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  • 1
    Language: English
    In: Textile Research Journal, February 2013, Vol.83(3), pp.249-255
    Description: Melt-blown die usually consists of two components: the coat-hanger feed distributor and the spinneret plate with a series of orifices. In this paper, fluid flow in double melt-blown die was simulated using the three-dimensional finite element method. The fluid flow inside the melt-blown die was analyzed, particularly the flow near the joint point of the double melt-blown die and the entrance of the orifice. Velocity distribution at the outlet of the die was also analyzed through a comparison with the fluid flow in the double melt-blown coat-hanger feed distributor. The results show that the convergence flow around the entrance of the orifice can improve the velocity distribution at the die’s outlet to a certain extent. The improved uniformity of the velocity distribution at the outlet of the double melt-blown die proves the feasibility of using side-by-side melt-blown die to fabricate wider uniform melt-blown webs.
    Keywords: Melt-Blown Die ; Spinneret Plate ; Numerical Simulation ; Melt Flow ; Engineering ; Economics
    ISSN: 0040-5175
    E-ISSN: 1746-7748
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  • 2
    Language: English
    In: Industrial & Engineering Chemistry Research, 03/27/2013, Vol.52(12), pp.4597-4605
    Description: In this study, a new annular melt-blowing die with an inner stabilizing piece was designed to obtain finer fibers and consume less energy than for the common annular die. The effects of the new annular die design on the velocity field, temperature field, and turbulence fluctuation...
    Keywords: Outlets ; Computational Fluid Dynamics ; Mathematical Models ; Computer Simulation ; Fluctuation ; Energy Consumption ; Annular ; Turbulence ; Analysis (MD) ; Chemical Analysis (Ep) ; Chemical Analysis (Ed) ; Chemical Analysis (EC);
    ISSN: 0888-5885
    E-ISSN: 1520-5045
    Source: American Chemical Society (via CrossRef)
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  • 3
    Language: English
    In: Industrial & Engineering Chemistry Research, 08/15/2012, Vol.51(32), pp.10621-10628
    Description: This article describes the study of the mechanism of fiber microformation in melt blowing (MB). Through theory analysis of the flow field of molten polymers, it is inferred that the molten polymer flows in the form of the collective motion as a unit of microlayer. There is a sliding motion between every two adjacent microlayer units, and the attenuation mechanism of the fiber formation involves different microlayers that are arranged in a longer length than that before the fiber is drawn along the axial direction in terms of their velocities. Melt blowing experiments and comparison experiments were designed and performed. After measurements of the fibers and the analysis of the experimental data, results were obtained. These results verify the inference from the principle of the shear flow and the mechanism of the fiber microformation. When the theory of the formation mechanism is used to explain the fiber tenacity, by inference the tenacity of MB fiber is lower than that of spunbond or melt spinning fiber.
    Keywords: Bildungsmechanismus ; Faserbildung ; Gleiten ; Polymerschmelze ; Reißfestigkeit ; Scherströmung ; Schmelzblasverfahren ; Strömungsfeld ; Theorie-Experiment-Vergleich ; Engineering;
    ISSN: 0888-5885
    E-ISSN: 1520-5045
    Source: American Chemical Society (via CrossRef)
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  • 4
    Language: English
    In: Journal of Applied Polymer Science, 15 February 2012, Vol.123(4), pp.2511-2516
    Description: In this article a method combining the orthogonal array design and the numerical simulation is used to optimize the geometry parameters of the coat‐hanger die with uniform outlet velocity and minimal residence time. The outlet velocity and the residence time are obtained by simulating the three‐dimensional nonisothermal polymer flow in the coat‐hanger die, while the optimal geometry design is accomplished via the orthogonal array method. The effects of the manifold angle, the land height and the slot gap on the outlet velocity and the residence time are investigated. The results show that the effects of all the three parameters are significant for the outlet velocity. For the residence time, the manifold angle and the slot gap are the significant factors, while the effect of the land height is insignificant. The optimal geometry parameters of the coat‐hanger die achieved in this study are that the manifold angle is 5°, the height land is 70 mm, and the slot gap is 3 mm. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
    Keywords: Coat‐Hanger Die ; Orthogonal Array Method ; Simulation ; Residence Time
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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  • 5
    In: Journal of Applied Polymer Science, 15 October 2013, Vol.130(2), pp.1383-1391
    Description: Response surface methodology, based on the four‐factor, three‐level Box‐Behnken design, has been utilized to facilitate a more systematic understanding of the solution and processing parameters of solution blown polyethylene oxide (PEO) micro/nanofibers. The factors investigated include air pressure, solution concentration, nozzle diameter, and injection rate. Fiber diameters, ranging from 137 to 1982 nm, are associated with these variables by applying a response surface model. The linear coefficients of air pressure and solution concentration, the interactive effect between air pressure and injection rate as well as the quadratic terms of nozzle diameter and injection rate are demonstrated statistically significant. Verification of the response surface model is successfully accomplished. Consequently, this study puts forward an overview of the effect of solution and technical parameters on solution blown submicron PEO fibers and provides a train of thought for fabricating other micro/nanofibers. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1383‐1391, 2013
    Keywords: Nanostructured Polymers ; Manufacturing ; Theory And Modeling ; Synthesis And Processing ; Fibers
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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  • 6
    Language: English
    In: Industrial & Engineering Chemistry Research, 01/19/2011, Vol.50(2), pp.1099-1109
    ISSN: 0888-5885
    E-ISSN: 1520-5045
    Source: American Chemical Society (via CrossRef)
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  • 7
    Language: English
    In: Industrial & Engineering Chemistry Research, 02/19/2014, Vol.53(7), pp.2830-2838
    Description: In this work, we investigated the turbulent airflow field of a solution-blowing annular jet using the computational fluid dynamic approach, captured the fiber flapping motion with a high-speed camera, and then correlated the fiber morphology with the physical quantities of the...
