scholarly journals Garment Waste Recycled Cotton/Polyester Thermal and Acoustic Properties of Air-Laid Nonwovens

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
S. Sakthivel ◽  
Bahiru Melese ◽  
Ashenafi Edae ◽  
Fasika Abedom ◽  
Seblework Mekonnen ◽  
...  
Keyword(s):  
Moisture Absorption ◽  
Research Work ◽  
Polyester Fiber ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
High Humidity ◽  
Absorption Coefficients ◽  
Recycled Pet ◽  
Fiber Properties ◽  
Nonwoven Mats

This research paper reports a study on thermal and sound insulation samples developed from garment waste recycled cotton/polyester fiber (recycled cotton/PET) for construction industry applications. In this research work, the piece of clothing waste recycled cotton and polyester fiber is a potential source of raw material for thermal and sound insulation applications, but its quantities are limited. To overcome the above problems, apparel waste recycled cotton fiber was mixed with recycled/PET fiber in 50/50 proportions in the form of two-layer nonwoven mats with chemical bonding methods. The samples such as cotton (color and white), polyester (color and white), and cotton–polyester blend (color and white) were prepared. All the samples were tested for thermal insulation, acoustic, moisture absorption, and fiber properties as per the ASTM Standard. Also, the behavior of the six recycled cotton/polyester nonwoven samples under high humidity conditions was evaluated. The sound absorption coefficients were measured according to ASTM E 1050 by an impedance tube method; the acoustics absorption coefficients over six frequencies of 125, 250, 500, 1000, 2000, and 4000 Hz were calculated. The result revealed that recycled/PET/cotton garment waste nonwoven mats were absorbing the sound resistance of more than 70% and the recycled nonwoven mats provided the best insulation, acoustic, moisture absorption, and fiber properties. The recycled pieces of clothing waste cotton/polyester nonwoven mats have adequate moisture resistance at high humidity conditions without affecting the insulation and acoustic properties.

scholarly journals Thermal and sound insulation properties of recycled cotton/polyester chemical bonded nonwovens

2020 ◽  
Vol 15 ◽  
pp. 155892502096881
Author(s):  
Santhanam Sakthivel ◽  
Selvaraj Senthil Kumar ◽  
Seblework Mekonnen ◽  
Eshetu Solomon
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Moisture Absorption ◽  
Raw Material ◽  
Sound Absorption Coefficient ◽  
Sound Insulation ◽  
High Humidity ◽  
Recycled Pet ◽  
Fiber Properties ◽  
Nonwoven Mats

This research paper reports a study on thermal and sound insulation samples developed from recycled cotton/polyester (recycled cotton/PET) for construction industry applications. The waste recycled cotton and polyester fiber is a potential source of raw material that can be considered for thermal and sound insulation applications, but its quantities are limited. While the quantities are limited, waste recycled cotton fiber was mixed with recycled/PET fiber in 50/50 proportions in the form of two-layer nonwoven mats with a chemical bonding method. The samples such as cotton (color and white), polyester (color and white), and cotton-polyester blend (color and white) were prepared. All the samples were tested for thermal insulation, sound absorption, moisture absorption, and fiber properties as per the ASTM standard. Also, behaviors of six recycled cotton/polyester nonwoven samples under high humidity conditions were evaluated. The sound absorption coefficients were measured according to ASTM E 1050 by an impedance tube method, the sound absorption coefficient over six frequencies 125, 250, 500, 1000, 2000, and 4000 Hz were calculated. The result revealed that nonwoven mats that are prepared from recycled/PET/cotton waste have confirmed more than 70% of the sound absorption coefficient and the recycled nonwoven mats provided the best insulation, sound absorption, moisture absorption, and fiber properties. The recycled waste cotton/ polyester nonwoven mats have adequate moisture resistance at high humidity conditions without affecting the insulation and sound-absorbing properties.

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.

Features and Current Damaged Situation of Hui-Style Architecture

2013 ◽  
Vol 838-841 ◽  
pp. 2905-2909
Author(s):  
Xue Yu Xiong ◽  
Zhao Yang Su
Keyword(s):  
Natural Hazards ◽  
Sound Insulation ◽  
High Humidity ◽  
Deep Well ◽  
Long Time ◽  
Wood Carving ◽  
Stone Carving ◽  
White Wall ◽  
Reinforcement Measures ◽  
Near Future

As the key element of Huizhou culture, Hui-style architecture is one of the masterpieces of Chinese ancient architectures. The Hui-style architecture was highly praised by architecture masters both at home and abroad because of its phenotypic features, such as black tiles, white wall, and horse-like wall; its decoration features, such as tile carving, wood carving, stone carving; and its living features, such as high house, deep well, large lobby. Since most of the Hui-style architectures were built long time ago, had not been repaired for many years, as well as influenced by different kinds of natural hazards, the Hui-style architectures were decayed, eaten by worms, or damaged by fire to different degree. Most of these architectures could not meet the living requirements nowadays with faint light, high humidity, poor sound insulation, badly cracks and corrosion of all kinds of wood components; and needed to be repaired and reinforced badly. Based on this situation, the author believes that the Hui-style architecture would be in its original appearance in front of the word in the near future if the scientific research and proper reinforcement measures were adopted for the reinforcement of the Hui-style architectures.

