Yarn fineness is an indicator used to measure the thickness of yarn. There are two calculation formulas commonly used in textiles: fixed-length calculation formula and fixed-weight calculation formula.
Fixed length calculation formula
1. Tex number – again The “number” refers to the number of grams of the weight of a 1,000-meter-long yarn under a public moisture regain. It is a fixed-length unit. The larger the gram weight, the thicker the yarn. It is often used to represent wool yarn.
2. Denier (D) – also known as “denier” or (denier), refers to the number of grams of weight of 9000 meters of yarn or fiber at a public moisture regain rate , it is also a fixed-length unit. The larger the weight, the thicker the yarn or fiber. It is often used to represent chemical fiber filaments, real silk, etc.
3. Dectex (dtex) – referred to as decitex, the symbol is tex, which refers to the number of decigrams of the weight of a 1000-meter-long yarn at a common moisture regain, dtex=dg/L* 1000, where dg is the weight of the yarn (or silk) (in decigrams), and L is the length of the yarn (or silk) (in meters). It is a fixed-length unit. The larger the weight, the thicker the yarn. It is often used to represent fiber yarn.
Fixed weight calculation formula
1. Imperial count ( Ne) – Under the public moisture regain, the multiple of 840 yards of the length of 1 pound of yarn, that is to say, 1 pound of yarn is exactly 840 yards long, which is 1 yarn, and the length of 1 pound of yarn is 21×840 The yardage length and the fineness of the yarn are 21, written as 21s. The imperial count is a fixed weight system, so the larger the count, the thinner the yarn. The British count is not the legal yarn fineness index in my country today, but it is still widely used in enterprises, especially in the cotton textile industry.
2. Metric count (Nm) – under the public moisture regain, the multiple of meters of the length of 1 gram weight yarn, that is to say, 1 gram weight yarn is exactly 1 meter long, which is 1 (metric ) count yarn, the length of yarn weighing 1 gram is 200 meters long, and the fineness of the yarn is 200. Metric count is also a fixed weight system, so the larger the count, the thinner the yarn. It is used in both cotton and wool textile industries.
Unit conversion formula for fixed-length and fixed-weight systems
Metric system Conversion formula for count (Nm) and denier (D): D=9000/Nm
Conversion formula for British count (S) and denier (D) ：D=5315/S
The conversion formula between dtex and tex: 1tex=10dtex
Conversion formula between Tex and Denier (D): Tex=D/9
Tex and Imperial Count (S) ) conversion formula: Tex=K/S
K value: pure cotton yarn K=583.1; purified fiber K=590.5; polyester-cotton yarn K=587.6; cotton viscose yarn (75 :25)K=584.8; Cotton yarn (50:50)K=587.0
The conversion formula between Tex (Tex) and metric number (N): Tex=1000/ N
The conversion formula between decitex (dtex) and denier (D): dtex=10D/9
The conversion formula between decitex (dtex) and imperial count (S): dtex=10K/S
K value: pure cotton yarn K=583.1; pure fiber K =590.5; polyester-cotton yarn K=587.6; cotton viscose yarn (75:25) K=584.8; cotton yarn (50:50) K=587.0
dtex ) and metric number (N) conversion formula: dtex=10000/N</p
