Abstract
This paper analyzes the characteristic features of necking during drawing and ultrahigh-speed spinning of polyethylene terephthalate (PET) yarns. It is established that despite the formal analogy, there are significant differences between necking in the indicated processes, due to the non-isothermal nature of ultrahigh-speed spinning. Based on literature data and my own ideas, I propose my own version of the necking mechanism during ultrahigh-speed spinning, which adds to information known about this process. When a neck appears during the ultrahigh-speed spinning process, the determining factors may be those related to the abrupt change in viscoelastic properties under the influence of high strain rates and the balance of acting forces.
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