When you are busy with work, study and other things, it is often difficult to distract yourself from other things, especially meals.

If it takes too long to bring your own food, it will easily get cold, and cooking it fresh is a waste of time, so the "fast food culture" came into being.

One of the representatives is the self-heating lunch box, which can be heated immediately when needed, but what is the principle of this?

The self-heating rice comes with a heating pack, which heats up immediately within 3-5 seconds when it comes into contact with water. The temperature can reach over 150℃, and the steam temperature can reach 200℃. The long heat preservation time can reach up to 3 hours, making it easy to turn raw rice into cooked rice. The heating process is pollution-free, low-cost, and has no safety hazards.

Traditional convenience foods need to be soaked in boiling water before they can be eaten. Some special groups of people, such as outdoor adventurers, tourists, troops and police on missions, cannot eat without boiling water. When eating self-heating rice, you don’t need boiling water or electricity. Tear open the outer packaging and pour the purified water bag inside onto the heating bag. The water and heating bag will automatically mix and heat up. The rice and dishes will be steamed in 8-15 minutes. Edible.

Decipher the ingredients of the self-heating rice heating bag: Invent a multi-purpose self-heating bag, which mainly uses roasted diatomite, iron powder, aluminum powder, coke powder, activated carbon, and salt to form a bag. Rubbing can generate heat to 60℃, which can be used for heating in winter and medical hot compress. Add quicklime, sodium carbonate and water. The temperature can be raised to 120℃ for heating meals or steaming food. The temperature can be maintained for 20 minutes to drop to 100℃, 60 After a few minutes it dropped to 60°C. The material used for heating hot compresses in winter can be used repeatedly. After use, it can still be mixed with quicklime and sodium carbonate, then added with water to heat up, and used to heat food.

The self-heating lunch box is actually the result of the simultaneous reaction between the water bag in the lunch box and the heating agent packaged in non-woven fabric. Once the plastic strip is pulled open, the water bag will be broken. At this time, the exothermic agent will react chemically with the water, causing the exothermic agent to dissipate heat evenly and generate heat up to 120°C. After 5-8 minutes, the temperature of the food will reach 55℃-70℃, and then you can have delicious food. After the heat-generating agent reacts with water, the steam produced is non-toxic and harmless and can be eaten with confidence.

Self-heating box meals generate heat energy through the chemical reaction of the exothermic agent, and heat the meals through thermal reactions, just like how we heat meals on a heater. This reaction does not come into contact with the food and does not damage the nutritional content of the food. Self-heating box meals are a simple and convenient convenience food.

While pursuing convenience, food quality, hygiene and shelf life are also the keys to convenience food. The food in the self-heating lunch box is vacuum-packed in the lunch box after being sterilized at 125°C. After heating for 5-8 minutes when eating, the food can be completely heated through, without making the food worse, ensuring the original flavor and nutrition when eating.

The lunch box is made of PP five-layer composite film, which has fast heat conduction, low oxygen permeability and high freshness retention. The so-called oxygen permeability refers to a measure of the degree to which oxygen penetrates the protective layer. Oxygen permeability affects the degree of freshness preservation. It is understood that the PP five-layer composite film is an edible plastic that is non-toxic and pollution-free. One of the layers is a composite vacuum barrier, which can ensure good food preservation effect.

The self-heating box lunch heating method is characterized by the reaction of calcium oxide (quicklime) with water to generate calcium hydroxide to release heat, and further hydrochloric acid reacts with calcium hydroxide to release heat to heat the meal. The reacting substances may be different, but they all release heat through chemical reactions. This technology has the advantages of rapid and durable heating and low production cost.

Conclusion After understanding the principle of self-heating lunch boxes, I found that there is no complicated principle behind convenience. Sometimes a little simple common sense, as long as it can be applied properly, can create higher quality products. value.