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What is corona treatment and why is it necessary to corona treat packaging roll film?

Author:Hefengrelease date:2023-08-26Number of visitors:311

What is corona?


Corona, refers to the surface of the charged body in the vapor or liquid material found in the situation of local discharge, often appear in the perimeter of the low-voltage transmission lines and the top of the charged body around the perimeter, can cause ozone, sulfur oxide and other components. Above 110kV substations and routes, often occurs with the corona similar to the light layer, "snorting" "ah mile" sound. Corona can consume electromagnetic energy, and affect electromagnetic waves. Corona is a very uneven magnetic field unique to the collapse of electronic devices - flow injection mode of smooth charging and discharging.


Corona solution


Most of the plastic plastic film (such as polycarbonate plastic film) is a non-polar polymer, the surface support force is low, generally in 29-30mN/m, theoretically speaking, if the surface support force of an object is less than 33mN/m, already know that the ink and adhesive can not be adhered to above the solid, and therefore to carry out the corona method of solution on its surface. The basic principle of the solution is to add high-frequency and high-voltage circuits to the treatment equipment, causing high-frequency and high-voltage charging and discharging, which results in the formation of tiny aggregates of blue-violet flames. The various compounds formed after gas hydrolysis accelerate and impact the plastic film inside the equipment under the effect of strong electromagnetic field. Make the plastic molecular structure of the chemical bond broken and dissolved, enhance the surface surface roughness and surface area. Charge and discharge will also cause a lot of ozone, ozone is an oxidizing agent, can make the plastic molecular structure of air oxidation, resulting in carbonyl and chloroprene and other highly polar functional groups, which in turn enhances its surface energy.


Effectiveness of Corona


Because a variety of high-pressure polyethylene (PE), polypropylene (opp) for the non-polar molecular structure, the surface of the PE film can not be adhered to the polar ink molecular structure. Therefore, before printing on PE film packaging, a spark discharge solution (or corona solution) is carried out to produce a polar surface layer to enhance the color fastness of the fusion with polar inks.


With more than 20 years of experience in surface treatment, Hopfeng Jada 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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