Ceramic roller for esa printing and coating

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 13/18 (2006.01)

Patent

CA 2189339

An electrostatic assist roller (30) for use in a coating printing or copying machine includes a cylindrical roller core (35) and a ceramic layer (38) formed by plasma spraying a blend of an insulating ceramic material and a semiconductive ceramic material in a ratio which is selected to control the resistance and thickness of the ceramic layer in response to an applied voltage differential. The semiconductive ceramic layer (38) is sealed with a solid low viscosity sealer (39) such as Camanba wax, to protect the ceramic layer (38) from moisture penetration. A second ceramic layer (37) may be used to insulate the semiconductive ceramic layer (38) from the core (35).

Un rouleau (30) à assistance électrostatique, utilisé dans une machine de reproduction, d'impression ou de revêtement, comprend une âme de rouleau cylindrique (35) ainsi qu'une couche céramique (38) formée par la pulvérisation au plasma d'un mélange d'un matériau céramique isolant et d'un matériau céramique semi-conducteur selon un rapport choisi pour permettre la régulation de la résistance et de l'épaisseur de la couche céramique en réponse à un différentiel de tension appliquée. La couche céramique semi-conductrice (38) est hermétiquement recouverte par un matériau d'étanchéité solide de faible viscosité (39), tel que la cire de Carnauba, afin de protéger ladite couche (38) de l'humidité. Une seconde couche céramique (37) peut être utilisée pour isoler la couche céramique semi-conductrice (38) de l'âme (35).

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