Abstract: Evenness of PET industrial filament tow can be affected by many factors. When produced by regular spinning machine, the cross flow air from vertical filter can not quench the filament tow uniformly,thus the evenness of the filament tow is affected negatively. Based on practice, this article introduced a way to improve this situation. By adding a rectifier box in front of vertical filter, the distribution and speed of cross-flow cooling air will be more uniform, thus the evenness of PET industrial filament tow can be improved.

Key words: PET industrial fiber; cross-flow quench; thermal energy balance