A module for chains or belts is molded from a plastic compound containing a magnetizable element. The molding may be performed in a standard injection molding machine equipped with a device (129) that produces an electromagnetic or permanent magnetic field (131). The field lines are directed in such a way as to penetrate the mold cavities (116) and the molded part in the desired axis, in order to electrically charge the magnetizable particles and orient them to form a permanently magnetized plastic body. After discharge of the mold (111), the plastic part has magnetic properties with opposite charges at opposite poles.
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