Corona treatment of PET film surface-film supplier

by:POLYVA     2021-11-14
After the PET film is printed with the pattern design according to the gravure printing method, it can have the function of cleaning up the product packaging, and has an excellent publicity and planning effect on the product. It has other printing materials that cannot be compared with other distinctive advantages. However, the most common polycarbonate plastic film materials (PE, PP, modified polyolefins, etc.) belong to non-polar polymers, and their surface free energy is very low, only 2.9~3.0×10-6J/cm2 . Theoretically speaking, if the surface free energy of a certain type of object is less than 3.3×10-6J/cm2, then basically any kind of adhesive known at this stage cannot be attached. Therefore, in order for the ink to obtain a certain packaging printing fastness on the polyolefin surface, the surface free energy must be increased. According to the current processing technology regulations, it should be 3.8~4.0×10-6J/cm2. So far, the most widely used plastic film reasonable solution in all countries in the world is corona treatment. Because corona treatment is generally carried out in the air, under the impact standards of high pressure and high-frequency spark discharge, on the one hand, weak electrolytes are generated in the gas, resulting in various polar functional groups; on the other hand, in the polyene molecular formula The double strands, especially the double strands on the carbon bond, are easier to open. That way, at the moment of resolution, various polar functional groups have grafted reactions with the surface of the polymer, which in turn changes the surface of the polyolefin from non-polar to polar. It can be said that the surface of the polyolefin after the arc discharge is solved, about 10 to ten meters thick has become a polar chemical substance completely different from the original polyolefin structure, and the surface free energy has been further improved. Reach 3.8~4.0*10-6J/cm2. In addition, the high-pressure high-frequency spark discharge roughens the surface of the plastic film material according to the impact (using a high-magnification transmission electron microscope to observe, you can see the small pipe groove-like unevenness on the surface), thereby improving the wettability of the ink And touch the total area. Thus, the two levels of organic chemistry and physics have improved the adhesion fastness of the ink on its surface. It is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service. Interested parties welcome to inquire! Contact: Wen Feng 13728425799
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