Today we talk about the “breathability” of outdoor clothing. Please note that this “breathability” is not the other “breathability”. The breathability here is to evaluate the movement of air on both sides of the fabric, which intuitively reflects the tightness of the fabric structure. “Breathability” is mostly an auxiliary indicator. For example, “breathability” is used to indicate “windproofness” in “General Technical Requirements for Knitted Professional Sportswear”; “breathability” is used to assess wearing comfort in “Sports Bra”; The anti-drilling performance of the material is evaluated by testing the rate of airflow through the fabric. The lower the value, the better the performance.
(The “comfortable breathability” we often hear in publicity mostly refers to “moisture permeability”, which measures the movement of water vapor on both sides of the fabric. We will introduce this performance to you in detail in the next issue.)
Common test standards for air permeability
Breathability test
Testing process:
Under the specified pressure difference condition, measure the air flow rate vertically passing through a given area of the sample within a certain period of time, and calculate the air permeability.
Based on the above testing principles, the test is divided into three steps:
First: Set parameters
Select the corresponding test head according to the standard or customer supply requirements and update the parameters in the operation interface.
Second: Select the results
Select standard or customer-supplied test result units: mm/s, L/m2/s, L/dm2/min, ft3/ft2/min, cm3/cm2/s, m3/m2/min, m3/m2/h, dm3/s……
Third: Record data
Test results:
The test results can be roughly divided into two categories: one is to reflect the pressure, area and time simultaneously according to the testing principle, such as cm3/s/cm2, ft3/min/ft2;
The other is to express it in terms of airflow velocity, such as mm/s, m/s.
The conversion relationship between these two units is as follows:
1 cm3/s/cm2=1.9685 ft3/min/ft2=10mm/s=0.01m/s
Conclusion:
Common domestic product standards for testing breathability include:
Although the standard does not clearly require the thickness of the test sample, due to equipment limitations, the test sample should not be too thick to ensure that the sample is flat and not deformed when clamping the sample.
The article comes from: CTI Testing
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