Electromagnetic shielding effectiveness of needle-punched composite nonwoven fabrics with stainless steel fibres

IF 1 4区工程技术 Q3 MATERIALS SCIENCE, TEXTILES

Industria Textila Pub Date : 2024-02-27 DOI:10.35530/it.075.01.202346

Ali Beyit, Mustafa Sabri Özen, E. Sancak

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引用次数: 0

Abstract

In the study, electromagnetic shielding efficiency (EMSE) absorption and reflectivity properties of fabric produced from staple stainless-steel fibres and recycled staple polyester fibres by carding and needling technologies were investigated. The bi-component core/sheath polyester fibres at a fixed ratio of 20% in producing all nonwoven fabrics were used. The staple stainless-steel fibres and recycled staple polyester fibres were blended at 13 different ratios such as 1%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%, 25%, 27.5%, 30%. The fibre webs were formed at wool type carding machine and then the folded webs were bonded mechanically with needle punching machines. Half of the produced nonwoven composite fabrics were bonded by thermal bonding technology with oven and calender machines. As the conductive fibres were costly, the study aimed to obtain optimum shielding effectiveness with the usage of minimum conductive fibres. Electromagnetic shielding properties, absorption and reflection characteristics of needle-punched nonwoven fabrics with calendered or un-calendered were performed by coaxial transmission line method according to ASTM-D4935-10 in the frequency range of 15 MHz to 3000 MHz. It is a known fact that electromagnetic shielding effectiveness increases with the increase in the amount of conductive fibre. It was found that nonwoven fabric produced with a usage of 17.5% stainless steel fibre has at least 90% electromagnetic shielding percentage in general use with 15 dB at a frequency of 1800 MHz. Increased stainless steel fibre content in nonwoven fabrics resulted in decreased nonwoven fabric thickness and tensile strength. Such a nonwoven composite material with electromagnetic shielding property could be used for construction and building applications.

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含有不锈钢纤维的针刺复合无纺布的电磁屏蔽效果

该研究采用梳理和针刺技术，研究了用短切不锈钢纤维和回收短切聚酯纤维生产的织物的电磁屏蔽效率（EMSE）吸收和反射特性。不锈钢短纤维和回收的聚酯短纤维以 13 种不同的比例混合，如 1%、2.5%、5%、7.5%、10%、12.5%、15%、17.5%、20%、22.5%、25%、27.5% 和 30%。纤维网在羊毛型梳理机上成型，然后用针刺机将折叠的纤维网进行机械粘合。一半的无纺复合织物采用热粘合技术，用烘箱和压光机粘合。由于导电纤维价格昂贵，研究旨在使用最少的导电纤维获得最佳的屏蔽效果。根据 ASTM-D4935-10 标准，在 15 MHz 至 3000 MHz 的频率范围内，采用同轴传输线法测试了压光或未压光针刺无纺布的电磁屏蔽性能、吸收和反射特性。众所周知，电磁屏蔽效果随着导电纤维数量的增加而提高。研究发现，使用 17.5% 的不锈钢纤维生产的无纺布在 1800 MHz 频率下的电磁屏蔽率至少达到 90%（15 dB）。无纺布中不锈钢纤维含量的增加会导致无纺布厚度和抗拉强度的降低。这种具有电磁屏蔽性能的无纺布复合材料可用于建筑和楼宇应用。

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来源期刊

Industria Textila 工程技术-材料科学：纺织

CiteScore

1.80

自引率

14.30%

发文量

审稿时长

3.5 months

期刊介绍： Industria Textila journal is addressed to university and research specialists, to companies active in the textiles and clothing sector and to the related sectors users of textile products with a technical purpose.