First of all, the vacuum packaging aluminum foil bag has unique physical properties, such as moisture-proof, barrier-proof, light-proof, waterproof, oxygen-proof, high and low temperature, oil-proof, fragrance-preserving, non-toxic, odorless, with good mechanical properties, anti-explosion performance , tear resistance. The common thickness of aluminum foil bags for composite packaging bags is between 10mm and 16mm. Secondly, its product structure is divided into three layers and four layers: PET/AL/CPE and PET/NY/AL/CPE or PET/NY/AL/CPP. Tea packaging bags Vacuum packaging aluminum foil bags: PET/NY/AL/PE (general packaging), PET/NY/AL/CPP (high temperature steaming) Thickness: 70~180μm Bag shape: three-side sealing, independent zipper bag, positive and negative Bag characteristics: PET-packaging and printing is easy to use, NY-low oxygen permeability, PE-general packaging inner layer, CPP-high temperature steaming inner layer AL-strong barrier property, opaque. plastic bag