scholarly journals ESD Knitted Fabrics from Conductive Yarns Used as Protective Garment for Electronic Industry

2017 ◽  
Author(s):  
Gabriela Telipan ◽  
Beatrice Moasa ◽  
Elena Helerea ◽  
Eftalea Carpus ◽  
Razvan Scarlat ◽  
...  
Keyword(s):  
Electronic Industry ◽  
Knitted Fabrics ◽  
Conductive Yarns ◽  
Protective Garment

The impact of different proportions of knitting elements on the resistive properties of conductive fabrics

2018 ◽  
Vol 89 (5) ◽  
pp. 881-890 ◽  
Author(s):  
Su Liu ◽  
Yanping Liu ◽  
Li Li
Keyword(s):  
Contact Resistance ◽  
Reference Source ◽  
Wearable Electronics ◽  
Electronic Textiles ◽  
Knitted Fabrics ◽  
Conductive Yarns ◽  
Key Factor ◽  
Resistive Networks ◽  
The Impact ◽  
Resistive Property

Conductive yarn is the key factor in fabricating electronic textiles. Generally, three basic fabric production methods (knit, woven, and non-woven) combined with two finishing processes (embroidery and print) are adopted to embed conductive yarns into fabrics to achieve flexible electronic textiles. Conductive yarns with knit structure are the most flexible and effective form of electronic textiles. Electronic textiles present many advantages over conventional electronics. However, in the process of commercialization of conductive knitted fabrics, it is a great challenge to control the complicated resistive networks in conductive knitted fabrics for the purpose of cost saving and good esthetics. The resistive networks in conductive knitted fabrics contain length-related resistance and contact resistance. The physical forms of conductive yarns in different fabrication structures can be very different and, thus, the contact resistance varies greatly in different fabrics. So far, study of controlling the resistive property of conductive fabrics has not been conducted. Therefore, establishing a systematic method for the industry as a reference source to produce wearable electronics is in great demand. During the industrialization of conductive knitted fabrics, engineers can estimate the resistive property of the fabric in advance, which makes the production process more effective and cost efficient. What is more, the resistive distribution in the same area of knitted fabrics can be fully controlled.

Electromechanical analysis of length-related resistance and contact resistance of conductive knitted fabrics

2012 ◽  
Vol 82 (20) ◽  
pp. 2062-2070 ◽  
Author(s):  
Li Li ◽  
Song Liu ◽  
Feng Ding ◽  
Tao Hua ◽  
Wai Man Au ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Electrical Resistance ◽  
Tensile Force ◽  
Standard Errors ◽  
Knitted Fabrics ◽  
High Coefficient ◽  
Proposed Model ◽  
Conductive Yarns ◽  
Relationship Of ◽  
The Relationship

Conductive fabrics usually exhibit two types of electrical resistance: the length-related resistance and contact resistance. The length-related resistance increases with the applied extensile force, whereas the contact resistance decreases with the contact force. The resistance of conductive knitted fabrics could be modeled by the superposition of the length-related resistance and contact resistance. Three experiments were conducted to investigate the resistance of conductive yarns: two overlapped conduct yarns and conductive knitting stitches under unidirectional extensile forces, respectively; and the corresponding empirical equations were developed. The relationship of the resistance, tensile force, fabric length and width were established. The fitting curves with high coefficient of determinations (>0.94) and low standard errors (<0.18) given by the modeling equations were achieved. Therefore, the proposed model could be used to compute the resistance of the conductive knitting fabrics under unidirectional extension.

scholarly journals Electromagnetic Shielding Properties of Plain Knitted Fabrics Containing Conductive Yarns

2012 ◽  
Vol 7 (4) ◽  
pp. 155892501200700 ◽  
Author(s):  
Fatma Ceken ◽  
Gulsah Pamuk ◽  
Ozan Kayacan ◽  
Ahmet Ozkurt ◽  
Şebnem Seçkin Ugurlu
Keyword(s):  
Stainless Steel ◽  
Electromagnetic Shielding ◽  
Frequency Range ◽  
Horizontal Polarization ◽  
Knitted Fabrics ◽  
Polarization Measurements ◽  
Fabric Structure ◽  
Measurement Results ◽  
Conductive Yarns ◽  
Shielding Properties

