Having decided to correct the bite, after installing the braces, I ran into an unexpected problem. After all, dentists warn that in such cases it is necessary to thoroughly brush your teeth after each meal.

If you are at home, then, of course, this condition is not at all difficult to fulfill. But in recent times I travel quite a lot and brushing my teeth on the road is difficult.

Perhaps the only food that does not require cleaning your teeth is drinking yogurt. After it, you just need to rinse your mouth. It is quite possible to take a couple of bottles of this drink with you on the road. But in the summer, in the heat in a backpack, it will deteriorate in a few hours.

Of course, I have a thermos and more than one, for example, a rather compact, modern stainless steel. But, firstly, having a volume of 1 liter, it itself weighs 700-800 grams, and on the road excess weight absolutely useless.

And, secondly, the tall thermos did not fit into the photo backpack, and it was not very convenient to drink from the one that was wider. And pouring a drink from a bottle into a thermos is unnecessary trouble.

And then I decided to make a camping thermos myself. To do this, I needed cuts of polyurethane foam with a thickness of 10 mm and polystyrene (photo 1), as well as three rolls of various adhesive tape: container, mirror aluminized and reinforced with reinforcement (photo 2).

You can cut polyurethane foam (PPU) with both scissors (photo 3) and a model knife (photo 4). First, I cut out the side wall of the thermos flask so that it could hold three bottles of yogurt (photos 5 and 6).

Then he pasted over the inner side of the workpiece with mirror tape (photos 7 and 8).

Then he fastened the outside with PVC tape (photo 9) and wrapped it with reinforced tape for strength (photos 10 and 11).

From polyurethane foam, I cut out the bottom (photo 12), the inner side of which was also covered with mirror tape (photo 13) and glued it into the body using reinforced tape (photo 14).

Then I cut out the lid of the thermos from the foam in such a way that it was inserted into the body with some effort, and also pasted over it with mirror tape from the inside, and reinforced on the outside (photo 15). In order to exclude the penetration of heat along the junction of the lid with the walls of the thermos (after all, the walls of the thermos are not rigid and therefore do not adhere too tightly to the lid), I cut out adhesive tape from the adhesive tape to fix the lid (photo 16).

So, it remains to place the bottles in a homemade thermos and close the lid.

In such a "thermos" ice is kept in a room at 20 ° C for twelve hours! After all, polyurethane foam conducts heat very poorly, and the mirror tape inside creates an additional reflection of infrared rays.

Such a thermos is not only reliable and conveniently placed in a photo backpack, but also very light - it weighs only 95 grams (photo 17).

Of course, the dimensions of such a thermos can be completely different. For myself, I made a mini-version, but someone may need a bigger thermos. Chilled beer (or something stronger) at a picnic will be in great demand, or you can make a large container for transporting kebabs.

Homemade thermos with your own hands - photo:

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A thermos is an indispensable item in a number of situations. For example, in those when you need to keep the liquid not only hot, but also cold. Few people think about it, but even porridge can be transported in a thermos. For those who lead a healthy lifestyle and monitor their diet, taking various decoctions from natural herbs, it becomes indispensable. Only a small number of people know that you can make a thermos with your own hands at home. Read more about this in this article.

What it is

The question may seem strange, because each of us has seen a thermos. However, in order to start the process of making a thermos, you need to know how it works. The thermos is based on the principle of Dewar vessels. A smaller container is inserted into a larger container, after which a vacuum is formed between them. As you know, heat is transferred by molecules when they collide in space or environment. If there are no molecules, then there is no heat transfer.

Obviously, the absence of molecules is a vacuum. It is he who is the reason for the low thermal conductivity. And also heat is transferred using infrared radiation. The inner surface of the thermos reflects heat precisely because it “does not receive” infrared rays.

Of course, there is no need to talk about the formation of a vacuum in a home-made thermos, but it is quite possible to create conditions under which the thermal conductivity of the vessel will be low.

Necessary materials

In this article, we will look at two ways to make a thermos at home. The materials that will be needed to make a thermos in the first way, everyone can easily find at home.

1. Bottle. The easiest way to make a thermos is from a glass bottle. You can, of course, use a plastic container, but not recommended. The main criterion in choosing a bottle is its volume. It should be noted that it is quite difficult to find a glass bottle with a tight-fitting lid, which is very important for a future thermos.
2. Several paper towels or unnecessary newspapers.
3. To reduce thermal conductivity - black duct tape(you can replace it with scotch tape).
4. Plain food baking foil.
5. Regular scissors.

For the second - more complex - method, you will need the following materials.

1. Two plastic bottles of 0.5 and 1 liter.
2. Plain food foil.
3. Polyurethane foam.
4. Scotch.

It should be noted separately a number of well-known insulation materials that can be used in the process of making a thermos: foam crumbs, toilet paper, sawdust and even wool in any form. Most of these materials do not tolerate water contact. Therefore, when using them in the manufacture of a thermos, it is necessary to carefully pour the liquid into the vessel.

Do not pour liquid into a plastic bottle, the temperature of which is more than 80 degrees Celsius. At high temperatures, plastic begins not only to melt, but also to release harmful substances into the liquid.

How to do it?

Below will be given step by step instructions of how you can make a thermos for tea at home and more.

