| Summary: | 碩士 === 國立臺灣科技大學 === 高分子系 === 97 === This study mixed oxidized fibers with Technora® fibers to enhance the mechanical properties of these fireproof materials and improve their industry application. In the experiment, with the aim to spin 15 and 17Nm composite yarns, two pairs of roller drafts were used to draft oxidized fibers into short fibers. Meanwhile, Technora® was fed to the fiber splitting unit by static electricity, which was above the inlet of middle roller, guided by upper and lower aprons, and spun to high-performance composite yarns at the spinning triangular space at the outlet of front roller. Five different methods were used in the experiment for processing Technora® fiber bundles, the fiber bonding between the two kinds of fibers was observed, and the influences of various causes on the structure of composite yarns were discussed. The CV%, yarn strength, abrasion resistance and L.O.I tests were conducted for evaluating the performances of composite yarns. The experimental results showed that, in the general, CV% increased with the increase of spinning counts; yarn strength increased as the twist increased, but when the twist factor exceeded 3.5 to the critical level, it began to decrease. The abrasion and spray auxiliary splitting unit could effectively make Technora® composite fibers loose; however, since it caused damage to the structure of fiber bundles, CV% of yarn might increase slightly but the strength lowered. In both abrasion tests, the average residual strength of composite yarns maintained at a level of 80%. L.O.I value was dependent on the oxidized fiber surface covering, declining as the counts increased, generally above 40.
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