Engenharia Química
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Relatório de Estágio Acesso aberto Avaliação da viscosidade do detergente lava-louças a partir da utilização do controle estatístico de processo(2017) Campos, Karoline Mendes deDishwashing detergents are chemical products, used for surface cleaning, and may be for home or industrial use. Together with pH and dirt removal power, detergent viscosity is one of the important quality parameters and needs to be controlled in the production process. Due to the high levels of consumer complaints regarding consistency, related to low viscosity of the detergent, the parameter was evaluated from the application of Statistical Process Control, using three statistical tools. Eight samples of batches were collected related to the production of a period of three months, using the same raw materials from the same suppliers. After that, the data treatment was performed with the construction of a control chart of the individual type and mobile range, dispersion diagram and cause and effect diagram. Through these tools, it was possible to identify the variability of the kinematic viscosity of these samples, demonstrating the necessity of a more effective control of this parameter to evaluate the quality of the dishwasher detergent. Thus, a study of the detergent production process was carried out and the possible causes of variability during the period evaluated were observed. Subsequently, the results were compared to the average viscosity of commercially available detergents, where the viscosity limits of the current process were reassessed, re-specifying them to suit the product at values of at least 674 and at most 791 cP. The determined value, according to the Normative Resolution indicates that the limits exceeded the values that Normative Resolution 1/78 indicates as concentrated and super concentrated. Therefore, it is intended to meet the needs of consumers, taking into account a quality standard of high acceptability.