Sideways twisting of seams, called spirality or torque, appears when yarns are overtwisted, when the circular machine has few feeders, or when the tube was set off-grain in finishing. Finishing can reduce the problem through sufficient relaxation, correct compacting and straightening of wales on the stenter or compactor, but it cannot repair a wrong yarn or structure. For low risk, ask for a balanced-twist yarn or a tubular fabric with controlled torque, and test shrinkage in length and width separately. Cutting correctly along the wales also helps.
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