scholarly journals Hybrid knitted fabric for electromagnetic radiation shielding

2020 ◽  
Vol 15 ◽  
pp. 155892502092539
Author(s):  
Veronika Tunakova ◽  
Maros Tunak ◽  
Vladimir Bajzik ◽  
Larysa Ocheretna ◽  
Svitlana Arabuli ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Circulatory System ◽  
Endocrine System ◽  
Electromagnetic Shielding ◽  
Radiation Shielding ◽  
Raw Material ◽  
Shielding Effectiveness ◽  
New Production ◽  
Protective Material ◽  
Knitted Structure

Today we can’t imagine our life without electricity and technology, transport and television. In the information age, computers, the Internet, cell phones, and smartphones are helpers for everyday needs. However, our environment and comfortable living in it can be detrimental to our health. It is hard to realize the fact that such a global technical breakthrough has hit human health. Exposure to electromagnetic radiation could lead to changes in the structure of nerve cells and blood formulas, deformation of the circulatory system, pathology of the endocrine system, decreased immunity, and so on. Nowadays the development of innovative textiles with electromagnetic radiation shielding is a relevant topic that promotes the creation of a flexible protective screen for the human being and various electronic devices. Textiles themselves do not protect against electromagnetic radiation; however, the textiles can be successfully converted into protective material after changing the raw material composition, creating a new production process, or adapting technologies that can make them electrically conductive. Basic methods of textile producing such as weaving, knitting, non-weaving, or their combination can be used to make electromagnetic shielding fabric. In this study, the knitting on 8-gauge flat-bed machine has been chosen as main technology. The metal wire (stainless steel: 0.12 mm) is used separately or together with 10 × 2 tex cotton yarn. Two sets of samples with different interloopings are produced which differ by steel percentages and positioning in the structures. Electromagnetic shielding effectiveness of textile samples (dB) was measured according to ASTM 4935-10 on frequency range 30 MHz–1.5 GHz. It is concluded that the positioning of the metal components in the knitted structure is the main factor determining the shielding ability. The half Milano rib knitted structure demonstrates the highest shielding efficiency.

Fashion clothing with electromagnetic radiation protection: aesthetic properties and performance

2020 ◽  
Vol 90 (21-22) ◽  
pp. 2504-2521
Author(s):  
Veronika Tunakova ◽  
Maros Tunak ◽  
Pavla Tesinova ◽  
Marie Seidlova ◽  
Jiri Prochazka
Keyword(s):  
Electromagnetic Radiation ◽  
Radiation Protection ◽  
Electromagnetic Shielding ◽  
Woven Fabric ◽  
Digital Printing ◽  
Color Fastness ◽  
Shielding Effectiveness ◽  
Metal Fiber ◽  
Electrically Conductive ◽  
Negative Effect

At present, much attention is focused on developing clothing fabrics with advanced functionality without compromising their visual, mechanical, or comfort properties. A fabric’s ability to prevent the penetration of electromagnetic radiation is an interesting added feature. In the published literature, there are many references describing the development and investigation of electromagnetic shielding textile structures using different electrically conductive additives. However, little attention has been given to the aesthetic and comfort properties of these special fabrics. Moreover, the availability of everyday fashion containing electromagnetic radiation protection is very limited. For this study, woven fabric made from a mixture of traditional fibers and extremely thin discrete stainless steel fibers developed in the authors’ previous research was used as a substrate. The fabric was digitally printed to provide an interesting design effect suitable for use in clothing and for making clothes for everyday wear. The main objective of this work is to determine whether digital printing is a suitable tool for changing the color and pattern of this metal fiber-containing fabric. The individual goals are (a) to examine the fabric’s color fastness to washing and (b) to investigate whether the surface modification of the fabric adversely affects its functionality. Results show that it is possible to change the color and pattern of metal fiber-containing fabric by digital printing easily, whereas the associated decrease of porosity causes an increase of this special fabric functionality. The electromagnetic shielding effectiveness of the fabric after printing is around 33 dB for frequency 1.5 GHz. However, washing has a negative effect, causing both the electromagnetic shielding ability decrease (to 27 dB for frequency 1.5 GHz after 20 washing and drying cycles) and color fading (the color fastness grade is around 1–2 after 20 washing and drying cycles). Furthermore, the basic transport properties of printed electrically conductive fabric are compared with those of fabric made from traditional material and positive results are found. The incidence of pilling after washing is also evaluated, whereas the first pills are observed after the eighth washing and drying cycle. Finally, clothing prototypes that could be prepared from printed fabric are presented.

