The abnormal state of waste on the elastic cover of the carding machine is caused by the difference in the control and release capabilities of the fiber bundles between the cover and the cylinder card clothing. During the carding process, the load on the needle surface is increased and the arrangement is uneven. Only by analyzing its correlation with carding quality, gradually eliminating, verifying and identifying the reasons for the abnormal state of flat noil, and carrying out effective control can we solve the problem of poor flat noil condition.
01 Analysis of the causes and causes of abnormal cover noil
Comparison of the normal and abnormal status of flat plate noil: The flat plate noil status is a combination of the process design of the cylinder flat plate carding area, the card clothing status, and fiber transfer. reflect.
The normal status of flat waste is usually evaluated by considering the following factors:
① The quantity of flat waste, under the condition of ensuring the yarn quality, the flat waste The less the amount of waste, the better;
② The shape of the cover board waste, the noil of each cover board is thick at the head and thin at the tail. There are few long bridging fibers between the two cover boards. The more bridging fibers there are, it means that the flat carding is not normal and the long fibers in the flat waste are lost more;
③ There are less long fibers and spinnable fibers in the flat waste, and more short fibers. If there are more spinnable fibers and less short lint, it means that the quality of the cover waste is poor;
④ The number of impurities and neps contained in the cover waste, if the number of neps and impurities If less, it means that the quality of the cover waste is poor;
⑤ The color of the cover waste. If the color of the cover waste is inconsistent or black, it proves that there is a problem with the process;
⑥ The appearance distribution of cover waste, its uniformity, the accumulation state of fiber bundles and linters, etc.
The normal status of cover waste is summarized as follows:
① According to the process requirements, the weight and quality of cover waste meet the process design requirements, among which The proportion of spun fibers is not more than 65%;
② The appearance of the cover plate waste is evenly arranged, without excessive long fibers, no accumulation of cotton bundles, and no rubbing of cotton balls;
③ The cover plate has no obvious appearance of being too black or too white.
See Figure 1 and Figure 2 for a detailed comparison of the noil status of the normal cover.
Figure 1 The normal cover noil state of cotton fiber
Figure 2 Normal status of non-cotton fiber cover noil
The specific abnormal status of cover noil is:
① The thickness and distribution of the noil on the cover are uneven, and the fibers are messy;
② The noil on the cover has more medium and long fibers, the weight is too high, and the noil is abnormal. The key point is the difference. Chemical fiber and chemical fiber;
③ The color of the cover waste is greatly different, and there are pastels;
④ Cotton balls, cotton bundles, and clumps of fibers in the cover waste More, more bridging fibers;
⑤ The cover plate is hung and wrapped.
See Figure 3 to Figure 10 for specific abnormal conditions.
Figure 3 Cover waste is too thick
Figure 4 The thickness of the cover plate waste is uneven
Figure 5 Cover falling Cotton embedded in the bottom of the card clothing teeth
Figure 6 Abnormal hanging flowers when removing cotton from cover plate
Figure 7 There are cotton balls in the cover waste and many bridging fibers
Figure 8 There are too many medium and long fibers in the cover waste
Figure 9 Cover Waste hanging cover board
Figure 10 Fiber bundle accumulation in cover waste
02 Causes and effects of abnormal cover plate noil
According to the characteristics of the cylinder cover carding area: the abnormal cover plate noil is due to the transfer process In the process, the control and release are out of balance, causing too much or too little fiber transfer, accumulating on a certain needle area, and finally being grabbed by the cover plate needle teeth, turning out the abnormal state of forming the cover plate waste accumulation.
Further analysis: There are differences in the weight, density, and structure of the cover plate waste during the transfer process. The cover plate must be covered first.The ability of the needle to hold the fiber and the ability to suck and release the fiber to control the fiber cause changes in the number of times the fiber is combed, premature rotation and excessive control; on the other hand, the sucking and releasing ability of the cylinder card clothing state, It is caused by factors such as affecting the needle surface load and fiber transfer; the third reason is the number of floating fibers between the cylinder needle surfaces, or the abnormality of the fibers on a certain needle surface, which causes abnormal cover plate noil. The main causes of abnormal fiber state changes are the geometric dimensions of the cylinder and cover plate, fiber performance differences, temperature and humidity environment, carding airflow process, etc., equipment management, and the accuracy of basic equipment parts. See Table 1 to Table 3 for specific factor analysis.
Table 1 Analysis of the reasons why cylinder card clothing affects the uneven noil state of the cover plate
Table 2 Analysis of the causes of uneven flat noil state caused by flat card clothing
Table 3 Analysis of other factors affecting the uneven noil status of the cover plate
03 Effects and control measures of abnormal flat noil status
The main impact of abnormal flat noil status: the quality of card clothing causes an increase in neps, making life difficult, and nodding The cost increases, quality fluctuations are caused by wrapping and hanging, and safety accidents and equipment accidents occur frequently. The problem of abnormal flat sheet waste is mainly caused by improper configuration of card clothing, differences in card clothing design and fiber performance, improper process design and inspection, poor equipment accuracy and equipment management, and other factors.
Specific control measures:
① Select card clothing according to fiber properties to reduce the needle surface load during the carding process, focusing on solving the problem between control transfer Contradictions and reduce abnormal phenomena;
② According to the performance and characteristics of the fiber, design the geometric dimensions of the card clothing to give consideration to its control ability and transfer ability, and reduce the abnormal cotton cover caused by uneven load on the needle surface;
③ Design the process based on fiber properties to reduce problems such as static electricity and unstable airflow control during the carding process, and reduce uneven conditions;
④ Strengthen inspection and familiarity with fiber properties , carry out pretreatment and temperature and humidity control before fiber carding, and control it from the source;
⑤ Strengthen the basic management of equipment, improve the accuracy of basic parts, ensure that it controls fibers evenly, transfers fibers evenly, and reduces inaccuracies. uniform state. </p