In this study, stainless steel conductive yarns with 500 tex fineness and 14 Ω/m linear resistances were inserted into the reverse side of the knitted fabrics made from acrylic yarns. Six types of knitted fabrics with conductive yarns were produced on an E=7 gauge electronic flat bed knitting machine. Then the electromagnetic shielding efficiency (EMSE) of the sample fabrics were measured in the frequency range of 750 MHz – 3000 MHz. The EMSE variations of the sample fabrics having conductive yarns with respect to fabric structure and polarization type (vertical and horizontal) were also investigated. It was observed that the same samples showed different behaviors and have dissimilar EMSE values in different polarization conditions. When compared to horizontal polarization measurements, the vertical measurement results gave better EMSE values.

Measuring electromagnetic shielding efficiency of 1×1 plain knitted fabrics

2017 ◽  
Vol 29 (4) ◽  
pp. 525-538 ◽  
Author(s):  
Bahadur Goonesh Kumar ◽  
Satyadev Rosunee ◽  
Mark Bradshaw
Keyword(s):  
Electrical Resistance ◽  
Specific Weight ◽  
Knitted Fabrics ◽  
Faraday Cage ◽  
Content Type ◽  
Nano Coating ◽  
Determining Factors ◽  
Conductive Yarns ◽  
Cotton Yarns ◽  
Power Inputs

Purpose In this research project, electrical conductive yarns were knitted together with 100 per cent cotton yarns to create knitted fabrics that would be used as electromagnetic (EM) shielding materials. The paper aims to discuss these issues. Design/methodology/approach 1×1 plain fabrics knitted on double-bed hand knitting machines of five and seven gauges. Several strands of the cotton yarns were used together in order to knit samples with good handling properties. The electrical conductive yarn has six plies and each ply has 29 filaments with Naño-coating of silver and having an electrical resistance of 4 Ohms per 100 mm and a count of 96 Tex. The knitted fabrics have similar texture but vary in term of specific weight, fabric density, loop length, Tex, tightness factor, thickness and electrical conductivity. These variations affected the properties of the fabrics, determining factors of a good shielding or not. A special designed Faraday cage was built to measure the EMSE of each knitted fabrics. The EM waves were sent through the signal generator at different frequencies as from 400 to 1,100 MHz and with three different power inputs of 10, 20 and 30 dBm. EMSE measurements were also carried out after the knitted samples were rotated clockwise. Findings Good EMSE shielding results were achieved with the knitted samples, however in this study it was found that different knitted fabrics shielded better at specific frequencies and power inputs. Practical implications Knitted fabrics can be used to develop comfortable garments that can be used to shield EM waves and protect the wearer. Originality/value The choice of using the conductive yarns is exclusive. In addition the EMSE were measured with fabrics knitted in the same structure but on different knitting machine gauge. Three different power inputs were considered and EMSE measurements were taken using frequencies as from 400 to 1,100 MHz. A new method for measuring the electrical resistance on the knitted fabrics and the method used for measuring the EMSE for each knitted fabric were considered.

scholarly journals Structural Parameters Affecting Electrothermal Properties of Woolen Knitted Fabrics Integrated with Silver-Coated Yarns

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1709
Author(s):  
Kexia Sun ◽  
Su Liu ◽  
Hairu Long
Keyword(s):  
Thermal Properties ◽  
Structural Parameters ◽  
Knitted Fabrics ◽  
Conductive Fabric ◽  
Structural Differences ◽  
Conductive Yarns ◽  
Knitted Structure ◽  
Short Time ◽  
Structural Coefficient ◽  
Over Time

