How work corona treatment?
Corona treatment is a technique which is used to modify the surface of certain materials with chemically inert and nonporous surfaces, low tension surfaces,
as happens in most plastic materials. This feature makes them not receptive for bonding with printing inks, coatings and adhesives.
This technique is also used for cleaning and degreasing different materials.
Al though the results are invisible at first glance, the corona treatment application
to the surfaces of these materials (by modifying their molecular structure), increases its surface tension, providing greater power of adhesion and wettability on their surfaces.
The corona treatment is produced by using
a high voltage and high frequency generator,
a voltage transformer, and a treater station equipped with a electrode/counter-electrode system, with a dielectric between them.
This technique was developed in 1951 by a Danish engineer called Eisby Verner. One of his clients had asked him to find an efficient and controllable solution to allow printing on plastics. It occurred to him that the use
of a high-voltage electrical discharge at high frequency may be effective in treating the surfaces of such materials.
Corona treatment was first implemented in extrusion lines
for plastic films, later was incorporated into printing, lamination and adhesivation lines for plastics and metallized films.
On plastics increases the adhesion of inks, adhesives, coatings and laminates.
On metals works cleaning and degreasing, improving their adherence.
On woven increases the wettability, improving the printing quality on them.
On paper and board increases the wettability, achieving improvements
in printing, adhesion and compaction.
No conductive films