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Dissertations / Theses on the topic 'Screen printing'
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White, Gordon Sutherland. "Mathematical models of screen printing." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437003.
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Dolden, Elisabeth Diane. "Fundamental investigations into screen printing." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422613.
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Medina, Rodríguez Beatriz. "Inkjet and screen printing for electronic applications." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400486.
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Printed electronics (PE) is a set of printing methods used to create electrical devices on various substrates. Printing typically uses common printing equipment suitable for defining patterns on material, such as screen printing, flexography, gravure, offset lithography, and inkjet. Electrically functional, electronic or optical inks are deposited on the substrate, creating active or passive devices.
PE offers a great advantage when compared to traditional processes or microelectronics due to its versatility, low manufacturing cost and the possibility of generating flexible circuit componentsi. Furthermore, these techniques are suitable for roll-to-roll processes and open the possibility for printing large areas and in a large-scale production. .
The selection of the printing technique is crucial to achieve a good result and it will largely depend on both, the material needed and dimensional and functional requirements pursued. Each technology offers different possibilities in terms of resolution, complexity, versatility, speed, layers thickness, materials, reliability and scalability. This work aims to dig deeper into two of the main techniques in the world of printed electronics: screen printing and inkjet printing for different applications and for the manufacturing of different devices. In addition, the capabilities of a technology that is currently in growing development (inkjet) are analyzed in comparison with the mature screen printing technique to give a wider insight of the advantages and limitations that this technology offers. The totally knowledge in this technique is still in progress and it arises to be a trend in technological and scientific aspects due to the barely availability of functional materialsii and the difficulties in achieving a precise control on the drop formation and its interaction in the final system. A better understanding of these technological issues, as well as the approaching to current difficulties in electronic applications is accomplished in this thesis. Up-to-date issues as the reliability of flexible resistive gas sensors, solution-based synthesis of absorber layers in thin film solar cells and the tuning and area reducing for inductors in RF applications are tackled.
The main objective in this thesis arises from the need of expanding the knowledge on inkjet printing by exploring affordable new possibilities, taking as starting point the previous knowledge of screen printing. To pursue this goal, the comparison between SP and IP is presented along the thesis. The framework of this thesis is not solely an overview of the
development of functional materials for both techniques, but also the investigation of its final implementation reliability in several devices for different electronic applications.
The structure of this thesis dissertation can be divided in two well defined blocks. In chapter 2 and 3, both printing techniques are explained in detail, while in Chapter 4, 5 and 6, the potential of both technologies are studied for different electronic applications by means of the fabrication and characterization of different devices.
In chapter 2, the main topic is the analysis of the inkjet printing technique. This chapter follows the attainment of two different objectives: the establishment of a quality evaluation guideline for any inkjet ink and as example of it, the formulation of our own silver ink developed in our laboratory. In this sense, the most important properties for the functional materials which should be under control during its formulation are reviewed; as well as the fundamentals and main parameters during the printing process, which affect the outcome quality. Instead, in chapter 3, the fundamentals of screen printing technique are quickly overviewed due to the consolidation of the technique knowledge and the previous studies on it done in the field, and specifically at FAE Company.
In the second block of this thesis, the description of the printing techniques leads to the implementation of both, inkjet and screen printing, in different electronic fields. The chapters involving this block are focused in the printing step during its fabrication, the printing and functional material quality characterization, and the influence of this printing step in the functional performance of the devices.
Chapter 4 is a comparison between low-cost flexible resistive sensor platforms with heater fabricated by both, SP and IP techniques. The performance of these sensor platforms was checked by long-term characterization and aging tests to identify the causes of the device failure. Chemical degradation of silver is observed in SP-devices due to the flake-like morphology of the deposits but not in the smooth sintered silver tracks deposited by IP. However, the IP very thin film promotes failure by hot spot phenomena. Design improvements are, hence, implemented to overcome the drawbacks of silver corrosion and power consumption. The final devices turned to be sturdy, wearable and reliable gas sensor platforms.
In Chapter 5, IP is implemented in the step of the absorber layer synthesis for the fabrication of kesterite thin film solar cells. Copper-Zinc-Tin-Sulfur (CZTS) precursor ink is formulated and optimized for the enhancement of the solar cell performance. The influence of the formulation and the printing process is analyzed. Finally, the thickness of the deposited precursor was
modified until obtained a cell with 6.55% efficiency, the higher efficiency reported with this absorber type using IP as deposition method.
In the last chapter, Chapter 6, spiral inductors are fabricating using the two printing technologies in LTCC (low-temperature-cofired-ceramics). IP, although turning out to be a suitable technology for enhancing the accuracy of narrower tracks than SP and thus, for increasing the number of turns within a concrete area, presents difficulties to achieve a certain value in electrical conductivity due to the deposition of very thin conductor layers. For this reason, in this part of the thesis, a combination of IP with electroless copper deposition is used to overcome this limitation and to develop equivalent performances using SP and IP devices.<br>La electrónica impresa permite la impresión de dispositivos electrónicos ofreciendo una gran ventaja en comparación con procesos tradicionales o microelectrónica debido a su versatilidad, bajo coste de producción y posibilidad de generar circuitos flexibles.
La selección del método de impresión es crucial a la hora de alcanzar un buen resultado y depende de los materiales necesarios y de los requerimientos dimensionales y funcionales. En esta tesis, la serigrafía, una técnica de impresión fiable y consolidada en la industria desde hace años, es comparada con la inyección de tinta (inkjet), que aún muestra un gran desafío en cuanto a rendimiento y reproducibilidad. Cada tecnología ofrece posibilidades diferentes en complejidad, resolución, grosor de capas y materiales.
En la primera parte de la tesis se describen la inyección de tinta y la serigrafía en términos de fundamentos, parámetros y formulación de materiales. En la segunda parte, el potencial de ambas tecnologías se ha estudiado en diferentes escenarios mediante la fabricación de diversos dispositivos electrónicos. En el estudio de la fiabilidad y robustez de plataformas sensoras flexibles se ha encontrado una relación directa entre la morfología de la plata depositada y su causa de fallo en funcionamiento prolongado. La sinterización de las nanoparticulas depositadas por inkjet forma una capa lisa y con poca porosidad que evita parcialmente la corrosión, a diferencia de la pasta de plata impresa por serigrafía. Sin embargo, su bajo provoca defectos puntuales que puede causar puntos calientes. También, inkjet se ha empleado para la síntesis de precursores de la capa absorbente para celdas solares de capa fina. Se ha formulado una tinta de precursores de cobre, zinc, estaño y azufre (CZTS) para la formación de kesterita obteniéndose celdas de 6.55% de eficiencia, siendo la más alta reportada hasta la fecha utilizando este tipo de absorbente y tecnología. Sin embargo, en aplicaciones donde la conductividad es crucial para altas prestaciones, como en radiofrecuencia, queda patente la desventaja del inkjet sobre la serigrafía, donde su escaso grosor de capa es un claro hándicap para la obtención de conductividades elevadas. Dicho factor limitante es abordado con la combinación de la inyección de tinta con la deposición química (electroless) de níquel y cobre, consiguiéndose inductores equivalentes a los serigrafiados.
