Can you introduce the various spinning processes of ring spinning viscose and the requirements for the use of components?
Answer: Viscose fiber is the main type of regenerated cellulose fiber. Due to the low strength of viscose single fiber, it has a certain impact on weaving efficiency and wearing performance. The requirements for the spinning process and the use of special parts in each process are as follows:
01 Opening and cleaning process
Due to the uniformity of viscose fiber Good, low wet strength, few defects and only a small amount of parallel wires. The cleaning process should implement the process principle of “more loosening, less beating, diligent grasping and less grasping”. The second parallel beater of the cotton picking machine and the mixed opener, the opener and the beater of the roll forming machine all use tangential air supply to reduce the residence time of fibers in the beater chamber, and protect the fibers to reduce neps caused by rubbing. Due to insufficient cohesion of chemical fibers, cotton rolls are easily damaged and have serious roll sticking. After sealing the air suction openings on both sides of the lower dust cage and using only the dust cage to collect cotton, the surface of the cotton roll was smooth and the stickiness rate was reduced to less than 6%. In order to ensure good appearance and stable moisture regain, cotton rolls are wrapped in plastic film.
02 Carding process
Based on the characteristics of viscose fiber, the carding process adopts “more combing, less shedding and strong transfer” ” process principle, and maintain a large cylinder and licker-in speed ratio to reduce fiber damage and the generation of short lint, avoid licker-in return, and reduce cotton web neps. The distance between the licker-in roller and the cotton feeding plate is appropriately enlarged, and the cotton feeding plate is raised at the same time to reduce fiber damage. On the premise of avoiding cylinder twisting, the distance between cylinder cover plates should be controlled tightly to prevent cloud spots on the cotton net and improve fiber separation. The selection of card clothing should take into account both carding and fiber transfer, while avoiding fiber damage. The cylinder doffer gauge is too tight, which is conducive to the smooth transfer of fibers to the doffer. The sliver ration must take into account production and carding requirements. The cotton web tension is too large, which is conducive to web formation and fiber straightening.
03 Drawing process
Adopting the process of “large gap, heavy pressure, smooth drafting and clean channel” in principle. In order to eliminate fiber hooks and improve the dryness of the cooked sliver, the total draft of the first and second unions is less than the combined number, and a larger draft multiple of the rear area is used, which is beneficial to eliminating fiber front hooks; the draft of the second and rear areas is controlled at (1.2 ~1.3) times to facilitate concentrated drafting and improve evenness; the roller spacing is set larger than that of spinning cotton to ensure smooth drafting and reduce rubber roller winding.
04 Roving process
Roving adopts the process principle of “large gauge, heavy pressure, light basis weight, large twist” . Due to the long length of viscose fiber, good uniformity and large friction factor, the use of large spacing is beneficial to the smooth drafting of the sliver. Heavy pressure is beneficial to the control of fibers in the floating area in the front area of the roving and improves the evenness of the roving. The roving ration is based on It is appropriate to adapt to the drafting multiple of the spun yarn and should not be too heavy, which is conducive to the improvement of the strength and hairiness of the yarn; the roving twist coefficient should be larger under the premise of normal drafting of the spun yarn, which can not only reduce the unexpected elongation of the roving during unwinding, but also increase the The tightness of the strands in the front area of the spinning yarn can reduce the details and hairiness of the yarn and improve the strength of the yarn; appropriately increase the moisture regain of the roving to weaken the fiber stiffness, which is beneficial to reducing hairiness and increasing strength.
05 Spinning process
The spinning process adopts “heavy pressure, small jaws, small back area drafting, large back area “Gap” process principle. Because the basis weight of the roving is relatively light, it is easy to cause unexpected elongation when the roving is unwound on the spinning spindle. Therefore, the weight of the roving package should not be too heavy.
06 Winding process
On the premise of maintaining good bobbin formation, use smaller tension and rationally select power distribution. Clear parameters enhance control over long details. </p
