The detection of metal contamination in bulk powders and granules
Inspection of free-flowing bulk solids using high- performance metal detectors is an excellent method of eliminating metallic contaminants. A system may be installed where the product is falling freely by gravity, in existing pipework, or beneath a feed hopper. Machinery protection and improvement to product quality are metal detectors' prime benefits, but they also offer a valuable supplement to consumer protection on finished-pack inspection. The article discusses the design and operating principles of vertical fall metal detectors.
Metallic contamination has a number of sources, depending on the industry. The efficient removal of contaminants before damage is done is essential. Incoming raw materials, broken sieve wires and cutting knives, loose or broken machinery, operator carelessness, and general wear and tear con- tribute to the problem.