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Fox, Ian James. "Ink flow within the screen-printing process." Thesis, Swansea University, 2002. https://cronfa.swan.ac.uk/Record/cronfa42565.
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Screen-printing is one of the oldest printing processes, yet its market share remains very limited due to its slower printing speeds compared to the other available processes. This is mainly because of the reciprocating motion of the squeegee upon the printing screen. In order for screen-printing to become more competitive, the concept of a high-speed continuous belt screen-printing press was developed. However, this will produce an increase in squeegee wear and friction of the squeegee upon the screen. For this reason, this work investigated the use of a roller squeegee that could rotate across the screen. It has been proven that screen-printing with a roller squeegee can be successfully achieved. Additionally, in terms of density and tone gain, these images were comparable to those produced with traditional blade squeegees. A numerical model has been developed to simulate the characteristics that will be encountered within the ink film when printing with a roller squeegee. Numerical simulations were run where the settings corresponded to the parameters utilised in experimental trials. Here, it was discovered that an increase in squeegee diameter will increase the ink film on the squeegee and will also increase the contact width of the screen upon the substrate. This will have the effect of increasing the pumping capacity of the squeegee, which will therefore increase the ink deposit. This was confirmed in the experimental trials. It was also shown that the locking of the squeegee increased the shear mechanism within the ink film, resulting in a reduction in the ink viscosity within the nip contact region. This had the effect of reducing the ink film thickness on the squeegee, which reduces the pumping capacity of the squeegee, thus producing a reduced ink deposit. Additionally, this work is the first method that has been able to estimate the height of the ink deposit for a range of halftone open areas where the results correspond almost identically to the actual printed heights of the prints obtained in experimental studies. This work has improved the fundamental understanding of the mechanics and the process physics within the ink transfer mechanism in the screen-printing process. Use of experimental and numerical models has resulted in new theories being developed that will further the knowledge of the process. This has led to the design and manufacture of a high-speed rotary screen-printing press that will enable high-speed, continuous screen-printing.
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Taroni, Michele. "Thin film models of the screen-printing process." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540261.
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Hill, Matthew Raymond. "Preparation of catalyst coated membranes using screen printing." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/11834.
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Includes abstract.<br>Includes bibliographical references.<br>Of the various types of fuel cells, Polymer Electrolyte Fuel Cells (PEFCs) have already been demonstrated in transportation appliances from light-duty vehicles to buses and in portable appliances including laptops and cell phones. A key component of a PEFC is its platinum electrocatalyst. With an estimated 75% of the world’s platinum reserves and resources in South Africa, local development of this technology will allow South Africa to become a major player in the growing hydrogen economy. This project therefore forms part of the Department of Science and Technologies strategy, to develop fuel cell technology in South Africa. More specifically, this study aims to contribute to the development of membrane electrode assembly (MEA) platform technology at the HySA/Catalysis Centre. In order to achieve this goal, a catalyst coated membrane (CCM) fabrication procedure was implemented using a newly acquired screen printer. In this procedure, catalyst ink is forced through a mesh onto a substrate, where it can then be transferred to a membrane via decal transfer to form a CCM. Two gas diffusions layers can then be placed on either side of the CCM forming a 5-layered MEA. Characterisation techniques of the catalyst ink, CCM and 5-layered MEA were successfully implemented such that future researchers can expand on the ideas. Catalyst inks with varying amounts of isopropanol, 1,2-propanediol and water were screened for their suitability for screen printing. In particular the catalyst ink rheology required for a smooth and even printed surface was determined for a given screen and squeegee combination. With all the established steps in pace, screen printing proved to be a fast and reliable approach for CCM fabrication with potential for future scale up and commercialisation. The fabricated CCMs performed on a par with a commercial Ion Power CCM, but under performed in comparison to a commercial Johnson Matthey (JM) MEA. Possible reasons for this include improved materials in the JM MEA and cell conditions favouring the JM MEA. Future projects which specifically arise from this work entail an investigation into the water management of the fuel cell environment at HySA/Catalysis, as well as a modification of the various steps in order to optimise the process and in doing so manufacture commercially viable MEAs.
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Bougàs, Aristotelis Platon. "Influence of ink sequence on color's hue and saturation in four color halftone screen printing /." Online version of thesis, 1993. http://hdl.handle.net/1850/11080.
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Choudhry, Nadeem Azram. "New directions in screen printing and related fabrication processess." Thesis, Manchester Metropolitan University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588608.
