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Pengaruh Energizer Kerang Dara, Kerang Hijau, dan Kerang Tiram terhadap Kekerasan Perkakas Potong HSS pada Proses Powder Nitriding Setyawan, Hendra; Jaman, Winda Sri; Sonjaya, Muhammad Luthfi; Alfarizi, Tito
Majalah Teknik Industri Vol 32 No 2 (2024): Majalah Teknik Industri
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

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Perkakas potong dari High-Speed Steel (HSS) memiliki peran krusial dalam industri manufaktur, terutama dalam proses pemotongan dan pembentukan material. Kekerasan dan ketahanan aus dari perkakas potong sangat mempengaruhi efisiensi dan kualitas produksi. Proses nitriding adalah metode yang umum digunakan untuk meningkatkan sifat mekanik HSS, dengan tujuan meningkatkan kekerasan permukaan dan ketahanan aus melalui difusi nitrogen ke dalam material. Penelitian ini mengeksplorasi penggunaan bahan alami sebagai energizer dalam proses powder nitriding, khususnya cangkang kerang dara, kerang hijau, dan kerang tiram. Bahan-bahan ini kaya akan kalsium karbonat (CaCO3) dan mineral lain yang dapat memperkuat hasil nitriding. Sampel HSS tanpa perlakuan nitridasi memiliki kekerasan dasar 784,73 HVN, digunakan sebagai baseline untuk mengevaluasi efektivitas proses nitriding dengan energizer kerang. Hasil penelitian menunjukkan bahwa semua jenis kerang mampu meningkatkan kekerasan HSS, dengan cangkang kerang tiram memberikan peningkatan tertinggi hingga 71,6% (1346,47 HVN) pada suhu 600°C selama 3 jam. Kerang hijau menunjukkan stabilitas kekerasan yang baik di berbagai kondisi, sedangkan kerang dara mengalami penurunan kekerasan pada suhu tinggi, akibat over-diffusion nitrogen. Penelitian ini menyimpulkan bahwa pemanfaatan energizer cangkang kerang, terutama kerang tiram pada proses powder nitriding, dapat meningkatkan kekerasan HSS secara signifikan.

Analisis Penerapan K3 di Lingkungan Laboratorium Politeknik Industri Petrokimia Banten Fitri, Triani Aulya; Jaman, Winda Sri
Majalah Teknik Industri Vol 32 No 2 (2024): Majalah Teknik Industri
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

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Penelitian ini bertujuan untuk menganalisis penerapan Kesehatan dan Keselamatan Kerja (K3) di lingkungan laboratorium Politeknik Industri Petrokimia Banten (PIPB). Metode penelitian yang digunakan adalah survei kuantitatif dengan kuesioner yang diberikan kepada 115 mahasiswa dari tiga program studi. Hasil penelitian menunjukkan bahwa mayoritas mahasiswa memahami pentingnya K3 dan penerapannya di laboratorium. Namun, masih terdapat beberapa aspek yang perlu ditingkatkan, seperti fasilitas laboratorium, pemahaman mahasiswa terhadap risiko kerja, dan kepatuhan terhadap aturan K3. Peningkatan implementasi K3 sangat diperlukan untuk menciptakan lingkungan laboratorium yang lebih aman dan meminimalisir risiko kecelakaan.

Pengaruh Penambahan Kalsium Karbonat (CaCO₃) Terhadap Kekerasan Material HDPE/LDPE Enggita, Asadian Puja; Ikhsandy, Ferry; Jaman, Winda Sri; Syafaatullah, Achmad Qodim
REACTOR: Journal of Research on Chemistry and Engineering Vol 6, No 1 (2025): June 2025
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v6i1.179

Plastic waste recycling has been extensively studied, particularly in applications such as paving blocks, asphalt mixtures, and composite boards. One critical parameter affecting the quality of these products is material hardness. This study examines the effect of CaCO₃ addition on the hardness of polymer composite materials. The preparation process involved collecting, washing, drying, sorting, and shredding plastic waste, followed by mixing High Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) at a ratio of 1:5. Calcium carbonate (CaCO₃) was added at varying concentrations (0%; 0,5%;1,0%; 1,5%, and 2,0%), and the mixture was melted using an extruder and subsequently molded. The results indicate that the addition of 1,5% CaCO₃ yields the highest and most stable hardness value across three tests, achieving 4,77 HV with a standard deviation of 0,0577. Furthermore, microstructural analysis reveals that up to 1,5% CaCO₃ leads to the most uniform filler distribution, optimizing both hardness and material stability. This study reveals that increasing CaCO₃ concentration enhances composite material hardness when evenly distributed and homogeneous. However, excessive CaCO₃ concentration may result in agglomeration, negatively impacting composite properties.

