On the cross-section of shaped fibers in the dry spinning process: Physical explanation by the geometric potential theory

Shaped fibers with irregular cross-section has large specific surface area, high air permeability and low pressure drop, and are widely used in cigarette filters. Cellulose acetate shaped fibers are produced by the dry spinning, and fibers’ cross-section is controlled by the nozzle shape. In this paper, the mechanism for forming a shaped fiber is elucidated by the geometrical potential theory. Keywords: Irregular cross-section, Cellulose acetate fiber, Minimal surfaces, Fiber cross-section, Dry spinning process