The injection molding process injects molten plastic into a closed mold through high temperature and high pressure, and after cooling and solidification, forms a solid structural product. Its molding process is similar to "precision injection molding", which can achieve high-precision replication of complex geometric shapes. The blow molding process first produces a hollow billet, which is then inflated with compressed air to fit the inner wall of the mold, forming a hollow structure, similar to "blow molding", which is more suitable for producing lightweight container products. Injection molded trays have higher structural strength due to their solid structure, while the hollow design of blow molded trays has more advantages in weight reduction and cost control.
The surface of the injection tray is smooth and flat, and can be designed as a grid or flat structure. The bottom supports various support forms such as Sichuan and Tian characters, making it suitable for fields such as precision electronics, food and medicine that require high cleanliness. Blow molded trays usually have groove structures on their surfaces and can only produce double-sided trays. They have outstanding impact resistance and low temperature resistance, and are widely used in harsh environments such as chemical and cold chain logistics. For example, the transportation of automotive parts often uses injection molded pallets to ensure dimensional stability, while the storage of chemical raw materials tends to use blow molded pallets to address corrosive challenges.
The injection molding process adopts single molding, with a short production cycle and high yield rate, suitable for large-scale standardized production, but the mold manufacturing cost is relatively high. The blow molding process involves two stages: preform manufacturing and inflation. The cooling and shaping time is relatively long, but the mold cost is relatively low, making it more suitable for small-scale customization needs. In the current market environment, injection molded pallets dominate the food and beverage industry, while blow molded pallets are gradually gaining recognition in heavy-duty logistics scenarios due to their long lifespan characteristics.
With the application of new materials, injection molding processes are improving toughness through copolymer polypropylene (PP) modification, while blow molding processes use high molecular weight polyethylene (HWMHDPE) to enhance fatigue resistance. The introduction of automation technology enables injection trays to achieve higher precision, and blow molding processes also reduce waste rates by optimizing mold exhaust design. In the future, the application of injection molded pallets in intelligent warehousing systems and the recycling value of blow molded pallets in the circular economy will become the focus of industry innovation.
2025-11-19