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This thesis reports the development of screen printed electrodes and associated fabrication processes in order to develop and understand new electrochemical based sensors. There are three main sections to this thesis. In the first part, an overview of sensors, in particular electrochemical sensors, that are commercially available and their current problems and limitations with conventional electrodes and electrode materials is discussed. Second, an introduction into screen printing and their advantages are given. The full process by which these next generation electrodes are manufactured is thoroughly described followed by examples of screen printed-electrodes and their powerful application as well as their low detection limits which compare well to existing literature on the market. The first example of a copper (11) oxide screen-printed electrode is reported, which is characterised with microscopy and its efficiency for the electrochemical sensing of glucose, maltose, sucrose and fructose is explored. It is shown that the non-enzymatic electrochemical sensing of glucose with cyclic voltammetry and amperometry is possible with low micro-molar up to milli-molar glucose readily detectable, which compares competitively with nano-catalyst modified electrodes. An additional benefit of this approach is that metal oxides with known oxidation states can be incorporated into the screen- printed electrodes allowing one to identify exactly the origin of the observed electro- catalytic response which is difficult when utilising metal oxide modified electrodes formed via electro-deposition techniques which result in a mixture of metal oxides/oxidation states. These next generation screen printed electrochemical sensing platforms provide a simplification offering a novel fabrication route for the mass production of electro-catalytic sensors for Analytical and Forensic applications. Other examples such as, bespoke screen printed electrodes which can be used as a template to produce randomly dispersed electro- catalytic micro-domains for analytical sensing purposes, are also shown to further demonstrate the applications and utility of screen printed electrodes. The final section focuses on electrode design. It is demonstrated that the electron transfer properties of disposable screen-printed electrodes can be readily tailored via the introduction of a polymeric formulation into the ink used in their fabrication. This approach allows the role of the binder on the underpinning electrochemical properties to be explored and quantified for the first time, allowing the electrochemical reactivity of the screen- printed electrodes to be tailored from that of edge plane-like to basal plane-like reactivity of highly ordered pyrolytic graphite. Building on this fundamental study of the origin of electron transfer at these novel electrodes, the first example of "Cosmetic Electrochemistry" is demonstrated where a commercially available cosmetic product, a deodorant, can be used to confer microelectrode behaviour on a macroelectrode. Proof-of-concept is shown that a graphite screen-printed electrode can be sprayed with an off-the-shelf cosmetic product and within seconds is ready to use. The polymer contained within the cosmetic product partially blocks the graphite screen-printed electrode surface leaving the underlying graphite electrode exposed in the form of graphite micron-sized sites which are randomly distributed across the electrode surface. The creation of microdomain sites enhance mass transport of the target analyte and it is shown that the electroanalytical performance of the cosmetically modified electrode, via the cathodic stripping of lead, could achieve a similar performance to current state-of-the-art methodologies. Further examples are also reported with the introduction of plaster-trodes where a commercially available plaster is electrolytically modified with electrocatalytic material and is used to detect various alcohols.
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Tan, Fang. "New developments in screen printing for advances in electroanalysis." Thesis, Manchester Metropolitan University, 2013. http://e-space.mmu.ac.uk/324232/.
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Within the discipline of electrochemistry, the sub-section that concerns itself with quantification is electroanalysis, which is the basis of portable and sensitive sensors; this is exemplified in the billion dollar glucose market where their development allows diabetics to measure their blood glucose on-the-spot without recourse to the clinic. Screen-printing is a suitable method to fabricate such a sensor which is mass-produced yet reproducible and economical in nature. In order for the next-generation of biosensors (such as the glucose sensors), advances in screen-printed electrode design needs to be made; this is exactly what this Master’s Thesis aims to achieve. This thesis first considers the fabrication of platinum screen-printed macroelectrodes, which are analytically explored and benchmarked towards the sensing of selected target analytes. Next, palladium screen-printed macroelectrodes are fabricated and characterised via microscopy and cyclic voltammetry, in particular, the electroanalytical applications are explored towards the sensing of formaldehyde, hydrazine and its potential use in gas sensors for the sensing of hydrogen and methane with comparisons made to existing literature reports. Note that such an electrode made entirely via screen-printing has not been reported before in the literature. In order to improve mass transport properties, shallow recessed screen-printed electrodes are designed and fabricated and benchmarked towards the sensing of NADH and nitrite. The electroanalytical sensing of nitrite is further testing within canal water samples showing the robust nature of the sensors analytical performance. Additionally these unique sensors were found to be electrochemically useful in sensing towards hydrazine and hydrogen peroxide. Finally, carbon screen-printed microelectrode arrays are fabricated and are benchmarked towards the sensing of acetaminophen, dopamine and nitrite. Note that this is 3 the first example of an array which exhibits diffusional independence (the current literature reports only arrays that have diffusional interaction) and as such gives rise to analytically useful measurements. This screen printed microelectrode array is also shown to be possible to be produced with gold working electrodes which are benchmarked towards the determination of Chromium (VI).
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Dulina, I. O., S. O. Umerova, and A. V. Ragulya. "Barium Titanate Thin Films Obtained by Screen Printing Technology." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35153.
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Barium titanate thin films have been obtained using screen printing of pastes based on BaTiO3 na-nopowders. Obtained pastes have been characterized by optical microscopy and optical profilometry. De-posit pattern geometry fidelity in regard to screen mask and films thickness and roughness parameter Ra during screen printing parameters changing depended on pastes rheological behavior. In addition, films roughness and thickness were strongly depended on solid and solvent content in pastes. Solvent content rising and BaTiO3 content lowering resulted in films thickness and roughness decreasing. Depending on paste solid and content barium titanate films thickness was changed from 1.56 to 3.18 m, the film rough-ness Ra from 50 to 196 nm and Rz from 160 to 393 nm.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35153
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Laughlin, Kelly. "An investigation of amplitude & frequency modulated screening on dot gain and variability /." Online version of thesis, 1994. http://hdl.handle.net/1850/12162.
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Mannerbro, Richard, and Martin Ranlöf. "Inkjet and Screen Printed Electrochemical Organic Electronics." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8117.
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<p>Linköpings Universitet och Acreo AB i Norrköping bedriver ett forskningssamarbete rörande organisk elektrokemisk elektronik och det man kallar papperselektronik. Målet på Acreo är att kunna trycka denna typ av elektronik med snabba trycktekniker så som offset- eller flexotryck. Idag görs de flesta demonstratorer och prototyper, baserade på denna typ av elektrokemisk elektronik, med manuella och subtraktiva mönstringsmetoder. Det skulle vara intressant att hitta fler verktyg och automatiserade tekniker som kan underlätta detta arbete. Målet med detta examensarbete har varit att utvärdera vilken potential bläckstråleteknik respektive screentryck har som tillverkningsmetoder för organiska elektrokemiska elektroniksystem samt att jämföra de båda teknikernas för- och nackdelar. Vad gäller bläckstråletekniken, så ingick även i uppgiften att modifiera en bläckstråleskrivare avsedd för kontor/hemmabruk för att möjliggöra tryckning av de två grundläggande materialen inom organisk elektrokemisk elektronik - den konjugerade polymeren PEDOT och en elektrolyt.</p><p>I denna uppsats rapporteras om hur en procedur för produktion av elektrokemisk elektronik har utvecklats. Världens första elektrokemiska transistor som producerats helt med bläckstråleteknik presenteras tillsammans med fullt fungerande implementeringar i logiska kretsar. Karaktärisering av filmer, komponenter och kretsar som producerats med bläckstråle- och screentrycksteknik har legat till grund för den utvärdering och jämförelse som har gjorts av teknikerna. Resultaten ser lovande ut och kan motivera vidare utveckling av bläckstrålesystem för produktion av prototyper och mindre serier. En kombination av de båda nämnda teknikerna är också ett tänkbart alternativ för småskalig tillverkning.</p><br><p>Linköping University and the research institute Acreo AB in Norrköping are in collaboration conducting research on organic electrochemical electronic devices. Acreo is pushing the development of high-speed reel-to-reel printing of this type of electronics. Today, most demonstrators and prototypes are made using manual, subtractive patterning methods. More tools, simplifying this work, are of interest. The purpose of this thesis work was to evaluate the potential of both inkjet and screen printing as manufacturing tools of electrochemical devices and to conduct a comparative study of these two additive patterning technologies. The work on inkjet printing included the modification of a commercially available desktop inkjet printer in order to print the conjugated polymer PEDOT and an electrolyte solution - these are the two basic components of organic electrochemical devices. For screen printing, existing equipment at Acreo AB was employed for device production.</p><p>In this report the successful development of a simple system and procedure for the inkjet printing of organic electrochemical devices is described. The first all-inkjet printed electrochemical transistor (ECT) and fully functional implementations of these ECTs in printed electrochemical logical circuits are presented.</p><p>The characterization of inkjet and screen printed devices has, along with an evaluation of how suitable the two printing procedures are for prototype production, been the foundation of the comparison of the two printing technologies.</p><p>The results are promising and should encourage further effort to develop a more complete and easily controlled inkjet system for this application. At this stage of development, a combination of the two technologies seems like an efficient approach.</p>
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Mitchell, M. C. "An experimental and analytical investigation of screen printing process fundamentals." Thesis, Nottingham Trent University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266912.
