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[Discussion on the technology of producing semi-worsted yarn by automatic winder]
共阅[748]次 Release date: [2019/9/4] read a total of [748] times

The winding process is an indispensable process in the spinning process. With the development of the semi-worsted spinning process, the role of the automatic winder in the production of semi-worsted spinning has been paid more and more attention. In semi-worsted production, relatively advanced automatic winders are generally used. Most of them are equipped with electronic yarn clearers and air splicers. They have a high degree of automation, a low failure rate, and high quality yarns. The big advantage is the variety adaptation. Strong sex. And for some special semi-worsted yarn varieties, normal winding machines may not be able to produce normally, and the use of automatic winders can achieve more results with less effort.


Therefore, in view of the particularity of the semi-worsted yarn and the production difficulties of the winding process, how to make good use of the automatic winder in the practice of semi-worsted production is a new subject.


Characteristics of semi-worsted yarn


"Semi-worsted" products are between worsted and worsted. Nowadays, the "semi-worsted spinning" in the industry mostly adopts the organic combination of wool spinning equipment and cotton spinning equipment, integrating cotton spinning technology with wool spinning technology. Compared with the worsted spinning process, the production process is shorter, forming a new type of spinning process. . The yarn has the characteristics of good dryness and smoothness of the combed yarn, and the good feel, elasticity, and fluffy of the carded yarn, and has a wide range of spinnable counts and strong applicability of raw materials. Compared with carded yarn, the CV value of the sliver is reduced, and the anti-pilling index is also improved.


After several years of development, the semi-worsted process technology has begun to take shape in the industry. Now its products are not only woolen yarns, but have also developed into the production of cotton, silk, linen and other blended yarns, which have penetrated into cotton and silk spinning industries. Semi-worsted yarns have the following characteristics: diversified varieties and mixed raw material components; yarn twist is generally greater than cotton yarns of the same number and combed yarns, and some products are strongly twisted yarns, which makes it difficult to untwist during twisting; After dyeing, the strength of the single fiber is mostly damaged to varying degrees, especially cotton, wool, and velvet products, which will produce short fluff during carding, causing frequent hair defects and high shear rate of electro-clearing. , There are many joints, so the knot is more demanding; some special semi-worsted yarns have a particularly low single yarn strength, which has a great impact on the quality of the knot and the initial tension and speed of the winding; the yarn grade is high , The customer has high requirements for the appearance defects of the yarn, and the strength and appearance requirements of the knot are even higher.


In view of the above characteristics, the use of an automatic winder to produce semi-worsted yarns can easily lead to poor twisting and inherent quality problems in the package. As far as high-grade and expensive semi-worsted yarns are concerned, the control of the return rate of the automatic winder should not be ignored.


Solve the problem of poor twist quality


The poor appearance of the twisted knot is mainly caused by hair at the ends of the twisted knot, the knots are too thick or too thin, and the twisted knot strength is low. The untwisting air pressure and twisting time are not suitable, which affects the appearance of the twisted knot. To solve this problem, the following measures should be taken.


Optimize process parameters. The process changes with the variety of production, and the process parameters of the electronic yarn clearer and air splicer also change accordingly. In traditional cotton spinning and wool spinning production, the general winding process parameters such as the reference length and thickness of short thick S, long thick L, and detail T basically do not change much. However, some semi-worsted yarns may cause a lot of small short roving defects due to some reasons. If the process parameters are not changed, the miss rate of short roving defects is very high. Therefore, it is necessary to carefully and repeatedly test the production process, and to strengthen the control of small short roving defects appropriately. However, if the control is too strict, it will cause frequent joints or even chaotic cutting, and the joint quality will be poor. Therefore, the selection of process parameters should be selected in accordance with the requirements of the yarn variety and the yarn defect condition of the yarn itself, so that the piecing and the cut reach a balance.


Reasonably select the winding speed. Winding speed in production is also a process parameter that cannot be ignored. It can be comprehensively selected according to yarn number, variety and yarn quality. If the speed is too high, the yarn breakage will be more; otherwise, the equipment efficiency is low. The strength of some semi-worsted yarns may be very low. If you choose a normal winding speed of 1200 m / min, then the return rate is likely to be very high. The winding speed of general high-wool full-wool yarns can be selected from 600 m / min to 800 m / min.


