How to solve the problem of shrinkage in knitted fabrics

How to solve the problem of shrinkage in knitted fabrics?

To prevent shrinkage issues in mass production of knitted products, factories need to establish a closed-loop control system throughout the entire process.

· Control fabric at source: Request authoritative shrinkage test reports from suppliers. Inspect each batch upon arrival according to standards (e.g., GB/T 8629). Qualified knitted fabrics typically require shrinkage ≤5%~6%; return or pre-shrink if exceeded.

· Bulk pre-shrinking treatment: Before bulk cutting, conduct mechanical pre-shrinking (e.g., rubber blanket compactor) or steam pre-shrinking. For high-end orders with sensitive shrinkage, pre-washing may be used (higher cost). After pre-shrinking, fabric must be rested for at least 24 hours to fully relax.

· Standardized cutting and sewing: Add shrinkage allowance to patterns based on actual test results; lay out with straight grain; use low tension and proper round-point needles during sewing to avoid stretching the cut pieces.

· In-process and finished garment verification: During mass production, randomly take cut pieces or semi-finished goods from each batch for wash testing. After the first batch of finished garments is produced, conduct a complete wash test immediately; only proceed with bulk finishing if shrinkage passes.

· Finishing and packing: Control steam humidity during ironing, avoid excessive pulling; ensure garments are completely cooled and dried before packing to prevent "inventory shrinkage" due to residual heat and moisture.

With this closed-loop management, the risk of shrinkage in mass production can be minimized.

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