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Structural features of nine-layer co-extruded barrier films
Nine-layer co-extruded barrier films, as the name implies, are made of nine layers of different materials through precise co-extrusion technology. This multi-layer structure is designed to give full play to the unique performance advantages of each layer of materials and jointly build an all-round protective barrier. From the wear and damage resistance of the outer layer, to the heat seal of the inner layer, to the barrier core of the middle layer, each layer carries an indispensable function.
The role of the PA layer
In the multi-layer structure of the nine-layer co-extruded barrier film, the PA layer is undoubtedly one of the most critical components. As a high-performance polymer, PA is known for its excellent mechanical strength, wear resistance and barrier properties. In the nine-layer co-extruded barrier film, the role of the PA layer is mainly reflected in the following aspects:
Barrier performance: The PA layer has excellent oxygen barrier properties and can effectively prevent oxygen from penetrating into the interior of the package. This is of great significance for extending the shelf life of food and preventing oxidation and deterioration of drugs. At the same time, the PA layer can also resist the intrusion of moisture to a certain extent, further protecting the products in the package from the influence of humid environment.
Mechanical strength: The PA layer has high mechanical strength and can withstand large external forces and pressures. This allows the nine-layer co-extruded barrier film to maintain integrity and stability during transportation and storage, preventing the product from being damaged by packaging damage.
Wear resistance: The PA layer also has good wear resistance and can resist friction and wear from the external environment. This helps protect the product inside the package from physical damage while extending the service life of the packaging material.
Multi-layer synergy to create excellent performance
The excellent performance of the nine-layer co-extruded barrier film is not achieved by a single material layer, but the result of the synergy of each layer of materials. In addition to the PA layer, other layers also play an indispensable role. For example:
Outer layer material: Resin materials with high mechanical strength and wear resistance are usually selected to protect the film from damage from the external environment.
Inner layer material: Focus on heat sealing performance and sealing to ensure the integrity of the packaging container. This helps prevent gas and moisture from penetrating into the interior through the packaging gap, further extending the shelf life of the product.
Barrier layer materials: such as EVOH, work together with the PA layer to form an almost impenetrable barrier. This combination greatly improves the barrier properties of the film, allowing the product inside the package to maintain its original flavor and quality.
Adhesive layer: It also plays a vital role in the nine-layer co-extruded barrier film. It can firmly bond different materials together to form an integral structure, thereby preventing gas molecules from penetrating into the package through the gaps between the layers.
