2022.11.21
1. Test method for water vapor permeability of foam plastic machinery
The main reference target for the water vapor transmission rate test of foam plastic machinery: BSEN-2001 “Insulation products for construction equipment and industrial equipment, prefabricated insulation pipes-determination of water vapor transmission rate.” The temperature of the environmental control laboratory required in this specification Under (23 ± 1) ℃, relative to the stable temperature and humidity conditions of (50 ± 3)% humidity. The air flow in the cavity is 0.02m/s~0.3m/s. The height of the sample is (100±1) mm, and the outer diameter is greater than 100 mm. If the sample is then blocked in accordance with 150 mm. Stick to as smooth a cross-section as possible. Place the sample in a dehumidified volume (supplied with 0% humidity), top and bottom sealed with aluminum foil. In this way, when the humidity difference between the humidity inside the sample chamber and the experimental humidity of 50% is 0%, the saturated steam inside the sample chamber is tested. After a period of time, the sample cup is weighed and the water vapor transmission rate can be calculated.
2. Water immersion function test of foam plastic machinery
The completion of thermal insulation of foam plastic mechanical insulation materials relies on many small bubbles inside. The diameter of the bubble is within a reasonable range, the thicker the bubble, the higher the gas content, the better the insulation effect. In practice, whether it is the difference in temperature and humidity between the inner and outer walls of the foam plastic machine, this forms the partial pressure of water vapor, and the water vapor will gradually penetrate into the information. Since the thermal conductivity of water (0.599 W/m·K, 20°C) is higher than that of air (0.026 W/m·K, 20°C), it will be added gradually according to the thermal conductivity of the water vapor inside, and then Information lead drops or loses heat, shortening request cycles. Therefore, the anti-foam material mechanical vapor can penetrate very important information, which is directly related to the life of the application. Immersion is stronger against water vapor, water vapor molecules are more difficult to deepen the heat conduction of internal data, and the service life of thermal data is longer. For foam molding machinery, anti-humidity can be characterized by water vapor transmission rate through data immersion.
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