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Uses.
Electrostatic charge
is used in paint spraying,
inkjet printers, photocopiers
and the removal of pollution from industrial chimneys.
Millions of cars are
made each year
and the car bodies 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.
Remember, they do this by losing negative
electrons.
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 is good for two
reasons.
Firstly, 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.
Secondly, the paint droplets are attracted to the negative metal
car body,
and so less paint will be wasted
on the floor or the walls of the paint
shop.
Headings Electrostatic
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Copyright © 2008 Dr. Colin France. All Rights Reserved.