How easy it is to overpressure a plastic bottle

How to create excess pressure in plastic bottle A very simple way to create a small excess air pressure in a plastic bottle, without the use of complex devices (pumps, compressors, etc.).
Greetings to all homemade colleagues, as well as everyone who is interested in homemade products and various interesting ideas!
Today, I just want to share a very simple idea of ​​how you can, in a very simple way, without resorting to the use of special devices (pumps, compressors, etc.), slightly, but tangibly, “inflate” a plastic bottle, that is, create her slight overpressure. This may be necessary in order to make some homemade products from similar plastic bottles, for example, home furniture or swimming equipment.
In general, I must say that this idea came to me three years ago. Then it turned out that one of my acquaintances turned to me for advice on whether it was possible, in some simple and affordable way, without having any special equipment at hand, to pump up empty plastic bottles with air. was, by no means idle, because, as she explained, she had accumulated a lot of empty plastic bottles with a capacity of 1.5-2 liters, and she wanted to try to make some home furniture out of them.
It should be noted here that nowadays plastic bottles are a very popular material for making various homemade products. Moreover, they make such homemade products, both from individual parts of plastic bottles (for example, cut them into strips, or into various fragments), and from whole bottles.
Empty plastic bottles of various capacities generally have a very wide range of applications. So, for example, they are very often used for various purposes in gardening and horticulture, as well as in personal and dacha farming.
In addition, empty plastic bottles are successfully used in the manufacture of various homemade furniture. Moreover, they make from them not only small furniture such as poufs, stools, etc., but also whole armchairs, beds and even sofas. Also, a variety of floating aids are made from empty plastic bottles, for example, rafts, boats, catamarans, etc.
So, my friend decided to try her hand at making homemade home furniture from empty plastic bottles. However, in doing so, she faced a serious problem. The fact is that empty plastic bottles, even with hermetically sealed lids, have a fairly low air pressure inside. Because of this, they are easily deformed and punctured, because, in technical terms, they have very little rigidity and stability.
Naturally, such bottles are not very suitable for making furniture. As a result, my friend was puzzled by how you can pump these bottles with air, that is, create some excess pressure in them. At the same time, the matter was complicated by the fact that she did not have any special equipment at hand. As a result, without coming up with anything, she turned to me for advice on this matter. And so I just came up with an interesting idea in this regard. To confirm, I did a very simple experiment and it worked out for me. After that, I shared this idea with my friend. And as a result, it helped her a lot. I don’t know if she succeeded in making any furniture, but later she thanked me very much for this idea.
Moreover, over the past years, I have shared this idea with different people several times. And the last time, it was just the other day. About two weeks ago, we had a strong heat, and we often went to swim in the river, in the village where my father lives. Every day, many people swam there, including many children and adolescents. And then one day, I witnessed how several teenagers, ten or twelve years old, tried to make something like a raft out of plastic bottles.
Unfortunately, at that time I had neither a camera nor a phone with me to photograph their product. But, in general, they took some kind of wooden shield, and around the perimeter they tied to it several dozen plastic bottles, with a capacity of five and two liters. And they really did end up with a kind of raft that at least could hold up to two of these guys.
However, it seemed to me that this raft still did not have good buoyancy for exactly the same reason that I indicated above. That is, the empty plastic bottles from which it was made were very soft and did not have excessive pressure. So I shared my idea with these guys, I really don't know if they used it.
Nevertheless, now I want to share this idea with the readers. Perhaps one of them will find it useful too. Moreover, this idea is extremely simple.
This idea is based on a well-known physical phenomenon – thermal expansion of gases and vapors of liquids. Its essence lies in the fact that if we cool an open plastic bottle (together with the air in it) at a low temperature, for example, in the freezer of the refrigerator, and then, after sealing it with a lid, take it out and heat it at room temperature, then in it excessive air pressure will be created. Moreover, this pressure will be the greater, the greater the difference between the temperature at which we cooled the bottle and the temperature at which we will operate it.
This happens due to the fact that at low temperatures, the pressure of air and water vapor in a plastic bottle decreases and, as a result, the volume of this air decreases. As a result, a vacuum is created in the bottle and an additional portion of air enters it. But when we then hermetically close this bottle and heat it, the pressure in it rises again, and since the amount of air in it is already greater than it was before at a given temperature, the pressure will be higher.
