This book provides critical insights into the properties and applications of melt-blown fibers in the polymer composite field. The book offers a comprehensive overview of the melt-blowing process and explores the intricate structure-property-parameter relationship of melt-blown fibers. In addition, the book presents a straightforward method for manufacturing multiscale Polypropylene single-polymer composites and carbon-nanotube-doped Polypropylene melt-blown fibers.