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Fiber differentiation is the general trend of synthetic fiber development , profiled fiber is one of the most important technologies of the chemical fiber differentiated technology . Compared to Japan, the U.S. and other developed countries , China 's chemical fiber industry present in an amount of weight to light weight problems , differentiated and low profiled fiber new product development, mainly through the analysis of foreign products , and a large number of test spinning in quality and quantity are lagging behind developed countries abroad . The main problem lies in the lack of theory profiled fiber . Therefore , the subject will be focused on the theory profiled fiber forming . This thesis analysis profiled spinneret micropores composition , micropore mainly constituted by a circular, rectangular, annular unit , complex profiled microporous rheological status can be based on a basic unit of rheological theory the basis of the analysis ; profiled spinneret microporous basic unit in the polymer melt flow equation is derived . Secondly , for the polymer melt from porous spinneret extrusion , melt trickle spun fiber spinning process , flat rectangular spinneret microporous spun the section fiber unit , the continuity equation simultaneous equations of motion , the energy equation and constitutive equation , the establishment of a mathematical model of the dynamics of the flat section fiber spinning ; accordance with section deformation process of the profiled fiber surface area reduction caused by the energy difference between the system with flow escape of energy conservation , the mathematical model of a a profiled fiber cross-section deformation dynamics . Then, for the first time the spinning dynamics simulation of the cross-section deformation dynamics model combined profiled fiber spinning model , the impact of the fiber profile degree spinning process parameters by theoretical analysis as follows : ① polymer properties viscosity , porous spinneret shape , size and design profiled degrees ; ② cooling hair starting
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