This article is about electrostatic spray coating which is also called electrostatic insulation. It is a discontinued application of prior art which was disclosed in the patent specification and reported in U.S. Patent Application No. 573,812 filed on July 6, 1953.
A description of electrostatic spray coatings may be in simplified form as a sheet of metal having an electrostatic charge applied thereon in a continuous flow. This application is basically a continuation-out-of-part of prior art application Serial No. 5 72,000 filed on July 6, 1953. It is the subject matter of the present invention to develop new and improved electrostatic spray coatings and related techniques. Although known in the art, recent improvements have enabled spray coatings to be applied at lower cost, greater flexibility, and better reliability than were possible in the prior art.
Prior art refers to prior art which has been disclosed or discovered before the advent of electrostatic coatings. It covers those items which are insulating and conductive and which have been previously covered by electrostatic insulating devices. Electrostatic coatings are generally considered to cover any insulating device whether it is in the form of wires, diodes, plastic tubing, and so forth.
There are two general categories of electrostatic coatings, which are known as static and non-static. Non-static coatings are said to be elastic, because they are able to stretch and expand to fill the space that they are coated with while static coatings are not able to do this. The reason for this is that static electricity tends to increase the weight of the metal or plastic tubing, and consequently reduce its flexibility. Therefore, these coatings are generally of a higher thickness than non-static ones.
While there are a number of advantages that electrostatic coatings offer, there are also a number of disadvantages. These include the fact that these coatings are costly, and they take a longer time to dry, which means that the coating will not remain in place during use. They are also more susceptible to abuse, such as nicking. Lastly, electrostatic coatings are said to deteriorate quickly after being exposed to water, which may mean that their usefulness is reduced if they are frequently wet.
The use of electrostatic coatings can be traced back to the 1950s, although their development did not commence until after the Second World War. As electrostatic protection became more important to the consumer, so did the coatings. It was necessary to find a simple solution to provide safe protection against electrostatic discharge, without needing complex or costly modifications to electrical equipment. The simplicity of electrostatic spray coatings owes much to the fact that their application is very straight forward. It does not require any modifications to the equipment in any way, meaning that it is easy to install them, and once in place they offer almost immediate protection.
Electrostatic coatings were initially applied to a small number of objects, including TV monitors, but they soon became more popular with a wide range of products. A common place to find electrostatic discharge (CD) is in the doors and windows of cars. CD is caused when the conductors swell because of static build up, and the phenomenon can be very annoying and even dangerous. Coatings for electrostatic discharge help to keep the conductors safely insulated against CD. They also make the object much safer, by helping to prevent the generation of dangerous gases and vapors.
Electrostatic coatings continue to grow in popularity across a wide range of industries, as their benefits become better understood. They are now used in nearly every sector of the business world and have many advantages over traditional methods. In particular electrostatic coatings reduce the danger posed by electrostatic discharge, which can easily lead to a fire.