منابع مشابه
Optimal Control of Melt Spinning Processes
An optimal control problem for a mathematical model of a melt spinning process is considered. Newtonian and non–Newtonian models are used to describe the rheology of the polymeric material, the fiber is made of. The extrusion velocity of the polymer at the spinneret as well as the velocity and temperature of the quench air serve as control variables. A constrained optimization problem is derive...
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Isothermal melt crystallization kinetics of PVDF was investigated by differential scanning calorimetry. Thin PVDF film has been fabricated by the solvent casting technique using dimethylformamide (DMF). Then, the samples were melted and subsequently crystallized in the range of the crystallization temperature (Tc) between 138 and 145 °C. The crystallization kinetics was derived from Avrami equa...
متن کاملContinuous Melt Suspension Crystallization of Phosphoric Acid
A continuous melt suspension crystallization process has been presented for the purification of the phosphoric acid in this study, which is performed in the cascade of a mixed suspension mixed product removal (MSMPR) crystallizer and a gravity wash column for the subsequent solid-liquid separation. Dynamic behavior in the crystallizer and role of reflux ratio on the purification efficiency of c...
متن کاملHeat Transfer during Melt Spinning of Al-7%si Alloy on a Cu-be Wheel
Transient heat transfer models of the single-wheel meltspinning process are developed and applied to quantify the effect of process variables including interface depressions on solidification, temperature evolution, thickness variations, and surface depressions in the cast product. Firstly, a transient one-dimensional heat-transfer model of the melt-spinning process called STRIP1D was developed...
متن کاملIn-Situ X-Ray Characterization of Fiber Structure During Melt Spinning
The properties of a polymer are strongly influenced by its morphology. In the case of fibers from semicrystalline polymers this consists of the degree of crystallinity, the spacing and alignment of the crystalline regions, and molecular orientation of the polymer chains in the amorphous regions. Information on crystallinity and orientation can be obtained from X-ray analysis. In-situ X-ray char...
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ژورنال
عنوان ژورنال: Kobunshi
سال: 1970
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.19.589