scholarly journals Printed Nanocarbon Heaters for Stretchable Sport and Leisure Garments

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 573
Author(s):  
Andrew Claypole ◽  
James Claypole ◽  
Neil Bezodis ◽  
Liam Kilduff ◽  
David Gethin ◽  
...  
Keyword(s):  
Screen Printing ◽  
Temperature Response ◽  
Thermal Inertia ◽  
Conductive Ink ◽  
Graphite Nanoplatelets ◽  
Carbon Particles ◽  
Heating Uniformity ◽  
Rapid Temperature ◽  
Maintain Body Temperature ◽  
Sporting Performance

The ability to maintain body temperature has been shown to bring about improvements in sporting performance. However, current solutions are limited with regards to flexibility, heating uniformity and robustness. An innovative screen-printed Nanocarbon heater is demonstrated which is robust to bending, folding, tensile extensions of up to 20% and machine washing. This combination of ink and substrate enables the heated garments to safely flex without impeding the wearer. It is capable of producing uniform heating over a 15 × 4 cm area using a conductive ink based on a blend of Graphite Nanoplatelets and Carbon Black. This can be attributed to the low roughness of the conductive carbon coating, the uniform distribution and good interconnection of the carbon particles. The heaters have a low thermal inertia, producing a rapid temperature response at low voltages, reaching equilibrium temperatures within 120 s of being switched on. The heaters reached the 40 °C required for wearable heating applications within 20 s at 12 Volts. Screen printing was demonstrated to be an effective method of controlling the printed layer thickness with good interlayer adhesion and contact for multiple printed layers. This can be used to regulate their electrical properties and hence adjust the heater performance.

scholarly journals Versatile carbon-loaded shellac ink for disposable printed electronics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexandre Poulin ◽  
Xavier Aeby ◽  
Gilberto Siqueira ◽  
Gustav Nyström
Keyword(s):  
Screen Printing ◽  
Printed Electronics ◽  
Environmental Concern ◽  
Conductive Ink ◽  
Proof Of Concept ◽  
Electronic Components ◽  
Feature Size ◽  
Carbon Particles ◽  
Minimum Feature Size ◽  
Rheology Modifier

AbstractEmerging technologies such as smart packaging are shifting the requirements on electronic components, notably regarding service life, which counts in days instead of years. As a result, standard materials are often not adapted due to economic, environmental or manufacturing considerations. For instance, the use of metal conductive tracks in disposable electronics is a waste of valuable resources and their accumulation in landfills is an environmental concern. In this work, we report a conductive ink made of carbon particles dispersed in a solution of shellac. This natural and water-insoluble resin works as a binder, favourably replacing petroleum-derived polymers. The carbon particles provide electrical conductivity and act as a rheology modifier, creating a printable shear-thinning gel. The ink’s conductivity and sheet resistance are 1000 S m−1 and 15 Ω sq−1, respectively, and remain stable towards moisture. We show that the ink is compatible with several industry-relevant patterning methods such as screen-printing and robocasting, and demonstrate a minimum feature size of 200 μm. As a proof-of-concept, a resistor and a capacitor are printed and used as deformation and proximity sensors, respectively.

Preparation of Conductive Nanosilver Ink and its Application on RFID Tags

2014 ◽  
Vol 904 ◽  
pp. 121-125 ◽  
Author(s):  
Ji Lan Fu ◽  
Ya Ling Li ◽  
Li Xin Mo ◽  
Yu Wang ◽  
Jun Ran ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Screen Printing ◽  
Surface Resistance ◽  
Large Scale ◽  
Printed Electronics ◽  
Silver Content ◽  
Rfid Tags ◽  
Rheological Characteristics ◽  
Conductive Ink ◽  
New Type

