The fabric itself has a great influence on the sewing situation. For example, some well-organized fabrics, finished fabrics, and thin, non-stretch fabrics. When the sewing direction is parallel to the warp direction of the fabrics, the embedded stitches force the warp yarns away from the original position, because each stitch will push the warp yarns away, and the bias generated by the multi-needle accumulation will follow the seams. The body of the cloth shrinks to cause creases in the seams, and when the sewing direction is parallel to the weft direction of these fabrics, wrinkles are generally less. According to the experience, diagonal seams in the diagonal corners will not wrinkle. Most fabrics only need to make the seams at a 15 degree angle of latitude or longitude to prevent wrinkling. Therefore, it is conceivable to use oblique cutting operations. If necessary, apply a smoothing agent to the fabric.
In addition, fine needles should be used as much as possible. Since the fine needle can significantly reduce the resistance generated when passing through the fabric, there is an effect of avoiding creases and wrinkles, and it is necessary to pay attention to constantly changing the new needle.
When using a synthetic sewing thread, care must be taken to be certain of the tension of the thread and the tension should be adjusted to a minimum. The tension of the bobbin thread must be adjusted so that when the thread is pulled up from the end of the movement, the bobbin of the bobbin thread and the outer sleeve gradually slide downwards. The tension between the bobbin thread and the bobbin thread must adhere to the divergences so that they stagger between the two layers of fabric. If the synthetic sewing thread is sewn into the fabric with too much tension, it will automatically shrink to relieve this tension. This phenomenon will shrink the body of the cloth along the seam and cause the seam to wrinkle.
Also note that due to the friction between the upper fabric and the presser foot, the lower fabric on the feed dog is also forced to move faster and cause the seam to wrinkle. Just lower the pressure of the presser foot as much as possible, and at the same time, use fine-feeding teeth (producer) to reduce the speed of the sewing machine to prevent wrinkles from being fed, and the basic method for completely dealing with this problem is to adopt Sewing machine with differential feed or needle feed mechanism.