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The core materials of 5-layer co-extruded high barrier film include PA, PE, PP, TIE and EVOH. These materials form an organic whole through the co-extrusion process, and each of them assumes key functions. PA provides structural support for the film with excellent mechanical strength and puncture resistance, PE ensures the sealing of the packaging with good flexibility and heat sealing properties, PP gives the film excellent chemical resistance and dimensional stability, TIE ensures that the layers of different materials are tightly combined without stratification, and EVOH, as a high-performance barrier resin, is the core material for blocking gases such as oxygen and carbon dioxide. Its unique molecular structure can effectively prevent gas penetration and build the first protective barrier for sensitive products.
Structural design: precise layout of performance synergy
The design of the five-layer co-extrusion structure is not a simple material superposition, but a precise layout based on functional requirements. The thickness and material proportion of each layer have been repeatedly optimized to achieve maximum performance synergy. From the inner layer to the outer layer, each layer has clear functions and cooperates with each other. The core barrier layer is mainly composed of EVOH, which can effectively delay food oxidation, drug deliquescence, chemical deterioration and other problems, providing long-term protection for product freshness and quality; the adjacent support layer balances the tensile strength and impact resistance of the film through the reasonable ratio of PA and PP, ensuring that it is not easily damaged during packaging, transportation and storage; the uniform distribution of the adhesive layer eliminates the hidden danger of interlayer peeling, so that the five-layer structure forms a whole with unified mechanical properties; the outer layer uses highly transparent PP or PE materials, which not only ensures the structural strength, but also provides a clear visual window for product display.
Core performance: Multi-dimensional guarantee of packaging integrity and safety
The core competitiveness of 5-layer co-extruded high barrier film is reflected in its all-round performance. In terms of barrier properties, with the synergistic effect of EVOH and PA, the film can form an efficient barrier to oxygen, water vapor, volatile substances and ultraviolet rays. This property is particularly critical for sensitive products such as food, medicine, and fine chemicals. It can delay food oxidation and deterioration, maintain the stability of active ingredients in medicines, and prevent chemicals from volatilizing or absorbing moisture, thereby significantly extending the shelf life of products. In terms of mechanical properties, the close combination of the five-layer structure gives the film excellent tensile strength and puncture resistance. Even if it encounters extrusion, collision or falling during transportation, it can effectively resist external impact and reduce product loss caused by packaging damage. The high transparency of the outer layer takes into account both functionality and commercial value, can clearly present the original appearance of the product, enhance consumers’ intuitive understanding of the product, improve the packaging grade through good gloss, and help shape the brand image. The film also has good processing adaptability and is compatible with subsequent processes such as printing and heat sealing to meet the continuity requirements of packaging production.
Customized solutions: Flexible response to adapt to multiple scenarios
There are significant differences in the packaging needs of different industries. The 5-layer co-extruded high barrier film can accurately match multiple application scenarios. For the food industry, the oxygen barrier rate can be optimized by adjusting the EVOH content to provide targeted preservation solutions for baked goods, meat products, etc.; for the pharmaceutical field, the water vapor barrier performance can be enhanced, and an antibacterial layer can be added to meet the requirements of drug packaging for a sterile environment; in chemical packaging, the corrosion resistance and permeability resistance of the film can be improved to ensure the safe transportation of dangerous goods. In addition to adjusting the core performance, the film thickness can also be changed according to customer needs, covering everything from light and thin daily chemical packaging to heavy industrial coils; it supports the addition of special functional layers, such as anti-static layers suitable for electronic component packaging, and anti-fog layers to meet the display needs of refrigerated foods. This customization capability is not a simple parameter adjustment, but is based on a deep understanding of the packaging logic of various industries. Through the systematic optimization of material ratios, structural design and process parameters, it ensures that each customized product can accurately meet the core demands of the application scenario.
