Comparison of Melt and Solution Spinning

Applications of PVA The largest application of PVA fibers is in paper and non-woven fabrics, where a fraction of water-soluble fiber is often used as a binder. Further applications are in twines, ropes, fabrics (tatami mats), and tarpatdins. Gel-spun , very strong, PVA fibers have become an important replacement for asbestos in cement reinforcement. 

PVA filament yarns are used almost exclusively in industrial applications where high strength is important, such as in fishing nets, ropes and cables, reinforcement of (high-pressure) hoses, and conveyor and transmission belts. PVA is not suitable as a tire cord, however, because of its inadequate fatigue behavior. 

Initially, the temperature will be flat throughout the filament (at the spinning temperature, for example 300°C) and the surrounding cooling air temperature is assumed to be constant (20°C). Gradually a temperature profile will be formed in 

Extraction of solvent from a filament Fourier number Fo=Z)t/D  

For solution spinmng, the analysis proceeds similarly, but now in terms of concentrations instead of temperatures. For example, we assume an initial solvent concentration of 0.8 (polymer concentration 20%) and solidification at c = 0.3 

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