| Polyester/nylon composite fiber is a kind of ultra-fine fibers. Fabric is made of by it hassoft, waterproof and breathable and strong cleaning property. Grade fabric such as imitationpeaches made of by it wins the market’s fans, because the fabric breathable, moisture, wateringnon-deformation characteristics. Trilobal fiber having excellent optical characteristics, whilehaving a large coefficient of friction, feeling rough, thick, durable, more suitable for outerwearfabrics. Trilobal filaments are suitable for knitting outer clothing. Such fabrics will not beenhooking wire and jumping wire, even if it will not be a hole. Pile fabric produced by trilobal fiber,it suede can keep it plump, erect, with good mechanical fluffy. However, the development ofdifferentiated fiber is developed late, and polyester/nylon composite fiber is still in thedevelopment stage. The development of special-shaped polyester/nylon composite fiber has yet topick up the pace. Currently available polyester/nylon composite fiber in the market is main islandand Sheath-core type, etc. The main task of this project is preparation and development ofpolyester/nylon trilobal component and composite fiber components, making the new compositefiber of anisotropic characteristics, which not only has the advantage of Polyester/nylon compositefiber, but also has the advantage of trilobal fiber.Firstly, the species and the development of differential fiber, as well as polyester and nyloncomposite fiber, trilobal fiber characteristics are introduced. The structural designs of the spinningcomponents, trilobal spinneret are analyzed. The ways to install and seal component are discussed.The pressure drop for component,, shear rate of spinneret’s microporous, flow of signal hole, ratioof stretch and other parameters of the design are calculated. A reasonable spin pack and spinneretsare designed, which preparethe preparation task-oriented experiment.Secondly, the numerical simulation of an stretch forming of single-component trilobalfibers has been done using Polyflow software. The effect of component material for the stretchforming of trilobal fibers has been analyzed, the analysis is mainly for the size of the meltextrusion speed, velocity gradient, forming distance. After that, the extrusions of three-component(PA6/PET/PP) trilobal fibers melt are simulated mainly for different flow ratio among the three components by fluent software. In the melt extrusion process, the velocity distribution and thevolume distribution are analyzed. According to the analysis of simulation results, the appropriateflow proportional of experiments are selected, which avoid blindness experiments.In the end, we determined the parameters of spinning and completed the preparationexperiment. Based on the specialty of the polyester/nylon composite trilobal fiber, which wasmade in this experiment, we selected the spinning parameters, such as the melt flow, temperatureof the PCB, temperature of box, method, speed and temperature of blowing, the speed of spinningand so on. We took the Microscopic observation experiment and tensile experiment for the surfaceand section of the as-formed fiber. At the same time, we analyzed the surface quality and strengthproperties of the as-formed fiber. Then we evaluated this experiment and improved it.In summary, through the above research, we developed the applicable trilobal spinneret andspinning component. We made a numerical simulation of the stretch forming of the trilobal fiberby using ployflow, and simulated the extruding process of the trilobal fiber. We acquainted themolding mechanism of single component and three-component trilobal fiber, and then wedesigned the rational parameters of spinning. We developed the fine strength properties trilobalfiber, and provided valuable experience for the polyester/nylon composite trilobal fiber. |
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