Single Jersey Curling and the Finishing Sold as a Fix
Single jersey curl stems from unbalanced yarn torque and asymmetrical loop tension; durable flat performance demands structural yarn balancing rather than temporary resin finishes.
S-Twist Z-Twist Balance
Twist Balancing
Yarn twist configurations determine the structural stability and torque-free behavior of knitted and woven fabrics. Achieving an s-twist z-twist balance prevents fabrics from distorting, curling, or skewing during the manufacturing and laundering stages. It involves the strategic pairing of yarns with opposite twist directions to neutralize the residual torque.
Torque Neutralization
Industrial spinning processes produce yarn with either a left-handed (S) or right-handed (Z) helix angle. When using an s-twist z-twist balance, the clockwise and counterclockwise twisting forces cancel each other out when the yarns are combined or knit. This mechanical balance keeps the stitches upright and prevents the fabric from twisting.
Spirality Mitigation
Knitted garments made from single-jersey fabrics are highly susceptible to skewing if the yarn twist is not balanced. By implementing s-twist z-twist balance in the knit structure, mills can eliminate the spirality that often ruins the fit and look of t-shirts. This balance can be achieved by feeding alternating courses of s-twist and z-twist yarns or by using plied yarns.
It reduces the need for heavy chemical finishes that are otherwise used to temporarily set the unbalanced fabric structure.
Woven Stability
Woven fabrics also benefit from this twist balance to avoid bowing or skewing in the loom state. When weavers use s-twist z-twist balance in the warp or weft, the resulting fabric has a smoother, flatter finish that is easier to coat or print. This provides a stable foundation for high-quality finishing and apparel assembly.