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Filter efficiency and life may be greatly increased by providing a low energy, ultrasonic vibration at or near the filter surface, preventing rapid agglomeration of the primary particles near the filter.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
84% of the total text.
Page 1 of 1
Ultrasonically Assisted Filtration of Magnetic Media Inks
Filter efficiency and life may be greatly increased by providing a low energy,
ultrasonic vibration at or near the filter surface, preventing rapid agglomeration of
the primary particles near the filter.
Magnetic attractions between magnetic particles as used in coatings for
magnetic recordings produce flocs of the primary particles. These flocculated
particles are undesirable in the finished coating since they hinder the orientation
of the particles in the finished coating. The formation of the flocs depends on (1)
the viscosity of the ink, (2) the density of the particles in the medium, and (3) the
stability of the dispersion. Filtration is greatly impaired. Further, filtration can be
rendered useless if not carried out immediately prior to the application of the ink
to the substrate.
Low energy, ultrasonic vibration is capable of reproducibly and
reversibly breaking the flocs back down to the primary particle size.
Ultrasonic dispersion at or near the filter surface prevents. the
rapid flocculation of the primary particles near the filter
interface. The ultrasonic vibration also maintains the quality of
the dispersion through the transport process to the coating head.
Primary flocculation is reproducibly dispersed by the ultrasonic
vibration placed in the flowing system. The placement of the
ultrasonic vibration device is critical since reflocculation can
occur as soon as the ultrasonic shear is removed...