The incubator, as its name implies, is used for heat preservation. The incubator not only has the function of heat preservation, but also has the characteristics of safety, environmental protection, portability, freshness and durability, and is widely used in catering, logistics and other industries. According to different materials, the incubator is divided into plastic, foam, metal and wood. Among them, plastics and foams are the most common. Foam incubator, generally PVC plastic, is generally used for low-temperature refrigerated transportation. This kind of incubator is simple in material and light in weight, but generally it can't directly contact with food, nor can it hold food with too high temperature. When the temperature reaches 65℃, harmful substances in disposable foam will penetrate into food and cause harm to human body.