纱线的粗细换算方法（Yarn thickness conversion method）.docVIP

纱线的粗细换算方法（Yarn thickness conversion method） Yarn thickness and method of presentation First, the definition of yarn thickness The thickness of yarn is the most important index of yarn. Because the thickness of yarn is difficult to be directly measured by tools, the degree of yarn fineness is expressed by two indirect indexes, that is, fixed length system and fixed weight system. 1, the definition of fixed length system The weight of the unit length of the yarn at the determined moisture regain. Fixed length system is divided into the Turks (Tex) system and Daniel (Denier) system of two. (1) Tex System: 1000 meters long yarn, in the determination of moisture regain weight (grams), known as the number of yarn (number is also vulgar name), expressed in Nt 1000 x Gk Nt= -- -- L For example: there is a pure cotton yarn, weighing 1000 meters to 18.2 grams, assuming that the public moisture regain is just 8.5%, then the yarn called 18.2tex (or commonly known as No. 18.2). (2) denier Neal system: 9000 meters long filament in the determination of moisture regain weight (grams), known as the number of denier filaments (denier also commonly known as D number), expressed in ND 9000 x Gk ND= -- -- L For example: there is a filament, weighing 9000 meters to 150 grams, assuming no consideration of the public moisture regain factor, the yarn is called 150D. 2, the definition of fixed weight system To set the yarn unit weight regain the public in length to that in constant weight system, there are two kinds of English count and metric number, there are often used in English count (Textbook of metric number is not introduced). Definition of the British count: how many 840 yards of a pound of yarn are determined at the firm regain rate, expressed in Ne L Ne= - - Ge * 840 For example, there is a pure cotton yarn weighing 1 pounds, measuring its length of 32 840 yards, and assuming that the firm moisture regain is just 8.5%, then the yarn is called 32 yarn. 3, the conversion of special