Abstract: 【Objective】An integrated fiber-quality index model (IFQI) with the cotton fiber qualities which can directly express cotton fiber integrated quality and spinning yarn quality was studied.【Method】Based on the experimental data of spinning yarn, the data of cotton fiber qualities were analyzed by using the principal components.【Result】(1) The single yarn strength is the principal index in kinds of quality indexes which influence yarn strength. (2) The cotton fiber qualities are crucial factors to spinning strength. Though different spinning yarn techniques lead to different raw cotton strength, but the spinning yarn's strength trend is not changed because of the spinning yarn technique. Thereby, whatever the spinning yarn technique is, the cotton fiber qualities are better, their spinning strength is stronger. (3)The fiber length, fiber strength, micronaire and uniformity are the pivotal indexes expressing IFQI . All of the above results are the basic knowledge to build up the models of IFQI. According to spinning consistence index, spinning yarn strength, spinning yarn integrated quality, was the best chose. As the models of IFQI has quite a lot of advantages like explicit mechanism、few independent variables、simple and intuitionist, and also the integrated fiber quality index had a positive correlation with yarn strength and spinning consistence index. In addition, the model of the relationship between IFQI and SCI was established as: SCI=0.3684×IFQI+35.588.【Conclusion】It is concluded that IFQI is the shared reference index for the testing of both cotton fiber of the Ministry of Agriculture and the Ministry of Spin Industry. Moreover, it can greatly reduce workload of testing cotton fiber.

Key words: Fiber character, Integrated cotton fiber quality index, Cotton yarn qualit, Single yarn strength, Model