The winding machine has the advantages of high speed, high output, high efficiency and no joints. It can reduce labor and increase the economic benefits of the enterprise, so it is widely used. Now we will discuss how the high-speed automatic winding machine controls the occurrence of defects in the production process of coarse yarn, how to configure the process, and how to maintain the equipment.
Measures to control hairiness growth
01 Reasonably control the relationship between winding speed and winding tension
The winding speed and winding tension are directly proportional to the growth of hairiness. As the winding speed and winding tension increase, the friction factor between the yarn and the tension disc increases, causing an increase in hairiness. During the practice, we systematically optimized the winding speed and winding tension to achieve the ideal effect of high-speed operation with little increase in hairiness.
02 Maintain the yarn channel
The surface roughness of the yarn channel and the tension disk will directly Influence on the increase of hairiness:
1) In practice, thorough cleaning of the yarn control ring and yarn guide tiles will reduce the growth of hairiness by 20%.
2) Preventive inspection of the damage of the yarn guide tiles and the wear of the tension plate every day will better prevent the sudden growth of yarn hairiness.
3) Further reduce the impact of the tension mechanism on yarn hairiness. The commonly used tension disks are duralumin surface hardness polished, which is prone to wear and grooves during use. In response to this situation, we switched to a new tension disk with duraluminum chromium electronic mirror polishing on the steel surface, which not only improves the wear resistance and increases the service life, It can also reduce hairiness and significantly improve the cost performance. In order to completely solve the problems of extending the life of the tension disk and reducing the hairiness of the yarn, it is recommended that the manufacturer use nano-ceramics for the yarn contact surface of the tension disk.
4) In order to prevent the surface of the trough drum from being scratched by the hook knife used by the turner, it is recommended to use special scissors for the trough drum to clean the trough drum winding yarn. If the groove barrel is scratched, the hairiness will increase by more than 100%.
03 Improve the quality of raw yarn
1) The influence of raw cotton performance on hairiness Influence: The length, maturity, linear density, fiber strength, etc. of the fiber in the raw material affect the hairiness of the yarn.
2) The influence of roving twist on hairiness: No matter what kind of raw material, the hairiness of the yarn decreases with the increase of the yarn twist. Therefore, it is necessary to ensure the drafting requirements of the spinning yarn and the yarn In the case of evenness, a larger roving twist should be configured to help strengthen the control of the fibers and reduce the degree of fiber dispersion, so that the heads and tails of the fibers cannot easily protrude from the main surface of the yarn sliver, thus reducing the hairiness of the yarn.
3) The influence of spun yarn traveler and steel ring on hairiness:
① The number of the traveler has a great influence on hairiness, and the traveler is too light If the ring is large, there will be many broken ends and the hairiness will increase; if the traveler is too heavy and the tension will increase, the traveler will easily wear the shaved yarn and the hairiness will also increase.
② The size of the wire loop has an impact on hairiness. You should first use a larger loop to increase the yarn channel space to reduce hairiness.
③ The cross-sectional shape of the wire ring has a great influence on hairiness. Choosing a wire ring with a large rectangular cross-sectional area and stable operation is beneficial to the reduction of hairiness.
④ Travelers with different surface treatments can reduce yarn hairiness by 15% to 20%, and the performance of nano-magnetized travelers is particularly obvious.
⑤ The size of the steel ring has a great influence on hairiness. When the diameter of the steel ring reaches 10, the linear speed of the traveler is large and the friction is large. At the same time, the spinning tension increases, and the traveler runs unstable and heat dissipation Difficulty, thus increasing hairiness.
⑥ In practice, it is found that the circular diameter steel ring and the steel ring with wide sides have less hairiness than the narrow side steel rings. The main reason is that the yarn channel is wide and the traveler is stable and easy to dissipate heat.
⑦ The use of steel rings has a maturing period, a stable period, and a decline period just like the wire ring. Doing a good job in the maturation period of the steel ring will directly affect the hairiness of the steel ring in the stable period. If possible, the ring oil must be used before the new ring is put on the car during the running-in period to prevent hairiness due to violation of operating procedures.
