Three Magic Weapons To Reduce Yarn Hairiness

It refers to the fiber protrusion that extends the surface of the yarn substrate.

With the improvement of textile quality and the widespread use of shuttleless looms, the harm of yarn hairiness is increasingly prominent.

Such as weaving high density fabric causes the opening of the warp is not clear, causing false suspension, three jump and other defects.

Shuttleless weaving often results in stopping the weft insertion, and when the hairiness is small, the fabric is smooth, smooth and clear.

Many hairiness, especially uneven, will appear weft, streaks and cloud spots.

Yarn hairiness has become an important factor affecting the quality of fabric production. Therefore, effectively reducing yarn hairiness has become a focus of textile enterprises.

Method 1 adjusting equipment and process to control yarn hairiness growth.

Due to the recent continuous high temperature and low rain, the winding workshop temperature of the company is high and the humidity is low, and the hairiness growth rate of 3mm is even higher than 4.18 times. Therefore, under the condition of ensuring the winding forming and hardness, the company reduces the statistical tension of the winding hairiness as much as possible, from 120cN to 100cN. Under the condition of guaranteeing the completion of production, the lower winding speed is reduced from 1200 feather feather index Hm/min to 1000m/min.

Equipment adjustment: in

The platform implements high standards and strict requirements for vehicle cleaning, and shortens the cycle to 15 days (formerly 30 days).

Do a good job of temperature and humidity records, so that the quota, timing (by shift monitor): every 2h check and make good records; pay attention to the maintenance of temperature and humidity meter (regularly add water and replace wet gauze head gauze absorbent gauze, ensure that comparison table 1 and table 2 find: Yarn yarn yarn hairiness index is also correct than temperature and humidity), so that humidity control between 60~65, lower than normal, but the cone yarn yarn hairiness index H value has increased a lot, 60 hours to sprinkle water humidification, higher than 65 is to stop humidification.

And it is on the rise.

Sprinkler methods and specifications: before the sprinkler, clean the floor. Do not sprinkle lightly and sprinkle the water. It is strictly prohibited to pour the water directly onto the ground. The water should be sprinkled in the middle passage and the machine.

Mao Yu improved significantly: 1mm Mao Yu's H value was 29.2; 2mm Mao Yu H value was 4.6; 3mm Mao Yu H value was 0.77.

For control

It is also necessary to make further research on the physical index of roving and the choice of the ring traveller and the collar and the recession period of the ring traveller.

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Moisture regain of roving.

In the production process, the friction between fibers and fibers, and the mechanical surfaces can easily cause static electricity. When the fibers are charged with isoelectric charges, they repel each other, causing the fibers to not hold each other, causing the fiber ends in the yarn to expose due to static electricity and increase yarn hairiness.

The roving twist factor has a certain effect on yarn hairiness.

The coefficient of twist is too small. Roving is easy to appear in the winding and pportation process. The more fibers that appear on the roving surface, the greater the probability of hairiness in the spinning process.

In order to reasonably control the H value of yarn hairiness, it is suggested that the service life of domestic bearing steel collar should not exceed 30 months, and its hairiness value will deteriorate seriously after 30 months.

Controlling the yarn hairiness and its growth is a systematic project. We must strengthen the control of the physical indexes before roving, such as the moisture regain and twist coefficient of roving, the temperature and humidity of the yarn, the tension and speed of the winding and so on. We should make a comprehensive adjustment from the process, equipment and operation, pay special attention to the quality of the basic work of the equipment and operation, pay attention to the effect of temperature and humidity on the yarn hairiness growth fundamentally, so as to control the yarn hairiness index in all directions.

Method two control sizing equipment and process to reduce Mao Yu

Shaanxi Wuhuan (Group) Limited by Share Ltd Du Shengying, Yang Xiaoling, Liu Sixi

The control of warping hairiness increase is closely related to the overall performance of warping machine. The following points are good for reducing warping hairiness.

There is no abrasion on the yarn passage, including tension sowing, stopping frame guide yarn hook, guide bar, retractable reed gear and so on.

A warping machine in our company has been seriously damaged due to its peel off from the electroplating layer of the tension plate, resulting in a high breakage of the sizing yarn, a severe breakage of the fabric, and a serious opening.

Therefore, we should promptly replace the defective menopause pieces and other parts in the circuit inspection, and make regular replacement for the production of pure polyester machines.

The relative humidity is controlled by standard and the experience value is 58% to 65%.

The value of the lathe operator meets the requirements of inspection according to the operation method, requiring the production site to be well cleaned, all parts of the bobbin frame, and no belly flowers.

In addition, increasing yarn strength and reducing hairiness by sizing is particularly important for fine size and high density varieties, which are easy to produce two hairiness due to rip, and increase the broken ends and directly affect the quality of the weaving shaft.

Sizing quality is directly related to sizing process parameters, sizing formulation, equipment status, and lathe operation level.

The degree of equipment integrity is closely related to the quality of the slurry shaft, especially the key process components, such as pressure roller, sizing roller, gas path, drying cylinder, tension system, etc. the quality of the slurry shaft often fluctuates greatly due to equipment failure.

For example, the aging of the press roller, especially the micropore pressure roller, when the time is too long, the surface rubber aging and micropore blockage will cause the hardness to change, reduce the amount of slurry, or the knife marks are serious, and wear marks on the surface of the roller can cause the problems such as small sizing, uneven sizing and bad hairiness. It will affect the quality of the slurry shaft and produce many defects. It should be periodically replaced (at present, the mill cycle is mostly half a year, and our factory is 3 months), so as to maintain its good condition.

