Ultrasonically Enhanced Magnetic Ink Filtration
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
Current procedures for producing magnetic ink for use in coating data storage disks utilize a filtration operation in the final stage of ink preparation. The objective of this filtration is the removal of unwanted process debris, undispersed magnetic particles, and other foreign material from the ink. This removal improves the performance level of the resultant disk by minimizing the number of defects caused by nonhomogeneities in the magnetic coating. The flow of magnetic ink through a filter is enhanced by the application of ultrasonic energy. This flow enhancement permits the use of a finer filter and/or increased filter efficiency with a resultant improvement in magnetic disk performance.