| Summary: | 碩士 === 淡江大學 === 化學工程研究所 === 83 === This research studies the elongational behavior of the polymer
melt extruded from the single screw extruder.The elongational
viscosity of the polymer melt is measured with the fiber
spinning. The strain rate can be obtained by photographic
techniques, and the elongational stresses can be obtained
by the force balance over the filament . We can obtain the
elongational viscosity at low strain rates,ranging from 0.1 to
3 1/sec. The measuring range of the strain rates was
affected by the die swell and the polymer drawability.The
much more die swell and the less drawability got the lower
measuring range of strain rates. The draw resonance occurs at
higher draw ratio,if the temperature of the meltis increased.
The White-Metzner model gives reasonable fitting to the
measured elongational Viscosities.
|
|---|
