The paper-plastic composite bag is composed of plastic and kraft paper. Usually the plastic layer is a plain woven fabric with polypropylene (PP) or polyethylene (PE) as the base material, while the kraft paper is a refined composite kraft paper, which has the characteristics of high strength, good water resistance and beautiful appearance. It is one of the most popular packaging materials and is widely used in plastic raw materials, cement, feed, chemicals, fertilizers and other industries. Paper-plastic composite bag-composite plastic woven bag is made of plastic woven bag (referred to as cloth) as the base material and is made by casting method (cloth/film composite is two-in-one, cloth/film/paper composite is three-in-one). Mainly used for packaging engineering plastics, rubber raw materials, building materials, food, fertilizers, cement and other powdery or granular solid materials and flexible items. ●Composite woven bag: divided into polypropylene two-in-one bag, polypropylene three-in-one bag, polyethylene two-in-one bag, polyethylene three-in-one bag according to the main material; divided into bottom seam bag, heat sealing bag according to the sewing method bag, outer valve bag and inner valve bag. ●The bags are divided into 450, 500, 550, 600, 650, 700mm according to the effective width. The effective width does not meet the above specification. Paper-plastic composite bag: commonly known as: three-in-one bag (1) Definition description Paper-plastic composite bag: Also known as three-in-one composite paper bag, it is a small bulk container that is mainly transported by manpower or forklift. It is easy to transport powdery and granular materials of small volume, and has the characteristics of high strength, good waterproofness, beautiful appearance and convenient loading and unloading. It is one of the most popular and practical general packaging materials. (2) Process description: Refined white kraft paper or yellow kraft paper is used on the outside, and plastic woven cloth is used on the inside. The plastic particles PP are melted by high temperature and high pressure, and the kraft paper and the plastic woven cloth are combined together. An inner film bag can be added. The form of paper-plastic composite bag is equivalent to sewing the bottom and opening the pocket. It has the advantages of good strength, waterproof and moisture-proof.