Three-dimensional weft-knitted textile fabrics-based capacitors

Matsouka, Dimitroula; Vassiliadis, Savvas; Mitilineos, Stylianos; Σταθόπουλος, Νικόλαος; Σιώρης, Ηλίας

doi:10.1080/00405000.2017.1330174

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…As one type of the 3D textile structures, the 3D spacer knitted fabric has been widely used in engineering field owing to its smooth and efficient processing in warp and weft knitting [16]. Knitted spacer fabrics can be produced using a flat knitting machine, two needle bar raschel knitting machine (warp-knitted spacer fabric), and also a circular double jersey machine (weft-knitted spacer fabrics) [22][23][24]. Threelayer weft-knitted spacer fabrics have a structure that consists of two separate knitted layers joined together by a connective yarn.…”

Section: Introductionmentioning

confidence: 99%

“…Thanks to their characteristics, spacer fabrics show different properties which cannot be met by the conventional textiles and have not been possible to achieve by using other technologies. These fabrics continue to find new and novel product applications, using them in various fields, such as protective clothing, transportation, geo-textiles, buildings, packing materials, military equipment, medicine and sports and so on [21,22,[24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Development and evaluation of 3D knitted fabrics to protect against mechanical risk

Krauledaitė

Ancutienė

Urbelis³

et al. 2018

Journal of Industrial Textiles

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In this research, eight different 3D weft-knitted fabrics were developed and evaluated. 3D fabrics have been knitted on circular weft-knitting machines with two different gauges: 20E gauge and 28E gauge. Three different raw materials were used for the fabric’s production: high molecular mass polyethylene (HPPE) yarn and 0.05 mm diameter steel wire in the outer layers (for the front and reverse) and polyamide yarn in the binding layer. The experiments were conducted on the developed 3D knitted fabrics to determine the fabric’s resistance to mechanical risks such as circular blade cut, puncture, abrasion, and also to evaluate the comfort parameter, such as air permeability. It was defined that 3D weft-knitted fabrics best results on tests: circular blade cut, puncture and abrasion resistant were achieved using HPPE yarn twisted with steel wire, higher mass per unit area with more significant amount of steel wire. According to the standard EN 388:2003, three samples of developed 3D weft-knitted fabrics had the highest 5th blade cut and the highest (4th) abrasion resistance level. All of them had the highest (4th) level of puncture resistance. 3D fabrics knitted on a circular weft-knitting machine of gauge 28E ensured 1.3–2.1 times greater blade cut and 4.9–12.1 times greater abrasion resistance result, than fabrics knitted on gauge 20E, due to a higher stitch density, higher mass per unit area, density and fabric’s thickness. But on the other hand, these parameters lowered air permeability by 20.2–43.0%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and evaluation of 3D knitted fabrics to protect against mechanical risk

Krauledaitė

Ancutienė

Urbelis³

et al. 2018

Journal of Industrial Textiles

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“…The dielectric constant, ε r , of the material is a measure of the extent to which it can concentrate electrostatic lines of flux [45][46][47]. It is a number relating the ability of the material to carry alternating current to the ability of vacuum to carry alternating current [48].…”

Section: Resultsmentioning

confidence: 99%

Dielectric Behavior of SBS/Polyaniline Thermally Processable Blends

Souza¹,

Soares²,

Silveira³

et al. 2018

ChChT

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Styrene-butadiene-styrene triblock copolymer (SBS) blends were prepared using different weight ratios of conducting polyaniline (PANI). Several electrical properties such as volume resistivity, dielectric constant, dissipation factor and alternating current conductivity of the blends were studied pointing to understand the influence of different parameters like PANI concentration, frequency, and temperature on these properties. The prepared materials present a slight reduction in volume resistivity as a function of temperature, being useful in conditions where the temperature control is hard. More than this, dielectric constant tests allowed inferring that among tested samples, the one filled with 45 wt % of PANI is potentially able to be used in the electromagnetic dissipation field. Finally, the alternating current tests allowed to prove that the electrical conduction of the blend is mainly dominated by ionic transportation. Therefore, prepared materials can be considered as a strategic, low-cost, environmentally friendly material which can be used in various border fields.

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“…Otherwise, the outputs are easily influenced by parasitic capacitance. The spacer layer, by PET yarns of the spacer fabric, will improve the elasticity of the electrodes, thereby increasing the sensitivity of the sensor for flexible applications in wearable research [26,43,44]. The capacitance at the pressing point (C) can be calculated by Equation 1, where A represents electrode area, d represents dielectric thickness, ε 0 represents a constant for the dielectric permittivity of vacuum, and ε r represents the permittivity of a dielectric.…”

Section: The Capacitive Pressure Sensor Layermentioning

confidence: 99%

Simultaneous Sensing of Touch and Pressure by Using Highly Elastic e-Fabrics

Kim

2020

Applied Sciences

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In recent years, electronic skins have been widely studied for human monitoring systems. This research field needs multi-sensing points for large deformation, strong recovery, and mass production methods. Toward these aims, the fabrication of e-fabric skins made from a capacitive touch sensing layer and a capacitive pressure sensing layer is presented in the paper. Due to the high elasticity of the dielectric layer of the spacer fabric, this structure exhibits a very fast recovery time (6 ms), low hysteresis (<5%), and high cycling stability (>20,000 times). Besides, the stacking structure of the electrode layers ( single-wall carbon nanotube/silver paste) is due to good durability even under large deformations (grasping, bending, stretching), and the skin is breathable for applications. As expected, the e-fabric skin is proven to be robust for detecting a spatial pressure distribution in real time. The extremely simple fabrication process is also an extra plus point in view of point mass production.

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Three-dimensional weft-knitted textile fabrics-based capacitors

Cited by 9 publications

References 21 publications

Development and evaluation of 3D knitted fabrics to protect against mechanical risk

Development and evaluation of 3D knitted fabrics to protect against mechanical risk

Dielectric Behavior of SBS/Polyaniline Thermally Processable Blends

Simultaneous Sensing of Touch and Pressure by Using Highly Elastic e-Fabrics

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