Analysis of the material composition of the composite bag

The composite bag is composed of two or more materials that are combined through one or more dry composite processes to form a composite package with a certain function. Composite packaging can be divided into base layer, functional layer and heat seal layer. The base layer mainly has the functions of beauty, printing, moisture resistance, etc., and is the most important outer layer of the packaging bag. Such as BOPP, BOPET, BOPA, MT, etc. The functional layer mainly plays the role of barrier and light protection, such as VMPET, AL, EVOH, PVDC, etc. The heat-sealing layer is in direct contact with the packaging articles, has adaptability, permeability resistance, good heat-sealability, and transparency, such as LDPE, LLDPE, MLLDPE, CPP, VMCPP, EVA, EAA,etc.

Composite flexible packaging materials need to be made into various packaging bags before they can be used at the end. There are two ways to make bags. One is that the packaging manufacturer uses roll film to fill on an automatic packaging machine, and the packaging is formed into various packaging bags; the other is that the bag making machine makes various packaging bags and then fills the items. Now professional bag-making technology is precisely controlled, the appearance of the composite bag is beautiful, the bag-making changes are also large, and there are many types of bag types.Therefore, in many cases, bags are made first.