E.i. Dupont De Nemours and Company

Peter Minko

Holger Schmidt

Marc Chilla

Ludwig Siever

Christian Voye

A process for the production of special effect base coat/clear coat two-layer coatings on substrates by application of a special effect base coat layer of a liquid special effect base coat onto the substrate in one or more successive spray passes, optional drying or curing of the special effect base coat layer, followed by application of a clear coat layer and curing of the clear coat layer, wherein, at least in the final spray pass, application of the special effect base coat proceeds by electrostatically-assisted high-speed rotary application using at least one high-speed rotary coating device comprising a high-speed rotary bell, wherein an electrode ring is rotatably positioned around the high-speed rotary bell and used for external electrostatic charging of the effect base coat spray mist and performs rotational movements about the common axis of rotation with the high-speed rotary bell.

Electrostatically-assisted high-speed rotary application process for the production of special effect base coat/clear coat two-layer coatings

An electrode ring suitable for providing electrostatic assistance to the high-speed rotary application of spray coatings and having electrode fingers comprising electrode tips, wherein the electrode ring is constructed so as to be capable of performing rotational movements about the axis directed through the center of the circle thereof.

Rotatable electrode ring and use thereof in electrostatically assisted high-speed rotary application of spray coating agents

A process for the generation of a computer image of a coated, three-dimensional object involves applying at least a relevant coating layer on at least two test panels under the influence of a set of coating parameters which differs with respect to each panel; taking a plurality of measurements of at least one optical surface property as a function of the set of coating parameters selected on application of the relevant coating layer on each panel; storing the optical data in a datafile with assignment of the relevant set of coating parameters; facetting the visible surface(s) of a three-dimensional object by computer into a sufficient number of flat polygonal areas each being sufficiently small for the sufficiently accurate description of the surface topography; assigning the relevant set of coating parameters and associated optical data in each case to each individual polygonal area by computer; and assembling the polygonal areas into a computer image of the three-dimensional object.

Process for generating a computer image of a coated three-dimensional object

A process for producing a two-layer coat on a motor vehicle body in an automatic motor vehicle series lacquering unit. The process comprises the steps of applying an aqueous base lacquer coating composition to the motor vehicle body, exposing the aqueous base lacquer coating to a circulating air at 25 to 45&deg; C. having an air throughout of 0.10 to 0.70 m/s for 30 to 180 seconds, applying a transparent finishing lacquer layer of a clear lacquer coating composition to the aqueous base lacquer layer, and baking the aqueous base lacquer and transparent finishing lacquer layer.

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Schwelm, Germany

Peter Minko