Lightweighting is a primary trend in the technological evolution of box-type semi-trailers, achieved by utilizing materials such as aluminum alloys, high-strength steels (e.g., T700), and honeycomb panels to reduce curb weight. Cargo bodies made of polypropylene honeycomb panels offer excellent mechanical properties-including resistance to bending, torsion, crushing, and impact-alongside sound insulation, thermal insulation, and vibration-dampening capabilities; the density of a 25mm-thick panel can be as low as 4 kg/m². For every 450 kg reduction in vehicle weight, fuel consumption decreases by 1.5 liters per 100 kilometers.
Achieving effective thermal insulation in box-type semi-trailers requires a multifaceted approach addressing materials, structural design, sealing, and temperature control. Suitable insulation materials include polyurethane foam (characterized by high closed-cell content and superior thermal performance), fire-resistant glass wool, or cost-effective polystyrene foam. Structural measures to minimize the thermal bridge effect include the use of thermal-break designs, increased body thickness, or multi-layer insulation configurations. Additionally, sealing must be reinforced at critical points such as doors and windows using high-quality rubber seals, and temperature regulation systems-such as refrigeration or heating units-can be installed.
