The History of Microfiber Production of ultra-fine fibers (finer than 0.7 denier) dates back to the late 1950s, using melt-blown spinning and flash spinning techniques. However, only fine staples of random length could be manufactured and very few applications could be found.[3] Experiments to produce ultra-fine fibers of a continuous filament type were made subsequently, the most promising of which were run in Japan
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