The principle of moisture permeability test and the significance of test
2023-07-06 21:08:20
  Moisture permeable instrument , alias moisture permeability tester, moisture permeability tester, water vapor transmission rate tester, water vapor permeability tester, water vapor transmission rate test system.
The moisture permeability meter is mainly suitable for plastic film, composite film and other films, sheet materials, high barrier materials, solar back sheets, metal foils, waterproof coils and bottles, bags of plastic, rubber, paper, glass, metal and other materials. Determination of the water vapor transmission rate of packaging containers such as cans and boxes. Through the measurement of the water vapor transmission rate, the technical indicators for controlling and adjusting the packaging materials and the like, and meeting the different needs of the product application are achieved.
Infrared moisture permeability meter
Using the infrared sensor method test principle, the pre-treated sample is clamped between the test chambers, nitrogen with stable relative humidity flows on one side of the film, and dry nitrogen flows on the other side of the film; due to the existence of humidity gradient The water vapor will diffuse from the high-humidity side through the membrane to the low-humidity side; on the low-humidity side, the permeated water vapor is carried by the flowing dry nitrogen gas to the infrared sensor, and when entering the sensor, the same proportion of electrical signals are generated, and the sensor is electrically Analyze and calculate the signal to obtain parameters such as the water vapor transmission rate of the sample. For the packaging container, dry nitrogen flows in the container, and the outside of the container is in a high-humidity state.
Standard: ISO 15106-2, ASTM F1249, TAPPI T557, JIS K7129
2. Electrolysis method:
Using the electrolytic sensor method, on the low-humid side, the permeated water vapor is carried to the sensor by the flowing dry nitrogen.
Standard: GB/T 21529, ISO 15106-3, DIN 53122-2, YBB 00092003
3. Weighing method:
The principle of the moisture-permeable cup weighing method is adopted, and a certain humidity difference is formed on both sides of the sample at a certain temperature, and the water vapor passes through the sample in the moisture-permeable cup to enter the dry side, and the moisture permeability is measured. The amount of change in the weight of the cup with time is used to determine parameters such as the water vapor transmission rate of the sample.
Standards: ISO 2528, GB 1037, GB/T 16928, ASTM E96, ASTM D1653, TAPPI T464, DIN 53122-1, JIS Z0208, YBB 00092003
4, humidity method:
The sample to be tested is sandwiched between the constant temperature dry and wet chambers, and the sensor in the test chamber analyzes the change of the humidity in the cavity, and tracks the time required from the preset lower limit value to the upper limit value, and continuously measures multiple times. And system analysis, the water vapor transmission rate and the moisture permeability coefficient of the sample were obtained.
Standard: ISO 15106-1, ASTM E398, TAPPI T523, JIS K7129
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