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#1
04-16-2010, 01:41 AM
 vikram singh rathore Junior Member Join Date: Apr 2010 Posts: 3 Rep Power: 0
gsm calculate

sir,
please solve my problem and give formulla to calculate gsm of fabric if i know count and construction
2/20x2/20 40x36 cotton flex- how can we calculate gsm 48"?
#2
04-16-2010, 02:12 AM
 vikram singh rathore Junior Member Join Date: Apr 2010 Posts: 3 Rep Power: 0
Re: gsm calculate

Quote:
 Originally Posted by vikram singh rathore sir, please solve my problem and give formulla to calculate gsm of fabric if i know count and construction 2/20x2/20 40x36 cotton flex- how can we calculate gsm 48"?
can u do answer for me
#3
04-16-2010, 02:12 AM
 vikram singh rathore Junior Member Join Date: Apr 2010 Posts: 3 Rep Power: 0
Re: gsm calculate

no bodies is ther
#4
04-16-2010, 03:32 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,220 Rep Power: 18
Re: gsm calculate

I don't know if there is a formula that calculates it with sufficient accuracy. If there is, I don't know it. It would be easier to just weigh a finished piece of known area. DFetermine weight in grams, divide by area in square meters.
#5
12-04-2010, 02:51 AM
 Unregistered Guest Posts: n/a
Count & construction

Quote:
 Originally Posted by vikram singh rathore sir, please solve my problem and give formulla to calculate gsm of fabric if i know count and construction 2/20x2/20 40x36 cotton flex- how can we calculate gsm 48"?

Sir,

How do calculate count & construction of woven fabric.
#6
12-17-2011, 12:56 AM
 Unregistered Guest Posts: n/a
Re: gsm calculate

(warp ct/ EPI + weft ct/ PPI)*25.14 = gsm
#7
11-05-2012, 10:24 AM
 Unregistered Guest Posts: n/a
Re: gsm calculate

Quote:
 Originally Posted by unregistered (warp ct/ epi + weft ct/ ppi)*25.14 = gsm
how do we derive constant 25.14?
#8
11-05-2012, 10:20 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,416 Rep Power: 12
Re: gsm calculate

Quote:
 Originally Posted by Unregistered how do we derive constant 25.14?
I found two formulas here.
http://www.onlineclothingstudy.com/2...en-fabric.html

Fabric GSM = (EPI/warp count + PPI/Weft count) x (100+crimp %) X 0.2327

and this one:
Fabric GSM= ((EPI/warp count X 1.1) + (PPI/weft count x 1.04)) x 23.5

Notice that for a source they use this website. Normally that is fine but it points to a forum post so its only as accurate as the original poster.
http://forum.onlineconversion.com/ar...hp?t-7064.html
#9
11-07-2012, 08:21 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,220 Rep Power: 18
Re: gsm calculate

Quote:
 Originally Posted by Robert Fogt I found two formulas here. http://www.onlineclothingstudy.com/2...en-fabric.html Fabric GSM = (EPI/warp count + PPI/Weft count) x (100+crimp %) X 0.2327 and this one: Fabric GSM= ((EPI/warp count X 1.1) + (PPI/weft count x 1.04)) x 23.5 Notice that for a source they use this website. Normally that is fine but it points to a forum post so its only as accurate as the original poster. http://forum.onlineconversion.com/ar...hp?t-7064.html
I think the formula is reasonable as I can "almost" derive it from basic principles.

In a square meter of cloth, 1 m on each side, the total numbers of ends and picks is the EPI and PPI divided by 0.0254 m/in.

Because of the over and under-weaving, the threads in each direction have to be slightly over 1 m in length. I am assuming that the 1.1 and 1.04 factors are experiential factors that make this correction. Therefore 1.1*EPI/0.0254 and 1.04*PPI/0.0254 give us the total length of thread in each direction in meters.

For cotton, a warp or weft count of n means that 840 yd of thread weighs (1/n) pounds. To convert this to g/m, multiply by 453.59237 g/lb, divide by 840 yd, and divide by 0.9144 m/yd.

All of these conversion factors may be moved outside the parentheses, resulting in
453.59237/(0.0254 * 0.9144 * 840) = 23.25.

The first formula uses the corrections as a percent, if they were a decimal fraction, the constant would be 23.27. The 2nd formula uses 23.5. I believe the correct constant is 23.25 based on conversion, but any minor errors may be covered up by adjusting the two correction factors.
#10
12-03-2013, 11:26 PM
 Unregistered Guest Posts: n/a
Re: gsm calculate

Quote:
 Originally Posted by vikram singh rathore sir, please solve my problem and give formulla to calculate gsm of fabric if i know count and construction 2/20x2/20 40x36 cotton flex- how can we calculate gsm 48"?
(40 + 36 ) / 10 x 100 x 0.2327 = 177 gsm

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