What is the testing principle of the automatic fabric air permeability tester?

The automatic fabric air permeability tester is one of the family of gas permeability testers, which is suitable for the air permeability of various textiles including industrial fabrics, non-woven fabrics and other breathable products such as sponges. And the detection of highly breathable materials such as paper.

Application industry:

Widely used in food, medicine, packaging, plastics, industry, electronics, energy and other industries, suitable for plastic films, composite films, paper-plastic composite packaging, solar back sheets, sheets, composite materials, aluminized films, co-extrusion films, etc. Packaging containers such as films, aluminum foils, sheet materials, and plastic, rubber, paper, glass, metal and other materials such as bottles, bags, cans, boxes, etc.

Instrument Features:

1. The instrument has its own temperature control function, which can simulate the condition of the product in the actual environment through temperature control, and can meet various requirements for material permeability testing within the temperature range.

2. It has a unique fitting function, which can measure the air permeability, air permeability coefficient, solubility coefficient and diffusion coefficient of materials from -273°C to +200°C to meet the air permeability test and evaluation of plastic films under special application conditions such as high and low temperature. .

3. Computer control, automatic test

4. Determination of transmittance, solubility, diffusion and permeability coefficient

5. Two test process judgment modes of proportional and fuzzy

6. It can expand the test of toxic, explosive and other dangerous gases

7. The range can be expanded by software setting

8. Quick calibration of standard film

9. The network transmission interface supports the centralized management of local area network data and the transmission of Internet information.

Use environment:

1. The instrument should be placed on a flat and stable platform (or foundation).

2. There is no strong magnetic field and no vibration source around the instrument.

3. There is no corrosive medium in the indoor atmosphere, no large particle dust, and stable airflow.

4. Environment: Temperature 20±3℃ Humidity RH:≤65%

5. Use the power supply Ac220V±10V, 50Hz, with good grounding. For areas with large fluctuations in the external power supply, it is recommended to use a power regulator (AC220±1% 2kw).

Test principle:

Place the pre-treated sample between the upper and lower test chambers and clamp them. First, the low-pressure chamber (lower chamber) is vacuumed, and then the entire system is evacuated. When the specified vacuum degree is reached, the lower test chamber is closed. Fill the test gas with a certain pressure into the high pressure chamber (upper chamber), and ensure that a constant pressure difference (adjustable) is formed on both sides of the sample, so that the gas will move from the high pressure side to the low pressure side under the action of the pressure difference gradient. Permeation, by monitoring the internal pressure of the low pressure side, various barrier parameters of the tested sample are obtained.