Abstract:Noise pollution is one of the harmful physical sources in the textile industry, which is among those industries that are faced with noise exposure problems. The results of environmental sound measurements at modern textile mills have shown that the sound pressure level varied from 95 to 130 dB, where the highest sound pressure level was at weaving machines. Textile insulation materials can be fitted in order to decrease sound pollution at a low cost. The objective of this work is to design a sound absorber tha… Show more
“…33,37,38 The meltblown nonwoven structure has a low areal density, fiber diameter, and average pore diameter resulting in a relatively high coefficient of sound absorption, particularly in the middle-frequency region. 13,14,27 In the case of the multi-layer structure, the STL mainly depends on the sound transmission of the layer directly facing the sound wave. When using a layer of the meltblown fabric over the rubber crumbs/fiber panel and due to the air gap between the two layers, the surface texture of the rubber crumbs is not smooth, therefore keeping air gaps increases the insolation of the panels.…”
Section: Resultsmentioning
confidence: 99%
“…STL can be calculated, ASTM E2611, using the following equation 13,14 where A is the incident and C is the transmitted sound components in decibels.Figure 3.Schematic drawing of the measurement setup. 27 …”
Section: Methodsmentioning
confidence: 99%
“…Panels sound insolation testing. The developed sound insulation measuring setup is based on the acoustical chamber method, 27 as illustrated schematically in Figure 3. Circular samples of 10 cm in diameter were used for the acoustical measurement.…”
Natural fibers and their waste are widely used all over the world, and their production has been increasing continuously. But, the rubber crumbs from used tire disposal are nonbiodegradable and present significant problems about their end-of-life given a critical environmental impact. These problems require recycling policies to provide the collection and recycling of used clothing, textile wastes, and rubber crumbs. In this work, the acoustic properties of insulator panels from the combination of textile fibers and rubber crumbs material were analyzed. Insulator panels demonstrated a good sound transmission loss (STL) characteristic, especially at high frequencies. The STL of the manufactured panels from a combination of fiber (cotton, wool, and Kapok) and rubber crumbs was investigated at the different sound frequencies. Results indicated that the fiber/rubber crumbs panel had a significant STL profile of 47 dB, 40 dB, and 35 dB, for Kapok, wool, and cotton, respectively. The addition of polylactic acid meltblown nonwoven fabric on the surface of the rubber crumbs side considerably increases the STL by 20%.
“…33,37,38 The meltblown nonwoven structure has a low areal density, fiber diameter, and average pore diameter resulting in a relatively high coefficient of sound absorption, particularly in the middle-frequency region. 13,14,27 In the case of the multi-layer structure, the STL mainly depends on the sound transmission of the layer directly facing the sound wave. When using a layer of the meltblown fabric over the rubber crumbs/fiber panel and due to the air gap between the two layers, the surface texture of the rubber crumbs is not smooth, therefore keeping air gaps increases the insolation of the panels.…”
Section: Resultsmentioning
confidence: 99%
“…STL can be calculated, ASTM E2611, using the following equation 13,14 where A is the incident and C is the transmitted sound components in decibels.Figure 3.Schematic drawing of the measurement setup. 27 …”
Section: Methodsmentioning
confidence: 99%
“…Panels sound insolation testing. The developed sound insulation measuring setup is based on the acoustical chamber method, 27 as illustrated schematically in Figure 3. Circular samples of 10 cm in diameter were used for the acoustical measurement.…”
Natural fibers and their waste are widely used all over the world, and their production has been increasing continuously. But, the rubber crumbs from used tire disposal are nonbiodegradable and present significant problems about their end-of-life given a critical environmental impact. These problems require recycling policies to provide the collection and recycling of used clothing, textile wastes, and rubber crumbs. In this work, the acoustic properties of insulator panels from the combination of textile fibers and rubber crumbs material were analyzed. Insulator panels demonstrated a good sound transmission loss (STL) characteristic, especially at high frequencies. The STL of the manufactured panels from a combination of fiber (cotton, wool, and Kapok) and rubber crumbs was investigated at the different sound frequencies. Results indicated that the fiber/rubber crumbs panel had a significant STL profile of 47 dB, 40 dB, and 35 dB, for Kapok, wool, and cotton, respectively. The addition of polylactic acid meltblown nonwoven fabric on the surface of the rubber crumbs side considerably increases the STL by 20%.
“…Nonwovens have been optimally used as thermal and acoustic insulation materials, 15,16 as their lightweight, void-filled structure gives them excellent insulating performance, enabling their use in various industrial fields such as automotive, 17 interior design, 18 transportation, and aeronautics, among others. 19,20 The main objective of this study was the development of new sustainable materials for thermal and acoustic insulation by using natural waste obtained from the processing of hemp fibers in the textile industry. By using wet-laid technology, nonwoven structures with a high content of hemp waste and different proportions of binder fibers were studied.…”
mentioning
confidence: 99%
“…Nonwovens have been optimally used as thermal and acoustic insulation materials, 15 , 16 as their lightweight, void-filled structure gives them excellent insulating performance, enabling their use in various industrial fields such as automotive, 17 interior design, 18 transportation, and aeronautics, among others. 19 , 20…”
This article reports on the revalorization of hemp waste from the textile industry, focusing on the development of new sustainable materials with high insulating properties. Wet-laid technology was used to manufacture nonwovens with different binding fibers, polylactic acid, and viscose fibers. The characterization of the acoustic insulating capacity was carried out using a Kundt tube, and the thermal insulating performance by measuring the heat transmission resistance ( R) and thermal conductivity ( λ). The results showed that the developed nonwovens have lower thermal conductivity values of about 0.027–0.034 W/(m K), were even lower than those of traditional thermal insulating materials, being the sample with 100 g/m2 of areal density and with a composition of 80% of hemp, 10% of polylactide and 10% of viscose the one with the lowest thermal conductivity (0.027 W/(mK). Their acoustic absorption capacity was around 0.76 at a frequency of 6 kHz, in samples containing high hemp waste (>80 wt%). However, the heterogeneous, discontinuous, and high void density structure that contributes to excellent insulating properties, lead to a decrease in their mechanical properties. This demonstrated that these materials are suitable for substituting traditional materials in insulating applications. Additionally, antifungal tests were carried out. However, hemp nonwovens proved to be inefficient against fungal proliferation.
Recycled fibers obtained from pre-textile waste present advantages and challenges in acoustic absorber design. This study examines the potential of incorporating textile waste into acoustic absorption systems, with a focus on pre-used waste, to increase the percentage of recycled fibers in the textile industry using the quantitative method Used to evaluate the efficiency of panels manufactured in different sound frequencies, from up to 2000 Hz, and, in some cases, up to 3000 Hz Observations indicate that surface cleaning products, pneumafil waste a twist, comb bat residue and waste grinders exhibit the highest sound absorption coefficients in and using waste samples In addition, a procedure has been developed to evaluate the sound absorption reduction coefficient, which exposes high correlations with values obtained by other methods Sound contour mapping further confirms the homogeneity of the sample and reveals the effectiveness of specific sound absorption systems, such as air condition station filters, spinning pneumafil waste, and weaving waste (samples 18, 20, 21, and 23). Nevertheless, the study of integration emphasizes the ability to reuse waste fibers for sound insulation that can absorb adequate sound, reduce reflected sound, and offer a promising solution for dealing with noise pollution. A thorough examination of sound contour maps across absorber surfaces is undertaken to account for the material structure of the absorber, ensuring an accurate representation of how sound is absorbed and distributed within the designated area.
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