Abstract
Three basic methods of preparation of synthetic fibers are used commercially: (1) wet spinning, (2) dry spinning, and (3) melt spinning. In each process a viscous fluid is extruded through a multiholed die or spinneret, forming a fine-diameter fiber. Polypropylene fibers are prepared via the melt spinning technique, which essentially is comprised of two manufacturing stages: (1) extrusion of a fiber and (2) the subsequent thermal and mechanical stretching of the fiber. A diagram of a typical equipment line arrangement is shown in Figure 3. The various process equipment used in the preparation of polypropylene fibers is described below.
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