The necessity of film corona treatment:

The physical and chemical state of the surface of plastic film directly affects the amount of ink and adhesive transfer and adhesion state on it. In order to ensure that the plastic surface has good printability, to ensure that its surface tension is higher than the surface tension of the ink or adhesive, and PE, PP plastic is non-polar waxy polymer materials, chemical properties are stable, low surface tension, such as polyethylene's surface tension value of 31 × 10 ^ - 3N / m, the ink adhesion is extremely poor, coupled with the blowing of the film when the addition of the openings, antistatic agents, aging agents and other effects. Difficult and ink or adhesive bonding. Therefore, the film must be activated before printing, roughening and other pre-treatment, in order to obtain good adhesion of the film. Corona treatment is a very important film processing film treatment process, commonly known as high-frequency voltage on the surface of the plastic film electrostatic treatment, so that the film surface has a higher degree of adhesion, in order to facilitate the film's post-processing, such as printing, coating, laminating and so on.

Corona treatment method has the following advantages:

① a wide range of treatment materials, can be used for polyethylene, polypropylene, polyvinyl chloride, polyamide, polyester, polycarbonate, fluorine plastics, and a variety of corresponding copolymers;

② processing time is short, fast, can be processed in the production line;

③Simple operation and easy control;

④ Corona treatment involves only a very shallow range of the surface layer of the plastic, generally only nanometer orders of magnitude, basically does not affect the mechanical properties of the products;

⑤ No waste liquid discharge, basically no pollution of the environment.

Corona treatment form and classification:

Corona treatment of according to different needs, roughly in 3 links. That is, film online corona treatment; film processing line corona treatment; the combination of the two, two treatments.

Film production online corona treatment. This is commonly known as hot film treatment, which is the most common form of treatment. Since the treatment is carried out before the polymer molecules have finished crystallizing, the treatment effect is strong, but it is generally only applicable to film treatment for immediate reprocessing (e.g., printing, coating, or laminating). Generally, the corona treatment unit is set up behind the film cooling and shaping section and before the winding unit.

Corona treatment on the film post-processing line, commonly referred to as cold film treatment, this form of treatment quality is also related to the film twisting time. If the film is stored for a long time after production, the precipitated additives are attached to the surface of the film in large quantities, increasing the quality of the film after corona treatment. And also pay attention to the corona generated sparks whether the solvent used to produce the possibility of fire. General corona treatment device is set in the printing (or coating, composite) device before.

The next is a combination of the two forms, where the film is first treated on the production line and then treated a second time on the post-processing line of the film. It is suitable for films that have been poorly treated the first time, or have been stored for a long time after the first treatment and the effect of the treatment has faded considerably.

According to the different requirements of film use, corona treatment can be divided into film single-sided or double-sided corona treatment. For high-speed casting production lines, some also use multiple electrodes to meet the requirements of the surface tension of plastic films in the later stages of the process.

With more than 20 years of experience in surface treatment, Hefeng Jialda is a global leader in providing professional solutions for customers. Our rich experience in industry applications and production lines enables us to provide the most efficient and precise solutions to our customers, and we are proud to say that we have sold more than 20,000 corona treaters worldwide.

Our core competence comes from the fact that we never stop launching new products and designing molds, and we invest heavily in new product development. It is this guiding principle that sets us apart and allows us to be a true solutions company in the industry. From the design of the solution to the final inspection of the equipment, we pay meticulous attention to every detail to ensure that the quality of our products and customer service meets the highest standards, and with our highly qualified service team and experienced technicians, we have gained an international reputation as a solid and reliable partner.

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