Analysis of Multiple Jets in the Schwarz Melt-Blowing Die Using Computational Fluid Dynamics

Krutka, Holly; Shambaugh, and Robert L.; Papavassiliou, Dimitrios V.

doi:10.1021/ie0505864

Cited by 26 publications

(29 citation statements)

References 19 publications

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“…Until now, the air flow fields in melt blowing have been researched mostly by methods of computational fluid dynamics (CFD) numerical simulation and experimental measurement. Shambaugh and his co-workers [3][4][5][6][7] have systematically numerical simulated the air flow fields in different kinds of die melt blowing, including slot die, annular die and swirl die. Their numerical simulations obtained the profiles of the whole air flow fields including the profiles of air velocity and temperature.…”

Section: Introductionmentioning

confidence: 99%

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

et al. 2018

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Melt blowing is an industrial approach for producing microfibrous nonwoven materials utilizing high-speed air to attenuate polymer melt. The melt-blowing air flow field which is widely believed to be turbulence determines the process of fiber formation. In this study, the turbulent air flow field in slot-die melt blowing was experimental measured by hot-wire anemometer. The fluctuations of air velocity and temperature, the mean velocity and mean temperature were measured and analyzed; moreover, the relationship between turbulent air flow field and fiber formation in melt blowing was discussed and predicted. In the last part of this paper, the coupling effect of air temperature and velocity was studied tentatively, results showed that air temperature not only had an enhanced effect on velocity, but contributed to the fluctuation of velocity. This work shows that the fluctuating characteristics of air velocity and temperature have dominant effect on fiber motion and the evenness of fiber diameter.

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Section: Introductionmentioning

confidence: 99%

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

et al. 2018

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“…Higher maximum centerline air velocity in the z‐direction, is favorable as it leads to an increased rate of fiber attenuation (i.e., finer fiber) for a given air throughput. Krutka et al . analyzed the multiple jets in the biaxial MB die and investigated the effect of the interaction of the multiple rows and columns on the air flow field below the die face.…”

Section: Introductionmentioning

confidence: 82%

“…Several studies have however been conducted on the slot MB die and its performance, including examining methods to reduce the fabricated fiber diameter, improving, and controlling the web filtration properties, and investigating the effect of die geometry on process aerodynamics and fiber properties . Several one‐, two‐, and three‐dimensional models have also been developed for the slot MB die .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of micro‐meltblown filtration media using parallel plate die design

Hassan

Khan

Pourdeyhimi

2015

J of Applied Polymer Sci

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Meltblown fibers are typically produced using a die technology based on the slot concept, an extension of the sheet die technology with a series of holes substituting the center rectangular slot of the sheet die. While this prevalent technology has met with considerable success, an economical, facile design would be desirable. In this study a new parallel plate die concept to fabricate micro-meltblown fibers that offers simplicity, ease of use, and low cost was examined. The new die concept had parallel plates forming channels for polymer melt to flow through with a set of air holes surrounding them. This die design produced meltblown fibrous media with fibers in the range of 3-10 lm with pore size between 20 and 60 microns. The underlying mechanisms leading to such large fiber size formation and its implication in air filtration performance has been discussed. While conventional meltblown die generates fibers of smaller diameter and webs with higher filtration efficiency than the parallel plate geometry, design modifications could enhance the parallel plate meltblown die performance and make it a viable alternative. These die adaptations that include reducing air flow resistance, increasing the number of air nozzles around the polymer nozzles, recessing the polymer spinnerets above the die face, and having inclined air channels to increase the drag force on the fibers has been discussed.

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“…An air drawing model of polymer consists of a continuity, a momentum, an energy, and constitutive equation .…”

Section: The Air Drawing Model Of Spunbonding Polymermentioning

confidence: 99%

Experimental study and numerical simulation the air jet flow field of a dual slot sharp blunt die in the melt blowing nonwoven process

2016

Polymer Engineering & Sci

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In this work, the physical model of a polymer in a melt blowing process is established and solved by introducing the numerical computation results of the air jet flow field of the dual slot sharp inset die. The influence of the melt blowing processing parameters and the die design parameters on the fiber diameter is also studied. A lower polymer throughput rate, higher polymer melt initial temperature, higher air initial temperature, higher air initial velocity, smaller angle between slot and axis of the spinneret, smaller width of the die head, and larger width of the slot can all produce finer fibers. At the same time, the air jet flow field model of the dual slot sharp inset die of polypropylene polymer nonwovens fabrics in melt blowing process was also established. The air jet flow field model was solved by using the finite difference method. The computational simulation results of the distributions of the z-components of air temperature and air velocity along the spinline during melt blowing process are in accordance with the experimental data. The air drawing model of melt blowing process was simulated by means of the numerical simulation results of the air jet flow field. The predicted fiber diameter agree with the experimental data. The effects of the air initial velocity and air initial temperature on the fiber diameter were studied and discussed. The results demonstrate that a higher air initial velocity and a higher air initial temperature are beneficial to the air drawing of the polymer melt and thus to reduced fiber diameter. The results show the great potential of this research for computer assisted design in melt blowing nonwoven process and technology. POLYM. ENG. SCI.,

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Analysis of Multiple Jets in the Schwarz Melt-Blowing Die Using Computational Fluid Dynamics

Cited by 26 publications

References 19 publications

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

Fabrication of micro‐meltblown filtration media using parallel plate die design

Experimental study and numerical simulation the air jet flow field of a dual slot sharp blunt die in the melt blowing nonwoven process

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