Coating processes – Falling curtain of coating material utilized
Patent
1996-08-13
1998-06-30
Bareford, Katherine A.
Coating processes
Falling curtain of coating material utilized
118324, 118DIG4, B05D 130
Patent
active
057730946
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention is a national stage application of PCT/EP95/00351, filed Feb. 1, 1995.
TECHNICAL FIELD OF THE INVENTION
The invention relates to a method for painting visible exterior body parts of motor vehicles in series prior to assembly on the vehicle, wherein a surface of an object to be painted is curved in one dimensional direction.
PRIOR ART
Most of the body parts of passenger cars which remain visible after assembly are painted for the purposes of corrosion protection and for visual reasons prior to being first assembled. An example of such a visible exterior body part is the cover attached to the B pillar, which can be found in several vehicle types and is made of metal and requires the highest possible quality of paint. As a rule the cover is at least slightly curved in the dimensional direction extending in the longitudinal direction in accordance with the future shape of the body.
Up to now, so-called paint spraying has proven itself as a dependable painting system for such objects. Satisfactory painting results have been obtained in spite of the existing curvature of the surface of the object to be painted. However, the costs connected so far with such a painting method are still relatively high. A large part of the sprayed paint does not hit the surface of the object to be painted and is lost through the exhaust air. A recovery for reuse at reasonable costs has not been possible up to now. In addition, expensive protective and filter installations are required to prevent air, which is enriched with solvents to an impermissible degree, from reaching the atmosphere.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore the object of the instant invention to propose a method of the type mentioned at the outset which allows the more cost-effective painting of the objects without loss in quality.
To attain this object it is provided that the objects to be painted are attached to holding means of a conveying system and subsequently moved, still continuously remaining on the respectively assigned holding means, through a falling paint curtain consisting of liquid paint transverse to the plane of falling paint curtain, that the curved surface of the object faces up and the dimensional direction of the curve, viewed from above, coincides with the conveying direction, wherein the orientation of the objects to be painted while they pass through the paint curtain is suitably affected by controlled positioning of the holding means.
Thus, use is made of steps, known per se, of the so-called paint curtain method which up to now had been preponderantly used in the furniture industry. However, it is provided to fix the object to be painted in place on holding devices of a conveying system and to move them through the paint curtain while they continue to be kept on the holding means. In this way the objects to be painted are optimally held during the entire paint application and can even be oriented, if required, by suitable position changes of the holding means in such a way that the coat of paint is optimal in respect to the paint distribution and coating thickness. It has been shown that it is possible in this way to create high-quality paint coatings which give a glass-like impression and satisfy the highest requirements visually as well as in respect to corrosion protection. Since paint spraying does not take place, it is possible to collect the surplus paint from the paint curtain without problems and to reuse it without a large outlay. Since in addition there is hardly any contamination of the air, the outlay for protective or filtering steps is small, so that the method as a whole has been shown to be extremely cost- effective.
Paint curtain devices are known per se. A type known to Applicant has a pouring head for creating a paint curtain consisting of downward flowing liquid paint, a collecting device for unused paint from the paint curtain disposed at a distance below the pouring head and a conveying system disposed outside the area covered by the falling paint cu
REFERENCES:
patent: 3984902 (1976-10-01), Prazak, III
patent: 4473027 (1984-09-01), Arfert et al.
patent: 4600601 (1986-07-01), Tamura
patent: 4838199 (1989-06-01), Weber
patent: 5096750 (1992-03-01), Edlert et al.
Curtain Coating Picture Frames, pamphlet, by Darrell Ward, Mar. 1959.
Bareford Katherine A.
KSK Industrielackierungen GmbH
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