Investigating the effect of raising on the sound absorption behavior of polyester woven fabrics

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5119-5129 ◽  
Author(s):  
Fatih Suvari ◽  
Yasemin Dulek
Keyword(s):  
Sound Absorption ◽  
Volume Fraction ◽  
Unit Area ◽  
Solid Volume Fraction ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Frequency Region ◽  
Acoustical Properties ◽  
Polyester Fibers ◽  
Fabric Surface

This work presents the results of efforts focused on the development of sound absorptive woven fabrics by the raising process. Four woven fabrics with rib and basket weave patterns were produced for the raising process. Micro-fiber-based polyester weft yarns were used in one set of rib and basket weave fabrics, while weft yarns comprising regular polyester fibers were used in the other set. Fabrics were subjected to dyeing and heat setting prior to the raising process. Fabrics were then passed one to three times through the raising unit in order to obtain fabrics with different voluminous characteristics and different quantities of fiber ends on the fabric surface. The mass per unit area, thickness, air permeability, and sound absorption coefficient of the fabrics were measured and surface images of the fabrics were taken. The solid volume fraction and airflow resistivity of the fabrics decreased significantly after the first and second raising passes. Increasing the number of raising passes up to two passes resulted in higher sound absorption (average increment of 20% at 5 kHz) in the higher frequencies at the expense of that in the lower frequencies. Sound absorption change beyond two passes was insignificant, though. The results demonstrated that raised fabrics having a lower solid volume fraction and airflow resistivity had better acoustical properties in the higher frequency region.

The effect of physical parameters on sound absorption properties of natural fiber mixed nonwoven composites

2012 ◽  
Vol 82 (20) ◽  
pp. 2043-2053 ◽  
Author(s):  
Merve Küçük ◽  
Yasemin Korkmaz
Keyword(s):  
Absorption Coefficient ◽  
High Frequency ◽  
Sound Absorption ◽  
Natural Fiber ◽  
Unit Area ◽  
Air Permeability ◽  
Physical Parameters ◽  
Fiber Types ◽  
Absorption Properties ◽  
Nonwoven Fabrics

In this study, the effects of physical parameters on sound absorption properties of nonwoven fabrics were investigated. Eight different nonwoven composites including different fiber types mixed with different ratios were tested. Along with sound absorption properties, thickness, weight per area, and air permeability parameters of the samples were measured. The increase in thickness and the decrease in air permeability results in an increase in sound absorption properties of the material. The samples including 70% cotton and 30% polyester resulted in the best sound absorption coefficient in the mid-to-high frequency ranges. The increase in the amount of fiber per unit area resulted in an increase in sound absorption of the material. Addition of acrylic and polypropylene into a cotton and polyester fiber mixture increased the sound absorption properties of the composite in the low and mid-frequency ranges also.

Acoustical analysis of corduroy fabric for sound absorption: Experiments and simulations

2017 ◽  
Vol 48 (1) ◽  
pp. 201-220 ◽  
Author(s):  
Xiaoning Tang ◽  
Xiansheng Zhang ◽  
Xingmin Zhuang ◽  
Huiping Zhang ◽  
Xiong Yan
Keyword(s):  
Surface Density ◽  
Sound Absorption ◽  
Air Permeability ◽  
Acoustic Absorption ◽  
Interior Decoration ◽  
Airflow Resistance ◽  
Acoustical Properties ◽  
Acoustical Analysis ◽  
Acoustic Absorption Coefficient ◽  
The Difference

Corduroy fabrics have been widely used in interior decoration currently. This work mainly investigated the acoustical properties of corduroy fabrics in relation to air permeability and airflow resistance. Five specimens with similar surface density and different wale width are used. The results indicated that corduroy fabrics with thicker wale width exhibited higher air permeability and lower airflow resistance. Furthermore, the increased width of wale is beneficial to improve the acoustic absorption of corduroy fabric. Two models based on air permeability and airflow resistance are taken to characterize the acoustical behavior. It has been indicated that Pieren model could well predict the acoustic absorption coefficient of corduroy fabric, and the difference of acoustic absorption is due to the varied air permeability and airflow resistance resulting from the different wale width.

