FYI Tester Instrument

  Definition of viscosity Viscosity refers to the resistance a fluid exhibits to flow. When a fluid (gas or liquid) flows and one part flows over another, it encounters resistance, which is the internal friction of the fluid. To make the fluid flow, a tangential force must be added in the direction of fluid flow to resist the resistance. The upper boundary plate moves to the right at a constant speed, causing the liquid below to also move to the right. Since the bottom plate is stationary, the velocity of the liquid gradually decreases from top to bottom, resulting in shear stress inside the liquid. For liquids with low viscosity, the shear stress is small and the internal friction of the liquid is small; for liquids with high viscosity, the shear stress is large and the internal friction of the liquid is large. Therefore, viscosity is defined as the ratio of shear stress to the gradient of the liquid’s horizontal rightward movement velocity in the y-axis direction. In this example, if

  The Martindale abrasion tester (Martindale method) is used to test the abrasion resistance and apparent pilling properties of woven fabrics, knitted fabrics, non-woven fabrics, decorative materials, coated fabrics, etc. Working principle The fabric to be tested is mounted in the upper specimen fixture and rubbed against the abrasive material mounted on the grinding table. The friction trajectory is a Lissajous figure (an important feature of the Martindale method). After the specified friction stage according to the test requirements, remove the fabric and calculate the wear resistance index or use visual description to evaluate the fuzzing and pilling levels of the sample. Get more information about martindale abrasion tester Operation method 1. Sample preparation In a standard environment, lay it flat and without stretching for a period of time according to different standards. Such as 24h (GB/T 4802.2-1997), 16h (EN ISO 12947-4:1998) 2. Selection of specimens Cut a sample from dif

  Spinning, as an engineering technology, processes fiber aggregates, and its essence is the process of changing fibers from a chaotic state into an orderly arrangement in the longitudinal direction. Currently, the commonly used spinning raw materials are mainly natural fibers and chemical fibers. Natural fibers mainly include cotton, wool, silk, hemp and other fibers. The use of natural fibers for spinning has a long history. Although cotton, wool, silk, and linen are all natural fibers, they have their own characteristics. Some fiber properties are very different, and the spinning performance is very different. It is difficult to use a unified processing method to make spun yarn. Below, we select four common natural short fibers: cotton, wool (hair), spun silk (silk), and ramie (hemp) to compare their spinning processes. With the development of textile machinery and the improvement of spinning principles, special spinning systems for cotton spinning, wool spinning, silk spinning and

  During the wearing process, clothes are constantly subjected to friction, causing the fiber ends on the surface of the fabric to be pulled, belted, hooked, and pulled out, and the phenomenon of hairiness forming on the surface of the fabric is called fluffing. As the hairiness is gradually pulled out and stretched out, generally more than 5mm, when subjected to friction, these fiber ends will hook each other and become entangled to form an irregular ball shape, which is called pilling. As the fabric continues to rub during use, the fiber balls gradually become closer, causing the fibers connected to the fabric to be repeatedly bent, fatigued, and even broken in different directions. The fiber balls fall off from the surface of the fabric, but after that, the fiber hairiness at the broken end will remain. During use they continue to be pulled out and form fiber balls again. Generally speaking, wool fibers and chemical fibers are prone to pilling, especially carded wool fabrics or wool

  People have demands for water repellency and water-conducting fabrics. The water conductivity and comfort of the fabric can be seen from the wettability of the fiber surface; the waterproof performance of the fabric can be enhanced by waterproof treatment or coating. Different methods are used to test the water permeability of the fabric. The different parameters obtained are all to characterize the water permeability of the fabric. Water repellency test method Tests on the water repellency of fabrics after waterproofing and breathable finishing can be divided into three categories. Hydrostatic pressure method The first type is the hydrostatic pressure test. The hydrostatic pressure method refers to the water penetration ability of the fabric under a certain water pressure. It is suitable for all types of fabrics, including those fabrics with waterproof finishing. The waterproofness of fabrics is related to the water resistance of fibers, yarns and fabric structures. The measured res