Why does Pet protective film appear crystal point and foreign body point?

How is the crystal point of PET film formed?

PET film left on the surface of the round small points, it is embedded in the film, there is an obvious protrusion, under the irradiation of the light source, there will be a little obvious bright point, that is, the crystal point, it is very big influence on the film, then how is it formed?

As we all know, PET film is formed by two-way stretching and calensing, before stretching and calensing, it is necessary to melt the raw material PET pellets, after melting PET pellets in the nozzle flow out, after two-way stretching, but in the melting process, due to the quality of the particle itself, the temperature of the furnace and other conditions, As a result, some particles are not fused effectively, and thus crystal points are formed during casting elongation. But now, after the improvement of machinery and testing equipment, the current PET film production process has been greatly improved, and the crystal point problem has also been improved a lot.

Similarly, due to the improvement of the process and production method, the quality of the frosted PET film produced is also continuously improved. Therefore, the quality of the film in the future will be better and better with the improvement of the production process and production method. The crystal point and foreign body point of PET protective film is a very common adverse phenomenon in the industry. The crystal point of pet protective film refers to those very small bright spots on the protective film. This situation generally appears on the pet substrate of pet protective film. The crystal point of pet protective film is related to the production environment of the original film, as well as the raw material of pet film and the quality of pet particles.

The appearance of foreign body points is because there are impurities, dust and other fine particles of glue, generally because the workshop environment level is not enough or is an adverse phenomenon of improper operation. Another possibility is that the reaction occurred after the pet protective film was fitted with the object, resulting in the phenomenon of crystallization, which would also be judged as a foreign body point.

Crystal spots and foreign body spots appear in Pet protective film. There are several solutions as follows. One is to improve the cleanliness of the workshop and prevent dust from entering the air to avoid crystal spots or foreign body spots.

The second is to improve the storage and transportation environment, ensure the cleanliness of raw materials and glue, strictly control the order of production, to prevent cross-contamination of different types of raw materials;

The third is to avoid this kind of undesirable phenomenon when choosing glue with the original film, do not ignore the quality in order to pursue the price;

The fourth is that when customers use pet protective film, they should try their best to test the sample first to ensure that the pet protective film material will not react with the paste, and help customers to match the material, so as to avoid this kind of adverse phenomenon.