What to do if the insulated lunch box can't be opened

Usually the food we put in the insulated lunch box is hot. At this time, the air in the insulated lunch box will be heated and expanded. When we close the lid and seal the insulated lunch box and leave the insulated lunch box for a period of time, the food and air in the insulated lunch box will cool down because it is in a sealed state. The air pressure in the insulated lunch box is lower than the outside, under the action of atmospheric pressure, the lid cannot be unscrewed.

 

First put the insulated lunch box in the big fresh-keeping box, and then pour boiling water into the big fresh-keeping box, taking care to prevent scalding, soak the insulated lunch box in boiling water for about 5 minutes, then take it out, and dry it with a rag. Wrap the lid of the insulated lunch box with a rag and twist it firmly to open the lid easily. However, the high temperature of boiling water should prevent burns.

 

1. Pull the lid open vigorously.

 

2. It can’t be opened because there is negative pressure in the cup. You can soak the box in hot water. When the water in the box heats up and the volume expands, it is easy to open

 

3. Turn the cup upside down, tap the bottom of the cup a few times, and then twist the lid.