Abb Research Ltd.

Abb Patent Gmbh

Jorg Sopka

Gunter Borner

Josef Wittmann

Johann Christoph Nienburg

Hans-Christoph Nienburg

Josef Flatz

Helmut Bohme

Wolfgang Kleber

Hans Christoph Nienburg

Hermann W Grunling

Workpieces are electrostatically coated with powder materials. It is possible to attain a relatively large coating thickness in a single operation by simultaneously or alternately coating with powder particles that have a different electrical charge. The process can be used in applying single-component or multi-component coating materials.

Electrostatic coating process

A method and an apparatus for powder spraying can be used, for example, for electrostatic enameling. In order to achieve an easily regulatable high powder output rate, it is proposed to fluidize powder in a closed container, extract it in the region of the fluid bed and cause it to emerge through a nozzle on the container. The container is subdivided by a frit into a first chamber to which air is fed and a second chamber which contains the powder and out of which air is discharged through a valve. A powder output rate can be regulated by the regulation of air pressures.

Method and apparatus for powder spraying

A method and a device for controlling the outflow of fluid powder from a container can be used for controlling the expulsion of powder out of a powder-spraying apparatus for electrostatic coating. The disadvantages of a mechanical closing device are avoided by introducing closing air into an extraction pipe for extracting fluidized powder out of a container. The closing air is introduced through a pipe which opens into an orifice in the casing of the extraction pipe. The mass flow of fluidized powder can be controlled by an appropriate setting of a pressure in the extraction pipe in relation to the pressure in the fluid bed, that is to say by the introduction of closing air at an appropriate pressure.

Method and device for controlling the outflow of a fluidized solid from

A piston valve for liquids provides potential isolation between an inlet-side and an outlet-side liquid. The piston valve is suitable, in particular, for controlling water-based paints in painting appliances which operate by electrostatic charging. At least one control electrode which is at the electric potential of the liquid present at the outlet of the valve is provided in order to improve the service life of the valve.

Piston valve

A process is provided for producing an anode for an electrochemical cell, in particular a solar cell, on electrically conductive glass to which a layer of porous metal oxide is applied. The layer includes metal complexes of the porphyrin-phthalocyanine class and other dyestuffs and is then subjected to a heat treatment. A paste of highly dispersed metal oxide, in particular aluminum oxide and/or titanium oxide, is first produced with the addition of a dyestuff and an alcoholic solution, which acts as a binder, in a dry atmosphere. The paste produced in this way is applied as a thin layer to the glass plate coated with a transparent, electrically conductive layer, and the configuration including the glass plate and the pasty metal oxide layer is subjected to a heat treatment at temperatures below 300.degree. C.

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Schwetzingen, Germany

Jorg Sopka