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Box Material Advantages & Service Life
Refrigerated truck boxes feature corrosion resistance, zero pollution, and strong anti-aging performance. Premium insulated boxes adopt food-grade FRP glass fiber reinforced plastic for both inner and outer surfaces, while ordinary ones use color-coated steel plates. Tests prove FRP boasts 3-5 times higher anti-corrosion capacity than common metal materials and is easy to repair, greatly extending box service life up to 15 to 20 years.
An unreasonable sandwich bonding structure will cause adhesive aging and layer separation over time, weakening the heat preservation effect, breeding bacteria, and endangering food safety. Meanwhile, water absorption of foam insulation will further reduce thermal insulation performance.
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Refrigeration Unit Classification & Selection Tips
As the core part of refrigerated trucks, refrigeration units are vital to keep goods in good condition. They are mainly divided into three types by power source.
Non-independent units are widely used on medium and small refrigerated trucks for short-distance transport. With simple structure and easy maintenance, they are driven by vehicle engines and have relatively low cooling capacity.
Independent units are equipped on heavy-duty refrigerated trucks for long-haul transport. Powered by separate engines, they work stably regardless of the vehicle’s running status and maintain a stable box temperature.
Trailer refrigeration units are installed on 13-16m refrigerated semi-trailers with strong cooling power and an independent power supply, usually mounted on the front of trailers.
Apart from box volume, cargo types shall also be taken into consideration. Frozen meat and quick-frozen food need a temperature below -15°C, while medicines and vaccines require a constant temperature of 2- 8 °C. Choose proper deep cooling or fresh-keeping units to boost economic benefits.
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Standard Operation for Better Cooling Performance
Standard operation ensures an ideal cooling effect even for world-famous brand units.
01. Pre-cool the empty carriage for 20 to 30 minutes before loading. The unit only maintains rather than lowers temperature, so pre-cooling removes internal heat to avoid cargo loss.
02. Turn off refrigeration units during loading and unloading to balance internal and external air pressure and slow down hot air inflow.
03. Reserve gaps between goods and box walls to ensure smooth cold air circulation and avoid temperature differences inside the carriage.
04. Avoid long-term exposure to strong sunlight, which will cause box panel deformation and damage refrigeration units.
05. Run the unit at least once a month. Replace engine oil before restarting if it has been idle for over six months to prevent blockage.
Choose suitable refrigeration units according to vehicle models and cargo types, and follow correct operating methods to maximize unit performance.
