Gainsborough can supply a range of in line static
elimination equipment to reduce the static content of both product
and film and so improving line efficiencies. Since its Inception
in the packaging industry approximately seventy years ago, static
control has become an integral part of the packaging processing.
As machinery speeds have increased and materials have changed from
paper to plastics and combination laminates and coatings, the need
for static control has rapidly expanded.
As a result, the last ten years have seen the greatest
increase in the use and development of static control products to
enhance manufacturing processes.
Static is the excess or deficit of electrons on a
material. A regular nonpolar atom has a nucleus with a positive
charge and negatively charged electrons orbiting it. When one atom
comes in close proximity to another, electrons from the orbit draw
or tear away electrons, leaving one atom with an excess of electrons
and the other with a deficit. This process, called ionization, leaves
the atom with the excess carrying a negative charge, while the one
with the deficit carries a positive charge.
Causes of packaging Static
Static in packaging manufacturing is caused
by friction, separation, heat change and improper grounding. Packaging
and material handling equipment often incorporate a combination
of these to accomplish its function.
Static is most commonly caused by friction,
the rubbing of two materials during packaging processing. When a
plastic substrate in web form rubs over a steel roller, or when
a pouch is shaped around a forming collar on a vertical form fill
seal machine, for example, the plastic picks up the negative charge
while the steel roller carries the positive charge. Because metal
is such a good conductor, however, the positive charge is bled off.
The charge on the plastic is not.
Copyright © 2004 Gainsborough Engineering