Yarn Count System and Conversions

YARN NUMBERING SYSTEM

Ramandeep Singh
B.Tech, Dept. of Textile Engineering
Giani Zail Singh Punjab Technical University Campus,
Bathinda, Punjab, India
Email: rmnsandhu3335@gmail.com





Count or Linear Density:
The different end-uses require yarns of different thickness . The accepted way to indicate the thickness of a yarn or material in various stages of yarn manufacturing , is to give the yarn count or linear density.
Count measurement machine
The length of the material is measured out , and then weighed . Count is expressed as the length per unit mass.The linear density is expressed as mass per unit length . Each system is referred to as being either indirect or direct .

Types of Numbering Systems :
There are two types of systems available for expressing the count / linear density of the yarn / material :
  1. INDIRECT SYSTEM
  2. DIRECT SYSTEM
INDIRECT SYSTEM :
In this system the weight unit is fixed and the length of the yarn varies as per its thickness . The following system are indirect systems :
  • New English System
  • New Metric System
New English System :
The number of hanks of 840 yards in one pound weight is known as the count of the yarn . It is also known as cotton count and is denoted by Ne .

                           No. of Hanks ( Hank of 840 yards )
Count (Ne) = ---------------------------------------------------------
                                           1 lb weight

New Metric System :
The number of hanks of 1000 meters length in one kilogram weight is called the count of the yarn in this system . It is denoted by Nm .

                           No. of Hanks ( Hank of 1000 meters )
Count (Nm) = ---------------------------------------------------------
                                        1 kg weight

DIRECT SYSTEM :

In this system the length unit is fixed and the weight of the yarn / fiber varies as per its thickness . The following system are direct systems :
  • Denier System
  • Tex System
Denier System :
Weight in grams of yarn/fiber of 9000 meter length is called the Denier of that particular yarn/fiber .

Denier = weight in grams of 9000 meters length

Tex System :
Weight in grams of yarn/fiber of 1000 meter length is called the Tex of that particular yarn/fiber .

Tex = weight in grams of 1000 meters length 
 
Count Comparison Table:

    GIVEN
DETERMIND
Ne
Nm
Tex
Decitex
Denier
Ne
1.0
Nm / 1.69
590.5/Tex
5905/d tex
5315/denier
Nm
1.69 x Ne
1.0
1,000/Tex
10,000/d tex
9000/denier
Tex
590.5/Ne
1,000 / Nm
1.0
Decitex0.1
Denier / 9
Decitex
5905/Ne
10,000/Nm
Tex x 10
1.0
Denier / 0.9
Denier
5315/Ne
9,000/Nm
Tex x 9
decitex0.9
1.0

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