Pengaruh Penambahan Kalsium Karbonat (CaCO₃) Terhadap Kekerasan Material HDPE/LDPE Enggita, Asadian Puja; Ikhsandy, Ferry; Jaman, Winda Sri; Syafaatullah, Achmad Qodim
REACTOR: Journal of Research on Chemistry and Engineering Vol. 6 No. 1 (2025)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v6i1.179

Plastic waste recycling has been extensively studied, particularly in applications such as paving blocks, asphalt mixtures, and composite boards. One critical parameter affecting the quality of these products is material hardness. This study examines the effect of CaCO₃ addition on the hardness of polymer composite materials. The preparation process involved collecting, washing, drying, sorting, and shredding plastic waste, followed by mixing High Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) at a ratio of 1:5. Calcium carbonate (CaCO₃) was added at varying concentrations (0%; 0,5%;1,0%; 1,5%, and 2,0%), and the mixture was melted using an extruder and subsequently molded. The results indicate that the addition of 1,5% CaCO₃ yields the highest and most stable hardness value across three tests, achieving 4,77 HV with a standard deviation of 0,0577. Furthermore, microstructural analysis reveals that up to 1,5% CaCO₃ leads to the most uniform filler distribution, optimizing both hardness and material stability. This study reveals that increasing CaCO₃ concentration enhances composite material hardness when evenly distributed and homogeneous. However, excessive CaCO₃ concentration may result in agglomeration, negatively impacting composite properties.

Produksi Briket dari Limbah Plastik dan Ampas Tebu dengan Metode Pirolisis Pasaribu, Monita; Sena, Muhammad Arya; Kristiani , Maria; Jaman, Winda Sri; Enggita, Asadian Puja; Supardi, Supardi
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 2 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i2.599

Plastic is a polymer product that is widely used in society. This resultx in an increase in plastic waste. Plastic waste processing needs to be done to prevent environmental emissions. Plasstic waste can be converted into an alternative energy source in briquettes. The reasearch object is to produce briquettes from plastic and sugarcane bagasse. Plastic briquettes and bagasse have a ratio of 1:2, 1:1 and 2:1. The second stage is the preparation and design of the tool using the pyrolisis method. Research variables include the composition of plastic waste and sugarcane bagasse. Analysis of briquette products includes calorific value, ash conten and water conten. The results of research on briquette products with variations in sampel A having a ratio of 1:2, sample B with ratio of 1:1 and sample C with a ratio 2:1 respectively show a calorific value of 3,929 cal/g, 4.013 cal/g, 4,222 cal/g; water content values of 8,6%, 6,7%, 5,8%, the ash content value is 5,4%, 7,2% and 8,6% and the volatile matter value is 15.3, 13.2% and 12,6%.

Bioplastik Berbasis Pati Sagu dengan Penambahan Filler Microfibrillated Cellulose dan Refuse-Derived Fuel Betariani, Khairunisa; Rahayu, Puji; Jaman, Winda Sri; Wirandi, Mohammad
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4105

This study aims to develop starch-based bioplastics using sago starch with the addition of Microfibrillated Cellulose (MFC) and Refuse-Derived Fuel (RDF) fillers to enhance mechanical properties and material sustainability. Sago starch was selected as the base material due to its biodegradability, while MFC derived from empty palm oil fruit bunches served as a structural reinforcement, and RDF was introduced as an additional filler sourced from processed organic and inorganic waste. The bioplastic production process involved starch gelatinization, mixing with MFC and RDF solutions, addition of sorbitol as a plasticizer, casting, and natural drying. Characterization included morphological analysis and mechanical testing. Results showed that the sago starch+MFC bioplastic exhibited a more homogeneous surface morphology and superior mechanical properties, with a maximum tensile strength of 10.6 MPa and elongation at break of 5.7%. The addition of RDF increased material density but reduced homogeneity and toughness, with fracture energy per volume drastically decreasing from 488.28 kJ/m³ to 41.15 kJ/m³. Overall, the combination of sago starch and MFC offered better mechanical performance, while RDF addition requires optimization to maintain structural integrity. This innovation supports waste utilization and promotes circular economy principles in the development of environmentally friendly materials.

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