There is no direct formula to calculate yarn count against knit fabric GSM. The yarn count and GSM of a knit fabric are related, but they are not directly proportional. The yarn count is a measure of the fineness of the yarn, while the GSM is a measure of the weight of the fabric per unit area. The GSM of a knit fabric will depend on the yarn count, the knitting density, and the fabric construction.
There are some general guidelines that can be used to estimate the yarn count for a given GSM of knit fabric. For example, a single jersey fabric with a GSM of 130 will typically use a yarn count of 30s. However, the actual yarn count will need to be determined by considering the specific knitting machine, the yarn type, and the desired fabric properties.
Here are some of the factors that can affect the yarn count against knit fabric GSM:
- Yarn type: The type of yarn will affect the yarn count. For example, cotton yarn is typically less fine than wool yarn, so it will have a lower yarn count.
- Knitting density: The knitting density is the number of stitches per unit area. A higher knitting density will result in a fabric with a higher GSM, even if the yarn count is the same.
- Fabric construction: The fabric construction can also affect the GSM. For example, a double knit fabric will typically have a higher GSM than a single jersey fabric.
If you need to calculate the yarn count for a specific knit fabric, it is best to consult with a textile engineer or a yarn manufacturer. They will be able to help you determine the yarn count that is needed to achieve the desired GSM and fabric properties.
Definition of Yarn Count : Yarn count is a numerical value which refers to the coarseness or fineness of the yarn. It is calculated by taking into account the length and weight of the yarn. The weight of the yarn is just the mass per unit length of the yarn.
Single jessery:
Definition of Fabric GSM : Fabric GSM refers to the Grams per Square Meter of the fabric. It is the weight of the fabric per square meter, measured in grams.
Example : Single jersey fabric is 130 GSM. Now find the yarn count?
Ans: For single jersey, 4300/GSM= 4300/130= 33.08,You can make this kind of fabric with 32/34 count of yarn.
Another System : For single jersey,(-0.141 x GSM) + 50.22 = (-0.141 x 130) + 50.22 = 31.89,So you can make fabric with 32 count of yarn.
We may also add some others:
S/J = 4300 ÷ GSM
Pique = 5200 ÷ GSM
Terry = 6240 ÷ GSM
Fleece = 7200 ÷ GSM
Interlock = 7200 ÷ GSM
1x1 Rib = 6000 ÷ GSM
Lacost = 5500 ÷ GSM
2x2 Rib = 6250 ÷ GSM
Some Another Tricks:
S/J = (-0.141x GSM) +50.22
Pique = (-0.146 x GSM) +57.16
Double Lacost = (-0.167 x GSM) +64.36
1x1 Rib = (-0.123 x GSM) +54.57
Interlock = (-0.206 x GSM) +80.56
Lycra 1x1 Rib = (-0.119 x GSM) +59.12
Lycra 2x2 Rib = (-0.108 x GSM) +56.62
These are just general guidelines, and the actual yarn count will need to be determined by considering the specific factors mentioned above.
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