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  • 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
    Re: gsm calculate

    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

    Comment


    • #3
      Re: gsm calculate

      no bodies is ther

      Comment


      • #4
        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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        • #5
          Count & construction

          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.

          Comment


          • #6
            Re: gsm calculate

            (warp ct/ EPI + weft ct/ PPI)*25.14 = gsm

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            • #7
              Re: gsm calculate

              Originally posted by unregistered View Post
              (warp ct/ epi + weft ct/ ppi)*25.14 = gsm
              how do we derive constant 25.14?

              Comment


              • #8
                Re: gsm calculate

                Originally posted by Unregistered View Post
                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

                Comment


                • #9
                  Re: gsm calculate

                  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
                    Re: gsm calculate

                    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

                    Comment

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