Layered particle electrostatic deposition process for making a coated abrasive article
Assignee3M Innovative Properties Company
InventorsLouis S. Moren, Brian G. Koethe, Ernest L. Thurber
Life of this patent
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Abstract
Disclosed is a method of applying particles to a coated backing. A first layer of particles is created over a second layer of particles on a support surface and the first layer of particles is different in at least one property from the second layer of particles. A coated backing is positioned above the first and second layer of particles. An electrostatic field is applied simultaneously to the first and second layer of particles such that the first layer of particles closer to the coated backing are preferentially attracted to the coated backing first before the second layer of particles.
Claims17
A method of applying particles to a coated backing comprising:
- creating a first layer of particles over a second layer of particles on a support surface, wherein in the first layer of particles the first particles are different in at least one property from the second particles in the second layer of particles;
- positioning the coated backing spaced apart and above the first and second layer of particles;
- and
- applying an electrostatic field simultaneously to the first and second layer of particles wherein, due to electrostatic attraction at least some of the first and the second particles are picked up off the support surface, and the first layer of particles closer to the coated backing are preferentially attracted to the coated backing first before the second layer of particles.
A method comprising:
- moving a coated backing though an electrostatic field above a conveyor belt;
- and
- moving a first layer of particles positioned on a second layer of particles sitting on the conveyor belt through the electrostatic field;
- and
- wherein in the first layer of particles the first particles are different in at least one property from the second particles in the second layer of particles wherein the conveyor belt moves the first particle layer and the second particle layer through the electrostatic field transferring at least some of the first and second particles to the coated backing from the conveyor belt.
Dependencies are inferred from the claim text.