Why do we need the single-sided magnet in some field?

　　Artificial magnet of magnetic products factoryis divided into hoofed magnet and bar magnet, and it can be seen everywhere in our daily life. The hoofed magnet is more popular. Single-sided magnet refers to a magnet, whose one side has magnet and the other side’s magnet is weak. The method is to use special processing galvanized iron sheet will double magnet a bun, which wrapped a magnetic will be shielded, magnetic is reflected to the other side, and the other side will be enhanced magnetic.

　　On some occasion, only need that one side has a magnet, because if another side has magnet, it will cause damage or disturbance. In some fields, such as the magnet on packing box, it only needs that one side has magnet, and the other side can not be magnetic, because it has no use. Using single-sided magnetic will greatly reduce the cost and save the magnetic material.

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