Zigzag sewing machine -- Beautiful stitches are inseparable from the needle

Thick-threaded zigzag sewing machines are mainly used for sewing thick materials, such as shoes, leather products, sofa seat covers, and hats. For beautiful, neat, and smooth sewing, it is also important to select a sewing line when sewing. High-quality sewing threads must have stitching, durability, and aesthetic appearance.

◆Suture.

It refers to that when the sewing thread is sewed on the specified sewing material and at the highest sewing speed under normal operating of zigzag sewing machines, it can sew uniform stitches, which are uniform, smooth, elastic, and flexible.

◆Durability.

It refers to the stress characteristics of sewing thread in sewing operation and its durability in online sewing, that is, the strength of the thread.

◆Appearance.

It refers to the appearance of the suture before sewing, especially after sewing, the matching effect on the fabric, the coordination effect of neat stitches and colors.

In addition, the thickness of the sewing thread must match the specification of the vibration excitation. If the sewing thread is too thin and the needle is too thick, the sewing thread will not fill the needle hole, resulting in a very indecent appearance of the stitch, On the other hand, the suture is too thick. Although it can fill the pinhole, the tension to tighten the stitch during thick suture sewing is relatively large, resulting in the fracture of the suture, When the stitches are not completely broken, they may be severely rubbed, resulting in the irregular arrangement of stitches. Therefore, the thickness of the suture should be selected according to the needle number of the machine needle, or the appropriate needle number of the machine needle should be selected according to the pull of the suture. The general selection rule is that the diameter of the suture should be less than the width of the pinhole, it is appropriate not to exceed 80% of the width of the pinhole so that the suture can pass through the pinhole freely.