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. Let’s hear what common anomalies netizens have encountered and what solutions they have taken.
Common abnormalities
High raw lint. Through experiments, experience or daily inspection data analysis, it will be found that the growth rate of short lint in the carding process of the A186 carding machine (referring to the change value of the carding process from banquet cotton to card sliver lint) is within 2%, while the blowroom and carding machine The growth rate of short lint is 2% to 4%, and even the growth rate of short lint of some manufacturers is more than 6%, and the total amount of waste in the blowing and carding process is generally relatively high.
Cheduhua noil has low impurity content and high usable fiber content. Most of the cleaning and carding units 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 has collective air suction. The reason is very simple, but this will cause many manufacturers to be unaware of the situation.
The cotton feeding roller is prone to twisting. Winding the cotton feed roller will change the process distance between the cotton feed roller and the cotton feed plate, thereby changing the control of the feed 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.
The cap flower contains a large amount of long fibers. For cover flowers, we will habitually pay attention to the amount of cover flowers. If there are too many cover flowers, the production rate will be low, and the cost will be high. Therefore, the amount of cover flowers 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.
The web cleaner process never changes. For enterprises with certain technical strength, they will pay more attention to the technology of cotton mesh cleaners and conduct tests and adjustments according to specific conditions. 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.
The cover is stuffed. The same raw materials, the same technology, and the same model of flat card clothing, but the bottom of the flat card clothing is prone to congestion on the blowroom and carding unit. The stuffing is mainly short lint and dust, but there is no such thing on the A186 carding machine.
Solution: Air flow control
Different equipment has different design ideas and characteristics. To control the air flow and make the air flow stable, the most important thing is to control the thickness of the air flow boundary layer or the amount of air flow in the carding machine. However, for the carding machine, the air flow is difficult to measure and cannot be visually or felt, so only Ability to adjust and control airflow 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.
Reduce the production of lint and increase the elimination of lint
In the carding process, The main production parts of short lint are in the lick-in roller, cylinder and cover plate areas, followed by the rear fixed cover plate. The licker-in roller produces the largest amount of short lint, mainly because the licker-in roller carding is a holding carding, and the fibers carded are disordered bundles and block fibers, and the carding force is high, which can easily cause fiber damage, so it must be reasonable Select the lick-in speed and the process distance of the lick-in parts, especially the process distance between the cotton feed roller and the cotton feed plate, and the process distance between 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 carded, the process distance between the rear fixed cover and the cylinder is too small, which is prone to short lint, and the licker-in roller is separated. Poor combing ability results in large fiber bundles and is more likely to produce short lint. If chemical fiber products are spun, stiff sheets are likely to occur in this area.
The conventional approach to eliminating short lint is mainly through the cover plate method. The small leaky bottom of the original A186 carding machine (without pre-carding plate) adoptsMesh type, the purpose of this design is mainly to exclude part of the short lint, but due to the misunderstanding of the entrance process of the small leak bottom, the mesh of the small leak bottom is seriously blocked, which fails to achieve the purpose of removing the short lint, but affects the product quality. Later, many user manufacturers changed the mesh type to the light plate type, mainly to avoid leakage and bottom filling. In the blowroom and carding unit, due to the fast cylinder speed and the high density of the selected cylinders and cover plates, the amount of short lint generated is also large. Therefore, the short lint removal of the blowroom and carding unit is mainly through the cover plate flowers, but it is also This can be achieved through the action of a cotton mesh cleaner, especially a 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
