Medium-length fiber is a fiber between cotton fiber and wool-type fiber, with a length between 45-76mm. Therefore, the production of medium-length fiber varieties on cotton-type equipment requires appropriate adjustments in the process. Let me share with you the development and production of medium-length A100 Tencel 65/medium-length viscose 35 55 inch count siro spun yarn by our company.
1. Selection of raw materials
Medium-length Tencel is Lenzing 2.4dtex×51mm A100. Because A100 Tencel is smooth, soft, bright, crystal clear and has weak cohesion, there is static electricity during the production process and it is easy to stick and roll. Rolla, so preprocessing is required.
The medium-length viscose is Lenzing viscose of 1.7dtex×51mm. Due to the thick fiber, the yarn count is relatively fine, and the number of fibers in the yarn cross-section is only 49. So it is necessary to optimize the process parameters and protect the fibers.
2. Spinning process
Actual measurement of Tencel The moisture regain rate is 11%, so the Tencel is pre-treated by adding water. The moisture regain rate must reach 13%, and it must be left for 24 hours before being put into production. Tencel and viscose fibers have similar moisture regains and are packaged in boxes. The process flow is:
A002D cotton picking machine → A035A mixed cotton opening machine → FA106A cotton opening machine Machine→A092 cotton feeder→A076A lap forming machine→FA186 carding machine→FA305 draw frame (three parallels)→FA456 roving frame→EJW128K spinning frame→Autoconer automatic winding machine
3. Main process parameters and technical measures of each process
1 Blow cleaning
The two raw materials are arranged and packaged in proportion, so that they are cut, filled, and evenly arranged. The first and last 5 rolls are marked separately, spun separately, and used as strips. The cotton rolls are laid horizontally and taken directly, made first and used first. Since the fiber has no impurities, it is carefully grasped and combed instead of beaten when opening, so as to reduce fiber damage, seal the bottom leakage and prevent it from falling as much as possible. The A002D beater blade extends out of the rib by 2mm, the carding beater speed is 480r/min, the A076A beater speed is 850r/min, the rolling roller speed is 11r/min, the lap length is 38.5m, the lap basis weight is 372 g/m, and the lap weight The unevenness is controlled at around 1.2%.
2 Carding
The fiber length is long and the uniformity is good. On the carding machine, it is necessary to protect the fibers, reduce fiber damage, control the short staple growth rate, fully card and quickly transfer. The distance between the doffer and the cylinder is 5 inches, and the cotton board is raised by 3mm to ensure that the air flow in each part of the air duct is smooth and unobstructed, improves the clarity of the cotton web, and eliminates small cloud spots on the cotton web; strengthens the equipment maintenance cycle and the card clothing Check and reduce neps. The sliver drum number and car number are provided on the draw frame with fixed table and eye fixing to reduce the uneven draw frame weight; appropriately enlarge the distance between parts and slow down the speed of each part. The doffer speed is 20r/min, and the cylinder speed is 290r/min. min, the licker-in speed is 650r/min, the flat speed is 80mm/min, the distance between the cylinder and the flat is 12, 10, 10, 10, 12 inches, card clothing selection: cylinder 2520×01740, doffer AD4030 ×01870, cover plate MCH42, licker-in roller AT5610×05610; card sliver basis weight is 17. 5 g/5 m, impurities are controlled at 2 grains/g, and card sliver weight unevenness is controlled at about 4%.
3 Drawing
In order to reduce the weight unevenness of the sliver , collective winding is adopted to implement defect-free operation; in order to prevent tops, the drafting channel and coiling inclined tube are wiped once every shift; in order to improve the strength of the yarn, smooth drafting is adopted to improve fiber straightness. In order to reduce the phenomenon of insufficient drafting, the roller spacing should be appropriately enlarged. The main process parameter indicators are shown in Table 1.
4 Roving process
Adopted The process principle of “low speed, small basis weight, large spacing, and large twist” is to control the roving tension well, and use medium-length widening and lengthening top pins to reduce fiber diffusion, improve the evenness and strength of the yarn, and appropriately amplify the process The spacing moment is to facilitate normal drafting. The main process parameters are shown in Table 2.
5 Spinning process
The rubber roller adopts slip drafting and the rear area adopts pressure rod. Appropriately increase the weight of the traveler to improve hairiness. Use PG1/2 4238 for the steel ring, F0 17/0 for the traveler, and use wear-resistant and anti-winding 868 rubber rollers for the top roller. The broken ends should be controlled within 20 pieces per thousand spindles. Mainly The process parameters are shown in Table 3.
6 Winding process
Because Tencel is relatively smooth, we use the DZ3/16.1E twister and zigzag untwisting tube imported from Germany to ensure that the twist strength is not less than 80% of the original yarn. We adopt a small tension and low speed process, and the tension is controlled at 10CN Within the limit, a waxing device is installed, and the electric clearing threshold is mainly controlled by details to ensure the pass rate of returning yarn defects and the pass rate of one yarn to the end. If quality alarms and lagging spindles are found, rectification must be made in time, and the quality of the package must be checked to ensure the stability of the quality. The winding speed is 1200r/min, and the electric cleaning process parameters are: N 3.5, S 1.9×2.0cm, L1.2× 23 cm, T 14%×26 cm. The quality indicators of 55-inch Siro yarn are shown in Table 4.
4. Conclusion
Production of medium and long fibers on cotton type equipment , the distance between the rollers in each process should be enlarged, and the spun yarn should be drawn with slippery. During the production process, semi-finished products should be first come, first served. The storage of roving should be separated by partitions, and the fibers should not be exposed. Each semi-finished product and finished product should be worn. The cap and whisker channels should be smooth to reduce the generation of hairiness, and the temperature and humidity should be controlled appropriately.</p
