Applying high-frequency, high-voltage electricity to the treatment device, causing corona discharge and generating fine, dense purple-blue sparks. After the air is ionized, various plasmas are accelerated and impact the plastic materials within the treatment device under the influence of a strong electric field. These plasma particles typically have energies ranging from a few to several tens of electron volts, close to the energy of chemical bonds in plastic molecules, thus triggering the breaking of chemical bonds on the plastic surface and degradation, increasing surface roughness. During the corona discharge, a large amount of ozone is also produced. Ozone is a strong oxidizing agent that oxidizes the surface molecules of the plastic, producing carbonyl compounds, peroxides, and more. Additionally, corona treatment also serves to remove oil, moisture, and dust. After the aforementioned physical and chemical modifications, the wettability and adhesion of the plastic surface are significantly improved.

Process Route Form:

The first form is carried out on the film production line, commonly referred to as heat film treatment, which is a common processing method. Since the treatment is done before the high polymer molecules have completed crystallization, the treatment effect is strong, but it is generally only suitable for immediate further processing (such as printing, coating, or lamination) of the film. The processing equipment is set up after the film cooling and shaping section and before the winding equipment.

The second form of processing takes place on the film reprocessing line, commonly referred to as cold film treatment. The quality of this processing also depends on the film's history. If the film is stored for an extended period after production, a large amount of additives will precipitate and adhere to the film surface, resulting in decreased processing quality. When opting for this method, it is crucial to consider the potential for electrostatic sparks to ignite the solvent used. The processing equipment is set up prior to the printing (or coating, lamination) equipment.

The third form is a combination of the aforementioned two, involving initial processing on the film production line, followed by a second processing on the film reprocessing line. It is suitable for films that have poor initial processing quality or have been stored for an extended period post-initial processing, resulting in a significant decline in the effectiveness of the treatment.