What is the strength and performance of polyester sewing thread?

1) Strength of sewing thread yarn

The breaking strength of the fiber is improved. Although the slippage length increases and the number of slippage fibers in the yarn cross-section increases relatively, the total strength of the broken fibers will be greatly improved. Therefore, the higher the breaking strength of the fiber, the higher the yarn strength.

2) Friction properties of sewing thread yarn

When the fiber surface friction coefficient u increases, the sliding resistance between fibers increases, the slippage length Lc decreases, the proportion of slippage fibers decreases, and the yarn strength increases. Increasing the crimp number of fibers can increase the sliding resistance between fibers, which is not only conducive to the smooth spinning process, but also conducive to the improvement of yarn strength.