Numerical Simulation of the Non-Isothermal Co-Extrusion Fiber Spinning with Flow-Induced Crystallization

Abstract

In this work, the numerical simulation of the non-isothermal steady co-extrusion fiber spinning with flowinduced crystallization is explored. The model is based on the formulation originally proposed by China et al. in which Newtonian and Phan-Thien-Tanner (PTT) fluids are considered the core and the skin layer, respectively. The polymeric flow rate fraction, Deborah dimensionless number and the PTTs parameters on the temperature, the velocity and the crystallization profiles are analyzed. The numerical results show: the temperature profile is sensitive to the polymeric layer flow rate and the deformation parameters (shear thinning and extensional), the tensile stress induced crystallization parameter has a strong influence at the onset of the process, increasing drastically temperature and crystallinity.

Verification of the Influence of Processing History through Comparing High-Speed Melt Spinning Behavior of Virgin and Recycled Polypropylene

“…Generally, in the melt spinning process at high take-up velocities, after gradual thinning of the spin-line, an abrupt and sharp decrease in diameter occurs at a certain point. This behavior is called 'neck-like deformation' [20][21][22][23][24][25][26][27]. Neck-like deformation is known to play an important role in the stabilization of the melt spinning process and the development of the fiber structure [25,26].…”