scholarly journals The role of staple fiber length on the performance of carded, hydroentangled nonwovens produced with polypropylene fibers

2019 ◽  
Vol 14 ◽  
pp. 155892501987005
Author(s):  
Jordan Tabor ◽  
Carl Wust ◽  
Behnam Pourdeyhimi
Keyword(s):  
Fiber Length ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Air Permeability ◽  
Polypropylene Fibers ◽  
Staple Fiber ◽  
Structure Property ◽  
Forming Process ◽  
Nonwoven Fabrics ◽  
Electron Microscopy Analysis

Carding is a common web-forming process used for staple fibers in the nonwovens industry. Staple fibers may be produced in many different lengths. However, the effect of staple fiber length on the nonwoven carding process and structure–property relationships of carded, hydroentangled nonwoven fabrics is not well understood. During this research, polypropylene fibers with lengths ranging from 2.54 to 15.24 cm were produced, carded, and bonded by hydroentangling. All fiber lengths used during this research were successfully carded. Fabrics were characterized via scanning electron microscopy analysis as well as basis weight, thickness, and solid volume fraction measurements. Fabric performance was evaluated with air permeability and burst strength testing. Data sets were statistically evaluated with one-way and two-way analysis of variance to determine whether fiber length significantly affected fabric structure and properties. In general, the fabrics’ solid volume fractions and burst strengths were not significantly affected by fiber length. However, air permeability of the samples did show significant change with fiber length.

scholarly journals The role of staple fiber length on the performance of carded, hydroentangled nonwovens produced with splittable fibers

2019 ◽  
Vol 14 ◽  
pp. 155892501983252
Author(s):  
Jordan Tabor ◽  
Carl Wust ◽  
Behnam Pourdeyhimi
Keyword(s):  
Fiber Length ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Air Permeability ◽  
Staple Fiber ◽  
Structure Property ◽  
Forming Process ◽  
Burst Strength ◽  
Bicomponent Fibers ◽  
Nonwoven Fabrics

Carding is a common web-forming process used for staple fibers in the nonwovens industry. Carded webs can be produced with bicomponent staple fibers designed to split into fine fibers. Splittable bicomponent fibers offer benefits such as increased surface area, improved hand, decreased pore size, improved cover, and enhanced strength. Splittable bicomponent fibers within carded webs can be split and bonded utilizing high-pressure water jets during the hydroentangling process. Staple fibers may be produced in many different lengths. However, the effect of staple fiber length on the nonwoven carding process and structure–property relationships of carded, hydroentangled nonwoven fabrics composed of splittable bicomponent fibers is not well understood. During this research, polyester/polyethylene 16-segmented pie, bicomponent fibers with lengths ranging from 2.54 to 15.24 cm were produced, carded and bonded by hydroentangling. All fiber lengths used during this research were successfully carded, and no significant challenges were observed during carding. Fabric performance was evaluated with air permeability and burst strength testing. Data sets were statistically evaluated with one-way and two-way analysis of variance to determine whether fiber length significantly affected fabric structure and properties. In general, the solid volume fraction and air permeability of the samples were affected by fiber length. However, fiber length did not strongly affect the burst strength of hydroentangled fabrics.

Preparation and properties of polyimide air-jet textured yarns and their woven fabrics

2019 ◽  
Vol 90 (13-14) ◽  
pp. 1507-1516
Author(s):  
Shuting Huang ◽  
Lina Sun ◽  
Mengjuan He ◽  
Jingli Tang ◽  
Liqian Huang
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Contact Angle ◽  
Heat Resistance ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Warp Yarn ◽  
Air Jet ◽  
Rough Model ◽  
Fabric Surface

Two kinds of air-textured polyimide yarns with different overfeed ratios (0.5/2 and 8/8) were prepared by air-jet texturing technique, and three kinds of woven fabrics with similar tightness and thickness were produced with the same warp yarn but different weft yarns (polyimide flat yarn and the two air-jet textured polyimide yarns, respectively). The influence of air-jet textured yarn on the wearing properties of the fabrics was explored. The results show that, compared with the fabric containing polyimide flat yarn, the fabrics woven with polyimide air-jet textured yarns possess lower mechanical properties but have better air permeability, moisture permeability, heat resistance and luster. In addition, the smaller contact angle and larger wicking height of polyimide air-jet textured yarn fabrics indicate that the hydrophilicity of polyimide fabrics was improved. The effect of air-jet textured yarn on the hydrophilicity of polyimide fabrics was explained by Wenzel rough model and fabric surface roughness characteristics.

