Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized
Patent
1997-05-02
1999-12-07
Parker, Fred J.
Coating processes
Direct application of electrical, magnetic, wave, or...
Electrostatic charge, field, or force utilized
427476, 427485, 427486, 118624, 118629, 118634, B05D 106, B05D 706, B05B 5025, B05B 502
Patent
active
059979593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The instant invention teaches a method for painting parts made of dielectric or low-conductivity material, an electrode for painting parts made of dielectric or low-conductivity material and an apparatus for painting parts made of dielectric or low-conductivity material
The instant invention applies particularly to the carpentry and furniture industries.
BACKGROUND ART
The current methods for painting on wood involve sanding, staining, waiting for the stain to dry, peeling off the stain, applying a liquid finish, waiting for the liquid finish to dry and then repeating this process several times, often as many as seven times. The edges of the boards are treated separately and the two faces must be treated several times. The entire process, therefore, takes two and a half days (for a basic finish) or up to four days (for complex forms involving moldings, cuttings and grooves). Additionally, the liquid finishes are not guaranteed to hold more than one, or maybe a few years. The spectrum of colors is forcibly very limited. Finally, the coats of finish must be applied evenly; in other words, the number of coats on the two faces generally must be the same, or the board will appear shaded.
Other methods for finishing wood involve coating the faces of the board with a sheet of laminated paper or veneering. Complex forms are, therefore, difficult to finish, if not impossible, by such a means of manufacture. The coatings and their bondings with the wood are of limited value against impacts to the wood.
Finally, a last method involves applying, by way of pressure and heat, a film of plastic material of different color and structure on one face and the four edges. This method cannot be used to cover the entirety of a board in one application. Further, the natural grain of the face of the wood may allow the film to show through The choice of colors here, too, is very limited.
The instant invention seeks to resolve these problems by proposing a method of painting parts made of dielectric or low-conductivity material in particular wood, an electrode and an apparatus for painting on said materials using said method.
SUMMARY OF THE INVENTION
The method described in the instant invention is a method for painting parts made of dielectric or low-conductivity material in which a paint-spraying unit including a chamber connected to both a paint outlet and a paint supply is used. This method essentially involves mechanically and electrically connecting at least one electrode to the part to be painted, creating an electrostatic field between the electrode and the paint spraying unit by applying a difference of electrical potential between the electrode and another electrode lodged in the chamber of the paint spraying unit, feeding the paint from the paint supply through the chamber to the outlet, electrically charging the paint and spraying said paint onto the part to be painted.
A solid paint in powdered form is the preferred paint to be used. For example, a polyester-based, powdered paint could be used.
According to another embodiment, the method of painting involves inserting the electrode into the part to be painted. This embodiment allows for painting all external surfaces of the part to be painted.
In variation, the method of painting involves placing an electrode on at least one of the external faces of the part to be painted. Such a method limits painting to those faces not covered by the electrode(s).
The electrode according to the invention for electrostatically painting parts made of dielectric or low-conductivity material, intended to come into contact with the part to be painted and to be connected to one of the two poles of a source of electrical power contained in the apparatus, is essentially characterized by its exterior surface which contains at least one jagged portion for engaging the part to be painted, said jagged portion being the location of the so-called peak electrostatic effect.
The description which follows, referring to the attached drawings for explanatory, but not limiting, pu
REFERENCES:
patent: 2662833 (1953-12-01), Helmuth
patent: 3903321 (1975-09-01), Schaad
Parker Fred J.
Societe LCS International
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