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The 7th German-Japanese Bridge Symposium, July 30-August 1, 2007 Osaka, JAPAN (GJBS07)

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The aim of the thesis is to propose the use of waste materials as filler for the selected coating systems used for chemical protection of concrete surfaces.The used filler could not affect the existing binder of the coating system. Research was conducted using two materials N141 and N 121. The waste material was chosen by his chemical and physical properties. Between suitable materials belongs slag, fly ash, foundry sand and glass waste. The selection based on Lena Chemical s.r.o companies request was selected glass waste. The practical part includes examination as fillers, and the corresponding tests for coating systems with pre-used filler. Finally, the assessment of the suitability of the materials used.

No description available.

No description available.

A sobrevivência das organizações em cenários altamente competitivos tem exigido a melhoria da eficiência, flexibilidade e qualidade dos sistemas de produção (DE RON, 1998). Neste âmbito, a programação de tarefas assume grande responsabilidade ao suportar o planejamento e controle da manufatura, garantindo que estes processos estejam alinhados com os objetivos estratégicos das organizações. Esta dissertação aborda a programação de tarefas em sistemas de pintura com tempos de setup dependentes da sequência do processamento. No primeiro artigo é proposta uma sistemática para liberação do tamanho de lote que minimiza a soma dos custos de setup e pintura. Na sequência, os lotes liberados são sequenciados utilizando as regras Apparent Tardiness Cost (ATC) e Apparent Tardiness Cost with Setups (ATCS). Quando aplicado em processo de pintura, o ganho de eficiência da instalação medido através do Overall Equipment Effectiveness (OEE) foi de 32,84%. O segundo artigo propõe uma modificação na regra ATCS através da inclusão de um parâmetro relativo à qualidade de execução do procedimento de pintura. Tal parâmetro é justificado pelo impacto decorrente de falhas no processo de pintura, gerando atrasos de entrega. Esta nova heurística, quando aplicada no mesmo processo de pintura, elevou o OEE em 2,74%, a precisão de entrega em 2,11% e o percentual de embalagens completas ao final do processo de pintura em 8%. / The competitive industrial scenarios required companies to improve efficiency, flexibility and quality of production systems (RON, 1998). In this context, job scheduling is deemed important to support planning and control of manufacturing systems. This dissertation addresses the scheduling problem in painting systems where setups depend on the job sequence. The first paper proposes an approach to release batches aimed at minimizing the sum of setup and painting costs. The released lots are scheduled using the Apparent Tardiness Cost (ATC) and Apparent Tardiness Cost with Setups (ATCS) rules. When applied to a painting process, the proposed approach increased efficiency measured by the Overall Equipment Effectiveness 32.84%. The second article proposes a modification to the ATCS rule by including a quality related parameter. This parameter is tailored to reduce delivery delays due to quality problems. This new heuristic, when applied to the same painting process, increased the OEE 2.74%, the delivery accuracy 2.11% and the percentage of completed packages at the end of the painting process 8%.

A sobrevivência das organizações em cenários altamente competitivos tem exigido a melhoria da eficiência, flexibilidade e qualidade dos sistemas de produção (DE RON, 1998). Neste âmbito, a programação de tarefas assume grande responsabilidade ao suportar o planejamento e controle da manufatura, garantindo que estes processos estejam alinhados com os objetivos estratégicos das organizações. Esta dissertação aborda a programação de tarefas em sistemas de pintura com tempos de setup dependentes da sequência do processamento. No primeiro artigo é proposta uma sistemática para liberação do tamanho de lote que minimiza a soma dos custos de setup e pintura. Na sequência, os lotes liberados são sequenciados utilizando as regras Apparent Tardiness Cost (ATC) e Apparent Tardiness Cost with Setups (ATCS). Quando aplicado em processo de pintura, o ganho de eficiência da instalação medido através do Overall Equipment Effectiveness (OEE) foi de 32,84%. O segundo artigo propõe uma modificação na regra ATCS através da inclusão de um parâmetro relativo à qualidade de execução do procedimento de pintura. Tal parâmetro é justificado pelo impacto decorrente de falhas no processo de pintura, gerando atrasos de entrega. Esta nova heurística, quando aplicada no mesmo processo de pintura, elevou o OEE em 2,74%, a precisão de entrega em 2,11% e o percentual de embalagens completas ao final do processo de pintura em 8%. / The competitive industrial scenarios required companies to improve efficiency, flexibility and quality of production systems (RON, 1998). In this context, job scheduling is deemed important to support planning and control of manufacturing systems. This dissertation addresses the scheduling problem in painting systems where setups depend on the job sequence. The first paper proposes an approach to release batches aimed at minimizing the sum of setup and painting costs. The released lots are scheduled using the Apparent Tardiness Cost (ATC) and Apparent Tardiness Cost with Setups (ATCS) rules. When applied to a painting process, the proposed approach increased efficiency measured by the Overall Equipment Effectiveness 32.84%. The second article proposes a modification to the ATCS rule by including a quality related parameter. This parameter is tailored to reduce delivery delays due to quality problems. This new heuristic, when applied to the same painting process, increased the OEE 2.74%, the delivery accuracy 2.11% and the percentage of completed packages at the end of the painting process 8%.

