How to ensure the smooth unwinding of PE black and white film rolls

PE black-and-white film is commonly referred to as PE black-and-white co-extruded film, which is mostly used for outer packaging of liquid milk, liquid condiments and other products. It is a composite film made by using three-layer or multi-layer co-extrusion method, using LDPE and LLDPE as basic resin raw materials, and adding black and white master batches to co-extrusion and blow.　　 In order to obtain higher barrier properties, barrier resins such as EVOH and PA are added to co-extrude into a film, and in order to obtain good flexibility and heat sealing effect, mLLDPE resin is added. Therefore, the raw material structure used in the PE black-and-white film can be selected and adjusted according to the package contents and its shelf life, so that it has excellent barrier properties, heat sealability, light resistance and flexibility. In order to ensure that the PE black and white film runs smoothly on the high-speed automatic filling machine, a certain proportion of slip agent and brightener are added during film making to reduce the coefficient of friction of the black and white film and prevent adhesion. However, excessive slip agent will Affect the heat sealability and the adhesion fastness of the printing ink layer.　　 The smoother the PE black and white film, the smaller the friction coefficient, but if the friction coefficient is too small, it will easily slip or run off during unwinding; while the friction coefficient is too large, which will easily cause unsmooth unwinding and reduce production efficiency.　　 Therefore, how to ensure that the smoothness of the PE black and white film used meets the requirements of the production line, it is necessary to select high-precision testing equipment to monitor the key performance of its friction coefficient. At the same time, the timely monitoring of the friction coefficient is more helpful to improve the addition process of ingredients such as slip agents, and guide the processing technology of PE black and white film in a timely manner.　　 Label: Machine roll film