GB/T 24218.15-2018Textiles—Test methods for nonwovens—Part 15: Determination of air permeability (English PDF)

Foreword

GB/T 24218 Textiles – Test Methods for Nonwovens can be divided into the following

parts.

--- Part 1. Determination of Mass per Unit Area;

--- Part 2. Determination of Thickness;

--- Part 3. Determination of Tensile Strength and Elongation (Strip Method);

--- Part 5. Determination of Resistance to Mechanical Penetration (Ball Burst

Method);

--- Part 6. Absorption;

--- Part 8. Determination of Liquid Strike-Through Time (Simulated Urine);

--- Part 10. Lint and Other Particles Generation in the Dry State;

--- Part 11. Run-off;

--- Part 12. Demand Absorbency;

--- Part 13. Repeated Liquid Strike-through Time;

--- Part 14. Coverstock Wetback;

--- Part 15. Determination of Air Permeability;

--- Part 16. Determination of Resistance to Penetration by Water (Hydrostatic

Pressure);

--- Part 17. Determination of Resistance to Penetration by Water (Spray Impact);

--- Part 18. Determination of Breaking Strength and Elongation (Grab Method);

--- Part 101. Saline Repellency (Mason Jar Method).

This Part belongs to Part 15 of GB/T 24218.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part uses redrafting method to modify and adopt ISO 9073-15.2007 Textiles –

Test Methods for Nonwovens – Part 15. Determination of Air Permeability.

The technical differences and causes between this Part and ISO 9073-15.2007 are as

follows.

Textiles - Test Methods for Nonwovens

- Part 15. Determination of Air Permeability

1 Scope

This Part of GB/T 24218 specifies the test methods for determining the air permeability

of nonwovens.

This Part is applicable to various nonwovens, including treated or untreated laminated

combination nonwovens.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing (GB/T

6529-2008, ISO 139.2005, MOD)

GB/T 19022-2003 Measurement Management Systems - Requirements for

Measurement Processes and Measuring Equipment (ISO 10012.2003, IDT)

3 Terms and Definitions

The following terms and definitions are applicable to this document.

4 Principle

Under the specified pressure difference, measure the flow rate of airflow

cutting die or template (see 5.8) to cut at least 5 pieces of samples with size of

100mm×100mm.

7 Calculation Results

Calculate the air permeability of each specimen according to the Formula (1); the result

shall take the arithmetic mean f all specimens; thereof, the test value and arithmetic

mean of each specimen shall be rounded off to 3 significant figures. Calculate the

coefficient of variation and accurate to 0.1%.

Where.

R – air permeability, in L/(cm2-s);

......