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All Journal Heuristic Industrial & System Engineering Journals (ISEJOU)
Kononis, Elisabet Priska Arkadewi
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Decision Sciences, Operations Research & Management Engineering Environmental Science Industrial & Manufacturing Engineering Transportation

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PENERAPAN PENGECORAN LOGAM ALUMINIUM MENGGUNAKAN CETAKAN ALTERNATIF CAMPURAN SILIKA DAN BENTONIT Massa, Paschal Nicollas Dominggo; Kononis, Elisabet Priska Arkadewi; Nathanael, Randy Abednego; Iwanto, Agustinus; Purba, Lasman Parulian; Nurhayati, Lilis
Industrial & System Engineering Journals (ISEJOU) Vol. 3 No. 1 (2024): ISEJOU, Vol 3, No 1 Desember 2024
Publisher : Universitas Katolik Darma Cendika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37477/isejou.v3i1.737

Abstract

Metal casting is one of the manufacturing methods widely used to produce components with complex shapes and high precision. This study aims to evaluate the use of alternative molds based on a mixture of silica sand and bentonite in aluminum casting. Variations in the composition of silica sand and bentonite are applied in the casting process to observe their effects on the surface quality of the casting results and the efficiency of the production process. The results of field observations show that the optimal composition consists of 85% silica sand, 10% bentonite, and 5% graphite, which produces a mold mixture with good consistency, is not easily cracked, and is able to replicate pattern details with high precision. In addition, molds with this composition are easier to shape and have good resistance during the casting process, thereby reducing the risk of mold failure. Thus, molds based on silica sand and bentonite have the potential to be a more efficient and environmentally friendly alternative in metal casting technology.
MTTR, MTBF, and OEE Analysis of a Blown Film Extrusion Machine for Preventive Maintenance Optimization Kononis, Elisabet Priska Arkadewi; Irawati, Desrina Yusi; Andrian, David
Heuristic Vol 23, No 2 (2026) (on progress)
Publisher : Fakultas Teknik Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30996/heuristic.v23i1.133252

Abstract

Blown Film Extrusion Machines are critical equipment in the plastic manufacturing industry, where machine reliability and maintenance effectiveness significantly affect productivity and product quality. This condition was observed in a plastic manufacturing plant in Sidoarjo Regency, where maintenance activities are still predominantly reactive and lack a structured preventive maintenance system. This study aims to analyze the performance and reliability of Blown Film Extrusion Machines and to determine critical components as a basis for optimizing preventive maintenance through the integration of Overall Equipment Effectiveness (OEE), Mean Time Between Failure (MTBF), and Mean Time to Repair (MTTR). The research methodology employs a quantitative descriptive approach with an applied case study design. Data collection was conducted through direct observation of 11 Blown Film Extrusion Machines, including data on downtime, failure frequency, repair duration, operating time, and production output consisting of good and defective products. Data processing involved calculating OEE to evaluate machine effectiveness, MTBF to measure reliability, and MTTR to assess repair efficiency. Downtime analysis was also performed to identify components contributing most significantly to production stoppages. The results indicate an overall OEE value of 73%, an MTTR of 229.89 minutes, and an MTBF of 1,421.67 minutes. The PLC, chiller, and bearing were identified as the main contributors to downtime. This study concludes that low machine effectiveness is caused by frequent failures and prolonged repair times, highlighting the need to prioritize preventive maintenance on critical components to improve machine reliability and effectiveness.
Co-Authors Andrian, David Desrina Yusi Irawati Iwanto, Agustinus lilis nurhayati Massa, Paschal Nicollas Dominggo Nathanael, Randy Abednego Purba, Lasman Parulian