At present, the spinning equipment of my country’s textile enterprises is becoming more and more advanced, but the yarn quality of many enterprises is difficult to improve. There are many reasons. A brief analysis of the quality problems caused by them mainly includes raw materials, equipment, technology, air conditioning, and management. There are several problems, but simple management is not in place, which is also an important reason why the quality is difficult to achieve ideal quality. This article briefly analyzes the problems existing in the daily management of blowroom and carding, and puts forward suggestions for rectification, which has certain reference value for improving yarn quality and reducing yarn defects.
The diameter and number of neps in the card sliver will directly affect the number of neps and yarn defects in the yarn, especially the number of small yarn defects, and the short staple rate of the card sliver will directly affect Yarn strength, minimum strength, hairiness H value and warp breakage. Therefore, the blowroom and carding processes must not only control AFIS neps and short staple rate, but also consider the straightening state of the fiber, the diameter of the neps and the neatness of the fibers. Spend.
Common problems and solutions to blowroom operations
The cotton picking machine’s picking parameters are adjusted frequently, Cotton machine operation efficiency is low. In many small and medium-sized enterprises, the speed of cotton picking beaters remains unchanged for a long time, but the picking speed and depth of cotton picking machines are frequently adjusted. It is recommended that the beater speed be controlled at a low speed. The higher the beater speed, the greater the fiber damage, which will easily lead to the increase of neps and short staple rate. It is recommended that the operating efficiency of the reciprocating cotton picking machine should be controlled above 95%, and the minimum should be above 90%. The grabbing depth and speed can be determined according to the operating efficiency of the cotton picking machine, and the principle of grasping hard and running quickly should be mastered. After the grabbing speed and depth process are determined, the key is to ensure strict implementation, prevent workers from adjusting the picking parameters at will, ensure continuous cotton supply in the blowroom-carding process, and prevent empty cotton bins.
Continuous cotton feeding in the blowroom process is the key to ensuring uneven carding sliver weight and raw material mixing effects. It is also conducive to ensuring the stability of the cotton flow and ensuring the opening effect. and cotton and foreign fiber removal efficiency. Optimize and adjust the beater speed of each single machine in real time according to cotton distribution and seasonal changes to control the growth rate of neps and short lint at a low level, while ensuring the effective removal of neps, impurities, short lint and foreign fibers, and ensuring the opening effect of raw cotton and blending effects.
Common carding problems and solutions
Some spinning mills often have problems with card sliver neps. It pays more attention to the removal efficiency of lint, but does not pay much attention to the straightness, parallelism and carding degree of the fiber. As a result, the carding neps and lint indicators are good, but the yarn quality is not satisfactory.
01 Maintenance of special parts
Common equipment problems in the carding process are mainly concentrated in special parts. parts and maintenance. The carding process is basically completed by carding the original card, so the maintenance of the operating status of the carding original is particularly important. Otherwise, even if it is equipped with high-quality parts, the ideal combing effect will not be achieved if it is not properly maintained.
Elongation of the movable cover chain, inflexibility of the chain, wear of the heel and toe surfaces and undulation of the cover are common problems in enterprises. The cover chain is also a periodic machine accessory that needs to be replaced periodically, but many companies do not pay enough attention to it, resulting in many problems with the cover chain.
The following main issues should be paid attention to when maintaining the cover chain and movable cover frame:
1) Cover plate The elongation of the chain must be controlled within 76.2mm, and the length difference between the two cover chains must be controlled within 3 mm. Secondly, it must be ensured that the star guide plate is free of wear and distortion, and the distortion and distortion of the l4T axis of the star guide plate must be regularly corrected. Problems such as warping corners.
2) Clean and refuel the chain regularly, check the chain elongation according to the specified period, ensure that the length difference between the two chains meets the requirements, and use the shorter one for On the main drive side, it prevents the cover from running out of parallel.
3) Correctly adjust the tension of the chain. When adjusting, focus on the middle support leg and the rear support leg as a supplement to prevent the chain tension from being too large or too small, and ensure that two The chain tension must be consistent and the top surface of the cover must be level.
4) Pay attention to the lubrication effect of the lead powder block of the movable cover plate to ensure good lubrication status and prevent excessive cover plate resistance and chain elongation due to poor lubrication.
02 Cover plate heel and toe surface wear and cover plate undulation
Cover plate heel and toe surface wear The main reason for the inaccurate spacing is the fluctuation of the cover plate. In many enterprises, whether it is a sliding friction cover plate or a bearing-type rolling friction cover plate, there is a problem of cover plate fluctuation. In the management of movable covers, the main concerns are as follows: A few points:
1) Ensure the lead powder block is in a good lubrication state.
2) Ensure the installation accuracy of the equipment.
3) Ensure good lubrication and moderate tension of the movable cover chain.
03 Dust filter management of carding machine
The carding machine has poor air suction and poor cleaning Problems such as in place and movable cover inlay are also one of the important factors causing poor quality of raw sliver. Tests have shown that when the carding machine suction duct is clogged, AFIS neps will increase more than 2 times than normal. Therefore, it is necessary to ensure appropriate carding machine dust filtration air volume and smooth suction system.
04 Management of card clothing
Card clothing is both a periodic piece and an easy Damage parts. At present, the manufacturing quality of card clothing in my country is constantly improving, and the service life of domestic card clothing is increasing. However, enterprises often have the following problems in card clothing management:
1) There is no perfect card clothing replacement cycle, and the card clothing is seriously exceeded.Some companies even use them for more than 6 years, as long as they can be used, they don’t pay attention to quality.
2) Use the card clothing with injuries or illnesses.
3) There is no record of card clothing replacement. There is no periodic plan for card clothing replacement, which is very random and the card clothing management is chaotic.
It is recommended to make the following requirements for card clothing management
1) Calculate the service life of card clothing based on actual output and combine it with the service life Find the best combination with product quality requirements for replacement to ensure the service life of the card clothing and product quality.
2) Strict review must be carried out when replacing card clothing. For accidentally damaged card clothing, the cause must be identified to prevent secondary damage after the machine is put on the machine.
3) Establish a card clothing replacement ledger to reduce the randomness of card clothing replacement.
4) Continuously conduct optimization and selection tests of card clothing models, and select card clothing brands and models with high cost performance that are suitable for the company based on the actual situation of the company.
5) For enterprises with frequent variety changes and large changes in raw materials, it is recommended to choose universal card clothing to take into account the yarn quality level between different raw materials.
In short, only by fully understanding the performance of carding and blowroom equipment, combined with the optimized configuration of parts and processes, can we Ensure the carding quality and carding sliver quality, thereby ensuring the stability of carding quality indicators. </p
