Corona pretreatment

Our optimont® polyester films have a non-polar, electrically well-insulating and water-repellent surface that is difficult to print or coat.

During film production, the corona pre-treatment is usually carried out "inline". The film is exposed to a high-voltage electrical discharge by running the film web over a polished steel roller and, in close contact with an electrode, is bombarded with an alternating voltage of approx. 15,000 volts. The corona treatment significantly increases the surface tension due to the dispersive and polar interaction, thus favouring subsequent adhesion properties.

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