Fabric Weight Calculation: GSM Calculation from Running Length

Fabric Weight Calculation

There are two ways of fabric weight calculation. One is the weight per unit area such as GSM (grams per square meter) or oz / yd2 and another way is weight in running length.

Fabric Weight Calculation

Fabric Weight Calculation from Running Length:
Calculate the GSM of the following technical textile fabric,

120 x 70
……………………… x 58
30 x 30

Answer:

For warp weight calculation

Here EPI is 120

Total number of ends = 120 x 39.37

Length of each end = 1 m + 1m x 0.03 (warp crimp% = 3%)
= 1.03m

Total length of warp yarn = 120 x 39.37 x 1.03 m

We get from the yarn numbering system,

……..L x W
Ne = ………….
……..W x l

………..L X W
∴ W = ……………..…..
….. …..Ne x l

….120 x 39.37 x 1.03 x 453.6
=……………………………………………….…. gm
……….40 x 840 x 0.9144

For weft weight calculation

Here, PPI = 70

Total number of picks = 70 x 39.37

Length of each pick = 1m + 1m 0.05 (weft crimp% = 5%)
= 1.05m

Total length of weft yarn = (70 x 39.37 x 1.05) meter

We get from the yarn numbering system,

………L x w
Ne =…………………..
………W x I

……..L x w
W =…………….……
……..Ne x l

….70 x 39.37 x 1.05 x 453.6
= ………………………………………….………..gm
………30 x 840 x 0.9144

Total weight of the fabric per square meter,

….120 x 39.37 x 1.03 x 453.6          70 x 39.37 x 1.05 x 453.6
= ………………………..……………. + ……………………………….…….……..
……….40 x 840 x 0.9144                      30 x 840 x 0.9144

……120 x 1.03        70 x 1.05                  39.37 x 453.6
= (…………………+ …………………) x  .………………………………………
………….40                   30                        840 x 0.9144

……120 x 1.03         70 x 1.05
= ( …………….. + ..………………..  ) x 23.25
…………40                    30

……………….EPL x 1.03          PPI x 1.05
GSM = (……………….….. + …………………) X 23.25
……………………Newa                 Newe

Similarly,

oz/yd2 can be calculated by the following formula:

…………………EPI x 1.03     PPI x 1.05
oz/yd2 = (……………..….. + ……………..….. ) X 0.686
…………………….Newa             Newe

1.03 = For warp crimp (warp crimp % = 3%)

1.05 = For weft crimp (weft crimp % = 5%)

The crimp % for warp and weft can be changed. These two values normally applicable for maximum common fabric, although crimp% mainly depends on fabric structure.

Reference:
Understanding Textile for A Merchandiser (Second Edition) by Prof. Dr. Engr. Shah Alimuzzaman Belal.

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  4. How to Select Yarn Count for Specific Fabric GSM
  5. Relation between Finished GSM and Yarn Count of Various Fabrics

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