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September 1, 2010 Can you please explain the basics of corona treatment, how it works and how long the treatment will last, where are they best positioned, and finally what can be treated.
Corona treating is a method of increasing the
surface tension of most types of materials. Although you cannot see the
treatment effect with you eye, after treatment the surface of the material will
have become receptive to a wide range of inks, adhesives and other coatings.
Corona treatment works by exposing the surface of a material to an electrical
discharge, often called a corona. It is in the discharge area that oxygen
molecules break up into their atomic form and bond to the ends of the molecules
in the material being treated. It is this process that chemically activates the
surface of the material. It should be understood that the treatment is not
permanent and will degrade over time depending on the material and storage
conditions. The best places for installation are in-line on your press and if
blown film on the extruder itself, as fresh material is much more receptive to
being treated. Virtually any material can be treated such as foils, paper,
polyethylene, vinyl, paperboard, pvc and many more.