METHOD AND APPARATUS FOR ELECTROSTATIC PAINTING

摘要

A device and method for electrostatic powder coating include: obtaining continuously a working fluid constituted by air deprived of undesirable substances; supplying the working fluid, between 0.5 bar and 10 bar, in a container containing an amount of coating powder; extracting from the container; a first flow made up of working fluid and powder; atomizing the first flow with working fluid at a pressure of between 0.5 bar and 10 bar; supplying working fluid at a pressure of between 0.5 bar and 10 bar to create a second transport flow made up of working fluid and atomized powder; charging the second flow electrostatically under pressure; and sending the second electrostatically charged flow of working fluid and atomized powder onto a substrate, at a temperature of between −15° C. and +45° C., and a device and method for electrostatic painting including heating/cooling temperature adjustment of the painting mixture.

主权项

1. A method for electrostatic spray painting of a support (50), comprising the steps of:
supplying a carrier fluid to a spray gun (43); supplying a paint flow to said spray gun from a reservoir (48); atomizing said flow of paint with a pressurized jet of carrier fluid to form a painting mixture; and sending a flow of working mixture onto the support (50), wherein, i) said carrier fluid is made up of nitrogen in a range of 80-98%, oxygen in a range of 1-90%, argon in a range of 1-2%, and ii) said carrier fluid is electrostatically pre-charged upstream of entry into said spray gun with positive and/or negative ions according to the desired final electrostatic charge, wherein said flow of carrier fluid that is to be introduced into the spray gun (43) is thermally conditioned in an adjustable way to maintain a temperature of the painting mixture between −15° C. and +45° C.