The rubber roller directly affects the yarn quality sig […]
The rubber roller directly affects the yarn quality significantly. The spinning performance of large diameter rubber rollers is better than that of small diameter rubber rollers. This is because under the same pressure condition, the larger the diameter of the rubber roller, the greater the contact area between the rubber roller and the roller. Larger, the control of the fiber is strengthened. This is because the friction area generated after the contact area between the rubber roller and the roller is increased, the active area of the floating fiber is reduced, the shift point is shifted forward, and the yarn is The dry CV value is therefore improved. The larger the diameter of the rubber roller, the more sufficient and stable it is to hold the sliver during the drafting process. The yarn quality of the large diameter rubber roller has been significantly improved. It is recommended that large diameter rubber rollers be used in production, and it should not be used. For rubber rollers whose surface hardness is too high, soft rubber rollers with a surface hardness of about 65 degrees Shore hardness are usually selected.
It can be found that during the spinning process, the number of fibers with a controlled cross-section in the draft of the front area is small, so the control of the fibers in the spinning zone is concentrated on a limited cross-section, which has a strong control over the state of fiber movement. Therefore, changing the size of the draft in the front zone has a relatively small effect on the yarn uniformity of the yarn. In the experiment, we focused on how to optimize and configure the process of the draft in the rear zone.
The reasonable configuration of the back zone drafting process parameters has a greater impact on yarn quality. At present, small back zone draft multiples are commonly used in production. The weaving yarn back zone draft ratio is generally 1.20 to 1.40 times, and for knitting. The draft of the yarn back area is generally 1.04 times to 1.30 times. The center distance of the back rollers used in this article is 55 mm, the diameter of the middle and rear rollers is 25 mm, the distance between the middle and rear rollers is 30 mm, and the roving twist factor is 114. The yarn obtained by this process is not only good for the sliver. It can also reduce the changing time of workers in the workshop; when the draft of the back zone changes within a small range or the cotton fiber length changes little, there is no need to adjust the separation, which is convenient for daily production management.
As the draft multiple in the back zone becomes smaller, the yarn dry CV value tends to decrease first and then increase. The draft multiple in the back zone is directly related to the fixed drafting gear of the spinning frame itself. Actual production should be based on Different types of spinning frame configuration and roving twist factor are reasonable to select the draft multiple. Generally, it is recommended to choose a smaller rear draft ratio in actual production.