Method and apparatus for electrostatically coating a workpiece with paint
First Claim
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1. A method for electrostatic coating of a workpiece with paint, comprising the following steps:
- mixing with air a paint in the form of a powder consisting of a plurality of particles dispersed in air;
electrostatically charging the individual particles forming the powder paint by submitting the paint to an electric ionization field;
projecting the electrostatically-charged powdered paint against a workpiece (11) at the same time as said air is selected through a spraying nozzle (10);
enriching the air to be conveyed to the spraying nozzle (10) with at least a first additive gaseous fluid means for increasing the electrostatic charge induced on the paint particles by effect of the electric ionization field, said first additive gaseous fluid means comprising a noble gas selected from the group consisting of argon, neon, crypton, xenon, radon,
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Abstract
In a method of electrostatic painting, the air to be conveyed towards the spraying nozzle (10) of a gun (9) together with the powdered paint, is enriched with at least one additive gaseous fluid consisting of at least one gas supplied from a feeding bottle (136, 137, 138, 139) and/or vapor obtained by submitting the air to bubbling through a working liquid (115). The additive fluid which has a greater electric conductivity than the air, causes an increase in the paint amount coated on the workpiece (11) in relation to the paint amount sprayed from the nozzle (10).
70 Citations
17 Claims
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1. A method for electrostatic coating of a workpiece with paint, comprising the following steps:
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mixing with air a paint in the form of a powder consisting of a plurality of particles dispersed in air; electrostatically charging the individual particles forming the powder paint by submitting the paint to an electric ionization field; projecting the electrostatically-charged powdered paint against a workpiece (11) at the same time as said air is selected through a spraying nozzle (10); enriching the air to be conveyed to the spraying nozzle (10) with at least a first additive gaseous fluid means for increasing the electrostatic charge induced on the paint particles by effect of the electric ionization field, said first additive gaseous fluid means comprising a noble gas selected from the group consisting of argon, neon, crypton, xenon, radon, - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for electrostatic coating of a workpiece with paint, comprising the following steps:
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mixing with air a paint in the form of a powder consisting of a plurality of particles dispersed in air; electrostatically charging the individual particles forming the powder paint by submitting the paint to an electric ionization field; projecting the electrostatically-charged powdered paint against a workpiece (11) at the same time as said air is ejected through a spraying nozzle (10); enriching the air to be conveyed to the spraying nozzle (10) with at least a first additive gaseous fluid means for increasing the electrostatic charge induced on the paint particles by effect of the electric ionization field, said first additive gaseous fluid means being produced by submitting to bubbling at least a part of said air through at least one working liquid (115) arranged to generate the first additive fluid by evaporation. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification