Hollow polyphenylene sulfite short fiber multistage ring air-cooling process

Abstract

The invention provides a hollow polyphenylene sulfite short fiber multistage ring air-cooling process. The process comprises the following steps that: a melt extrudes out of a spinning hole, multistage ring air cooling is performed through a plurality of air ducts, wherein five air ducts have five different wind speeds, namely a first wind speed of 0 to 4 m / min, a second wind speed of 0 to 3.5 m / min, a third wind speed of 0 to 3 m / min, a fourth wind speed of 0 to 2.8 m / min, and a fifth wind speed of 0 to 2.5 m / min, after multistage intake air is blown into a ring air-cooling device, and uniform air flow after passing through the ring air-cooling device is blown to tows extruded from a spinning plate, so that the cooling process is completed. By using the 5-level blowing process, the air speed can be gradually increased, the cooling effect can be reflected gradually, and the stress of molecules can be released gradually, so that a curling effect is avoided, and a hollow effect of polyphenylene sulfite short fibers is improved. Compared with the common ring air-cooling process with one-level speed, the multistage ring air-cooling process has 5 speed levels, and a gradual cooling effect is achieved.

Description

technical field [0001] The invention relates to a ring blowing process, in particular to a multistage ring blowing cooling process for hollow polyphenylene sulfide short fibers, which belongs to the field of chemical fiber manufacturing. Background technique [0002] The main purpose of polyphenylene sulfide staple fiber is to make filter cloth, because it is a solid fiber, so the unit weight is high. On the one hand, the customer uses the high cost of use, which increases the cost of the enterprise; on the other hand, the filter cloth made is heavy and difficult to construct. In order to reduce the unit weight, the hollowing of polyphenylene sulfide has attracted more and more people's attention, and has become an important issue in the production of polyphenylene sulfide staple fibers at this stage. [0003] During the production of PPS staple fiber, the high-temperature viscous melt is extruded from the spinneret hole, cooled by blowing at a certain temperature and humid...

AI Technical Summary

Problems solved by technology

When the wind speed is too low, the cooling condition of the outer layer of the tow wind is very different, the plastic zone is extended, and the freezing point moves down, resulting in an increase in the unevenness of the original silk section

When the wind speed is too high, the airflow from the ring blower not only penetrates the tow to reach the center of the tow, but also has residual kinetic energy, causing turbulent mixing in the center of the tow. A strong eddy current is formed at the plate, causing the yarn to shake and affect the quality of the raw yarn

[0005] In the current PPS staple fiber production process, the ring blowing process steps used in the ring blowing process are too simple, and the ring blowing speed cannot be adjusted. Using a single wind speed during ring blowing will make the molecular fluidity of PPS poor. , When the wind speed is too high when spinning hollow fibers, it will cause molecular stress changes, resulting in the deformation of the filaments, forming a curl effect, so it is difficult to achieve the hollowing effect of polyphenylene sulfide