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Dewi Izzatus Tsamroh
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Merdeka Malang
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Effect of seawater flow velocity in South Malang on the corrosion rate of low carbon steel with a corrosion coupon rack Suprapto, Agus; Irwandi, Jul Viansyah Dwiki; Jumiadi, Jumiadi; Tsamroh, Dewi Izzatus
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4897

Abstract

Corrosion is a phenomenon of damage to metal that can be influenced by several factors, including environmental factors, namely pH, humidity, temperature, and impurity factors. Corrosion that occurs due to the flow of a fluid is known as erosion corrosion. One type of metal that is susceptible to corrosion is carbon steel. Carbon steel material is very commonly used in the industrial world. An application of carbon steel is in piping systems that transport fluids; thus, fluid flow velocity affects the corrosion resistance of carbon steel. This research aimed to determine the effect of seawater flow on the corrosion rate of low carbon steel (ST 37) with variations in seawater velocity. This research is a type of laboratory-scale experimental research using coupon rack corrosion test equipment. The variations in seawater velocity used are 0 L/min, 15 L/min, 20 L/min, and 25 L/min. Observations of each experiment were carried out every 6 and 12 hours. The corrosion rate was analyzed using the weight loss method, namely by calculating the initial and final weight of the specimen before and after the experiment. The results show that increasing seawater flow velocity also increases the corrosion rate on steel specimens, with the lowest corrosion rate at 10.262 mpy on specimens with a variation of 0 L/min, while the highest corrosion rate is 48.743 mpy on specimens with a variation of 25 L/min. It can be concluded that the velocity of the fluid flow and the type of particles contained in the flow affect the rate of erosion-corrosion. The higher the fluid flow velocity and the more abrasive the particles contained in the flow, the faster the rate of erosion-corrosion.
DESAIN KERANGKA ALAT COUNTING PLANO UNTUK MENGHITUNG HASIL PRODUKSI PADA MESIN PAD 3 PT. XYZ Syafana, Mohammad Arju; Tsamroh, Dewi Izzatus; Asrizal
Journal of Industrial Engineering & Technology Innovation Vol. 3 No. 1 (2025): Journal of Industrial Engineering & Technology Innovation (JIETI)
Publisher : LENVARI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61105/jieti.v3i1.268

Abstract

A jig is a tool or device used to guide or hold an object in the manufacturing or assembly process. Usually, jigs are used to ensure precision and consistency in various types of work, such as drilling, cutting, milling, and assembly. The initial step in making a jig is usually done by creating a design. Design is a creative process that involves planning, arranging, and creating visual or functional elements to achieve certain goals. In a broader context, design is not only limited to the visual arts aspect, but also includes product design, architecture, user experience (UX), as well as communication and graphic design. Tjiwi Kimia Paper Factory, Tbk. PT. Tjiwi Kimia Paper Factory, Tbk. is a paper manufacturing industrial company. PT. Tjiwi Kimia Paper Factory, Tbk has succeeded in becoming the largest paper producing company in Indonesia, even in Asia, with the main product being paper, either in the form of sheet, roll, or has been converted into various kinds of stationery, as well as other products in the form of chemicals, such as NaOH, CaC03, HCl solutions, and others.
Diversifikasi Produk UMKM PASS Nanas Berbasis Limbah Nanas Melalui Penerapan Teknologi Tepat Guna Tsamroh, Dewi 'Izzatus; Sasongko, Muhammad Ilman Nur; Santi, Fitriana; Herawati, Andini Sofia; Azhar, Moh. Na'im
Seminar Nasional Penelitian dan Pengabdian Kepada Masyarakat 2025 Prosiding Seminar Nasional Penelitian dan Pengabdian Kepada Masyarakat (SNPPKM 2025)
Publisher : Universitas Harapan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35960/snppkm.v4i1.1323

