The Effects of Processing Parameter on Melt-Blown Filtration Materials

2013 ◽  
Vol 650 ◽  
pp. 78-84 ◽  
Author(s):  
Qing Yan Xu ◽  
Yin Min Wang
Keyword(s):  
Pore Size ◽  
Air Temperature ◽  
Surface Density ◽  
Fiber Diameter ◽  
Air Permeability ◽  
Structure And Properties ◽  
Breaking Force ◽  
Processing Parameter ◽  
Nonwoven Fabrics ◽  
Web Structure

The preparation of melt-blown filtration materials was studied in this paper. The effects of collection distance, screw speed, air temperature on web structure and properties were discussed, and moreover, fiber diameter, thickness, surface density, pore size, air permeability and breaking force of PP nonwoven fabrics were characterized in this paper.

scholarly journals Development of Needle-Punched Nonwoven Fabrics from Reclaimed Fibers for Air Filtration Applications

2014 ◽  
Vol 9 (1) ◽  
pp. 155892501400900 ◽  
Author(s):  
S. Sakthivel ◽  
Anban J.J. Ezhil ◽  
T. Ramachandran
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Air Permeability ◽  
Filtration Efficiency ◽  
Raw Material ◽  
Fine Tuning ◽  
Physical Parameters ◽  
Air Filtration ◽  
Nonwoven Fabrics

This paper reports an investigative study on the fabrication and measurement of the air permeability, mechanical properties, pore size distribution, and filtration efficiency of different nonwoven fabrics produced from reclaimed fibers by analytically changing the machine variables to manipulate the physical parameters of the nonwoven fabrics. Reclaimed fiber of cotton (60%) and polyester (40%) blend was used, so that the prospect of value addition to an inexpensive source of raw material could be explored. The changes in air permeability were interpreted in terms of fabric density profile and pore size distribution. The filtration parameters of filtration efficiency, dust holding capacity, and pressure drop were also calculated. Additionally, the effects of calendering on pore size and filtration properties were evaluated to discover the opportunity of fine-tuning and the performance of the filters. The outcome in this study reflected an overall development in all filtration characteristics due to the calendering operation.

Influence of Heat-Stretching Treatment on Structure and Properties of Bico MB Nonwoven Webs

2004 ◽  
Vol os-13 (1) ◽  
pp. 1558925004os-13
Author(s):  
Dong Zhang ◽  
Christine (Qin) Sun ◽  
Yanbo Liu
Keyword(s):  
Tensile Strength ◽  
Air Permeability ◽  
Bending Stiffness ◽  
Structure And Properties ◽  
Machine Direction ◽  
Fiber Splitting ◽  
Web Structure ◽  
Treatment Changes ◽  
The Web

Heat stretching treatment (HST) to side-by-side bicomponent meltblown webs has been carried out on the Stretch Consolidation Pilot Line at the UTK-TANDEC Demonstration Laboratory, to examine the influence of HST on the web structure and properties. The results showed that the fibers aligned preferentially along machine direction after the treatment. Changes in the web structure and properties were studied, including basis weight, thickness, air permeability, tensile strength, bending stiffness, as well as extension recovery (%) from the strain of 50% elongation-to-break, etc. No fiber splitting was observed, which indicated that HST did not result in fiber splitting in the bicomponent meltblown webs as desired.

Pore Size and Air Permeability of Four Nonwoven Fabrics

2000 ◽  
Vol os-9 (2) ◽  
pp. 1558925000OS-90 ◽  
Author(s):  
Helen H. Epps ◽  
Karen K. Leonas
Keyword(s):  
Pore Size ◽  
Air Permeability ◽  
Mean Flow ◽  
Pore Sizes ◽  
Nonwoven Fabrics ◽  
Maximum Pore Size ◽  
Highly Correlated ◽  
Fabric Weight ◽  
The Relationship

The relationship between pore size and air permeability in two spunlaced fabrics and two spunbonded/meltblown/spunbonded (SMS) fabrics were investigated. Minimum, maximum and mean flow pore sizes were determined using liquid porosimetry. The influence of fabric weight and thickness on air permeability and pore sizes was also evaluated. For the spunlaced fabrics, air permeability was most highly correlated with mean flow pore size, while there was a significant correlation between air permeability and maximum pore size for the SMS fabrics. Liquid porosimetry is a useful technique in assessing pore sizes of nonwoven fabrics and can also aid in understanding the mechanism of air permeability.

