[Technical Discussion on Production of Semi-worsted Yarn by Automatic Winder]
Release date:[2019/9/4] A total of reading[368]time

The winding process is an indispensable process in the spinning process. With the development of the semi-worsted process, the role of the automatic winder in the semi-worsted production has been paid more and more attention. In semi-worsted production, relatively advanced automatic winders are used, which are equipped with electronic yarn clearers and air splicers. The degree of automation is high, the failure rate is low, and the winding quality is superior. The biggest advantage is the variety adaptability. Strong. Moreover, for some special semi-worsted yarns, it may not be able to be produced normally on ordinary winders, and the use of automatic winders can achieve twice the result with half the effort.

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

Semi-worsted yarn characteristics

The “semi-worsted” product is between fine wool and coarse wool. Nowadays, the "semi-worsted" in the industry mostly combines wool spinning equipment with cotton spinning equipment, and integrates cotton spinning technology with wool spinning technology. Compared with the fine wool spinning process, the production process is shorter, forming a new spinning process. . The yarn has the characteristics of good dryness and smoothness of the combed yarn, good hand feeling of the carded yarn, good elasticity and fluffiness, and wide range of spun yarns and strong applicability of raw materials. Compared with the carded yarn, the CV value of the strip is reduced, and the anti-pilling pilling index is also improved.

After several years of development, semi-worsted technology has begun to take shape in the industry. Now its products are not only woolen yarns, but have been developed into cotton, silk, hemp and other blended yarns, which have penetrated into cotton spinning, spinning and other industries. Semi-worsted yarns have the following characteristics: diverse varieties, mixed raw materials; yarn twist is generally larger than the same cotton yarn, combed yarn, and some products are strong crepe, which makes it difficult to remove the sputum; After dyeing, the strength of the single fiber is mostly damaged to varying degrees, especially for cotton, wool, and velvet products. When the card is combed, short velvet is produced, which causes the yarn to have frequent defects, and the shear rate of the electric cleaning is high. There are many joints, so the requirements for knots are higher; some special semi-worsted yarns have a particularly low single yarn strength, which has a great influence on the quality of the knot and the initial tension and initial speed of the winding; the yarn grade is high. The customer has a high demand for the appearance of the yarn, and the requirements for the strength and appearance of the knot are higher.

In view of the above characteristics, the use of an automatic winder to produce semi-worsted yarns is liable to cause poor knots and intrinsic quality problems. For the semi-worsted yarn with high grade and high price, the control of the yarn return rate of the automatic winder can not be ignored.

Solve the problem of poor quality

The poor appearance of the knot is mainly due to the hairiness at the ends of the knot, the knot is too thick or too thin, and the knot strength is low, mainly the parameters such as the back pressure and the twisting time are not suitable, which has an impact on the appearance quality of the knot. In order to solve this problem, the following measures should be taken.

Optimize process parameters. The process varies with the variety of production, and the process parameters of the electronic yarn clearer and air splicer also change. In the traditional cotton spinning and wool spinning production, the basic winding process parameters such as short thick S, long thick L and detail T have little change in the reference length and thickness. However, some semi-worsted yarns may cause a small number of short rovings for some reason. If the process parameters are unchanged, the rate of missed cuts on the short rovings is high. Therefore, it is necessary to carefully and repeatedly test the production of the machine, and to strengthen the control of the small short roving. However, if the control is too strict, it will cause frequent joints and even chaos, and the quality of the joint will be bad. Therefore, the choice of process parameters should be selected in combination with the requirements of the yarn type and the yarn defect of the yarn itself, so that the joint and the cut are balanced.

Reasonably choose the winding speed. The winding speed in production is also a process parameter that cannot be ignored, and can be comprehensively selected according to the yarn number, variety and yarn quality. The speed is too high, and the winding is broken. On the contrary, the equipment is inefficient. Some semi-worsted yarns may have a very low strength. If the general speed of the yarn is 1200 m/min, it is likely that the yarn return rate is high. Generally, the high-yarn full-wool yarn can be used at a speed of 600 m/min to 800 m/min.

Reasonable choice of twisting pressure and twisting time. The size of the twisting pressure and the length of the twisting time directly affect the appearance and strength of the knot. In order to ensure the strength of the yarn, the twisting pressure and the twisting time are repeatedly adjusted according to different varieties. The twisting time is too short, the fiber is poorly cohesive, and the appearance is thick and strong. The twisting time is too long, the knot is tight, the strength is strong but the appearance is fine. The twisting time set on the general type of automatic winder is only suitable for the yarn of the conventional twist. For the multi-component blended semi-worsted yarn, the twisting time of the joint should be increased to increase the tightness of the fiber at the knot. The length of the twisting time is controlled by the position of the cam and its follower bolt. By turning the cam back halfway and debugging the position of the driven rod bolt, the knotting effect is optimal.

