Solution to corona breakdown film
Corona breakdown of films is a common phenomenon that can be solved by:
Corona discharge treatment. This is a common method that uses a corona discharge on the surface of the film to increase the affinity of the film surface, making it more receptive to printing inks, adhesives or decorative coatings. During the treatment process, the polymer material passes between the electrodes and the sensing roller. When the applied voltage reaches the breakdown voltage of air, a discharge occurs between the electrodes, generating plasma, which chemically reacts with the polymer surface to form polarity. group.
Adjust processing conditions. In actual operation, the effect can be improved by reducing the traction rate, treating while it is hot, etc. The effect of corona treatment is closely related to the electrode gap, frequency and impedance matching of the power supply, so these parameters need to be adjusted to achieve the best treatment effect.
Solve the problem of unevenness. If the processing is uneven from left to right across the width of the film, it may be because the electrode gap is uneven. The gap between the electrode and the back roller needs to be adjusted and calibrated to keep the normal gap between 1.5~2.0mm to avoid insufficient discharge and uneven processing.
Use a corona discharge treatment device. The device uses rod-shaped electrodes for discharge processing, and the spokes are coated with dielectric materials to avoid arc discharge caused by corona discharge. Dielectric materials need to be resistant to high voltages and resistant to aging in ozone.
Troubleshoot equipment issues. If there are problems such as overheating of the generator cabinet and strong ozone smell, it is necessary to regularly clean the fan and filter to ensure ventilation, or adjust the power matching of the ozone fan and the corona system, ensure that the fan wiring is correct, avoid reversal, and regularly check the fan and pipelines. .
Through the above method, the problem of corona breakdown of the film can be effectively solved and the surface treatment effect of the film can be improved.
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