Domestic machine-picked cotton has poor consistency, high impurity content, high lint rate, short length, and more foreign fibers, especially mulch, which is difficult to clean up during processing compared to hand-picked cotton; it is easy to produce short during processing. Cashmere; more fine neps, especially long fibers produce more fine neps. With the widespread promotion of machine-picked cotton in Xinjiang, machine-picked cotton will become the main raw material of China's cotton spinning industry in the future. However, from the current situation, there are still many problems in the application of machine-picked cotton in the industry. The processing technology of each link needs to be studied, especially Carding process.
So how to improve the fiber opening effect? How to improve the removal rate of neps, impurities, lint, etc. The following briefly describes some key processing points.
1, clear flower-cotton grabbing machine
The cotton grabber considers the following processes: operating efficiency, which must be above 85%, high operating efficiency, good opening effect, and obvious mixing effect; the trolley running speed, appropriately increasing the running speed, is conducive to mixing; the distance of the blade protruding from the rib , Whether to use a positive or negative distance; control of the descending stroke; check whether the blades, ribs are abnormal. Need to pay attention to the arrangement of cotton bales-trimming and filling; between the arrangement of flowers and recycled cotton-between the distribution; the length of the return strip-less than 30cm.
2, clear flower--fine opener
Need to pay attention to the speed of the opening roller; the state of the card clothing; the configuration of the card clothing (such as FA109 fine opener, second licker-in AT7510 * 015042V, third opener AT6020 * 06332V, FA116 opener acceleration roller AT5925 * 09030V, carding roller AT4025 * 05625V.
3, Carding-Licker-in
The belongs to holding carding, which breaks the big cotton bunches into small cotton bunches. The opening effect directly affects the rear carding effect; it is also the main area for eliminating large impurities, but the carding force is large, and the amount of short fluff increases. For machine-picked cotton, single-particle impurities are mainly small impurities, and there are also a large number of seeds with fiber. The impurities are light, and it is easy to be wrapped in bundle fibers, which is difficult to eliminate. Only by improving the opening effect, the better the opening effect, the smaller the volume of the cotton bundle, and the more easily the impurities are exposed on the surface of the bundle fiber, which is eliminated by centrifugal force. It is necessary to pay attention to the setting of the process distance between the cotton roller and the cotton board (different feeding methods); the speed of the cotton roller (drawing multiple of the card and the delivery speed); the speed of the cotton roller and the licker-in Process gap (process gap between cotton feeding board and licker-in); licker-in speed; card clothing configuration and card clothing status; card clothing configuration and card clothing status; structure and state of the fed cotton layer, mainly cotton The density of the layer is moderate and uniformly distributed;
4. Cover and cylinder
The carding cylinder and the cover are the main carding areas, which improve the straightness, parallelism and separation of the fibers, but are also the main areas for removing fine neps and adhesive impurities; they are short fluff and single particle impurities. Exclusion area;
5. Attach original:
After the bundled fibers are transferred from the licker-in card clothing to the surface of the cylinder card clothing, they must first be subjected to a carding with a rear carding element, especially the use of a rear cotton cleaner, which will greatly reduce the single particle impurities entering the cylinder and the cover. The carding area of the board reduces the carding load of the cover plate and the cylinder, and at the same time reduces the powder of impurities during the carding process and reduces the generation of impurities. The selection of fixed cover, cotton net cleaner and the reasonable configuration of the card clothing and process after the machine picks cotton are fundamental.
