The main advantage of roll film application in packaging industry is to save the cost of the whole packaging process. Roll film is applied to automatic packaging machinery. There is no need for packaging manufacturers to carry out any edge banding work, just one-time edge banding operation in the manufacturing enterprises. Therefore, the packaging production enterprises only need to carry out printing operation, and the transportation cost is also reduced due to coil supply. When roll film appeared, the whole process of plastic packaging was simplified into three steps: printing, transportation and packaging, which greatly simplified the packaging process and reduced the cost of the whole industry. It is the first choice for small packaging.