A three-liter jar is much more functional than it might seem at first glance. If only because many useful things can be made from it. For example, you get an excellent homemade thermos that will be able to maintain the desired temperature for at least 24 hours. And most importantly, a useful device is made in less than half an hour.
In order to turn a two- or three-liter jar into a thermos, we need nothing at all. Namely, you will need the jar itself, a five-liter plastic water bottle, a small piece of foil or foil. In addition, you will need other "consumable" little things like glue, tape, scissors, knife, etc. Surely, the listed things can be found in every home. The essence of the further assembly process is to completely wrap the can with foil plastic and fix it. Let's consider how this can be done faster and easier without losing the ergonomics, efficiency and reliability of the design.
So, the jar needs to be wrapped so that it is completely covered by the reflective material. To do this, you will have to take a whole sheet of foil and first "aim", make markings and cut out the desired piece so that there is enough material to cover the bottom. In order for the foil to fit well, it will be necessary to make several cuts at the top and bottom. When the material is stretched, it should be fixed with tape and / or glue, first of all at the "neck" of the can.
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As soon as the foil plastic is fixed, a plastic bottle is pulled over a three-liter jar. Of course, you first have to cut off the upper part of the last one. Next, you need to carry out heat shrinkage. To do this, it is best to find a building hair dryer and take a good walk over the entire surface of the future thermos. At the final stage, it remains only to cut out two circles from the foil and glue them to the lid. Here the thermos is ready. The temperature keeps 24-28 hours.
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A source: https://novate.ru/blogs/190420/54196/