Research And Application On TRI-Component Composite Fibers

The composite fiber is using different components, mixing ratio and viscosity makes two or more polymer melt or solution input the same spinning components respectively, and meet at proper positions in the components, so as to be a fiber in the one spinneret hole. So there are two or more than two kinds of polymers in an infinitely long fiber.At present, in our country the development of the multi-component fiber products imitate the external new products mainly. As the lack of the guidance of the optimization and control theory of the spinning process conditions, and only study the control technology of the fiber forming process through practical experience and trial, that increase the development cost and cycle. Therefore, this paper researches the forming mechanism of the tri-component composite fiber, spins the tri-component composite fiber and applies the tri-component composite fiber in the field of anti-counterfeiting.Firstly, this paper introduces the research status an home and abroad and the application of the multi-component composite fiber, and deeply analyzes the effect of extrusion swelling on fiber forming. According to the polymer rheology control equation and the forming boundary conditions of tri-component composite fiber, this paper derives the flow equation and extrusion swelling equation of the tri-component composite melt in the circular microporous.Secondly, on the basis of the theoretical study and Polyflow, this paper simulates the extrusion molding mechanism of PA6/PET and PA6/PET/PP composite spinning melt to study the effect of the viscosity, the slenderness ratio, the convergence angle and the flow on the extrusion swelling. To learn that:the smaller the difference of the melt viscosity is, the smaller the extrusion swelling ratio is and the better the fiber’s performance is, appropriately increasing the slenderness ratio can reduce the extrusion swelling ratio, appropriately decreasing the convergence angle can reduce the extrusion swelling ratio, and appropriately increasing the PA6’s flow and decreasing the PET’s flow can reduce the velocity’s difference, in order to improve the fiber’s performance.Then, this paper simulates the pressure drop and velocity distribution of the tri-component composite spinning components by Polyflow, and optimization designs the tri-component composite spinning components. Later, simulate the stretch forming process of the tri-component composite fiber by Polyflow and study the effect of the tensile velocity and the flow on the stretch forming process. To learn that:in the influence of tensile velocity, the low viscous melt play a leading role on the extrusion swelling; with the increase of tensile velocity, the extrusion swelling ratio of the tri-component composite fiber decreases.Finally, this paper spins the tri-component composite fiber and the tri-component composite anti-counterfeiting fiber through the tri-component composite spinning test facilities and tri-component composite spinning components, tests the cross section shape and mechanical properties of two kinds of fibers, and calculates the anti-counterfeiting intensity of the tri-component composite anti-counterfeiting fiber. To learn that:the interface between the various components of the tri-component composite anti-counterfeiting fiber are relatively clear, the mechanical properties of two kinds of fibers are favorable, the mechanical properties and the elongation of the tri-component composite fiber without stretching process is poor and the anti-counterfeiting security level of the tri-component composite anti-counterfeiting fiber is up to grade B.