The first patent on electrostatic spraying was issued in 1932. The idea of electrostatic spraying was being examined early in the 1940´s and since then various sprayers and commercial machines have been developed.
One of the first important applications of electrostatics was electrostatic spray coating in the automobile industry. The paint spraying industry recognized the benefits of electrostatic spraying of paint finishing early. Today most all farm machine and appliance manufactures worldwide use various types of electrostatic sprayers for coating and painting applications. Practically all the sandpaper manufactured in the world is produced by electrifying the abrasive particles in deposition on the backing material.
The principle of applying a sealant or antimicrobial spray coating is the same. A charged cloud of antimicrobially active droplets is driven by electrostatic force towards an object or surface. When the charged droplets are emitted at the nozzle of the electrostatic sprayer, those charged particles are forced to move along field lines according to Coulombic forces. Since the electrostatic force is much stronger than gravitational or inertia forces for a small particle, the motion of the charged particle is easily controlled by the electrostatic force.
It is possible for droplets to reverse their flight path and coat areas of the target that would not otherwise be coated with uncharged spray. Such attraction can only occur if electrostatic forces on the droplets are dominant over gravity, inertia, and the force of air currents.
Typically that means droplets less than 100 microns in size, carrying a high charge give best results. Since the distance between the nozzle and the object to be sprayed is relatively wide, a high voltage of a few tens of kilovolts must be applied to get enough induction charge. In electrostatic paint spraying, either corona charging or induction charging is commonly used to get highly charged droplets.
At the University of Georgia in the United States, Dr. Edward Law and his research team recognized if the spacing between the nozzle and the induction electrode was very small, the applied voltage could be much lower. Although there were many different methods of electrostatic spraying, the embedded electrode proved to be the best for water based antimicrobial liquids.
Dr. Law and his team developed the "embedded-electrode electrostatic-induction nozzle". The principle of this nozzle is such that air and liquid enter separately into the nozzle. The air moves at a high speed through the nozzle and disintegrates liquid into droplets. The droplets are charged by induction at the nozzle. High speed air is propelled outward from the orifice of the nozzle.
Microbecide® TC-320 Electrostatic Sprayers use air-assistance for better spray delivery. Air is necessary in electrostatic spraying to cause the charged spray to push deep into complex targets. Electrostatics, with air-assist, plus the right droplet size is a perfect combination for the most effective and efficient application of a spray. The force of electrostatic attraction is strong if the droplets are small and the droplet charge is sufficiently high.
Electrostatic sprayers are ideal for schools, day care centers, nursing homes, clinics and hospitals, gyms and spas, hotels, public transportation, restaurants, mold remediation firms and others for decontamination, disinfecting and odor elimination. They are also used by greenhouses, nurseries, and grounds staff for application of insect control products on plants and flowers.
The Microbecide® TC-320 Electrostatic Sprayer coupled with hospital grade aqueous Ti02 (Titanium Dioxide) solutions provide powerful advantages as natural antiviral, antifungal, antibacterial agents and health defenses against dangerous microorganisms.
To request a demonstration, qet a quotation or discuss your requirements contact us at +601 9311 1101 – or contact a Microbecide® Partner in your region today!