Rotary, Grate, Demountable Magnets Magnets for Powder

GEA produces a range of magnets to remove ferrous particles from free-flowing product without restricting product flow during powder transfer.

In any process that includes moving components, there is a risk of contact which can result in contamination to the product. Not only does this present a risk of damage to process equipment, there is a more important risk of contaminated products finding their way into the supply chain and to consumers.

Sources of Metal Contamination

GEA Nu-Con Rotary Magnet Open
  • Incoming ingredients (contaminated during processing or transportation of the ingredient)
  • Processing equipment (grinding, crushing processes or general abrasion or vibration causing the loss of nuts and bolts etc)
  • Inadequate personnel practices and environmental causes

Rotary Magnet

GEA Nu-Con Rotary Magnet
Rotary Magnet

The rotary magnet is a sanitary and economic method of removing ferrous particles from product. In addition, the rotating action tends to break up lumps and cohesive materials.

Benefits include:

  • the rotary action enables uninterrupted running without the bridging or clogging that is usually experienced with grate magnets 
  • hand demountable design, easily cleaned 
  • low profile and height saving

Factors Affecting Magnet Performance

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There are several factors that can affect the effectiveness of a magnet's performance: 

  • Temperature: Magnetic materials lose strength when exposed to elevated temperatures. When magnets are heated beyond certain temperatures (which depend on their specific material), they lose strength that cannot be recovered by cooling.     When using magnets in a process that involves high temperatures, make sure you are using the correct material. 
  • Flow Characteristics: Many food products exhibit different flow characteristics when damp or moist. For instance, sugar with high moisture content can form large particles that may plug the opening of a magnetic separator. This can stop the product from flowing the tubes of the magnet.
  • Equipment Design: The spacing and number of tubes in magnetic equipment affect the strength of the magnetic field it generates. Closer spacing and more tubes mean a stronger magnetic field and higher efficiency.
  • Product characteristics: The characteristics of the food being processed greatly affect the effectiveness of magnetic separators. Food products can be categorized in three groups: dry, liquid or moist.
  • Dry Products: Range from small food grains flowing down a chute to large rock-like products moving along high-speed conveyor belts. Each one requires different separation equipment. If the material is small and free-flowing, a grate magnet may be best. Plate magnets do not disturb the flow of the product nor cause it to build up when it cascades down a sloped chute. Suspended magnets work efficiently when dry products are transported on a conveyor belt.        
  • Moist Products: Such as flour or starch do not flow through grate magnets because of product build up. The best option is to use a powerful magnet that is completely out of the product flow. A magnetic rotation system outside the product line eliminates product build up and allows product to flow freely.
 

Grate Magnet

GEA Nu-Con Grate Magnet Hands

Grate magnets remove small particles of ferrous metal from free-flowing powders and granular materials. They are used extensively in the cosmetics, chemicals, plastics and food industries with non-cohesive product and are usually installed prior to milling or packing.

Benefits include:

  • available in conventional and extra-powerful rare earth options 
  • easy disassembly for cleaning by hand. 
  • low profile and height saving.

Demountable Magnet

A demountable magnet offers a sanitary and economic method of removing ferrous particles from product. In addition, the rotating action tends to break up lumps and cohesive materials.

Benefits include:

  • the rotary action enables uninterrupted running without the bridging or clogging that is usually experienced with grate magnets 
  • hand demountable design, easily cleaned 
  • low profile and height saving

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