What is the reason for the low transparency of pof heat shrinkable film?

One of the factors to identify the quality of POF heat shrinkable film products is to look at its transparency. If the transparency is too low, it means that the production process is not good, and the quality will definitely not be too good. Therefore, the general product quality of the heat shrinkable film is very high, and the gloss of the film is also very good. So the question is, why is its transparency low? 1. The entrance temperature of the drying tunnel is too high or there is no temperature gradient, the entrance temperature is too high, and the drying is too fast, so that the solvent on the surface of the glue layer will quickly evaporate and the surface will be skinned. Then when the heat penetrates into the glue layer, The solvent vaporizes and breaks through the film to form a ring like a volcanic vent, which makes the POF heat shrinkable film opaque.　　 2. There is a problem with the rubber roller or the scraper, and it cannot be pressed at a certain point, forming a neutral position, and it is opaque.　　 3. There is too much dust in the air in the production environment, and there is dust in the hot air blown into the drying tunnel after gluing.　　4. The amount of pof heat shrinkable film is insufficient, there are blank spaces, and small air bubbles are sandwiched, causing mottling or opacity. The amount of glue should be checked to make it sufficient and even. Therefore, if you want to avoid the low transparency of POF heat shrinkable film, you must pay more attention to the above mentioned aspects during production and processing, and strictly control every operation step of production, so as to maximize Avoid the influence of external factors on its transparency. At the same time, the author also reminds everyone that, in addition to the transparency of the heat shrinkable film, other aspects must be considered, so that the quality of the selected heat shrinkable film will be better.