Compared with hand-picked cotton, domestic machine-picked cotton has poorer consistency, higher impurity content, higher lint rate, shorter length, more foreign fibers, especially more mulch, which is difficult to clean during the processing; It is easy to produce short lint; 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 fibers? 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: operating efficiency should be above 85% , 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 extending out of the ribs should be positive or negative; decrease Control the movement; check whether there are any 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 – between distributions; the length of return strips – the length is less than 30cm.
02 Blowroom – fine cotton opener
Things to note about the opening roller Speed; status of card clothing; configuration of card clothing (such as FA109 fine opener second licker-in roller AT7510*015042V, third licker-in roller AT6020*06332V, FA116 opener acceleration roller AT5925*09030V, carding roller AT4025*05625V .
03 Carding-licker-in
It is a hand-held carding machine that breaks down 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 carding force is large, and the amount of short staple increases is large. For machine-picked cotton, single-particle impurities are mainly small impurities , there are also a large number of fiber-bearing seeds, and the impurities are light and easily wrapped in the bundle fibers, 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 the impurities to be exposed to the bundle fibers The surface is eliminated by centrifugal force. It is necessary to pay attention to the process distance setting between the cotton feeding roller and the cotton feeding plate (differentiation of the feeding method); the feeding roller speed (the draft multiple of the carding machine and the sliver delivery speed); The process distance between the cotton roller and the licker-in (the process distance between the cotton feeding plate and the licker-in roller); the speed of the licker-in; the configuration and status of the card clothing; the configuration and status of the card clothing; the structure of the feeding cotton layer and state, mainly the density of the cotton layer 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 fibers, but are also the main areas for the removal of fine neps and adhesive impurities; they are the main areas for short staple and single fibers. Exclusion area for particulate impurities;
05 Additional originals:
The bundled fibers come from the licker-in needle After the cloth is transferred to the surface of the cylinder card clothing, it must first be carded by the additional carding element. Especially the use of the rear cotton net cleaner will greatly reduce the entry of single particles of impurities into the cylinder and cover carding areas, reducing the cover cost. It reduces the carding load of the plate and cylinder, and at the same time reduces the pulverization of impurities during the carding process and reduces the generation of impurities. The selection of fixed cover plates and cotton mesh cleaners after machine-picked cotton and the reasonable configuration of card clothing and technology are fundamental .</p
