Magnets for ferrous-magnetic contaminations in plastics

Bars and grilles


magnetic filters


rollers and drums




magnetic systems


Neodymium, the permanent magnet

Neodymium Nd is a rare metal and was discovered in 1885. It has multiple application uses and is identified with NdFeB (N35, N45, N52) .

It generates a magnetic field with strong attraction to magnetic metals and ferrous, such as splinters, screws or bolts, even in dusty form such as filings. 

separation of ferrous-magnetic contaminations

In the processing of plastics, whether in recycling or in the production of granules, it often happens that the product is contaminated with ferrous and/or magnetic metal shavings.

The presence of these metal contaminations reduces the quality of the product and causes additional problems, such as clogging of filters or injector nozzles, breakage of extrusion screws, etc.

The use of magnetic separators ensures that the plastic is thoroughly cleaned of all ferrous impurities.

magnets against ferrous-magnetic contaminations

different applications, specific solutions

Magnetic bars and grids

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Magnetic tube filters

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Magnetic plates and drums

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Self-cleaning magnetic systems

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Easy clean systems

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Magnetic tube filters are an evolution of magnetic grids. These accessories are generally cylindrical or square in shape and, as they have an inlet and outlet hole, can be installed directly on the pipes through which the plastic passes.

The installation is purely vertical, so that the plastic product passes through the system by gravity. Inside the magnetic tube filters there can be one or more grids, mounted in succession, in parallel and with the bars staggered. This increases the size and intensity of the magnetic field, and therefore the effectiveness of retaining ferro-magnetic impurities.

In addition to grids, magnetic filters can also consist of a single central magnet, or two side magnetic plates. These solutions are suggested in cases where the plastic product is dusty or otherwise not very flowing and the use of magnetic bars would hinder the constant flow of the plastic.

The application points can be different: loading and unloading of silos, product outlet from granulators or on the feed lines of extruders or moulds. In some cases the use of a gravity metal separator with a magnetic tube filter is suggested. The combination of the two systems offers different benefits, especially in the presence of a heavily polluted plastic product.

It is recommended to first install the magnetic filter and then the gravity metal separator. The product is first cleaned of all magnetic metal contaminations, including ferrous dust and filings, when it passes through the magnetic filter. Then the metal separator controls and rejects all other non-magnetic metals that have not been retained by the magnetic filter. In this way two separate controls are obtained and the gravity metal separator will reject less polluted plastic product.

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