Carding of chemical fibers with the same carding process and carding elements as for cotton spinning presents the following problems. Grinder A spinning machine that turns fiber strands into rovings. The main function is to draft and twist, and to wind the roving into a certain package to meet the processing requirements of the spinning frame.
During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery. According to the spinning process, carding is an important process.
The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). (1) The fiber carding and static friction elements are difficult to ground, so it is easy to adsorb the fiber carding elements, which leads to the carding of Xinjinlong, Doffer and cover on the needle teeth. (2) Chemical fiber, especially for synthetic fibers, has good resilience and fluffy sliver, and it is not easy to block the information channel through a bell mouth and two inclined tubes.
Therefore, standard curve inclined tubes are often used when spinning chemical fibers. (3) Moisture regain changes fibers, viscose fibers are larger than cotton, cotton, and synthetic fibers have a smaller coefficient of friction than synthetic fibers, and have a larger coefficient of friction with metals and larger, wool prone to tampons, and the friction coefficient of the broken edge of the cotton web. (4) The chemical fiber is long, especially for the medium-long chemical fiber, if the production process is not adjusted accordingly, it may cause damage and fiber, and make the transfer of the fiber abnormal.
(5) Chemical fibers generally only contain a small amount of rented hard wires, while silk and rubber Egyptian ultra-long fibers have good length uniformity and a small content of short piles. Therefore, the use of ordinary cotton spinning process will result in excessive noil loss. Therefore, in order to obtain a good carding effect, the chemical processing, the chemical properties of the treatment should be appropriately selected according to the carding elements, and the carding process should be appropriately adjusted.
Secondly, the selection of carding components of the card is very important. The carding can be synthesized and the fiber must be made of Chinese chemical fiber or cotton and chemical fiber metal clothing, otherwise students will easily lead to needle gaps and entanglement. The phenomenon of Xin Jinlong. The selection of metal card clothing for spinning chemical fiber should be based on the development of chemical fiber without entanglement of Xinjinlong sliver with less neps and good clarity of cotton web. The friction coefficient between synthetic fibers and metal needle teeth is large, so the working angle of Xinjinlong needle teeth used for spinning fibers should be appropriately increased, the tooth depth should be shallow, the tooth density should be adopted, and the tooth shape should be negative-angle arc back.
this“large angle”,“shallow teeth”,“arc back”Xinjinlong needle teeth enhance the release and transfer ability of chemical fibers, which can effectively prevent chemical fibers from entangling Xinjinlong, which is conducive to the transfer of fibers to doffers. Daofu card clothing should be Xinjinlong card clothing. The higher dough transfer rate is beneficial to reduce needle load and neps in the working area of the silk cover.
Therefore, the difference between the working angles of the two needles is larger than that of spinning cotton to improve the transfer rate. The needle tooth density of the cover plate should be thinner, the diameter of the comb needles should be slightly thicker, and the needle height should be shorter, which can meet the requirements of high-yield and strong combing. The licker-in saw blade currently generally uses 80°X4.5 teeth/25.4mm specification, the effect is good.
In particular, the thin saw blade has a strong ability to pierce and comb the cotton beard. In order to avoid the left and right sides of the drum, some factories choose a larger working angle of the sawtooth, X3.5 teeth/25.4mm, but the carding effect is weakened and the carding effect is poor.