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US 7,001,645 B1Granted
Magnetic coating, coating method with same and coating apparatus therefor
AssigneeMagnesia Industries Inc.
InventorClaude Texier
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AssigneeMagnesia Industries Inc.
InventorClaude Texier
Estimating the term…
The invention seeks to provide a magnetized coating suitable for exerting durable magnetic forces. To do this, the method of the invention consists in spreading conductive particles (13) on a medium (11), the particles being directed by prior magnetization along an inducing magnetic field and being embedded in a binder (12). The coating apparatus for implementing the method of the invention comprises means (10, 15) for feeding the medium (11) onto a conveyor (20), means for applying a main binder (12) via presser rollers (40) and via at least one nozzle (30), said means being coupled to heater means, a tank (50) of particles (13) coupled to a duster (51) for dispensing the fill of particles, means for spreading the fill of particles within the main binder, electromagnetic means (60) for producing an anisotropic magnetic field for magnetizing the particles, a sprayer (80) for depositing an additional binder, dryer means (100), demagnetizer means (110), and winder means (120). The invention is applicable to media particularly in paper-making, games, decoration, or building.
A method of applying a coating on a backing medium, the method comprising a step of applying a main binder on the medium while the medium is being guided by a conveyor, a step of controlled dispensing and uniform spreading of a fill of conductive particles in the binder, coupled with a step of directing the particles by magnetization, followed by a step of demagnetization, a step of covering the particles in a deposit of an additional binder, and a step of drying the assembly.
Coating apparatus, the apparatus comprising means for feeding a medium onto a conveyor, means for applying a main binder via presser rollers and via at least one nozzle, said main binder applying means being coupled to heater means, a tank of particles coupled to a duster for dispensing the fill of particles, means for spreading the fill of particles within the main binder, electromagnetic means for producing an anisotropic magnetic field for magnetizing the particles, a spray for depositing an additional binder, a dryer means, and a demagnetizer placed immediately downstream from the electromagnetic magnetizing means and a final magnetizer is placed downstream from the dryer means, when the fill comprises at least some ferromagnetic particles.
Dependencies are inferred from the claim text.