Yarn count.Types of yarn count system
Yarn count or number is a measure of the fineness of the yarn. As the yarns are flexible and uneven, the fineness of the yarn is expressed in terms of length and weight, rather than measuring the diameter of the yarn.
Types of Yarn Count:
- Direct Count System
- Indirect Count System
Direct Count System
If the length remains the same and the change in weight is considered a measure of fineness, it is fed into the direct yarn counting system. Therefore, a greater weight means a coarser the yarn. There are multiple measurement units for length and weight and multiple direct counting systems. Direct systems, the count is calculated as follows: If w is the sample weight, l is the sample length, and L is the unit length of the system, then count, N = (w × L) / l.
N = (w × L) / l
W=weight of a sample
L= unit of length
l= length of the sample
There are three Direct Count System
Tex – The weight of 1000 metre of yarn in gramme is the tex value
of the yarn. Tex is a universal yarn counting method and basically Used to count different yarns in different countries.
Denier – Weight of 9000 meters of yarn in gramme is the denier
value of yarn count. This system is usually followed staple and filament fiber and fine yarn.
Jute – Weight of 14400 yds in pound is the count.
Indirect Count System
In case of indirect yarn counting system, the weight is fixed and the variation of length indicates the fineness of yarns.
If w is the weight of a sample, W is the unit of weight of the system, l is the length of the sample and L is the unit of length of the system, then
count, N = (W× l) / (w× L)
Cotton System (English ): The number of hanks of 840 yards in one pound weight is the count of yarn.
Cotton system (Continental) : The number of hanks of 1000 meters in 500gms weight is the count.
Worsted system: No. of 560 yd lengths per lb