Composite bags are classified according to packaging methods: three-way seal, yin-yang bag, middle seal, pillow shaped bag, pentagonal seal bag, self-supporting bag, zipper bag, straw bag, coil, cover material, etc. Functional classification: high yin barrier bag, steaming film bag, anti-static film bag, antibacterial film bag, anti fog film bag, and anti fog film bag

In industry, composite bags also include copolymers of ethylene and small amounts of olefins. Polyethylene is odorless, non-toxic, and has a wax like feel. It has excellent low-temperature resistance (-70~-100 ° C at low operating temperatures), chemical stability, and is resistant to various acid and alkali corrosion (not resistant to oxidizing acids) in this field. At room temperature, polyethylene is generally sensitive to environmental stress (chemical and mechanical effects), and has poor heat aging resistance. The properties of paper plastic composite bag polyethylene generally vary depending on the variety, mainly depending on molecular structure and density.

Paper plastic composite bags can be produced with different densities by selecting different production methods. Polyethylene can be processed using general thermoplastic forming methods (referring to plastic processing). It can be widely used in the production of films, containers, pipelines, monofilaments, wires and cables, daily necessities, and can also be used as high-frequency insulation materials for television, radar, and other applications. Made of non slip kraft paper, it can easily overlap.

The above introduction is about how to improve the heat sealing strength, good moisture resistance, convenient loading and unloading of flexible packaging composite bags. They are currently popular and useful ordinary packaging materials through manual or forklift unit transportation. Water soluble thread composite bags are a new type of packaging bag made by the composite bag machine process with continuous weft winding and no middle seam. The middle of the paper silk composite bag is composed of a three in one composite of mesh nylon water silk and kraft paper bag, with a double-layer world paper bag paper structure inside and outside. Due to the fact that water-soluble nylon fibers can dissolve in 80% hot water without the need for formaldehyde treatment, used waste bags can be hydrolyzed, recycled, and reused without polluting the environment