Classification of Composite Packaging Bag Materials

I. Classification System: 3 Core Dimensions + Industry Standard Support

• By structural function: Printing layer (Biaxially Oriented Polypropylene (BOPP), Polyethylene Terephthalate (PET), etc.), barrier layer (aluminum foil, Ethylene-Vinyl Alcohol Copolymer (EVOH), etc.), heat-sealing layer (Polyethylene (PE), Cast Polypropylene (CPP), etc.). Clarify the core function and material selection logic of each layer.
• By base material: Plastic composite (combinations of PE, PP, PET), paper-based composite (paper + plastic/aluminum foil), metal composite (aluminum foil + plastic), bio-based composite (starch-based, cellulose-based). Cover both traditional and new material types.
• By industry standard reference: Introduce Packaging Material safety standards, specify material selection specifications for food, pharmaceutical and other fields, and enhance content authority.

II. In-depth Analysis of Core Materials: Properties + Combination Logic

• Mainstream basic materials: Detail key parameters such as temperature resistance range, barrier performance and cost level of core materials including PE, PP, PET and aluminum foil. Compare the advantages and disadvantages of different materials.
• Typical composite structures: Disassemble common combinations such as BOPP/PE (ordinary Food Bags) and PET/aluminum foil/CPP (vacuum bags). Explain the matching relationship between structural design and functional requirements.
• New material trends: Focus on bio-based and nano-composite materials, highlight advantages such as environmental degradation and high-performance barrier properties, and align with industry development directions.

III. Practical Selection Guide: Scenario Adaptation + Pitfall Avoidance Skills

• Industry scenario matching: Classify by fields such as food, pharmaceuticals and daily chemicals, recommend optimal material combinations accordingly, and specify solutions for core needs such as moisture resistance, high temperature resistance and oxidation resistance.
• Cost and process reference: Compare cost ranges and molding process difficulty of different material combinations to help readers balance needs and budgets.
• Common misunderstanding avoidance: Correct cognitive biases such as "more barrier layers mean better performance" and "environmentally friendly materials have poor performance", and provide scientific selection ideas.