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Dear All,
Dear All,
GSM means the weight in gram per square meter of fabric.GSM is a very important parameter for specified a certain quality of knitted fabric. The production of knitted fabric is calculated in weight. The GSM cutter is very popular and easy usable GSM testing instrument used in most knitted factory. But the construction of this cutter is very simple. It is circular disk of 100 square cm area with sharp blade attached to its edge. So 100 square cm of fabric can easily cut by it and weighted at the electric balance to get GSM reading.
There are two formulas
for calculating the GSM of a knitted fabric
First formula is as
under:
Course per inch X Stitch length X 39.37 X 39.37 X Tex
GSM =
----------------------------------------------------------------------
1000
X 1000
aNd
WPI X CPI X SL(mm)
GSM =
----------------------------- X 0.9155
Count(Ne)
CALCULATION OF WALES
PER INCH (WPI):
We calculated the
number of Wales in 10 inch fabric unraveling the yarn. Then we divide the
no of total Wales by 10 inch to getting the Wales per inch.
CALCULATION OF COURSE
PER INCH (CPI):
We calculated the
number of course in five inch with the help of counting glass and needle. Then
we divide the total no of course by five inch to getting the course per inch.
MEASUREMENT OF STITCH
LENGTH (SL mm):
Stitch length is
theoretically a single length of yarn which includes one needle loop and
adjacent needle loops on either side of it. Loop exits in course in course length and it is that which
influence fabric dimension and other properties including weight.
In order to determine
the stitch length, we count 100 no Wales or stitch and count its length by
hanging the yarn on the stitch counter. The reading is found in mm unit.
MEASUREMENT OF YARN
COUNT:
We have fallowed a
different way to find out the count of the yarn. At first we unravel a
considerable no yarn from the fabric. Then we measured the total length of the
yarn and measured the weight of that no of yarn. From these weights, we find
out the count of the yarn.
The equation we
followed is as follow:
N x L x 453.6
Count =
----------------
Wt x 36 x 840
Where,
N = number
of yarn in bundle.
L =
length of yarn.
Wt = weight of
yarn.
Another formula is the
following:
Ks x Tex
GSM =
---------------------
Stitch length (mm)
Where,
Ks is a constant. Its
value is different for different fabric structure and fabric type. Ks is
calculated and estimated as below:
GSM x Stitch length
Ks
= -----------------------------
Tex
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