Causes of frequent monofilament horizontal strips in knitted fabrics and preventive rectification measures
Sep 10, 2021
Monofilament horizontal stripes refer to the phenomenon that one or several courses on the surface of the fabric are too large or too small and unevenly dense compared to other courses. Monofilament horizontal strips caused by raw materials are the most common in actual production.
cause
A. The yarn quality is poor and the monofilament has chromatic aberration, such as tightly twisted silk, different batches of chemical fiber filaments, different color filaments or different yarn counts, which directly lead to the production of monofilament horizontal stripes.
B. The big difference in the size of the yarn bobbin or the shoulders and sags in the forming of the silk cake itself will cause uneven yarn unwinding tension and easy to produce monofilament horizontal stripes. This is because the difference in the size of the yarn bobbin will cause the winding point and the diameter of the unwinding balloon to be different, and there will inevitably be greater differences in the changing law of the anti-burning tension. In the knitting process, when the tension difference reaches the maximum value, it is easy to cause the yarn feeding amount to be different, resulting in uneven loop size.
C. When processing porous and ultra-fine denier materials, the silk path should be as smooth as possible. A certain guide hook has a little roughness or solidification of grease stains, which can easily cause multiple filaments of the raw material to break, and the color difference of the filaments will also occur. Compared with processing with conventional raw materials, it has more stringent requirements on equipment, and it is easier to produce monofilament horizontal stripes in fabric.
D. The machine is not adjusted properly, and the needle triangle is too deep or too shallow in a certain place, which makes the yarn tension abnormal and the size of the loop formed is different.
Preventive rectification measures
A. To ensure the quality of raw materials, use famous brand raw materials as much as possible. The dyeing of raw materials and physical index changes are strictly required. The dyeing standard is above 4.0, and the coefficient of variation of physical indexes should be small.
B. It is best to select fixed-weight silk cakes for processing. For fixed-weight silk cakes, select silk cakes with the same package diameter and use them on the machine. It is found that there are poor appearances. If there are shoulders and sags, they must be discarded. When dyeing and finishing, it is best to follow the dye sample. If horizontal stripes appear, choose to dye non-sensitive colors or add horizontal stripes treatment agent to eliminate or lighten the stripes.
C. When processing porous and ultra-fine denier raw materials, the appearance of the raw materials must be strictly checked. In addition, it is best to clean the silk path and check whether each guide wire structure is smooth. During the production process, observe whether there is tangled wool in the weft feeder. If found, stop immediately to find the cause.
D. Ensure that the depth of the pressure gauge triangles of each yarn feeding path is the same. Use a yarn length gauge to finely adjust the bending position of each triangle to keep the yarn feeding amount consistent. In addition, check whether the yarn bending triangles of each road are worn or not. The adjustment of the yarn bending triangle directly affects the size of the yarn supply tension, and the yarn supply tension directly affects the size of the loop formed.
