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Dynamics of viscoelastic fluids, melt fracture, and the rheology of fiber spinning

✍ Scribed by James Lindsay White

Publisher
John Wiley and Sons
Year
1964
Tongue
English
Weight
1023 KB
Volume
8
Category
Article
ISSN
0021-8995

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✦ Synopsis

The hydrodynamic theory for the flow of nonlinear viscoe!astic fluids is developed. Two new dimensionless groups must be introduced into the complete second-order COT- rection of viscoelastic flow. These groups are called the Weissenberg and viscoelastic ratio numbers.

It is argued that the Weissenberg number determines the onset of melt fracture.

Applications to industrially important problems are discussed.

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In the nylon 6 melt spinning process at speeds of 900 and 1200 m/min the quenching is done in a stepwise manner. The effect on physical data of the drawn yarn is investigated and correlation between quench height, water takeup, and boiloff shrinkage discussed. Length changes across the takeup machin