First of all, before sewing clothes, the cloth should be soaked in water to prevent it from going out of shape when wearing or washing. Alternatively, the cloth can be pulped in rice soup or noodle soup to increase the expected hardness. However, it should be noted that after sewing, it should be fully soaked, washed with water, and the size on the cloth should be cleaned. No.9 needle should be used for sewing, the needle spacing should not be too close, generally 4~5 needles per cm, and the edge should be relaxed, preferably not less than 1 cm.
If synthetic thread is used, the sewing tension of sewing machine must be carefully determined, the tension should be adjusted to the minimum, and the bottom thread tension must be adjusted. When the bottom thread is pulled up on the free section of the gap, the mandrel and the sheath slide down slowly, and the tension between the top thread and the bottom thread must be consistent, so that they can be interwoven between the two layers of cloth. And Cheng Xian's house will shrink automatically if the tension is too high. Once this tension is relaxed, this phenomenon will make the cloth shrink along the depth of the seam, and then wrinkle the seam.
Reducing the pressure of presser foot as much as possible can avoid wrinkling caused by feeding.