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Overview of Ceramic Interconnect Technolgy
Published in Fred D. Barlow, Aicha Elshabini, Ceramic Interconnect Technology Handbook, 2018
Aicha Elshabini, Gangqiang Wang, Dan Amey
Thick-film components include passive components, such as conductors, resistors, dielectrics (both capacitors and insulators), varistors, filters, couplers, transmission lines, and other components. To achieve these electrical elements with desired electrical properties, thick-film materials are formulated into pastes or inks possessing a certain viscosity to undergo a specific heating cycle. These pastes or inks do differ in density, viscosity, solid contents, and function served in the electrical circuit. As stated earlier, the printing process requires a screen-printing machine equipped with a good screen possessing the right specifications. Printing the inks on the substrate involves a squeegee pressing the ink through a stencil on the screen. The ink at the bottom of the screen contacts and wets the substrate because of the surface tension of the ink, and the substrate pulls the ink through the openings of the screen when the screen snaps back off the substrate.
Technologies Suitable for Fabrication of Humidity Sensing Layers
Published in Ghenadii Korotcenkov, Handbook of Humidity Measurement, 2020
The squeegee is essentially a flexible blade, whose function is to transfer the paste through the screen and onto the substrate. During printing, the squeegee forces ink through the open areas of the mesh and, by virtue of the surface tension between the film and substrate, the required pattern is transferred to the substrate as the screen and substrate separate. The squeegee’s shape, the material, and the pressure are all factors that dictate the life of the screen and the squeegee. Clearly, the squeegee must be resistant to the solvents and inks used in thick-film processing. Polyurethane and neoprene are common materials used for squeegee fabrication.
Preparation and characterization of ZnFe1.2Cr0.8O4 water-based ceramic inks obtained using a polymeric dispersant
Published in Journal of Dispersion Science and Technology, 2023
Jun Zhou, Pinggen Rao, Shanjun Ke, Tianjie Zhang
In order to evaluate the color performance of the ceramic inks, they were printed onto ceramic glaze surface by screen printing method. The inks were poured on one end of the screen mesh (mesh size: 50 μm, three gray scale of 30%, 60%, and 100%), applying a certain pressure on the inks part with a squeegee, and then moving toward the other end of the screen mesh. The inks were squeezed from the screen mesh of the graphic part to the glaze surface with the movement of the squeegee[20] and then fired in the roller kiln. The firing conditions and characteristics of glaze were the same as those in our previous study.[2] The CIE-L*a*b* parameters were measured using a colorimeter (X-Rite 8200, X-Rite, USA), a standard illuminant (D65) and a standard white ceramic tile were used as references.
The impact of printable interlining printing pattern on hand value of wool fabrics
Published in The Journal of The Textile Institute, 2023
Each condition was orthogonally combined with eight types of printing patterns to produce 48 combinations of wool fabrics with various types of printable interlinings. Each combination was tested three times for stiffness, fullness and softness, smoothness, and THV. The logic behind the design of the patterns was to account for the impact of printing density and stencil pattern on the dependent variables of hand value. Therefore, under identical printing density, the stencil pattern was different; likewise, under identical stencil pattern, the printing density was different. We adopted the most used stencil patterns with density, including stripes (vertical or horizontal stripes, and stripes at an angle), dots, squares, and swallow grid (Figure 3). Therefore, in short, to investigate the influence of printing pattern on hand value, three printing technique variables, i.e. agent viscosity, mesh, and frequency, together with eight printing stencil pattern designs with different printing densities, were defined as the independent input variables. The dependent variables were the primary hand values (including stiffness, fullness and softness, and smoothness) and the THV. Agent viscosity varied from 12800 to 172000 (mPa.s/25 °C) for the light and medium weight wool fabrics. Printing screen meshes were 160 and 200 T for light and medium weight fabrics. The scraping frequency was 3 and 6 times for light and medium weight fabrics. Screen printing gauzes were made from synthetic polyamide (Nylon) and polyester (Terylene) fibers. A squeegee was used to force the ink through the screen mesh and stencil onto the printing stock below. The squeegee was pressed down into contact with the print screen, whilst being held at an angle of 75