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Shear Strength of Conductive Adhesive Joints on Rigid and Flexible Substrates Depending on Adhesive Quantity

Abstract

This article deals with the impact of electrically conductive adhesive quantity on the shear strength of joints glued by adhesives “EPO-TEKⓇ H20S” and “MG8331S” on three types of substrates (FR-4, MELINEXⓇST504, DuPont™ PyraluxⓇAC). These joints were made by gluing chip resistors 1206, 0805 and 0603, with two curing profiles for each adhesive. Different thicknesses of stencil and reductions in the size of the hole in stencils were used for this experiment. These differences have an effect on the quantity of conductive adhesives which must be used on the samples. Samples were measured after the curing process by using a shear strength test applied by the device LabTest 3.030. This article presents the effects of different curing profiles, various types of substrates, and different quantities of adhesives on the mechanical strength of the joint.

Open access
Screen printed and laminated electrodes for low-cost capacitive level measurement systems

Abstract

The fabrication procedure and characterization of low-cost electrodes for capacitive level sensors realized on a flexible substrate are presented in this paper. The aim was to prepare conductive electrodes by printing of silver and PEDOT:PSS pastes on coated PET foil. Individual interdigital capacitors and a system with embedded microcontroller readout were designed for a comparative study. Individual capacitors in the form of interdigital electrodes (IDT) were designed with different finger width/spacing dimensions from 300/300 μm to 800/800 μm, a finger length 10 mm and 15 mm and an overall length of 100 mm. A demonstrator device featuring an integrated microcontroller, sensing and reference capacitive sensors and a resistive temperature sensor was realized to proof a practical utilization. The microcontroller is used to calculate capacitances of IDT electrodes in terms of charging time proportional to the fluid level. The design with reference capacitor can be directly applied to different fluids with a wide range of conductivities and dielectric constants without recalibration. The printed structures were thermally laminated with covering PET foil. The sensitivity of the fabricated devices was characterized in liquids with different relative permittivity and conductivity (water and oil). The highest measured sensitivity was 0.7 pF/mm and 0.08 pF/mm for water and oil respectively, with resolution down to 0.1 mm.

Open access
Influence of Dry Cleaning on the Electrical Resistance of Screen Printed Conductors on Textiles

References [1] MeoliD., May-PlumleeT. 2002. Interactive electronic textile development: A review of technologies» Journal of Textile and Apparel Technology and Management. vol.2, p.1-12. [2] Merilampi S., Laine-Ma T., Ruuskanen P. 2009. The characterisation of electrically conductive silver ink patterns on flexible substrates. Microelectronics Reliability. vol.49, p.782-790. [3] Yang Y.L., Chuang M.C., Lou S.L., Wang J. 2010. Thick-film textile-based amperometric sensors and biosensors. Royal Society of Chemistry. vol.135, p.1230-1234. [4

Open access
Properties Of Thin Metal Layers Deposited On Textile Composites By Using The Pvd Method For Textronic Applications

thin layers of different shapes produced on flexible substrates, in Polish Przegląd Elektrotechniczny (Electrical Review) 2014 vol.90, no. 12, Pages 233-236 [24] Lacour S.P., Wagner S., Huang Z., Suo Z.: Stretchable gold conductors on elastomeric substrates, Applied Physics Letters, Volume 82, Issue 15, 14 April 2003, Pages 2404- 2406 [25] Mattmann C., Clemens F., Tröster G.: Sensor for measuring strain in textile, Sensors, Volume 8, Issue 6, June 2008, pp. 3719-3732 [26] Korzeniewska E., Duraj A., Krawczyk A

Open access