Hydrostatic Pressure Test for Fabric



The hydrostatic pressure resistance index is one of the most important indicators of waterproof and breathable fabrics. Hydrostatic pressure refers to the resistance water encounters as it passes through fabric. Under standard atmospheric pressure conditions, the fabric is subjected to continuously rising water pressure. Until water droplets seep out from the back of the fabric, at this time, the measured water pressure value is the hydrostatic pressure. The more hydrostatic pressure a fabric can withstand, the better its waterproofness or resistance to leakage.

The units expressing hydrostatic pressure are N/m2，kPa and water column height m. The conversion relationship is that the height of the water column of 1m is equal to 9. 82 kPa.Paragraph. 单击此处进行编辑.

Hydrostatic pressure tester

The YG812 digital water permeability tester uses the spray method to measure the permeability of materials. Clamp the sample in the fixture of the test bench, and inject a certain amount of water through the water inlet pipe from above. The water will penetrate through the sample to the bottom of the test bench, and a certain amount of water will flow out of the outlet pipe at the bottom. Based on the amount of water flowing out of the outlet pipe and the penetration area of the sample, the permeability coefficient of the material can be calculated to determine the water permeability performance of the material.
Hydrostatic pressure with range from 0 to 200kPa;Pressure applied on specimen pass through a buffer device to effectively avoid over-pressured; There is a calibration port in control box . If need to calibration the machine ,Firstly open the back cover of contraol box and pull out the plug .
Click to get more information about hydrostatic pressure tester

Factors affecting the water pressure resistance of fabrics

  • Tightness of fabric. The increase in the distance between yarns will directly affect the water pressure resistance. Generally, the tighter the fabric structure, the better its water resistance.
  • The size of the pore size of the coating film. The larger the pore size of the membrane, the worse the hydrostatic pressure resistance of the coated fabric.
  • The size of the contact angle 0. When 0>90, the fabric has water-repellent properties. At this time, as 0 increases, the water pressure resistance value of the fabric also increases accordingly.
  • Coating thickness. If the coating is too thin, the coating agent will not easily form a continuous film on the surface, and the water pressure resistance of the coated fabric will be reduced; if the coating is thick, the water pressure resistance of the fabric will increase.
  • Thickness of fabric. The thicker the fabric, the greater the moisture resistance and the greater the water pressure resistance value.
  • Thickness of yarn. For compact fabrics made of fibers with good hygroscopicity, the yarn radius is reduced due to the existence of capillary effect. It can improve the water resistance of fabrics.
  • The performance of warp and weft yarns. Under the action of water pressure, elastic warp and weft yarns are easy to elongate, resulting in the formation of gaps between adjacent warp and weft yarns, through which water droplets can easily penetrate, reducing the water pressure resistance of the fabric.
  • Coating quality. The entire cloth surface is required to be uniform and have a certain degree of fastness. The better the coating quality, the better the water penetration resistance.

Comments

Post a Comment

Popular posts from this blog

Twist Test Methods and Influencing Factors

Image
  Twist test is an important part of yarn inspection. It is related to the strength, elongation, appearance, style, etc. of yarns and fabrics. Different yarns have different structural characteristics, and their twist testing methods are also different. Basic concept To understand twist testing, you must first understand what twisting is. Twisting is a necessary condition for yarn formation. Short fibers can be made into yarns with certain physical and mechanical properties through twisting; filaments often need to be twisted in order to increase the tightness between single filaments, facilitate processing, and improve fabric properties. Number of twists Twisting is to cause two cross-sections of parallel straight fiber slivers to rotate relative to each other. The number of relative rotations of the two cross-sections is called the number of twists. Twist Twist refers to the number of twists per unit length of yarn . Twist coefficient In actual production, the twist coefficient is of
Read more

Combing Process in Spinning

Image
Before processing cotton, wool, and silk fibers into fabrics, the process of removing impurities and short fibers in the fibers with a combing machine is called combing. The texture, washability and durability of the fabric produced through this process are greatly improved compared with carded fabrics. The following introduces the composition of the combing machine and the combing process. The kinematic coordination relationship of the main parts on the combing machine is indicated by a dial. The disc is mounted on the combing machine and rotates synchronously with the cylinder, which is generally called the indexing disc. The index plate is divided into 40 equal parts along the circumference, and each equal part is 9°, which becomes one index. The working cycle refers to the time interval between the combing cylinder of the intermittent combing machine corresponding to the two actions of combing the whiskers. That is: the first row of needles in the combing cylinder goes to the botto
Read more

Garment Dyeing-Special Dyeing Method In Textile

Image
Garment dyeing is a relatively special dyeing process for textiles and garments. Many people may not know much about this dyeing process. In the impression of most people, textile and clothing products are dyed in the fabric period, and garment dyeing is a dyeing process that breaks people’s cognitive limitations on textile dyeing. ​What is garment dyeing ​Garment dyeing means that dyeing the one not in the fabric type but in the garment type itself. The garment type mentioned above include socks, towels, sportswear, shirts, plush toys (without fillers), T-shirts, pants, bathrobes, handkerchiefs, bath mats, carpets, scarves, etc. The material of these garments can be wool, linen, silk and cotton of natural fibers. But most garments are made of cotton or a cotton-rich blends. Garment dyeing imparts vibrant colors to garments. The clothes such as denim garments, tops, sportswear and casual clothing with garment dyeing can provide a distinctive special effect. Garment dyeing method Garmen
Read more