Woven Fabric Greige Sett Effects on Finishing Shrinkage Rates
Greige sett density determines yarn mobility and crimp capacity, directly establishing wet processing shrinkage and final finishing compaction limits.
Stenter Overfeed Rate
Feed Control
Adjustment of the speed at which fabric enters a drying oven relative to the speed of the transport chain controls the final density of the material. By setting a specific stenter overfeed rate, the operator pushes more length into the machine than the chain pulls out. This allows the fabric to relax and shrink in the warp direction before the heat sets the fibers.
Density Adjustment
Increasing the amount of fabric fed into the machine raises the weight per square meter. This technique is commonly used to meet the target grams per square meter for knitted fabrics. Without this adjustment, the material would be too thin and unstable.
Performance Outcome
Garment manufacturers rely on this process to minimize the residual shrinkage of the finished product. A high stenter overfeed rate creates a fabric that stays dimensionally stable through domestic laundering. If the rate is set too low, the fabric is stretched tight and will snap back the first time it is wetted.
This leads to customer complaints about shrinking shirts or trousers. Engineers calculate the required rate by comparing the grey width of the fabric to the finished width. Monitoring the tension across the pins prevents the edges from tearing during high-speed processing.
Operational Boundary
Mechanical limits of the machine pins and the drying capacity of the oven restrict the maximum possible overfeed. If the fabric is too bunched, it will not dry evenly in the center. Consistent overfeed remains the standard for quality finishing.