    Keywords: Fibers ; Turbulent Flow ; Flapping ; Computational Fluid Dynamics ; Airflow ; Morphology ; Annular ; Fluid Flow ; Analysis (MD) ; Chemical Analysis (Ep) ; Chemical Analysis (Ed) ; Chemical Analysis (EC);
    ISSN: 0888-5885
    E-ISSN: 1520-5045
    Source: American Chemical Society (via CrossRef)
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  • 8
    Language: English
    In: Industrial & Engineering Chemistry Research, 03/23/2016, Vol.55(11), pp.3150-3156
    Description: Nanofibers definitely hold a great advantage and can be applied in many areas because they have very high specific surface area. Recently, great attention is being paid to fabricate nanofiber nonwoven webs using melt-blowing technology. In this paper, melt-blown nanofibers have been produced by multi-hole dies using two kinds of commercial polymers under different processing conditions. The average nanofiber diameters achieved were 780 and 810 nm, respectively. The fiber breakup, which was driven by surface tension when fiber diameters approached nanoscale, was investigated. The Rayleigh instability theory for a melt-blowing fiber was introduced and illustrated as the reason for fiber breakup. Both theory and experimental results reveal that the surface tension, polymer viscosity, fiber diameter, and melt-blowing-process conditions, such as air pressure and temperature, significantly influence the fiber breakup. This research gives a useful understanding for the formation of melt-blown nanofibers and provides a general understanding of the limitations for conditions to achieve nanofibers in a commercial melt-blowing process.
    Keywords: Nanofibers ; Blow-Process ; Surface-Tension ; Polymers ; Fiber-Diameter ; Nonwoven-Fabrics ; Processing-Condition ; Air-Pressure ; Specific-Area ; Nanometer ; Theoretical-Result ; Nanofaser ; Blasverfahren ; Oberflächenspannung ; Polymer ; Faserdurchmesser ; Vliesstoff ; Prozessbedingung ; Luftdruck ; Spezifische Oberfläche ; Nanobereich ; Theoretisches Ergebnis ; Engineering;
    ISSN: 0888-5885
    E-ISSN: 1520-5045
    Source: American Chemical Society (via CrossRef)
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  • 9
    Language: English
    In: Polymer, 13 January 2017, Vol.108, pp.432-441
    Description: Polymer monoliths had wide application possibilities due to their unique porous structures. Non-solvent induced phase separation (NIPS) method was a convenient and simple method to fabricate polymer monolith. In this study, the modeling work of the thermodynamics and dynamics for the polymer/solvent/non-solvent ternary system was carried out. The Flory-Huggins theory was employed to the thermodynamics of the mixed polymer/solvent/non-solvent ternary system, by which the predicted phase diagram was obtained and compared with the experimental results. Cahn-Hilliard model was used to describe the dynamics of the ternary system. The modeling results exhibited a correct type of morphology and pore/skeleton size in dependence on the initial polymer concentration and cooling temperature. Besides, the prediction demonstrated the pore and skeleton forming process during a monolith formation. The quantitative modeling work provided an insight into the formation of polymer monolith by NIPS method, as well as a theoretical reference for controlling the morphology of polymer monolith for practical applications.
    Keywords: Monolith ; Phase Separation ; Flory-Huggins ; Cahn-Hilliard ; Morphology ; Engineering ; Chemistry
    ISSN: 0032-3861
    E-ISSN: 1873-2291
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  • 10
    Language: English
    In: Journal of Applied Polymer Science, 05 February 2010, Vol.115(3), pp.1540-1545
    Description: The air flow field plays a key role in melt blowing. In this article, an optimal design procedure that improves the airflow field of melt blowing is proposed. A parameter, stagnation temperature which is a combination of static temperature and kinetic temperature, is proposed to evaluate the air flow field. The stagnation temperature is obtained via computer simulation, while optimization is accomplished by genetic algorithm. Four main geometry parameters of the slot die: slot width, nose piece width, slot angle, and setback are investigated. The optimal results were achieved in the 40th generation. The results also show that the smaller slot angle and larger slot width can result in the higher stagnation temperature. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
    Keywords: Genetic Algorithm ; Numerical Simulation ; Stagnation Temperature ; Parameter Optimization ; Melt Blowing Slot Die
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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