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Analysis of the problem of water-based ink fading after printing on PET film-film supplier

by:POLYVA     2022-01-30
The printing of water-based ink on PET film should be relatively mature, but there are still many customers who are skeptical. According to the customer's description and actual situation, there is indeed a situation of color fading after printing, so Star of China gives When the water-based ink printing on the pet film does not fade, most of them express a strong need to test to verify whether the color does not fade. Under normal circumstances, when the color fades after printing, the reasons can be found from two aspects: 1. Insufficient adhesion of the ink 2. Insufficient surface tension of the material. You can find the completely dry material 24 hours after printing. Use 3M-600 tape. In the test, if there is a large-scale fading, for example, the fading range reaches 80-90% or even 100% of the test area, we can judge that the ink has no adhesion on the material at all. As for the problem of the ink, or the problem of the material , Can’t make a final conclusion for the time being, we need to continue testing. If there is a small area of u200bu200bcolor fading, it may be caused by the tension of the material surface or the printing process, which has little to do with the ink adhesion, because the small area of u200bu200bcolor fading is likely to be caused by problems in this part of the color, such as insufficient corona. , Just do a corona to the material to solve it. When there is a large area of u200bu200bdiscoloration, we need to check from two aspects. 1. Check that there are many reasons for insufficient ink adhesion caused by ink, such as the type of ink resin itself does not match the material, excessive specific gravity of the pigment leads to reduced adhesion, excessive water addition, etc. are all problems. There are also some uncommon situations that may rarely occur. 2. Check the surface tension of the material. Under normal circumstances, this problem will not occur. Manufacturers will understand their own substrates and there will be no quality problems. However, one thing to note is that the problem of corona is generally Some merchants claim that their water-based inks only need 38 dynes on the surface of the plastic film, but in actual use, they may need to reach 40-55 dynes or more to ensure the printing quality, and some thinner materials cannot be so strong. The corona may cause color fading after printing. Therefore, the corona strength of the film surface and the adhesion of the ink need to be matched. 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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