⑧ Steel rings with different surface treatments have completely different hairiness and service life. Electroplated steel rings have 10% less hairiness and 80% longer service life than ordinary steel rings. Therefore, textile mills generally use cost-effective electroplated steel rings.
4) Reasonable matching and selection of steel rings and travelers: Reasonable matching and selection of steel rings and travelers is directly related to hairiness. But it is even more important to strictly control the service life of steel rings and wire rings. They should be replaced in time at the upper limit of the decline period. Some important varieties such as slub yarn, elastic yarn, etc. need to shorten the cycle. Generally, the cycle of electroplated steel rings is 7 to 8 months. The lead time for electroplated steel wire rings is 5 to 7 days.
04 Reduce the number of rewinds
Rewind on the winding machine The number of times is directly proportional to the growth of hairiness. The more times of rewinding, the more opportunities there are for hairiness to increase. The main reason is that during repeated rewinding of the yarn, the number of scrapes between the yarn and the channel surface increases, the direction of the hairiness and the strength of the yarn are affected, and some hairiness changes from short to long. In production, it is also necessary to ensure the success rate of one-time knotting, reduce the backlash of knotted yarns, and the backlash of doubling and broken bobbins. When necessary, measures such as reducing the vehicle speed must be adopted to deal with it.
05 Reasonable temperature and humidity
The workshop temperature is too high and relatively The humidity is lower and the amount of yarn hairiness increases. The relative humidity in the spinning process is controlled at about 60%, and the relative humidity in the winding process is controlled at about 75%, which is beneficial to reducing hairiness.
Control of winding air twist joint strength
01 Compressed air quality
The compressed air pressure is 0.7 MPa, the ambient temperature is 25 ℃, and the oil content is less than 0.07 g/m3. Insufficient pressure of the compressed air will lead to insufficient untwisting. After untwisting, the fibers cannot be arranged into single fibers in a brush shape. During splicing, the overlapping parts of the two ends in the twisting area cannot be fully twisted together, resulting in insufficient strength. At the same time, pressure fluctuations will occur due to insufficient compressed air flow. Pressure fluctuations will occur on the winding air compressor table due to multiple spindles being knotted at the same time. This is mainly due to insufficient flow and needs to be checked. After it is completely resolved, normal production can be resumed. If the flow rate is insufficient, the strength and stability of the joint will be affected. Generally affecting the flow rate are insufficient air supply from the air compressor, clogged compressed air filter, and excessive air consumption.
02 Winding and knotting process parameters
1 Choose the appropriate ones The untwisting time is the key to ensuring strength. If the untwisting time is too long, fiber breakage and unknotted fiber areas will occur. If the untwisting time is too short, the untwisting will be insufficient.
2) The selection of twisting time also needs to be appropriate.
3) When selecting the pressure of compressed air, the untwisting pressure should be greater than the twisting pressure. When the yarn twist is high and the yarn is thick, the pressure should increase, but generally it should not exceed 0.7 MPa.
4) The length of the lap must be appropriate, otherwise it will affect the shape and size of the joint. For coarse yarns above 58.3 tex, wet twisting must be used. Wet twisting can increase the joint strength by about 60%, but the actual measured strength is still based on the dried joint.
5) Select appropriate twisting cavity and untwisting tube.
03 Effect of operation on joint strength
1) It is particularly important to clean the splicing parts of the knotting area to reduce the impact of wet floral clothing on the reliability of the knotting action.
2) Prevent manual simultaneous splicing (collective can change, start-up, spinning yarn quality is not up to standard).
04 Strengthen equipment maintenance and inspection
1) Do a good job in cleaning and maintenance of knotting scissors and scissor pressure plates to keep their movements sensitive and reliable.
2) Strengthen the inspection and maintenance of the front end of the untwisting tube. Since the untwisting front end of our company’s winding machine is glued, degumming is easy to occur during use. This causes the front end to fall off and become loose, affecting the strength of the joint.
In short, when the winding machine produces coarse yarn, the most common defects are increased hairiness and joint detachment, which can be effectively solved through the above measures. , to prevent the occurrence of defects. </p