Production of Electromagnetic Shielding Boards Using Paper/Plastic/Aluminum Packaging Waste & Copper Fibers

2012 ◽  
Vol 200 ◽  
pp. 254-258 ◽  
Author(s):  
Chang Yan Xu ◽  
Jie Liu ◽  
Xu Dong Zhu
Keyword(s):  
Fiber Length ◽  
Volume Resistivity ◽  
Barrier Properties ◽  
Electromagnetic Shielding ◽  
Fiber Content ◽  
Raw Material ◽  
Shielding Effectiveness ◽  
The Public ◽  
Packaging Waste ◽  
5 Ghz

Paper/plastic/aluminum (PPA) multilayer composite is one of the most favorable packaging material for milk and yoghourt because of its excellent material properties, especially the unbreakability, machinability and barrier properties towards moisture, oxygen and light. Ecological demands on littering and on carbon footprint gave pressure on the public community. Together with the increasing amount of PPA packaging containers all over the world, the recollection and recycling of PPA packages was steadily increasing. In this paper, an electromagnetic shielding board was produced with Tetra Pak waste and copper fibers. Electromagnetic shielding effectiveness (SE) and volume resistivity (VR) were investigated. It was found that SE increased with the increased copper fiber content but declined with the increases copper fiber length. However, VR showed an opposite tendency. In the condition of 100 g/m2 copper fiber content and 3-4 mm fiber length, the board showed good shielding performance, e.g., in the range of 9 KHz 5 GHz frequency, the average SE was up to 24.11 dB, and in the range of 600 MHz 1000 MHz frequency, the maximum SE came up to 58.91 dB. Based on the findings of this study, a conclusion could be made that manufacturing electromagnetic shielding boards using PPA packaging waste should be regarded as a step in the prevention of the environmental pollution and as a method of achieving economical worth from these items, and this type board could be considered as an alternative raw material with accepted properties to be used in packaging, interior finish, furniture, and other applications.

A new study on the influencing factors and mechanism of shielding effectiveness of woven fabrics containing stainless steel fibers

2019 ◽  
Vol 50 (6) ◽  
pp. 830-846
Author(s):  
Yalan Yang ◽  
Jianping Wang ◽  
Zhe Liu ◽  
Zhujun Wang
Keyword(s):  
Stainless Steel ◽  
Electromagnetic Wave ◽  
Electromagnetic Radiation ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Living Environment ◽  
Steel Fibers ◽  
Wave Frequency ◽  
Shielding Effectiveness ◽  
Electromagnetic Shielding Effectiveness

Electromagnetic radiation is becoming increasingly serious around our living environment, which seriously endangers people's health and interferes with the operation of electronic equipment. The research and development of anti-electromagnetic radiation fabric have drawn more and more attention. However, the influencing rules and mechanisms of conductive fiber content, fabric tightness, warp–weft density, conductive yarn arrangement, weave type, and electromagnetic wave frequency on fabric electromagnetic shielding effectiveness have not been clarified. Therefore, in this study, a series of fabrics containing stainless steel fibers were produced. Meanwhile, the influencing rules of various factors on electromagnetic shielding effectiveness and the quantitative relationship between some factors and electromagnetic shielding effectiveness were discussed. The results showed that all factors had different degrees of influence on electromagnetic shielding effectiveness, and the relationship between electromagnetic shielding effectiveness and electromagnetic wave frequency could be approximately expressed as: [Formula: see text]. At the same time, the influencing mechanisms of various factors on electromagnetic shielding effectiveness were analyzed in combination with fabric microstructure and macrostructure, the intrinsic parameters of the fabric and the electromagnetic shielding effectiveness mechanism. The results are expected to provide a reference for the establishment of electromagnetic shielding fabric model and enterprise production.