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Wilson, Josephine Petra. "An investigation into the phenomenon of ghosting in screen printing." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422075.
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Aucklah, Roshan. "Ink formulation and rheological characterisation of zirconia screen printing inks." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8599.
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Solid oxide fuel cells are a developing technology where advanced ceramics play a crucial role. Within the fuel cell the most common electrolyte material is yttria-stabilised zirconia (YSZ). The use of nano particles may provide lower sintering temperatures enabling the possibility of co-sintering the electrolyte with the anode layer. One route for deposition is screen-printing, which is scalable and cost-effective. In this research an aqueous screen-printing route was adopted, which adds the benefits of reduced health and safety risks with reduced costs. The aims of the work were to produce aqueous zirconia inks suitable for screen-printing and to understand the factors involved in ink formulation. The overall objective of the project was to produce a dense impermeable zirconia layer by screen-printing. Sub-micron (~100 nm) and nano (20 nm) primary particles were used to prepare suspensions and inks. The suspensions were optimised for dispersion with the addition of a dispersant (Darvan C or TAC) by zeta potential and rheological methods. The addition of a binder (Rheolate 216) to the suspensions was used to create a 60 wt% screen-printing paste. The inks were characterised by rotational and/or oscillatory rheometry techniques and printed layers were characterised by optical microscopy where cracking was not observed. The input parameters for ink formulation have been investigated. The binder concentration increased the structural properties of the ink and above 5 wt% produced level prints. The dispersant structure was shown to influence the rheological characteristics of the ink. This was linked to the interaction of binder and dispersant. This thesis has shown that it was possible to formulate an aqueous sub-micron zirconia ink that levels after printing and does not crack during drying. Defects in the form of pinholes still remained. Excessively high drying rates were obtained from the aqueous ink making it difficult to process over long time periods and this was overcome through the use of co-solvents at a cost of print quality. Surfactants have been shown to improve the printed layer, but a fully optimised ink has not been found.
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Chou, Lawrence Chao-Shan. "Development of a glucose sensor using screen-printing and electrophoretic." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1301507295.
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Anderson, John Thomas. "An investigation into the physical aspects of the screen printing process." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521493.
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Chen, Ted. "A study of color image quality with respect to screen angle arrangement in multicolor halftone printing /." Online version of thesis, 1987. http://hdl.handle.net/1850/9674.
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Adamcewicz, Justine E. "A study on the effects of dot gain, print contrast and tone reproduction as it relates to increased solid ink density on stochastically screened images verus conventionally screened images /." Online version of thesis, 1994. http://hdl.handle.net/1850/11989.
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Xu, Chenhui [Verfasser], and N. [Akademischer Betreuer] Willenbacher. "Screen Printing and Rheology of Pastes / Chenhui Xu ; Betreuer: N. Willenbacher." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1179963636/34.
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Wei, Yang. "Screen printable sacrificial and structural pastes and processes for textile printing." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/360759/.
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This thesis presents a new approach for fabricating free standing structures on flexible substrates using the screen printing technique. The research addresses electronic textile applications and is intended to provide a new method for realising sensors and complex structures on fabrics. Conventional smart fabric fabrication methods, such as weaving and knitting, are only able to achieve planar structures with limited functionality. Packaged discrete sensors can also be attached directly to fabrics but this approach is unreliable and unsuitable for mass production. The reported materials and the fabrication processes enable free standing structures to be formed by printing functional layers directly on top of the fabric. This reduces the fabrication complexity and increases wearer comfort and the flexibility of the fabric. This research details an investigation into sacrificial materials suitable for use on fabrics. A plastic crystalline material (Trimetlylolethane (TME)) was identified as an appropriate sacrificial material because it sublimates which reduces the chance of stiction occurring. A screen printable TME paste has been achieved by dissolving TME powder in a solvent mixture of cyclohexanol (CH) and propylene glycol (PG). The TME sacrificial paste can be cured at 85 oC for 5 minutes providing a solid foundation for subsequent printed layers. This sacrificial layer can be removed in 30 minutes at 150 oC leaving no residue. EFV4/4965 UV curable dielectric material was identified as an appropriate structural material for use with TME. The feasibility of the sacrificial and structural materials has been demonstrated by the fabrication of free standing cantilevers and microfluidic pumps on fabrics and flexible plastic films. Printed cantilevers, with capacitive and piezoelectric sensing mechanisms, have been demonstrated as human motion sensors. A printed microfluidic pump with a maximum pumping rate of 68 μL/min at 3 kHz has also been demonstrated. Both the cantilever and micropump have been demonstrated, for the first time, on fabrics and polyimide substrates, respectively.
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Mathe, Ntombizodwa. "The rheology of silicon nanoparticle inks fro screen printing electronic devices." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/6536.
