To increase the wetting ability and adhesion, Corona treatment systems apply a certain power to the film surface, for a given period of time.
The measure that best represents the degree of treatment achieved is "watt density" (WD) expressed in [W*min/m2] whose basic parameters are:
Given that materials or surfaces react differently to corona treatment, it is the task of the film manufacturer to associate the dyne/cm level achieved by a given plastic film with a given Discharge Density.
The adjustment of the set power can be manual, depending on the rotation speed of the discharge roller and depending on the set watt density (sWD).
The corona treatment process is controlled in three phases:
The innovative Corona Quality Control software enables:
The numerous data visible in the Graphics include: Power set, Power supplied, Watt Density set, Watt Density supplied, discharge roller speed and quantity of discharge electrodes set in the generator.