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Polypropylene BCF yarn is treated by putting the yarn in steam, hot air or boiling water. At this time, the fiber with high shrinkage rate will shrink more and it is located in the center of the yarn. The mixed low shrinkage fiber will be affected by the small shrinkage. Extrusion forms a loop on the surface of the yarn to obtain a fluffy, plump and elastic BCF yarn.

Performance indicators of polypropylene BCF yarn: Grey fabrics woven from polypropylene BCF yarn are generally dyed and napped (single-sided or double-sided), etc. The fabric requires soft, fluffy, elastic and uniform dyeing. Therefore, the bulkiness of bulked yarn, the specifications of raw materials, and the uniformity of mixing are the main performance indicators.

Polypropylene BCF yarn features: It has both the high strength of continuous long fiber and the bulkiness of short fiber, and it has the characteristics of high temperature resistance, friction resistance and corrosion resistance.