Effect of Textile-Substrate Pore Size on Electromagnetic Interference Shielding Performance of Conductive Nanocomposite Coated Fabrics

Textile-substrate electromagnetic interference (EMI) shielding materials show great promise for next-generation electronic communication technology challenges. However, new strategies based on structure optimization are desired for improving EMI shielding performance. Here, we demonstrate the controlling effect of fabric structure on the shielding effectiveness of the EMI fabrics. Plain fabrics with different fabric densities were weaved and used as the substrate to be layer-by-layer assembled by graphite oxide (GO) and polypyrrole (PPy). The conductive GO/PPy nanocomposite coating endows commercial cotton fabrics with an EMI shielding ability. In comparison, the EMI shielding effectiveness of the GO/PPy fabrics is depended on the fabric density, that is, the pore size. The EMI shielding effectiveness of the 100 × 100 picks/ 10cm coated fabric was 19.2 dB in 3.9−6.0 GHz frequency range, which is increased by about 71% through the control of the textile-substrate pore size. Interestingly, the EMI shielding effectiveness always peaks at the fabric density of 100 × 100 picks/ 10cm, different from the electrical conductivity. Moreover, the sueding treatment can further improve the EMI shielding effectiveness of the GO/PPy coated fabrics. It is because that the creation of plush increases the multi-reflection of electromagnetic waves in the fabric. This work presents the significance of fabric structure to EMI shielding performance, offering new opportunities for the development of high efficiency EMI shielding fabrics.

Investigation of Color Reproduction on Linen Fabrics when Printing with Mimaki TX400-1800D Inkjet with Pigment TP250 Dyes

The aim of this research is to investigate related effect of dyeability to linen textiles related to different printing parameters. The study investigated the change in color characteristics when printing on linen fabrics with an inkjet MIMAKI Tx400-1800D printer with pigmented TP 250 inks. The dependence of color reproduction on linen fabrics on the number of print head passes, number of ink layers to be coated, linen fabric density, and different types of linen fabric was investigated. All this affects the quality of print and its mechanical properties. The change in color characteristics on different types of linen fabrics was determined experimentally. We determine at which print settings the most accurate color reproduction can be achieved on different linen fabrics. The difference between the highest and the lowest possible number of head passages was investigated. The possibilities of reproducing different linen fabric colors were determined.

STUDI PENGUKURAN KONSTANTA DIELEKTRIK KAIN RAJUT PAKAN POLIESTER DAN KATUN MENGGUNAKAN METODE KAPASITANSI PERANGKAT KAPASITOR PLAT SEJAJAR

Pada penelitian ini telah dilakukan penentuan konstanta dielektrik material kain rajut pakan menggunakan metode kapasitansi perangkat kapasitor plat sejajar. Kain rajut pakan telah dibuat dengan menggunakan mesin rajut datar Stoll tipe CMS 530HP. Enam sampel kain rajut poliester dan katun telah dibuat pada mesin rajut terkomputerisasi dengan kerapatan yang berbeda-beda. Terdapat tiga jenis kerapatan kain rajut yang telah dibuat pada penelitian ini. Pengukuran kapasitansi terdiri dari perangkat mikrokontroler Arduino Uno dan susunan seri resistor-kapasitor (RC). Hasil penelitian menunjukan bahwa kain rajut katun NP10 memiliki konstanta dielektrik yang lebih besar dibandingkan dengan kain poliester pada struktur kain yang sama. Hasil menunjukan korelasi yang cukup baik antara hasil prediksi dan eksperimen pada pengukuran kapasitansi. Terdapat enam bahan dielektrik yang ditentukan dengan hasil dari yang terbesar sampai yang terkecil berturut-turut yaitu kain rajut katun NP 10 (22,8874 + 4,6388), kain rajut katun NP 11 (21,4717 + 3,8064), kain rajut katun NP 12 (17,8721 + 2,3233), kain rajut poliester NP 10 (9,7751 + 2,4922), kain rajut poliester NP 11 (8,8282 + 0,9360) dan kain rajut poliester NP 12 (8,4358 + 1,1849). Telah ditemukan hubungan antara parameter kerapatan kain kain rajut pakan terhadap nilai konstanta dielektrik terukur. Kata kunci—kain rajut pakan, poliester, katun, kerapatan kain, konstanta dielektrik, kapasitor plat-sejajar. ABSTRACT This paper describes the dielectric measurement of weft knitted fabric using parallel-plate capacitance method. The weft knitted fabric were fabricated using weft knit machine Stoll CMS 530HP. Six different samples of polyester and cotton knitted fabric were fabricated by computerized flat knitting machine. There are consist of three types of density which made on this study. The capacitance measurement were consist of Arduino Uno microcontroller and a series of resistor-capacitor (RC). The result of this research indicates that NP10 cotton knitted fabric has higher dielectric constant than the polyester knitted fabric, with similar structure respectively. There are six fabric dielectric materials that are determined with the results from the largest to the smallest in a row namely NP 10 cotton knitted fabric (22,8874 + 4,6388), NP 11 cotton knitted fabric (21,4717 + 3,8064), NP 12 cotton knitted fabric (17,8721 + 2,3233), NP 10 polyester knitted fabric (9,7751 + 2,4922), NP 11 polyester knitted fabric (8,8282 + 0,9360) and NP 12 polyester knitted fabric (8,4358 + 1,1849). It has been found the correlation between the fabric density and the permittivity of the weft knitted fabric. Keywords—weft knitted fabric, polyester, cotton, fabric density, dielectric constant, parallel-plate capacitor.