Adjust the length of the knot. The uniformity of the fiber is the main factor determining the length of the knot. In actual production, it should be adjusted according to the raw material properties of the yarn, so that the appearance quality of the knot is ideal. In addition, different yarn counts and joint lengths are not the same. The length of the joint of the low count yarn should be relatively short, and the length of the joint of the high count yarn should be longer, which can increase the knot strength of the yarn, thereby ensuring the quality of the joint. For example, high-yield animal fiber yarns generally have a gear shift of 5 stops and a knot length of 2.5 cm. Some of the low-branched, relatively neat fibers are generally adjusted in 4th gear and the knot length is 2.0cm.

Improve the intrinsic quality of the package

The inherent quality problems of the package are mainly the occurrence of bites, small scorpions and whitening, etc., which are generally caused by tangled hairiness, retraction of yarn after severing, snoring, repeated suction of large nozzles, etc., and the most fundamental reason is The difference in twist is large and the stability of twist is poor. In order to improve the intrinsic quality of the package, the following measures can be taken.

Reasonably select the winding speed and tension. The dyed fiber is easy to generate static electricity during the production process. The higher the winding speed, the larger the static electricity, the more severe the damage of the yarn and the dryness of the yarn, the more hairiness of the yarn, the tangling of the hairiness, and the formation of the bite. In addition, the winding tension is also a major factor affecting the break. Therefore, in actual production, the winding speed and tension should be adjusted repeatedly to make it optimal.

Stereotype processing. In order to reduce the bite and small tweezers caused by snoring in the production process, the stability of the cop is mainly improved. Steaming yarn heat setting and tube yarn placement can be carried out for 20 to 24 hours, followed by winding. For different varieties, different stereotypes are adopted to promote the balance of fiber stress under unbalanced tension to stabilize the twist and reduce the shrinkage, so as to prevent unevenness of the twist and generate small braids due to yarn retreat in the winding. Kinking interference. After the stability of the pipe yarn is increased, the car is produced again, and the bite of the cheese yarn and the small tweezers can disappear.

Control the yarn return rate

For semi-worsted yarns with high grade and high price, it is very meaningful to control the yarn return rate of the automatic winder. The following measures can be taken to reduce the yarn return.

Choose a reasonable tank reversal speed. In the case of ensuring that the error rate of the large nozzle is as small as possible, select a reasonable reversal speed of the trough to minimize the amount of retraction. The reversal time of the trough is certain, the higher the reversal speed is, the longer the suction yarn is, the more the yarn is produced; the lower the reversal speed, the shorter the suction yarn, the less the yarn is produced, but the error rate of the large nozzle is correspondingly increased, and the production is increased. Efficiency has declined. Practice has proved that in order to keep the yarn return rate to a minimum, it is necessary to achieve a balance between the drum reversal speed and the upper suction yarn failure rate.

Clean the anti-torsion rod cylinder clamp back to the flower. The anti-torsion rod cylinder clamp return flower will directly cause the anti-torsion rod movement to be in place, the yarn yarn end pressure is not tight, and the small suction nozzle absorbs too much yarn during the splicing process, and the yarn return waste is large. The cylinder should be removed one by one to remove the flowers one by one, and grease the inner wall of the cylinder to ensure its good function. In addition, adding a felt pad to the outside of the anti-torque cylinder can effectively reduce the returning flower entering the cylinder.

Adjust the anti-twist brush spacing. The anti-twist brush spacing refers to the horizontal distance from the fur point of the brush to the lifting frame of the balloon rupture device. If the distance is too large, the small nozzle will absorb too much yarn; and this distance is too small, small suction The mouth is easy to break the yarn, affecting the success rate of the splicing, resulting in repeated joints, and the waste of the yarn is more wasteful. It should be adjusted repeatedly to make it the best.

Reasonably configure process parameters. The automatic winder has a strong function of catching and catching the cockroaches. Under the premise of ensuring the quality, the process parameters should be reasonably configured as much as possible to improve the operation efficiency of the equipment, reduce the production cost and save the yarn.

Jiangxi Donghua Machinery Co., Ltd. specializes in the production of polypropylene spinning machine, polypropylene strong spinning equipment, polypropylene high-strength spinning equipment, polypropylene spinning machine, polyester spinning machine, aramid 1414 fiber spinning equipment, DHP419 series high-strength polypropylene Spinning drafting machine, polypropylene spinning machine, DHP418 series polypropylene spinning drafting machine, DHkv1235-12 type polyester spinning machine, DHPE high-strength high-modulus polyethylene fiber spinning equipment, DHTA type aramid fiber 1414 fiber spinning equipment, HDZF3 High-vacuum dynamic drying-solid-phase viscosifying machine, polypropylene spinning machine.

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