How domestic winding machines reduce yarn hairiness
How Domestic Winding Machines Reduce Yarn Hairiness
Yarn hairiness is formed when fiber bundles are twisted in the twisting triangle formed under the action of steel rings and travelers after they are led from the front roller of the spinning frame. A lot of hairiness can also be produced when winding yarn on the winding machine. Yarn hairiness does not pose a big threat to the weaving of shuttle looms, because shuttle looms use shuttles for weft insertion. Even if there is hairiness on the yarn, it will not affect the normal flight of the shuttle, or even cause weft insertion failure. The weft stop of the loom.
According to survey statistics, 75% of the weft stops of air-jet looms are related to the hairiness of warp yarns. Hairiness on the weft yarn will not only cause unclear opening of the loom and make weft insertion difficult, but will also cause weaving defects that affect product quality. The hairiness on the yarn will fall off due to friction during processing in various downstream processes, causing flying flowers to pollute the production environment and endanger human health. It will also produce new defects and reduce the quality of yarn and fabrics. Therefore, how to reduce hairiness on yarn has attracted great attention.
At present, the 1332 type trough-type winding machine, which is widely used by cotton textile enterprises in my country, has a simple structure, is easy to use, consumes less electricity, and has low cost of use. However, since the winding part of this machine uses bakelite troughs, there are problems such as serious static electricity and uneven yarn passages, which makes the hairiness of the yarn after winding much more than that of the yarn wound on the high-speed automatic winding machine. This is one of the main reasons why the package yarn produced by the domestic 1332 type winder does not meet the production requirements of the air-jet loom. So, how to reduce hairiness on the 1332 grooved drum winder?
1 Reduce hairiness by adjusting the process. Winding process parameters: such as the weight of the tension disk, the spacing of the yarn clearing plate, the size of the yarn guide distance, etc., if not adjusted properly, will have an impact on hairiness. When adjusting these parameters, be sure to adjust their size according to the winding number, otherwise the hairiness on the yarn will increase.
2 Reduce hairiness by strengthening equipment maintenance. The parts of the yarn passage part on the machine, such as the edges and corners of the yarn guide groove of the winding drum, the surface of the yarn guide rod, the balloon break, and the yarn guide magnetic plate must be smooth and clean.
3 Reduce hairiness by adopting appropriate winding speed. Under the possible conditions, a lower winding speed should be appropriately selected to reduce the winding tension. This is one of the methods to reduce yarn hairiness.
4. Reduce the number of windings as much as possible. After the yarn is wound, the hairiness increases, and the CV% value of the hairiness distribution decreases. The more times the yarn is wound, the more the hairiness increases. therefore. During production, the number of winding times should be minimized and the rewinding of the package yarn should be minimized.
5. The glue drum used on the 1332 type winding machine will generate static electricity when the yarn is rubbed, which will increase the hairiness of the yarn, especially when processing coarse yarns and chemical fiber blended yarns. The hairiness is more serious. Therefore, it is necessary to consider changing the bakelite trough to a metal trough during equipment modification to reduce the generation of hairiness.
6. Installing a balloon controller on the 1332 winding machine is currently an important measure to reduce hairiness of the winding machine. Through production practice, it has been shown that the winding machine without a balloon controller has more than 2 times more spun yarn hairiness after winding than before winding, while the winding hairiness is significantly reduced after the balloon controller is installed. Even if the winding speed increases after installing the balloon controller, the hairiness will be reduced.
7 Hairiness can also occur when the yarns rub against each other. Therefore, the friction between the bobbin yarn dropped from the spinning machine or the wrapped cone yarn during the unwinding, transportation, and storage processes will also produce hairiness. To reduce this part of hairiness. The automatic production line of fine droplets can be used to transport the bobbin with a nail plate or a conveyor belt to reduce friction and collision between the bobbin and the bobbin and between the bobbin and the bobbin.
The reasons why the automatic winding machine has a lot of yarn waste:
1. The performance of the machine is relatively poor and there are many broken ends;
2. The rotation of the groove drum ends is too long. Large;
3. The sensitivity of the electric clearer is too high, and the miscut rate is high;
4. The negative pressure is too large or too small, such as higher than 6, 5, or lower than 4, 0 PA;
5. The success rate of knotting is low.
Previously, the vast majority of winders used in my country’s textile industry were domestically produced 1332M grooved drum winders, with a number of about 30,000 units. There are currently two methods for technological upgrading and transformation of winders:
First, all are updated to advanced automatic winding machines;
The second is to carry out technical transformation with advanced applicable technologies.
Comparing the two methods, the former will cost a lot, and it will cost about US$185,000 to introduce an automatic winding machine; while the latter only costs more than RMB 100,000 for technical transformation per unit. is more practical.
Therefore, for most textile enterprises in my country, it is advisable to adopt the second method, which is also in line with the actual situation of the enterprise and my country’s national conditions.
1. Electronic yarn clearer
The electronic yarn clearer uses the principle of photoelectricity or capacitance to detect and remove impurities in the yarn. Use it to replace the currently used plate-type and comb-type yarn clearers. It can not only remove impurities from the yarn, but also remove harmful defects such as thick details of the yarn to improve the quality of the yarn. How the electronic yarn clearer detects yarn is explained below, taking the photoelectric electronic yarn clearer as an example: when the defects on the yarn pass through the yarn clearer detection head, the photoelectric receiver can sense the image of the yarn thickness. After amplifying enough electrical signals, the thickness and length of the yarn defect are identified through the identification circuit. When the diameter and length of the yarn defect exceed the set value,The effect is more obvious and the bobbin will be better formed, so it is very popular among turners.
e) After carrying out 9 supporting technical transformations on the domestic 1332 type winding machine, the quality of the package yarn is close to that produced by the imported model. It can be used to process high-grade and export yarns, and the package yarn can be directly used for new high-speed warping. Used on looms and shuttleless looms,
At present, my country has developed and produced a new type of GA014MD-W winding machine, which is based on the 1332M type winding machine:
H800 series electronic cleaning machine It is a new model composed of advanced technologies such as yarn monitoring device and length-fixing device, FG series air splicer, metal groove drum, spherical forming device, full drum transport device, SFU type carriage and LF type traveling cleaning device.
Through testing, various technical indicators meet the company’s technical standards:
a) The radial runout of the installation drum is small 0.12mm;
b) The package yarn is well formed;
c) The air splicer joint standard is reliable, the yarn strength percentage at the joint is 87.8%, and the CV value is 9.4%: d) The electronic yarn clearer has high sensitivity and the yarn clearing success rate is 100%; e) The movement of the car is sensitive and reliable;
f) The air volume of the hair dryer is greater than 360m3. Its performance can replace the automatic winding machine, the product quality is close to the quality level of the automatic winding machine imported from abroad, and the cost is 85%-90% lower than the imported model. This type of winding machine is a multi-technical supporting project for winding machines implemented by 5 textile machinery, electromechanical and equipment manufacturers through cross-industry and cross-regional alliances, and is obtained by technological transformation of traditional winding machines. results.
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