Performance of Electrospun Polyvinylidene Fluoride Nanofibrous Membrane in Air Filtration

2020 ◽  
Vol 20 (4) ◽  
pp. 552-559
Author(s):  
Yuanxiang Xiao ◽  
Enlong Wen ◽  
Nazmus Sakib ◽  
Zhonghua Yue ◽  
Yan Wang ◽  
...  
Keyword(s):  
Pore Size ◽  
Polyvinylidene Fluoride ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Solution Concentration ◽  
Air Permeability ◽  
Filtration Efficiency ◽  
Experimental Results ◽  
Fibrous Membrane ◽  
Predicted Values

AbstractPolyvinylidene fluoride (PVDF) fibrous membranes with fiber diameter from nanoscale to microscale were prepared by electrospinning. The structural parameters of PVDF fibrous membrane in terms of fiber diameter, pore size and its distribution, porosity or packing density, thickness, and areal weight were tested. The relationship between solution concentration and structural parameters of fibrous membrane was analyzed. The filtration performance of PVDF fibrous membrane in terms of air permeability and filtration efficiency was evaluated. The results demonstrated that the higher solution concentration led to a larger fiber diameter and higher areal weight of fibrous membrane. However, no regular change was found in thickness, porosity, or pore size of fibrous membrane under different solution concentrations. The air permeability and filtration efficiency of fibrous membrane had positive correlations with pore size. The experimental results of filtration efficiency were compared with the predicted values from current theoretical models based on single fiber filtration efficiency. However, the predicted values did not have a good agreement with experimental results since the fiber diameter was in nanoscale and the ratio of particle size to fiber diameter was much larger than the value that the theoretical model requires.

Study on the Relationship Between Structure Parameters and Filtration Performance of Polypropylene Meltblown Nonwovens

2020 ◽  
Vol 20 (4) ◽  
pp. 366-371 ◽  
Author(s):  
Yuanxiang Xiao ◽  
Nazmus Sakib ◽  
Zhonghua Yue ◽  
Yan Wang ◽  
Si Cheng ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Pore Size ◽  
Pore Diameter ◽  
Fiber Diameter ◽  
Areal Density ◽  
Nonwoven Fabric ◽  
Filtration Efficiency ◽  
Structure Parameters ◽  
Nonwoven Fabrics ◽  
Wide Range

AbstractIn this study, polypropylene meltblown nonwoven fabrics with different structure parameters such as fiber diameter, pore size, and areal density were prepared by the industrial production line. The morphology of meltblown nonwoven fibers was evaluated by using scanning electron microscope, and the diameter of fibers was analyzed by using image-pro plus software from at least 200 measurements. The pore size of nonwoven fabric was characterized by a CFP-1500AE type pore size analyzer. The filtration efficiency and pressure drop were evaluated by TSI8130 automatic filter. The results showed that the pressure drop of nonwoven fabrics decreased with the increase in pore size; the filtration efficiency and the pressure drop had a positive correlation with the areal density. However, when the areal density is in the range of 27–29 g/m2, both filtration efficiency and pressure drop decreased with the increase of areal density; when the areal density was kept constant, the filtration efficiency decreased as the pore size decreased; when the pore size of the meltblown nonwoven fabric is less than 17 μm, the filtration efficiency increased as the pore diameter decreased; when the pore diameter of the nonwoven fabric is larger than 17 μm. In a wide range, the pressure drop decreased as the fiber diameter decreased.

scholarly journals Designing Nonwovens to Meet Pore Size Specifications

2007 ◽  
Vol 2 (1) ◽  
pp. 155892500700200 ◽  
Author(s):  
Glen E. Simmonds ◽  
John D. Bomberger ◽  
Michael A. Bryner
Keyword(s):  
Mathematical Models ◽  
Pore Size ◽  
Fiber Diameter ◽  
Complete Separation ◽  
Mean Flow ◽  
Excellent Correlation ◽  
Fabric Thickness ◽  
Nonwoven Fabrics ◽  
Target Values ◽  
The Mean

