Article Per Year (5 Year)
p-Index From 2020 - 2025
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This Author published in this journals
All Journal International Journal of Indonesian Business Review
Siddik, Khairul
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Decision Sciences, Operations Research & Management Economics, Econometrics & Finance

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Quality Control Analysis to Reduce Rejects in Plastic Seal Manufacturing Siddik, Khairul; Nugroho, Rosalendro Eddy
International Journal of Indonesian Business Review Vol. 4 No. 2 (2025)
Publisher : Asosiasi Dosen Peneliti Ilmu Ekonomi dan Bisnis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54099/ijibr.v4i2.1513

Abstract

Purpose – This study aims to identify the root causes of product rejects and evaluate the effectiveness of quality control improvements at PT Karya Gemilang Indonusa, a plastic seal manufacturing company. Methodology – The methodology used includes Statistical Process Control (SPC), especially p-chart to monitor defect proportion, and Fishbone Diagram for root cause analysis. Data were collected from production reports between January and December 2024 and after improvements in January–April 2025. Findings – The study revealed that flashing and short mold are the dominant defects, accounting for more than 55% of total rejects. After corrective actions such as operator training, machine maintenance, and parameter adjustments, the reject rate reduced from 12.91% to 4.48%, and the process capability index (Cpk) improved from 0.333 to 0.667. Novelty – The integration of SPC and Fishbone Diagram in a real-world manufacturing setting effectively reduced rejects and increased process stability, supporting sustainable production.
Co-Authors Rosalendro Eddy Nugroho