A thermal insulated lunch box is generally made of double-layered plastic or stainless steel with a vacuum layer or insulation layer that serves as a container for food. It has a lid at the top, is tightly sealed, and the vacuum or insulation layer can delay heat dissipation of the food inside to achieve the purpose of thermal insulation. So, what should we pay attention to when choosing a thermal insulated lunch box?
We just need to put hot water into the thermal insulated lunch box, cover the lid of the lunch box, and keep it for three minutes. After that, we can touch the outside of the thermal insulated lunch box by hand. If the temperature of the outside and bottom is relatively high, it proves that the thermal insulation performance of the lunch box is generally not very good, and the heat dissipation rate is very fast.
If the thermal insulated lunch box has an obvious warm feeling on the appearance, especially the bottom is clearly warmer, it means that the thermal insulation of the lunch box is not good and the vacuum degree inside has been lost.
When filled with water, tighten the outer cover and see if there is any water leakage. Then invert the lunch box and see if there is any water leakage. The better the sealing of the lunch box, the longer the thermal insulation time will be.
While testing the thermal insulation performance by adding hot water, we can also turn the thermal insulated lunch box upside down and observe if there is any water leakage. If there is water leakage, it proves that the sealing of the thermal insulated lunch box is not very good.
Because the thermal insulated lunch box is generally used to hold food that we directly eat, do not buy plastic lunch boxes that have a strong odor, as they may have a negative impact on our health. The vast majority of thermal insulated lunch boxes are made of stainless steel, which is generally food grade, and such thermal insulated lunch boxes are easy to clean.
The above is an introduction of how to choose a thermal insulated lunch box, hoping to be helpful to everyone.
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