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All Journal Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Wisnu Pambudi
Department of Plastic and Rubber Processing Technology, Politeknik ATK Yogyakarta, 55188, Special Distric of Yogyakarta, Indonesia

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PERFORMANCE EFFECTIVENESS OF WOOJIN 170 T AND LS 170 T INJECTION MOLDING MACHINES IN 1.14 INCH HOLDER PRODUCTION: ANALYSIS OF OVERALL EQUIPMENT EFFECTIVENESS (OEE) AT PT. XYZ Wisnu Pambudi; Dewi Kumala
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 23 No. 1 (2024): Berkala Penelitian Kulit, Sepatu, dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/72qpyg92

Abstract

The challenges with Woojin 170 T and LS 170 T injection molding machines manifest in a decline in effectiveness, adversely impacting the final product. This research aims to measure the effectiveness of both machines using the Overall Equipment Effectiveness (OEE) method. Measurement results reveal that the LS 170 T injection machine achieved the highest OEE, reaching 89.3%, in the first week, with an average OEE value of 84.5%. In contrast, the Woojin 170 T injection machine only achieved 83.5% in the fourth week, falling below the 85% standard, with an average OEE value of 69.2%. The OEE value of the Woojin 170 T injection machine is significantly lower than that of the LS 170 T, indicating substantial inadequacy, far below the established standards. Factors influencing machine effectiveness are identified in two key aspects: equipment failure at a percentage of 66.9% and reduce speed at a percentage of 21.5%. The causes of the low effectiveness of the Woojin 170 T injection machine are attributed to factors involving machine, method, material, and environmental aspects.
THE EFFECT OF INJECTION SPEED, INJECTION PRESSURE, AND MOLD POSITION ON THE PRODUCTION OF POLYPROPYLENE (PP) LOUNGE CHAIRS Wisnu Pambudi; Muhamad Choirul Mahfudin
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 21 No. 2 (2022): Berkala Penelitian Kulit, Sepatu dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/adf1c778

Abstract

Injection molding is making products made from plastic materials through melted plastic and then injected into a mold or mold. The plastic lounge chair is made of polypropylene (PP) by injection molding. In the injection molding process, there are parameters of injection speed, pressure, and molding position. This study aims to determine the effect of injection speed, pressure, and mold position. Injection speed, injection pressure, and improper mold position can produce a lounge chair with short-shot defects. Short-shot defects cannot be repaired but must be recycled by chopping them up to be reused as additional material for producing plastic products; this will increase operational costs. Efforts to reduce short shots can be done by changing the speed parameter settings, injection pressure, and mold position. Plastic lounge chairs, according to standards, were obtained by inverted mold position and injection speed settings in zones 1, 2, 3, 4, and 5 of 70, 60, 50, 45, and 30 in mm/s units. The injection pressures are 95, 85, 75, 65, and 55 bar.
Co-Authors Dewi Kumala Muhamad Choirul Mahfudin