Composite vacuum packaging bag is what material?

Composite vacuum packaging bag is two or more materials, after one or more composite process and combined together, so as to constitute a certain function of the composite material. Generally can be divided into the base layer, functional layer and heat seal layer. The base layer mainly plays a beautiful, printing, moisture barrier and other roles. Such as BOPP, BOPET, BOPA, MT, KOP, KPET, etc.; functional layer mainly plays the role of barrier, light avoidance, such as VMPET, AL, EVOH, PVDC, etc.; heat sealing layer and packaging items in direct contact, play a adaptability, resistance to permeability, good heat sealing, and transparency, opening and other functions, such as LDPE, LLDPE, MLLDPE CPP, VMCPP, EVA, EAA, E-MAA, EMA, EBA, etc. On the basis of the development of the packaging industry, the packaging of items has also been developed accordingly. From simple paper packaging, to single-layer plastic film packaging, developed to the extensive use of composite materials. Composite film can make the packaging contents with moisture, fragrance, beauty, freshness, light avoidance, anti-permeation, extended shelf life and other characteristics, and thus has been developed rapidly.