The larger the value, the finer the yarn. Its units of measurement include metric numbers (Nm) and British numbers (Ne).
1, metric count (Nm) refers to the length of one gram of yarn (or fiber) when moisture regain is measured.
Nm=L (unit m)/G (unit g).
The metric count can be expressed in the form of "20 counts, 40 counts", which means that the length of one gram of yarn is 20m or 40m. The metric number of strands is expressed by dividing the metric number of single yarns constituting the strands by the number of strands, for example, 26/2, 60/2, etc. If the number of single yarns constituting the strands is different, the metric number of the strands is expressed by the number of single yarns with diagonal lines, such as 2 1/42. The metric number of chains can be calculated as follows: nm =1(1/n1+1/N2+-.
At present, the thickness of pure yarn and blended yarn of wool spinning and wool chemical fiber in China is still partially expressed by metric count.
2. Inches (Ne) refers to the length of cotton yarn weighing 1 pound (453.6g) which is several 840 yards (wool yarn is 560 yards per pound) (1 yard = 0.9144m).
Ne=L (unit y)/{G (unit p)X840)}.
English count is the old national standard measurement unit of cotton yarn thickness, which has been replaced by special count. If the length of the yarn with a weight of 1 lb is 60,840 yards, the fineness of the yarn is 60 inches, which can be recorded as 60S. The representation and calculation method of English shares is the same as that of metric shares.
(2) Fixed length system: refers to the weight of a certain length of fiber or yarn.
The smaller the value, the finer the yarn. Its units of measurement include the special number (Ntex) and denier (Nden).
1, Tex (tex) refers to the grams of weight of 1000m long fiber or yarn when moisture regain is measured, also known as count.
NTEX =1000g (unit gram)/L (unit meter)
For a single yarn, the tex number can be written as "18 tex", that is, when the yarn length is 1000m, its weight is18 g. The number of shares is equal to the number of shares multiplied by the number of single yarns. For example, 18X2 means that two single yarns 18tex are plied, and the fineness of the plied yarn is 36 tex. When the single yarn count of the plied yarn is different, the yarn count is the sum of the single yarn counts, such as 18+15, and the combined yarn count is 33.
For fiber, the index of tex is too large, which is often expressed by Ndtex. The decitex (unit dtex) refers to the weight grams of 10000 meter long fiber at a specific moisture regain.
Ndtex =10× ntex =10000g (unit g)/L (unit m).
2. Denier (Nden) refers to the weight of 9000-meter-long fiber or yarn in grams when the moisture regain is specified.
Nden = 9000G (unit gram)/L (unit meter)
Denier number can be expressed as: 24 denier, 30 denier, etc. The denier of plied yarn is expressed in the same way as special numbers. Denier is generally used to indicate the fineness of natural fiber filaments or chemical fiber filaments.
Second, the conversion between systems:
1, English number Ne and metric number Nm.
Pure chemical fiber: Ne=0.59 1Nm pure cotton: Ne=0.583Nm.
Blended yarn: such as T/JC (65/35) 45SNE = (0.591* 65%+0.583 * 35%) nm.
2. Conversion between decitex and metric number (Nm): Ndtex nm = 10000.
3. Conversion between denier (Nden) and Ndtex: Nden=0.9Ndte