Characterization On Spinning Process And Structure And Property Of Composite Yarn By Multi-Axial Spinning System

With the rapid development of complex spinning technology in various spinning ways, rigid fiber complex spinning is still less studied by researchers. So, the paper designed a guide way to build up a set of external yarn guide and to turn out to spin complex yarn without damage to the strength of the rigid fiber, after we studied two different means of yarn guide including the yarn guide of core-spinning style and leaps style, these two ways had greater damage on the strength of the rigid fiber.Moreover, the paper studied the effects of the nylon filament space, the space between the external yarn guide and convergence point, the speed ratio of front roller and the external yarn guide, and spindle speed on the yarn properties, and then optimize the spinning process parameters by analysis of variance; then, the mechanical model of the spinning and verification were made. Finally, by analyzing the tensile fracture of composite yarn, a complex yarn tensile fracture model was established and verified.Through a series of comparative experiments, it can be concluded as following:1. the change of the single factors on the nylon filament space, the space between the external yarn guide and convergence point, the speed ratio of front roller and the external yarn guide, and spindle speed have impacts on the breaking strength, elongation, diameter, twist angle and high degree of twist; especially, spindle speed has greater impact on the breaking strength of the carbon filament complex yam, the difference reached43.4%.2. By orthogonal test and analysis of variance, the optimal process parameters are set to be configured as:nylon filament space as10mm, the space between the external yarn guide and convergence point as0.8m, the speed ratio of front roller and the external yarn guide as1.15:1, and setting spindle speed as35. The strength and elongation of the carbon filament complex spinning yarn increased62.5%and132%respectively compared with carbon filament. 3. Good wrap performance of composite yarn. Filament alternating is spiral to be wrapped on the surface of the rigid filament, coating rate reaching as high as100%, and twist largely affects on the strength of composite yarn, which increases initially and then decrease with the twist first, increasing4. The angle between the two filaments is symmetrical on the rigid filament, the spinning mechanical model and the verification results and the actual distribution of the same force and moment being validated.5. being validated on the tensile fracture model, yarn’s linear elastic is modeled and described by Hooke’s spring model under low twist, and the correlation coefficient is up to0.99; the nonlinear viscoelastic characteristics can be described by the three components of the model under high twist, and the correlation coefficient is up to0.99984The study of rigid fiber wrapped spinning technology can effectively reduce the damage to the performance of these fibers in the applied process and quality, and provide technical support for rigid fibers in security and reliable applications, rigid-flexible complex spinning technology can provide theoretical guidance, and has important scientific significance and practical value.