Structural characteristics: Polypropylene hollow-body yarns are generally composed of continuous polypropylene filaments with a relatively regular molecular chain structure within the fibres. At the microscopic level, the molecular chains interact with each other through certain chemical bonds and van der Waals forces, and this structure makes polypropylene hollow yarns have better stability. From a macroscopic point of view, the surface of polypropylene hollow yarn is relatively smooth and the fibres are uniform in thickness, which helps it to perform better in subsequent processing and application, for example, it is not prone to snagging in the weaving process.