The heating principle of self-cooked hot pot comes from the heating package inside the packaging box. This heating bag is widely used, and its main components are sodium carbonate, roasted diatomite, iron powder, aluminum powder, coke powder, activated carbon, salt and quicklime. Inject cold water, which can be heated to above 150℃, and the steam temperature can reach 200℃, which is used for cooking food.

1. The heating bag is a bag made of roasted diatomite, iron powder, aluminum powder, coke powder, activated carbon and salt. After encountering cold water, the temperature rises immediately in 5- 10 seconds, and the high temperature can be maintained for 15-20 minutes. The hot pot for heating food can be lowered to 100℃, and it can be lowered to 60℃ after 60 minutes. The whole product will not cause any pollution when it is hot, and there is no potential safety hazard.

2. The material of the lunch box is polypropylene, which is a heated plastic resin made of propylene. Polypropylene is a non-toxic, odorless and highly crystalline polymer. Polypropylene has good heat resistance, and will not deform at 150 degree without external force.

3. This technology has also been applied in military equipment of various countries, and this heating package has been widely used abroad. First of all, the heating package is not directly connected with the dishes. This technology has been used in military equipment for many years. When doing field training, I will cook food with a heating bag. The country's military equipment is very advanced, so many military equipment are very popular in society.

4. There are self-heating rice, self-heating canned food and so on.