4. Calculation of Tex and DeciTex

Question 1

The concept of linear density, as expressed by denier and tex

Answer 1

The fineness of different types of fibre or yarn is usually compared by looking at their linear density. Both denier and tex are used as units for expressing linear density.

Question 2

The denier is equal to the mass in grams of

Answer 2

9 000 m of yarn.

Question 3

The lower the number,

Answer 3

the finer the yarn will be.

Question 4

The denier system is usually used to measure

Answer 4

silk and manufactured fibres, filaments or yarns.

Question 5

The tex is equal to the mass in grams of……..

Answer 5

of 1 000 m of yarn.

Question 6

This is also referred to as the yarn number of a yarn, and is an indication of the

Answer 6

yarn’s thickness.

Question 7

The linear density of single fibres or very fine yarns is often expressed in

Answer 7

decitex

Question 8

The decitex is equal to the mass in grams of

Answer 8

10 000 m of yarn.

Question 9

The relationship between denier, tex and decitex can be illustrated by the following example:

Answer 9

If 9 000 m of a manufactured fibre, say nylon, has a mass of 9 grams, then it is a 9 denier fibre. One thousand metres of this fibre will then have a mass of 1 gram, making it a 1 tex fibre, while 10 000 m of the fibre will have a mass of 10 g, making it a 10 decitex fibre. Nylon pantihose are often made from a nylon fibre with a linear density of 9 denier, 1 tex or 10 decitex.

Question 10

I want to manufacture nylon pantyhose with liner density of 27denier. My supplier supplies yarns according to their tex. What tex fibre must i order?

Answer 10

tex = weight in grams per 1000meters

requiered fibre: 27 denier= 9000meters weighs 27grams

SO 27 grams divided by 9000eters times 1000 meters = 3 TEX

Decitex= weight in grams per 10000meters

1000meters of fibres weighs 3gram

So 10000 meters of fibre weighs 3 grams divided by 1000meters x 10000 = 30Decitex