Abstract

Pass Nanas MSME is a pineapple processing business unit in Kediri Regency that produces pineapple juice beverages. However, it faces challenges in managing production waste, particularly pineapple peels, which have only been used as animal feed. This issue affects business sustainability but also presents an opportunity to create added value through product innovation. This community service program aimed to support product diversification by utilizing pineapple peel waste into nata de pina with the help of a heavy duty blender. The program was carried out through field observation, needs analysis, training in nata de pina production, technical assistance in machine operation, and evaluation. The results showed that pineapple peel can be processed into nata de pina of good quality, with potential to be marketed as a functional food product. This innovation not only reduces organic waste but also expands product variety, thereby improving the competitiveness of the MSME in local and regional markets. Moreover, the program enhanced the partner’s skills in waste utilization, introduced the concept of a circular economy, and strengthened the business sustainability of Pass Nanas MSME.
Analisis Sifat Mekanik dan Penyerapan Air Komposit Polyester Berbasis Serat Alami Kus Andrianto, Sis Nanda; Maulana, Jibril; Sentosa Riyanto, Obaja Eden; Tsamroh, Dewi Izzatus; Nur Sasongko, Muhammad Ilman; Andromeda, Tata; Simangunsong, Rahel; Fahrozy, Muhammad Micho
Jurnal Mekanik Terapan Vol 6 No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v6i3.7978

Abstract

Natural fibers are increasingly utilized as reinforcing materials in the modern materials industry. In this study, composites comprising 15% untreated coconut fiber, pineapple leaf fiber, palm fiber, corn husk fiber, or sugar cane fiber and 85% polyester were fabricated. Water absorption was evaluated by immersing the composites for 3, 7, 14, and 21 days. The tensile strength and morphology of unsoaked composites were also assessed to determine the influence of fiber type. Water absorption increased with immersion time for all composites, although the trends varied among fiber types. The coconut fiber composite exhibited the highest water absorption rate, whereas the pineapple leaf fiber composite demonstrated the lowest. The pineapple leaf fiber composite also achieved the highest tensile strength. In contrast, composites containing coconut fiber, palm fiber, corn husk fiber, and sugar cane fiber displayed lower tensile strength, attributed to imperfect interfacial bonding between the fibers and the polyester matrix.
Physicochemical Characterization and Epoxidation of Jatropha Curcas Oil for Eco-Friendly Engine Lubricant Applications Putra, Agus Dwi; pradani, Yayi Febdia; Dewi Izzatus Tsamroh; Zakaria, Yahya; Mahfudi Sahli Subandi
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.651

Abstract

This study aims to explore the potential of castor oil (Jatropha curcas L.) as a plant-based alternative engine lubricant and compare it to commercial mineral-based lubricants. The research process includes drying Jatropha seeds and epoxidizing the oil using oxidizing agents (H₂O₂) and (CH₃COOH) with variations of (1:0.075; 1:0.15; 1:0.225; and 1:0.30). Chemical testing was conducted to analyze the acid number of the oil, while physical testing was carried out to measure its viscosity index, flash point, and pour point. The results show that Jatropha oil has an acid number of 5.30, a viscosity index of 217, a flash point of 270°C, and a pour point of 0°C. Therefore, Jatropha oil demonstrates potential as a base material for engine lubricants due to its relatively high flash point, which approaches that of polyol ester (POE)-based oils. However, further modification with additives is required to lower its pour point, ensuring it remains fluid in colder climates such as those in subtropical regions.
Implementasi Paket Mesin Pengolah Pakan Ternak Limbah Jerami dan Tongkol Jagung Berbasis Ekonomi Sirkular di Sido Makmur I Tulungagung Pratomo, Danang Yugo; Tsamroh, Dewi 'Izzatus; Narmaditya, Bagus Shandy; Saputra, Catur Surya; Prakoso, Bagas Eka; Seftiansyah, Albi Abimanyu
I-Com: Indonesian Community Journal Vol 5 No 4 (2025): I-Com: Indonesian Community Journal (Desember 2025)
Publisher : Fakultas Sains Dan Teknologi, Universitas Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/i-com.v5i4.8079

