The rapid development of polypropylene BCF yarns is inseparable from the high demand of the market, especially in the field of carpets. The economics and high output of polypropylene, as well as the diversity of functions, are the key factors to promote the growth of the polypropylene BCF yarn market.

Polypropylene BCF yarn, commonly known as polypropylene expanded yarn, polypropylene carpet yarn, BCF is the abbreviation of expanded continuous filament, and does not refer to expanded continuous filament produced by one-step process. Polypropylene BCF yarns can be made in several different processes.

Lin Jia gives you a brief introduction to the three processes for making polypropylene BCF yarns:

Preferred species: one-step method: continuous spinning, stretching, deformation, winding process

The second method: two-step method: spinning and drawing combined → twisting or spinning winding → twisting and drawing deformation

The third method: three-step method: spinning and doffing → wire drawing → deformation

The process of continuous production of polypropylene BCF yarn by one-step method requires: simultaneously using three screws of the same specification to extrude melts of different colors corresponding to the three requirements, and then pass through the distribution pipe to reach the spinneret, so that each filament is made of three different The color of the silk is assembled, and the polypropylene BCF yarn is made by continuous stretching deformation.

The two-step or three-step process is basically similar in that a winding bobbin is set to one color, and then the three color bobbins are combined and stretched to form a polypropylene BCF yarn.

Although there are three kinds of processes in foreign countries, the two-step process is used more.