Noise Absorbing materials using Agro Waste Products

Published on 19 Apr 2022. Written by Vinay Raj

Increase in population increases the number of vehicles and because of that both air and noise pollution are increased. Not only from the traffic but noise pollution is also produced from industries and also usage of many mechanical and electrical appliances has created this heavy dosage noise pollution.

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This noise produced from different kinds of machines can be reduced by controlling the noise generating factors or by using the noise proofing materials. This helps in reducing the side effects caused by noise pollution

Noise pollution causes many problems to humans and also to the structures, machines, etc… due to the energy of the acoustic wave the eardrum of humans gets damage, microcracks may occur on the machines and structures, and also very dangerous for people with heart-diseases.

Conventionally, this acoustic wave is controlled with the help of expensive materials such as polymer foams, glass wool and fabric filler these polymer fillers may also pose a threat to the environment. There are also limitations due to the usage of the glass as soundproofing materials as it is brittle and can break anytime without prior notification. So, as an alternative, we are using this agro-based waste such as rice husk and bamboo for absorbing the noise. Where rice husk is a waste product from the paddy fields and bamboo is abundantly available in the tropical areas of the climate.

Requirements:

Knowledge of Sound energy.

Rice straw.

Bamboo

Poly-propylene

Project Implementation:

1. Find the required area of soundproofing.
2. Find the required quantities of the risk husk and bamboo weights.
3. Iterate the ratios of quantities of the rice husk and bamboo until you get a good strength between them.
4. Polypropylene web is covered with the rice husk and bamboo at top and bottom, this layered material is pressed in the presence of heat and moisture is removed.
5. The extra voids (if present) are filled with PP. then this composite is cooled and at pressure is removed.
6. Conduct tests like Impedance tube test (acoustic coefficient), Flexure test, and moisture absorption test.  

Advantages:

• This composite is made of the agro-waste and is free of chemicals.
• This is eco-friendly in nature and also bio-degradable.
• Economical when compared with traditional methods.

Conclusion:

This project is to make the usage of the rice husk and bamboo as noise absorbing materials as they are available abundantly in the environment and cheaper than other traditional methods.

Kit required to develop Noise Absorbing materials using Agro Waste Products:

• NA

Technologies you will learn by working on Noise Absorbing materials using Agro Waste Products:

• Sound Pollution
• Agro Waste
• Absorption
• Reusing waste

Any Questions?