The production process of small refrigerated cars in China has gone through three stages. First, the foamed metal skin structure is injected into the whole. The first generation of small refrigerated truck manufacturers adopted this process. This kind of product is easy to form a large number of cold bridges because of the existence of a large amount of metal materials on the car body. On the other hand, the defects injected into the foam insulation layer are not easy to find, and the inherent quality is not easy to guarantee. Furthermore, because the foam material is used for thermal insulation The material is also used as a binder, which is prone to defects such as inadequate bonding, unsatisfactory thermal insulation effects, and high heat leakage (thermal conductivity). Second, the overall injection of foamed glass fiber reinforced plastic structure. It is used in the second and third generation small and small refrigerated truck manufacturers. This product is an improvement on the first stage product. It is light in weight, has a reduced heat leakage rate (thermal conductivity), and has a good thermal insulation effect. However, it has defects such as inadequate adhesion and easy outer skin of the car. Third, the fully enclosed polyurethane plate is bonded to the glass fiber reinforced plastic structure. It is used in the second and third generation small refrigerated truck manufacturers. This kind of product has light weight, low heat leakage rate (thermal conductivity), and good thermal insulation effect. Unsaturated polyester resin is used as a binder, a cushion layer is used, and a rigid polyurethane foam is used for the thermal insulation material, which has low thermal conductivity and high strength. High-strength, high-sealing adhesive for plate bonding, forming a whole. The only drawback is that the loss after polyurethane cutting is relatively large, so the material cost is high. Especially in the current situation of severe increase in prices of chemical raw materials, the production cost of cars is getting higher and higher.
Small refrigerated trucks, special car cold chains involve many links, but as small compact refrigerated trucks, they must strictly implement national emission standards, reduce vehicle carbon dioxide emissions, reduce fuel consumption of small refrigerated trucks, reduce body weight, and improve fuel efficiency. At this stage, many companies are designing lightweight vehicles to further increase the load efficiency of small refrigerated trucks and reduce engine energy consumption.
Cold chain equipment is the basis for the development of the cold chain, and it is also the era of the development of low-carbon economy. The areas on the road to low-carbon development of the cold chain need to focus on, and small refrigerated trucks are undoubtedly the first to receive attention. According to the survey, China currently only has about 40,000 small refrigerated trucks, and the problems of high energy consumption and high pollution are prominent. With the intensification of cold chain demand, this data will inevitably expand year by year, showing that the cold chain industry wants to be healthy. On the road, the improvement of small refrigerated trucks is an important step.
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