Multi-layer co-extruded film has excellent oxygen and moisture barrier properties, shading, impact resistance, heat and cold resistance, moldability, heat shrinkage, oil resistance, heat sealing, surface opening, pitch stability, charging, Transparency and gloss. At present, more and more multi-layer co-extruded films are used in the packaging of meat products, especially in developed countries and regions such as Europe and America. Most of the meat products are co-extruded, and co-extruded films are widely used. Stretch forming, freezing and preservation packaging. In terms of ensuring food safety, multi-layer co-extruded films also have unparalleled advantages. Multi-layer co-extruded films generally use polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). Polyamide (PA, commonly known as "nylon"), ethylene vinyl alcohol copolymer (EVOH), ethylene vinyl acetate copolymer (EVA) and other resins, the Americas, Western Europe and Japan have banned the use of PVDC and PVC packaging of meat products. If printed packages are used, adhesives or inks are used. The inks are mainly polyurethane two-component inks, polyacrylic inks, chlorinated polypropylene inks, and polyimide inks. In the multi-layer co-extruded film, there is basically no additive that poses a threat to food safety. It not only fully complies with the requirements of GB9685-2008, but also fully meets the requirements of the United States and European countries such as FDA and EC.
Multi-layer co-extrusion packaging materials are the development trend of flexible packaging materials. In recent years, multi-layer co-extruded packaging materials have been greatly developed. Multi-layer co-extruded packaging film material can well meet the needs of various packaging applications. It has the advantages of no chemical solvents, reduced use of materials, simple production processes, and low energy consumption. Multi-layer co-extruded packaging materials can be flexibly designed with different barrier properties by adjusting the thickness of the barrier layer and the use of a variety of barrier materials, and can also be flexibly replaced with heat seal layer materials to meet the needs of different packaging. The multi-functionalization of this multi-layer co-extruded film packaging is the mainstream direction of the development of packaging film materials. At the same time, multi-layer co-extrusion compounding is a green composite production process, especially for the current food packaging industry. The raw materials used generally use materials that have been certified by the U.S. Food and Hygiene and Safety Agency, and the raw materials are focused on each layer by specialized feeding pipelines. Unified feeding, no raw materials exposed during the process, no environmental pollution. Its adhesive layer is a modified LLDPE raw material, which is non-toxic to the environment, food, and human body. It will not involve the traditional dry compounding of the so-called solvent residue phenomenon, no exhaust gas pollution, but also different from dry compound, no Solvent compounding and general single-layer extrusion combined processes require drying ovens for processing and therefore, less energy consumption. Multi-layer co-extrusion has the characteristics of low overall cost and more flexible structure, and has gradually become the first choice for food packaging materials.