refrigerated semi-trailer,Frozen truck is the enclosed van used for transporting the fresh and frozen goods, vegetables and fruits, milk goods and vaccines. It is the van truck equipped with refrigerator device with which inside temperature could be optional of -5°, 10°,-16°,-18°.The surface of van body could be made of fiberglass, aluminum or stainless steel. The padding material with varieties ofthickness is polyurethane foam that could preserve the temperature.