Of course, it must be said right away that such an overpressure will be very small, and it will also fluctuate depending on temperature changes in the place (indoors or, especially, outdoors) where such a bottle will be used. However, even this pressure will be quite enough for this bottle to significantly increase its rigidity and stability. And if you make a lot of such bottles, then it is quite possible to make both furniture and swimming equipment from them.
Well, now I will show with an example how this can be done.
For this I need the following accessories:
• An empty plastic bottle with a capacity of two liters with a lid.
• Freezer of the refrigerator.
Step 1. Take a plastic bottle, unscrew it from cover it and put it in the freezer of the refrigerator. The lid can be put there so that it is at hand.
How easy it is to create excess pressure in a plastic bottle Step 2. Keep the plastic bottle in the freezer for 10-15 minutes. The air inside the bottle needs to be properly cooled, and its temperature becomes the same as the air temperature in the freezer.
By the way, the lower the temperature in the freezer, the better. For example, my freezer temperature is -23 ° C.
How to create excess pressure in plastic bottle But in principle, a temperature of -18-20 ° C will be enough.
Step 3. We open the freezer and as quickly as possible, tightly and tightly screw the cap onto our plastic bottle. This must be done very quickly, preferably right in the freezer, so that the bottle does not have time to heat up at all.
How easy it is to create excess pressure in a plastic bottle Step 4. We leave our plastic bottle for a few minutes in the room where we are going to use it or outside (provided it is summer outside) so that it warms up.
How to create excess pressure in plastic bottle In just a few seconds, the air pressure in this bottle begins to rise. And in a few minutes, when the air temperature inside the bottle becomes the same as outside, the air pressure in it will reach a maximum.
And this bottle will inflate quite strongly.
 How easy it is to create excess pressure in a plastic bottle If you knock on any object, it will literally ring.
How to create excess pressure in plastic bottle Also the bottle will jingle if you tap it with your finger.
How easy it is to create excess pressure in a plastic bottle The fact that the pressure in this bottle is quite decent is evidenced by the fact that it practically does not deform under an external load.
For example, I tried to press hard on it with my hand, however, the bottle almost did not deform at all.
How easy it is to create excess pressure in a plastic bottle I also tried with all my strength to squeeze this bottle with my hand, but this also practically did not deform it.
How easy it is to create excess pressure in a plastic bottle All this suggests that the excess pressure achieved by the method described above is quite enough to significantly increase the rigidity and stability of plastic bottles. This means that such bottles can be used to make furniture or swimming facilities, and possibly for other purposes.
How easy it is to create excess pressure in a plastic bottle How to create excess pressure very easily in a plastic bottle By the way, after that, for clarity, I decided to check the rigidity of the bottle with the lid just closed. And I used the same bottle. To do this, I opened it by unscrewing the lid and let the air out of it. By the way, the air came out with a hiss and hiss.
 How easy it is to create excess pressure in a plastic bottle Well, then I turned the lid back on and tried to squeeze the bottle like this. In this case, the bottle turned out to be much softer and deformed pretty well.
How easy it is to create excess pressure in a plastic bottle How to create excess pressure in plastic bottle In general, as you can see, the bottle is simply closed with a lid, significantly inferior in rigidity and stability, the bottle in which an excess air pressure is created. Therefore, this method of “blowing” plastic bottles can be used to make homemade products.
It should be noted that, perhaps, the main advantage of this method lies in its incredible simplicity. Indeed, a refrigerator with a freezer can be found in every home. Although, in principle, you can do without a freezer at all, if you “inflate” plastic bottles in winter in the cold. To some extent, this is even preferable, since you can wait for a particularly severe frost, for example, thirty degrees and below. In addition, on the street, you can simultaneously cool any large number of bottles.
You can also store inflated bottles or homemade made of them outside, for example, in an unheated room. In winter, however, they will deflate, but in a warm room or in the warm season outside, they will inflate again. You can store them for as long as you like, the main thing is that they are tightly and hermetically sealed.
Well, this is where I finish and wish all homemade people health, as well as good creative ideas for homemade products!


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