Analysis Of Combing High Quality Production Method

This issue is for Huarun Liaocheng, Shandong. Spin Relevant production experience of limited company and Jiangsu Kai Gong machinery Limited by Share Ltd is introduced.

Method 1

Reasonable configuration parameters to reduce fiber damage caused by equipment

Zhang Lingbin, Liaocheng Huarun Textile Co., Ltd.

With high speed Comber It is inevitable for comber to damage fibers. According to many years of production practice, the author thinks that taking measures from the following aspects can effectively reduce the degree of fiber damage.

First, increase the straightness of the sliver. from fibre The hook extension theory shows that the extension effect of the rear crooked hook increases with the increase of drafting multiple. Therefore, properly increasing the web tension of the doffer to the press roller helps to reduce the back crooked fibers in the cotton web and improve the fiber straightness of the sliver.

Second, reasonable allocation of pre drawing drafting process. In order to fully eliminate the front crooked hook, the main draft should be controlled below 3.3 times, the rear area drafting is 1.75 times ~2 times, the total draft 5 times ~6 times, and the number of roots 5 ~6 roots. The larger the draft distance is, the larger the distance between the fiber shifting point and the front jaw can be reduced, and the preloading speed can be reduced appropriately, and the extension time of the front crooked hook can be prolonged.

Third, reasonable allocation and rolling process. The shape of sliver hooks is mainly crooked crooked hooks. Therefore, the process should adopt more combined numbers as much as possible, increase the total drafting multiplier and improve the fiber straightening degree. At the same time, the initial pressure and the gradual increase of the pressure of the small coil should be reasonably set to avoid sticking.

Fourth, reasonably choose the working angle, hardness and tooth density of the first row of needle teeth in Xilin. The working angle should not be too small, and grasp at 60 degrees or so, so as to facilitate the needles to pierce the plexus and to pre open the loosening. The hardness of the needle teeth should be above HV800, so as to reduce the broken needle and the crooked needle, avoid the damage to the fibers caused by the small cross section of the needle teeth and the small gap of the teeth. The tooth density should not be too large, and should be mastered in 25 teeth / centimeters to the left and right to reduce the damage to the fibers.

Fifth, choose the cylinder speed reasonably. The carding speed of the cylinder at constant speed is decreasing during the whole carding process, that is, the first comb speed of the first row of needle teeth in Xilin is the largest, so the cylinder speed should not exceed 350 tweezers / min.

Method two

Optimizing mechanical mechanism to increase CV value of combing sliver

Jiangsu Kay palace machinery Limited by Share Ltd Zhang Libin

In actual production, many enterprises often encounter increasing combing efficiency by increasing the speed of comber, but the combing strip index is deteriorating. Especially in traditional combing machines, when the speed is increased to 400 times per minute, the evenness will deteriorate to varying degrees. We have optimized the main mechanism or parameters on the JSFA388A comber, and carried out the spinning test, analyzed the relationship between the transmission mechanism and the CV value of the combed stem, providing reference for the combing strip quality control and comber technology transformation.

Through experiments, we found that the technical measures to improve the evenness of JSFA388A comber mainly include the following aspects.

First, when spinning long staple cotton and fine staple cotton, the evenness of the cotton web is 1.75 and 1.25 respectively. Therefore, the production scale of cotton web should be based on the scale. raw cotton fabrics The length is adjusted near the better position. The principle is that the length of the main body of the fiber decreases and the direction of the scale is smaller.

Second, after optimizing the design of the separation roller mechanism, the lap ratio of the cotton bushes increased by 6.77 percentage points. When the combing speed was 400 clamp times / minutes, the CV value of the combed sliver decreased from 3.87% to 3.32%. The separation roller movement law was more reasonable, and the motion speed and acceleration correspondingly decreased, and the running stability of the whole machine was also improved.

Third, the combing machine adopts three upper five lower curve drafting mechanism, and the combing sliver can maintain a good level when the combing speed is less than 400 times / minute and the drawing ratio is small, but the adaptability to the high speed is poor. Three the upper and lower three pressure bar drafting mechanisms can more effectively control the fiber speed change points, improve the combing sliver, and are more suitable for the combing process of heavy weight, high speed, large draft and forward cotton.

Fourth, improving the sliver conveying mechanism and adjusting the location of the guide bar nails reasonably will help to eliminate overlapping mechanical waves and improve the evenness.

Method three

Control temperature and humidity and reduce carding droppings reasonably

Shandong Liaocheng Huarun Textile Co., Ltd. Liu Yunguang

Faced with today's market crisis, Spinning enterprise The profit space has been seriously squeezed by many unfavorable factors. The cost of raw cotton has accounted for more than 70% of the total cost. Under the premise of ensuring the quality of the yarn, only the combed noil rate can be reduced scientifically and reasonably, so that the profits of the enterprises can be better improved.

Different temperature and humidity have a great influence on cotton fiber processing. When the temperature and humidity are low, the actual water vapor content in the air is low, the air is dry, the fiber is fragile, the process is easy to break and damage, and it is easy to generate static electricity, and the number of flying flowers is increasing. Repeated tests showed that when the temperature and humidity were low, the percentage of combed cotton droppings increased by 1~1.5 percentage points. Similarly, the control of temperature and humidity can not be too high, because when the air is too wet, the effect of removing neps impurities is reduced.

It is worth noting that the temperature and humidity regulation of combing process can not be one-sided pursuit of temperature and humidity indicators, not only for temperature and humidity indicators, but should be combined with the actual effect of production to master. In fact, when the temperature is high and the relative humidity is low, the moisture content is not necessarily low, and the temperature is not related to the moisture content. They represent the two independent parameters of the air. In the high temperature and high humidity season, the air is very humid, the raw material moisture regain is higher, and the appropriate temperature increase can reduce relative humidity. During the spinning process, the moisture regain of the semi-finished products should be controlled, and the combing process should be gradually lowered from the sliver to the combing process, so that the combing process is in a state of moisture release. This will not only help comb production, but also reduce the fluctuation of the noil rate and stabilize the yarn quality. When the amount of water vapor in the air is too high, the relative humidity can be significantly reduced by raising the temperature greatly. At this time, although the temperature and humidity data are still changing on the moisture content line such as I-D diagram, there is still a possibility that the production can not be produced normally, and may cause the bigger fluctuation of the noil rate of comber. Therefore, it is necessary to install a set of dehumidifier equipment in the high temperature and high humidity season and improve the dehumidification capacity of the combing room.