Thread consumption.(How to find sewing thread consumption).
Final equation was (2000*94)/4000=47
To calculate the amount of thread in a seam, you can: - Measure the actual amount of thread consumed in a specific length of seam. - Calculate the thread consumption by using mathematical stitch formulas based on the thickness of the seam and the number of stitches per inch.
We should follow when calculate it with below steps :
Measure the actual thread consumed in a specific length of seam along the garments.
Calculate the thread consumption by using mathematic stitch formulas based on seam characters ( example : single stich, double stitch, chainstitch, overlock, etc ) also please take attentions in thickness of thread.
Then convert it with total yardage contained in one cones of sewing thread & total quantity of garments.
Measuring Actual Thread Consumed
A specified length of the seam, for example 3 inches, is measured and then the thread is removed by carefully unraveling the stitch. You can then calculate the amount of thread consumed in one inch and multiply this factor times the total length of the seam measured in inches.
For example:
Length of seam is 42 inches or 1.17 yards.
Stitch and seam construction: 401 SSa-1.
Specified length of thread removed from a seam equals 3 inches.
Needle thread removed = 9 inches
Looper thread removed = 8 inches
Calculation:
Needle thread factor = 9 ÷ 3 = 3 inches of needle thread per inch of seam.
Looper thread factor = 8 ÷ 3 = 2.67 inches of looper thread per inch of seam.
Total needle thread consumed = factor 3 X 1.17yds = 3.51 yds
Total looper thread consumed = factor 2.67 X 1.17yds = 3.12 yds
Total Thread = 3.51 + 3.12 = 6.63 yards per seam.
Generally a 10 to 15% waste factor is added due to chaining-off, thread breaks, repairs, etc.
If a waste factor of 15% is selected then:
6.63 yards/seam X 1.15 = 7.62 yards/seam including 15% waste factor.
Obviously you must do this for each seam to determine the total amount of thread consumed in the finished product.
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