Yarn Numbering System (Yarn Count)

Yarn Count:

Count is a numerical value, which express the coarseness or fineness (diameter) of the yarn and also indicate the relationship between length and weight(the mass per unit length or the length per unit mass)of that yarn. Therefore, the concept of yarn count has been introduced which specifies a certain ratio of length to weight.

The fineness of the yarn is usually expressed in terms of its linear density or count. There are a number of systems and units for expressing yarn fineness. But they are classified as follows .

Types of Yarn Count:

· Direct Count System

· Indirect Count System

1. Direct Count System:

The weight of a fixed length of yarn is determined. The weight per unit length is the yarn count! The common features of aII direct count systems are the length of yarn is fixed and the weight of yarn varies according to its fineness.

The following formula is used to calculate the yarn count:

N= (W×l) / L

Where,

N =Yarn count or numbering system

W =Weight of the sample at the official regain in the unit of the system

L=Length of the sample

l=Unit of length of the sample

Indirect Count System:

The length of a fixed weight of yarn is measured. The length per unit weight is the yarn count. The common features of all indirect count systems are the weight of yarn is fixed and the Length of yarn varies according to its fineness.

The following formula is used to calculate they are count:

N = (L×w) / W×l

Where,

N =Yarn count or numbering system

W =Weight of the sample at the official regain in the unit of the system

L=Length of the sample

l=Unit of length of the sample

w = Unit of weight of the sample.