What issues should be paid attention to when producing polypropylene FDY yarn?

Polypropylene FDY yarn production process: mixing - feeding - screw extruder - melt filter - spinning box - side blowing - spinning tunnel - oiling - yarn guide - first drafting heat roller - guide wire - second draft heat roller - yarn guide - third draft heat roller - yarn guide - fourth draft heat roller - yarn guide - fifth draft heat roller - network - winder - cheese wire

The filament spinning temperature of polypropylene FDY directly affects the rheological properties of polypropylene, the degree of degradation of polypropylene and the degree of pre-orientation of nascent fibers. Therefore, the spinning temperature is the main process parameter in melt forming. If the spinning temperature is too high, the melt viscosity is too large, and the yarn and the filament are easily generated during spinning; at the same time, because the melt viscosity is too low, the fluidity is large, and the self-weight is formed to be larger than that caused by the stretching of the nozzle. Silk phenomenon. The spinning temperature is too low, the melt viscosity is too large, and the twisting yarn is difficult and uneven, which causes the melt fracture to be wound when the spinneret is stretched, and the full break and hard wire may occur in severe cases.

Ningbo Volkswagen Chemical Fiber Industry Co., Ltd. is now a national medium-sized enterprise, a large industrial enterprise in Zhejiang Province, with an annual output of 68-1800D PP yarns, PP POY yarns, polypropylene plain yarns, PP FDY yarns 15,000 tons, 1.5D-13D The specifications of polyester staple fiber 25,000 tons, "Volkswagen" brand has been rated as recommended products in Zhejiang Province for six consecutive years.