Determinação do intervalo de tolerâncias dos testes de permeabilidade de filme semiacabado de uma indústria de embalagens flexíveis

Abstract

This final course project aims to determine the tolerance interval for permeability tests of semi-finished films used in the flexible packaging industry. The research was conducted to establish parameters to guarantee the quality and efficiency of products at the first stage of the process, contributing to the continuous improvement of production processes. The methodology adopted included the analysis of different film samples and the performance of water vapor and oxygen permeability tests to determine the tolerance interval with 95% confidence for subsequent process control evaluation. Twelve types of samples were analyzed, presenting characteristics such as high barrier, no barrier, and antifog additive. To obtain a good result, the confidence percentage achieved should be close to its determined confidence level. When analyzing the results calculated by the normal and non-parametric methods, they were not effective due to the sample size and low standard deviations. The confidence achieved for the low sample structures resulted in the lowest confidence percentage. However, to ensure the functionality of quality control tests for the structures and continue monitoring the process, it is recommended to implement a new, larger sample size to ensure the viability of the results.