Why do vending machines have an air barrier?

Due to the difference in temperature on both sides of the vending machine enclosure structure (or the inside and outside sides of the vending machine), along with the transfer of heat, the movement of wet air flow occurs. This movement of moisture is called water vapor penetration. It is difficult to block the penetration of water vapor. It is even more difficult than blocking the heat flow.　　The temperature difference on both sides of the enclosure structure will cause the partial pressure difference of water vapor, thus forming the power of water vapor penetration. For example, the outer side (high temperature side) of the vending machine is 30°C, the partial pressure of water vapor when the relative humidity is 60% is 19.09mm Hg, and the low temperature side is 0°C, even when the relative humidity is 100%, the partial pressure of water vapor Only 4.58mm pump column. In this way, the partial pressure of water vapor on both sides of the enclosure structure is (19.09mm Hg-4.58mm Hg).　　 14.51mm mercury column, which is a considerable driving force than an ordinary fan with a pressure head of 30-60mm water column-just because of this driving force. The water vapor can be forced through the cracks of the tiny pores of the enclosure structure into the vending machine. For low-temperature vending machines, this means that the moisture pressure enters the enclosure structure and the insulation layer. It has extremely adverse effects on the heat preservation of the vending machine body.　　 is especially important for modified atmosphere vending machines, because in addition to water vapor entering the enclosure structure is not conducive to heat preservation, it will also cause changes in the gas in the vending machine, which is not conducive to the storage of fruits and vegetables. Driven by the water vapor partial pressure difference, the water vapor outside the vending machine will penetrate into the vending machine. When water vapor penetrates into the air barrier of the enclosure structure, when the cold air reaches the dew point or freezing point temperature (especially in low-temperature vending machines), the water vapor will condense in the voids and gaps of the insulation material. Water droplets or ice crystals make the insulation material damp and reduce the insulation performance.　　Because the thermal conductivity of ice is 2.0W/(M?K), it is about 100 times larger than the thermal conductivity of polyurethane of 0.02W/(M?K). In severe cases, it will damage the thermal insulation layer. Therefore, in order to ensure that the thermal insulation material maintains good thermal insulation performance, prolongs the service life, and maintains the normal use of the vending machine, it is very important to provide a moisture-proof and gas-barrier layer on the surface of the thermal insulation layer. haloo vending machine-China's large-scale unmanned vending machine manufacturer, providing a cost-effective, full range of vending machines, to meet customers' personalized customization needs, and to create new vending machine products. The adult products vending machine is now on sale for 9999 yuan, welcome to buy! Inquiry phone: 4008-033-488.

In an age when vending machine is increasingly important, the researchers believe manufacturers should pay close attention to their results.

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vending machine continued to evolve to having strong manufacturers develop huge marketers and people came to value their opinions about what to buy.