This document summarizes the process of dry spinning cellulose acetate fibers. It begins with defining dry spinning as using air to evaporate a volatile solvent after extruding a polymer solution through a spinneret. It then discusses the raw materials, including cellulose, acetic acid, and acetic anhydride. The process involves partially hydrolyzing cellulose with these compounds to produce cellulose acetate, dissolving it and extruding the solution through a spinneret where air evaporates the solvent to form solid fibers. The fibers can then be stretched and oriented to increase strength before being spun into fiber. The fibers have various applications including fabrics, cigarette filters, and water purification membranes.