Empirical study on the correlation between measurement methods under diffuse and direct sound field conditions for determining sound absorption and airborne sound insulation properties of noise barriers

2021 ◽  
Vol 263 (3) ◽  
pp. 3350-3361
Author(s):  
Andreas Fuchs ◽  
Reinhard Wehr ◽  
Marco Conter
Keyword(s):  
Empirical Study ◽  
Sound Absorption ◽  
Sound Field ◽  
Research Programme ◽  
Measurement Methods ◽  
Field Conditions ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Noise Barriers ◽  
Airborne Sound

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) the database of the European noise barrier market developed during the QUIESST project was updated with newly acquired data. This database gives the opportunity for an empirical study on the correlation between the different measurement methods for the acoustic properties of noise barriers (according to the EN 1793 series) to further investigate the interrelationships between these methods by using single-number ratings and third-octave band data. First a correlation of the measurement methods for sound absorption under diffuse field conditions (EN 1793-1) and sound reflection under direct sound field conditions (EN 1793-5) is presented. Secondly, a correlation of the measurement methods for airborne sound insulation under diffuse field conditions (EN 1793-2) and airborne sound insulation under direct sound field conditions (EN 1793-6) is shown. While for airborne sound insulation a distinct correlation is found due to the wide data range, for sound absorption no robust correlation can be found.

Using different waste as resilient layers for impact sound insulation improvement: New alternative to commercial layers?

2021 ◽  
pp. 014362442110537
Author(s):  
Francisco José García-Cobos ◽  
Rubén Maderuelo-Sanz
Keyword(s):  
Residential Building ◽  
Acoustic Properties ◽  
Sustainable Construction ◽  
Sound Insulation ◽  
Building Sector ◽  
Impact Noise ◽  
Cigarette Butts ◽  
Industrial Materials ◽  
Recycled Waste

In the residential building sector, the use of floating floors is a common practice which increasingly used to reduce vibrations and impact noise. These are usually made from industrial materials, although the emerging concern for sustainable construction is leading to the use of other materials from recycled waste. This article studies the performance of rubber, cork, and cigarette butts as a floating floor. For this purpose, their acoustic properties (ISO 9052-1 and 12,354-2 standards) are analyzed and compared with those of some commercial materials. The results obtained indicated that the performance of these eco-materials is equal or superior to that of commercially available materials.

Acoustic manipulation of fractal metamaterials with negative properties and near-zero densities

2021 ◽  
Author(s):  
Guanghua Wu ◽  
Yibo Ke ◽  
Lin Zhang ◽  
Meng Tao
Keyword(s):  
High Potential ◽  
Experimental Results ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Sound Waves ◽  
Acoustic Metamaterials ◽  
Acoustic Device

Abstract Acoustic metamaterials have high potential in diverse applications, including acoustic cloaking, sound tunneling, wavefront reshaping, and sound insulation. In the present study, new metamaterials consisting of spatial coiled units are designed and fabricated to manipulate sound waves in the range 0-1600 Hz. The effective acoustic properties and band diagrams are studied. The simulation and experimental results demonstrate that the metamaterials provide an effective and feasible approach to design acoustic device such as sound cloaking and insulators.

Biodegradable Acoustic Proficiency in Sound Absorption Capacity After Water Treatment and Testing by Impendence Tube Method

2021 ◽  
pp. 75-90
Author(s):  
Tushar Kanta Mohapatra ◽  
Suchismita Satapathy ◽  
Isham Panigrahi ◽  
Debesh Mishra
Keyword(s):  
Composite Material ◽  
Sound Absorption ◽  
Research Work ◽  
Absorption Capacity ◽  
Sound Insulation ◽  
Biodegradable Materials ◽  
Acoustic Absorption ◽  
Fiber Reinforced Composite ◽  
New Class ◽  
Reinforced Composite

The present research investigation aims to fabricate a new class of fiber reinforced composite material by using biodegradable materials with epoxy as the strengthening agent. In order to explore the possibilities of using the new class of composite material in required application areas, the research work is carried out mainly in the field of the acoustic absorption properties of these bio fibers as an alternate building material. Also, the utilization of these materials as sound insulation will also provide a good solution to the waste management.

scholarly journals New Eco-Friendly Gypsum Materials for Civil Construction

2008 ◽  
Vol 587-588 ◽  
pp. 908-912 ◽  
Author(s):  
Rute Eires ◽  
Aires Camões ◽  
Saíd Jalali
Keyword(s):  
Paper Industry ◽  
Research Work ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Quercus Suber ◽  
Industrial Wastes ◽  
Acoustic Properties ◽  
Cellulose Fibres ◽  
Vibration Absorption ◽  
Cork Industry

