Compared with hand-picked cotton, domestic machine-picked cotton has poorer consistency, higher impurity content, higher short lint rate, short length, and more foreign fibers. In particular, there is a lot of mulch film, which is difficult to clean during the processing; short fibers are easily produced during the processing. Velvet; there are many fine neps, especially those produced by long fibers. With the widespread promotion of machine-picked cotton in Xinjiang, machine-picked cotton will become the main raw material of my country’s cotton spinning industry in the future. However, judging 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 Cleaning and carding process.
So how to improve the opening effect of fiber? How to improve the removal rate of neps, impurities, short lint, etc.? The following is a brief description of some key processing points that need to be noted.
01 Blowing machine – cotton picking machine
The cotton picking machine considers the following processes: the operating efficiency should be above 85%, with high operating efficiency, good opening effect, and obvious mixing effect; the running speed of the trolley should be appropriately increased to facilitate mixing; the distance between the blades and the ribs , whether to use positive or negative spacing; control of the descending stroke; check whether there are abnormalities in the blades and ribs, etc. What needs to be paid attention to is the arrangement of cotton bales – cutting and filling; the arrangement of returned cotton and recycled cotton – distribution; the length of the return strips – the length is less than 30cm.
02 Blowroom——Fine cotton opener
Things to note: the speed of the opening roller; the status of the card clothing; the configuration of the card clothing (such as the second lick-in roller AT7510*015042V of the FA109 fine opener, the third lick-in roller AT6020*06332V, the acceleration roller AT5925* of the FA116 opener 09030V, opening roller AT4025*05625V.
03 Carding-licker-in
It is a hand-held carding machine that decomposes large cotton bundles into small cotton bundles. The opening effect directly affects the subsequent carding effect. It is also the main area for removing large impurities, but the force of carding is large and the amount of short fibers is increased. For machine-picked cotton, the single-particle impurities are mainly small impurities, and there are also a large number of fiber-bearing seeds. The impurities are light and can easily be wrapped in the fiber bundles, making it difficult to remove. Only by improving the opening effect, the better the opening effect, the smaller the volume of the cotton bundle, and the easier it is for impurities to be exposed on the surface of the bundle fibers and removed through centrifugal force. It is necessary to pay attention to the process distance setting between the cotton feed roller and the cotton feed plate (differentiation of the feeding method); the cotton feed roller speed (the draft multiple of the carding machine and the strip speed); the cotton feed roller and the licker-in roller. Process gauge (the process gauge between the cotton feeding plate and the licker-in roller); licker-in roller speed; card clothing configuration and card clothing status; card clothing configuration and card clothing status; structure and status of the feeding cotton layer, mainly cotton The density of the layers is moderate and evenly distributed;
04 Cover plate and cylinder
The carding cylinder and cover plate are the main carding areas, which improve the straightness, parallelism and separation of the fibers, but are also the main areas for the elimination of fine neps and adhesive impurities; they are the main areas for short lint and single particle impurities. exclude areas;
05 Attach original documents
After the bundled fibers are transferred from the licker-in card clothing to the surface of the cylinder card clothing, they must first be carded by the additional carding element, especially the use of the rear cotton net cleaner, which will greatly reduce the entry of single particle impurities into the cylinder and cover. The plate carding area reduces the carding load of the cover plate and cylinder, while reducing the pulverization of impurities during the carding process and reducing the generation of impurities. The selection of fixed cover plates and cotton mesh cleaners after machine-picked cotton, as well as the reasonable configuration of card clothing and technology are fundamental.
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