The structure of the flexible package can be distinguished by the outer layer, the middle layer, the adhesive layer, the inner layer, and the like.

Outer materials are commonly used: polyester, nylon, stretched polypropylene, paper and so on. Mainly used: anti-mechanical strength, heat resistance, printing performance, optical performance.

Intermediate layer: Mainly used for: barrier property, light-shielding property, freshness preservation, strength and so on. Commonly used: aluminum foil, aluminum film (VMCPP VMPET), polyester (PET), nylon, polyvinylidene chloride (KBOPP KPET KONY)

Inner layer: Mainly sutured, commonly used unstretched polypropylene (CPP), polyethylene (PE) and modified materials.

Ink layer: graphic information transmission and color reproduction, increase promotional effect.