Abstract

Kegiatan pengabdian ini dilaksanakan di Kelompok Tani “Sido Makmur I” Desa Rejosari, Gondang, Tulungagung. Mitra menghadapi masalah berupa kelebihan limbah tongkol dan jerami jagung, yang menimbulkan tantangan dalam pemanfaatannya. Pengabdian ini bertujuan untuk memanfaatkan kembali limbah tersebut menjadi pakan ternak fermentasi dengan menggunakan mesin pencacah dan pencampur. Metode pelaksanaan meliputi identifikasi masalah, observasi, perancangan alat, manufaktur, pengujian, pelatihan, dan evaluasi. Hasil menunjukkan bahwa mesin-mesin tersebut efektif menghasilkan pakan ternak, dengan kapasitas proses mesin pencacah 50-200 kg/jam dan mesin pencampur 120 kg/jam. Untuk memastikan keberlanjutan, dukungan berkelanjutan mencakup komunikasi untuk pengembangan dan bimbingan berkelanjutan terkait permesinan dan manajemen. Penerapan mesin pengolah limbah jagung telah menyelesaikan permasalahan mitra secara substansial, mendorong pemanfaatan produk sampingan pertanian yang lebih efisien dan bermanfaat bagi masyarakat.
Experimental analysis of process parameters in semi-automatic blow molding of PET bottles: a case study at Universitas Negeri Malang product Riyanto, Obaja Eden Sentosa; Tsamroh, Dewi Izzatus; Wandoyo, Ilham Akbar; Pancayudha, Den Arsyah Pilar; Faidillah, Hikmal
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8192

Abstract

This research aims to analyze the effects of key process parameters on product quality and defects in the semi-automatic blow molding of Polyethylene Terephthalate (PET) bottles at Malang State University (UM). The background of this study stems from the increasing demand for high-quality PET packaging and the limited number of direct experimental studies on semi-automatic machines, with a limited number of tests. Most previous studies have emphasized model-based simulation and optimization, while practical studies that observe the relationship between process parameters and defect characteristics remain rare. Unlike simulation-based studies, this work is based on direct field experiments under stable, industry-relevant machine settings to evaluate product quality and production readiness for mass manufacturing. The research method was conducted through direct experiments using 12.5 g PET preforms and a 330 mL capacity two-cavity mold. The main variables tested included preform temperature (70°C and 80°C), blow delay time (0.30–0.50 s), and low-blow duration (0.20–0.50 s). Bottle quality was evaluated based on thickness measurements, dimensions, and visual analysis of defects such as wrinkles, collapses, and wall irregularities. The results showed that a preform temperature of 80 °C and a low-blow duration of 0.50 s produced bottles of the highest quality, characterized by uniform wall thickness, flat bases, and minimal defects. In contrast, low-temperature settings (70 °C) resulted in high viscosity, leading to deformation and wrinkles. This optimal combination of parameters was proven to improve bottle structure homogeneity and reduce dimensional shrinkage to 1%. This study emphasizes the importance of temperature and blow time control in achieving stable, efficient, and mass-oriented PET bottle production, while strengthening the role of universities in experimental manufacturing applied research.
Comparative Analysis of Cost and Performance of Plastic Shredder Machines Using Heatmap-Based Scoring Maulana, Jibril; Tsamroh, Dewi 'Izzatus; Riyanto, Obaja Eden Sentosa; Widowati, Tamara Rahma; Sasongko, Muhammad Ilman Nur; Adrianto, Sis Nanda Kus; Lubis, Didin Zakariya
IJIEM - Indonesian Journal of Industrial Engineering and Management Vol 7, No 1: February 2026
Publisher : Program Pascasarjana Magister Teknik Industri Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijiem.v7i1.33929

