The emergency blanket is widely used in mountaineering, fire fighting and rescue in the world. In fact, it is very simple, generally a piece of aluminum-plastic composite film, its weight is very light, it is about a dozen grams. Then someone asked, how much use can such a light thing be?
Let's take a look at the application scope and principle of the emergency blanket. The emergency blanket is mainly used in cold places. The purpose is to prevent the body temperature from being too low and cause death. Therefore, it is common to use the emergency blanket to cover the body after being rescued after falling into the water in the emergency. When I saw this, someone would ask, just said that it is a layer of composite film, how can it keep warm? Next we look at the principle of warmth.
There are two main ways to keep warm. One way is to add a warm layer. The warm layer is usually a kind of fluffy material. The air that is mixed with fluffy air forms a layer of air that does not flow on the surface of the object. The air itself is a poor conductor of heat, so it can play a certain role in warmth. Generally, down, cotton and so on are used to keep warm. The second way is heat-reflective warmth. The heat radiation is reflected back using a highly reflective material. We all know that white clothes are cooler than black clothes because white reflections are stronger than black and can reflect sunlight back. The emergency blanket is a combination of these two principles. The role of the aluminum film in the aluminum plastic film is to ensure that a layer of air on the surface of the human body is stable and does not flow. Its main function is that aluminum is a highly reflective material, which can reflect the heat radiation emitted by the human body, and its heat reflection efficiency is as high as 90%. the above. This effectively reduces the speed of heat dissipation. Because aluminum is a metal, it is easier to tear and its strength is not high. Therefore, the main purpose of the composite plastic film is to increase the toughness and strength of the emergency blanket.
Usually the first aid blanket is about two meters long and wide, so the size is to completely wrap the body. There are also emergency blankets that are made into envelope sleeping bags. It is enough to put people directly in the key time. The folded emergency blanket is only half the size of the palm and only a few millimeters thick. There is nothing wrong with loading such a thing in the bag. The price of imports is about one hundred yuan, and the domestic ones are more than ten yuan. This kind of thing is actually very simple, there is no technical content and process requirements. To put it simply, there is a large piece of candy paper. Therefore, domestic production is enough.
What kind of use does the emergency blanket have when it is used outdoors? The purpose of climbing the snowy mountains is not to mention here, it must be something that is always standing and carried. In general, there should be one person in general. When going out in winter, once the temperature of the sleeping bag is not enough, you can put the emergency blanket in the tent. Another way is to use the emergency blanket to be included outside the sleeping bag, which will make you sleep well. In the summer, if you accidentally fall into the water, or if you are exposed to heavy rain and the whole body is soaked, the advantage of the first aid blanket is that even if it is completely soaked in the water, as long as it is used, it will shake off the water drops, and it will not affect the warmth effect. When it rains, you can also use it to build temporary tents or temporary ponchos. And whether it's winter or summer, when there is no equipment and you need to spend the night in the mountains, the emergency blanket is your sleeping bag. Can provide more protection for life.