A dry-jet wet spinning spinneret and its manufacturing method

Abstract

The invention discloses a dry-jet wet spinning spinneret and a manufacturing method thereof. The air inlet is distributed symmetrically with respect to the symmetric axis of the spinneret, and the air inlet is connected to the gas supply device; the lower part of the fairing is immersed in the coagulation bath to seal, and the fairing is located above and near the liquid surface to set multiple air outlets. The presence of the submerged fairing ensures that the spinneret and the spinning liquid flow are under stable atmosphere conditions, and the obliquely upward air outlet of the fairing lower cover can prevent liquid level fluctuations and at the same time act as an air seal near the liquid surface. The inclination angle of the shell of the rectifying upper cover is the same as that of the tapered spinneret shell, and the air flow diffuses through the parallel inclined planes to achieve the effect of uniform and gentle circulation.

Description

technical field [0001] The invention belongs to the field of chemical fiber manufacturing engineering, and in particular relates to a dry-jet wet spinning spinneret and a manufacturing method thereof. Background technique [0002] The dry-jet wet spinning process is to raise the spinneret above the level of the coagulation bath, and the height can generally reach 10-40mm. After the spinning stock solution is sprayed from the spinneret, it must first pass through a high air layer to eliminate The outlet expansion effect of the polymer solution and the high positive draft of the liquid flow allow it to obtain a smaller diameter before entering the coagulation bath, which is conducive to the further double diffusion process in the subsequent coagulation bath. [0003] It is precisely because of this high-speed, high-power drawing process and small liquid flow diameter that the change of environmental factors in the air layer can easily cause liquid flow instability and even bro...

AI Technical Summary

Problems solved by technology

The manufacturing process of the one-piece spinneret is complicated. Due to its large number and area of ​​openings, the ratio of diameter to depth must be small enough to resist the deformation caused by high pressure, so the cost is high

The dry-jet wet spinning process has extremely high requirements on the quality of the spinning stock solution. Once the slow flow or clogging of individual spinneret holes occurs, it may affect the normal drafting of the surrounding tow. Therefore, for the integrated large-tow spinneret Said that even if a very few spinneret holes are unhealthy, their cleaning and maintenance need to be fully processed, which increases the maintenance cycle and cost, and reduces production efficiency

Images