<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In this study, the insertion loss of devulcanized waste rubber baffles were evaluated. Acoustic baffles are suitable to reduce noise from the devices or machines by interfering with their emitting sound waves. Knowledge of the acoustic properties of the material used is of significant importance in ensuring the effectiveness of the acoustic properties of the baffle. Basic properties include airborne sound insulation, which is usually determined during laboratory tests. Baffles consists of sound absorbing and sound insulating materials. In this study, plasterboards were used as sound insulating material and devulcanized waste rubber as sound absorbing material. During the devulcanization process, porous granules are obtained, which can be used as an acoustic material. In this study, two types of rubber granules were devulcanized by grinding method and one other type was chemically devulcanized. Three types of rubber granules were mixed together in increasing 25 % proportion steps and glued with patented polyurethane glue. A total of 15 different composition devulcanized waste rubber granule boards were made. Rubber boards were attached together with the plasterboards. Insertion loss of the different composite baffles was measured in semi-anechoic chamber in a purposefully designed stand in 1/3rd octave bands. The results showed that the insertion loss of the baffles was mostly dependent on the rubber granule board density. When the density of the rubber board increased, the insertion loss also increased. The 5–6 dB insertion loss difference was measured between the most and least dense rubber granule board baffles.</p>
</abstract>

In this study, the insertion loss of devulcanized waste rubber baffles were evaluated. Acoustic baffles are suitable to reduce noise from the devices or machines by interfering with their emitting sound waves. Knowledge of the acoustic properties of the material used is of significant importance in ensuring the effectiveness of the acoustic properties of the baffle. Basic properties include airborne sound insulation, which is usually determined during laboratory tests. Baffles consists of sound absorbing and sound insulating materials. In this study, plasterboards were used as sound insulating material and devulcanized waste rubber as sound absorbing material. During the devulcanization process, porous granules are obtained, which can be used as an acoustic material. In this study, two types of rubber granules were devulcanized by grinding method and one other type was chemically devulcanized. Three types of rubber granules were mixed together in increasing 25 % proportion steps and glued with patented polyurethane glue. A total of 15 different composition devulcanized waste rubber granule boards were made. Rubber boards were attached together with the plasterboards. Insertion loss of the different composite baffles was measured in semi-anechoic chamber in a purposefully designed stand in 1/3rd octave bands. The results showed that the insertion loss of the baffles was mostly dependent on the rubber granule board density. When the density of the rubber board increased, the insertion loss also increased. The 5–6 dB insertion loss difference was measured between the most and least dense rubber granule board baffles.

Research of Insertion Loss of Multilayered Construction with Devulcanized Waste Rubber

Department of Environmental Protection and Water Engineering

Environmental and Climate Technologies

This work is licensed under the Creative Commons Attribution 4.0 International License.

In this study, the insertion loss of devulcanized waste rubber baffles were evaluated. Acoustic baffles are suitable to reduce noise from the devices or...

Research of Insertion Loss of Multilayered Construction with Devulcanized Waste Rubber

Published Online: Mar 09, 2024

Page range: 120 - 134

Received: Apr 13, 2023

Accepted: Nov 22, 2023

DOI: https://doi.org/10.2478/rtuect-2024-0011

Keywords
Baffle, devulcanization, insertion loss, rubber, sound reduction

© 2024 Tomas Vilniškis et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Research of Insertion Loss of Multilayered Construction with Devulcanized Waste Rubber

Published Online: Mar 09, 2024

Page range: 120 - 134

Received: Apr 13, 2023

Accepted: Nov 22, 2023

DOI: https://doi.org/10.2478/rtuect-2024-0011

KeywordsBaffle, devulcanization, insertion loss, rubber, sound reduction

© 2024 Tomas Vilniškis et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Baffle, devulcanization, insertion loss, rubber, sound reduction