Dry Spinning (of Fibers)

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Overview

Dry spinning is used to form polymeric fibers from solution. The polymer is dissolved in a volatile solvent and the solution is pumped through a spinneret (die) with numerous holes (one to thousands). As the fibers exit the spinneret, air is used to evaporate the solvent so that the fibers solidify and can be collected on a take-up wheel. Stretching of the fibers provides for orientation of the polymer chains along the fiber axis. Cellulose acetate (acetone solvent) is an example of a polymer which is dry spun commercially in large volumes. Due to safety and environmental concerns associated with solvent handling this technique is used only for polymers which cannot be melt spun.

Process Schematic


dry spinner

References

An excellent general reference on fiber spinning is:
A. Ziabicki, Fundamentals of Fiber Formation, Wiley, New York (1976). ISBN 0471982202.
A more detailed study of dry spinning is :
Y. Ohzawa, Y. Nagano, and T. Matsuo, J. Appl. Polym. Sci., 13, pp. 257-283 (1969).



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