A Geometry Method for Calculating the Fiber Diameter Reduction in Melt Blowing

2014 ◽  
Vol 893 ◽  
pp. 87-90 ◽  
Author(s):  
Sheng Xie ◽  
Yong Chun Zeng
Keyword(s):  
High Speed ◽  
Fiber Diameter ◽  
Mechanical Analysis ◽  
Diameter Distribution ◽  
High Speed Photography ◽  
Melt Blowing ◽  
Ultrafine Fibers ◽  
Online Measurements ◽  
Fiber Diameter Distribution ◽  
Diameter Reduction

Melt blowing is one of the important methods for producing ultrafine fibers. The production of melt blowing is the nonwoven. Fiber diameter has crucial effect on the property of the nonwovens. In the melt-blowing process, many achievements have been published on the fiber diameter distribution along the spinning line. Note that all the results were obtained by methods of mechanical analysis, online measurements through high-speed photography and offline measurements from the production of nonwoven. In this study, a new method for calculating the fiber diameter distribution along the spinning line near the die face was revealed. This method was based on the geometry of the fiber path in the melt-blowing process. The fiber diameter reduction was calculated by this method and then compared with the experimental results obtained by other researchers. The results show that the proposed method is feasible.

scholarly journals Ensemble Laser Diffraction for Online Measurement of Fiber Diameter Distribution during the Melt Blowing Process

2004 ◽  
Vol os-13 (2) ◽  
pp. 1558925004os-13 ◽  
Author(s):  
Eric M. Moore ◽  
Robert L. Shambaugh ◽  
Dimitrios V. Papavassiliou
Keyword(s):  
Fiber Diameter ◽  
Pilot Scale ◽  
Laser Diffraction ◽  
Diameter Distribution ◽  
Online Measurement ◽  
Melt Blowing ◽  
Scale Unit ◽  
Slot Die ◽  
Online Measurements ◽  
Fiber Diameter Distribution

Online measurements of the fiber diameter distribution during a melt blowing process were taken using a new laser diffraction technique. This technique measured both the attenuation of the fibers as well as entanglement of the fibers into bundles at large distances from the die. A pilot scale unit with a 20.3 cm (8 inch) slot die was used for the studies. Commercial polypropylene polymer was used. Both the spin-line attenuation and fiber bundling were measured as a function of position both below and across the die face.

The Melt Electrospinning of Polycaprolactone (PCL) Ultrafine Fibers

2008 ◽  
Vol 1134 ◽  
Author(s):  
Chitrabala Subramanian ◽  
Samuel C. Ugbolue ◽  
Steven B. Warner ◽  
Prabir K. Patra
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Process Parameters ◽  
Applied Voltage ◽  
Fiber Diameter ◽  
Diameter Distribution ◽  
Electrospun Fibers ◽  
Ultrafine Fibers ◽  
Melt Electrospinning ◽  
Fiber Diameter Distribution

AbstractElectrospinning is a technique of producing nanofibers from polymer solution/melt solely under the influence of electrostatic forces. In this research, we investigated the formation of nanofibers by melt electrospinning polycaprolactone (PCL). The effect of process parameters such as molecular weight, applied voltage, and electrode separation on the fiber diameter was investigated. Controlling the process parameters could help increase the proportion of ultrafine fibers in the melt electrospun nonwoven mat. The velocity of the straight jets was in the range of 0.2-1 m/s. The melt electrospun fibers were characterized with respect to fiber diameter, distribution, mechanical properties and birefringence. Melt electrospun polycaprolactone fibers had a diameter distribution of the order of 5 -20 μm. The birefringence of the melt electrospun fibers increased with decrease in fiber diameter.

Effect of Introducing Long Chain Branching on Fiber Diameter and Fiber Diameter Distribution in Melt Blowing Process of Polypropylene

2021 ◽  
Vol 36 (4) ◽  
pp. 403-409
Author(s):  
K. Iiba ◽  
W. Takarada ◽  
T. Kikutani
Keyword(s):  
Fiber Diameter ◽  
Viscosity Reduction ◽  
Diameter Distribution ◽  
Polymer Rheology ◽  
Melt Blowing ◽  
Melt Flow Rate ◽  
Long Chain Branching ◽  
Molten Polymers ◽  
Uniform Diameter ◽  
Long Chain

Abstract In the melt blowing process, the molten polymers extruded from nozzles are elongated by high-velocity and high-temperature air flow. In this study, with the aim of stabilizing the melt blowing process for producing nonwoven webs with fine diameter fibers, the effect of the control of polymer rheology by the introduction of either low melt flow rate (MFR) polypropylene (PP) or long chain branched PP (LCB-PP) to regular high MFR PP was investigated. Introduction of low MFR PP into regular PP increased shear viscosity and fibers of larger diameter were produced in the melt blowing process, while introduction of low MFR LCB-PP suppressed the elongational viscosity reduction with the increase of strain rate, and eventually spinning was stabilized. It was found that the blending of an optimum amount of LCB-PP to regular PP caused the stabilization of the melt blowing process. As a result, the formation of nonwoven webs consisting of fine fibers of rather uniform diameter distribution could be achieved.

