Sustainable Sound Absorber from Nonwoven Fabric of Natural Biduri Fibers (Calotropis gigantea) with Polyester Binder

ABSTRACT

In recent years, the research on sound-absorbing material has been directed to sustainable materials such as kenaf fiber and coconut coir fiber. Herein, this study offers the acoustic absorption performance of a novel natural fiber that is biduri fiber (Calotropis gigantea). Biduri fiber is a cellulose fiber that has a low density and a hollow structure along the fiber; hence, it has potential for sound absorption. Biduri fibers were thermally bonded with polyester fibers into nonwoven fabric. The sound absorption coefficient was measured using an impedance tube system, according to International Organization for Standardization (ISO) 10534-2:1998. The nonwoven fabric effectively absorbed high-frequency sound (2000–5000 Hz). The absorption coefficient reached 0.95 at 1600 Hz for nonwoven fabric with 95 wt.% of biduri fibers, a density of 25.9 kg m⁻³, and a thickness of 15–21 mm, which was better than glass wool and several natural fibers. Nonwoven fabrics with a thickness of 15–21 mm and ≥80 wt.% of biduri fibers met Indonesian National Standard 8443:2017 for high- and low-frequency sound silencers. Using the approximate relationship of the absorption coefficient between normal and random incidence sound, it was found that those nonwoven fabrics were categorized as class B sound-absorbing material according to ISO 11654:1997.

摘要

近年来, 吸声材料的研究已转向可持续材料, 如红麻纤维, 椰壳纤维等. 在此, 本研究提供了一种新型天然纤维的吸声性能, 即biduri纤维 (Calotris gigantea) . Biduri纤维是一种密度低且沿纤维呈中空结构的纤维素纤维, 因此具有吸声潜力. Biduri纤维与聚酯纤维热粘合成非织造布. 根据ISO 10534-2:1998, 使用阻抗管系统测量吸声系数. 非织造布有效吸收高频声音 (2000-5000赫兹) . 对于含有95%重量百分比biduri纤维, 密度为25.9kg m-3, 厚度为15-21mm的非织造布, 在1600 Hz下的吸收系数达到0.95, 优于玻璃棉和几种天然纤维. 厚度为15-21毫米的非织造布和≥80%的biduri纤维符合印度尼西亚标准SNI 8443:2017中关于高频和低频消声器的规定. 利用正入射声和随机入射声之间吸收系数的近似关系, 发现根据ISO 11654:1997, 这些非织造布属于B类吸声材料.

KEYWORDS:

• Sound absorbing
• milkweed fiber
• Calotropis gigantea
• nonwoven fabric
• natural fiber
• cellulose fiber

关键词:

• 吸音
• 马利筋纤维
• 巨大钙营养体
• 无纺布
• 天然纤维
• 纤维素纤维

Acknowledgments

The authors are thankful for the funding support from Bina Nusantara University under scheme of BINUS Research untuk Nusantara with the code of BRUN03.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Bina Nusantara University [BRUN03].