Composite bags are two or more materials that are combined through one or more dry composite processes to form composite packaging with certain functions. Generally, it can be divided into base layer, functional layer and heat sealing layer. The base layer mainly plays the role of beauty, printing and moisture resistance. Such as BOPP, BOPET, BOPA, MT, KOP, KPET, etc. The functional layer mainly plays the role of blocking and avoiding light, such as VMPET, AL, EVOH, PVDC, etc. The heat-sealing layer is in direct contact with the packaged items, and has the functions of adaptability, permeability resistance, good heat-sealing properties, as well as transparency and openness, such as LDPE, LLDPE, MLLDPE, CPP, VMCPP, EVA, EAA, E- MAA, EMA, EBA, etc. The composite flexible packaging material can finally be used in various packaging bag
s. There are two ways to make bags. One is that the packaging manufacturer uses roll film to fill on the automatic packaging machine, and then forms and packs them into various packaging bags; the other is that the bag-making machine forms various packaging bags and then fills the contents. . Due to the precise control of professional bag-making, the beautiful shape of the composite bag, the large variation of bag-making, and the variety of bag types, in many cases, bags are made first. The main types of composite bags are: three-side sealing bag, eight-side sealing bag), back-sealing bag, organ bag, stand-up bag, etc.
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