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SCO is an independent consulting office specializing in the areas of polymer processing and fiber formation by providing consulting services and software development.
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Dry Spinning Simulation |
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[Computer Simulation of Dry Spinning, Japan Plastics, Vol.57, No.2, P.87(2006)]
Dry spinning has long been used for producing acetate, acrylic, spandex filaments etc., along with melt spinning and wet spinning, When filaments are dry-spun, viscous solution from polymer and solvent is extruded through fine holes into hot gas to evaporate the solvent, and solidified into filaments. To analyze the dry spinning process, it is necessary to consider heat balance, mass balance and momentum balance at the same time. It can be said that dry spinning is a sophisticated and complicated phenomenon to simulate. Dry spinning theory by Ohzawa et al. [8], [9], [10], [11] was epoch-making one, and ensuing researches seem to be done based on this theory. Theory and simulation in this article are based on the theory of Ohzawa, but the present writer makes some refinements in preciseness. Points of the refinements are the introduction of solvent content distribution and elongational viscosity distribution inside a filament, and the introduction of heat balance and mass balance of drying gas as most dry spinning processes adopt parallel gas flow to the yarn path in spinning tubes. This article explains the refined theory, its simulation program, calculation example etc. in detail. [8] Ohzawa, Y., Nagano, Y. and Matsumoto, T., J. Appl. Polym. Sci., 13, 257 ('69) [9] Ohzawa, Y. and Nagano, Y., J. Appl. Polym. Sci., 14, 1879 ('70) [10] Ohzawa, Y., Macromolecule (Japan), 19 (222), 790 ('70) [11] Ono H. and Ohzawa, Y., 'Sen-i no Keisei to Kouzo no Hatsugen (written in Japanese; 'Fiber Formation and Structure Generation of Fibers') (III), P.157, Kagakudojin ('71) |