Compact spinning: accurate control of process parameters is effective
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To produce fine yarn, we must first pay attention to the selection of raw materials. The raw cotton entering the factory is graded bale by bale and used in categories according to the inherent quality standards. Especially when producing compact-spun fine yarn, the selection of good-quality raw cotton can provide basic conditions for spinning high-quality compact-spun yarn.
Xinye Fabrics currently has a production capacity of 800,000 spindles, including 400,000 spindles of compact spinning and compact siro spinning. It mainly produces high-end compact yarn-dyed yarns. In production practice, in order to improve the quality of yarn, the company has done a lot of research on production management and process parameter optimization. The following is an example of the production of compact JC9.7tex yarn-dyed yarn.
The main effects of raw cotton on spinning yarn strength and neps are length, single fiber strength, uniformity, micronaire value, short staple rate, impurity content, etc. In order to ensure yarn strength and control neps, the company chooses Xinjiang fine velvet cotton with better quality. In the opening and cleaning process, the cotton picking car is controlled to pick up 1.0mm of cotton, and the walking speed of the car is 20m/min to ensure that the operating efficiency is above 97%. The beater blade extends out of the rib distance by -3mm to achieve “grasping frequently and catching less”. the goal of. In order to reduce the growth rate of neps and short lint in the blowroom process, the speed of each single machine beater can be appropriately reduced. Through the above measures, it is ensured that cotton is picked up accurately and mixed evenly, and the growth rate of lint and nep removal rate of blowroom cotton are controlled within the specified range, laying a good foundation for carding.
In order to control neps and reduce the generation of short fibers, the company adopts the process principles of “tight gauge, strong carding, light weight, smooth transfer, and multiple rows of short staples”, while ensuring that the licker-in, cylinder, doffer, The sharpness of the card clothing of the cover plate and the fixed cover plate ensures that the gauge is accurately loaded on the machine, and the card clothing is well matched. In order to ensure the quality of semi-finished products in the subsequent process, the company adopts the combination of 5 pre-drawing lines to reduce the total draft ratio. At the same time, the draft ratio of the post-pre-merging area is controlled at 1.75 times, and the total draft of the pre-combing preparation process is controlled at 7.5 times below, it is easy to remove the front hook, which is beneficial to the straightening and parallelism of the fibers and reduces small curls and sticky curls, thereby improving the straightening and parallelism of the fibers in the combed sliver.
The roving frame is equipped with imported Suesen weighting arm pressurization and Wuxi two rubber rollers and aprons drafting mechanism. In order to ensure the quality of the roving, through repeated comparative tests, it was finally determined that the dry basis weight of the roving is 5.0g/10m, the small yarn spindle speed is 900r/min, the medium yarn spindle speed is 1000r/min, and the large yarn spindle speed is 950r/min. The inner and outer rows, sizes The roving elongation of the yarn is controlled within 1.2% to reduce the roving breakage rate and ensure the normal operation of roving production. The twist coefficient of the roving is relatively large while ensuring that the spun yarn can be stretched. The twist coefficient of the roving is 117 to reduce the thick details of the yarn. In the spinning process, Shore A65-degree untreated low-hardness and high-elasticity rubber rollers are used. At the same time, the inspection, maintenance and assessment of the drafting components are strengthened to control the differences between the yarn evenness and the tubes.
Compact spinning yarn has less hairiness and tight structure. The friction resistance of the traveler on the rotating surface of the steel ring is large, which causes the ring traveler to wear faster and the tension in the spinning section increases, which will cause a twisting triangle area. The tension is unstable, resulting in unstable traveler operation, fluctuations in spinning yarn tension, and reduced spinning yarn quality. Therefore, the steel ring traveler must be configured reasonably, otherwise it will cause a large number of broken ends, production will not be smooth, and quality will fluctuate greatly. After actual measurement, the main quality indicators of compactly spun JC9.7tex yarn are evenness CV value of 12.35%, fine yarn knots 3/km, roving knots 19/km, neps 49/km, average strength 180CN, and strength CV value 7.8 %, hairiness index H is 1.2.
Since the strength of fine yarn is low and friction easily produces neps, the winding process should adopt a low speed and low tension process configuration to reduce the impact of doffing tension on the yarn and reduce winding breakage. The winding speed is 1100m/min, and the electric clearing channel settings are optimized according to the yarn body. At the same time, the splicing process parameters are optimized to eliminate bad joints and ensure that the splicing strength is not less than 85% of the original yarn. Through the above measures, the main quality indicators of the package yarn are: evenness CV value is 12.80%, fine yarn knots are 5/km, roving yarn knots are 19/km, neps are 54/km, average strength is 191CN, and strength CV value is 8.3%, the hairiness index H is 4.0, and there are 25 yarn defects in 10 square meters.
To produce fine yarn, we must first pay attention to the selection of raw materials and do a good job in classifying and using raw materials. The raw cotton entering the factory is graded bale by bale according to the inherent quality standards, and is classified and used in conjunction with the yarn quality requirements. Especially when producing compact yarn with fine count, the selection of raw cotton with long length, good maturity, high single fiber strength, moderate micronaire value, good uniformity and low impurity content, and fine cotton blending can help spin high-quality compact yarn. Spinning yarn provides basic conditions.
Secondly, pay attention to the selection and cycle management of spinning equipment. In the pre-spinning process, one line is fixed-length doffing, and the final can is changed as a whole after the machine to reduce the number of remaining slivers; handles are installed on the combing and final drawing cans to prevent tops from being produced during transportation; special roving trolleys are used to transport rovings , to prevent the collision of rovings and the occurrence of wooly rovings; use a special yarn inserting car to transport the bobbin for winding to prevent the bobbin from being bruised and worn, and package it with a foam net sleeve; pay attention to clean production to ensure that the spinning channel is clean, in order to reduce yarn defects.Provide support; preferably use new spinning equipment, and pay attention to the operating status of the compact spinning device to avoid sticking grid circles, hanging special-shaped pipes in U-shaped grooves, and sleeping bridge gears to ensure that the spinning lines are dry and reduce details. Ensure the strength of the finished yarn; strictly control the maintenance cycle and use cycle of the spinning equipment in each process, and give full play to the effective control of the fiber by the spinning equipment; pay attention to negative pressure management and the cleaning cycle and cleaning standards of the dust filter to avoid sudden yarn accidents Defects and neps fluctuate to ensure the yarn gathering effect and physical quality.
In addition, temperature and humidity must be strictly controlled to ensure that the moisture regain of each process is within the control range to ensure stable moisture absorption and release throughout the entire process. Especially in the low-temperature and low-humidity seasons, temperature and humidity management must be strengthened from raw cotton to the roughening process. Store the roving in a fixed position for moisture absorption balance, so that the moisture regain rate of the roving reaches more than 7.0%, thereby ensuring the balance and stability of moisture absorption and release, and stably improving product quality. (Wang Dandan of Xinye Fabric Co., Ltd.)
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