New nonwovens applications in areas such as filtration require a media designed to particular pore size specifications in the 3 to 20 micron range. The purpose of this work was to develop a basis by which to design and construct a fabric with given pore size specifications. While doing so we have provided a validation for two different mathematical models. We have also found that bicomponent spunbonded islands-in-the-sea nonwoven fabrics can be designed very precisely to achieve target pore diameters and porosity. Mathematical models can be used to develop fabric specifications in the standard manufacturing terms of basis weight and fiber diameter. Measured mean flow pore diameters for the test fabrics showed excellent correlation to targeted mean flow pore diameters for both models. The experimental fit to the Bryner model is the better of the two, but requires specification of fabric thickness in addition to basis weight and fiber diameter to achieve actual mean pore diameters that closely match target values. Experimental validation of the influence of fabric thickness on the mean flow pore diameter at constant basis weight and fiber diameter remains open for further investigation. In addition, achieving complete separation of the island and sea polymers along with unbundling of the island fibers remain areas for improvement.

Effect of surface density and fiber length on the porosity and permeability of nonwoven flax reinforcement

2017 ◽  
Vol 88 (15) ◽  
pp. 1776-1787 ◽  
Author(s):  
Mohamed Habibi ◽  
Édu Ruiz ◽  
Gilbert Lebrun ◽  
Luc Laperrière
Keyword(s):  
Pore Size ◽  
Surface Density ◽  
Fiber Length ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Short Fiber ◽  
Fiber Volume ◽  
Fibrous Network ◽  
Porosity And Permeability ◽  
The Impact

This paper presents an experimental study and modeling of the influence of surface density and fiber length on the permeability of novel nonwoven flax fiber manufactured by the paper making process. Firstly, the relation between surface density, fiber lengths and pore size distribution measured with a porometer capillary instrument is reported in this study. The results show that higher surface density gives a denser fibrous network with a low porosity rate and longer fiber decreases the total number of fibers and increases the pore size for a given surface density. A liquid permeability study was then carried out to identify the impact of surface density, short fiber length and fiber volume fraction on in-plane impregnation of the reinforcement. Permeability was found to be inversely proportional to the reinforcement of surface density. In contrast, an increase of the fiber length increases the in-plane permeability of the reinforcement. Finally, a mathematical modeling is proposed to predict the permeability behavior of these innovative natural fiber webs.

Air Permeability of Multilayer Needle Punched Nonwoven Fabrics

2019 ◽  
Vol 50 (5) ◽  
pp. 457-461
Author(s):  
A. G. Evdokimov ◽  
A. V. Dedov ◽  
V. G. Nazarov
Keyword(s):  
Air Permeability ◽  
Nonwoven Fabrics

scholarly journals New Approach for Determining Tortuosity in Fibrous Porous Media

2010 ◽  
Vol 5 (3) ◽  
pp. 155892501000500 ◽  
Author(s):  
Rahul Vallabh ◽  
Pamela Banks-Lee ◽  
Abdel-Fattah Seyam
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Fiber Diameter ◽  
Empirical Relationship ◽  
Air Permeability ◽  
New Approach ◽  
Upper Limits ◽  
Fibrous Porous Media ◽  
Flow Through

A method to determine tortuosity in a fibrous porous medium is proposed. A new approach for sample preparation and testing has been followed to establish a relationship between air permeability and fiberweb thickness which formed the basis for the determination of tortuosity in fibrous porous media. An empirical relationship between tortuosity and fiberweb structural properties including porosity, fiber diameter and fiberweb thickness has been proposed unlike the models in the literature which have expressed tortuosity as a function of porosity only. Transverse air flow through a fibrous porous media increasingly becomes less tortuous with increasing porosity, with the value of tortuosity approaching 1 at upper limits of porosity. Tortuosity also decreased with increase in fiber diameter whereas increase in fiberweb thickness resulted in the increase in tortuosity within the range of fiberweb thickness tested.

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