The origin of composite packaging bags

I. Origin Context: Dual Drivers of Demand Gaps and Material Revolution

• The rise of the plastic industry in the mid-20th centuryexposed shortcomings of traditional paper and cloth packaging in water resistance, freshness preservation, and other properties, failing to meet thestorage and transportation needs of industries such as food and chemicals.
  
  
• The gradual popularization of lightweight, low-cost plastic materialslaid the foundation for multi-layer composite technology, making laminated composite Packaging Bags the optimal solution to overcome the performance limitations of single materials.
  
  
• The recovery of the global economy accelerated commodity circulation, raising requirements for packaging's barrier properties and durability, directly spurring technological exploration of composite packaging.

II. Technological Traceability: Three Key Stages from Embryo to Maturity

• Initial Stage (1950s-1960s): Simple lamination technology emerged, with early double-layer composite structures (e.g., PE/PP) achieving basic protective functions, but with limited production capacity and performance.
• Development Stage (1970s): Coating and heat-sealing processes improved, multi-layer composite technology was commercialized, and materials such as aluminum foil and nylon were incorporated to enhance barrier properties, expanding application scenarios to pharmaceuticals and logistics.
• Standardization Stage (late 20th century-early 21st century): Industry standards were gradually established, and domestic core materials like EVOH barrier films achieved commercialization, laying the foundation for subsequent environmental and intelligent transformation.

III. Industrial Diffusion: Globalization and Localization Evolution After Origin

• Technology Dissemination Path: Originating in Europe and the United States, it gradually shifted to Asian manufacturing hubs, with industrial agglomeration forming in the Pearl River Delta and Yangtze River Delta in China.
• Localized Innovation: Domestic enterprises broke through core technologies such as nine-layer co-extrusion, raising the localization rate of equipment to 79%and promoting the large-scale application of laminated composite Packaging Bags.
• Derived Trends: Driven by environmental policies, the shift from petroleum-based materials at the origin to degradable materials such as PLA/PBAT formed a complete cycle of "origin-iteration-upgrade".