Edge Retention
Resistance offered by the fabric border as it is held by the needles of a stenter frame prevents the material from narrowing during drying or heat setting. This mechanical load, termed selvedge pinning force, is generated by the lateral tension applied to the cloth to reach its target width. It must be carefully balanced to ensure the fabric stays flat without tearing at the edges.
Pin Engagement
The physical condition of the stenter pins and the density of the fabric weave determine how much load can be supported. High levels of selvedge pinning force are required for heavy denim or canvas, while lightweight knits require a much gentler grip. If the force exceeds the strength of the yarns at the edge, the pins will pull through the material and cause a failure of the web.
This rupture can stop the entire finishing line and result in significant production delays.
Width Uniformity
Maintaining a constant tension across the entire length of the roll is essential for consistent fabric width. Variations in the selvedge pinning force can lead to wavy edges or uneven gsm across the width of the finished cloth.
Waste Minimization
Engineers monitor this tension to prevent excessive damage to the selvedge area. Efficient management of the selvedge pinning force allows the manufacturer to minimize the amount of fabric that must be trimmed away before the goods are sent to the garment factory.