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In the development of inks for printed electronics, it is important to understand the behaviour of the functional inks and more especially their rheology and surface properties. This project emphasises the importance of ink characterization by performing rheological tests on silicon nanoparticle based inks that are used in the screen printing of electronic devices. The inks were characterized for linear viscoelastic behaviour, flow behaviour, change in properties with angular frequency, as well as thixotropic behaviour. All showed shear thinning, with the more dilute inks showing a power law (Ostwald / de Waele model) behaviour dependence of complex viscosity on angular frequency. The flow behaviour of the inks was also seen to follow a Windhab model. The printability of the inks primarily depends on the shear-dependent viscosity as highly viscous and dilute inks do not produce good printed structures. The printed layers showed electrical and optical activity.
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Willfahrt, Andreas. "Screen Printed Thermoelectric Devices." Licentiate thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106006.
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Thermoelectric generators (TEG) directly convert heat energy into electrical energy. The impediments as to why this technology has not yet found extensive application are the low conversion efficiency and high costs per watt. On the one hand, the manufacturing process is a cost factor. On the other, the high-‐priced thermoelectric (TE) materials have an enormous impact on the costs per watt. In this thesis both factors will be examined: the production process and the selection of TE materials. Technical screen printing is a possible way of production, because this method is very versatile with respect to the usable materials, substrates as well as printing inks. The organic conductor PEDOT:PSS offers reasonable thermoelectric properties and can be processed very well in screen printing. It was demonstrated by prototypes of fully printed TEGs that so-‐called vertical printed TEGs are feasible using standard graphic arts industry processes. In addition, the problems that occur with print production of TEGs are identified. Finally, approaches to solve these problems are discussed.
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Jamshidi, Gohari Ebrahim. "Buried screen-printed contacts for silicon solar cells." Thesis, Högskolan Dalarna, Energi och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:du-13593.
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A Simple way to improve solar cell efficiency is to enhance the absorption of light and reduce the shading losses. One of the main objectives for the photovoltaic roadmap is the reduction of metalized area on the front side of solar cell by fin lines. Industrial solar cell production uses screen-printing of metal pastes with a limit in line width of 70-80 μm. This paper will show a combination of the technique of laser grooved buried contact (LGBC) and Screen-printing is able to improve in fine lines and higher aspect ratio. Laser grooving is a technique to bury the contact into the surface of silicon wafer. Metallization is normally done with electroless or electrolytic plating method, which a high cost. To decrease the relative cost, more complex manufacturing process was needed, therefore in this project the standard process of buried contact solar cells has been optimized in order to gain a laser grooved buried contact solar cell concept with less processing steps. The laser scribing process is set at the first step on raw mono-crystalline silicon wafer. And then the texturing etch; phosphorus diffusion and SiNx passivation process was needed once. While simultaneously optimizing the laser scribing process did to get better results on screen-printing process with fewer difficulties to fill the laser groove. This project has been done to make the whole production of buried contact solar cell with fewer steps and could present a cost effective opportunity to solar cell industries.<br><p>In collaboration with Institute for Photovoltaics <strong><em>IPV</em></strong>, University of Stuttgart.</p>
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Azariová, Viktória. "Tisk up-konverzních značek." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401917.
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The subject of this these is a preparation and printing of upconversion marks that have been printed by two printing techniques, namely screen printing and pad printing. The makrs were designed to visualize another chemical code identifiable by instrumentation. The impact of chemical code components on the fluorescence intensity of upconversion marks and the impact of individual components on printability and print sustainability were studied. The upconversion pigment was excited by NIR laser.
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Shaw, Philip T. "A study of vegetable sourced colourants for use in screen process ink production." Thesis, Middlesex University, 2000. http://eprints.mdx.ac.uk/10691/.
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The following investigation aims to determine the potential of plant material to produce pigments capable of acting as alternatives to the standard range of process (CMYK) colours used in screen printing. A review of the literature on so-called `natural dyes' reveals the extent of the pre-synthetic (1857) use of a range of dye-plants in the textile and related industries over a period of many centuries. Several plant sources are identified for investigation in the context of this study. Chemical, botanical and historical aspects of these plants are described along with notes on their cultivation and nomenclature. The necessary thickeners and other additives that may be required for the production of a stable ink formulation are also discussed. The establishment of the Cat Hill Ink Garden is described as well as a discussion of other sources of raw material supply. Methods of aqueous extraction, lake production, comparative light fastness and spectral reflectance testing are all described and test results are provided in appendix form. The environmental, economic and health and safety aspects of the new inks is contrasted with the commercial oil-based product as well as a brief discussion of their potential for commercial development. Printed examples by the author and several of his students form the final part of the study and demonstrate the use of both CMYK and other non-primary ink formulations.
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Martiniaková, Ivana. "Formulace inkoustů pro materiálový tisk chemických značek." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401918.
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This diploma theses is about the study of the effect of individual components of printing compositions intended for material printing of identificaton codes, read by X-ray fluorescence. Two printing technologies were used – screen printing and pad printing. The composition of the print compositions has been optimized in term of visual recognition, print repeatability, a dry matter content providing an X-ray fluorescence signal, as well as optimization of the material print process leading to the creation of invisible identification tags for archive documents.
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Latanision, Ivan M. "A comparison between the staggered position one-angle screening and the multi-angle screening method in terms of misregistration when printing process color on newsprint /." Online version of thesis, 1992. http://hdl.handle.net/1850/11251.
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Broman, Eva. "Printable Biosensors based on Organic Electrochemical Transistors with a Platinized Gate Electrode." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-87641.
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There is a great demand for low-cost disposable sensors in a variety of markets, such as the food chainand health care. No assay is performed more than that of glucose and approximately 85 % of the entirebiosensor market accounts for glucose biosensors. Each year, 6 billion glucose assays are performed andthe majority of them are based on electrochemical detection. Organic electrochemical transistors(OECTs) have favorable properties in terms of low operating voltages and have previously been used asbase for electrochemical detection of glucose. A low-cost disposable biosensor can be achieved by theuse of high throughput printing techniques. Up until now, no printable biosensors based on organic electrochemicaltransistors have been developed. In this thesis a printable miniaturized prototype for a glucose biosensor based on an OECT with a platinizedgate electrode has been designed, developed and evaluated. The biosensor has been functionalizedwith the enzyme glucose oxidase. Different platinum deposition techniques have been used to depositplatinum onto the printed carbon gate electrode: electrodeposition, platinum nanoparticle solutiondeposited either by inkjet printing or pipetting and thermal evaporation. The gate electrodes were characterized with cyclic voltammetry in hydrogen peroxide, ferricyanide andglucose. The characterizations revealed no significant differences between the different deposition techniques.However, with gate electrodes produced by printed carbon followed by electrodeposition ofplatinum it was possible to sense glucose in a concentration in the range of the values for diabetic persons.Thus, the electrodes are a promising option as gate electrodes in a glucose biosensor based on anOECT. The characteristics of the OECT revealed that the responses resembled a transistor.
