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1. Material Selection
7-Layer Co-extruded High Barrier Film is usually made of multiple materials through multi-layer co-extrusion technology. The selection of these materials directly determines the performance and environmental protection of the film. The following are some commonly used materials and their characteristics:
Nylon (PA): Nylon is a high-performance polymer with excellent mechanical strength, wear resistance and barrier properties. In the seven-layer co-extruded high barrier film, the nylon layer is usually used as a barrier layer, which can effectively prevent the penetration of gases such as oxygen and carbon dioxide, thereby extending the shelf life of food. However, nylon is derived from fossil fuels, and its production and use may cause certain environmental pollution.
Ethylene/vinyl alcohol copolymer (EVOH): EVOH is a material with high barrier properties and has excellent barrier effects on gases such as oxygen and carbon dioxide. In the seven-layer co-extruded high barrier film, the EVOH layer is usually used in conjunction with the nylon layer to form a more efficient barrier system. EVOH is relatively environmentally friendly because it is polymerized from ethylene and vinyl alcohol monomers by chemical methods and does not contain harmful substances.
Polyolefin (PE, PP): Polyolefin is the structural layer in the seven-layer co-extruded high barrier film, which mainly provides the flexibility and mechanical strength of the film. PE (polyethylene) and PP (polypropylene) are two commonly used polyolefin materials, which have good processing performance and low cost. In addition, some polyolefin materials can be extracted from renewable resources, such as bio-based PE and PP, which have significant advantages in environmental protection.
Adhesive layer: In the seven-layer co-extruded high barrier film, the layers need to be bonded by an adhesive layer. Commonly used adhesives include polyvinyl alcohol (PVA), polyurethane (PU), etc. The selection of these adhesives needs to take into account their compatibility with adjacent layers, bonding strength and environmental protection.
2. Environmental protection
The environmental protection of 7-Layer Co-extruded High Barrier Film is a comprehensive issue involving material selection, production process, waste disposal and other aspects. The following is a detailed analysis of its environmental protection:
Material source and renewability: As mentioned earlier, the materials in the seven-layer co-extruded high barrier film include renewable and non-renewable types. Nylon and certain adhesives are usually derived from fossil fuels, while polyolefins (such as bio-based PE and PP) can be extracted from renewable resources. Therefore, when selecting materials, renewable materials should be given priority to reduce dependence on fossil fuels and environmental pollution.
Production process and energy consumption: The production process of 7-Layer Co-extruded High Barrier Film consumes a lot of energy, including electricity, heat, etc. The consumption of these energy sources not only increases production costs, but also may have a negative impact on the environment. Therefore, optimizing the production process and improving energy efficiency are the key to reducing environmental impact. For example, measures such as adopting energy-saving equipment, optimizing production processes, and improving production efficiency can effectively reduce energy consumption.
Waste treatment and recycling: Seven-layer co-extruded high barrier film will generate waste after use. If these wastes are directly discharged into the environment without proper treatment, they may cause pollution to soil, water sources, etc. Establishing a sound waste treatment mechanism is an important measure to ensure environmental protection. At present, the recycling rate of seven-layer co-extruded high barrier film is relatively low, mainly because its multi-layer structure and complex composition make recycling difficult. With the advancement of technology and the improvement of environmental awareness, it is expected that the environmental impact will be reduced by improving recycling technology and increasing recycling rates in the future. For example, chemical recycling methods are used to decompose waste into monomers or oligomers for reuse; or melt regeneration methods are used to melt waste and reprocess it into new film materials.
Environmental regulations and standards: Governments of various countries usually formulate a series of environmental regulations to regulate the use and disposal of packaging materials. These regulations may include restrictions on the use of certain hazardous substances, requirements for the use of recyclable or degradable materials, etc. Therefore, the production and use of seven-layer co-extruded high-barrier films need to comply with the requirements of relevant regulations. In addition, there are some voluntary environmental standards (such as ISO 14001, etc.) that can be used to guide the production and use of seven-layer co-extruded high-barrier films. These standards generally cover environmental management, resource conservation, pollution prevention and other aspects, which help to promote the environmental protection of seven-layer co-extruded high-barrier films.