Generally speaking, when the grouting force is constant, the sizing speed is high, the size of the sizing roller is large, the pressing time of the sizing roller is short, the sizing rate is too large, the sizing is mainly, but the permeability is insufficient. When the yarn is divided, the yarn will be increased by Mao Yu due to the tear. When the speed is too small, the yarn size will be less, the pressing time will be longer, the sizing rate will be small, the sizing penetration is insufficient, and Mao Yu will not be effectively stuck, and the number of Mao Yu will still be very high.

Therefore, the sizing speed should be reasonably set according to the varieties of warp, slurry composition, slurry viscosity, drying temperature and so on, so as to avoid low and excessive vehicle speed, reasonably control the degree of penetration and control the yarn hairiness in a reasonable range.

The large pulp strength is good for sticking long hairs on 3mm and above, but not on short hairiness of 2mm. This is because the stiffness of short hairs is larger than that of long hairs, and the hairiness is not easy to lodge.

As we all know, technology is the core, operation is the key, equipment is the foundation, reducing the yarn hairiness and improving the quality of weaving spindle are three indispensable, but we should excavate and give full play to the basic role of equipment in technological research and operation innovation, and constantly adapt to the needs of variety development through technological pformation and management maintenance.

In equipment management, besides careful implementation of the flat car system, attention should also be paid to routine inspection and maintenance. For key process components such as sizing rolls, periodic grinding or replacement should be carried out to ensure that the equipment is in good condition, which is the key to achieving technological goals and stabilizing product quality.

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Method three use removable balloon control ring.

Zhu Feifei, Zhong Zhili, Guo Huan, School of textile, Tianjin University of Technology

Wang Xun, fiber application innovation center of Deakin University

Spinning hairiness will have adverse effects on spinning process, and will also cause some defects. The balloon control ring divides the larger air ring into 2 smaller air rings, and maintains stable and normal gas figure under smaller spinning tension, thereby reducing the degree of friction and the number of collisions between the air ring and the spacer plate, and significantly reducing the yarn hairiness.

The movement form of the balloon directly reflects the spinning tension, affects the yarn's evenness and broken ratio. After the balloon control ring is added, the shape of the balloon is relatively stable, which improves the yarn quality and reduces the breakage rate.

At present, domestic cotton spinning frames seldom use air ring, but with the development and application of high-speed spinning and spinning doffer, it is imperative to configure air ring on ring spinning frame.

The balloon control ring divides the larger air ring into 2 smaller air rings. The pposition spinning is that the spindle does not spin at its corresponding front roller position and can maintain stable and normal gas figure yarns under the small spinning tension while spinning at the adjacent front roller position. The spinning principle is to pass through the state, thereby reducing the degree of collision and friction between the air ring and the spacer plate, and changing the twist triangle between the drafting unit and the twisting winding unit to change the twisting triangle to significantly reduce the yarn hairiness.

The motion form of the balloon directly reflects the shape and size of the spinning, so as to better control the yarn tension in the twisting process, affect the yarn's sliver and breakage ratio, and add the balloon control movement to make the yarn structure change, so as to achieve the purpose of improving the yarn quality.

However, the pposition spinning adds yarn to the spinning path and the encircling radius of the guide hook, which makes the spinning tension increase, the instability of the balloon shape, and also aggravates the trapping effect of the yarn guide hook. These factors will increase the weak section of the spinning section, which will easily cause the accidental elongation of the yarn, thereby increasing the coarse section and detail of the yarn.

Therefore, we should make full use of the advantages of pposition spinning to improve yarn hairiness, and try to avoid the deterioration of strip and the increase of broken ends.

A new idea is put forward in this paper, which is to install a movable air ring control ring on the basis of pposition yarn path.

The addition of a movable air ring control ring can reduce the hairiness of the yarn very well. This is because the balloon control ring not only makes the yarn balloon form divided into 2 smaller air rings from a larger air ring, but also makes the shape of the air ring always divided into 2 circles with nearly equal height, and the tension fluctuation is also reduced to a minimum. This makes the yarn shape of the output roller to the yarn guide hook stable, the centrifugal force of the yarn outward movement decreases, and the outward pfer of the yarn decreases, so that the yarn hairiness is reduced to a certain extent.

On the other hand, the shape of the balloon is stable, which reduces the degree of friction and the number of collisions with the spacer plate, and further reduces the yarn hairiness.

Practice has proved that under the condition of high-speed operation of the ring spinning frame, the movement of the balloon is one of the main reasons for the increase of the broken ends. This is mainly manifested in the high speed, the movement of the balloon is significantly deviated from the scope of work required by the normal balloon (2), so that the tension of the yarn increases significantly, and the balloon lacks a certain elasticity, which weakens the ability of the yarn itself to bear the tension change.

The movable hairball control ring reduces the hairiness reduction rate of the normal yarn path by more than 20%; while for the pposition yarn path, the yarn hairiness of the left commutator spinning is significantly less than that of the right pposition spinning, and the moveable gas ring control ring reduces the hairiness rate of the left pposition spinning 19.53%, while the hairpin reduction rate of the right pposition spinning reaches 30.56%.

When spinning fine tex yarn, the yarn hairiness of the pposition yarn path is obviously smaller than that of the normal yarn path.

This is mainly due to the change of the shape of the twisting triangle area by the pposition yarn path, thus increasing the pre tension of the yarn in the yarn.

After adding the movable air ring control ring, the yarn hairiness of the 2 yarn paths decreased significantly.

The movable balloon control ring can stabilize the shape of the air ring, reduce the yarn hairiness caused by the friction between the air gap and the spacer plate and the increase of centrifugal force.

On the basis of pposition spinning, adding movable air ring control ring is a kind of spinning method that is worth popularizing and reducing hairiness.