What is the corona treatment of plastic film?
Process circuit form:The first form is in the production line of the film, which is commonly referred to as heat film treatment, which is the most common form of treatment. Because the polymer molecules have not yet completed the crystallization of the processing, and therefore the processing effect is strong, but generally only applies to immediately re processing (such as printing, coating or composite) film processing. The processing device is arranged behind the film cooling setting section and prior to the coiling device.The second form is on the film reprocessing line, which is commonly referred to as cold film treatment, and the quality of this process is also related to the experience of the film. If the film deposited after a long storage time, a large number of precipitated additives attached to the surface of the film, the quality of treatment will become worse. In this way, it should be noted whether the spark will cause the possibility of fire on the solvent used. The processing device is provided prior to the printing (or coating or compounding) device.The third form is the combination of the above two forms, which is first processed on the film production line, and then processed second times on the re processing line of the film. It is suitable for the first time to deal with poor quality, or after the first treatment, the storage time has been long, and the treatment effect has been dissipated by many films.
In the corona discharge, a large amount of ozone is produced. Ozone is a strong oxidant which oxidizes the surface molecules of plastics and produces carbonyl compounds, peroxy compounds, and so on. In addition, corona treatment to remove oil, dirt and moisture and other effects, through the modification of the physical and chemical, can significantly improve the plastic surface wettability and adhesion.
Corona treatment of plastic film: high frequency and high voltage is applied on the treatment device to make it corona discharge, resulting in small dense blue and blue sparks. Effect of various kinds of plasma produced by the ionization of air in strong electric field, acceleration and shock processing plastic products within the device, the plasma particle energy ranges from several to tens of EV, and the chemical bond energy of the molecules is close to the plastic, therefore, can break chemical bonds by plastic surface molecules and increase the surface degradation. Roughness.