The recent dramatic progress in the printed electronics and flexible electronics, due to the universality of the substrates including the foldable and stretchable substrates, has opened a new prospect in the field of future electronics. In this paper, silver nanospheres in large-scale are synthesized, the nanosilver ink with 63.88% silver content are prepared and a new type of highly conductive and far identify distance RFID tags are manufactured. Especially there are no resin and other additives containing in our conductive ink which satisfy the rheological characteristics and process of screen printing. The tags exhibit the best radiation performance own to there is no high temperature sintering in need. The surface resistance of the tags could be 80 mΩ/, and the identify distance reach to 6.0m. Keywords:silver nanoparticles, conductive ink, RFID tags

scholarly journals Comparison of E-Textile Techniques and Materials for 3D Gesture Sensor with Boosted Electrode Design

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2369 ◽  
Author(s):  
Josue Ferri ◽  
Raúl Llinares Llopis ◽  
Gabriel Martinez ◽  
José Vicente Lidon Roger ◽  
Eduardo Garcia-Breijo
Keyword(s):  
Screen Printing ◽  
Critical Parameters ◽  
Electrode Design ◽  
Conductive Ink ◽  
Detection Rates ◽  
Conductive Materials ◽  
Specific Parameter ◽  
Environmental Variations ◽  
Manufacturing Techniques ◽  
The Stability

There is an interest in new wearable solutions that can be directly worn on the curved human body or integrated into daily objects. Textiles offer properties that are suitable to be used as holders for electronics or sensors components. Many sensing technologies have been explored considering textiles substrates in combination with conductive materials in the last years. In this work, a novel solution of a gesture recognition touchless sensor is implemented with satisfactory results. Moreover, three manufacturing techniques have been considered as alternatives: screen-printing with conductive ink, embroidery with conductive thread and thermosealing with conductive fabric. The main critical parameters have been analyzed for each prototype including the sensitivity of the sensor, which is an important and specific parameter of this type of sensor. In addition, user validation has been performed, testing several gestures with different subjects. During the tests carried out, flick gestures obtained detection rates from 79% to 89% on average. Finally, in order to evaluate the stability and strength of the solutions, some tests have been performed to assess environmental variations and washability deteriorations. The obtained results are satisfactory regarding temperature and humidity variations. The washability tests revealed that, except for the screen-printing prototype, the sensors can be washed with minimum degradation.

Study of RFID Tag Antenna Manufacturing Based on Printing Technology

2013 ◽  
Vol 329 ◽  
pp. 135-138
Author(s):  
Cai Feng Liu ◽  
Di Feng Lu ◽  
Fui Gui Yan ◽  
Yang Mei
Keyword(s):  
Screen Printing ◽  
Influence Factors ◽  
Conductive Ink ◽  
Three Solutions ◽  
Printing Technology ◽  
Rfid Tag ◽  
Effective Work ◽  
Printing Quality ◽  
The Cost

To study printing technology used in the RFID field, just want to make the cost of tags much lower. Since printing technology has widely used in RFID field,there are many problems. Through analysis of influence factors of antenna printing technology, three solutions to solve the difficultys of RFID tag antenna manufacturing use of printing technology. In order to improve the printing quality of the printed ink film of the RFID tag antenna, many factors should be considered. Finally, agrees that the future of conductive ink screen printing manufacturing RFID tag antenna technology is splendid with our effective work.

Influence of the Structure and Material Parameters on the Temperature Field in a Vacuum Near-Infrared Hot-Pressing Furnace

2013 ◽  
Vol 694-697 ◽  
pp. 724-727
Author(s):  
Tian Yi Shi ◽  
Lian Guan Shen ◽  
Mu Jun Li ◽  
Jian Zhou ◽  
Yang Hu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Near Infrared ◽  
Temperature Response ◽  
Central Temperature ◽  
Insulating Materials ◽  
Insulating Material ◽  
Material Parameters ◽  
Heating Performance ◽  
Rapid Temperature ◽  
Heating Technology

With its rapid temperature response and high thermal efficiency, near-Infrared (NIR) heating technology is widely used in modern industry, especially in heating furnace. In order to investigate influence of structure and material properties on the heating performance of a vacuum NIR hot-pressing furnace, a series of numerical simulations are utilized. On a variety of factors of power, insulating materials, shielding layers, an optimal proposal is revealed. As a result, the central temperature of the furnace can be up to over 600°C within 20 minutes and the temperature on the outside wall of furnace can be kept to a safe degree for operator, with only one shielding layer of Mo and a silica aerogel layer of 20mm thickness, a kind of excellent heat insulating material.

