FYI Tester Instrument

  Fabric dimensional stability refers to the shortening or elongation of fabric length during wearing, washing, storage, etc. Among them, shrinkage is one of the most concerning phenomena. The shrinkage of the fabric not only affects the appearance of the fabric, but may also cause a decrease in performance. Only in this way can it be possible to sew clothes that fit well and are not deformed. Definition Shrinkage is a phenomenon in which the length or width of textiles changes after washing, dehydration, drying and other processes in a certain state. The shrinkage of fabric refers to the percentage of fabric shrinkage after washing or soaking in water. The smallest shrinkage rate is for synthetic fibers and blended fabrics, followed by woolen fabrics, linen fabrics, and cotton fabrics in the middle. Silk fabrics have a greater shrinkage, and the largest shrinkage rates are viscose fiber, artificial cotton, and artificial wool fabrics. Fabric shrinkage test process (depends on ISO 5077

  The moisture regain of textile materials when they reach equilibrium under standard atmosphere is called standard moisture regain. The actual moisture regain of each fiber and its products varies with temperature and humidity conditions. In order to compare the moisture absorption capacity of various textile materials, the moisture regain (standard moisture regain) measured after a specified period of time (equilibration) under uniform standard atmospheric conditions is compared. Calculation formula Moisture regain is the difference between the wet weight and dry weight of the sample as a percentage of the dry weight. Suppose the dry weight of the sample is G0 and the wet weight of the sample is G, then the moisture regain W is W=(G-G0) / G0 × 100% Factors affecting moisture regain rate Internal factors The role of hydrophilic groups: In fiber molecules, the number of hydrophilic groups and the strength of hydrophilicity can affect its hygroscopic performance. The more hydrophilic gr

  What is yarn count? Yarn count is a number which indicates the mass per unit length or the length per unit mass of yarn. Classification Generally, there are four representation ways of yarn count: Tex, Denier, Ne and Nm. Tex and denier belongs to the mass per unit length system, and Ne and Nm belong to per unit mass of length system. Calculating methods of yarn count ​ Tex:  The yarn count in the Tex system is the weight in grams of 1000m of yarn. Tex is usually used to express the count of natural material yarn. It is decimal and employs metric units. Ttex=(m/L)*1000 Where, m = The weight of the sample, g L = The length of the sample, m Denier:  The count of yarn in the denier system is the weight in grams of 9000m of yarn. Denier is usually used to express the count of chemical fibers and filament. Td=(m/L)*9000 Where, m = The weight of the sample, g L = The length of the sample, m In the mass per unit length system, the yarn count is the number of “units of weight” per “unit of le

  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