Research and Application of Polyethylene Composite Packaging Material PE Base Film

2024-07-19 17:54:12

Polyethylene (PE) is a polymer material obtained by polymerization of ethylene monomers, and its molecular structure is mainly composed of - CH2- repeating units, presenting a linear or branched structure. This structural characteristic gives polyethylene materials excellent flexibility, ductility, and resistance to brittleness. Meanwhile, polyethylene has excellent chemical stability and hardly reacts with any substances at room temperature. It also has good moisture resistance and strong heat sealing properties, making it the preferred material for packaging films.

In the field of composite packaging materials, PE substrate film is widely used as a substrate layer due to its excellent performance. By compounding with other materials such as aluminum foil, paper, nylon, etc., the comprehensive performance of packaging materials can be significantly improved, such as barrier properties, strength, temperature resistance, etc. For example, the composite film of PE and aluminum foil not only has good light and gas blocking properties, but also effectively protects the product from UV rays, oxygen, and moisture, especially suitable for fields such as food and medicine that require high packaging requirements.

The process of preparing PE composite packaging materials usually includes multiple steps such as material selection, mixing, extrusion, stretching, and composite. Among them, melt blending technology is a commonly used preparation method, which involves melting and mixing different materials at high temperatures, and then subjecting them to processes such as stretching and cooling to form composite films with excellent properties. In this process, the application of compatibilizers such as ethylene acrylic acid copolymers (EAA) is particularly important, as it can effectively improve the compatibility between different materials and enhance the mechanical properties and stability of composite membranes.

PE composite packaging materials have shown broad application prospects in multiple fields. In terms of food packaging, PE substrate film can effectively extend the shelf life of food, maintain the freshness and taste of food; In pharmaceutical packaging, its excellent barrier properties and sterility ensure the safety and effectiveness of drugs; In the field of industrial packaging, PE composite film meets the packaging needs of various complex environments with its high strength, wear resistance, tear resistance and other characteristics.

In addition, with the increasing awareness of environmental protection, recyclable and biodegradable PE composite packaging materials have gradually become a research hotspot. By using modification techniques such as adding biodegradable components or employing special processing techniques, the biodegradability of PE substrate films can be improved while maintaining their excellent performance, reducing environmental pollution.

In summary, polyethylene composite packaging material PE substrate film plays an important role in the packaging industry due to its excellent performance and wide application prospects. In the future, with the continuous advancement of technology and the improvement of environmental protection requirements, PE composite packaging materials will inevitably usher in a broader development space.