Controle estatístico de processo aplicado no monitoramento da absorção de água por carcaças de frango durante a etapa de pré-resfriamento

• Autor(a) principal: Rusciolelli, Luciano Bertollo
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/1253
• topic: Pre-cooling of chicken carcasses; Water absorption; Statistical process control; Pré-resfriamento de carcaças de frango; Absorção de água; Controle estatístico de processo; Ciência e Tecnologia de Alimentos; Indústria avícola; 664

The water absorption by the chicken carcasses of pre-cooling step is an important quality characteristic related to the yield of the final product. One way to maintain the standard of quality of a product is to ensure that the process steps are stable and replicable. By employing the Statistical Process Control (SPC) is possible to obtain stability and improvements in processes, by reducing the variability. In this context, the aim of this work was the application of control charts, correlation analysis, descriptive statistics, hypothesis tests and multiple linear regression on the slaughter line of a poultry abattoir fridge to monitor the variability of absorption of water by the chicken carcasses after pre-cooling step. As a result, it was found that the amount of water absorption of the chicken carcasses showed high variability, with 10% (8/80) of carcasses showed water absorption higher than the 8% threshold set by Brazilian legislation. Of the total of 16 input variables analyzed, the most impactful content in water absorption were the "retention time of casting the pre-chiller" and "timeout carcass after step drip". However, the regression model obtained showed low correlation (R²=0.16) that was associated with the high variability of the response variable. The results of descriptive statistics demonstrated that the input variables also showed high variability, with coefficients of variation between 7.95 and 63.5%. It was found by analysis of control charts for individual measurement and moving range, that 15 of the 16 input variables were outside of statistical control as well as the response variable. Based on the flow chart and description of the steps of the slaughter line, previously performed, was attributed to the lack of standardization in the management of the steps and procedures for quality control operations in the slaughter line as relevant factors that could be associated with the presence special causes in the process. It is concluded that to reduce the high variability of the variables and eliminate the special causes present operational adjustments are necessary to, this way, obtain a more stable and more uniform process, ensuring the standard of quality of chicken carcasses when related to the water absorption content.