Effect of fabric parameters on fragrance retention

This study is to explore the effect of fabric parameters on fragrance retention, which was based on the olfactorymeasurement technology with the quantitative headspace method. The fragrance retention of different fabrics wasquantitatively evaluated by Electronic Nose (e-nose) at different time after volatilization. Quick-drying Tester was usedto test the fabric drying rate, which was related to fragrance retention. Besides, wicking property and porosity of fabrics,two factors of moisture transmission, were tested and calculated for analysis too. It was found that fabrics with the highercotton content had the better fragrance retention due to their hydrophilicity and water retention property of fibers. Plainfabric had the shorter fragrance retention than twill fabric since its lower porosity and the higher capillary pressure ledto the faster fragrance dissipation. As the fabric density increased or the yarn count decreased, the fragrance retentionincreased. Since their wicking properties decreased, the process of perfume diffusion would slow down. The data andmethods presented in this paper provide a basis for optimizing the parameters of fragrant fabric.

Effect of fabric parameters on fragrance retention

This study is to explore the effect of fabric parameters on fragrance retention, which was based on the olfactorymeasurement technology with the quantitative headspace method. The fragrance retention of different fabrics wasquantitatively evaluated by Electronic Nose (e-nose) at different time after volatilization. Quick-drying Tester was usedto test the fabric drying rate, which was related to fragrance retention. Besides, wicking property and porosity of fabrics,two factors of moisture transmission, were tested and calculated for analysis too. It was found that fabrics with the highercotton content had the better fragrance retention due to their hydrophilicity and water retention property of fibers. Plainfabric had the shorter fragrance retention than twill fabric since its lower porosity and the higher capillary pressure ledto the faster fragrance dissipation. As the fabric density increased or the yarn count decreased, the fragrance retentionincreased. Since their wicking properties decreased, the process of perfume diffusion would slow down. The data andmethods presented in this paper provide a basis for optimizing the parameters of fragrant fabric.

Thermophysiological comfort properties of woven fabrics produced from hybrid yarns containing copper wires

The aim of this study was to determine the thermophysiological comfort behavior of fabrics based on copper wire that can be used for electro-textile applications. For this purpose, hybrid folding yarns were produced by twisting cotton/polyester yarn with copper wire. These electrically conductive hybrid yarns were then used to produce upholstery fabrics with different weave types as plain, 2/1 twill and sateen weave in three different density levels as tight, medium and loose. Thermophysiological comfort properties such as air permeability, thermal and water vapor properties of the hybrid fabrics were measured. In addition, the heat transfer properties of the fabrics were investigated with thermal camera videos, and porosity values were determined from microscope images. In this way, the main thermophysiological comfort properties of the basic electro-textile structures were revealed. According to the results obtained, it was found that the use of conductive wire in the fabric structure did not negatively affect the thermophysiological comfort properties of the fabrics, and fabric density was a determining parameter in relation to the thermophysiological comfort properties of the fabrics. The obtained results of this study may be used to improve the design of electro-textile structures taking into account the thermophysiological comfort.

Evaluating the Air Permeability Properties of Summer Cooling Towels

Air permeability is one of the thermal comfort properties of clothing and fabrics. This study evaluated the air permeability properties of summer cooling towels of different brands available in the market, “Perfect Fitness”, “N-rit” and “Cooldyxm” and an anonymous ice towel. The air permeability function of the cooling towels was evaluated instrumentally. Other than the air permeability property, other fabric specification such as fiber composition, fabric type, fabric weight, fabric thickness, yarn linearity and fabric density were measured. Some specifications were found to have good statistical correlation with the air permeability. Based on the experimental results and statistical analysis, the sample of Perfect Fitness was found to have the poorest cooling effect, whereas N-rit, Cooldyxm and Ice Towel samples had comparable air permeability properties. The best performance of air permeability was seen in N-rit sample. The underlying reason could be ascribed to the fabric structure and thickness. This study can provide some information for choosing cooling towel for practical use.

A New Approach to Evaluate Fabric Hand Based on Three-Dimensional Drape Model

Fabric quality and performance is assessed subjectively by the customer using an important and complex phenomenon of fabric hand. Objectively, it is evaluated with complicated and expensive instruments, such as Kawabata Evaluation System for Fabrics (KES-F) and Fabric Assurance with Simple Testing (FAST). The present research explores a non-touch objective approach, i.e., three-dimensional (3D) drape model to estimate fabric hand. Fabric hand prediction was testified on different commercial fabrics spanning a wide range of areal weight, thickness, yarn count, and fabric density. Fabric objective ranks based on drape indicators using principal component analysis (PCA) were compared with subjective ranks of fabric hand. Additionally, fabric drape is evaluated three dimensionally and a new drape indicator drape height (DH) is proposed. The cosine similarity results have proved fabric drape as an objective alternate to fabric hand.