Abstract: The equipment for preparing for electrostatic painting three-dimensional articles (P) with a predominantly flat extension, made from dielectric or low-conductivity material, which move on and are supported by a horizontal conveyor (T), presents the feature that the conveyor is made from an electrically insulating material, having a resistivity greater than that of the panels (P) to be painted. One or more electrodes (E, 12) are placed in isolated positions, at suitable distances from each other and from the edges of the panels, under the said panels, at least while the powdered paints electrostatically charged to an electrical potential are being fed on to them.

Abstract: Suitable corrugated filter grids (7, 7?) are mounted on the suction intakes (6, 6?) and are positioned with a downward inclination towards the conveyor (4) of the machine, their lower ends allowing drops to fall on to this conveyor. The suction intakes contain further removable filters (9, 9?) and the lower ends of the said intakes are connected to a horizontal collector (10) which is positioned transversely under the conveyor of the machine and whose lower walls are inclined and converge towards a lower area in which is provided a tank (11) which collects all the paint precipitated by the filters located in the suction intakes and which is attached to the inner walls of the system by contact and by impact.

Abstract: Trays are provided with identical vertical spacers which enable the trays to be stacked on top of each other in a centered way, with a suitable or appropriate spacing between them, and enable the various adjacent stacks of trays to be raised and lowered in steps, by an elevating and lowering system which acts only on the bottom tray of each stack. The sides of the stacks of trays of the kiln are thus free and can be engaged by conveyors for the translation of the trays between the stacks, both in a normal operating cycle and in a short operating cycle. However, the lower translation conveyors, which transfer the trays from the stack with an unloading station to that with a loading station, are positioned in the conventional way, i.e., under the stacks of trays and transversely with respect to the trays.

Abstract: The vessel or vessels (7, 7′, 7″) in contact with the solvent used for cleaning the conveyor (T) are designed and arranged in such a way that they are enclosed, and the portion of conveyor belt which is wetted with solvent is also isolated by suitable means from contact with the external environment containing the ventilation air of the painting chamber. In a preferred solution, where rotating scraping cylinders (1, 5) are used, the solvent vessel (7, 7′, 7″) is placed in such a way that it is enclosed by the two successive cleaning cylinders, by the portion of conveyor belt which runs between these cylinders, and by its lateral walls which are as close as possible to the said cylinders and to the said portion of the conveyor belt. At the end of each painting cycle, clean solvent is made to flow into the solvent vessel and the cleaning cylinders and the conveyor belt of the painting machine are temporarily kept active so that they clean themselves.