(insulators) are clean and free of grease and dirt. Cleaning of the electrodes should be given special attention, especially the cleaning between the ceramic bars. An accumulation of dirt will prevent an effective cooling of the bars, resulting in overheating, which again causes the ceramic surface to crack. This leads to machine stop, and the defective ceramic bars will have to be replaced before production can start again.
Electrodes covered with dirt will result in an uneven Corona treatment of the film.
It is very important to keep bars and insulators clean. Cleaning can be done with spirits/alcohol.
Check out this quick videoguide on how to clean the cartridge and electrodes:
The film controls the rotation of the backing roll while the tendency drive motor helps the film to overcome the inertia of roll and ball bearings.
A DC-motor is mounted on the endplate of the station and a toothed timing belt between the pulley on the motor shaft and the roll shaft drives the backing roll.
On the motor is integrated a tachogenerator which supplies the electronic controller with information about actual speed. From an external tachogenerator, which is driven by another roll in the production line, the signals are led to the controller and compared with signals from the motor-tacho and thereby the motor speed and the backing roll is synchronized with the main machine.
The Vetaphone TS Skip operates with input from a roto pulse sensor connected to the printing cylinder. With the sensor impulses as a reference, the position and the length of the treated area can easy be adjusted even during production.
Adjustment can be made for one or two generators (A+B) and is done by setting 4 parameters in steps from 1 to 360 degrees of the circumference of the print cylinder or alternative in steps of millimetres.
The unwanted treatment on the “wrong” side can result in blocking problems (not possible to unwind the material) or pin holes in material. Furthermore the “wrong side treatment” can cause less efficiency on the correct side resulting in lower dyne levels.
The most common reason for backside problems is dirt build-up on the backing roller. To avoid this simple clean the roller according the maintenance plan.
Another problem could be an increase of line speed. As the line speed increase (above 350m/min) there will be more air travelling with the material which results in small air bubbles underneath the material over the roller. The air in this gab ionizes and produces backside treatment. The use of a NIP roller can prevent this problem occurring as the NIP simple makes the film wrapping perfect around the roller and not leaving any spots with air bubbles.
The last major problem of backside treatment is creation of wrinkles. Read more about the Corona treatment process here.
Vetaphone has in general 3 types of treater station design, each with it’s on way of adjusting the air gab settings.