Although the blowing and carding process is short, the holding and striking points are no less than those of traditional blowrooms. Under the condition that the machine has a single function and the cotton pieces are not small enough, strong opening is carried out at small intervals and high speed. Removing impurities will inevitably produce some abnormal phenomena. What problems will arise and how to solve them?
Common problems in blowroom and carding production
01 High card sliver short staple
Through experiments, experience or daily inspection data analysis, it will be found that the A186 carding machine has a short staple growth rate in the carding process (referring to the change value of the carding process from banquet cotton to card sliver short staple). Within 2%, while the short staple growth rate of the blowroom-carding unit is 2% to 4%, and even some manufacturers’ short staple growth rate is more than 6%, and the total amount of waste in the blowroom-carding and carding process is generally relatively high.
02 The noils of Cheduhua have low impurity rate and high usable fiber content
Breaking and carding Most of the rollers are closed. Generally, few people will pay attention to the licker-in waste after installation, debugging or flat car maintenance. The main reason is that it is inconvenient because it is closed and collectively sucks air. The reason is very simple, but this will cause many manufacturers to be unaware of the situation.
03 The cotton roller is prone to twisting
The cotton roller is prone to twisting, which will change the The process distance between the cotton roller and the cotton feeding plate changes the control of the feeding fiber. Since the fibers fed are disordered fibers, especially those fed with cotton, the fiber structures in the transverse and longitudinal directions are quite different. Licker-in combing is a type of holding combing. The holding force comes from the interaction force between the cotton feeding plate and the cotton feeding roller. If the holding force changes, the holding combing effect will also change.
04 Cover flowers contain a large amount of long fibers
For cover flowers, we will It is customary to pay attention to the amount of cover plates. If the amount of cover plates is too much, the production rate will be low, and the cost will be high. Therefore, the amount of cover plates should be strictly controlled. The adjustment method is to adjust the cover plate speed or adjust the exit process distance of the rear upper cover plate. But if we analyze the cover flowers carefully, we will find that there are a large number of long fibers in the innermost layer of the cover flowers, or whether there are combed bundles of cotton fibers in the outermost layer of the cover flowers, especially long-staple cotton and chemical fibers. protrude. If you spend too much on the cover, the cost will increase; if you spend less on the cover, the quality will be poor. Those who lose more and lose less should be treated differently.
05 The cotton web cleaner process never changes
For enterprises with certain technical strength, We will pay more attention to the process of the cotton mesh cleaner and conduct tests and adjustments according to the specific situation. However, for manufacturers with weak technical strength, the attention is poor or very poor. Some companies even have never changed the process from installation to use, nor have they debugged it. No matter how many years they have been used or how many varieties they have changed, other No matter how many times the process has been adjusted, the process of the cotton mesh cleaner has never changed.
06 Flat plate filling
Same raw materials, same technology, flat card clothing models The same, but it is easy to cause congestion at the bottom of the cover card clothing on the blowing and carding unit. The filling is mainly short lint and dust, but there is no such thing on the A186 carding machine.
Solution
01 Air flow control
Different equipment has different design ideas and characteristics. To control the air flow and stabilize the air flow, the most critical thing is to control the thickness of the air boundary layer or the amount of air flow in the carding machine. However, For carding machines, the air flow is difficult to measure and cannot be visually or felt, so the air flow can only be adjusted and controlled through process adjustments.
Control the amount of air flow. The air flow is mainly supplemented through the lick-in roller area, such as the process distance between the lick-in roller and the entrance to the small leakage bottom, followed by filling in the gap between the rear upper cover plate entrance and the cover plate, the front large leakage bottom entrance and the cylinder Fill in the gaps between them.
Control the amount of air flow generated. The high-speed rotation of the cylinder is the main cause of airflow, followed by the rotation of the licker-in. Therefore, the change of cylinder speed must be comprehensively considered. Increasing the cylinder speed has many advantages, such as high speed and high production, but it will also bring disadvantages, such as the increase of airflow. Thickening of air flow surface layer, etc.
Increase the release of airflow. First, we must take advantage of the cotton web cleaner and adjust it by reasonably adjusting the process distance of the cotton web cleaner. Secondly, we must use other suction areas, such as the suction device on the licker-in, the suction device under the large drain, etc. .
Height selection of cylinder card clothing. Under the conditions of the same cylinder speed, the higher the height of the cylinder card clothing, the greater the air flow generated, the greater the density, and the greater the air flow.
02 Reduce the production of lint and increase the elimination of lint
In the carding process , the main production parts of short velvet are in the licker-in, cylinder and cover plate areas, followed by the rear fixed cover plate.
The amount of short lint produced by the licker-in is the largest, mainly because the licker-in carding is holding carding, and the fibers that are carded are disordered bundles and block fibers. Moreover, the carding intensity is high and fiber damage is likely to occur. Therefore, the speed of the lick-in roller and the process spacing of the lick-in roller components must be reasonably selected, especially the process spacing of the cotton feed roller and the cotton feed plate, and the process spacing of the cotton feed plate and the lick-in roller. .
The rear fixed cover is also prone to short lint, mainly because this part is rigidly carded. Although it is freely combed, the process between the rear fixed cover and the cylinder If the gauge is too small, it is easy to produce short lint, and the carding ability of the licker-in is poor, and the fiber bundles produced are large in size, making it easier to produce short lint. If chemical fiber products are spun, stiff sheets are likely to occur in this area.
Exclusion of short lint��The conventional idea is mainly to eliminate it through the cover plate method. The original A186 carding machine (without a pre-carding plate) had a mesh type small leakage bottom. The purpose of this design was mainly to exclude part of the short lint. However, due to a misunderstanding of the small leakage bottom entrance process, small leakage bottoms were caused. The mesh is seriously clogged, which fails to achieve the purpose of removing short lint and affects product quality. Later, the mesh type small leak bottom was changed to a light plate type, mainly to avoid the leak bottom being filled.
In the blowroom-carding unit, due to the fast cylinder speed and the high density of the selected cylinders and cover plates, the amount of short lint produced is also large, so the blowroom-carding unit carding machine The short lint is mainly eliminated through the cover flower, but it can also be eliminated through the action of cotton mesh cleaner, especially the front cotton mesh cleaner. At this time, it can be adjusted through the technology of the cotton mesh cleaner, such as the technology of the dust collector, the technology of the guide plate, the width of the exhaust port, etc. </p