The sustainable world’s economic growth and people’s life improvement greatly depend on the use of alternative products in the architecture and construction, such as industrial wastes conventionally called “green materials”. This paper concerns the main results of an experimental work carried out with the objective of developing new composite materials based on gypsum and incorporating waste material as granulated cork, a by-product of cork industry, and cellulose fibres, a waste of paper industry. Such materials are intended to be used as composite boards for non structural elements of construction, such as dry walls and ceiling. Cork (bark of the plant Quercus Suber L), a substance largely produced in Portugal, is a material whose characteristics are of considerable interest for the construction industry. It is regarded as a strategic material with enormous potential by its reduced density, elasticity, compressibility, waterproof, vibration absorption, thermal and acoustic insulation efficiency [1]. During the first stage of this research work the gypsum binder and its properties were studied. Then, composites with mineral additions (added to increase the waterproofing and resistance) were also developed and submitted to tests to determine their physical and mechanical properties. In last stage, reinforced composites using different industrial by-products have been developed. This paper will present the properties and the manufacture methods used to produce the above mentioned eco-friendly composites that can ease ways for using industrial wastes as new construction materials, with excellent inherent thermal and acoustic properties.

scholarly journals COMPARATIVE STUDY ON ANTI-INFLAMMATORY SYNERGISTIC ACTIVITY OF LORNOXICAM USING TURMERIC OIL IN TDDS

2018 ◽  
Vol 7 (4) ◽  
Author(s):  
Wasim Ahmed ◽  
Dipti Srivastava ◽  
Himani Awasthi ◽  
Bankim Chandra Nandy
Keyword(s):  
Moisture Absorption ◽  
Research Work ◽  
In Vitro Release ◽  
Penetration Enhancer ◽  
Moisture Loss ◽  
Synergistic Activity ◽  
Transdermal Patches ◽  
Rat Paw Edema ◽  
Anti Inflammatory

The present research work was an attempt to develop, evaluate matrix-type transdermal therapeutic system containing lornoxicam with hydrophilic polymer (HPMC E-5) and turmeric oil (leaf extract) by the solvent evaporation technique. The turmeric oil has been used for two reasons, one is to see whether it act as natural penetration enhancer (replacing chemical enhancers) and also to compare the anti-inflammatory synergism between the drug and the oil itself. The anti-inflammatory activity of turmeric oil has been well documented. The physicochemical compatibility of the drug, polymers and oil was studied by infrared spectroscopy. The results suggested no physicochemical incompatibility between them. Five  transdermal patch formulations (F1 to F5) consists of HPMC E5 (300 mg fixed) and turmeric oil in the concentrations 3%, 4%, 5%, 6% and 7% respectively were prepared. All formulations carried 10% w/v of Polyethylene glycol as plasticizer in dichloromethane and methanol (4:1) as solvent system. The prepared transdermal patches were evaluated for in vitro release, moisture absorption, moisture loss and mechanical properties. The diffusion studies were performed by using modified Franz diffusion cells. The formulation, F3 showed maximum release 97.56% as compared to patch without any penetration enhancer (58.83%).The synergistic activity has been determined by Carrageenan induced rat paw edema test and the results have confirmed the synergistic activity between the drug and turmeric oil. The developed transdermal patches may increase the efficacy of lornoxicam for the therapy of arthritis and other painful muscular conditions. Keywords: Transdermal system, HPMC, Turmeric oil, penetration enhancer, Synergistic activity.

scholarly journals Experimental Design of AL2O3/MWCNT/HDPE Hybrid Nanocomposites for Hip Joint Replacement

2020 ◽  
Author(s):  
Sameh Dabees ◽  
Bahaa Ahmed ◽  
Mohamed Sanad ◽  
Abou Bakr Elshalakny
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Moisture Absorption ◽  
Research Work ◽  
The Body ◽  
Lower Limbs ◽  
Hybrid Nanocomposites ◽  
Epithelial Cell Line ◽  
Gravimetric Analysis ◽  
Hip Joint Replacement

Abstract A hip fracture can be considered a major health issue facing the elderly fraction of humans. The loads exploited by the lower limbs are very acute and severe; in the femur, they can be several folds higher than the whole weight of the body. Mechanical properties like strength and hardness are challenging parameters which control the selection of the joint. In this research work, a modification has been performed by adding multi-layer carbon nanotubes to the High-density polyethylene thermoplastic polymer together with alumina. Prepared material well physiochemically characterized to check the morphology and the structure. Thermal gravimetric analysis (TGA) dedicates that the percentage of crystallization has been increased to 6% after adding Multi-wall carbon nanotubes (MWCNT)to the polymer. According to mechanical properties results, MWCNTs successfully increase in young’s module and hardness of the polymer. Optimization of the materials ration has been done and it has been found that hybrid composite with structure (2.4% AL 2 O 3 and 0.6% MWCNT) obtains high mechanical properties compared to other ratios with 3% MWCNTs and 5% MWCNTs. Also, moisture absorption decreased to 90% at with 5% MWCNT ratio. Experimental results of MTT assay of a normal human epithelial cell line (1- BJ1) over AL 2 O 3 /MWCNT@ HDPE showed a low value of cytotoxic activity, which proves that it is proper for medical use.AL 2 O 3 /MWCNT@HDPE composite showed promising results for further studies of artificial joints.

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