Seam Stability
Standard test methods that measure the resistance of woven yarns to sliding along a sewn seam determine the durability of garments. The testing standard seam slippage iso 13936-2 applies a specific force to a sewn specimen and measures the resulting opening at the seam. This test prevents the purchase of loose-structure fabrics that would pull apart at the seams during normal wear.
Load Application
Universal tensile testers stretch the specimen perpendicular to the sewn seam up to a specified force. Under the seam slippage iso 13936-2 protocol, this force is typically sixty Newtons for apparel or one hundred Newtons for upholstery fabrics. This mechanical stress simulates the pressure applied when sitting or stretching.
Displacement Measurement
Distance meters calculate the width of the gap between the yarns after force removal. The seam slippage iso 13936-2 method requires that the seam opening be recorded in millimeters. A larger gap indicates that yarns are easily displaced.
Fabric Correction
Low resistance to yarn sliding often requires weavers to increase the pick density or change the weave structure of the fabric. In garment manufacturing, if a fabric fails the seam slippage iso 13936-2 test, technicians increase the seam allowance or use a stronger seam type. These adjustments prevent the failure of completed garments in the hands of consumers and protect the apparel brand from costly claims.
