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Expose The True Face Of Staple Fibers In Raw Cotton

2013/3/16 8:55:00 42

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Yarn Quality Staple Fiber Textile Industry

< a > href= > http://cailiao.sjfzxm.com/Matertial/show/default.aspx > cotton short fiber > /a > concept: 
 cotton seed skin coat generally has a larger density. During the growth process, its growth time and growth rate are not exactly the same, thus forming different lengths of raw cotton fibers. Among them, raw cotton staple fiber is especially the length of fiber in the raw cotton length below a certain limit value. It is also commonly referred to as short fiber. Short fiber content or short fiber percentage refers to the weight percentage or fractional percentage of these raw cotton staple fibers or short fibers relative to all fibers. However, at present, the boundaries of raw cotton staple fibers have not yet been completely standardized in the world. For example, in the United Kingdom and Switzerland, the raw cotton fiber that is lower than the average fiber length is commonly referred to as short fiber. The United States defines the fiber length below 12.7mm as short fiber, etc. in China, the fiber length below 16mm is usually referred to as short fiber. 
 cause analysis of raw cotton staple fiber 
 to explore the causes of raw cotton staple fiber, so as to provide guidance for formulating relevant measures to control and reduce short staple fiber, and ultimately provide more high-quality raw cotton for China's textile industry, while improving the quality of export yarn and enhancing the international reputation of products. Specifically, the causes of short staple fibers can be roughly summed up as follows: 
 1. cotton varieties. Under normal conditions, the average length of raw cotton is the same as that of cotton varieties, but there will be some differences in cotton varieties. Generally speaking, the better the cotton varieties, the raw cotton fibers are relatively longer. For example, the average fiber length of the cotton 6 is 31mm, and the average length of 28mm is 14. It is particularly necessary to point out that cotton is a crop that is prone to natural miscellaneous crops. In addition, people will inevitably mix up in farming. They can reduce the purity of cotton seeds to a certain extent, and the length of raw cotton fiber after hybridization is shorter than that before hybridization. Therefore, the varieties and purity of cotton are important factors related to the length of raw cotton fiber 
 2. growth environment factors. Because cotton is a good light plant, so in many environmental factors, climate is the most important factor affecting the quality of cotton. The best growth temperature is about 26~30 C. When the temperature is below 26 C, the growth rate will slow down, and it will almost grow at less than 18 C. As far as fiber growth is concerned, if the temperature is too low at the 25~30 day of elongation, it will terminate elongation and form short fibers, and the longer the duration of low temperature, the more serious the short fiber will be. 
 3. < a href= "http://www.91se91.com/news/" > mechanical processing < /a > effect on raw cotton fiber. Because of the slight difference in structure, the strength of a single cotton fiber is different, so that some fibers will break in the process of processing. This is also one of the important ways to form short staple fibers of raw cotton. Especially in recent years, some enterprises have unscientifically pursued the low impurity content and economic benefits of the lint cotton after processing, and adopted the technology and methods of increasing the speed of the machine, processing cotton seeds and using the leather cleaning machine and so on. But in fact, these processes and methods will increase the short fiber content to varying degrees in most of the time. For example, a survey showed that the short fiber content of lint treated by leather cleaning machine usually increased by 2 to 3%. 
 4. adulteration. Driven by possible benefits, some cotton processing enterprises will once again pick up the treated cotton and return them to the lint. These dopants can even include noil, taffline and thread cotton produced by the textile mill. As the operation itself has a certain degree of concealment, and most of the adulteration process has been processed by the flower machine and lint cleaning machine, it is difficult to find out objectively when there is a lint test, so it is difficult for the relevant departments to deal with such incidents. ".
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 control and prevention strategy for raw cotton staple fiber 
 1., we preferred < a href= "http://www.91se91.com" > cotton seed < /a > to suit local conditions. For a long time, cotton seed yield, disease and insect resistance, maturity, fineness and strength have been paid enough attention by cotton farmers and related agricultural science and technology units. However, in terms of short fiber content of raw cotton, it is necessary to pay equal attention to it. In this respect, we need to start from the cultivation and selection of cotton seeds, and at the same time we should combine closely with the ecological characteristics of different cotton species. Some varieties have relatively wide adaptability to ecological conditions, but some varieties need to be able to embody their fine characteristics under specific ecological conditions. Therefore, selective planting should be carried out according to local conditions so as to control short fiber content. 
 2., standardize production and processing technology. In the process of cotton production and processing, the specific production and processing technology must be comprehensively standardized. At the same time, as far as possible to reduce impurities, rigid valves and other defects, we must resolutely curb the occurrence of cotton seed processing and cutting off fiber phenomenon. We should exclude the innovation of the related technology of short staple in the most important position, instead of pursuing the yield and quality unilaterally at the expense of increasing short fiber content. This paper puts forward two suggestions for the processing of seed cotton. 
 (1) control mechanical speed to reduce short fiber content. On the one hand, it is necessary to control the surface line speed of the thorns of the thorns, which is usually suitable for the range of 7m/s to 10m/s. Too fast will cause an excessive blow to the seed cotton, resulting in the short fiber falling off. On the other hand, it is necessary to control the speed of the saw roller. The speed of the sawing drum can increase the processing process and output to a certain extent. However, when the speed exceeds a certain value, it can cause the fiber to be pulled off a lot. So the speed of the sawing drum should be controlled in the range of 650r/min to 850r /min when considering the seed cotton grade and water content. 
 (2) scientific planting to protect the original fiber quality. Just like cotton maturity, intensity and color, cotton fiber length is also the main reference index to determine its spinning value. Therefore, it is necessary to classify the seed cotton of different varieties and grades so as to ensure the maximization of lint value. In addition, cotton seed cotton with severe moisture regain should be treated as dry as possible, and then cotton gin should be used. For the cotton seed with good maturity, coarse fiber and high cotton seed with cotton fiber, the short fiber content can be effectively reduced through the above measures. 
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