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21.10.2019 Heat-resistant magnetic separator

Bunting Magnetics Europe, Berkhamsted, UK, chose the occasion of K2019 to launch its new FF350 drawer filter magnet which has been designed for use in high-temperature applications, as frequently encountered in the plastics industry. FF drawer filter magnets are used extensively in the plastics sector prior to moulding and extrusion, and also in the processing of secondary plastic. They collect and separate ferrous metal contamination from gravity-fed, dry, free flowing materials.

Mounted inside the outer housing are extremely strong neodymium rare earth magnets which attract and hold any magnetically susceptible contamination.  However, neodymium rare earth magnets can be permanently damaged if exposed to excessive heat, significantly reducing magnetic strength and the capability to separate fine ferrous magnetic particles. Accordingly, Bunting’s engineering team reviewed all aspects of the drawer filter magnet, assessing the areas of risk when exposed to high temperatures.  Magnetic integrity was vital and to maintain the magnetic strength and separation capability, the FF350 features special high temperature-compensated rare earth magnets.

Several modifications were introduced. Polycarbonate, which is suitable for working temperatures of up to 130°C, replaced the standard Lexan used for the viewing window.  The easy-release, high-torque door knobs are suitable for temperatures up to 175°C.  The housing is built to support symmetrical 4500kg compression loads and stainless steel centre drawer guides make removal and re-installation of the magnet drawer for cleaning quick and easy. The FF350 drawer gasket is made from Viton sponge material, which is rated to 200°C maximum temperature and resists heat ageing and compression set.  Polysulfone material is used on the front of the FF350, resisting intermittent temperatures up to 175°C.

A key feature of the new design is the ability for customers to easily upgrade existing units.  The design of the FF350 housing is the same as a standard model, and existing users can purchase drawers and other accessories separately to convert their FF drawer magnets to FF350 specification.


Bunting’s heat-resistant FF350 drawer filter magnet

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