Study on Pore Structure of Multi-Layered Spunbonded Nonwovens

2013 ◽  
Vol 750-752 ◽  
pp. 103-106
Author(s):  
Chen Yan Zhu ◽  
Wei Wei Ying ◽  
Xiao Fang Zhan ◽  
Xin Lei
Keyword(s):  
Pore Structure ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Air Permeability ◽  
Layer Number ◽  
Structure Morphology ◽  
Maximum Pore Size ◽  
Morphology Characteristics

In this study, three kinds of single-layered spunbonded nonwovens with different specifications were prepared as materials. The relation between layer number and pore structure (morphology characteristics, pore size and pore distribution, and Solid Volume Fraction) was studied. The results show that mean pore size decreases as layer number increases and the degree tends to be gentle. But the change law of maximum pore size is not obvious. Furthermore, pore size distribution of single-layered or two-layered nonwovens is concentrated and further increase in layer number doesnt have obvious effects on it . Air permeability reduces when the layer number increases and the variation trend accords with that of mean pore size.

Influence of sea polymer removal on sound absorption behavior of islands-in-the-sea spunbonded nonwovens

2018 ◽  
Vol 89 (12) ◽  
pp. 2444-2455 ◽  
Author(s):  
Fatih Suvari ◽  
Yusuf Ulcay ◽  
Behnam Pourdeyhimi
Keyword(s):  
High Pressure ◽  
Cross Sections ◽  
Sound Absorption ◽  
Air Permeability ◽  
Absorption Coefficients ◽  
Acoustical Properties ◽  
Water Jets ◽  
Before And After ◽  
Pressure Water ◽  
Air Streams

This work presents the results of efforts focused on the development of relatively lightweight and fibrous acoustic webs. For this objective, nonwoven webs that contain bicomponent filaments with islands-in-the-sea cross sections were produced by spunbonding, which involves the extrusion of sea and island polymer melts through dies, cooling and attenuating the bicomponent filaments by high-velocity air streams. Nylon 6 and polyethylene were used as the island and sea polymers, respectively. Webs were hydroentangled with high-pressure water jets prior to the dissolving process to obtain fiber entanglement. Sea polymer was removed from the spunbonded nonwovens by using a reflux dissolution setup. Weight, thickness, air permeability, pore size and sound absorption coefficients of the nonwoven samples were measured before and after the sea polymer removal. Results demonstrated that sea polymer removal led to further bicomponent filament fibrillation, which affected sound absorption positively. The structure with the higher number of island fibers had better acoustical properties. Lightweight and fibrous acoustic nonwovens can be obtained with the method given in this study.

Ciliary Flow of Casson Nanofluid with the Influence of MHD having Carbon Nanotubes

2020 ◽  
Vol 16 ◽  
Author(s):  
Adel Alblawi ◽  
Saba Keyani ◽  
S. Nadeem ◽  
Alibek Issakhov ◽  
Ibrahim M. Alarifi
Keyword(s):  
Carbon Nanotubes ◽  
Velocity Profile ◽  
Pressure Gradient ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Pressure Rise ◽  
Shear Stresses ◽  
Left Wall ◽  
Coupled Equations ◽  
The Right