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Haynes, Holly. "Production alternatives to screen printing for dye sensitized solar cells in laboratory settings." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3721.
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In this thesis, two methods of creating multi-layer porous films for DSSCs are examined. They have been designed as possible alternatives for screen printing in laboratory settings. The same precursor chemicals used for screen printing are employed in both the alternative methods, which are designated multi-layer doctor-blading and stamping. Both alternatives are simple and inexpensive, costing $0.86 and $0.89 per DSSC, respectively. Multi-layer doctor bladed cells can be made with up to three layers, while stamped cells can be made with up to eight.
The cells produced by these two methods are compared to a sample screen printed cell, with mixed results. The multi-layer doctor bladed cells exhibit lower current densities than a screen printed cell, 68.0 A/m2 compared to 68.9 A/m2. The best performing stamped cell demonstrates a higher current density than the screen printed reference, reaching 82.7 A/m2. It also has a slightly higher efficiency. However, the results from the stamped cells are inconsistent. In order for it to truly become an effective method for creating DSSCs in laboratory settings, the source of this variation must be found and standardized.<br>Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.
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Bartholomew, Anthony J. "Phillip Wall: Studies in Field Imagery Utilizing Screen Printing and Low Relief Techniques." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1208975444.
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Zhou, Dao Min. "An investigation of some electrochemical characteristics of enzyme based disposable biosensors and other relevant electrodes." Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242072.
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Pereira, de Siqueira Leonardo. "Desenvolvimento de um biossensor para determinação de triglicerídeos." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/1570.
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Made available in DSpace on 2014-06-12T15:51:13Z (GMT). No. of bitstreams: 2
arquivo1504_1.pdf: 791063 bytes, checksum: 4a11c48c67eb0f30d0a7814f389f14a4 (MD5)
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Previous issue date: 2009<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A necessidade de métodos mais versáteis para a mensuração e monitoramento dos
níveis séricos de lipídios tem estimulado a produção de uma grande variedade de novos
métodos analíticos. O presente trabalho mostra o desenvolvimento de um biossensor
monoenzimático para detecção de triglicerídeos empregando a tecnologia de Screenprinting
através da qual, foram impressos os eletrodos de referência (Ag/AgCl) e o de
trabalho contendo uma mistura de carbono e quitosana. A lipase foi imobilizada por
adsorção no eletrodo de trabalho. A lipase solúvel, usando pNPM, apresentou pH ótimo
de 8 e temperatura ótima de 32,5°C, mantendo cerca de 78,5% da atividade máxima a
25°C (temperatura operacional do biossensor). O Km e Vmáx para a lipase solúvel em
relação ao pNPM foram de 0,95 mM e 25,51 U/mg proteína, respectivamente. No
biossensor desenvolvido com apenas lipase imobilizada, usando trioleína como
substrato, foram de 0,148 mM e 262,21 μA/s e 0,304 mM e 85,07 μA/s para a lipase
solúvel e TIP sem enzima. Os resultados mostraram linearidade nas respostas de
correntes para trioleína (0,25mM 2mM), atestando a viabilidade do biossensor
desenvolvido, utilizando unicamente a lipase imobilizada na superfície do eletrodo de
trabalho, podendo ser empregado eficientemente para a detecção de triglicerídeos
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Specht, Heidi. "Legibility how precedents established in print impact on-screen and dynamic typography /." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1426.
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Thesis (M.F.A.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains iv, 25 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 23-25).
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Edwards, Matthew Bruce ARC Centre of Excellence in Advanced Silicon Photovoltaics & Photonics Faculty of Engineering UNSW. "Screen and stencil print technologies for industrial N-type silicon solar cells." Publisher:University of New South Wales. ARC Centre of Excellence in Advanced Silicon Photovoltaics & Photonics, 2008. http://handle.unsw.edu.au/1959.4/41372.
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To ensure that photovoltaics contributes significantly to future world energy production, the cost per watt of producing solar cells needs to be drastically reduced. The use of n-type silicon wafers in conjunction with industrial print technology has the potential to lower the cost per watt of solar cells. The use of n-type silicon is expected to allow the use of cheaper Cz substrates, without a corresponding loss in device efficiency. Printed metallisation is well utilised by the PV industry due to its low cost, yet there are few examples of its application to n-type solar cells. This thesis explores the use of n-type Cz silicon with printed metallisation and diffusion from printed sources in creating industrially applicable solar cell structures. The thesis begins with an overview of existing n-type solar cell structures, previous printed thick film metallisation research and previous research into printed dopant sources. A study of printed thick-film metallisation for n-type solar cells is then presented, which details the fabrication of boron doped p-type emitters followed by a survey of thick film Ag, Al, and Ag/Al inks for making contact to a p-emitter layer. Drawbacks of the various inks include high contact resistance, low metal conductivity or both. A cofire regime for front and rear contacts is established and an optimal emitter selected. A study of printed dopant pastes is presented, with an objective to achieve selective, heavily doped regions under metal contacts without significantly compromising minority carrier lifetime in solar cells. It is found that heavily doped regions are achievable with both boron and phosphorus, but that only phosphorus paste was capable of post-processing lifetime compatible with good efficiencies. The effect of belt furnace processing on n-type silicon wafers is explored, with large losses in implied voltage observed due to contamination of Si wafers from transition metals present in the belt furnace. Due to exposure to chromium in the belt furnace, no significant advantage in using n-type wafers instead of p-type is observed during the belt furnace processing step. Finally, working solar cells with efficiencies up to 16.1% are fabricated utilising knowledge acquired in the earlier chapters. The solar cells are characterised using several new photoluminescence techniques, including photoluminescence with current extraction to measure the quality of metal contacts. The work in this thesis indicates that n-type printed silicon solar cell technology shows potential for good performance at low cost.
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Patton, D. A. "Motivations that underpin environmental responses in business : the case of the screen-printing sector." Thesis, De Montfort University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391995.
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Sullivan, Emily. "Dystopia." [Kent, Ohio] : Kent State University, 2010. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1272398862.
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Thesis (M.F.A.)--Kent State University, 2010.<br>Title from PDF t.p. (viewed May 26, 2010). Advisor: Loderstedt Michael. Keywords: printmaking; screen printing; photography; installation Includes bibliographical references (p. 21).
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Gao, Xiangming. "Novel electrochemical methods for acidity monitoring : theory, design and application." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289710.
