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.
Claims9
A system comprising:
- a conveyor belt moving though an electrostatic field;
- a coater applying a make coat onto a backing;
- a web path guiding a coated backing through the electrostatic field above the conveyor belt and the make coat on the backing is positioned facing the conveyor belt;
- a first particle feeder applying a first particle layer onto the conveyor belt over a second particle layer on the conveyor belt;
- a second particle feeder applying the second particle layer onto the conveyor belt located before the first particle feeder with regard to the conveyer belt's direction of travel;
- and
- wherein the conveyor belt moves the first particle layer and the second particle layer though the electrostatic field transferring at least some of the first particles and at least some of the second particles to the coated backing from the conveyor belt.
Dependencies are inferred from the claim text.