Analyze what causes the yellow or gray color of the PET release film or the yellow stripe-film supplier

PET film, especially when it is rolled into a reel, turns yellow or grayish in color. It can be seen with the naked eye. If there are yellow bars, the PET release film must be unrolled or observed under the light. Or spread it on a white backing for better identification. Analysis of the cause: the same reason as the gel spots, yellow spots and black spots. The yellowing of the PET release film is due to poor thermal oxygen stability of the resin or a large amount of air entering the extruder. When the resin is thermally oxidized, it produces a large amount of air. In the case of acetaldehyde. As acetaldehyde reduces the antimony trioxide to antimony, the film (resin) becomes gray. The appearance of yellow bars usually occurs after replacing the filter or after replacing the resin. The reason is at the time of replacement. Or air enters 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 these yellow resins, it is impossible to mix well with the normal melting and plasticization, so there are yellow bars Appeared. 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.. There are a wide variety of products, affordable, technological and environmentally friendly. We strive for excellence in production. The service tenet of honesty and trustworthiness, enthusiasm and thoughtful service, and the spirit of assisting partners to achieve their own careers, provide customers with excellent quality and service. Interested parties welcome to inquire!