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Pradhana Kurniawan
Politeknik Negeri Madiun
Computer Science & IT Electrical & Electronics Engineering

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Weaving Architecture Effects on Mechanical and Chemical Performance of Alkali-Treated Coconut Fiber Composites Agus Choirul Arifin; Deni Nur Fauzi; Noorsakti Wahyudi; Agus Susanto; Pradhana Kurniawan; Yoga Ahdiat Fakhrudi; M. Shafwallah Al. Aziz
Jurnal E-Komtek Vol 10 No 1 (2026)
Publisher : Politeknik Piksi Ganesha Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/e-komtek.v10i1.3245

Abstract

This study examines the effect of fabric architecture and alkali treatment on the properties of coconut fiber–polyester composites as an alternative environmentally friendly material. Coconut fibers were treated with 15% NaOH for 2 hours and woven in basket weave and twill weave patterns. The composites were made using a vacuum-assisted resin infusion method with a fiber fraction of 40%, and compared with E-glass composites as a control. FTIR analysis showed a decrease in the intensity of the absorption band in the range of 1200–1300 cm⁻¹, indicating a reduction in lignin content after alkali treatment. The mechanical test results showed that the basket weave composite had higher tensile and flexural strengths, respectively, of 20.40 N/mm² and 78.45 N/mm², compared to the twill weave at 12.98 N/mm² and 52.31 N/mm². However, the highest impact resistance was obtained in the twill weave at 23.61 J/mm². The results of the study indicate that the weave architecture has a significant effect on the mechanical performance of the composite and has the potential to support the development of sustainable composite materials for engineering applications.
Modeling and Optimization of PET Filament Making Machine Control System Based on Response Surface Methodology Deni Nur Fauzi; Pradhana Kurniawan; Imam Junaedi; Rendi Pambudi Wicaksono; Nabila Bilqis Mahardi
Jurnal E-Komtek Vol 9 No 2 (2025)
Publisher : Politeknik Piksi Ganesha Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/e-komtek.v9i2.3017

Abstract

This study aims to model and optimize the control system of a PET filament making machine using Response Surface Methodology (RSM). Two main variables, namely extrusion temperature and winding speed, were analyzed through the Central Composite Design experimental design with the help of Design-Expert 13 software. A quadratic model was developed to predict the filament diameter, and the results of the analysis of variance showed that the model was statistically significant and able to represent the nonlinear relationship between variables. Optimization based on the desirability function produced optimum operating conditions at a medium temperature and winding speed range. Experiments showed that the combination of a temperature of 240–245 °C and a speed of 9–12 rpm produced a consistent filament diameter of 1.7 mm with 70–80% flexibility and a smooth surface.
Co-Authors Agus Choirul Arifin Agus Susanto Deni Nur Fauzi Fakhrudi, yoga ahdiat Imam Junaedi M. Shafwallah Al. Aziz. R Nabila Bilqis Mahardi Noorsakti Wahyudi Rendi Pambudi Wicaksono