BOPP smoke film

BOPP cigarette film has become an ideal cigarette packaging material because of its high brightness, good gloss, high stiffness, high moisture resistance and aroma retention. The shrinkage of BOPP film directly affects the smooth and beautiful appearance of cigarettes. Common cigarette packs are mainly divided into two types, one is a soft cigarette case, and the other is a hard cigarette case. For the former, it is generally required that the shrinkage rate of the cigarette film used in packaging is low, and the contraction force is small to prevent excessive shrinkage. The cigarette pack is deformed, and even the cigarettes are squeezed and deformed. For the latter, the shrinkage rate and contraction force of the cigarette film are required to be relatively large, so as to maintain a flat, uniform and compact cigarette packaging effect for a long time. Therefore, strengthening the detection of the shrinkage performance of the cigarette film to ensure the suitability and uniformity of the shrinkage performance has far-reaching significance for improving the appearance and quality of cigarettes. At present, there is no national standard related to BOPP cigarette film in China. The local standard DB53/T 20-2008 'Biaxially oriented polypropylene film for cigarettes' can be referred to for this type of film. There are two main methods for testing shrink film shrinkage: oil bath method and oven method. For example, the method specified in GB/T 10003 is the oven method, and the oil bath method is specified in GB/T 13519. However, no matter which method is used, only the shrinkage rate of the shrink film can be tested, and the force value generated during the heat shrinking or cooling process of the film cannot be tested. The heat shrinkable film manufacturer-the use and application range of the plastic bag heat shrinkable film, heat shrink Lightweight film and low density