Application Analysis of PA/EVOH/PE Multilayer Co-Extrusion Films

With the increasing global demand for barrier performance, safety, and sustainability in the food packaging industry, multilayer co-extrusion technology has become the core process for producing high-barrier films.

Among these, the PA (Polyamide) / EVOH (Ethylene Vinyl Alcohol Copolymer) / PE (Polyethylene) three-layer composite structure stands out for its exceptional synergy, dominating applications such as fresh meat packaging, ready-to-eat meals, and liquid dairy products.

Key Characteristics of Evoh Resin

Outstanding Barrier Performance: EVOH polymer demonstrates extremely low permeability to gases such as oxygen and carbon dioxide. Its oxygen barrier capability is approximately 100 times greater than PA and around 10,000 times higher than PE or PP, providing an exceptional barrier against gas transmission.

Excellent Transparency and Gloss: Thanks to its superior optical properties, EVOH plastic is ideal for packaging applications where product visibility is important, helping to showcase both the appearance and quality of the contents.

Good Mechanical Properties: EVOH granules offers high strength and modulus of elasticity. However, it can become brittle at low temperatures, so performance under varying temperature conditions should be considered in application scenarios.

Environmental Friendliness: Composed solely of carbon, hydrogen, and oxygen, EVOH does not release harmful substances when burned. It is recyclable and aligns with modern sustainability goals.

Advantages of PA/EVOH/PE Multilayer Co-Extrusion Films

Our EVOH resin is widely used in the production of multilayer co-extrusion films with a PA/EVOH/PE structure. This configuration leverages the unique benefits of each layer, including:

High Barrier Properties: The EVOH layer serves as a powerful gas barrier, the PA layer enhances mechanical strength, and the PE layer contributes excellent heat-sealing performance and flexibility. Together, they effectively block oxygen, moisture, and odors—significantly extending product shelf life.

Superior Mechanical Strength: The incorporation of PA improves puncture resistance and tear strength, enabling the film to withstand complex packaging forms and challenging transportation conditions while maintaining packaging integrity.

Excellent Processability: Through multilayer co-extrusion, the materials are perfectly integrated in their molten states, resulting in a film with stable structure and balanced performance. It is suitable for various processes including blown and cast film, offering flexible solutions for diverse packaging needs.

Eco-Friendliness and Sustainability: Unlike traditional dry-laminated films, co-extruded films require no solvent-based adhesives, eliminating the risk of residual solvents and meeting stricter environmental standards. Additionally, EVOH material’s recyclability contributes to sustainable packaging development.

Cost-Effectiveness: By optimizing layer structure and thickness, co-extruded films maintain excellent performance while reducing material consumption and production costs, delivering significant economic benefits to customers.

 Main Application Fields

Thanks to their excellent performance, PA/EVOH/PE multilayer co-extrusion films are widely applied across multiple industries:

Food Packaging: Ideal for packaging oxygen-sensitive products such as meat, seafood, dairy, and juices. Their superior barrier properties help preserve freshness, flavor, and quality.

Pharmaceutical Packaging: Suitable for pharmaceuticals and medical devices requiring high barrier and safety standards. These films ensure product stability and safety throughout storage and transportation.

Industrial Packaging: Used for chemical products, pesticides, and other substances that demand high barrier and chemical resistance. They prevent leakage and contamination, ensuring product quality and environmental protection.

PA/EVOH/PE multilayer co-extrusion films have become a vital solution in the high-barrier packaging sector, thanks to their exceptional performance and broad application prospects. We will continuously enhance our product quality and technical capabilities to deliver superior products and services.