Hollow fibre ratio, also known as hollowness or hollow rate in polyester staple fiber, refers to the percentage of the fiber’s cross-sectional area that is occupied by hollow voids. It represents the internal air space within the fiber structure.

 

Hollow lumen refers to the internal void or channel running through the cross-section of a fiber. The hollow lumen is formed and stabilized during the conjugated shrinkage process, which typically occurs in bicomponent fibers.

 

These two key factors determine the bulkiness, insulation, resilience, and weight reduction performance of bicomponent polyester staple fibers.