Carding technical and economic effects, but also long been one of the hot issues affect the application of the mill. This article discusses the neps, trash and short fiber content issues, and the relationship between open comb Click point, cleaning, etc. sliver quality. Carding rely on advanced electrical control technology, stabilize and improve the sliver quality is the inevitable development of spinning technology is an important technological transformation project of the cotton industry, cotton spinning process is continuous, automation, modernization one of the important signs. 1, neps, trash and short fiber content issues fuzz, trends neps and impurities. According to research and test statistics can be seen Nep change. Afis meter test and hand practice is consistent with the law, after the cotton after opening and cleaning cotton, cotton loose knot with the opening of increases, but later combed the greatly reduced (75% decrease); impurity is gradually opening with cotton was related to lower; artificial test 16mm or less short fiber content is no significant change in the opening and cleaning process, while holding after carding significantly increased, especially after carding carding grip is increased substantially. 2, fine grasping, fine grasping relationship with the opening mass. Reciprocating Bale comply Blowroom process requirements, "multi-packet access, fine catch fine catch" so grab beard small and uniform impurity exposed on the surface for subsequent device "less broken off early and mix "to create the conditions. Different devices opening degree varies. Opening mass and yarn quality is more closely related. 3, the relationship between opening and cleaning beater form and short fiber, neps, impurities. Currently the world's major textile machinery manufacturing fine scutcher, tends to more impurity roller composite continuous opening, there is Marzoli's three thugs B37 type Trützschler's CVT3 machines, CVT4 type machine, Croatia Winslow Seoul's SRC-type machine, He Gete's MAC-type machine, green machine FA116 type main detrasher, King III machines and ERMB type machine serrated roller thugs, have adopted a combination of thugs, but thugs to deal with multi-drum combination In other structures, components and workmanship for research should be strengthened. From the test that, under the same conditions, Nep growth CTV3 type is 60%, CIII-type tail 70%, MAC-type tail 37.6%. 4, carding and quality of relationship. Carding carding sliver quality and there is a very important relationship, textile machines developed by the Department of class FA carding machine, single neps removal of more than 80% of C-based class 5 percentage points higher than the legislation, which also In clothing matching the most prominent influence, the test proved using reasonable cylinder, flat clothing, sliver neps be reduced by more than 30% under the same conditions clothings, through consolidation machinery, reducing the height of the root cover plate poor, reasonable narrow cylinder and flat, cylinder and fixed flat setting, carding increase the effective area of ??freedom, can reduce sliver and yarn neps more than 25%, slub yarn, detail, can reduce neps 30% or more. Relations hit points open comb, cleaning and carding sliver quality with trend short process, Rieter, Trützschler, Marzoli and Hollingsworth et carding comparative test data show that, with the strike force and increase hit points, picking crew cleaning efficiency, removal of impurities and neps growth was positively correlated with short fiber content and effective growth trend; less hit points against weak, and vice versa. At the same time, reflecting the various processes due to the different forms of combat points, cleaning efficiency difference blowroom unit is large, but the carding overall cleaning efficiency are no significant differences between 93% to 97%, which could explain the carding machine inside complementary results. Discussions on reducing short fiber technology with the development of carding, sliver quality indicators have improved and improved, but was still less than 16mm short fiber is generally high, has become a research topic on the spinning process, learned from the test data, the rate of growth of short fiber, without holding open comb no obvious single, stand-alone and holding open the comb is a more significant growth. As a factory using the same cylinder diameter three dozen handheld opener serrated, including cotton linters feast was 13.46%, including short fiber content than the raw cotton into 9/94% increase 3.52 percentage points, carding is more prominent. Many plant sliver short fiber content than the original cotton linters rate increase 7-10 percent, or even higher, is mainly due to poor cotton flow transfer, repeatedly open and clear comb caused by excessive force. Card there fed cotton layer thickness and structure than twice lap beard thick and axially aligned poor and other factors, as intensive combing growth and separation, easy to damage the fiber, short fiber content is more obvious. Taking these reasons that the reduction sliver short fiber content should be less damage fibers, multi exclude fuzz two aspects comprehensive way. 1, short process. Take a catch, an open, a mix, a clear short process, a single axial opener of opening, cleaning and having some of the higher ranked dust, exhaust Linter capabilities, multi thugs opener more categories, The common denominator is the ability to hold open the comb clear, although having a row of short fiber function, but there fuzz growing problem at the same time. Has chronologically forward to cotton "thin feed, light combat, high transfer", easing open the comb and comb combination of free open fA116 type main detrasher can keep in impurity premise feast cotton containing short Cashmere rate (<= 16mm) does not increase more than 1 percentage point. 2, to improve the grip carding status. Since the feed hopper card twice lap thick layer of cotton and cotton-level beam and the feed roller axis angle is small, sharp increase fiber damage, by increasing to gauge plate and taker of cotton between the teeth control cylinder speed, reduce licker speed, increased cylinder and licker surface linear velocity ratio (2.2 to 2.6) using conservative, reasonable longitudinal tooth density licker feed roller blade and blade wrapped ease the grip carding support efforts to improve the transfer rate of the fiber sliver short fiber content 20% to 22% reduction to 16% to 17.5%, down four to five percentage points. To slow licker teeth to feast starting point of cotton in the cotton carding plate and use to increase the length and angle of the arc to the Cotton Board, are available to reduce fiber injury. 

keywords: Carding, neps, trash, short fiber content, TRW textile,