ultrafine fiber

基本解释

This kind of PP fiber can be prepared by blend spinning of pure PP chips and ultrafine zeolite.
将超细分子筛与纯PP切片共混后熔融纺丝，经过后拉伸及松弛热定型就可制得含分子筛的PP纤维。
Recent years, electrospinning is not only limited to produce polymeric ultrafine fibers, but also combined with other techniques to prepare ultrafine inorganic fiber materials.
近几年，随着电纺技术的日趋成熟，电纺已不仅仅局限于制备传统的聚合物超细纤维，而可以与其他技术结合，应用于功能超细纤维材料的制备。

That means separating the unwanted coarse outer hair of the goats from the valuable ultrafine cashmere underfleece, which measures just 12 to 18 microns in width (one sheep wool fiber is more like 25 microns wide).
FORBES: Magazine Article