What are the precautions when producing PP FDY yarn?

PP FDY yarn production process: mixing - feeding - screw extruder - melt filter - spinning box - side blowing - spinning tunnel - oiling - yarn guide - the 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 spinning temperature 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. was founded in 1984, long-term production and operation: polypropylene filament, polypropylene filament, PP FDY yarn, polyester staple fiber, polypropylene full stretch yarn, polypropylene POY silk.