  ## Yearn numbering system (yearn count)

### Defination:

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

### Type of yearn count:

one distingguishes between two systems:

### 1. Direct count system

the weight of a fixed length of yearn is determined. the weight per unit length is the yearn count !

the common features of all direct count system are the length of yearn is fixed and the weight of yearn varies according to its fineness.

the following formula is used to calculate the yearn count:

## L

WHERE, N =yearn count or numbering system

W= weight of the sample at the official regain in the unit of the system.

L= length of the sample

I= unite of length of the sample

 Numbering system unit of length(L) unite of weight(W) Tex system, Tt 1000 metres No. of Grams Denier, D or Td 9000 metres No. of Grams Decitex,dtex 10000 metres No. of Grams Millitex, mtex 1000 metreas No. of Milligrams Kilotex, ktex 1000 metres No. of Kilograms Jute count 14400 metres No. of pounds (lb)

In brief, definition of the above systems in as follows:

Tex system                           : No. of grams per 1000 metres

Denier                                   : No. of grams per 9000 metres

Decitex                                  : No. of grams per 10000 metres

Millitex                                   : No. of milligrams per 1000 metres

Kilotex                                   : No. of kilograms per 1000 metres

Jute count                              : No. of lb per 1000 metres

• the tex of the yearn indicates the weight in grammes of 1000 metres yearn. so that 40 tex means 1000 metress of yearn weight 40 gm.
• the denier of a yearn indicates the weight in grammes of 9000 metres yearn. so that 150 D means 9000 metres of yearn weight 150 gm and 100 D means 9000 metres of yearn weight 100 gm.

from above discussion it is concluded that, higher the yearn number (count) coarser the yearn  and lower the number finer the yearn.

### 2. indirect count system:

the length of a fixed weight of yearn is measured. the length per unit weight is the yearn count!

the common features of all indirect count systems are the weight of yearn is fixed and the length of yearn varies according to its fineness.

the following formula is used to calculate the yearn count:

## w x i

WHERE,

N =yearn count or numbering system

W= weight of the sample at the official regain in the unit of the system.

L= length of the sample

I= unite of  length of the sample

 numbering system unite of length (l) unit of weight (w) English cotton count 840 Yds 1 pound (lb) Metric count 1000 metres 1 kg Woollen count (YSW) 256 Yds 1 pound (lb) Woollen count (Dewsbury) 1 Yds 1 ounce (oz) Worsted count 560 Yds 1 pound (lb) Linen count 300 Yds 1 pound (lb)

### in brief, defination of the above system is as follows:

English count system                    : No. of 840 yds length per kg

Metric count                                  : No. of kilometer per kilogram

Woollen count (YSW)                   : No. of 256 yds length per pound

Woollen count (Dewsbury)           : No. of yd s lengths per oz

Worsted count                              : No. of 056 yds length per pound

Linen count                                  : No. of 300 yds length per pound

## some importent conversation factor:

1 yard             =  0.9144 metre

1 metre           =  1.0936 yards

1 metre           =  39.37 inch

1 cm                =  0.3937 inch

1 gm                =  0.0353 oz

1 oz                  =  28.350 gm

1 pound           =  453.6 gm

1 kg                  =  2.2046 pound

1 m/ kg             =  0.496 yd/ lb

1 inch               =  2.54 cm  