The fabric itself has a great influence on the sewing condition. For example, some finely organized fabrics, post-finished fabrics, and thin, non-stretchable fabrics. When the direction of the sewing is parallel to the warp direction of the fabrics, the embedded stitches will force the warp yarns out of position, as the stitches are pushed away by each stitch, and the deviation caused by the accumulation of multiple stitches will follow the seam. The cloth body shrinks and causes the seam to wrinkle, and when the direction of the sewing is parallel to the latitudinal direction of the cloth, it is usually less wrinkled.
According to experience, the seams in the diagonal direction will not wrinkle. Most fabrics, as long as the seam is at a 15 degree angle of the longitude or latitude, is enough to avoid wrinkles. Therefore, you can consider using the oblique cut method. If necessary, apply a smoothing agent to the fabric. In addition, fine needles should be used whenever possible. Because the fine needle can significantly reduce the resistance generated when passing through the fabric, it has the effect of preventing the seam from wrinkling, and at the same time pay attention to the frequent replacement of the new needle.
When using synthetic sewing threads, care must be taken to determine the tension of the suture and the tension should be adjusted to a minimum. The bottom thread tension must be adjusted to: When the end of the freely movable stitch is pulled up, the bobbin bobbin and the outer sleeve are slowly slid downward, and the tension between the upper thread and the lower thread must be the same so that they are interlaced between the two layers of fabric. The tension of the synthetic sewing thread sewn into the fabric is too large and will automatically shrink to relieve the tension, which will cause the cloth body along the seam to shrink and the seam to wrinkle.
It should also be noted 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 more quickly and the seam is wrinkled. As long as the pressure of the presser foot is lowered as much as possible, and the feeding teeth (conveyor) of the fine teeth are used at the same time, the rotation speed of the sewing machine can be reduced to avoid wrinkles caused by the feeding, and the fundamental method for completely solving the problem is to have Sewing machine for differential feeding or needle feeding mechanism.
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