Degaussing packaging of magnets

The so-called degaussing, in fact, the magnetic did not disappear, just through the magnetic material to change the magnetic field distribution of the magnet.

The degaussing package is usually isolated by iron sheet. The six sides inside the box are fixed, and then the pearl cotton bag is used, and then the box is packed. For some magnets with weak magnetism, they can pass the security check of the airline.Some magnetic insulation materials sold on the market can also play a better demagnetization effect, the strong magnet reassembly, so that the magnetic reduction of the strong magnet, in order to make the strong magnet through the airline security, take the plane.

The principle of magnetic isolation is to shield the magnetic field, which mostly refers to the stable and constant magnetic field or low-frequency magnetic field, mainly relying on magnetic field circuit. If the box is made of high-permeability material, the "magnetic field line" that would have gone through the box will be concentrated in the box body material to form a closure, thus the magnetic field line outside the box will be greatly reduced.In order to realize magnetic field shielding, the higher the magnetic permeability of the material is, the better;The same material, the thicker the better;For the same material and thickness, the more layers the better.In addition, the magnet should be placed in the center of the shielding box to prevent more concentrated magnetic field lines on one side from leaking out.

If you want to shield the high-frequency magnetic field, it is to use a method: with a good conductive material such as metal, the high-frequency magnetic field on it to form an alternating eddy current, the opposite magnetic field to eliminate the magnetic field, the essence is the superposition of two magnetic fields, in the shielding external elimination, in the shielding internal synthesis of a new magnetic line.

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