Simulation and Experimental Verification of Crystallization and Birefringence in Melt Spinning of PET

Polyester fiber spinning analyzed with multimode Phan Thien-Tanner model

“…f can depend on the first normal stress difference [28], on the first invariant of the tension tensor [10], on the orientation of the amorphous phase [14] or the deformation of the fiber and the orientation [29]. Here, for our calculations, we define f as function of the first normal stress difference:…”