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Electrostatic Charge

The Uses of Electrostatic Charge.

What are the Uses of Electrostatic Charge?

Electrostatic charge is used in paint spraying (see below)
insecticide spraying, inkjet printers, photocopiers
and the removal of pollution from industrial chimneys.

How is Electrostatic Charge used in Paint Spraying?

Millions of cars are made each year and the steel car
must all be painted to prevent them from going rusty.
The paint is sprayed onto the car bodies and the
process is made more efficient by using electrostatic charge.

The paint spray goes past a high voltage positive needle
as it leaves the spray gun and the tiny droplets of paint
pick up a positive charge. They do this by losing negative
. It is only the electrons which can move.
The car body is then given a high voltage negative charge
which attracts the positively charged paint droplets.

This improves efficiency in two ways.

1. The paint droplets spread out more as they leave the gun.
This happens because they all get the same positive
charge and so they all repel each other. This is better than
coming straight out of the gun as the paint will cover
a wider area more evenly as shown in the picture below.
The same thing happens with insecticide crop spraying.

Electrostatic Paint Spray Gun

2. The paint droplets are attracted to the negative
metal car body, and so less paint will be wasted
by landing on the floor or the walls of the paint shop.

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