Why do films, cermets and other materials need corona treatment before printing?

In the printing industry, continuous innovation and advancement of technology have always been the key to promoting the development of the industry. Corona machines are often used on a variety of materials due to their excellent functions. I believe that most people in the industry know why corona machines are used for treatment, but there are still many people who don’t understand why corona treatment is needed. Let’s briefly talk about it below. Here’s why.

Why corona treatment?

Before printing, the surface tension of most films, cermets and other materials is relatively low. If patterns, variable QR codes, garbled codes and other information are directly printed on the surface of the product, the graphics, variable QR codes, garbled codes and other information on the surface of the material will be lost. Garbled characters will easily fall off due to instability or the graphics will be uneven in color. After corona treatment of films and cermets, their surface adhesion will be enhanced, which will make it easier to use inks or adhesives on these materials. Tight and the logo will not fall off easily. In general, corona treatment is used to improve the surface adhesion of materials.

Introduction to corona machine and corona treatment

Stunner, also known as electric spark machine, can be divided into gun-head stunner and flat-plate stunner. Corona treatment uses high-voltage and high-frequency points to generate corona discharge, which ionizes the air into plasma. These plasmas will impact membrane products, break the chemical bonds of membrane molecules, increase surface roughness, and also produce ozone during ionization. , Ozone, as a strong oxidant, can oxidize surface molecules of these materials. In addition to the above effects, corona treatment also has the function of removing oil, water vapor, and dust.

What materials can the corona machine be used on?

The corona machine can be used for films, metals, ceramics, glass and other materials.

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