Although the blowroom-combing process is short, the holding and striking points are no less than those of traditional blowroom combs. So, what common quality problems will occur in the production of blowroom-carding combs? What measures should be taken to prevent and solve quality problems? ?
Frequently Asked Questions about Cleaning and Carding Alliance
1. The short velvet of raw strips is high. 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.
2. The noils of the car belly flower have 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.
3. 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.
4. Cover flowers contain 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.
5. The cotton mesh cleaner process never changes. For enterprises with certain technical strength, they will pay more attention to the technology of cotton mesh cleaners and conduct experiments 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.
6. 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.
Methods to reduce and increase the elimination of short lint:
1. In the carding process, the main production parts of short lint are in the licker-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.
2. 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 thorns. The roller carding ability is poor, and the fiber bundles produced are large in size and are more likely to produce short lint. If chemical fiber products are spun, stiff sheets will easily occur in this area.
3. To eliminate short velvet, the conventional idea is mainly to eliminate it through the cover plate method. The original A186 carding machine (without a pre-carding plate) used a mesh type for the small drain bottom. The purpose of this design was mainly to exclude part of the short lint. However, due to a misunderstanding of the small leak bottom entrance process, the small leak bottom mesh was caused. Serious clogging will not achieve the purpose of lint discharge, but will affect 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-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-carding unit carding machine 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.
Air flow control of blowroom and carding unit:
1. 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.
2. 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.
3. Increase the release of airflow. First of all, we must take advantage of the cotton mesh cleaner and adjust the cotton mesh cleaner appropriately.Adjust the process distance, and then use other suction areas, such as the suction device on the licker-in, the suction device under the large drain, etc.
4. 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.
Through the above analysis, common problems in the blowroom and carding unit can be basically eliminated. At the same time, in daily production, equipment maintenance must be done in a timely manner to ensure that the equipment is in stable condition, so as to ensure normal and stable production.
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