Air Permeability of Multilayered Nonwoven Fabrics: Comparison of Experimental and Theoretical Results

Mohammadi, M.; Banks‐Lee, P.

doi:10.1177/004051750207200708

Cited by 21 publications

(13 citation statements)

References 9 publications

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“…According to equations (2) and 6, the air permeability would decrease with increase in thickness of non-woven fabrics, and the experimental results showed the same trends (figure 3). However, the predicted values were much higher than the which may be needed to take pore size and pore shape into consideration.…”

Section: The Effect Of Thickness On Air Permeabilitymentioning

confidence: 61%

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Air permeability of polyester nonwoven fabrics

Zhu

Dana

Wang

et al. 2015

Autex Research Journal

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Air permeability is one of the most important properties of non-woven fabrics in many applications. This paper aims to investigate the effects of thickness, porosity and density on the air permeability of needle-punched non-woven fabrics and compare the experimental values with two models which are based on hydraulic radius theory and drag theory, respectively. The air permeability of the samples was measured by an air permeability tester FX3300. The results showed that the air permeability of non-woven fabrics decreased with the increase in thickness and density of samples, increased with the increase of porosity, and the air permeability was not directly proportional to the pressure gradient. Meanwhile, the prediction model based on hydraulic radius theory had a better agreement with experimental values than the model based on drag theory, but the values were much higher than the experimental results, especially for higher porosity and higher pressure gradient.

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Section: The Effect Of Thickness On Air Permeabilitymentioning

confidence: 61%

“…Numerous researchers have worked on the air permeability of non-woven fabrics in both experiment [1][2][3] and analytical prediction [4][5][6][7]. In general, two theories are applied for predicting the air permeability of porous materials: the first based on hydraulic radius theory, and the second based on drag theory.…”

Section: Introductionmentioning

confidence: 99%

Air permeability of polyester nonwoven fabrics

Zhu

Dana

Wang

et al. 2015

Autex Research Journal

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“…The non-uniformity of non-woven fabrics affects their physical and esthetic properties [21]. Also, the non-uniformity of web influences permeability [22], tensile properties [23], and some other properties. One of the most important features of fabrics is their mechanical properties.…”

Section: Tensile Testmentioning

confidence: 99%

Measurement of the Uniformity of Thermally Bonded Points in Polypropylene Spunbonded Non-Wovens Using Image Processing and its Relationship With Their Tensile Properties

Emadi

Tavanaie

Payvandy

2018

Autex Research Journal

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This article aims at the image processing of surface uniformity and thermally bonded points uniformity in polypropylene spunbonded non-wovens. The investigated samples were at two different weights and three levels of non-uniformity. An image processing method based on the k-means clustering algorithm was applied to produce clustered images. The best clustering procedure was selected by using the lowest Davies-Bouldin index. The peak signal-to-noise ratio (PSNR) image quality evaluation method was used to choose the best binary image. Then, the non-woven surface uniformity was calculated using the quadrant method. The uniformity of thermally bonded points was calculated through an image processing method based on morphological operators. The relationships between the numerical outcomes and the empirical results of tensile tests were investigated. The results of image processing and tensile behavior showed that the surface uniformity and the uniformity of thermally bonded points have great impacts on tensile properties at the selected weights and non-uniformity levels. Thus, a sample with a higher level of uniformity and, consequently, more regular bonding points with further bonding percentage depicts the best tensile properties.

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“…Therefore, the effective heat transfer coefficient h e can be calculated by solving Equations (12) and (13):…”

Section: The Maximum Temperature Difference (Shown Inmentioning

confidence: 99%

Study on air permeability and thermal resistance of textiles under heat convection

Zhu

Dana

Wang

et al. 2015

Textile Research Journal

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Convective heat transfer plays a very important role in thermal resistance of textiles due to its porous structure, and the thermal resistance of textiles will be quite different when they are investigated under different testing standards and conditions. Nowadays, however, there is still no commercial instrument for evaluating the thermal resistance of textiles under convective heat transfer. Besides, there is no report about the influence of pore structure (pore size and the ratio of a pore's cross-sectional area to the total cross-sectional area of fabric) on thermal resistance of textiles. Therefore, in this work, one newly designed device has been developed for evaluating the thermal resistance of textiles with different parameters in terms of porosity, pore size and pore cross-sectional area under heat convection. The results showed that with the increase of the pore size and the ratio of pore area to total area of fabric, the air permeability increases and the thermal resistance of fabric decreases; the pore size and the ratio of pore area have more significant influence compared to the influence of porosity; and the thermal resistance decreases with the increase of air permeability.

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Air Permeability of Multilayered Nonwoven Fabrics: Comparison of Experimental and Theoretical Results

Cited by 21 publications

References 9 publications

Air permeability of polyester nonwoven fabrics

Air permeability of polyester nonwoven fabrics

Measurement of the Uniformity of Thermally Bonded Points in Polypropylene Spunbonded Non-Wovens Using Image Processing and its Relationship With Their Tensile Properties

Study on air permeability and thermal resistance of textiles under heat convection

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