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The efficiency reduction caused by yarn clearing should be kept to a minimum

Update:24-06-2020
Summary:

Improving the operation efficiency of the automatic win […]

Improving the operation efficiency of the automatic winder is a comprehensive indicator to measure whether to use the automatic winder scientifically. It can objectively reflect the quality of the bobbin, whether the process parameters are reasonable, whether the worker's operation method is correct, and whether the equipment maintenance work is in place. At present, in the use of enterprise automatic winders, due to the gaps in the above aspects of work, there is a big gap in operating efficiency. The production efficiency of well-used enterprise equipment reaches more than 90%, and the average enterprise is 80%~ Between 85%, a few enterprises are only 70% or lower, and the difference between the production efficiency of advanced and backward enterprises is about 20%. Therefore, to use automatic winder scientifically, we must first grasp the important link to improve the production efficiency of equipment. Generally, the production efficiency of automatic winder should reach more than 85%. How to achieve this goal? According to the experience of many enterprises, the following tasks should be done.

 

Improve bobbin quality and increase bobbin capacity

 

The bobbin yarn has fewer defects and is well formed. When the automatic winder is unwound, it can reduce the decoiling, reduce the broken ends, and improve the operation rate. At the same time, appropriately increasing the capacity of the bobbin at a certain spindle speed of the spun yarn, reducing the number of knotting knots during winding, is also a measure to improve the operating efficiency of the equipment. At present, some cotton spinning mills increase the diameter of the ring from 38 mm to 42 mm when spinning 14.5 tex to 9.7 tex yarns, and the bobbin capacity can be increased by 25% to 30%. Each bobbin can reduce the number of knots 6 or more.

 

Reasonable setting and optimization of yarn clearing curve

 

Production practice shows that 80% to 90% of the yarn defects are class A and B short chunky yarn defects from the analysis of electric clear cutting yarn defects. The short chunky yarn defects are set strictly and loosely, which determines the number of shears per 10,000 meters. . Tests have confirmed that the shear rate per 10,000 meters is between 6 and 7 times, and the operating rate of a single spindle can reach 85% to 86.5%. When the shear rate per 10,000 meters is increased to 7.5 to 8 times/hour, the operating rate of a single spindle will drop by about 2.0% . Therefore, the setting of electronic clearing process parameters should meet the following three principles: first, harmful yarn defects or foreign fibers are detected and removed; second, there are few or no harmless yarn defects or foreign fibers are mistakenly cut and removed; third, due to The efficiency reduction caused by yarn clearing should be kept to a minimum. In addition, when using the foreign fiber function electronic yarn clearer, a foreign fiber detection device must be installed in the cotton opening and clearing process to detect most foreign fibers to reduce the number of foreign fiber shears on the automatic winder. Some factories have conducted many tests. After installing the foreign fiber sorting device in the opening and cleaning process, the number of cutting defects on the automatic winder can be reduced by 55% to 60%, which significantly improves the production efficiency. For many raw cottons, it is undesirable to rely solely on electric clearance.

 

 

Strengthen the training of gear mechanics and correctly implement the operation method

 

Due to the high technical content of the automatic winder and the fast running speed, the shifters must be familiar with the performance of the machine and correctly understand the operating essentials of each component. Therefore, the shifters must undergo more than 20 hours of training before taking up the job. Some factories have done analysis and determination, the length of training for operators, and the level of proficiency in operations have a greater impact on production efficiency. For example, one worker who has been trained for more than 20 hours and the working time is more than 6 months is blocked. Due to the decrease in skilled operation, the equipment operation efficiency has reached more than 85%, while the other has been rushed to work after 6 hours of training and the equipment has been running for 2 consecutive months The efficiency is only 78%, and the difference between the two is 7%, so the training of gear mechanics cannot be ignored.

 

Do a good job of temperature and humidity control and adjustment in the winding workshop

 

Due to the use of air splicing and electronic yarn clearing technology, the automatic winder has stricter requirements on the temperature and humidity of the workshop than the ordinary winder. If the relative humidity in the workshop is too low, the yarn channel becomes astringent and the cohesion decreases, which will not only increase hairiness, And will produce sudden yarn defects. Therefore, in addition to controlling the spinning process, especially the two moisture regain control points for cotton rolls and rovings, a certain number of air changes and proper temperature and humidity conditions should be maintained during the winding process, and the temperature should be controlled at 22 ℃ ~ 30 ℃. The relative humidity is controlled within the range of 62% to 72%. Especially the capacitive electronic yarn clearer is more sensitive to temperature and humidity changes. Improper control will increase the yarn breakage and miscutting, which affects the production efficiency. Therefore, the understanding that there is no need to install air conditioning equipment in the winding workshop is incomplete.

 

Reasonably control the running speed of automatic winder

 

The speed of the automatic winder is high and the output is high, but it will increase the hairiness to a certain extent. Must pass the test, on the basis of the maintenance work of the key components of the yarn channel, control the hairiness to the lowest premise, appropriately increase the speed of the winding, and maximize the production efficiency of the automatic winder.

 

https://www.dkyarn.com/

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