scholarly journals Improved microwave absorption in lightweight resin-based carbon foam by decorating with magnetic and dielectric nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23476-23484 ◽  
Author(s):  
R. Kumar ◽  
A. P. Singh ◽  
M. Chand ◽  
R. P. Pant ◽  
R. K. Kotnala ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Microwave Absorption ◽  
Zno Nanoparticles ◽  
Carbon Foam ◽  
Radiation Shielding ◽  
Shielding Effectiveness ◽  
Absorption Component

Carbon foam (CFoam) decorated with Fe3O4–ZnO nanoparticles significantly improved electromagnetic radiation shielding effectiveness which is mainly dominated by absorption component.

scholarly journals Інтер'єрний текстиль з екрануючими властивостями до дії електромагнітного випромінювання

2020 ◽  
pp. 145-155
Author(s):  
С. І. Арабулі ◽  
О. П. Кизимчук ◽  
А. Т. Арабулі ◽  
В. І. Власенко ◽  
В. Байзік ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Materials Science ◽  
Experimental Studies ◽  
Woven Fabrics ◽  
Radiation Shielding ◽  
Practical Significance ◽  
Shielding Effectiveness ◽  
Textile Materials ◽  
Textile Fabrics ◽  
Interior Textile

The purpose. An investigation of the shielding effectiveness against electromagnetic radiation (EMR) by woven fabrics that are presented on the Ukrainian interior textile market. Methodology. Theoretical and experimental research is based on the general principles of textile materials science. The shielding effectiveness to EMR of textile fabrics was tested and measured using EM-2107A (Electro Metrics) in accordance with ASTM 4935-10 in the frequency range 30 MHz – 1.5 GHz. Results. Flexible screens based on textile materials are widely used for EMR shielding. The shielding effectiveness against EMR by textile materials can be improved with fabric modifying by metal fibers/threads, metal particles or conductive polymers at various stages of textile production. It possible to substantiate the expediency of using metal-containing textile materials as interior textiles on the result of carried out analysis of the modern assortment of interior textiles and the experimental studies. Studies results have shown that the proposed fabrics have a high shielding ability by the classification "professional use" according to FTTS-FA-003 Specified Requirements of Electromagnetic Shielding Textiles, the shielding efficiency of which is within 30 ÷ 60 dB. Scientific novelty. The expediency of using modern metal-containing textile materials as interior textiles for windows decoration has been substantiated. The studied textile materials make it possible to clarify a new promising segment of the interior textile market - windows decoration. The main goal of such textile - the decoration of the residential and administrative buildings is expanded and supplemented by the function of electromagnetic radiation shielding. Practical significance. The complex of scientific research on the shielding effectiveness against EMR allowed offering a new range of interior textile materials for window decoration.

scholarly journals A Comparative Application for Evaluating Composite Fabrics Used in Electromagnetic Shielding

2017 ◽  
Vol 7 (6) ◽  
pp. 2156-2159
Author(s):  
F. G. Kizilcay Abdulla ◽  
R. Abdulla
Keyword(s):  
Electromagnetic Radiation ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Absorption Coefficients ◽  
Popular Method ◽  
Stitch Length ◽  
Shielding Properties ◽  
Transmission And Absorption ◽  
Composite Fabrics ◽  
User Friendly

Composite fabrics containing metal filaments are used widely for preventing electromagnetic radiation. Many experiments involving them are carried out continuously. Results are simulated in order to analyze their performance. Coding in Matlab is a popular method to compare the electromagnetic shielding properties of composite fabrics but for different options Matlab codes must be edited each time. Scientists who are not experts in coding have difficulties on editing such codes. To overcome this, an application written in C# in Visual Studio with .Net platform was developed. This application is integrated with Bunifu, which allows the application to be well designed. The proposed interface is user friendly and lets the user choose the available fabric with its stitch length from panel section. By setting options one can get the electromagnetic parameters such as scattering (S) parameters, reflection, transmission and absorption coefficients and total shielding effectiveness (SE) values with one click. As the application is integrated with Matlab codes, output is given as a Matlab graph with desired options. In this way the distinctions between the chosen fabrics can be analyzed easily.

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