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All Journal Jurnal Rekayasa Mesin Journal of Mechanical Engineering and Applied Technology Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Informatika
Iman Mujiarto
Politeknik Negeri Semarang
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Rancang Bangun dan Uji Kinerja Mesin Pengolah Slurry Limbah Biogas Menjadi Pupuk Kompos Menggunakan Sistem Pemanas Gas LPG Timotius Anggit Kristiawan; Trio Setiyawan; Iman Mujiarto; Atikah Ayu Janitra; Muhammad Ghani Ardi Kurniawan; Rafiq Afrizal Bastian
Journal of Mechanical Engineering and Applied Technology Vol. 4 No. 2 (2026): VOLUME 4 ISSUE 2 YEAR 2026 (JULY 2026)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v4i2.7835

Abstract

Slurry generated from biogas production is commonly treated using natural drying methods, which require 30–40 days and intensive manual handling, making the process inefficient for practical applications. This study aims to design and evaluate the performance of a slurry drying machine utilizing LPG as a heat source with a capacity of 30 kg. The research methodology includes mechanical design, fabrication, and experimental performance testing. The developed system integrates a mechanical pressing unit, a rotating mixing drum, and a controlled LPG heating system driven by a 0.5 HP electric motor. Experimental results show that the machine is capable of reducing slurry mass by approximately 50% within 150 minutes at an operating temperature of 65–70 °C. The highest drying rate occurred during the first 30 minutes, indicating rapid moisture removal in the initial stage. Compared to conventional solar drying, the proposed system significantly reduces processing time while improving drying consistency. The developed machine demonstrates potential as an efficient and practical solution for converting biogas slurry into value-added organic fertilizer, particularly for small to medium-scale farming applications.
Analisis Desain Pengaduk terhadap Aliran Fluida pada Rancang Bangun Mesin Pencuci Jig di PT UVW Iman Mujiarto; Wahyu Isti Nugroho; Kaget Wijaya Omar Tadashi; Diana Langgeng Mustikawati
Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Informatika Vol. 4 No. 1 (2026): Januari: Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Inform
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupiter.v4i1.1317

Abstract

PT UVW uses jigs in the vacuum metalizing process that require washing, which is currently done manually, resulting in inefficiency and risks to operators, thus, jig washer machine was created in order to reduce the risk for operators and increasing efficiency, which based on horizontal mixer. This study analyses the effect of agitator design on fluid flow patterns in a jig washing machine to obtain an optimal design. Two agitator design alternatives were developed and tested using Computational Fluid Dynamics (CFD) simulations at rotational speeds of 70, 75, and 100 rpm, followed by prototype fabrication and performance testing. Simulation results show that the second design produces a higher fluid velocity (20.4 m/s) and a more turbulent and uniform flow pattern compared to the first design (1.7 m/s). Field tests confirmed that the second design achieves higher washing effectiveness (97.14%) with reduced water consumption and shorter washing time. The optimally designed agitator washing machine increases productivity by six times compared to manual washing and reduces operator exposure to hazardous chemicals. This study recommends the second agitator design for improving washing efficiency and effectiveness.
Design and Performance Testing of a Keychain Product Mold for a Learning Module in the Metrology and Plastic Moulding Laboratory at XYZ Timotius Anggit Kristiawan; Trio Setiyawan; Farika Tono Putri; Atikah Ayu Janitra; Abdul Syukur Alfauzi; Iman Mujiarto; Dieta Wahyu Asry Ningtias
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, December 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6563

Abstract

In the current technological era, plastic assumes a crucial role in daily life. This is substantiated by the continuously escalating demand for plastic-based products. Manufacturing items by reshaping plastic raw materials necessitates the use of plastic forming tools or machinery. A prevalently utilized apparatus is the injection molding machine, which employs a specialized mold. The mold design process mandates rigorous calculations and planning to ensure the production of dimensionally identical and uniform parts, thereby facilitating mass production. The primary objective of this research was to design, implement, and validate a mold for plastic injection molding, specifically intended for the mass production of keychains. The methodology employed was the Sighley's Mechanical Engineering Design approach, which encompasses the following sequential procedures: Problem Identification, Problem Definition, Synthesis, Analysis and Optimization, Evaluation, and Presentation. The fabricated keychain mold yielded two products per injection cycle, with mold dimensions (L×W×H) measuring 110 mm×100 mm×160 mm. The mold was mounted on the injection molding machine, requiring a clamping force of 46710 N, with system control provided by an Arduino and cooling facilitated by an external fan. The test results identified the optimal operating parameters for a single molding process, comprising a heating temperature of 210°C, an injection time of 17 seconds, and a cooling time of 12 seconds.
Co-Authors Abdul Syukur Alfauzi Atikah Ayu Janitra Diana Langgeng Mustikawati Farika Tono Putri Kaget Wijaya Omar Tadashi Muhammad Ghani Ardi Kurniawan Ningtias, Dieta Wahyu Asry Rafiq Afrizal Bastian Timotius Anggit Kristiawan Trio Setiyawan Trio Setiyawan Wahyu Isti Nugroho