What can you do if the bucket of keep warm lunch box can’t be opened?

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Principle of keep warm lunch box

Generally, it is a food container made of double-layer plastic or stainless steel plus vacuum layer or thermal insulation layer. It has a cover on the top and is tightly sealed. The vacuum layer or thermal insulation layer can delay the heat dissipation of the food installed inside, so as to achieve the purpose of heat preservation. The thermos lunch box is developed from thermos bottle. The principle of thermos is the same as thermos bottle. There are three ways of heat transfer: radiation, convection and transfer. The silver liner in the heat preservation barrel can reflect the heat radiation, and the vacuum layer or heat insulation layer of the cup body can block the heat transfer.
With the application of high-tech vacuum technology, the double-layer high-quality 304 stainless steel internal vacuum treatment can effectively block the heat source and achieve the effect of heat preservation. The design is more user-friendly, usually designed into three or four layers. The lunch boxes and soup boxes with higher temperature need to be placed under the heat preservation barrel, and then the heat insulation board is covered in the middle, and then the vegetable boxes are placed on the top, which can not only bring you the best heat preservation effect, but also make your food and drink longer and fresher.
What to do if the thermos can’t be opened
Usually, the food we put into the lunch box is hot. At this time, the air in the lunch box will be heated and expanded. When we close the lid and seal it and place the lunch box for a period of time, the food and air in the lunch box will cool down. Because it is in a sealed state, the air pressure in the lunch box is lower than that outside. Under the action of atmospheric pressure, the lid will not open.
First put the lunch box into the big fresh-keeping box, then pour boiling water into the big fresh-keeping box, pay attention to prevent scalding, soak the lunch box in the boiling water for about 5 minutes, take it out, and dry it with a rag. Cover the cover of the lunch box with a rag. It’s easy to open the cover with a twist. However, hot water, to prevent scalding.
How to open the heat preservation box cover
The principle of the insulating cup is the same as that of the insulating barrel. You can refer to the method that the insulating cup cannot be opened:
When you pour hot water into the cup, the air and water in the cup are all surging. But after a while, they are cold and contracted, making a pressure difference between the inside and outside of the cup, so they can’t be unscrewed. The solution is to overcome the pressure difference.
Specific solutions
1. Tighten vigorously.
2. Turn the cup upside down, slap the bottom of the cup a few times, and then screw the lid.
3. Can not open is generally negative pressure in the cup, can put the cup in hot water bubble, wait for the water in the cup to heat up, volume expansion, it is easy to open.
4. Heat the cup cover quickly to make a gap between the cup cover and the cup body.
5. First put it in the refrigerator for quick freezing. After taking it out, pour hot water on the lid (just the lid) to make sure you can open it.
6. Use the key (other sheet metal is OK, insert wider, do not damage the cup cover) to gently pry at the gap between the cup cover and the cup mouth, the air will enter with a sniff, and it is easy to open with a slight twist.
7. Drill a small hole in the cup (or lid) to make it “leak” and achieve the balance of internal and external air pressure. Don’t let the lid of the thermos box close too tightly in the future. (try not to use this as much as possible) tip: the heat preservation cup has metal components. Do not put it in the microwave oven for heating. It will catch fire.


Post time: Feb-28-2020

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