Transfer assisted screen printing method of making shaped abrasive particles and the resulting shaped abrasive particles
Assignee3M Innovative Properties Company
InventorsDennis G. Welygan, Dwight D. Erickson, John T. Boden
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Abstract
Shaped ceramic articles can be obtained by screen printing the desired shapes from a dispersion of a precursor of the ceramic onto a receiving surface using a transfer assisted technique that applies a differential pressure, at least partially drying the screen printed shapes, and firing them to generate the shaped ceramic articles. Shaped abrasive particles made using lower viscosity sol gels that tended to flow or creep after the screen printing formation were found to have higher grinding performance over screen printed shaped abrasive particles made with higher viscosity sol gels.
Claims24
A process for the production of shaped ceramic articles by a screen printing process which comprises applying a dispersion of a ceramic precursor to a receiving surface through a printing screen comprising a plurality of apertures, removing the printing screen from the receiving surface to form a plurality of screen printed shapes while applying a differential pressure between a first side of the screen printed shape and a second side of the screen printed shape that is in contact with the receiving surface, at least partially drying the screen printed shapes remaining on the receiving surface and firing the screen printed shapes to form sintered shaped ceramic articles.
A process for the production of shaped abrasive particles comprising alpha alumina, the process comprising screen printing shapes of a boehmite alumina sol gel onto a receiving surface to form a plurality of screen printed shapes, removing the screen printed shapes from a printing screen while applying a differential pressure between a first side of the screen printed shapes and a second side of the screen printed shapes that are in contact with the receiving surface, at least partially drying the screen printed shapes and firing the screen printed shapes at a temperature sufficient to convert the alumina to the alpha phase.
A process for the production of shaped abrasive particles comprising alpha alumina, the process comprising screen printing shapes of a boehmite alumina sol gel onto an air permeable receiving surface, the air permeable receiving surface located adjacent to a vacuum box or vacuum roll while filling apertures in a printing screen with the sol gel to form a plurality of screen printed shapes, removing the screen printed shapes from the printing screen, at least partially drying the screen printed shapes, and firing the screen printed shapes at a temperature sufficient to convert the alumina to the alpha phase.
Dependencies are inferred from the claim text.