Simulation of jet velocity in the melt-blowing process using the coupled air–polymer model

2018 ◽  
Vol 89 (16) ◽  
pp. 3221-3233 ◽  
Author(s):  
Xibo Hao ◽  
Hui Huang ◽  
Yongchun Zeng
Keyword(s):  
High Speed ◽  
Flow Model ◽  
Processing Parameters ◽  
High Speed Photography ◽  
Critical Factors ◽  
Polymer Model ◽  
Melt Blowing ◽  
Two Phase ◽  
Jet Velocity ◽  
Jet Velocities

The polymer jet velocity is one of the most basic and critical factors in the melt-blowing process and has always been difficult to measure online. Much effort has been made on the numerical prediction of the jet velocity. However, little work has involved the complex interaction between the air flow and the polymer. Here, the Level-Set method is used to develop the coupled air–polymer two-phase flow model, and to simulate the polymer jet motion in the melt-blowing process considering the coupled effect of the air and polymer. Meanwhile, high-speed photography is adopted in the experiments to verify the simulation results. The x- and y-components of the jet velocities and the whipping amplitude of the jet motion are discussed. The rapid increase of jet velocity and the decrease of jet diameter show that most attenuation of the polymer jet occurred within a distance close to the die (10 mm). Based on the model, the effects of the processing parameters on the jet velocity are examined numerically.

Effects of Solution Parameters on Morphology and Diameter of Electrospun Polystyrene Nanofibers

2011 ◽  
Vol 194-196 ◽  
pp. 629-632 ◽  
Author(s):  
Todsapon Nitanan ◽  
Praneet Opanasopit ◽  
Prasert Akkaramongkolporn ◽  
Theerasak Rojanarata ◽  
Tanasait Ngawhirunpat
Keyword(s):  
Mixed Solvent ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Solvent System ◽  
Diameter Distribution ◽  
Solution Properties ◽  
Fiber Diameter Distribution ◽  
Solution Parameters ◽  
Scanning Electron ◽  
Spun Fibers

This study focused on the preparation of electrospun polystyrene (PS) nanofibers. Polystyrene solutions were prepared in single (dimethylformamide; DMF, dimethylacetamide; DMAc or tetrahydrofuran; THF) and mixed solvent (DMF/THF and DMAc/THF) systems prior to electrospinning. The effects of solution parameters, including PS concentration and solvent system on solution properties (e.g. conductivity and viscosity), appearance and diameter of polystyrene fibers were examined. The morphology of the as-spun fibers were carefully investigated using scanning electron microscopy (SEM). It was found that the average diameter of the as-spun fibers increased upon increasing PS concentration. Moreover, the morphology of the fibers significantly depended on the properties of the solvents. The obtained fibers were smooth without any beads and their diameters depended on the amount of THF in the mixed solvent and PS concentration. In summary, the smallest diameter (927±81 nm) and the narrowest fiber diameter distribution of PS nanofibers were obtained from 15% PS solution in DMF/THF (75/25).

scholarly journals Synthesis of Electrospun Nanofibers Membrane and Its Optimization for Aerosol Filter Application

2016 ◽  
Vol 1 ◽  
Author(s):  
Abdul Rajak
Keyword(s):  
Pressure Drop ◽  
Fiber Diameter ◽  
Polymer Concentration ◽  
Electrospun Nanofibers ◽  
Diameter Distribution ◽  
Air Filtration ◽  
Sem Image ◽  
Aerosol Filtration ◽  
Electrospinning Method ◽  
Fiber Diameter Distribution

Nanofibers membranes were synthesized using electrospinning method for air filtration application. Polyacrylonitrile (PAN) with three different concentrations as the polymeric matrix of the nanofibers membrane is used. In the aerosol filtration, the pressure drop is one of the most important parameters, which is determined by the membrane characteristics. One of the parameters that influence the characteristics of membrane is concentration of polymer solution, in which it will determine the diameter of fiber. In this study, the relation between the PAN concentration and the pressure drop in air filtration test was examined. Three different concentrations of PAN solution (6, 9, and 12 wt.%) were employed under the same process parameters of electrospinning. The fiber diameter distribution of each membrane was measured from its scanning electron microscope (SEM) image. The three concentrations resulted in significant different effect to the pressure drop that proved the existing correlation between the polymer concentration and the air pressure drop.

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