Variables in dry spinning

There are a number of variables that control fiber quality in dry spinning (Ziabicki, 1976 Van Kerevelen and Nijenhuis, 2009).These include  

Polymer solution concentration and rheology Die swell and skin friction in filament formation Rlament solidification. 

As in all fiber spinning processes, the key engineering variables are temperature, T, stress, a, and, in the case of solution spinning, mass transfer, j3. Key to solution properties is the polymer molecular weight, M, which is a strong factor in both solution viscosity and solidification rate, llie following sections review these variables. 

The forces acting on the spin line are given in the general force balance (Ziabicki, 1976)  

Solidification of the dry spinning filament is due to the evaporation of the solvent component from the spin line. There are three mechanisms in the solvent removal process  

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