Influence of Resins on Properties of Copper Screen Printing Conductive Ink

2012 ◽  
Vol 262 ◽  
pp. 547-550 ◽  
Author(s):  
Xin Ming Fan ◽  
Li Xin Mo ◽  
Wen Bo Li ◽  
Wei Wei Li ◽  
Jun Ran ◽  
...  
Keyword(s):  
Surface Layer ◽  
Screen Printing ◽  
Printed Electronics ◽  
Acrylic Resin ◽  
Electronics Industry ◽  
Conductive Ink ◽  
Conductive Material ◽  
Copper Particles ◽  
Acrylic Resins ◽  
Roll Mill

·Copper conductive inks for screen printing are being given great attention due to their widely application in printed electronics industry. In this study, copper conductive ink used for screen printing, which were grinded by three-roll mill machine, was prepared using the epoxy, polyurethane and acrylic resins as adhesive, the flake copper particles which had a diameter between 20 to 50 μm as conductive material and butly alcohol was chosen as solvent. The viscosity and the thixotropy of the conductive ink were measured by rheometer. The oxidation of the surface layer of copper were removed by submerged in a certain concentration of acid solution and the resistance of the sample was measured after heated at different various temperatures. The results showed that the rheology were better for screen printing by adding the acrylic resin and the minimum conductivity can be reached 1.93×10-3 Ω·cm.

scholarly journals Research on Surface Modification of Screen Printing Electronics

2021 ◽  
Author(s):  
Ye Tian ◽  
Yan Li ◽  
Ying-Cai Yuan ◽  
Lin Zhao ◽  
Gao-Shen He ◽  
...  
Keyword(s):  
Contact Angle ◽  
Screen Printing ◽  
High Efficiency ◽  
Adhesion Force ◽  
Liquid Volume ◽  
Actual Process ◽  
Conductive Ink ◽  
Model And Simulation ◽  
Solid Liquid

Abstract Printing electronic components by screen printing with its excellent printing quality, high efficiency, and green environmental protection have broad application prospects in additive manufacturing. However, efficiency and quality of printing were decreased as conductive-ink blocking screen in the actual process of printing. Thus, it is pivotal that exploring factors of adhesion from the interaction of conductive-ink and screen. Herein, the functional relationship between adhesion and factors of adhesion and influence trend of adhesion on ink residue was obtained via the establishment of liquid-bridge adhesion model between two plates according to screen printing ink transfer process, solid-liquid wetting theory, and adhesion mechanism, which was verified by software Fluent. In order to justify the accuracy of the model and simulation, the adhesion and ink residue were tested on the surface-modified glass sheet as the result that the model and simulation were consistent with the experimental record. It was demonstrated that solid-liquid contact angle, tensile distance, and liquid volume are the main factors affecting the change of solid-liquid adhesion. With the increase of tensile distance and contact angle, the adhesion force decreases, which causes the decline of the residual amount of liquid on the solid surface. By means of screen modification, the adhesion between conductive-ink and screen can be reduced, as meanwhile the efficiency and quality of printed products can be improved.

TOPHEL-NIAL

Alloy Digest ◽  
1977 ◽  
Vol 26 (9) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Response ◽  
Heat Treating ◽  
Temperature Relation ◽  
Type K ◽  
Rapid Temperature ◽  
Nickel Base ◽  
High Emissivity ◽  
Better Than

Abstract TOPHEL-NIAL are nickel-base alloys that were developed to provide industry a type K thermocouple in which each leg possesses an adherent, tenacious, black oxide with high emissivity for rapid temperature response. Its EMF-temperature relation is in accordance with NBS Circular 561. Consequently, TOPHEL-NIAL can be used on any existing instrument calibrated for a type K couple. Its stability of E.M.F. is equivalent, or better, than that of other type K thermocouples. TOPHEL and NIAL are suitable for temperatures up to 23000 F. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming, heat treating, and machining. Filing Code: Ni-250. Producer or source: Wilbur B. Driver Company.

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