STATISTICAL CONTROL OF A MULTIPLE-STREAM PROCESS WITH VARIABLE MEANS / CONTROLE ESTATÍSTICO DE UM PROCESSO MULTICANAL COM MÉDIAS VARIÁVEIS

AUTOR(ES)

ITALO PARENTE DE BARROS

DATA DE PUBLICAÇÃO

2008

RESUMO

This study shows the implantation of techniques of Statistical Process Control (SPC) in a cosmetics industry, in a situation in which conventional techniques are not applicable. The process to be controlled is composed of eight streams, which produce eight units of the product at a time. The process has the peculiarity that the means of the streams change in time, even in a condition of statistical control. The control schemes proposed in the literature hitherto for multiple-stream processes assume constant means, and streams with similar means and variance, and are therefore not applicable to this process. A new scheme was then developed for the statistical control of the process, which blends the principles of the group charts and of acceptance control charts. A review was also presented of some techniques of statistical control of multiple-stream processes, including traditional and more recent methods.

ASSUNTO(S)

graficos de controle controle estatistico de processos statistical process control control charts medias variaveis multi-channel processes processos multi-canal group control charts graficos de controle agrupados variable means

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