Yarn Count
Yarn count is a term used to express the thickness of yarn. In spinning process, there is a relation between the weight of the original fibers and the length of yarn. This relation is indicated as thickness. Thickness of yarn is determined by the extent of drawing process (varying draft) and designated by number. The number is called count.
So, when we say what is
yarn count? The answer will be, yarn count is the weight per unit length or
length per unit weight which expresses the fineness or coarseness of yarn.
According to Textile
Institute, “Count, a number indicating the mass per unit length or the length
per unit mass of yarn.
Types of count system
1. Direct system
2. Indirect system.
2. Indirect system.
Another system is
classified as third type of count and that is “Tex”. Tex is also
called Universal count. International Organization for Standardization (ISO)
fixed the relationship between weight and length for Tex. The greater
the weight, the thicker the yarn and Tex will be greater number. We
will discuss it under Direct system.
Direct System
In this system, the count
of yarn expresses the no of weight units in one length unit. Higher the count,
coarser the yarn. This system is generally used for Man made fibre, jute, silk
etc.
Now, let’s see the how count is mathematically calculated.
Let,
N = The yarn number or count.
W = The weight of the sample.
w = The unit of weight of the system.
L = The length of the sample.
l = The unit of length of the system.
Now, Count, N = (W×l)/L
Indirect System
N = The yarn number or count.
W = The weight of the sample.
w = The unit of weight of the system.
L = The length of the sample.
l = The unit of length of the system.
Now, Count, N = (W×l)/L
Indirect System
In this system, the count
of yarn is expresses the no of length unit in one weight unit. Here, when count
is higher, then yarn will be finer. The system is usually used for cotton,
worsted, metric, french, linen (wet spun) etc.
Let,
N = The yarn number or count.
W = The weight of the sample.
w = The unit of weight of the system.
L = The length of the sample.
l = The unit of length of the system.
Now, Count, N = (L×w)/(l×W)
N = The yarn number or count.
W = The weight of the sample.
w = The unit of weight of the system.
L = The length of the sample.
l = The unit of length of the system.
Now, Count, N = (L×w)/(l×W)
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