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Enhanced carding can cause the fibers to straighten, break down into single fibers, and promote the separation of the fibers from the impurities while also releasing the neps. Therefore, the “precise†of the main combing gauge and the sharpness of the combing element are extremely important.
2 Divide the waste properly
It is most advantageous to know what impurities are falling in what processes and parts, that is, to eliminate impurities in a reasonable division of labor. In addition, the division of labor must be properly performed in all parts of the carding machine itself. Generally the larger apparent to exclude the separation of impurities should implement the principle of less broken off early, as early as fall in the opening and cleaning processes. Fiber-bound impurities with high adhesion, especially with long-fiber impurities, are eliminated on the carding machine. Therefore, when the maturity of the raw cotton is poor and there are many harmful defects in the fiber, the carding machine should be properly removed for removing impurities and droppings. The slitting roller portion of the carding machine should eliminate broken seeds, deadlocks and short fibers, as well as fine impurities with short fibers. The cover should be suitable to eliminate fine impurities, neps, short velvet and so on.
For general domestic cotton, the total cotton yield of carding is greater than that of open cotton. The cleaning efficiency of cotton (to raw cotton) should be controlled between 50% and 65%. The efficiency of removing the miscellaneous section of the carding roll (with miscellaneous laps) should be controlled between 50% and 60%. The efficiency is controlled within the range of 3%-10%, and the sliver inclusion rate should generally be controlled below 0.15%.
The key to controlling the impurities on the carding machine is in the licker-in section, and the production parameters are achieved by adjusting the process parameters of the small leaking bottom and the degumming knife, such as the small leak-bottom entrance gauge and the fourth gauge gauge, and the level of the dust-removing knife. When the maturity of the raw cotton is poor and the yam contains more impurities, resulting in an increase in the inclusion of slivers, a small leak at the bottom of the entrance should be taken, and the length of the outbreak area should be increased to adjust. The pipette cover should not be blocked on the suction cup cover, otherwise it will cause the rear car bumper to be abnormally cotton and increase whitening. If the length of the missing bottom chord is too long and the size of the slitting tooth is not suitable, the inclusion of slivers will increase. The specification of cylinder clothing and the cover, the spacing between the front cover and the cylinder, the position of the front upper cover plate, and the speed of the cover plate all affect the inclusion of nodules and the number of neps.
3 Reduce rubbing
The neps produced on the carding machine is mainly formed by the re-entry, the winding and the fiber rubbing. Such as Xilin to Astoria, Xilin to the cover plate spacing is too large and the needle is relatively blunt, the fiber is excessively rubbed, and such as the ligature reentry and cylinder Linhua will increase the nep. The sliver neat is increased when the process of opening and rinsing is severe, the moisture regain of the lap is too high, and the ratio of back to back and re-use of cotton is too large or the feeding is uneven.
Rational distribution of cotton and strengthening of temperature and humidity management have a considerable effect on reducing neps and impurities. When blending cotton, several indicators that have a greater impact on yarn formation, such as maturity, harmful defects, and impurities, should be strengthened to control the differences in indicators. When the moisture regain of raw cotton and laps is low, the impurities are likely to fall and the end of the cotton can be reduced. Therefore, the moisture regain of the lap should not exceed 8% to 8.5 %, and the raw cotton should not exceed 10% to 11%. Control the low relative humidity of carding workshops, such as controlling the relative humidity at 55%-60%, allowing it to evaporate, increasing the stiffness and elasticity of the fibers, and reducing the friction and filling of the fibers with the clothing. However, when the relative temperature is too low, static electricity is easily generated, and the cotton net is easily broken, adhered or broken. This phenomenon is even more pronounced when spinning chemical fibers. If the relative humidity is too low, it will reduce the moisture regain of the sliver and will be detrimental to the subsequent drafting process.
The use of high-quality copper alloy clothing, enhanced carding, and increased suction points and suction volume on each carding machine can all greatly reduce stickiness.
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