Polypropylene bulked continuous filament (PP BCF) is a functional bulked continuous polypropylene filament made from polypropylene (PP), and a core category of functional polypropylene yarns. Based on regular polypropylene continuous filaments, it undergoes a thermal drawing and thermal shrinkage bulking process. Permanent crimps are formed by the uneven thermal shrinkage of monofilaments, creating a fluffy and three-dimensional fiber structure that greatly enhances the yarn's volume, elasticity and wearing comfort.

In contrast to regular polypropylene continuous filaments with a straight and dense structure, polypropylene bulked continuous filament forms a large number of air gaps inside. Relying on air insulation, it achieves excellent thermal insulation performance while significantly improving softness and resilience. It also fully retains the inherent properties of polypropylene such as light weight, high strength, chemical resistance and wear resistance, delivering a user experience close to that of natural fibers and effectively making up for the shortcomings of regular polypropylene including poor elasticity and low thermal insulation.

Boasting comprehensive advantages of light weight and fluffiness (with a density of 0.91g/cm³, the lightest among commonly used chemical fibers), excellent thermal insulation, good resilience and affordable production costs, polypropylene bulked continuous filament has a wide range of application scenarios. It is used in the civil textile field for knitted underwear, thermal fabrics and other products; in the decorative textile field for pile carpet face yarns, back yarns and more; and also in the industrial textile field for filter materials, insulation felts, geotextiles and other industrial textiles.