Objective: In this paper, we consider a model that describes the ciliary beating in the form of metachronal waves along with the effects of Magnetohydrodynamic fluid over a curved channel with slip effects. This work aims at evaluating the effect of Magnetohydrodynamic (MHD) on the steady two dimensional (2-D) mixed convection flow induced in carbon nanotubes. The work is done for both the single wall nanotube and multiple wall nanotube. The right wall and the left wall possess a metachronal wave that is travelling along the outer boundary of the channel. Methods: The wavelength is considered as very large for cilia induced MHD flow. The governing linear coupled equations are simplified by considering the approximations of long wavelength and small Reynolds number. Exact solutions are obtained for temperature and velocity profile. The analytical expressions for the pressure gradient and wall shear stresses are obtained. Term for pressure rise is obtained by applying Numerical integration method. Results: Numerical results of velocity profile are mentioned in a table form, for various values of solid volume fraction, curvature, Hartmann number [M] and Casson fluid parameter [ζ]. Final section of this paper is devoted to discussing the graphical results of temperature, pressure gradient, pressure rise, shear stresses and stream functions. Conclusion: Velocity profile near the right wall of the channel decreases when we add nanoparticles into our base fluid, whereas an opposite behaviour is depicted near the left wall due to ciliated tips whereas the temperature is an increasing function of B and ߛ and decreasing function of ߶.

scholarly journals Quantification of shear viscosity and wall slip velocity of highly concentrated suspensions with non-Newtonian matrices in pressure driven flows

2021 ◽  
Author(s):  
Patrick Wilms ◽  
Jan Wieringa ◽  
Theo Blijdenstein ◽  
Kees van Malssen ◽  
Reinhard Kohlus
Keyword(s):  
Shear Stress ◽  
Liquid Phase ◽  
Shear Rate ◽  
Shear Viscosity ◽  
Slip Velocity ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Wall Slip ◽  
Flow Index ◽  
Concentrated Suspensions

AbstractThe rheological characterization of concentrated suspensions is complicated by the heterogeneous nature of their flow. In this contribution, the shear viscosity and wall slip velocity are quantified for highly concentrated suspensions (solid volume fractions of 0.55–0.60, D4,3 ~ 5 µm). The shear viscosity was determined using a high-pressure capillary rheometer equipped with a 3D-printed die that has a grooved surface of the internal flow channel. The wall slip velocity was then calculated from the difference between the apparent shear rates through a rough and smooth die, at identical wall shear stress. The influence of liquid phase rheology on the wall slip velocity was investigated by using different thickeners, resulting in different degrees of shear rate dependency, i.e. the flow indices varied between 0.20 and 1.00. The wall slip velocity scaled with the flow index of the liquid phase at a solid volume fraction of 0.60 and showed increasingly large deviations with decreasing solid volume fraction. It is hypothesized that these deviations are related to shear-induced migration of solids and macromolecules due to the large shear stress and shear rate gradients.

scholarly journals Factors Affecting Acoustic Properties of Natural-Fiber-Based Materials and Composites: A Review

Textiles ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 55-85
Author(s):  
Tufail Hassan ◽  
Hafsa Jamshaid ◽  
Rajesh Mishra ◽  
Muhammad Qamar Khan ◽  
Michal Petru ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Fiber Type ◽  
Alkali Treatment ◽  
Acoustic Properties ◽  
Synthetic Fiber ◽  
Sound Insulation ◽  
Factors Affecting ◽  
Wide Range

Recently, very rapid growth has been observed in the innovations and use of natural-fiber-based materials and composites for acoustic applications due to their environmentally friendly nature, low cost, and good acoustic absorption capability. However, there are still challenges for researchers to improve the mechanical and acoustic properties of natural fiber composites. In contrast, synthetic fiber-based composites have good mechanical properties and can be used in a wide range of structural and automotive applications. This review aims to provide a short overview of the different factors that affect the acoustic properties of natural-fiber-based materials and composites. The various factors that influence acoustic performance are fiber type, fineness, length, orientation, density, volume fraction in the composite, thickness, level of compression, and design. The details of various factors affecting the acoustic behavior of the fiber-based composites are described. Natural-fiber-based composites exhibit relatively good sound absorption capability due to their porous structure. Surface modification by alkali treatment can enhance the sound absorption performance. These materials can be used in buildings and interiors for efficient sound insulation.

Sign in / Sign up

Export Citation Format

Share Document