What are the factors that cause poor packaging during shrink film packaging?

What are the factors that cause poor packaging during shrink film packaging? At present, POF shrink film is widely used in many industries, such as food, cosmetics, audio and video products, clothing supplies, toys, crafts, beverages, vegetables, and frozen foods. POF relies on its high shrinkage, environmental protection, non-toxic, economical, light and tough, transparent and glossy. Favored and loved by the packaging market. The temperature is not enough. The working principle of the shrinking machine is actually relatively simple, that is, the matching of speed and temperature. When the temperature is low, the surface of the product will appear wrinkles. And if the temperature is high, the film will be scalded again. Generally, Pof film can be used at a temperature of about 150 degrees, while PE film can generally be used at a temperature of about 170 degrees. The furnace size is inappropriate. There are two situations in which furnace dimensions are not suitable. One is that the furnace is too large, and the other is naturally that the furnace is too small. The situation that the furnace is too large is that the product receives less temperature and most of the heat is lost. Therefore, the shrink packaging machine needs to be increased to a high temperature to shrink better. If the furnace is too small, the film will stick to the inner wall of the furnace, which will be burned. The shrink film has no punctures. This situation is mainly aimed at the full package of POF film. When the user’s product needs to be packaged, some small holes must be pierced on the surface of the shrink film, so that the gas in the film can be emitted through the small holes when shrinking, otherwise the gas will be Inside the membrane, the membrane will bulge up. The speed does not match. The user shrinks different products, the length of the furnace is different, the temperature of the furnace is different, and the required conveying speed is also different. There is no standard value for this speed for reference. The main reason is that the customer needs to test during use. Generally, after several tests , Basically there will be better results. The longer the furnace, the higher the temperature and the faster the speed, which requires customers to decide according to their needs. The quality of the film is too bad, or the width of the selected film is not appropriate, the shrink film applied to the shrink machine needs to meet certain requirements. If the quality of the shrink film is too poor, the shrinking effect must be bad, or there are wrinkles , Or it will break through.