What are the factors that affect yarn hairiness?

Yarn hairiness refers to the fiber ends or loops that protrude out of the yarn body.

Hairiness caused the appearance of the yarn plush, reducing the appearance of the yarn luster. Too much yarn hairiness will affect the normal sizing, and in the weaving process, resulting in unclear openings and increased breakage. The amount and distribution of yarn hairiness have a significant impact on the quality of the fabric and the quality of the dyeing and printing of the fabric, and it will also cause the problem of pilling during the fabric taking process. In particular, hairiness above 3 mm will seriously affect the production of the back road, affecting the appearance, feel and performance of the yarn and its final product. Therefore, the yarn hairiness index has become an important quality assessment index.

Effect of raw materials on hairiness

The fiber length, fineness, maturity, short lint rate, impurities carried by the fiber, etc. of the raw cotton will have a direct impact on the production of hairiness during the formation of the yarn.

The higher the torsional stiffness and bending stiffness of the fiber, the more hairiness will be;

The higher the torsional stiffness and bending stiffness of the fiber, the more hairiness will be;

The finer the fiber, the more the number of fibers in the yarn section, the greater the possibility of the fiber tip exposed, and the more the probability of yarn hairiness;

Impurities carried by the fiber itself are prone to defects in the spinning process, affecting the normal operation of the whisker and straightening parallel, increasing the opportunity for the fiber to expose the yarn body and producing hairiness;

Good fiber maturity, long length and good uniformity, the fewer fiber roots per unit length, the less yarn hairiness.

In the daily production process, the quality of cotton blending and the utilization rate of back flowers should be strictly controlled to improve the consistency and stability of raw materials.

Effect of each pre-spinning process on yarn hairiness

The blender shall keep all parts in good condition and set parameters reasonably. Reduce the scratch and damage to the fiber, so as not to be broken in the process of high-magnification drawing of the fine yarn, so that the wear resistance of the yarn is poor and the hairiness is increased. Enhance the combing efficiency, while minimizing the generation of short lint opportunities, straighten fibers, reduce the formation of hairiness probability.

Generally speaking, the hairiness of combed yarn is 30% ~ 40% more than that of combed yarn. Combing eliminates a large number of staple fibers in the sliver, improves the straightening and parallelism of the fibers, and reduces the hairiness of the yarn. In the preparation process of combing, attention should be paid to reducing the phenomenon of sticking to the roll. In combing, the cotton drop should be increased appropriately, and the top comb, cylinder and brush should be kept in good working condition. The whole cotton delivery channel should be smooth and free of bristles.

Attention should be paid to drafting and distribution in the drawing process, so as to improve the straightness of fibers and reduce the formation probability of hairiness. The bell mouth cannot hang flowers. The pressure bar should be checked regularly to ensure good condition.

Roving process should be appropriate to increase the roving twist coefficient to reduce the yarn hairiness has a certain effect. At the same time, all places where tampons pass through should be kept bright and clean, and there should be no hanging flowers. The plastic cotton strip tube used in each process of pre-spinning and the cotton strip are easy to generate static electricity when they rub against each other, and the fibers repel and attract each other. Some lints cannot be normally covered to form hairiness. The plastic strip tube should be smooth and free of burrs.

Effect of Post-spinning Process on Yarn Hairiness

Spinning is the key process of spinning, and the quality of its spinning equipment has a great influence on the yarn hairiness. For example, the diameter of the steel collar is inaccurate, the roundness and flatness are poor, or there are ripples, burrs, unevenness and unevenness, the steel collar plate is uneven or deformed, and the up and down movement is not vertical. Poor fit between traveler and collar, intarsia; The thread guide hooks up the groove, friction to the yarn strip; The spindle is not allowed to center the spindle tip, etc., which will lead to an increase in yarn hairiness. Spinning spindle speed, twisting zone process conditions and equipment status, draft distribution, the size of the twist coefficient will affect the yarn hairiness.

The weight of the traveller directly affects the hairiness. The traveller is too heavy, the spinning tension is large, and the air ring is small, which increases the friction between the traveller and the yarn. At the same time, the yarn is also easily scratched to form neps. If the traveller is too light, the spinning tension is small, and the air ring is too large to cause the yarn to collide with the yarn spacer plate and produce hairiness.

The winding process is the process with the largest increase in hairiness, which is mainly caused by the friction of the parts of the winding machine on the yarn. The yarn winding speed increases with the increase of yarn winding speed, and the yarn winding speed should be selected reasonably. In the winding process, all components in the winding channel should be kept intact and smooth to avoid friction and static electricity generated during the movement of cotton yarn, resulting in an increase in cotton yarn hairiness.

Influence of temperature, humidity and other factors

In theory, humidity is one of the main reasons that affect the change of hairiness, but in actual production, due to the instability of various conditions, it is difficult to quantify its influence on hairiness. Only from long-term monitoring can we see the trend of its influence on hairiness.

If the humidity is high, the fiber volume will expand, the air permeability will be poor, the strength of single fiber will be improved, the strength of yarn will be improved under the same conditions, the friction resistance will be improved, and the hairiness will decrease. Therefore, the humidity of the processing environment will be appropriately increased in the spinning and falling process, which is conducive to the reduction of hairiness.

The friction of the yarn itself will also produce hairiness, and the tube yarn falling from the spinning frame or the bobbin yarn that has been formed will also produce hairiness in the process of unwinding, transportation and storage. Therefore, in the production process, attention should be paid to handling with care and minimizing the chance of hairiness.

For many years specializing in nylon research and development, production and operation and consulting services of high-tech enterprises. Located in the famous town of socks-Datang Town, Zhuji City, Zhejiang Province. In the more than 20 years since the "swallow" was opened, we have worked tirelessly and continuously, gradually developing from the initial 2 reloading machines to a factory with 24 nylon filament POY screws, 8 DTY reloading machines and 45 yarn rewinding machines. Daily output, POY: 20 tons, DTY: 20 tons, colored nylon yarn: 6 tons, covered yarn: 3 tons, rubber thread: 3 tons. The company strictly implements ISO9001 international quality system standards and ISO14001 environmental management system standards, and products are strictly in accordance with OEKO-TEX standards.