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Title Controlling micro- and nanofibrillar morphology of polymer blends in low-speed melt spinning process: Part I. Profiles of PLA/PVA-filament parameters along the spinline
Date 15.12.2016
Number 50464
Abstract The profiles of PLA/PVA filament parameters (e.g., temperature, velocity, tensile stress, and apparent elongational viscosity) along the spinline in the low-speed melt spinning process under various spinning conditions were investigated. Owing to the combination of the filament velocity and filament temperature measurements using laser doppler velocimetry (LDV) and infrared thermography, respectively, the fiber formation zone was determined. The length of the fiber formation zone obtained from filament velocity profiles inline image is always shorter than that obtained from the filament temperature profiles inline image ( inline image. Obviously, this unexpected phenomenon occurs for low spinning speeds due to the axial heat conduction effect of the filament along the spinline and the nonuniform radial temperature distribution through the cross-sectional thick filament. Another remarkable finding is related to the Nusselt number which has been found as nearly constant along the spinline in the low-speed melt spinning process. Thus, mathematical simulations of the filament temperature profiles will be simplified drastically. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44258.
Publisher Journal of Applied Polymer Science
Identifier
Citation Journal of Applied Polymer Science 133 (2016) Art.No. 44258
DOI https://doi.org/10.1002/app.44258
Authors Tran, N. H. A. ; Brünig, H. ; Heinrich, G.
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