Making Magnetic Molded Parts Faster, Cheaper

Two inventions point to new ways to create magnetic properties in molded plastic parts.

Sabic applied for a for a method of manufacturing a functionally graded part in which magnetic fields are applied within a mold to separated portions of a plastic compound containing a magnetic filler.

The magnetic filler comprises magnetic particles, magnetic fibers, iron, nickel, cobalt, ferrites, or/and rare earth magnets.

The inventors say that the invention overcomes cost and efficiency problems with currently used ways to make functionally graded magnetic parts.

In a separate patent application, two North Carolina inventors eliminated the in-mold magnets in an effort to create a less costly and faster approach to magnetic molding.

An electric current is applied to the mold while forming apart from polyamide and a metal to align the poles of the suspended metal in a single direction before the mixture has hardened. A magnetic field is then applied to the hardened mixture to provide the product with magnetic properties. The loading of ferrite particles is 30 to 33 percent.

In the magnetic plastic induction system, a DC transformer (206) applies a current to an injection mold (209), aligning the poles of barium ferrites particles loaded in polyamide. (USPTO)

About Doug Smock

Former Chief Editor at Plastics World and Senior Technical Editor Design News
Magnetic Material, North America

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