What is the principle of self-heating rice?

Self-heating box lunch is produced by the chemical reaction of heating agent, and the food is heated by thermal reaction. The result of the reaction between the water bag in the lunch box and the heating agent packaged in non-woven fabric. Once the plastic strip is pulled apart, the water bag will burst. At this time, the heating agent will react with water, so that the heating agent will radiate heat evenly and generate heat as high as 120℃. After 5-8 minutes, when the temperature of the food reaches 55℃-70℃, you can eat delicious food.

Extended data:

The lunch box adopts PP five-layer composite film, which has fast heat conduction, low oxygen permeability and high freshness. The so-called oxygen permeability refers to measuring the degree to which oxygen permeates the protective layer. Oxygen permeability affects the preservation degree. It is understood that PP five-layer composite film is a kind of edible plastic, which is non-toxic and pollution-free, and one layer is a composite vacuum interlayer, which can ensure good food preservation effect.

The heating method of self-heating box lunch is characterized in that calcium oxide (quicklime) reacts with water to generate calcium hydroxide to release heat, and further hydrochloric acid reacts with calcium hydroxide to release heat to heat meals. The reaction substances may be different, but they all give off heat through chemical reaction. This technology has the advantages of fast and lasting heating and low production cost.

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