Why Are Composite Packaging Bags So Popular?

Ⅰ.Core Value: The "Irreplaceable" Advantages of Composite Packaging Bags

1. Functional Advantages

• High Barrier Property: Multi-layer composite structures (e.g., PET/AL/PE) can reduce the oxygen transmission rate (OTR) to below 0.1 cm³/(m²·24h·0.1MPa), which is 1/1000 of that of ordinary PE films, extending the shelf life of food by 3 to 5 times.
• All-Scenario Adaptability: It can withstand low temperatures of up to -40℃ (suitable for frozen food) and high temperatures of up to 121℃ (meeting the needs of retort sterilization). Its tear resistance strength reaches 18 MPa, close to the level of traditional HDPE Bags.
• Extension of Special Functions: Anti-static composite bags can protect electronic components; anti-ultraviolet variants can block more than 95% of ultraviolet rays; and antibacterial products meet the sterile requirements of the pharmaceutical industry.

2. Cost Optimization Chain

• Lightweight Design Reduces Logistics Costs: It is over 60% lighter than traditional glass and metal packaging. For example, in the express delivery industry, reducing the weight of each package by 10 grams can save 132,000 tons of Packaging Materials annually, equivalent to saving 260,000 tons of oil.
• Loss Control Capability: Data from JD Fresh shows that after using composite film packaging, the product damage rate dropped from 12% to 3%, reducing annual losses by over 10 million yuan.
• Long-Term Cost-Effectiveness: Although the unit cost of a single composite bag is higher than that of traditional Plastic Bags, considering factors such as extended shelf life and reduced losses, the comprehensive cost of food enterprises can decrease by 8% to 15%.

Ⅱ. Scenario-Driven Demand

1. Food Industry

• Segmented Scenario Solutions: PET/CPP composite bags for pre-cooked meals achieve retort resistance and high barrier properties, extending the shelf life to 90 days; aluminum foil layers in coffee vacuum bags block oxygen to retain flavor substances.
• Brand Case Studies: Nongfu Spring uses multi-layer composite films for its high-end mineral water to enhance freshness retention and brand image; Shuanghui adopts high-barrier packaging for its cooked meat products to meet food safety regulations.

2. Pharmaceutical Industry

• Adaptation to Core Performance Requirements: Sterile composite bags are produced in 100,000-class clean workshops. Their moisture-proof and light-proof properties meet the stability requirements of pharmaceuticals, with the market size reaching 12 billion yuan in 2024.

3. E-Commerce Logistics

• Lightweight Solutions: Multi-layer co-extrusion technology reduces the thickness of packaging by 20% to 30%. In 2023, the consumption of composite films by JD Fresh increased by 18.7% year-on-year.
• Adaptation to Green Transformation: The penetration rate of degradable composite bags in the express delivery sector is expected to reach 38% in 2025. The PLA/PBAT modified variant can bear 8 kg and be reused up to 200 times.

Ⅲ. Ecological Support

1. Policy Dividends

• Plastic Restriction Orders Drive Replacement: The "14th Five-Year Plan Action Plan for Plastic Pollution Control" requires that non-degradable bags be banned in express delivery outlets by 2025, and the penetration rate of degradable composite bags is expected to reach 15%.
• Improvement of Standard System: The national standard GB 4806.1-2022 (National Food Safety Standard for General Safety Requirements of Food Contact Materials and Articles) strengthens the control of migratory substances in packaging. High-barrier composite bags have become a mandatory option for food enterprises, and 78% of large-scale food enterprises have incorporated them into their supply chain standards.

2. Technological Breakthroughs

• Domesticization of Materials Reduces Costs: Kingfa Science & Technology has realized the localization of EVOH resin, reducing costs by 15%; the localization rate of multi-layer co-extrusion equipment exceeds 60%, lowering the technical threshold for small and medium-sized enterprises.
• Iteration of Environmental Protection Technologies: The degradation rate of PLA composite bags reaches over 90% after 180 days of composting; PBAT-modified composite bags meet the tear resistance standards; chemical recycling technology increases the recycling rate of multi-material composite bags to 40%.

Ⅳ. Practical Guide: Selection Skills of Composite Bags for Different Scenarios

1. Select models according to industry requirements

2. Key Points for Cost Control

• For small and medium-sized batches, prioritize general structures (e.g., BOPP/LLDPE); for batches exceeding 100,000 pieces, customized special functional layers are available.
• For export products, prioritize suppliers certified by FDA (U.S. Food and Drug Administration) and EU 10/2011 (EU Regulation on Plastic Materials and Articles Intended to Come into Contact with Food), to avoid compliance rework costs.

3. Avoiding Pitfalls in Environmental Compliance

• Be alert to "pseudo-degradable" products; recognize the national standard GB/T 38082-2019 (National Standard for Degradable Plastic Shopping Bags) and require suppliers to provide third-party test reports.
• For express delivery scenarios, prioritize single-PE structure composite bags to improve recycling convenience.