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This thesis reports the design and development of novel voltammetric pH sensors for buffered, low-buffered and unbuffered media. pH sensors in stagnant and hydrodynamic environments were designed and developed for performing measurements using square wave voltammetry. Chapter 1 introduces the motivation of this project, the current development of electrochemical sensors, and the basic theory and techniques of electrochemistry concerned within the thesis. The existing development of carbon-based electrochemical sensors and the application of screen-printing technology in sensor fabrication are highlighted. Chapter 2 introduces the screen-printing technology and the fundamental methods of numerical simulation. In addition, reagents, equipment and software packages used in the thesis are listed in this chapter. In Chapter 3, a novel design of quinone derivative-based pH probes is presented for the application in stagnant weakly buffered media (< 1mM), based on previous studies of quinone compounds in buffered media. The results from the weakly buffered system is consistent with the results in buffered systems. To further extend the application of this design in unbuffered media, a numerical model of a pH-sensitive redox particle immobilised on an electrode was developed, which predicted that the accumulation of hydrogen ions near the electrode is the possible limiting factor for the performance of this design in unbuffered media. To develop a pH-monitoring technology for unbuffered media, Chapter 4 reports on the design, fabrication and testing of different electropolymerised-phenol derivative modified electrodes, which overcome the limitation of hydrogen ions accumulation. The results revealed that 2-(methylthio)phenol graphite resin electrodes have high accuracy (ca. 1% error) in unbuffered media, benchmarked by a commercial glass pH meter. This is the first detailed study on the v application of the economical and scalable technology in pH sensing in unbuffered environment. Chapter 5 presents a unique design of electrochemical pH sensors, free from the need to use a glass reference electrode. This design integrates a pH indicator and an internal reference electrode. Different designs of ferrocene screen-printed electrodes were tested as the internal reference electrode. The nafion-coated ferrocene screen-printed electrode showed stable peak potential in a wide pH range (pH 1 - 12) with good durability (stable in 500+ cycles of test). It was then cross connected with an alizarin electrode, forming the pH sensor free from a glass reference electrode. Chapter 6 describes novel designs of hydrodynamic pH sensors. The design of a microfluidic pH sensor modified by poly-sodium salicylate was firstly demonstrated. The sensor showed a Nernstian response in a wide pH range and, in hydrodynamic conditions, provided improved accuracy in unbuffered media compared to the stagnant state. For more convenient measurements, a novel rocking disc electrode was studied for pH sensing, modified with alizarin and poly-salicylic acid as pH indicators. The electrodes modified by both chemicals showed a Nernstian response in buffered media and the highest accuracy in unbuffered media was reached at 50 rpm.
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Ramos, Carina Alexandra Rebelo. "Potential of CPV receivers integrating screen-printed solar cells." Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/11020.
Full textAbstract:
Dissertação para obtenção do Grau de Mestre em
Energias Renováveis – Conversão Eléctrica e Utilização Sustentável<br>Photovoltaic systems present themselves as an excellent alternative for clean energy production.
To reach large applications, obstructions as high silicon prices must be overcome. Solar concentration systems are a potential solution since silicon is replaced by cheaper material (like mirrors or lenses).
Nevertheless, there are still many issues and challenges yet to overcome. One of these challenges is the economic cost of the solar cells, since the CPV systems need to integrate expensive high efficiency solar
cells specially designed to operate at high levels of radiation. Thus, it is necessary to explore new approaches.
In this thesis presents a study of the potential of the screen-printed silicon solar cells to integrate the CPV systems, concretely the HSUN system. Two solar cells, conventional 1Sun and conventional 15Suns, were analyzed and integrated in the HSUN sub-receivers, in order to understand their behavior under several levels of concentration and when integrated in series in sub-receivers. After the first part
of the experimental campaign (electrical characterization of solar cells) it was concluded that the conventional standard silicon solar cells are unsustainable for use in the HSUN system (which operates
a 15 suns), since these solar cells only work properly up to a concentration of 5 suns. Regarding the Upgraded 1-sun silicon solar cells, the results were satisfactory regarding their behavior under
concentration, until a concentration level of 20 suns.
In the second part of the experimental campaign, the Upgraded 1-sun solar cells were integrated in the HSUN sub-receivers and their behavior was analyzed. The results taking from this part of the experimental campaign prove the good performance of the Upgraded solar cells and that their
performance is unaffected by their integration in the sub-receivers. Associated to this part of the experiments, was also performed the optimization of the mounting process of the sub-receivers. This
optimization provided a faster process with a lower probability of damaging the solar cells. To a complete study of the potential of these solar cells, it is important to take into account the economic viability of the solar cells. Comparing the cost-efficiency of the standard conventional solar cells, the LGBC solar cells (cells used actually in the HSUN system) and the Upgraded 1-sun solar cells, it was
concluded that the solar cells more viable up to a concentration level of 24 suns are the Upgraded 1-sun solar cells, being that from this concentration level the LGBC solar cells solar cells present themselves as the most viable.
Therefore, and taking into account all the work developed along this thesis, it was concluded that the most cost-efficient solar cells to integrate the HSUN system are the conventional solar cells with some characteristics optimized for the required concentration levels.
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Rodriguez, German Dario. "Analysis of the solder paste release in fine pitch stencil printing processes." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18867.
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Brisar, Jon David. "Light emitting polymers on flexible substrates for Naval Firefighting applications /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FBrisar.pdf.
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Fritz, Susanne [Verfasser]. "Contact Formation of Ag/Al Screen-Printing Pastes to Heavily B-Doped c-Si / Susanne Fritz." Konstanz : Bibliothek der Universität Konstanz, 2016. http://d-nb.info/1115667432/34.
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De, Silva Kandaudage Channa R. "Effect of Manufacturing Technique on Electrochemical Response of a Sulfur Tolerant Planar Solid Oxide Fuel Cell Anode." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1225992967.
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Mell, Michael M. "A tutorial in frequency modulation screening technology for lithography /." Online version of thesis, 1994. http://hdl.handle.net/1850/12194.
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TSAI, PEI-LING, and 蔡沛霖. "Application Analysis of Screen Printing Halftone Screen." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d9659r.
