The reasons for the formation of the curved belt of the buttonhole webbing:
1. The reed is worn unevenly. 2. The pan head is not drawn evenly. 3. The position of the reed is incorrect. 4. The yarn joining method is incorrect.
Precautions for buttonhole webbing:
1. The wearing method of the reed must be worn according to the regular method, 1 group or 2 groups of wearing method.
2. Pull off the larger and looser side until it is as flat as the other side or 1-5 circles less.
3. The distance between the reed and the knitting needle is generally as long as there is an empty distance between the reed.
4. According to the needs of the webbing, it is divided into upper and lower layers, or divided, left and right. Generally, it should be divided into upper and lower layers. If there are more than two methods or patterns on one belt, it should be connected separately.

Causes of wavy formation of buttonhole webbing:
1. The reed is unevenly threaded, too much yarn is worn on both sides, and too little in the middle. 2. The reed is too large and the weft is pulled too tightly. 3. The yarn of the pan head is uneven, the two sides are pulled tightly, and the middle is too loose. 4. The yarn splicing method is wrong, and the balance of the falling pressure is not good.
Buttonhole webbing measures to prevent waves:
1. Use standard reeds and wear them in 1 or 2 groups.
2. According to the width of the webbing, choose a reed to wear it.
3. Swap a few yarns in the middle and on both sides, or pull down the looser ones in the middle.
4. According to the method of webbing, it needs to be connected, and the pressing weight is averaged according to the number of strips.