Numerical simulation research of extrusion-forming process of cross fibers based on Polyflow

The numerical simulation of the extrusion-forming process of cross fibers was performed based on Polyflow software.The simulated results revealed that the change of velocity distribution of the melt after extrusion from the spinneret and the extrusion swell of the polymer melt occurred simultaneously.The surface tension dominated the fiber section variation and initially determined the range of the deformation distance of the cross fiber.So the effect of surface tension on the forming process of the fiber should be taken into consideration when designing the spinneret orifice.To obtain the accurate cross section of a profile fiber,the numerical simulation of the backward extrusion process of polymer melt should be accomplished before making design of spinneret orifice.These findings provide a theoretical reference for the development of profile fibers.