Method 1

1. You need to take one sheet of newspaper and wrap the bottle completely with it. The bottom can also be wrapped. It is necessary to make three such layers, and more can be done if you want to make the thermos a more efficient device. Newspaper sheets can be replaced with paper towels.
2. Secure it all with a layer of tape or black electrical tape.
3. The bottle is wrapped with a layer of foil.
4. Secure this layer again with tape / duct tape.
5. Wrap the vessel again with a layer of electrical tape. It is best to start doing this in a spiral, securing the tape almost at the very neck, and then go down to the bottom.
6. Homemade thermos can be considered ready. The only thing left to do is to test its effectiveness. To do this, pour boiling water into the container and close it with a lid.

After half an hour, you need to check the temperature of the liquid, focusing on your feelings or measuring it with a thermometer. If the liquid remains hot, then the thermos can be used.

Method 2

1. First you need to take a small bottle and wrap it in foil. The shiny side of the foil should be inside the bottle. It is necessary to apply 5 to 10 layers of foil. The bottom of the bottle should also be wrapped in foil. The same goes for the lid.
2. Take a large bottle and cut off the top.
3. A small bottle is inserted into a large one.
4. Now both containers need to be fixed to each other with tape. It is especially worth paying attention to the places where the polyurethane foam can later spill out.
5. A small hole is made at the bottom of a large bottle. This must be done carefully, without damaging the small bottle.
6. We "pour" polyurethane foam into the free space between the bottles. The work requires special care - make sure that the foam does not pour out.
7. Remove excess foam with a rag and leave the thermos to dry.
8. Homemade thermos can be considered ready.

In the second method, instead of a small plastic bottle, you can use a glass container - either a bottle or a jar. She will keep warm better than the first.

Important! Too much polyurethane foam cannot be used if the small bottle is made of glass, as polyurethane foam when solidified, it has the ability to expand. As a result, the inner glass bulb can simply burst.

Thermos cork

As mentioned above, it is necessary to take only the bottle that has a tight-fitting lid. However, if it is lost or because of it the liquid cools down quickly, then the thermal insulation plug can be made independently.

The easiest way to make it is from foam. To do this, use a penknife to cut out a cork analogue that fits the neck opening with a penknife. After that, the cork is wrapped in foil. In the middle of the plug, you need to make a hole with a needle. Such a cork will be pushed out of the bottle by hot air when pressed (for plastic containers).

It is rather difficult and expensive to buy a good thermos. The offered industrial versions of thermos are not always convenient, therefore sometimes you have to improvise, making a thermos with your own hands. Moreover, the alternative industrial product is, and making a good thermos with your own hands is quite simple.

How to choose a thermos:

Walking around the bazaar in search of a thermos, you should pay attention to the integrity of the case and the quality of the material from which the cork is made. Rubber and plastic in the thermos lid play a significant role, they must be non-toxic and safe for the human body. A thermos, like any container for water, must be hermetically closed, and according to the principle of operation, the thermos is designed in the same way as the Dewar vessel - complete thermal insulation. You can find out a high-quality thermos or not only by typing boiling water there (well, or cold water). Pour boiling water, twist the cork, wait a couple of minutes and touch the thermos with your hand, if it is warm - feel free to throw it away, as this means that the thermos is junk! The best version of a thermos is one that is made of vacuumized glass. But it is also extremely difficult to get it in our time at a reasonable price.

How to make a thermos yourself:

The principle of a thermos is thermal insulation. Everything is very simple, there must be a vacuum inside the thermos body (no molecules - no heat transfer), but it is not always realistic to achieve a vacuum at home. Therefore, the heat must be isolated by other methods.

The most affordable material is polystyrene, it is everywhere in bulk, and you can simply buy it at the nearest hardware store. I did it like this:

I had a piece of expanded polystyrene, and a Chinese, iron thermos - it worked at first, but then something went wrong ... And since it is dear to me as a memory, or rather to buy a new toad pressed down, I decided to insulate it. I took polystyrene foam (they insulate them at home), although extruded polystyrene is also suitable, and began to cut rings out of it, according to the size of the thermos body.

Styrofoam rings

Monotonously, carefully, using a sharp kitchen knife, cut the rings and string them onto your thermos.

We string polystyrene on a thermos

You can also use glass containers (containers from juice or mineral water with an iron cover).

Later I tried to do this with a glass bottle of mineral water, and everything works quite well. The thicker the foam layer, the better the thermal insulation.

There is one more subtlety, so that the expanded polystyrene does not crumble, and for more or less strength of the structure, I recommend stuffing all this into a cut plastic bottle.

We ram the polystyrene foam into a plastic bottle
Ram hard

Here the main thing is to burn it tighter there, the denser the thermal insulation, the better for keeping warm. A plastic bottle, acts as a retaining frame. I also recommend holding the entire structure over a fire, since a plastic bottle has good heat-shrinking properties, it will firmly tighten the expanded polystyrene, just do not allow it to ignite!

I used a gas burner
The bottle fits snugly against the body of the thermos

Well, just like that, the thermos became a thermos again. Although it should be noted that heat loss continued through the cover, it also needs to be insulated as well. a do-it-yourself thermos can be made quite quickly and easily.