Abstract
In order to find a reasonable way to use the waste corn husk, waste degummed corn husk fibers were used as reinforcing material in one type of composite material. And polylactic acid particles were used as matrix material. The composite materials were prepared by mixing and hot-pressing process, and they were processed into the micro-slit panel. Then, the multi-layer structural sound absorption composite materials were prepared sequentially by micro-slit panel, air cavity, and flax felt. Finally, the sound absorption properties of the multi-layer structural composite materials were studied by changing flax felt thickness, air cavity depth, slit rate, and thickness of micro-slit panel. As the flax felt thickness varied from 0 to 10 mm in 5 mm increments, the peak of sound absorption coefficient shifted to low frequency. The sound absorption coefficient in the low frequency was improved with the air cavity depth varied from 0 to 10 mm in 5 mm increments. With the slit rate increased from 3% to 7% in 2% increments, the peak of sound absorption coefficient shifted to high frequency. With the thickness of micro-slit panel increased from 2 to 6 mm in 2 mm increments, the sound absorption bandwidth was broaden, and the peak of sound absorption coefficient was increased and shifted to low frequency. Results showed that the highest sound absorption coefficient of the multi-layer structural composite materials was about 1 under the optimal process conditions.
Highlights
With the development of industrialization and modernization, noise pollution is becoming more and more serious
Yang et al.[19,20] had studied the structural parameters of multi-layer nonwovens that affect sound absorption properties, and the results showed that with thickness of nonwovens, the increase in the thickness of air cavity and layers of nonwovens can improve the sound absorption coefficient in the low-frequency range
Waste corn husk fibers were used as reinforcement material, and PLAs were used as matrix material
Summary
With the development of industrialization and modernization, noise pollution is becoming more and more serious. Noise is defined as unwanted sound.[1] The main sources of noise in life are traffic and industrial machines.[2,3,4] In a sustaining noise environment, we may have hearing impairments and effect our life.[5] it is important to research on sound absorption materials. Corn is one of the most widely distributed crops in the world. Corn is an example of major crops that result in generation of huge amounts of waste from its cultivation and processing.[6] The sound absorption coefficient of the waste corn husk fibers was tested,[7,8] so the waste corn husk fibers could be made into sound-absorbing material
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
