Effect of Side Blowing Temperature on High Speed ​​Spinning of Nylon 6

Through production practice, product testing, and combined with product performance requirements, set a reasonable side blowing temperature, to improve the production rate of nylon 6 spinning, and reduce the waste rate, reduce broken ends, wool, hard wire Opening up will play a key role.

In today's increasingly competitive nylon 6 market, conventional two-step spinning technology with low production efficiency, high cost and poor performance has been phased out, replaced by one-step spinning technology with low cost, high efficiency and high performance. Compared with the two-step method, the nylon 6 one-step method is more advanced, and the spinning speed is also faster and faster, so it is also called high-speed spinning.

Because the spinning speed of nylon 6 high-speed spinning is relatively fast, the requirements for setting the production process parameters are more stringent. The side blowing temperature is the freezing point of the stable filament, which makes the spinning melt fine-flow nozzle stretch deformation, macromolecular orientation, One of the key factors for maintaining crystallinity.

When the side blowing temperature is too high, the freezing point of the nylon 6 fiber moves downward, the fiber crystal transitions rapidly, the stretchability of the fiber deteriorates, the spinning breaks more, and the waste silk rate is high. Once this phenomenon occurs, it is necessary to adjust the process in time, and minimize the consumption of cold, to meet the requirements of side blowing, or to add a plate heat exchanger to the outlet pipe of the spray pump, and to spray water with chilled water. Spray after cooling.

However, if the side blowing temperature is too low, the spinning melt flow of nylon 6 is accelerated during the cooling forming process, the fiber is prone to cracks and cracks, and a hard wire is formed, and the filaments are broken and stretched. Head, tensile performance is reduced. At this time, the heating efficiency of the heater can be appropriately increased.

Therefore, through production practice, product testing, and combined with product performance requirements, set a reasonable side blowing temperature, to improve the production rate of nylon 6 spinning, and reduce the waste rate, reduce broken ends, wool, hard The formation of silk will play a key role.