Air permeability test method for textile

Air permeability is an important factor in the performance of such textile materials as gas filter, fabrics for air bags, clothing, mosquito netting, parachutes, sails, tentage, and vaccum cleaners. It can also be used to provide an indication of the breathability of weather-resistant and rainproof fabrics. 

 

A circle of fabric is clamped into the tester and through the use of a vaccum, the air pressire is made different on one side of the fabric. Airflow will occur from the side with higher air pressure, through the fabric, to the side with the lower air pressure. From this rate of air flow, the air permability of the fabric is determined. 

 

1. Read and record the individual test results in SI units or in inch-pound units rounded to three significant digits.

2. Ensure that the control vales XAY and XCY on the right are completely closed.

3. Check that the manometer (the glass tube of liquid) indicates zero. Adjust if necessary using the black knob on the top right of the machine to raise and lower the level.

4. Using the foot switch, turn on the vacuum pump (does this have to be held down?)

5. Using the black flowtube switch closer to the center on the left side of the machine, select flow tube number 4.

6. Gradually open XValve CY (on the right side) until the required pressure is shown on the manometer tube.

7. If the flowtube float has not moved close XValve C.Y

8. Select Flowtube number 3.

9. Gradually open XValve CY (on the right side) until the required pressure is shown on the manometer tube.

10. If the flowtube float has not moved close XValve C.Y

11. Select flowtube number 2.

12. Gradually open XValve AY until the required pressure drop is shown on the manometer.

13. If the float in tube 2 does not rise, close XValve A.Y

14. Select flowtube number 1.

15. Gradually open XValve AY until the required pressure drop is shown on the manometer.

16. Once a range has been established for a particular type of material, the correct flowtube can be selected without going through the sequence. 

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