Reasonably select the twisting air pressure and twisting time. The size of the twisting air pressure and the length of the twisting time directly affect the appearance and strength of the twist head. In order to ensure the twist strength of the yarn, the twisting air pressure and twisting time should be repeatedly adjusted according to different varieties. The twisting time is too short, the fiber cohesion is poor, and the appearance is thick and low in strength. Twisting time is too long, knots are tight, strong enough but fine in appearance. The twisting time set on the general model of the automatic winder is only suitable for yarns with regular twist. For multi-component blended semi-worsted yarns, the twisting time should be increased to increase the compactness of the fiber at the knot. The length of the twisting time is controlled by the position of the cam and its follower rod bolts. By turning the cam half a back and adjusting the position of the follower rod bolts, the twisting effect is better.


Adjust the knot length. The uniformity of the fiber is the main factor that determines the length of the knot. In actual production, it is necessary to adjust according to the raw material properties of the yarn to make the appearance quality of the knot ideal. In addition, different yarn counts have different joint lengths. The splice length of the low count yarn should be relatively short, while the splice length of the high count yarn should be longer, which can increase the twist strength of the yarn and ensure the splicing quality. For high-end animal fiber yarns, the adjustment range is generally 5th, and the twist length is 2.5cm. For some low-count, neat fibers, the adjustment range is generally 4th, and the twist length is 2.0cm.


Improve the inner quality of the package


The intrinsic quality problems of the package are mainly defects such as biting heads, small braids, and whitening. Generally, they are caused by tangled hairs, yarn shrinkage after severing, burping, repeated gripping of large nozzles, and the fundamental reason is twist Large difference, poor twist stability. To improve the intrinsic quality of the package, the following measures can be taken.


Reasonably select the winding speed and tension. Dyed fibers are prone to static electricity during the production process. The higher the winding speed and the higher the static electricity, the more severe the yarn strength and sliver damage. The yarn has more hairiness, and the hairiness is tangled, which is easy to form a bite. In addition, the winding tension is also a major factor affecting the decapitation. Therefore, in actual production, the winding speed and tension must be adjusted repeatedly to make it better.


Stereotype processing. In order to reduce the bite and small braids caused by burping in the production process of package yarn, the stability of the bobbin is mainly improved. Can take steaming heat setting and tube yarn for 20-24 hours, and then wind. For different varieties, different settings are used to promote the fiber stress in an unbalanced and tense state to balance, to stabilize the twist and reduce the shrinkage, to prevent uneven twist and small braids caused by yarn untwisting in the winder. Kink interference. After the bobbin yarn stability rate is increased, the defects such as the bite of the bobbin yarn and the small braid can disappear after being put on the car.


Controlling the return rate of the winder


For semi-worsted yarns with high grades and high prices, controlling the return rate of the automatic winder is of great significance. The following measures can be taken to reduce the return.


Choose a reasonable tank reversing speed. Under the condition that the error rate of finding the head of the large nozzle is as small as possible, choose a reasonable reversing speed of the grooved cylinder to minimize the amount of suction of return wire. The reversing time of the slot cylinder is constant. The higher the reversal speed, the longer the sucking yarn and the more loops; the lower the reversing speed, the shorter the sucking yarn and the less loops. Instead, efficiency is reduced. Practice has proved that in order to control the yarn return rate to a lower limit, the reverse speed of the slot cylinder and the error rate of the sucked yarn must be balanced.


Clean the anti-twist cylinder clamp back to the flower. The twisting of the anti-torsion bar cylinder clamp will directly cause the anti-torsion bar to move in place, the yarn end of the tube yarn will not be pressed tightly, the small suction nozzle will suck too much yarn during the splicing process, and the waste of return yarn will be large. The cylinder should be removed regularly to remove the clips and flowers, and lubricate the inner wall of the cylinder with grease to ensure its good function. In addition, adding a felt pad to the outside of the torsion-proof cylinder can effectively reduce the amount of backflow into the cylinder.


Adjust the anti-twist brush spacing. Anti-twist brush distance refers to the horizontal distance from the far end of the brush to the lifter of the balloon breaker. If this distance is too large, the small nozzle will suck too much yarn; and if this distance is too small, the small suction The yarn is easily broken at the mouth, which affects the success rate of splicing, resulting in repeated splicing and greater waste of return yarn. It should be adjusted repeatedly to make it better.


Reasonable configuration of process parameters. The automatic winder has a strong function of catching and catching defects. Under the premise of ensuring quality, the process parameters should be reasonably configured as much as possible to improve the equipment operation efficiency, reduce production costs and save loops.


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