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碩士<br>國立臺北科技大學<br>分子科學與工程系紡織技術及國際行銷產業碩士專班<br>107<br>The purpose of this study is to explore the analysis of the number of computer software for color-removal screen printing。With the change of fashion and the innovation of technology，the screen printing has been able to complete colorful photo printing from simple monochrome printing。The prepress work of printing is also closely related to the innovation of computer software。In this study，the color image was dissected for color image analysis，and the color of the drawing software was disassembled，and the number of meshes was divided into 65 lines，75 lines，and 85 lines，respectively，and the hand feeling and color performance were used as analysis and consumption。The client，the vendor，and the designer discuss separately。At the same time，analyze the most suitable color-removal data for the printing industry as a reference，and accelerate the combination of the fashion industry and the printing of traditional industries。At the end of the study，the three directions of the screen printing were summarized，which are: halftone screen data induction，computer color removal rules for spot color printing，printed hand feeling analysis and traditional printing and spot color printing market acceptance。
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TSAI, CHIEN-HUI, and 蔡芊慧. "A Study of Introducing Cloud Printing into Screen Printing." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/z8re5f.
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碩士<br>國立臺灣藝術大學<br>圖文傳播藝術學系<br>105<br>“Cloud Printing” has extended from the web-to-print, and has become a new trend of printing industry all over the world since 2007. Cloud Printing is commercial activities for trading of printing products or service through the internet. Most of Asian screen printers still use traditional processes to print orders. Comparing to the printers in U.S. or Europe countries, these screen printers in Taiwan seem not so active in the development of Cloud Printing. Under the influence of digitalization, it will be very important for them to pay attention how to provide Cloud Printing service. To understand the needs, key elements, criteria, and necessity of a profitable customized Cloud Printing platform, this study conducted content analyses on major successful cloud printing service websites in different countries and Taiwan, in addition to qualitative approaches, a questionnaire survey on Taiwanese screen printers and customers was conducted to fulfill the objectives of the study. To explore how Taiwanese screen printers and consumers view the must-have requirements and understand the bottlenecks and difficulties encountered for Taiwanese screen printers, and to comprehend the web structure and important functional items in the process of establishing and maintaining a personalized Cloud Printing platform. This study disclosed Taiwanese screen printers need more online sofware technology and knowledge in the development of Cloud Printing, and provide consumers with the information about how to use the design editor help consumers easy to create and print the personalized products. Hope this study will elevate competitiveness of traditional screen printing enterprise and create maximal utility for the conventional screen printers, and help screen printing enterprise develop a successful me-commerce Cloud Printing platform usefully for consumers.
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Hung, Chao-Chi, and 洪兆騏. "The Conductive Ink Usage of RFID Tag Printing by Screen Printing." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/44495891990875959276.
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碩士<br>世新大學<br>圖文傳播暨數位出版學研究所(含碩專班)<br>103<br>Printing industry is enhanced to the production and service industries.
The use of advanced printing technology gives new life to RFID technology to
force the printing industry and the electronics industry more closely together.
This makes the RFID tags to printers, printing materials and equipment
suppliers to raise the new demand. In the mean time, it also opens a new product
line, a new profit growth and new markets.
Because the passive RFID tag printing of "conductive ink" when its printed
materials need to use the high price of silver. This leads the RDIF tag cannot
reduce the cost. This study used true-experimental research method by using
the screen printing. The different size of the halftone dots is used to adjust
the amount of conductive ink to save the amount of conductive ink reach RFID
tags cost down. But still maintain the communication effectiveness of RFID,
and then further accelerate the market development of RFID tags.
The experiment used the different printing resolutions, different papers
and different halftone dot sizes (dots and dots must be connected without
breaking). After screen printing is completed, put the strap IC chip onto the
RFID tags and measure the effective distance of the RFID tag. The results of
the research: is smaller print resolution, the higher the amount of conductive
ink; the larger the print halftone dot size (the closer to the line art) the
better reading distance. However, the amount of ink and use the reading
distance must find its place point. The saving of the ink becomes meaningful
and significant. Therefore, we do believe that by changing the halftone dot
size is a feasible solution and the cost of the RFID tag can be reduced.
Furthermore, by using the same RFID antenna design, the use of different dot
sizes should be have different distances of the RFID tag for the different
end applications.
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Reikalaite, Ieva Marija. "Screen printing: roots and meaning in contemporary culture." Master's thesis, 2017. http://hdl.handle.net/10400.26/19913.
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A serigrafia é uma técnica de impressão que permanece praticamente inalterada desde os seus primórdios, com apenas ligeiras melhorias, e que está a renascer em diversos movimentos na cultura contemporânea. A pesquisa que se segue examina a história, estilos e técnicas da serigrafia, procura as razões pelas quais sobreviveu e porque é ainda utilizada como técnica de impressão até aos dias de hoje. Nesta linha, vários impressores e designers contemporâneos, bem como admiradores da técnica, são entrevistados. A serigrafia é ainda comparada a outros recentes ressurgimentos analógicos e aplicada na prática, sendo documentados todos os processos de aprendizagem e experimentação, e conclui com a sua produção e materialização na forma de um cartaz.<br>Screen-printing is a printmaking technique, which exists in almost original form since ancient times just with a few improvements and is having a revival In contemporary culture. This research examines history, styles, techniques of screen-printing and searches for reasons why it survived and is still used as a printmaking technique until nowadays. Due to find out, a number of contemporary printmakers and screen-printing admirers is interviewed. Afterwards screen-printing is compared to other recent analogue revivals and employed in practice documenting all the learning and experimentation processes and before the conclusion producing a final material result in form of a poster.
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LIOU, JHE-HONG, and 劉哲宏. "A Study Of Screen Printing Composite Structure Improvement." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38880942787300396227.
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碩士<br>世新大學<br>圖文傳播暨數位出版學研究所(含碩專班)<br>104<br>Screen printing is no longer the industry with relative backward technologies. With the developments of the modern technologies, screen printing has become one of the major production processes in 3C products, especially on the circuit printing. However, due to the unfamiliar with screen printing’s variables, people blames on it while problems occurs during the printing production. The problems always caused by user try to change screen variables in the low-cost situation that makes screen manufacture difficult to maintain quality. Those changes even violate basic Screen printing restrictions that want to improve the productivity and precision often futile. This study is focus on the improvement of the composite screen structure to produce more accurate and stable screen tension. And result a better quality and more accurate screen printing results.
According to the study results, polygonal composite web version produced better tension quality than the general square composite web version. The polygonal composite web break itself the mesh tension limit and shorten the net in time, improve the stability of the net in time to save break mesh screen costs. It also maintains tension for longer time. The higher path accuracy and enhance yield.
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Lin, Wan-Hsuan, and 林宛萱. "Electromigration Behavior of Screen-Printing Ag nanoparticles Interconnects." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/tsa3mz.
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