A sobrevivência das organizações em cenários altamente competitivos tem exigido a melhoria da eficiência, flexibilidade e qualidade dos sistemas de produção (DE RON, 1998). Neste âmbito, a programação de tarefas assume grande responsabilidade ao suportar o planejamento e controle da manufatura, garantindo que estes processos estejam alinhados com os objetivos estratégicos das organizações. Esta dissertação aborda a programação de tarefas em sistemas de pintura com tempos de setup dependentes da sequência do processamento. No primeiro artigo é proposta uma sistemática para liberação do tamanho de lote que minimiza a soma dos custos de setup e pintura. Na sequência, os lotes liberados são sequenciados utilizando as regras Apparent Tardiness Cost (ATC) e Apparent Tardiness Cost with Setups (ATCS). Quando aplicado em processo de pintura, o ganho de eficiência da instalação medido através do Overall Equipment Effectiveness (OEE) foi de 32,84%. O segundo artigo propõe uma modificação na regra ATCS através da inclusão de um parâmetro relativo à qualidade de execução do procedimento de pintura. Tal parâmetro é justificado pelo impacto decorrente de falhas no processo de pintura, gerando atrasos de entrega. Esta nova heurística, quando aplicada no mesmo processo de pintura, elevou o OEE em 2,74%, a precisão de entrega em 2,11% e o percentual de embalagens completas ao final do processo de pintura em 8%. / The competitive industrial scenarios required companies to improve efficiency, flexibility and quality of production systems (RON, 1998). In this context, job scheduling is deemed important to support planning and control of manufacturing systems. This dissertation addresses the scheduling problem in painting systems where setups depend on the job sequence. The first paper proposes an approach to release batches aimed at minimizing the sum of setup and painting costs. The released lots are scheduled using the Apparent Tardiness Cost (ATC) and Apparent Tardiness Cost with Setups (ATCS) rules. When applied to a painting process, the proposed approach increased efficiency measured by the Overall Equipment Effectiveness 32.84%. The second article proposes a modification to the ATCS rule by including a quality related parameter. This parameter is tailored to reduce delivery delays due to quality problems. This new heuristic, when applied to the same painting process, increased the OEE 2.74%, the delivery accuracy 2.11% and the percentage of completed packages at the end of the painting process 8%.

In modern research and industrial applications, the importance of coatings can hardly be underestimated. Coatings are used extensively in optics, biomedical instruments, cutting tools, and solar panels to name a few. The primary purpose of any coating is to alter surface properties of the base material thus adding new functionality or improving the performance of the original product. A multitude of coating techniques has evolved over the years with spray coating being one of the more widely used. Some applications require deposition of materials that are either in the form of a solution or suspension. Therefore, before or during the deposition process small droplets of the said liquid are formed and transferred onto the substrate. Since differently sized droplets have different surface impact dynamics, droplet velocity at the impact plays an important role in the way it will adhere to the surface. Most spray coating techniques do not take into account the process of droplet-surface interaction which may result in overspray, poor coating thickness control, and material waste. The research presented in this dissertation outlines the supporting principles, design, fabrication and testing of an innovative spray coating system that provides the ability to fine tune coating parameters, including droplet impact velocities, to provide close to optimum deposition conditions. The core of the design consist of a dual velocity nozzle unit that ensures acceptable range of droplet velocities at the surface, while keeping droplets from accelerating excessively inside the system. Early experiments showed the system’s potential to produce nanoparticle coatings with particles uniformly distributed across the substrate. In addition, pigment coating for improved 3D scanning was also performed, thereby improving the surface definition and accuracy of the scanning results. Scalability of the system also led to experiments in applying this technology to microprinting. Preliminary microprinting results illustrated the system’s flexibility and opened new research avenues in micro-coating, microprinting, and, possibly rapid prototyping. Furthermore, thanks to the highly adaptable nature of the proposed design, seamless incorporation of a torch-like device into the nozzle unit was also possible. That provided the opportunity to perform in situ thermal processing or sintering of deposited material as well as production of a nanoparticle coating in a one-step process by thermally decomposing precursor solution. Technology developed during the research work presented in this dissertation demonstrated its ability to be adapted in a number of applications that can benefit both industry and engineering research alike. Large area coatings, nanoparticle production, micro-coating, and coatings for improved 3D scanning are just a few areas where the presented technique can already, or may, if developed further, outperform existing and widely accepted methods. Fine tuning of the system to a particular application, and tapping into its potential in other fields will be explored in future research. / Graduate