01 Spider web or edge loss
Due to improper winding tension, excessive axial movement of the bobbin and spindle tube, poor operation, damage to the grooves at both ends of the drum, etc. The reason is that the yarns at both ends of the package, especially the big end of the package, may slip off intermittently or continuously. In severe cases, a spider web package may be formed. Such defects will cause severe yarn breakage during unwinding.
02 Overlapping stems
Due to the malfunction of the anti-overlapping function, the slot Due to reasons such as damage to the bobbin groove or roughness and obstruction of the yarn channel, the yarns on the surface of the bobbin overlap and stem, forming an overlapping bobbin. Overlapping yarn strips are subject to excessive wear, are prone to end breakage, and are difficult to unwind.
03 Irregular shape
When the intersection of the groove and the groove When the yarn is very rough, clogged with flowers on the clearing board, or the tension device is not in the correct position, the yarn guide stroke becomes smaller, forming a gourd bobbin; poor operation, incorrect bobbin position, resulting in a towed bobbin; failure of the automatic stop mechanism for end breakage, resulting in a convex ring bobbin. ; The winding tension is too high, or the position of the spindle tube is incorrect, resulting in a bell-shaped bobbin; on the winding machine driven by the spindle shaft, due to the wear of the turning point of the forming cam, or the position of the forming cam and the spindle has moved, the two ends of the bobbin will bulge or embedded.
04 Loose bobbin and tight bobbin
Process settings of tension device Improper or improper pressure compensation of the bobbin bracket causes the tension to be too high or too low. The former results in tight bobbins, while the latter results in loose bobbins; there are flying flowers or debris embedded in the tension plate, and the relative humidity in the workshop is too low, resulting in winding. Loose bobbins with too low density will have poor yarn loop stability and will cause de-looping when unwinding the yarn.
05 Large and small bobbins
The operator’s incorrect judgment often results in large and small bobbins, which affects the downstream processes. The production efficiency of the process and the bobbin yarn are also increased. This defect can be overcome by using a bobbin winding and length-fixing device.
Causes of internal defects in winding yarn
1. Poor splicing
Poor splicing by the splicer; irregular splicing operation during winding breakage, resulting in substandard splicing shape and yarn tail length, such as long and short Knotting, unknotting, looping knots, etc. These defective joints will re-unravel in subsequent production processes, resulting in breakage.
2. Attachment of flying yarn waste
Electronic yarn clearer Malfunction; the yarn catcher is clogged, and the yarn waste is brought in from the suction nozzle; when there are flying flowers, yarn waste, or careless operation on the yarn channel, it will cause the flying flowers and silk waste to be rolled into the package together with the yarn.
3. Too many joints
The sensitivity of the electronic yarn clearer is set too high or the knot inspection is adjusted improper.
4. Mixed raw materials and wrong batches
Due to poor production management, different linear densities Yarns of different batch numbers and even different colors are mixed and wound on the same bobbin or batch. In the subsequent processing steps, this kind of defective tube is difficult to find, and finally “wrong warp” and “wrong weft” defects appear on the surface of the finished product.
5. Yarn wear
The auto-stop device for end breakage fails and the machine does not turn off after end breakage. Or there are burrs on the surface of the drum (drum), which will cause excessive wear of the yarn, increase the hairiness of the yarn body, and reduce the strength of the single yarn.
The inherent defects of the bobbin include double yarn, oil stains, lapped ends, etc.
The high degree of automation of the automatic winding machine eliminates the dependence on human factors for high quality and high production of winding to a large extent. The product quality assurance system formed by perfect winding technology and strengthened winding production management enables the above-mentioned bobbin appearance defects and internal defects to be avoided. </p
