Electrode Assembly For An Electrostatic Atomizer

Abstract

The invention relates to an electrode assembly for an electrostatic atomizer, in particular for a rotation atomizer, having an electrode holder arrangement (101) for holding at least one electrode (108) creating an electrostatic field about a symmetrical axis (105), wherein there is a dielectric material for influencing a discharge current component extending in the direction of the symmetrical axis.

Description

technical field [0001] The invention relates to the field of coating workpieces by electrostatically supported atomization, in particular by electrostatic rotary atomization. Background technique [0002] For coating workpieces such as motor vehicle bodies, electrostatic atomizers, in particular electrostatic rotary atomizers, are used which are provided with so-called external charging, for which purpose the atomizer is exposed to an electrostatic field generated by external electrodes. The coating liquid is thus charged by attaching ions and transferred to, for example, a grounded workpiece, as described, for example, in laid-open publications DE 10 202 711 A1 and EP 1 362 640 B1. [0003] Publications US 2007 / 0039546 A1, US 5 163 625 A, US 5 044 564 A, DE 10 205 593 A1, DE 37 09 508 A1, DE 36 09 240 A1 and DE 10 2005 000 983 A1 disclose other electrostatic coatings device. [0004] A disadvantage of the known external charging concept is that the external electrodes req...

AI Technical Summary

Problems solved by technology

[0004] A disadvantage of the known external charging concept is that the external electrodes required to generate an electrostatic field make it difficult to coat small areas and confined workpieces such as are found inside a workpiece or in the interior area of ​​a motor vehicle door or in the entrance area of ​​a motor vehicle body, or Difficulty coating closely connected individual parts on item carriers, especially accessory parts with small distances such as bumpers, due to their size

[0005] Furthermore, due to the compact construction, expensive and extensive and often complex galvanic isolation must be provided especially for the use of conductive coatings such as water-based or low-resistance solvent-based coatings, especially those with high solids content

In addition, it is difficult to clean such electrostatic atomizers, since usually six to eight external electrode fingers are used, forming the external electrodes, which must be cleaned or replaced individually

In addition, for compact direct charging applications in which the as-yet-atomized paint is placed directly at a high voltage potential, expensive and extensive and often complex potential isolation must be provided especially for the use of conductive paints (e.g. water-based paints)

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