Measure the following:
v Fabric weight by square yards
v Crimp Percentage
Following are a few general rules to find out the warp and weft direction of the fabric:
Ø The threads that run parallel to the selvedge are the warp threads.
Ø Weft threads are generally more stretchable.
Ø There are more warp threads as compared to weft threads per square inch.
Ø Yarns which are more aligned and less hairy are the warp threads.
WEIGHT BY SQUARE YARDS
To find the Weight by Square Yards of the fabric.
- Weighing Balance
- Fabric Scissor
v Cut a Swatch of 6” x 6” using Fabric Scissor.
v Weigh the cutting piece using a weighing balance.
v Convert 6” x 6” into 36” x 36” i.e. yards.
v Calculate the weight per square inch as shown in the results.
The results of the specimen enclosed are:
Weight of 6” x 6” = 2.72 gm
Weight per square yards = 36” x 36” x 2.72
6” x 6”
= 97.92 gm
To calculate the crimp percentage of warp and weft threads.
v Pull one of warp thread and one of the weft thread.
v Cut the threads to get a length of 6 inches using a scale.
v Stretch each thread of both weft and warp threads and then measure the length of the thread (Final Length).
v Following formula is used to find the Crimp Percentage:
Crimp Percentage = Final Length – Initial Length x 100
Average of warp threads is 6.16 inch
Average of weft threads is 6.34 inch
Crimp Percentage = 6.16 – 6 X 100
Crimp Percentage = 6.34 – 6 X 100
Conclusion:The result shows that weft threads have a more crimp percentage than warp threads. It means weft threads more stretch than warp threads