Laminates made of plastic can improve the barrier properties of plastic film

[Chinese Packaging Network News] The barrier properties of conventional plastics are often inadequate for certain packaging applications. To address this, barrier-enhanced plastic composite films have been developed. These layered structures not only improve the overall barrier performance but also allow the different components to work more effectively together, resulting in a balanced combination of performance and cost-efficiency. There are several common methods used to produce such composite films. (A) Extrusion Lamination Extrusion lamination is a widely used technique that involves using materials like cellophane, nylon film, or aluminum foil as the base layer. Molten polymers such as PE, PP, EVA, or ionomers are then extruded and pressed onto the base film. In some cases, a second polymer can be sandwiched between two base layers to create a multi-layered structure. This method is particularly effective for producing durable and flexible composite films. (B) Dry Coating Lamination Dry coating lamination offers the advantage of a wide range of substrate options and strong adhesion between layers. However, it's crucial to ensure that all solvents from the adhesive are completely removed during the process. This technique is commonly used with various coatings that enhance the functional properties of the final product. Composite films that include non-thermoplastic materials like paper or aluminum foil are typically manufactured using either extrusion lamination or dry coating lamination. These methods provide the necessary structural integrity and performance characteristics required for such materials. While improving barrier properties is a key objective in composite film development, it is not the sole purpose. Other factors such as flexibility, printability, and mechanical strength are also considered during the design process. (C) Co-extrusion Co-extrusion has become an increasingly important technique in the production of advanced composite films. This method allows multiple layers to be formed simultaneously, offering greater control over material selection and film structure. Proper material choice and structural design are essential to achieving the desired performance in co-extruded films. As a result, co-extrusion is becoming a preferred method for creating high-performance, multi-functional packaging solutions.

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