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Relation between Stitch Lengths, Yarn Count, GSM & Machine Dia

 
Stitch length:
Stitch length (knitting) is the length of yarn in a knitted loop. Stitch length is theoretically a single length of yarn which includes one needle loop half the length of yarn (half of a sinker loop) between that needle loop and the adjacent needle loops on either side of it.
Yarn count:
Yarn count is the numerical expression which indicates or expressed the fineness or coarseness of yarn. According to Textile Institute, Count a number indicating the mass per unit length or the length per unit mass of yarn.

GSM:
GSM’ means ‘Gram per square meter’ that is the weight of fabric in gram per one square meter. By this we can compare the fabrics in unit area which is heavier and which is lighter. The GSM of fabric is one kind of specification of fabric which is very important for a textile engineer for understanding and production of fabric.

1. Relation between Yarn count & GSM. 
 
For Single jersey, Count=4350/GSM and 
Ne=50.22-0.141GSM (For single Jersey) 
Ne=54.57-0.123GSM (For 1x1 Rib) 
Ne=59.12-0.119 GSM (For Lycra 1x1 Rib)

2. Relation between GSM, Stitch Length and Yarn Count.

                                 K
GSM = …………………………………….                    k=constant
             Yarn count (Ne) X Stitch length

K=12068.59 (Single jersey or plain) 
K=16431.497 (1x1 Rib) 
K=19005.333 (2x1 Rib)

3. Relation between Fabric Dia & machine Diameter.
Fabric Dia = (Machine Dia X 2) ± 5% for single jersey
Fabric Dia = (Machine Dia X 4/3) ±5% For Rib.

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