Laminates made of plastic can improve the barrier properties of plastic film
2025-09-18 11:44:19
[Chinese Packaging Network News] Plastic materials often suffer from poor barrier properties, which can limit their application in packaging. To address this issue, barrier-enhanced plastic layered composite films are widely used. These composites not only improve the barrier performance but also allow each component to function more effectively, resulting in a well-balanced combination of performance and cost efficiency. There are several common methods for producing such composite films.
(A) Extrusion Lamination Composite Method
The extrusion lamination method typically uses cellophane, nylon film, or aluminum foil as the base layer. Then, thermoplastic polymers like PE, PP, EVA, or ionomers are melted and extruded onto the base film under pressure. In some cases, a third layer can be sandwiched between two base films to create a multi-layer structure. This technique is particularly effective for creating strong, durable, and moisture-resistant packaging solutions.
(B) Coating Dry Lamination
The coating dry lamination method offers flexibility in choosing substrates and provides high adhesion strength. However, it's crucial to ensure that all solvents used in the adhesive are completely removed during the drying process. This helps maintain the integrity and safety of the final product. Common coatings used in composite films include acrylics, polyurethanes, and other polymer-based materials that enhance barrier properties and mechanical strength.
Composite films containing non-thermoplastic materials like paper or aluminum foil are generally produced using either of the above two methods due to their structural and thermal limitations.
One of the main objectives of laminating materials is to enhance barrier properties, but it's not the only goal. Other important factors include improving mechanical strength, flexibility, and aesthetics, depending on the intended use of the packaging.
(C) Co-extrusion
Co-extrusion has become an essential technique in the production of advanced composite films. This method allows multiple layers to be formed simultaneously, offering greater control over material selection and layer design. It’s especially useful when creating films with specific barrier, optical, or functional properties. Proper material selection and layer configuration are key to achieving optimal performance in co-extruded films.
Drawer Slides,heavy duty drawer slides,drawer runners,soft close drawer slides,cabinet drawer slides
Foshan Nanhai Ranming Lijiali Hardware Co., Ltd , https://www.lijialihardware.com