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.