Performance Optimization Of Carding Equipment To Improve Yarn Quality

With the development of cotton spinning industry and the progress of science and technology, all kinds of differential spinning fibers have been developed and new cotton spinning products have been developed in an endless stream. It has been proved by practice that the carding process as a spinning heart is particularly important in improving the quality of differential fiber yarns, especially the selection and matching of special equipment in carding machine parts. Through years of exploration and practice, our company has summed up a set of production experience from the selection of equipment, process configuration and the impact on product quality in the development of differentiated fiber based products.

Practice has proved that due to the great differences in the basic properties of all kinds of differential fiber materials, the first thing to be considered in the carding machine is whether it can produce normally, and there is no such thing as winding tin, doffer transfer difficulty, cotton net falling or cotton net quality bad, and bar forming difficulties. Therefore, the selection of carding equipment should not only consider quality, but also consider the applicability of various fibers to ensure normal production. Through long-term tests, the selection of our combing equipment is mainly based on the clothing of Nantong Jinlun, Swiss Graff, Japan Jinjing and other manufacturers. There are also some mature experiences in the selection of carding equipment specifications.

　　 Cylinder clothing It is the key to all the carding machines and the main functions of carding. Therefore, special attention should be paid to the selection of Xilin card clothing, including the material, specification and type of card clothing and processing technology of card clothing, which are suitable for the development requirements of high speed and high yield carding machine, and at the same time, to meet the production requirements of diversified varieties.

On the specification of card clothing, although we produce differential fibers, we insist on cotton card clothing. technology The characteristics are to meet the basic requirements of "short, shallow, sharp, thin, dense and small", generally 20 series. The tooth density is controlled at not less than 800 teeth / square inch, the thickness of the base of the tooth is 0.4 to 0.5 millimeters, the working angle is generally controlled at 60 degrees, and the transverse tooth density is adopted at the same time, so that the fiber dimension can be fully combed and mixed, and the bundle like fibers can be reduced as much as possible. fibre The single fiber state. In this case, the yarn indexes are relatively good, especially the neps and yarn defects. Table 1 is the comparative test data of different specifications of cylinder clothing.

The selection of flat clothing should be matched with the cylinder clothing. It is necessary to ensure the hardness and wear resistance of the needle tip of the flat clothing, while ensuring the bending resistance of the needle, avoiding the phenomenon that the card clothing is damaged when the card clothing is straightened out during the carding process. In the arrangement of needle rows, the density is generally denser and the density is more than 340~420 stitches per square inch. Table 2 is the contrast test of our company in selecting different sizes of flat clothing. It can be seen from the test results that the proper increase of the density of the cover plate will play a certain role in improving the yarn quality.

In general, the small craft angle of the doffer clothing is favorable for the transfer and stripping of the fibers, and the relatively slightly higher circular arc tooth profile is applied to the height of the needle teeth, so as to increase the capacity of the fibers between the teeth and increase the holding force of the fibers, thereby enhancing the transfer of the fibers, and at the same time, playing the role of guiding the air flow generated by the high-speed rotation of the cylinder. For the differential fiber with relatively poor cohesion between fibers, in order to effectively improve the transfer of fibers, the currently launched doffer clothing with side grooves is being gradually used. For this card clothing, our company has carried out related experiments (see Table 3). The yarn index of the card clothing with grooves is obviously improved, especially the +200% neps and A1 defects. It has been proved by practice that this kind of card clothing is more effective for the holding type fiber. The phenomenon of cotton net in the doffer triangle area can be well solved, thus reducing the occurrence of defects such as unevenness of raw sliver and thick and thin sections.