The Study On Ring Spinning Process Of Calotropis Gigantea Fiber

As a new kind of green environmental and natural cellulose fiber,calotropis gigantea fiber has good luster,light in weight,slippery feeling,good moisture absorption and excellent heat preservation.However,there are rare reports about its daily use like garment and decorative textiles.The characteristics of fiber and the immaturity of its planting technology are the main reasons that limit its application and development.The features of large difference in length,low fiber strength,breaking easily and small cohesion among fibers,all of these features make the production process of calotropis gigantea fiber yarn more difficult and limit the development of calotropis gigantea fiber in textile.In this paper,the spinning process of calotropis gigantea fiber has been researched and some problems has been solved based on the characteristics of calotropis gigantea fiber and some preliminary study by reseachers.The research about the application of calotropis gigantea fiber will meets the requirement of costumers.The specific content of the research is as follows:Firstly,the calotropis gigantea fiber basic properties were tested and manufacture parameters were chosen based on the basic properties.The test results show that the strength of calotropis gigantea fiber is weak and the maximum static friction coefficient of fiber is small.Secondly,some problems have been solved in the spinning process of calotropis gigantea fiber,such as web broken and spinning entanglement.Finally,the spinning process could be done successfully.However,the test results show that the strength of yarn and the evenness of yarn was still too poor,both of them could not meet the requirement of knitting.Thirdly,in order to improve the properties of the yarn,the process optimization of carding has been done.In this process,the problem of web broken was solved by sliver machine.By a single factor experiment,it was found that the barometric pressure,the rotating speed of the rotor and the rotating speed of the carding roller of the sliver machine had a significant effect on the quality of the silver.Through the analysis,the optimum parameters have obtained: the barometric pressure is 0.7Kpa,the rotating speed of the rotor is4500r/min,the rotating speed of the carding roller is 2000r/min.Fourthly,in order to improve the properties of the yarn,the process optimization of spinning has been done base of carding.Through the orthogonal experiment,three single factors(twist coefficient,nip gauge and draft multiple)have been discussed.By the range analysis and variance analysis,I could obtain the optimum parameters: twist coefficient is 365,draft multiple is 1.05 and the nip gauge is 4.5mm.Fifthly,through the optimization of the spinning process,the comprehensive properties of the yarn has not yet met the technical requirements for knitting.Therefore,a variety of new spinning methods were used to improve the overall performance of the yarn,such as siro-spinning,compact spinning and compact siro-spinning.By testing the yarn properties,it was found that the breaking strength,variation coefficient of yarn breaking strength and variation coefficient of evenness for compact siro-spun yarn meet the technical requirements.Finally,because of the large cavity of calotropis gigantea fiber,the diameter of pure calotropis gigantea fiber yarn is larger than that of cotton yarn in the same linear density,The twist coefficient of cotton yarn could not accurately represent the twisting degree of pure calotropis gigantea fiber yearn.Therefore,through the theoretical derivation,the correction coefficient of twist coefficient for pure calotropis gigantea fiber yearn is 0.8465.