Numerical Simulation of Fiber Spinning Process with Structure Evolution of Polymer Chains

摘要

Numerical simulation of the high-speed fiber spinning process was carried out using Polyflow software, based on the models proposed by Doufas et al. Calculation predicts not only the variation of parameters along the spinline, but also the radially distribution of flow field variables, such as temperature, crystallinity and molecular structure. Considering combined effects on the process such as flow-induced crystallization, viscoelasticity, filament cooling, air drag, inertia, surface tension and gravity, the simulated material flow behaviors are consistent with that observed for semi-crystalline polymer under various spinning conditions. The structure change of polymer coils in the necking region described by the evolution of conformation tensor is also investigated. Moreover, three-dimensional (3D) simulation approach was also used to predict the fiber shape given the spinneret geometry, combined with the die design capability. It is helpful to design die geometry for generating fibers with complex cross-sections.