What is the working principle of insulated lunch boxes? What problems should be paid attention to in food storage of insulated lunch boxes?

The insulated lunch box can keep the temperature of our food, even in the cold winter, the food will not cool down quickly. Next, Bian Xiao will tell you about the working principle of insulated lunch boxes and what problems should be paid attention to in food storage of insulated lunch boxes.

1. What is the working principle of the insulated lunch box?

The insulated lunch box is composed of ordinary lunch boxes, with an insulated shell, the inner and outer layers filled with foam plastic, and the inner layer plated with metal film. This design is to reduce heat loss from three aspects: conduction, radiation and convection. Some insulated lunch boxes will also install an electric heating device between them and the shell, and they can also use electric heating to heat food.

The insulated lunch box is generally a container made of double-layer plastic or stainless steel, with a vacuum layer or heat insulation layer. The top is covered and sealed tightly. The vacuum layer or heat insulation layer can delay the heat dissipation of food inside, thus achieving the purpose of heat insulation.

Second, what problems should be paid attention to in food storage of insulated lunch boxes?

1, eat separately.

Mixed storage of meals is more conducive to the reproduction and growth of bacteria and will bring harm to our health.

2. Try not to bring green leafy vegetables.

Although green leafy vegetables are rich in nutrition, if they are kept in an insulated lunch box for too long, they are easy to oxidize, not only ugly in color and appearance, but also produce some nitrite. Although the nitrite content produced by oxidation of green leafy vegetables is not high, it is better to eat as little as possible for health. The nutrients in green leafy vegetables can be supplemented by fruits.

These dishes must be fried thoroughly.

This can not only avoid harmful elements left by immaturity, but also kill bacteria in food at high temperature and prolong the safe storage time. Another thing to note is that you must make lunch with freshly cooked food to avoid chopsticks or saliva polluting the food.

4. Try to bring as little fish as possible

Although fish is a rich source of protein, the fishy smell will be aggravated after long-term storage, which will affect the taste.

The above is the working principle of the insulated lunch box and the precautions for food storage. When you buy, you'd better look for big brands, so that its quality is more guaranteed and it is more conducive to our health. I hope the above content will be helpful to everyone.