Recently, more and more researchers have focused on electrical textiles that can provide or convert energy to facilitate people’s lives. Knitting conductive yarns into ordinary fabrics is a common way for electrical textiles to transmit heat or electrical signals to humans. This paper is aimed at studying the resistance values and temperatures of electrothermal knitted conductive fabric (EKCF) subjected to certain voltages over time. Six types of EKCFs with structural differences were fabricated using a computerized flat knitting machine with intarsia technology. Uniform samples 10 × 10 cm in size were made from wool, as were two different specifications of silver-coated conductive yarns. The wool yarn and one silver-coated yarn were mixed to knit a resistance area 2 × 2 cm in size in the center of the EKCF to observe heating behaviors. The experiment results showed that when the EKCFs were subjected to certain voltages over time, the resistance values of the resistance area increased over a short time and then gradually decreased, and the temperature gradually increased in the first 1000 s and tended toward stability after a certain period of time. The structural coefficient κ between different knitted structures (which predicted the thermal properties of different EKCFs subjected to different voltages) was analyzed. These results are of great significance for predicting the electrothermal performance of EKCFs with different knitted structures. On the basis of these results, an optimized knitted structure was selected as the best EKCF for wearable textiles, and the findings contribute to the field of technological and intelligent electrothermal garments and related products.

Suitability of knitted fabrics as elongation sensors subject to structure, stitch dimension and elongation direction

2014 ◽  
Vol 84 (18) ◽  
pp. 2006-2012 ◽  
Author(s):  
A Ehrmann ◽  
F Heimlich ◽  
A Brücken ◽  
MO Weber ◽  
R Haug
Keyword(s):  
Strong Dependence ◽  
Pressure Sensors ◽  
Time Dependent ◽  
Electric Resistance ◽  
Knitted Fabrics ◽  
Textile Electrodes ◽  
Dependent Behavior ◽  
Textile Sensors ◽  
Conductive Yarns ◽  
Conductive Yarn

The area of smart textiles has recently attracted more and more attention. One of the challenges in this domain is the development of textile sensors, such as textile electrodes, pressure sensors, elongation sensors, etc., mostly containing conductive yarn and/or conductive coating. One possibility to build a textile elongation sensor which can, for example, be utilized as a breathing sensor in a smart shirt, is using knitted fabrics created from conductive yarns, which often show a strong dependence of the electric resistance on the elongation. Due to the typical wearing out of knitted fabrics, however, the time-dependent behavior of a stretched fabric must also be taken into account. The article thus shows the results of elongation-dependent and time-dependent resistance measurements on knitted fabrics, produced from different yarns in various structures and stitch dimensions, elongated in different orientations with respect to the course direction. The results of our study show that full cardigan with medium stitch size is better suited for use as an elongation sensor than double face fabrics or other stitch sizes. These findings are not influenced by the stainless steel fraction in the conduction yarn, while mixing this yarn with a non-conductive one causes undesired signal deviations.

scholarly journals Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Md. Reazuddin Repon ◽  
Daiva Mikučionienė ◽  
Ilze Baltina ◽  
Juris Blūms ◽  
Ginta Laureckiene
Keyword(s):  
Heat Generation ◽  
Linear Density ◽  
Knitted Fabrics ◽  
Electrically Conductive ◽  
Temperature Changes ◽  
Conductive Yarns

AbstractThis work deals with the electrically conductive textiles for heat generation in orthopedic compression supports. This study aimed to develop compression knitted structures with integrated electro-conductive yarns and investigate their heat generation characteristics and temperature changes during the time and under stretch which is required to generate compression. Combined half-Milano rib structured knitted fabrics were made by using silver (Ag) coated PA yarn of linear density of 66 tex and 235 tex, respectively. Six variants of specimens were developed by using different amount of electro-conductive yarns in a pattern repeat. It was found that stretch negatively influences temperature values as well as time in which the required temperature is reached. Therefore, the final wearing conditions have to be summed up during the designing of compression orthopedic heated supports.

Sign in / Sign up

Export Citation Format

Share Document