The Research Of The Yarn Hairiness During The Winding Process

The yarn hairiness is an old and young project, in the 1930's~1940's of the last century, it had been researched widely, and the yarn hairiness had become an important index which described the quality of the yarn in 1950's~1960's. Recently, with the increasing of the demand on the yarn and fabric quality, the hairiness had become a disadvantageous factor which block the development of the fabric quality in our country, and at the same time, the hairiness was also the problem cared by many researchers at home and abroad. At present, the biggest advantage of the different type compact yarn machine, existed in the market, is low hairiness, so it can increase the effect of the back process, and the quality of the yarn and semi-product, and then increase the fabric's quality.Many references provided by the researcher at home and abroad had shown that the winding process was the most serious process that would cause the hairiness to increase largely, too much hairiness would influence on the fabric appearance and processing, so how to control the hairiness in winding process was the key process to decrease the hairiness of the yarn. The previous research was mainly focus on the influence of winding velocity, winding tension, and the bobbin's unwinding point on the yarn hairiness, the application of the hairiness decreasing equipment, but the main result come from the experiment, and the mechanism of hairiness increasing in winding process was not be explained better in theory. It had shown that the hairiness increasing of the different yarns was not the same even if they were winded in the same condition, and if the same yarn was winded in different condition, the hairiness increasing would change obviously or change little sometimes, so these phenomena hint that there is some reason that cause the hairiness increase during the winding process, and it must be helpful to explain the phenomena in the produce or experiment if we find it. The previous hairiness decreasing equipment had some shortcoming so that its advantage can't be exerted entirely. This project will mainly focus on the research of the hairiness increasing mechanism and the development of the hairinessdecreasing equipment, so this project will research the content as follows:1. Discussing the relation of the frictional mechanism of different type yarn with the yarn hairiness.2. Analyze the force born by fiber on the base of the yarn structure theory, and explain the increasing mechanism of the yarn hairiness in theory,3. Exploiture a new hairiness decreasing equipment that should conquer the previous shortcoming, and provide a viable technical method combined with the winding process according the situation of the factory.This dissertation will use the frictional theory, the yarn structure theory and the balloon theory to research these three content. After these three theory are used to the winding process, we can learn the conversion of the friction mechanism during the friction, the hairiness increasing mechanism because of the hairiness being pulled out, and the shortcoming of the previous hairiness decreasing equipment. The conversion of the friction mechanism is brought forward firstly, that is fluid friction will be converted to boundary friction or semi-boundary friction, combining the yarn structure theory with hairiness is a new which extend the use of the yarn structure theory, and the theory is accepted by the original journal of SCI, at the same time, the asymmetry hairiness decreasing equipment introduced in this dissertation can increase the effect of decreasing hairiness, and it has been applied for a patent. The influence of the structure parameter of the hairiness decreasing equipment has be discussed, and the result can be used our country's factory.