects to be detected and the budget.
Can optical sorting replace metal detection in a food safety programme?
Optical sorting machines are not a substitute for metal detection in a food safety HACCP programme. Metal detectors (electromagnetic induction-based) reliably detect metal fragments including non-magnetic stainless steel at sensitivities required by food safety standards — this is their primary role. Optical sorters detect surface and compositional variations but generally do not reliably detect small metal fragments (which may have a surface colour and appearance similar to the food product). For food lines requiring both physical contaminant detection and quality sorting, both metal detection and optical sorting are installed — they perform complementary roles. In some applications, X-ray inspection systems can detect both certain physical contaminants (bone, glass, stone, metal) and some quality defects (hollow or split nuts, air pockets in packaged product) — these may be considered alongside metal detectors in a risk-based physical contamination control plan.
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