Abstract

The growing problem of plastic waste requires innovative and sustainable solutions in terms of processing and recycling. One of the key technologies in the recycling process is the shredder machine, which serves to shred plastic waste into smaller sizes before further processing. However, in practice, industry players, especially at the microscale, often face a dilemma in choosing the optimal shredder machine between performance and cost aspects. This research aims to fill the gap by conducting a comparative analysis of three shredder designs based on price and technical performance criteria. The method used in this research involves quantitative measurements of vary in several key aspects, namely: physical dimensions (body area), frame length, transmission system (gearbox and/or clutch), storage capacity, chopper type, motor specifications (power), speed controller, additional features such as presser, foldability, and total price. Furthermore, the data was analyzed using a simple machine learning approach based on heatmap scoring with the help of Python libraries such as Pandas, Seaborn, and Matplotlib. The analysis results show that the 3rd design provides the best performance. This research contributes to data-driven decision making in shredder machine selection, with an approach that combines technical and economic aspects in an integrated manner. The findings are expected to serve as a reference for the development of efficient and sustainable waste plastic processing technology in the microscale industry sector.
Co-Authors Abdullah, Mohd Firdaus Abdurrabi Abdurrabi Abi Suwito Adrianto, Sis Nanda Kus Agus Suprapto Ahmad Muflih Ahmad Saepuddin Aji, Bagas Dwi Purnama Alief Muhammad Andrian Dwi Kristianto Andrianto, Sis Nanda Kus Andrijono, Djoko Andromeda, Tata Ani, Adi Izhar Che ANISA ZUHRIA SUGEHA Anitasari, Silvi Ardiansyah, Mochammad Fachrizal Arif Budiono Asrizal Azhar, Moh. Na'im Bagus Shandy Narmaditya Bella Cornelia Tjiptady Bella Cornelia Tjiptady Bimantara, Muhammad Yoka Brilliandy, Hikmal Akbar C., Muhammad Ilham Abednego Elsa Danang Yugo Pratomo Dandya, Habli Abid David Ross Dewi Puspitasari Diama Rizky Septiawan Didin Zakariya Lubis Dika, Johan Wayan Dimas Hani Saputra Djahilepang, Raywantus Baur Edi Subiyantoro Elsa C., Muhammad Ilham Abednego Ena Marlina Evi Rinata Fadillah, Rahmat Fahil Fahrozy, Muhammad Micho Faidillah, Hikmal Firdiansyah, Mokhamad Rizki Fitriani, Indah Martha Herawati, Andini Sofia Hikmal Akbar Brilliandy Ike Widyastuti Irwandi, Jul Viansyah Dwiki Jago, Thomas Apriliano Jibril Maulana Jumiadi Jumiadi, Jumiadi Kus Andrianto, Sis Nanda Mahfudi Sahli Subandi Mohammad Ainul Yaqin, Mohammad Ainul Muchammad Riza Fauzy Muhammad Arif Nur Huda Muhammad Ilham Abednego Elsa C. Muhammad Ilman Nur Sasongko Mutadafiq, Fiqih Syahdani Nika Devi Permata Wijaya Pancayudha, Den Arsyah Pilar Permatasari, Meirna Puspita Prakoso, Bagas Eka Prasanta, Ida Bagus Sradha Dana Prasetiyo, Ardianto Pratiwi, Y. R. Pungky Eka Setyawan Pungky Eka Setyawan Putra, Agus Dwi Putri, Widyarini Susilo Qur’aini, Dinda Faranita Rahmat Fahil Fadillah Ratna Fajarwati Meditama Riana Nurmalasari Riyanto, Obaja Eden Sentosa Rusdijanto Rusdijanto Rusdijanto, Rusdijanto Saifuddin Karim Santi, Fitriana Saputra, Catur Surya Saputra, Mohammad Iqbal Juan Seftiansyah, Albi Abimanyu Sekiwa Sentosa Riyanto, Obaja Eden Shiddiqy, Taqiyyudin Ahmad As Simangunsong, Rahel Sis Nanda Kus Andrianto Siskuhita, Dhoris Agritia Sudjatmiko Sudjatmiko, Sudjatmiko Sudjatmiko, Sudjatmiko Sunariati, Okta Rezki Syafana, Mohammad Arju Wandoyo, Ilham Akbar Wea, Efrida Widowati, Tamara Rahma Widyarini Susilo Putri Widyarini Susilo Putri Yahya Zakaria Yayi Febdia Pradani Yazirin, Cepi