Magnetic solutions for the food industry, use of magnetic drums

Magnetic drums are suitable and effective solutions for the removal of magnetic particles that require a large amount of specialized knowledge in the field of magnetic engineering.

Definition and operation of magnetic drums

A magnetic drum is one of the multiple possibilities of separation of metallic particle contaminants from foodstuff products. The magnetic drum is a cylindrical body that rotates through a unit around its own axis. The outer diameter of the magnetic drum is equipped with strong permanent magnets around the circumference. The material that is filtered is fed to the magnetic drum through a free-fall ramp, which is usually designed as a vibratory ramp. The generated vibrations thus facilitate the actual separation of magnetic particles, which is carried out continuously by the magnetic drum.

Magnetic drums are used in a wide range of applications. Therefore, magnetic drums can be designed specifically for special applications where certain requirements must be met. Whether fine or irregular shape products, whether small or large product flows, the magnetic drums can successfully solve these problems with a specific design of the application. Whether the products to be cleaned contain few or many metallic contaminants, the magnetic drums can meet all these different requirements.

Use and application of magnetic filters in the food industry

Especially in the food industry, it is of great importance that metallic contaminants are removed from the finished products. To achieve this necessary objective of separating metal particles, the food industry mainly uses magnetic drums, magnetic filters and magnetic rollers.

Magnetic rollers are cylindrical units that have a permanent but non-homogeneous magnetic field. The magnetization of the magnetic roller is designed geometrically so that the north and south poles face each other in the axial direction of the roller. Half of the circumference of the cylinder has North Pole magnetization, the other half has South Pole. The magnetic field therefore weakens on the two parallel sides of the plane. This special feature qualifies the magnetic roller, for example, as a pulley for a conveyor belt, since there are no metal particles under the belt.

Magnetic filters are particularly suitable for the separation of metal contaminants in liquids. This filter method meets requirements of high hygiene standards. Therefore, they are also used in the food and pharmaceutical industries. The liquid to be cleaned passes through a product channel, in the center of which there is a thick magnetic bar or bars in the axial direction. The metallic particles adhere magnetically to the bars and from time to time, require cleaning. The flow of the product stops for a short time and the magnetic filter is cleaned of accumulated metallic particles.

The design of magnetic particle separation systems requires a high level of experience. We have acquired this experience over many years working in this specialist field. Test our reliability.


The best advice on magnetism

In many permanent magnet applications, it is important to achieve strong magnetic properties with small magnet dimensions. Therefore, permanent magnets made of neodymium with the strongest magnetic properties are often used. Such permanent magnets are generally produced by sintering. The magnetic material used is exposed in the powder state to an applied external magnetic field. After the alignment of the particles, the magnetic material is compressed at high pressure and at high temperature. The preferential direction resulting from the magnetization is also known as anisotropy. This sintering method gives the magnet a much higher energy density than isotropic magnets. For isotropic magnets, the magnetic values ​​are almost equal in all directions.



By using magnetic drums, magnetic filters and magnetic rollers, products contaminated with metallic particles can be cleaned again. Each cleaning and filtering method has its specific strengths and advantages. The decision to choose a specific particle separation system, depends on the type of product to be cleaned, the desired speed of the cleaning process and the size of the particulate contamination. In the selection of a suitable magnetic material, external conditions, such as room temperature, play an important role.

Suitable and effective solutions for the removal of metallic particles require a large amount of specialized knowledge in the field of magnetic engineering.

Our customers know their problems of separation of metallic particles are in good hands with us. They trust our extensive experience in the field of magnet technology. Contact us at any time.

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