Abstract
The single fibers from a multiple spinneret having holes of equal diameter but of different lengths may have considerably different diameters. suggesting the use of Poiseuille's formula for flow through capillary tubes to describe or predict the effect.
A simple spinneret having four holes of equal diameter and known differing cylin drical hole lengths (10 times the sizes used for fiber sprinning) was built to test polymer solutions. The long hules extruded less material than the short holes for a homogeneous polymer solution or liquid The amount extruded from each hole was consistent with the amount calculated by Poiseuille's formula. However, when gelatinous masses were present in the polymer solution. Poiseuille's formula was no longer applicable, an increase in the material coming from the longer holes always being noted. This increase m percent material could be used as a test for the degree of solution inhomogeneity.
When an inhomogeneous polymer solution was spun into fibers, the occurrence of thick-and-thin filaments was noticeable when different portions of the same fiber were examined in the vibroscope.
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