Paper plastic composite bag is made of plastic and kraft paper. Usually, the plastic layer adopts flat silk woven fabric with polypropylene (PP) or polyethylene (PE) as the base material, and kraft paper adopts refined composite special kraft paper, which has the characteristics of high strength, good waterproof and beautiful appearance. It is one of the most popular packaging materials at present. It is widely used in plastic raw materials, cement, feed, chemical industry, fertilizer and other industries. Continuously improve and improve.