How to test the waterproofness of textile fabrics?

 

How to test the waterproof performance of fabrics and fabric waterproof method? Waterproof performance refers to the fabric resistance to water wetting and infiltration performance, fabric waterproof performance of the characterization indicators are mainly water grade, hydrostatic pressure level and water infiltration 3, test methods are mainly spray method and hydrostatic pressure method 2.

 

Hydrostatic pressure method

 

Commonly used standards

 

GB/T4744, ISO811, EN20811, AATCC127, JISL1092, AS2001.2.17, ASTMD751, ISO9073-16 is to the fabric to withstand the hydrostatic pressure to indicate the resistance encountered by the water through the fabric. The test principle is under certain conditions, so that the side of the specimen to withstand a continuous rise in water pressure, record the pressure value when a certain penetration occurs, so as to evaluate the waterproof performance of the fabric. Among them, ISO9073-16 is specifically for the determination of water penetration resistance of non-woven fabrics.

FZ/T01004, ISO1420 and BS3424-26 are applicable to coated fabrics. Under the specified conditions, one side of the sample to be tested is subjected to continuously rising water pressure until the specified water pressure value is reached, and whether penetration occurs or continuous pressure is applied until penetration occurs is observed within the specified time.

 

Spraying method

 

Spraying method is to spray test the specimen under certain conditions, according to its water to determine the level of water, so as to assess the waterproof performance of the fabric.

 

The spray method is to simulate the degree of wetting when the fabric is subjected to rain, applicable to the waterproofing treatment or non-waterproofing fabric, spray method measured water performance and fabric fibers, yarns, structure and surface properties have a certain relationship.

 

Commonly used standards

 

GB/T4745, ISO4920, JISL1092, AATCC22 and BS3424-26 using the spray method of water test to determine the waterproof performance of the fabric, the specimen under certain conditions after the spray test, the appearance of the specimen and the description of the phenomenon of water staining and picture comparison, to determine the level or score of the fabric staining. The determination of water absorption rate.

 

AATCC35, AATCC42 and ISO9073-17 are to put a weighed absorbent paper after the test sample, spray it with water under the specified conditions, and then re-weigh the absorbent paper to evaluate the water permeability of the sample. This method is mainly used to predict the resistance of fabrics to rainwater penetration. Among them, ISO9073-17 is specifically for the determination of water penetration resistance of nonwoven fabrics.

 

GB/T14577 and ISO9865 Bondisgate rainfall method is used to evaluate the water repellency of the fabric under the movement state by the shower shower. Specifically, under the specified artificial rain shower, the fabric resists the ability to absorb rain by the specified time test, expressed by the water repellent grade, and also evaluates the water absorption of the fabric and the amount of water outflow through the fabric.