Foreign body detection

Foreign bodies have become the first source of consumer complaints in the food-processing industry, highlighting the critical importance of effective detection and prevention systems. Various detection techniques exist to realize the detection, spatial location, and sorting for the ejection of foreign bodies possibly present in products, with each technology offering specific advantages for different types of contaminants and materials.

Metallic contaminants include ferrous metals (iron, steel), non-ferrous metals (aluminum, copper, brass), and stainless steel fragments that can originate from equipment wear, machining debris, or raw material contamination. Metal detectors are specifically designed to detect these metallic contaminants but have limitations with non-metallic foreign bodies.

Glass and hard plastic particles are common foreign bodies that can cause serious injuries if consumed, with glass fragments as small as 0.5 mm detectable using proper imaging techniques. These contaminants typically originate from broken equipment, light fixtures, bottles, or packaging materials.

Bone fragments and stones represent significant hazards in food products, particularly in meat, fish, and produce, where they can cause choking, dental damage, or internal injuries. X-ray inspection systems are particularly effective at detecting these dense materials based on their density differences from the surrounding product.

Organic foreign materials include wood, rubber, production webbing, sod, and insects that can contaminate products during production, harvesting, or processing. These materials are particularly challenging to detect because they often have similar density to the product itself, requiring advanced detection technologies like hyperspectral imaging.