Several main reasons and treatment methods for poor shrinkage of heat shrinkable film labels

Several main reasons for poor shrinkage of heat shrinkable film labels and their treatment methods Release time: 2018-02-03 　　 One, the temperature is not enough. The working principle of 　　 shrinking machine is actually relatively simple, that is, the matching of speed and temperature. When the temperature is low, wrinkles will appear on the surface of the product. 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.　　 Second, the furnace size is inappropriate.　　 There are two situations in which the furnace channel size is 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.　　 3. 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 lost. Inside the membrane, the membrane will bulge up.　　 Fourth, 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.　　 5. The quality of the film is too poor, or the width of the selected film is inappropriate.　　The shrink film applied to the shrink machine needs to meet certain requirements. If the quality of the shrink film is too bad, the shrinking effect must be bad, either there are wrinkles or it will break. Previous: Multi-layer co-extruded polyolefin heat shrinkable film performance advantages and process complete