Focus on water soluble film application 

PET film, transparent PET film, milky white PET film, release PET film, supply PET motor film, PET film

by:POLYVA     2021-11-22
The yellowing or graying of the PET film, especially when viewed on a roll, can be seen with the naked eye. If there are yellow bars, you must unfold the film or observe the light. Or spread it on a white backing for better identification. Analysis of the cause: the same reason as the gel point, yellow point and black point. Yellowing is caused by poor thermal and oxygen stability of the resin or more air entering the extruder. When the resin is thermally oxidized, it produces larger acetaldehyde. .Because acetaldehyde reduces the antimony trioxide to antimony, the film (resin) turns gray. The appearance of yellow bars usually occurs after replacing the filter or after replacing the resin. The reason is that air may enter during the replacement. People, or part of the resin stays in the machine for too long. It makes part of the resin yellow, and after the formation of the yellow resin, it is impossible to mix well with the normal melting and plasticization, so yellow bars appear. 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.. There are a wide range of products, affordable, technological and environmentally friendly. We strive for excellence in production, honesty and trustworthiness in distribution, The service tenet of warm and thoughtful service and the entrepreneurial spirit of assisting partners to achieve their own careers and provide customers with excellent quality and service. Interested parties welcome to inquire!
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