Fluid sprinkling – spraying – and diffusing – Electrostatic type
Patent
1989-08-09
1991-02-19
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
B05B 516
Patent
active
049936441
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for applying water-borne paint by means of high-speed rotary atomizers via direct charging or contact charging, according to the preamble of the main claim.
For many reasons, so-called water-borne paint systems, which are desirable especially for environmental reasons, are nowadays used increasingly for applying paints.
In contrast to a conventional undercoat or top-coat, the water-borne paint system can, for chemically-physical reasons, not be adjusted to the specific paint resistance normally necessary for an electrostatic process. It is therefore required that the normally grounded paint supply line is electrically isolated from the spray systems which are under a high voltage, in order to prevent, in a manner of speaking, a discharge of the high voltage. For this reason, a so-called external charging system, i.e. so-called external charging, has been adopted, but it was found that the efficiency of deposition was very poor, and this becomes particularly important, especially at high relative atmospheric humidities.
By contrast, direct charging gives better values, but the device for carrying out such direct charging operations is expensive.
In the state of the art, it has been proposed to use two paint storage vessels for direct charging, which are both set up to be insulated from the ground. One paint storage vessel then supplies one or more spray systems via a pump and a so-called booth line, while the other paint storage vessel is designed as an intermediate filling station.
The booth ring main and the first paint storage vessel fitted with a pump are here insulated from the ground and, since this paint storage vessel can take up only a limited quantity of paint material but, on the other hand, so-called continuous operation is desired, it must be replenished when a certain paint level is reached. During normal operation, i.e. application of the paint, the first storage vessel is filled from the ring main with paint material and, during this period, this storage vessel is at ground potential. After the valves have been closed, high-voltage potential is applied to this intermediate vessel which is then filled. Filling of the paint storage vessel fitted with a pump and interim filling of the intermediate vessel here proceed fully automatically.
It can be seen that, with such an arrangement, not only two paint storage vessels must be used, but the installation cost is also considerable.
It is the object of the invention to provide a device for applying water-borne paints by means of high-speed rotary atomizers and so-called direct charging, wherein this investment in machinery, as was required in the state of the art, is avoided.
This object underlying the invention is achieved by the teaching of the main claim.
Advantageous embodiments are detailed in the subclaims.
SUMMARY
The invention described herein encompasses a device for applying water-borne paint by means of high-speed rotary atomizers and direct charging or contact charging, having a grounded ring main system for supplying the paint to the spraying elements. A paint storage vessel is inserted between the ring main and the paint spraying element. The ring main leads, upstream of the paint storage vessel, into a change-over mechanism which provides an insulation section between the ring main and two adjoining distribution lines.
The paint storage vessel is subdivided into its interior by a flexible insulation, the area of which corresponds to the inner periphery of one half of the paint storage vessel. The flexible insulation divides the paint storage vessel into two mutually insulated parts and two resulting interior spaces which adjoin both lines connected to the spray system.
The paint storage vessel may consist of plastic.
Expressed in other words, the invention proposes that the usually grounded ring main is connected, with the interposition of an electrically insulating changeover mechanism, to two distribution lines which are connected to the interior of a paint storage vessel. In the interior of thi
REFERENCES:
patent: 4275834 (1981-06-01), Spanjersberg et al.
BASF Lacke & Farben Aktiengesellschaft
Grant William
Kashnikow Andres
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