Penerapan Metode Peta Kendali untuk Pengendalian Kualitas Biji Plastik Daur Ulang di PT Peka Cipta Kembali

Penerapan Metode Peta

Abstract

Quality control is essential to ensure that products meet established standards, including recycled plastic pellets produced by PT Peka Cipta Kembali. However, the company faces challenges in the form of product returns from customers. This study aims to examine the quality control process of recycled plastic pellets at PT Peka Cipta Kembali, evaluate the application of p-control chart methods, and identify the factors causing quality variation. Data were obtained through observation, interviews, and documentation. The results show that quality inspection at the company in on carried out during the production process and not yet on the final product. The application of the p-control chart method to clear PP plastik pellets found color inconsistency defects (0%, capable process), contamination defects (100%, incapable process), curled caut defects with 47 cases (8 points outside the UCL, incapable process), and bubble defects with 2.287 cases (3 points outside the UCl, incapable process). In addition, special patterns within control limits were observed, namely consecutive points on the same side of the center line in curled cut and bubble defects. Factors causing variation include worker inaccurancy, manually controlled cooling water temperature, contaminated raw materials, dirty screen mesh, humidity, and others. Thus, this study recommends improvements in product quality to enchance consistency and standardization.