Paper bags can be divided into: pure paper bags, paper-plastic composite bags, coated paper bags, three bags. Pure paper bags can be made from a variety of manual or mechanical automatic three-dimensional square bottom bag molding process need to add the appropriate glue, glue stick tight against the bag tightness is poor, commonly used in disposable bread bags and light cargo bag child ; paper-plastic bags are usually side with PE or CPP base film composite paper, and then re-surface in the printed paper or film matte film into a composite roll film, and then made into various shapes by size conjoined loom bag, since the base film with PE or CPP, good heat seal strength, are widely used to hold food, such as: the seeds, pastries, tea bags, candy and other products, and some sub-package gift bag; coated paper bags are usually made of paper through leaching complex machine straight topped with PE or CPP made from paper or delay the PE layer (intermediate layer) and then with the base film PE complex machine by pouring stream, CPP composite made at the same time, and then printed by the press table, then customer requirements on the joint institutional mechanism bags into the desired bag.

Since the bottom layer is PE or CPP, good heat seal strength, widely used for grasping cake, bread, pastries, tea, seeds, medicines and other products in packaging.