How to open a thermos that is tightly twisted

Thermoses are gaining great popularity today, becoming an indispensable attribute in almost every family.

But it happens that the lid of the thermos is tightly screwed on and it becomes almost impossible to open it. We will look at what needs to be done to solve this problem in the article.

Causes

The reason that a thermos (thermal mug) has a tightly screwed lid is a decrease in pressure inside it. Due to this difference, it becomes very difficult to open it. To solve the problem, you need to press the valve in the lid to equalize the pressure and calmly open it.

At the moment when hot liquid is poured into the thermos, the metal thread expands and fits tightly to the base, creating a vacuum. As a result, the lid fits tightly to the thermos, and it becomes very difficult to open it.

How to open a thermos that is tightly twisted

In order to open a tightly closed thermos with hot contents, you must wait until the liquid has cooled. However, there are methods that can speed up this process and help you open a tightly screwed cap faster.

Opening methods

Safe and effective methods for opening the lid are to cool or heat it. Using a bottle opener or knife can also help solve this problem, but may damage the thermos.

Method one (under cold water)

This method is suitable for thermoses with external threads. The essence of the method is to place a thermos under cold water to cool. This way the metal thread will begin to narrow, fitting less tightly to the flask, and it will become much easier to unscrew the lid.

Method two (under hot water)

Thermoses with a cap with an internal thread must be placed under hot water. When heated, it will expand and fit less tightly into the main part of the thermos.

We use physical force

Using physical force, you can also open a tightly screwed cap. The best way to do this is to pull the lid up.

We use a bottle opener

If the cork is flat, you can try to pry it off with a bottle opener. This will break the vacuum that has formed inside the thermos and will make it easy to unscrew.

Important! This method should be used very carefully so as not to damage the integrity of the dishes.

Special devices

You can also make your own special device for opening threaded lids. To do this you will need the following materials:

• rubber;
• fine-grain sandpaper;
• long bolt with nut;
• two wooden planks 20-25 centimeters long.

First, you need to make through holes in the planks of such a diameter that you can easily place a bolt in it.

Next, glue strips of sandpaper onto the planks and thread the bolt into the holes, securing it with a nut. In this case, the sanding strips should remain inside the device, and the free edges of the strips should be connected to each other with an elastic band.

Using this device is quite simple: you need to adjust the size of the opener to the diameter of the lid using a nut. Place the structure on it and carefully turn it. Sandpaper provides a tight adhesion to the metal cover, which greatly facilitates the unscrewing process.

other methods

There are several additional ways to open a thermos:

1. Wrap the lid with electrical tape and pull it firmly in the direction of the thread;
2. Use leather gloves when opening (the code fits tightly to the metal without causing slipping);
3. Knock on the lid and walls;
4. Try to pry it with a knife, this will break the vacuum inside, and it will be easier to open the thermos.

Conclusion

There are many different ways to open a tightly screwed thermos lid. All of them are based on the properties of the metal (constriction during cooling and expansion when temperature rises), as well as vacuum breaking. When choosing any of the possible methods, you should act carefully so as not to damage the thermos.