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All Journal AUSTENIT METAL : Jurnal Sistem Mekanik dan Termal Jurnal Riset danAplikasi Teknik Industri (JRATI) Serambi Engineering
Hernadewita
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Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The manufacture and distribution temperature of aluminum molding for plastic beam from waste PP H, Hendra; Putra, Yoga Rahmadi; Septiana, Reski; Hernadewita; Demustila, Harly; Rispandi; Hermiyetti; Rahmayetty
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 1 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.1.46-53.2025

Abstract

One method utilized in the production of plastic goods is injection molding. An essential part of the injection molding process is a mold, which is used to create different types of plastic goods in accordance with a preset design. The goal of this study is to create plastic beam molding molds using the EDM and milling production methods and evaluate the molds' form geometry and resilience to temperature. The material's thermal conductivity is 200 W/m.k. due to the properties of the 1060 aluminum alloy. It can be determined that the low mold temperature during the injection process causes plastic products to distort and swell. The results show that the EDM machining technique achieved a frequency of 142.8% and a duty cycle value of 57%. Using barrel temperatures of 1600C and 250°C for temperature resistance tests, the mold was determined to be in rather good condition when exposed to high temperatures. This is demonstrated by the results of testing the shape's geometry, which showed similarity in the product's dimensions with the mold and an increase in the product's dimensions.
Kajian Komprehensif Penerapan Ergonomi di Berbagai Sektor Kerja di Indonesia Tri Wahyu Setyawati; Hernadewita; Anwaruddin Yusuf; Hassan Fathuramdhan Wijaya
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This literature review synthesizes findings from 20 recent studies that apply ergonomic principles and methods in various work contexts in Indonesia. These studies highlight the importance of ergonomics in optimizing human well-being and system performance, as well as addressing problems such as discomfort, fatigue, decreased productivity, and the risk of musculoskeletal disorders (MSDs). This review identifies common approaches such as postural risk assessment methods (REBA, NBM, ROSA) and physical redesign interventions. The results from the application of ergonomics consistently demonstrate positive outcomes, including a reduction in MSDs risk and increased productivity. This review also highlights research gaps, including the lack of focus on cognitive and organizational ergonomics, longitudinal studies, cost-benefit analysis, and the implementation of real-time technology. Future research is suggested to explore more integrated and to guarantee the establishment of an ergonomic and risk-free work environment in Indonesia.
PENGARUH PADUAN JENIS PLASTIK PP, HDPE, DAN LDPE DAUR ULANG TERHADAP SIFAT MEKANIK BALOK PLASTIK HASIL INEJCTION MOLDING Hendra; Abdulah, Basuki; Ula, Shofiatul; Septiana, Reski; Hernadewita; Hermiyetti
AUSTENIT Vol. 17 No. 1 (2025): AUSTENIT: April 2025
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v17i1.10589

Abstract

The abundant amount of plastic waste and the high environmental problems it caused encourage the efforts to utilize recycled plastic materials in various applications, including the manufacture of plastic block produced using injection molding. This study aimed to analyze the effect of a mixture of recycled plastic types (PP, HDPE, and LDPE) on the mechanical properties of plastic blocks. Two of the three types of recycled plastic used were combined with a 1:1 composition and then molded into plastic blocks. Testing was carried out through tensile tests and impact tests to assess the tensile strength and toughness of the material. The results showed that the PP + HDPE alloy produced a tensile stress value of 26.2 MPa, a strain of 29.2%, and an elastic modulus of 89.6 MPa. While the average impact test value of this alloy reached 0.168 Joules/mm² with a maximum bending load of 3.94 kgf/cm². This alloy can be used as a reference material for manufacturing plastic blocks that have good mechanical properties.
Optimasi Peramalan Penjualan Perishable Product dengan Metode Time Series Menggunakan Software POM-QM Dewi, Yulida Intani; Herdiana, Mochamad Rafi; Hernadewita
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 01 (2025): Volume 03 Issue 01, Agustus 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i01.p10

Abstract

Perishable products are items with short shelf life. In this study, perishable product being analyzed has only one day shelf life. Therefore, an accurate forecast method is needed to avoid shortage and waste. Shortage occurs whend demand exceeds the company’s stock, resulting potential loss sales. Waste occurs when demand is lower than available stock, leading to overstock. Excexx inventory causing losses and reduces profit. This study is conducted using 2 scenarios, as shown in Table 1. Scenario 1 uses 60 days od data, while scenario 2 separates data between weekend and weekdays. Data abalysis was performed using time series method with POM-QM software. The best method is determined based on lower MAD, MSE, MAPE. The result of this study sho that separating the historical data between weekends and weekdays (scenario 2) leads to better forecasting accuracy, indicated by a lower MAPE compared to scenario 1. For weekend forecasting, the best method is exponential smoothing (Scenario 2A.2) with MAPE 10,05%. For weekday forecasting, the best method is moving average (Scenario 2B.1) with MAPE 15,40%. The research is expected to serve as a reference for company in selecting appropriate forecasting method. The goal is to help company anticipate shortage and waste in perishable products. The recommendation for company is automate the separation of weekend and weekday data to accelerate the forecasting prosess. Future research recommendation is use other forecast method and software, then consider factor consists of shelf life, promotion, national holidays, or national event.
The Manufacturing Process of Aluminum Hammer Molding using CNC 3 Axis for Waste Plastic in the Injection Molding Machine H, Hendra; Reski Septiana; Dio Restu Putra Ardhika; Hernadewita; Rahmayetty; Rispandi; Hermiyetti; Gusri Akhyar
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.139-145.2025

Abstract

A process called injection molding involves cooling molten plastic after it has been injected into a mold to create a finished product. Polypropylene (PP) and polyethylene terephthalate (PETE), two basic ingredients used in plastic, are melted into a liquid and then injected into a mold. tests pertaining to the geometry of the molded product's shape and the mold's resistance at 150 °C. The mold material used in this study is aluminum 6061, and the techniques used are modeling and experimentation. The 6061-aluminum material has good temperature resistance and yields dimensional results, thickness, and shape that are almost identical to the design developed based on geometry features, which makes it suitable for use in the plastic injection process, according to the test findings.
Co-Authors Abdulah, Basuki Anwaruddin Yusuf Dewi, Yulida Intani Dio Restu Putra Ardhika Gusri Akhyar Harly Demustila Hassan Fathuramdhan Wijaya Hendra H Herdiana, Mochamad Rafi Hermiyetti Nurwijayanti Putra, Yoga Rahmadi Rahmayetty Reski Septiana Rispandi Septiana, Reski Tri Wahyu Setyawati Ula, Shofiatul