OCS’s Answer:
Normally spirality occurred in knitted garments and fabric that made by using twill fabrics. Spirality or twisting in a garment is appeared after washing. As a result one of the side seams comes at front of the garment when wearer wears it. Spirality percentage depends on fabric torque and garment structure.
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There are two ways you can measure the spirality of a fabric. One, make a garment sample (half sleeve T-shirt) and measure twisting percentage of garment side seam.
In the right side image a garment sample is shown before wash and after wash. Spirality of fabric is measured using formula Spirality% = 100* X/ Y or 100*X/Y’ Where, X is displacement of side seam at bottom after wash, Y is side seam length and Y’ is T-shirt body length. |
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Secondly, In case you can’t make T-shirt, still you can perform spirality test by making a fabric bag keeping two ends open. Follow the below steps to measure fabric spirality.
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- Cut a fabric specimen in rectangle shape of 20” X 10” dimension. 20 inch in weft direction and 10 inch in warp or wale direction.
- Fold the fabric and join two ends by over edge stitch. It will look like a cylinder.
- Mark a square (8’’ X 8’’) with fabric marker on one side of the folded and stitched fabric.
- Wash the specimen in washing machine and tumble dry.
- Now put the bag on a flat table with its natural fall. Don’t stretch.
- Now check and measure displacement of perpendicular line. Suppose displacement is 0.5 inch.
- Use the above formula to calculate spirality of the fabric.
- Therefore, Spirality of the sample fabric is 6.25% (100*C’C/AC’ = 100*0.5/8)
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