Hairiness is mainly formed in the spinning process and increases in the winding process. Yarn hairiness forms are complex, such as end hairiness, loop hairiness, and floating hairiness. Among ring spinning hairiness, end hairiness is the majority. Controlling the main factors that affect hairiness in the spinning process and reducing the formation of hairiness are the keys to solving the problem of yarn hairiness. Usually, the spinning process, mechanical conditions, human operations, and workshop temperature and humidity have a great impact on hairiness.
1. Spinning Technology
1. Spinning yarn twist coefficient
Spinning yarn twist coefficient increases appropriately and hairiness is significantly reduced. Because the twist coefficient increases, the twisting moment of the fiber increases, and the twist transmission is closer to the front jaw, which increases the binding force on the fiber in the twisting triangle area and reduces the number and length of the fiber extending out of the yarn body, thereby reducing Hairiness. But when the twist coefficient is particularly large, the number of hairiness increases sharply as the twist coefficient increases.
2. Total draft ratio
The number of hairiness shows an upward trend as the total draft ratio of spun yarn increases. Within a reasonable range of the spinning draft multiple, the hairiness does not increase significantly; the total draft multiple increases, and when the draft multiple of the rear area remains unchanged, the draft multiple of the front area increases, and the number of sliver fibers entering the front area increases. The number of floating fibers increases. At the same time, the linear speed ratio of the front and middle rollers expands, and the acceleration from slow fibers to fast fibers increases. The fiber movement is unstable, and the free fibers at the head end that enter the twisting triangle are not affected by the acceleration. The twisting torque is controlled, and the yarn cannot be rolled into the yarn body to form hairiness, and the number of hairiness increases.
3. Front rubber roller position
The forward movement of the front rubber roller increases and the hairiness of the spun yarn decreases. Because the front rubber roller moves forward, the enclosing arc on the front roller of the beard is reduced, making the twisting torque closer to the front roller nip, and strengthening the ability to control the fibers in the twisting triangle area. However, if the forward movement is too large, the hairiness reduction effect will not be obvious. Generally, the forward movement should be controlled at 2-3mm. In addition, appropriately increasing the diameter of the front rubber roller, such as increasing it to 30mm, can increase the ability to control loose fibers.
4. Front and rear drafting processes
The drafting process of the front and rear areas should follow the principles of small floating area length, small jaw spacing, and small roller center distance in the front area; large roller center distance, large roving twist coefficient, and small draft multiple in the rear area.
5. Spindle speed
If the spindle speed is high, the yarn will be affected The centrifugal force is large and the hairiness increases. Therefore, for varieties with higher hairiness requirements, the spindle speed should be appropriately controlled at a low level.
2. Equipment status
1. During twisting and winding, if the parts are not smooth, or are repeatedly stretched and relaxed during post-processing, or rub against the yarn guide hook, hairiness may easily form.
2. The rubber roller has high hardness and good surface finish, which can effectively reduce hairiness.
3. Increase the weight of the wire ring appropriately to reduce hairiness.
4. The decayed steel rings must be polished, ground back, scrapped, etc. in a timely manner; the diameter of the steel rings should be reasonably determined.
5. The frequency conversion speed regulation technology of the spinning machine can appropriately reduce the spindle speed in the small yarn and large yarn stages, and reduce the spindle speed in the medium yarn stage. Appropriately increasing the spindle speed can reduce the hairiness difference between different yarn segments.
6. Choose appropriate caliber cotton collectors, internal and external pattern rubber rings, pressure rods, nylon upper pins, and some new lower ones. Pins (such as modifying the shape of the top surface) are helpful in reducing fly and hairiness.
3. Human operation
1. The operator strictly implements the operation method of each yarn channel and strengthens cleaning, which can effectively reduce the increase of hairiness.
2. When cleaning the machine, the operator does not slap or tap the spinning section with a brush to prevent flying flowers. Attach to reduce hairiness formation.
3. Pay attention to equipment maintenance, repair problems in a timely manner, and keep the equipment in good condition.
4. Use antistatic agent rationally. Spray the antistatic agent on the roving and let it rest for 24 hours before spinning to reduce the fiber content. repulsion, thereby reducing hairiness.
4. Workshop temperature and humidity
The humidity in the spinning workshop is controlled to be high, which can increase the moisture regain of semi-finished products and reduce hairiness. </p
