Production of fine yarn first option should pay attention to the raw material, raw cotton into the plant in accordance with internal quality standards, grading each packet classification to use. Especially in the production of fine yarn spinning, selection of good quality cotton, for high-quality compact yarn spun provide basic conditions.
The new field of textile existing production capacity 800,000, including compact spinning and compact sirospun 400,000, mainly produces high-grade yarn-dyed yarn spinning. In production practice, in order to improve yarn quality, the company has done a lot of exploring to optimize the production management and process parameters. The following JC9.7tex dyed yarn spinning to the production as an example.
Effect of raw cotton and cotton yarn knot strength is mainly the length of a single fiber strength, uniformity, micronaire, short fiber content, trash content, etc., in order to ensure control of cotton yarn and knot strength, better quality companies to use Xinjiang upland. In the opening and picking process control bale bale trolley amount of 1.0mm, trolley travel speed of 20m / min, to ensure the operating efficiency of more than 97%, thugs blade protruding rib distance -3mm, in order to achieve “less frequently catch catch” purposes. To reduce the opening and picking process neps, short fiber growth, may be appropriate to reduce the speed of each single station thugs. Through the above measures, to ensure that the fine bale evenly mixed, opening and cleaning cotton linters growth and knot clearance controlled within a predetermined range, to lay a good foundation for carding comb.
To control neps, short fibers to reduce the generation of the company a “tight gauge, strong carding, quantitative light, smooth transfer, multi-row fuzz” process principle, while ensuring licker, cylinder, Astoria, cover and sharpness fixed cover clothing, to ensure an accurate gauge on the car, and do a good job matching clothing. Semi-finished products after the procedure in order to ensure quality, the company pre and Article 5 merging, reducing the total draw ratio, while controlling the pre and post-draft ratio at 1.75 times, the total draft before combing preparation process control in 7.5 times, easy to eliminate before the hook, in favor of straight and parallel fibers and reduce small volumes, sticky roll, thereby improving straight and parallel bar combed fibers.
Roving machine equipped with imported SUESSEN cradle pressure, Wuxi two rubber rollers apron drafting system. In order to ensure the quality roving through repeated comparison test, finalize roving dry weight of 5.0g / 10m, small spindle speed of 900r / min, the spindle speed of 1000r / min, large spindle speed of 950r / min, in efflux, size roving yarn elongation control in less than 1.2%, in order to reduce the roving breakage rates, in order to ensure the normal operation of the roving production. Roving twist factor in ensuring the spinning can draw open the case is too large to grasp, roving twist factor of 117, to reduce the thick and thin yarn. Spinning process selection Shore A65 of not treating low hardness and high elastic rubber roller, while strengthening checks drawn parts maintenance and assessment, control and possession of a difference between the yarn evenness.
Compact yarn hairiness, compact, bead ring of the rotary friction surface is large, the steel ring traveler wear faster, spinning segment increased tension can cause twisting triangle tension instability, resulting in unstable bead, yarn tension fluctuations, decreased quality of yarn. It must be reasonable allocation steel ring traveler, otherwise it will cause a lot of breakage, the production is not smooth, quality fluctuations. After measurement, spinning yarn main quality indicators JC9.7tex CV value 12.35%, spinning section 3 / km, roving section 19 / km, Nep 49 / km, average strength 180CN, strong CV of 7.8 %, hairiness H 1.2.
Since the fine yarn strength low friction easy to produce neps, thus winding process should be used at low speed, low tension process configuration, reduce the impact of doffing of the yarn tension, but also reduce the winding breakage. Winding speed adoption 1100m / min, electricity clear channel settings to optimize yarn body, while optimizing the configuration parameters of the splicing process, eliminate bad connector, ensure splice strength not less than 85% of the original yarn. Through the above measures, the cheese master
To quality indicators: evenness CV value of 12.80%, the yarn section 5 / km, roving section 19 / km, cotton became 54 / km, the average strength of 191CN, strong CV value of 8.3% for the hairiness H 4.0,10 meters yarn faults 25.
Production of fine yarn, the raw material must first pay attention to matching, good use of classified material. Raw cotton into the plant in accordance with internal quality standards, grading by package, combined with the yarn quality requirements for classification use. Especially in the production of fine yarn spinning, the choice of long length, good maturity, high single fiber strength, micronaire moderate, good uniformity and low impurity raw cotton, with cotton fine, for high-quality spun close yarn provide basic conditions.
Second, the emphasis on special spinning equipment selection and cycle management. Spinning process doffing a line length, and the use of collective change after the last barrel, reducing the number of surplus receipt; in the combing sliver end and install handle and prevent tops during transport; transport roving with roving trolleys prevent roving wool roving collide appear; inserted yarn winding dedicated car transport cheese, cheese prevent bumps, masticate, and foam packaging nets; emphasis on clean production, spinning passage ensure clean, to reduce the yarn faults to provide support; Textile College is preferable to use the new equipment, while focusing on running spinning device section, to avoid blocking sticky mesh circle, shaped U-shaped groove hang, idler gear nap, to ensure that the yarn evenness, reducing detail to ensure that yarn strength; strict control of each step of spinning special equipment maintenance cycle and use cycle, give full play to the effective control of equipment designed spun fibers; emphasis on standard vacuum cleaning cycle and cleaning management and dust filter, avoid sudden yarn faults and neps appear fluctuations which ensures the agglomeration effect and physical quality.
In addition, we must strictly control the temperature and humidity, so that each process has reached regain control range, to ensure the whole process of absorption and desorption stability, especially low temperature and humidity season, starting from raw cotton and crude steps to strengthen the management of temperature and humidity, the roving store equilibrium moisture carried in a fixed position, so that roving regain more than 7.0%, so as to ensure absorption and desorption balance and stability, and stability and improve product quality.
