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US 4,288,469 AGranted
Anodized aluminium rollers with improved electrical conductivity and a process for their manufacture
AssigneeAgfa-Gevaert
InventorsRudolf Meyer, Gunther Koepke, Roland Hourticolon
Life of this patent
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Abstract
The electrical conductivity of the surface of eloxated aluminium rollers in the pores of the eloxation layer a metal is deposited which has little or no tendency to corrosion.
Claims4
A process for producing a transporting roller comprised of aluminum with a surface adapted for transporting photographic materials
- and having a highly insulating porous anodic oxide formed on the member surface,
- with conductive surfaces on the anodized oxide layer including the steps of immersing the member in an aqueous cleaning liquid
- subjecting the anodic oxide layer of the immersed member to ultrasonic treatment
- impregnating the pores of the treated oxide layer with an aqueous solution of a wetting agent and the salt of a conductive and corrosion-resistant metal,
- treating the impregnated metal salt with a solution of a reducing agent to reduce the metal salt in the oxide,
- and forming a conductive layer on the outer surface of the oxide layer and conductive surfaces in the pores
- so that the surface layer is in conductive connection with the aluminum roller.
4 more elements
A process for producing electrical conductivity between
- a transporting roller comprised of aluminum with a surface adapted for transporting photographic materials and having a highly insulating porous anodic oxide formed on the member surface,
- and conductive surfaces on the anodized oxide layer
- said process including the steps of immersing the member in an aqueous cleaning liquid
- subjecting the anodic oxide layer of the immersed member to altrasonic treatment
- impregnating the pores of the treated oxide layer with an aqueous solution of a wetting agent and the salt of a conductive and corrosion-resistant metal,
- treating the impregnated metal salt with a solution of a reducing agent to reduce the metal salt in the oxide,
- and forming a conductive layer on the outer surface of the oxide layer and conductive surfaces in the pores
- so that the surface layer is in conductive connection with the aluminum roller with a conductivity in the range of from 1-100 ohms.
5 more elements
Dependencies are inferred from the claim text.