What is count? Types of Count?

What is count? Types of Count?

Answer:

Yarn count: 

The yarn count is a numerical expression which defines its fineness or coarseness. It also expresses weather the yarn is thick or thin. A definition is given by the textile institute – “Count is a number which indicates the mass per unit length or the length per unit mass of yarn.”

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.

Count is numerical expressions which express or indicate the coarseness or fineness of yarn used in textile.

Types of yarn count:

     a)     Indirect system- English, Metric, Worsted.

     b)    Direct system- Tex, Denier, Lbs/Spindle.

Indirect count: The count of yarn expresses the number of length units in one weight unit. Thus higher the count, finer the yarn. The system is generally used for cotton, worsted, linen (wet spun) etc.

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.

In indirect system of measuring count t is used for the measurement of length per unit weight of yarn where weight is considered to be constant.

When count increases, fineness increases. (count↑ fineness↑) 

Indirect count: N= (w x L)/ (W x l)

Where,

W = The weight of the sample.

w = The unit weight of the system.

L = The length of the sample.

l = The unit length of the sample.

In Details:

Indirect System:

English system: It is defined as the number of hanks 840 yds per pound is called yarn count.         

   English cotton count, N = (Length yds/840 yds) x (1 pound/Weight pound)

Metric system: It is defined as the number of hank (1000m) per kg.     

Metric count = (Length m/1000 m) x (1 kg/Weight kg)

Worsted system: It is defined as the number of hanks (540yds) per pound.

Worsted count = (Length yds/500 yds) x (1 pound/Weight pound)

Direct count: The count of yarn expresses the no. of weight units in one length unit. Thus higher the count, coarser the yarn. The system is generally used for synthetic fibre, jute, silk etc.

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.

In direct system the count is used for the measurement of weight per unit length of yarn where length is considered as constant.

Here whenever count increases, fineness decreases. (count↑ fineness↓) 

Direct count: N = (W x l) / (w x L)

Where,

N = The yarn number or, count.

W= The weight of the sample.

w = The unit weight of the sample.

L = The length of the sample.

l = The unit length of the sample.

In Details:

Direct System:

Tex system or, Lea count: It is defined as the weight in grams of 1000m is called Tex count.                    

Tex count = (Weight m/1 gm) x (1000 m/Length m)

Denier: The number or, count in the denier system is the weight in grams of 9000m.      

Denier count = (Weight m/1 gm) x (9000 m/Length)

Pounds per spindle (Jute system): Count in the pound per spindle system is the weight in pounds of 14400 yards of yarn.  

Pound per spindle = (Weight pound/1 pound) x (14000 yds/Length yds)

Conversion example: 
Example 1: If the metric count is given 50 then what will be the English cotton count? 

Solution: 

We know that, Ne=0.5905 X Nm 
Where, English cotton count is expressed as Ne 
And Metric count as Nm 
So English count will be Ne=0.5905 X 50=30 
Ans. 30 Ne 

Example 2: If the English cotton count is 30 then what will be the Tex count? 

Solution: 
Rom the count conversion table we know that, 
Tex count = 590.5/Ne 
Where, Ne=30, so Tex count will be=590.5/30=19.6 
Ans.19.6 Tex 

From the count conversion tool we can convert each of the count either direct or indirect from one to another count.