Talking about the condensation problems and solutions of engineering tents

Engineering tents are also called cotton tents, civilian tents and engineering tents. They belong to a type of tents and are mainly used for construction on site. The engineering tent is produced by a combination of adhesive bonding and high-frequency heat sealing. The air column is made of PVC double-sided coated cloth, and the tarpaulin is made of waterproof and anti-ultraviolet materials. It has the advantages of fast forming, high strength, flame resistance, mildew resistance, UV resistance and moisture resistance. Engineering tents are sometimes inflatable tents, and the tent frame is an air column structure. Compared with ordinary metal bracket tents, it has the characteristics of light weight, small size after folding, and easy portability. The engineering tent adopts the principle of structural mechanics to design the frame, and uses the gas pressure characteristics to expand the airbag to form a rigid column, which is organically combined to support the tent's skeleton. With the strength of the skeleton material used, the bearing capacity of the tent can be set; the performance of the polymer coating determines the service life of the frame and the maintenance of the rigidity of the frame; and the rationality of the air chamber setting, then Determines the support of this frame. As the saying goes, there is no engineering tent that does not condense. The principle of condensation, the temperature in the tent is high, the temperature of the tent wall is low, and the water vapor in the tent condenses on the tent wall. The human body absorbs 200-500ml of water by the respiratory system and perspiration at night. (More degree) If there is a lot of perspiration, if the temperature is very low, the temperature in the insulation layer of the sleeping bag drops below the dew point, and the water will accumulate in the insulation layer of the sleeping bag. This is one of the things to consider when camping for long winters. To put it simply, in a cold environment, whether the project tent is single-layer or has an inner and outer tent, if the ventilation cover is not well designed, this problem cannot be avoided. Why? First understand where the water comes from. For sleep, one is the water vapor evaporated from the body, and the other is the water vapor exhaled from the mouth. The words qi and vapor are very different. The water vapor can be permeated by the coated fabric with breathable function, and the exhalation from the mouth starts with water vapor. Since the exhalation volume is relatively large, it becomes water vapor when the mouth is cold. The white flower is already tiny water droplets. , is larger than the pores of the breathable coating fabric, and rarely penetrates out. The fabrics with more than 100 pieces of one-meter microporous membranes like Goretex will appear inside the environment where the temperature difference between inside and outside is large.“It mists”The problem, not to mention the airtight PU fabric tent? If the function of the breathable cover is low, and the speed of water vapor drying is lower than the speed of exhalation, it will definitely condense on the inner layer of the fabric, and the fog and frost on the window are the same. Due to cost issues, tent fabrics are made of cheap PU coating, which is not breathable at all. Like plastic cloth, it will condense. The price of tent PU coating fabric is 4 to 8 yuan per meter, and the cheap and breathable PU coated fabric for clothing, the so-called low permeability (below 3000 breathable) price is 12 to 18 yuan per meter, engineering tent materials As little as ten meters, as many as tens of meters, the cost of using breathable materials is amazing! Ferrino's MonsterLite alpine tents use breathable fabrics for more than a few thousand dollars. So how to avoid the condensation problem of engineering tents? In fact, there are many methods: 1. Keep ventilation. This depends on the design of the project tent, and each has its own merits, especially the single-layer bottom (the floor and the tent are sewn together), and the top should be well ventilated, otherwise the condensation water will flow down; 2. The big tent can have a fire inside, but the structure design that does not make a fire, but the problem needs to be kept in place; 3. In the environment where there will be no exhaled water vapor, choose a tent with breathable fabrics (choose when there is no weight requirement). Cotton tents are breathable and moisture-permeable), and choose good water repellency to prevent the surface cloth from being wetted and reduce the air permeability. This method will bring about an increase in cost; For double-layer tents with tents, condensed water will flow down the outer tent. Here we should pay attention to the ventilation capacity of the inner tent. If the ventilation is not good, it is very dangerous, so only the condensed water is fine. In a cold environment, if the condensed water is inside The constant frost on the account will cause an airtight closed inner account, which will bring hidden dangers.

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