Factors in the fabric water pressure test

If you want to know what is the influence factor of fabric hydrostatic test, you need to know what is hydrostatic head tester, and its working principle, so as to better understand the whole test, so as to better analyze its influence factor.


1. What is the AATCC 127 Hydrostatic pressure Tester


hydrostatic head testing machine(also called impermeability test) is one of the important indicators of waterproof and moisture-permeable fabrics. Hydrostatic pressure refers to the resistance encountered when water passes through the fabric. Under standard atmospheric pressure conditions, the fabric is subjected to continuously rising water pressure until water drops leak out from the back of the fabric. At this time, the measured water pressure is the hydrostatic pressure. The greater the hydrostatic pressure that the fabric can withstand, the better the water resistance or leakage resistance.


2. The principle of hydrostatic test of fabric:


Fabric hydrostatic head pressure tester through three test methods: dynamic test, static test and program, the test sample is fixed on the test area specified by the standard. The air pressure control puts the air pressure of 0-5bar into a built-in water tank filled with distilled water. A test head is connected to the water tank. After the test starts, the test pressure starts to be automatically controlled.


3. The influencing factors in the fabric water pressure test:


(1) the size of the aperture of the coating film. The larger the pore diameter of the membrane, the worse the hydrostatic pressure resistance of the coated fabric.


(2) The size of contact Angle 0. When 0 > 90. , the fabric is water-repellent, and the water pressure resistance of the fabric increases with the increase of 0.


(3) tightness of fabric yarn. The gap between yarns will directly affect the water pressure resistance. The closer the general fabric structure, the better its water seepage resistance.


(4) thickness of fabric. The thicker the fabric, the greater the wet resistance, the greater the water pressure value.


(5) The thickness of yarn. For tight fabrics with good moisture absorption, yarn radius is reduced due to capillary effect. It can improve the impermeability of fabric.


(6) Coating thickness. The coating is too thin, the coating agent is not easy to continuously film on the surface, and the water pressure resistance of the coating fabric is reduced; The coating is thick and the water pressure resistance of the fabric is improved.


(7) the performance of warp and weft yarns. Under the action of water pressure, warp and weft yarns with good elasticity are easy to stretch, which leads to the formation of gaps between adjacent warp and weft yarns, and water droplets are easy to penetrate through, which reduces the water pressure resistance of the fabric.


(8) Coating quality. The whole cloth is required to be uniform and has a certain fastness. The better the coating quality, the better the seepage resistance.


(9) elasticity of fabric. Elastic fabric, water resistance also has a certain impact


(10) The location of the sample and the flatness of the sample also affect the data in the test process.


The above content is collected and edited by Gester.Gester Instruments is professionally engaged in production and R&D of physical properties testing equipment. With more than 20 years experience in research and development,we specialize in providing the solutions of Textiles & Garments Testing Equipment.Welcome inquiry to us.

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