Reasons for appearance defects of winding yarn

1. Spider web or selvage

Due to improper winding tension, excessive axial transverse movement of bobbin and spindle tube, poor operation, groove damage at both ends of the grooved barrel and other reasons, the yarn at both ends of the bobbin, especially at the large end of the bobbin, breaks or continuously slips, and the serious cases form cobweb bobbin. Such defects will cause serious yarn breakage when unwinding.

2. Overlapping and stemming

Due to the failure of the anti-stack function, the damage of the grooved drum groove or the rough and blocked yarn channel, the yarn on the bobbin surface is overlapped and blocked, forming overlapping bobbin. The yarn with overlapping and stemming is subject to excessive wear, which is easy to break and difficult to unwind.

3. Irregular shape

When the groove intersection of the grooved drum is very rough, the floral clothes on the clearing board are blocked, and the tension device is not in the right position, the yarn guide travel becomes smaller, forming a gourd package; Poor operation and incorrect position of bobbin cause Baotou bobbin; If the broken head self-stop mechanism fails, the convex ring bobbin will be formed; The winding tension is too large, or the position of the spindle tube is not correct, forming a bell-shaped bobbin; On the winding machine driven by spindle shaft, due to the wear of the turning point of the forming cam, or the movement of the forming cam and the spindle position, the two ends of the bobbin are raised or embedded.

4. Loose and tight packages

Improper process setting of the tension device or improper pressure compensation of the bobbin bracket make the tension too large or too small. The former causes tight bobbin and the latter is loose bobbin; There are flying flowers or sundries embedded in the tension disc, and the relative humidity of the workshop is too low, resulting in the formation of loose packages with low winding density. The stability of the yarn loop is very poor, and the unwinding of the yarn will occur.

5. Large and small bobbins

The incorrect judgment of the operator often results in large and small packages, which affects the production efficiency of the next process, and increases the yarn at the foot of the package. This defect can be overcome by using bobbin winding and length fixing device.

Causes of inner defects of winding yarn

1. Poor connector

Poor splicing of splicer; When the winding ends are broken, the joint operation is not standardized, resulting in non-standard joint shape and yarn tail length, such as long and short knots, knot shedding, loop knots, etc. These poor joints will be loose again in the next production process, resulting in broken ends.

2. Flying flowers and silk are attached

Electronic yarn cleaner failure; The yarn catcher is blocked, and the suction nozzle return wire is brought in; When there are flying flowers, spinning back on the yarn channel or the operation is not careful, it will cause flying flowers and spinning back to be involved in the package with the yarn.

3. Too many connectors

The sensitivity of the electronic yarn cleaner is set too high or the knot checking adjustment is improper.

4. Mixed raw materials, wrong materials and wrong batches

Due to poor production management, yarns of different linear density, different batch numbers and even different colors are mixed and wound on the same package or batch. In the next processing process, this kind of defective cylinder is difficult to be found, and finally there are "wrong warp" and "wrong weft" defects on the surface of the finished product.

5. Yarn abrasion

The failure of the automatic stop device of the broken end, the non-closing of the broken end or the burr on the surface of the grooved drum (drum) will cause excessive wear of the yarn, increase of the hairiness of the yarn body and decrease of the single yarn strength.

The inner defects of the package include double yarn, oil stain, lap, etc.

The high degree of automation of automatic winder largely eliminates the dependence of high quality and high yield of winder on human factors. The product quality assurance system formed by perfect winding technology and strengthened winding production management can avoid the above package appearance defects and internal defects.