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Polypropylene BCF yarn, there are many other names: polypropylene bulk yarn, polypropylene carpet yarn, today let us understand several processes of polypropylene BCF yarn.
Three technological processes for making polypropylene BCF yarn:
The first type: one-step method: continuous spinning, stretching, deformation, winding process
The second method: two-step method: spinning and drawing combined → doubling yarn deformation or spinning winding → doubling yarn stretching deformation
The third type: three-step method: spinning doffing→combination drawing→deformation
The process requirements for the one-step continuous production of polypropylene BCF yarn: using three screws of the same specification at the same time can extrude the melt of different colors corresponding to the three requirements, and then pass through the distribution pipe to the spinneret, so that each filament consists of three different types. The colored silk is assembled and finally made into polypropylene BCF silk through continuous stretching and deformation.
The production process of the two-step or three-step method is basically similar, that is, one winding bobbin is set with one color, and then the three-color bobbins are combined and stretched to form a polypropylene BCF yarn.
These three processes have been applied abroad, but the two-step process is the most widely used.