PE logistics delivery bags, with their unique low-temperature toughness, have become a core packaging material for ensuring the safety of goods in cold chain transportation. This toughness stems from the flexibility of PE's molecular chains at low temperatures, allowing them to maintain elasticity even at temperatures tens of degrees below zero, preventing brittle cracking. During cold chain transportation, goods undergo repeated loading and unloading, stacking, and transportation bumps. PE's flexibility effectively absorbs impact, preventing bags from breaking due to collisions or squeezing, thereby ensuring the integrity of the goods inside.
Temperature fluctuations in cold chain transportation are a critical factor affecting the quality of goods. The low-temperature toughness of PE logistics delivery bags allows them to adapt to temperature fluctuations at various stages of transportation. For example, during transportation from cold storage to refrigerated trucks, ambient temperatures can fluctuate rapidly. While conventional materials may crack due to thermal expansion and contraction, PE maintains its seal through adaptive molecular structure adjustments, preventing the loss of cold air and the intrusion of external moisture. This stability is particularly important for goods requiring strict temperature control, such as fresh food and pharmaceutical products, effectively extending their shelf life.
The puncture resistance of PE logistics delivery bags is closely related to their low-temperature toughness. In cold chain transportation, goods may contain sharp or hard objects (such as bones in frozen meat or metal instruments in the pharmaceutical cold chain). If the packaging material is too hard or brittle, these items can be easily punctured and leak. PE maintains a certain degree of ductility at low temperatures. When subjected to external forces, the molecular chains disperse the stress through localized deformation rather than breaking directly. This property allows PE bags to protect goods while also reducing the risk of cross-contamination caused by packaging damage. The efficiency and cost control of cold chain transportation depend on the reliability of packaging materials. The low-temperature toughness of PE logistics delivery bags can reduce waste during transportation. Traditional packaging materials are prone to cracking and delamination at low temperatures, resulting in damage to goods or the need for additional reinforcement, increasing logistics costs.
The durability of PE allows for reuse, reducing packaging consumption per shipment. Furthermore, PE's lightweight design (compared to materials like glass and metal) reduces transportation energy consumption, further improving the economic efficiency of cold chain logistics. The low-temperature toughness of PE logistics delivery bags is also reflected in their adaptability to complex transportation environments. Cold chain transportation may involve long-distance land, sea, or multimodal transport, subjecting them to multiple challenges such as vibration, humidity fluctuations, and UV exposure. By adding antioxidants and stabilizers, PE maintains its performance during long-term low-temperature storage and transportation, preventing embrittlement or discoloration due to aging. This durability makes PE packaging bags a preferred material for cross-border cold chain transportation, especially for export goods requiring long-term storage.
From an environmental perspective, the low-temperature toughness of PE logistics delivery bags creates a synergistic advantage with their recyclability. Although PE is a plastic material, modern cold chain logistics utilizes optimized formulations and processes to produce PE that is more easily recyclable. Its low-temperature toughness makes the bags less prone to breakage during recycling, improving recycling efficiency. Furthermore, some companies are using bio-based PE or biodegradable additives to further reduce environmental impact and meet the demand for sustainable packaging in cold chain logistics.
The low-temperature toughness of PE logistics delivery bags, through multiple advantages such as molecular structure, impact resistance, and environmental adaptability, provides reliable safety for cold chain transportation. They not only directly protect goods from physical damage and temperature fluctuations, but also improve the overall efficiency of cold chain logistics by reducing waste and transportation costs. With the rapid development of the cold chain industry, technological innovations in PE logistics delivery bags (such as high-density PE and multi-layer co-extrusion structures) will further enhance their low-temperature performance, making them an indispensable packaging solution for food safety, pharmaceutical safety, and other fields.
