PENGENDALIAN KUALITAS BAHAN BAKU DAN PRODUK TEH HITAM DI PT PAGILARAN, BATANG

Abstract

The quality of final product of tea is determined by its material and process. Low percentage of damaged fresh tea leaves produced first grade of final product of tea and high percentage of damaged fresh tea leaves produced the reddish tea. In addition, implementation of standardized process ensures high quality of product then it is important to control every stage of production process: material holding, processing in the factory, and assessing the quality of final product. Statistical Quality Control (SQC) method, using Control Chart, may be used to observe the quality fluctuation of raw material, material in process, and final product. The objective of this research was to study the statistical quality control in material, process, and final productof black tea. The research formed as a case study which was done in PT Pagilaran, Batang Regency. Data used in this case study were the percentage of damaged tealeaves, degree of wilting during the process, water content, and density in final product of black tea measured in year 2013. The data were captured monthly and annualy. The 3-sigma control chart showed stastically an upper control limit value and a lower control limit value of each parameter. The results showed that in year 2013, the mean of percentage of damaged tea leaves was 11,28% and while the degree of wilting in PT Pagilaran was 41,57%. The percentage of damaged tea leaves and degree of wilting were out of statistical quality control but they were in the company�s spesification, in which the maximum percentage of damaged tea leaves was 13%, and degree of wilting was about 41%-42%. The water content of BOP, BOPF, PF, Dust, PF2, Dust 2 measured in year 2013 lay in statistical quality control and matched with company�s spesification but Bohea was out of statistical quality control. The density of BOP, BOPF, PF, PF2 and Dust 2 measured in year 2013 was in statistical quality control but Dust and Bohea were out of statistical quality control. The density of each grade was not in company�s spesification