Tunnel Demagnetizer

A demagnetizer is a machine that removes magnetism from a piece of magnetic object when the presence of magnetism is undesirable. Demagnetizers are versatile since they can remove magnetism from large magnetic work pieces as well as smaller magnetic parts. There are various types of demagnetizers available. Hand demagnetizers and tunnel demagnetizers are those used to demagnetize smaller work pieces. These machines are compact, light-weighted and portable. The tunnel demagnetizers are especially ideal for handling the parts that are too small for hand magnetizers. On the other hand, the demagnetizers for larger work pieces are usually not portable. Besides tunnel and hand demagnetizers, other devices that are also commonly applied industrially include plate demagnetizers and cassette demagnetizers.

Tunnel Demagnetizers

The tunnel demagnetizers are the machine designed for standard demagnetization applications for small and medium size parts. The tunnel demagnetizers have a fast working cycle characteristic which brings about its high productivity. The use of a tunnel demagnetizer is ideal for situations to which the use of other types of demagnetizer is inapplicable. For example, a tunnel demagnetizer is used when the magnetic pieces are too small for a hand demagnetizer to deal with. The tunnel demagnetizers are light-weighted, compact and easy to operate; therefore, they are practical for a wide range of applications.

Configuration of Tunnel Demagnetizer

A tunnel demagnetizer usually comes in with the size of an oven; it may have a larger or smaller size so to speak. There are buttons and switches on the device to turn on/ off the machine and to adjust the settings. There is a blank that goes through the demagnetizer from the front side to the back side of it which looks like a tunnel, and hence the name. The tunnel is for the magnetic parts to pass through and once they do, the magnetism is removed from them.

Some tunnel demagnetizers have the configuration that almost looks like a gateway or an arch with the tunnel wider than usual. This type of tunnel demagnetizer is designed for a conveyor line to go through. Working with a conveyor line, the productivity of the tunnel demagnetizer is further improved; magnetic parts can be continuously sent through the tunnel magnetizer to be demagnetized. There are models that have two tunnels in one machine; one tunnel for demagnetizing and the other for magnetizing metal pieces.


Magnetic materials in general are the objects that possess magnetism. These objects are typically metals. Magnetism allows these objects to attract and or repel other magnetic pieces. Though magnetic objects are all metals, not every type of metals is magnetic. The metals that possess magnetism are usually the iron- or nickel-based alloys. These magnetic metals that produce a magnetic field due to their internal structure are called permanent magnets and it is not easy to remove the magnetic force from these metals. Magnetism is useful in certain applications such as clamping and lifting. However, it is unwanted and needed to be removed for particular applications as well. Therefore, a demagnetizer is an effective device to remove magnetism from the pieces.

Magnets & Magnetic Materials

Magnetism is a force that exists in magnetic materials. The force allows these objects to attract or repel each other. Some magnetic materials have stronger magnetic force inherently while some have weaker magnetic force. Regardless of how powerful the magnetic force a given material has, the magnetism can be removed by a demagnetizer. The three types of magnets are the permanent magnets, temporary magnets, and electromagnets.

Permanent Magnets

Permanent magnets have magnetism inherently because of their internal structure. They are made of ferromagnetic materials which grant them strong magnetic force which cannot be easily removed. The magnetic field is constantly and permanently produced by the ferromagnetic materials inside these objects. It takes more time for a demagnetizer to remove the magnetism from a permanent magnet.

Temporary Magnets

The internal structure of temporary magnets does not allow them to produce the permanent magnetic fields and they only display their magnetic properties under certain circumstances. Once these circumstances are lifted, their magnetic force is lost. For instance, temporary magnets only become magnetic when exposed to a strong magnetic field.


Electromagnets display their magnetic properties when an electric current passes through them. They can be seen in devices such as motors, generators or headphones. The application of electromagnets involves a ferromagnetic core and a coil of wire that winds around the core. Similar to temporary magnets, the electromagnets only generate magnetic force under certain situations. In this case, if the electric current is no longer presented, the magnetic force is lost.

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