Analisis Pengendalian Kualitas Produk Pellet Dengan Metode Statistical Quality Control (SQC) Dan Statistical Prosess Control (SPC) Di PT.Gold Coin Indonesia Kim II Mabar

Abstract

PT. Gold Coin Indonesia KIM II Mabar, Medan-Belawan, North Sumatra is a company engaged in animal feed production. One of the products is pellet. In the production activity, the company always face the problems related to the product quality produced resulting from the lack of attention in machine maintenance and supervision in the production activity process stage. This matter is the reason for the company to always do the evaluation and look for the cause of product quality decrease. Statistical Quality Control (SQC) and Statistical Process Control (SPC) Methods are one of the analysis methods which function to analyze the cause of defects occurred, both in product quality and production process quality. The aim of the two methods is to find out the cause of product quality decrease so it will increase the product performance and quality produced. Through the SQC method, the result showed that there was data in out of control limit; those were on day 3, 4, 7, 9, 10, 13, 14, 18, 21 and from the data obtained by the biggest out of control was on day 4 of 0.017357; day 7 of 0.016973; day 9 of 0.017508. Whereas, through the SPC method, it was found that there were several processes on the high level of defect processes such as the mixing process of 24%, spraying process of 20%, and granulation process of 14%. Based on the highest defect process percentage conducted an analysis through 5W + 1 H method, it was obtained some causal factors of the defects namely human factor, negligence in working; machine factor, the engine crashed as the blade broken because of the old age of use, mixer machine crashed because of the loose machine components; raw materials factor, the raw material can not be mixed since it was too coarse; method factor, the uncleaned mixing process area, and the power failure caused the production process stopped