Research On High Polymer Flow In Spinneret Microhole And Profiled Fibers Formation Process

Profiled fiber is becoming a trendy for chemical fiber development. Compared to America, Japan and other developed countries, chemical fiber industry in China faces many problems like large quantity with lower quality, lower differential rate and production experientially. At present, the shaped fiber new product development, mainly is through the analysis overseas new product, and carries on massively experience spinning, all falls behind in the quality and the quantity to the overseas development country, and the main question lies in lacks the different shape textile fiber theory the research. This paper focuses on shaped fiber forming process and its critical technology to control profile degree.Firstly, various kinds of the shaped spinneret micro-hole form modes are investigated here. Micro-holes consist of several elementary cells, namely rectangle and circle ring. The fundamental flowing equations of every elementary cell are derived.After high polymer flowing out the spinneret pore, its degree of profile is mainly decided by the spinneret micro-hole characteristic parameters and the spinning technologyconditions during the procedure of formation.Then, the dynamic mathematical model of the flat section fiber spinning is established with the continuous equation, motion equation, energy equation and constitutive equation. Furthermore, according to conservation of energy, the deformation dynamic mathematical model is established.The spinning dynamics simulation and the cross-section deformation dynamics model are originally unified together in this work. The shaped fiber spinning forming model is also constructed. Spinning technology parameters have different effects on the degree of profile: (1)polymer intrinsic viscosity, the spinneret micro-hole form, size and designed degree of profile. (2) spinning temperature, the initial position of chilling aeratin. (3)pump quantity, take-up velocity.(4)blow-air velocity and length.Finally, on the basis of the flat section fiber formation rationale, by massive experiments, some other shaped fiber spinning forming models with the shape factor ζ are also derived here. Therefore, the optimized spinning technology route is designed. The other new fiber type like pentagonal fiber is successfully developed, while pdf and profile degree of the pentagonal fiber is only 1.5dtex and 76.3% respectively. There is not domestic report related to these fine denier shaped fibers found until now. The products have applied marks and have been applied for patents as part of this work.