A polyester T-shirt can pass measurements before washing and still develop twisted side seams afterwards. The cause is often residual torque or spirality in the knitted structure rather than simple shrinkage.
What Causes Twisting?
- Yarn twist and residual torque
- Knitting imbalance
- Fabric not fully relaxed before heat-setting
- Off-grain cutting
- Uneven finishing tension
Why Washing Reveals the Problem
Washing relaxes the fabric structure. Stored rotational forces can then release, causing courses and wales to rotate and moving side seams away from their original position.
How to Test
- Relax the bulk fabric.
- Measure initial spirality.
- Make a pre-production garment from the actual lot.
- Wash and dry under the intended care method.
- Measure side-seam displacement and garment distortion.
Prevention
Control yarn and knitting parameters, allow proper fabric relaxation, verify heat-setting, cut on the correct grain and approve wash-tested garments before bulk production.
Common Mistake
Do not treat all twisting as ordinary shrinkage. Length and width can remain within tolerance while the garment still rotates visibly.
Final Thoughts
Twisting is a fabric-geometry issue that must be controlled before bulk sewing. Spirality testing on the actual production lot is essential.
Need Help Planning Polyester Fabric for Bulk Garment Production?
Send Walrus – Yes India Can your garment type, GSM, DIA / width, colour, quantity and end use. We can help shortlist suitable polyester fabric options for bulk production.
Call / WhatsApp:
+91 90472 77722
+91 90420 77722
Website: yesindiacan.in
