Under the attack of extreme weather, courier bags are prone to aging, brittleness, and breakage, which affect the safety and reliability of express delivery. To ensure its anti-aging performance, it is necessary to comprehensively improve the ability of courier bags to cope with harsh environments from the aspects of raw material selection, production process improvement, additive optimization, surface treatment enhancement, storage and transportation control, use specification formulation, and recycling and reuse.
The quality of raw materials is the key to laying the foundation for the anti-aging of courier bags. Choose high-molecular-weight, stable-performance high-quality polyethylene resin, whose molecular chain structure is tight and has stronger resistance to external erosion. Different types of polyethylene, such as linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE), have their own characteristics in weather resistance, and reasonable combination can complement each other. Pure and high-quality raw materials, with few impurities and uniform performance, can effectively reduce the problem of accelerated aging caused by material defects themselves, and provide a good material premise for the subsequent improvement of anti-aging performance.
The production process has a direct impact on the anti-aging performance of courier bags. In the molding processes such as blow molding and cast film, it is crucial to accurately control parameters such as temperature, pressure and cooling speed. Too high a temperature will break the polyethylene molecular chain and reduce the material performance; too low a temperature may lead to poor plasticization and affect the strength of the product. Appropriate processing temperature and cooling conditions can form a uniform and stable molecular structure inside the courier bags, enhancing their ability to resist extreme weather. At the same time, the use of advanced production equipment and mature process technology can reduce the internal stress and defects generated during the production process, and avoid these factors from becoming the cause of aging.
Adding additives is an important means to improve the anti-aging performance of courier bags. Antioxidants can effectively capture free radicals, inhibit the oxidation reaction of polyethylene, and delay the aging of materials; light stabilizers can absorb or quench ultraviolet energy, reduce the damage of ultraviolet rays to PE molecular chains; heat stabilizers work in high temperature environments to prevent the material from being degraded by heat. By reasonably matching different types of additives and using appropriate addition methods, the additives are evenly dispersed in the PE material and work together to significantly enhance the anti-aging ability of express bags in extreme weather. For example, for express bags used in areas with strong ultraviolet rays, increasing the content of light stabilizers can effectively reduce the damage of ultraviolet rays to the bags.
Surface treatment can add an anti-aging protective barrier to courier bags. By applying an anti-aging coating, a dense protective film is formed on the surface of the courier bag to isolate aging factors such as ultraviolet rays, moisture, and oxygen from direct contact with the PE material. The coating material must have good adhesion, flexibility, and weather resistance to ensure that it does not fall off or crack under various extreme weather conditions. In addition, surface modification technology can also be used to change the chemical structure and physical properties of the surface of the PE material, such as increasing the hydrophobicity of the surface, reducing aging caused by water penetration, or improving the surface's UV resistance to resist erosion by aging factors from the surface.
Reasonable storage and transportation methods are necessary measures to ensure that the performance of courier bags is stable before they reach the use stage. When storing, place the courier bags in a cool, dry, and light-proof environment to avoid direct sunlight and humid air. At the same time, control the temperature and humidity of the storage environment to prevent the courier bags from accelerating aging due to long-term exposure to high temperature and high humidity. During transportation, use closed transport vehicles to avoid exposing the courier bags to bad weather, and prevent them from being wetted by rain, exposed to the sun, and other situations that damage their anti-aging properties. In addition, handle the courier bags with care during loading and unloading to prevent the surface of the courier bags from being scratched or damaged, which would damage their protective structure.
Formulating correct usage specifications will help extend the anti-aging life of courier bags in practical applications. During use, express delivery practitioners should avoid excessive folding and rubbing of courier bags to prevent damage to the internal structure of the material due to mechanical stress and reduce the anti-aging performance. At the same time, when packaging items, avoid putting sharp and corrosive items in direct contact with the courier bags to prevent the bag body from being damaged or chemically reacting, which will accelerate aging. In addition, for courier bags that are not used temporarily, they should be properly kept in accordance with storage requirements to avoid random stacking and exposure to the outdoors to ensure that they still have good anti-aging performance when used.
The recycling and reuse link is also related to the improvement of the overall anti-aging performance of courier bags. Through scientific recycling and processing technology, used courier bags are classified, cleaned, and recycled to remove the aged and degraded parts and retain the materials with better performance. In the regeneration process, new raw materials and anti-aging additives are appropriately added to make up for the decline in material performance so that the recycled PE materials can still meet the anti-aging requirements of courier bags. This not only reduces waste of resources, but also helps to form a sustainable production cycle, ensuring the anti-aging performance of courier bags in extreme weather from a full life cycle perspective.
