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  #1  
Old 04-16-2010, 12:41 AM
vikram singh rathore vikram singh rathore is offline
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Default 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"?
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Old 04-16-2010, 01:12 AM
vikram singh rathore vikram singh rathore is offline
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Default Re: gsm calculate

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Originally Posted by vikram singh rathore View Post
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
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Old 04-16-2010, 01:12 AM
vikram singh rathore vikram singh rathore is offline
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Default Re: gsm calculate

no bodies is ther
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  #4  
Old 04-16-2010, 02:32 AM
JohnS JohnS is offline
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Default 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.
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Old 12-04-2010, 01:51 AM
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Default Count & construction

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Originally Posted by vikram singh rathore View Post
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.
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  #6  
Old 12-16-2011, 11:56 PM
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(warp ct/ EPI + weft ct/ PPI)*25.14 = gsm
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Old 11-05-2012, 09:24 AM
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Default Re: gsm calculate

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(warp ct/ epi + weft ct/ ppi)*25.14 = gsm
how do we derive constant 25.14?
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Old 11-05-2012, 09:20 PM
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Default Re: gsm calculate

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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
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Old 11-07-2012, 07:21 AM
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Default Re: gsm calculate

Quote:
Originally Posted by Robert Fogt View Post
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.
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  #10  
Old 12-03-2013, 10:26 PM
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Default Re: gsm calculate

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Originally Posted by vikram singh rathore View Post
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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