3 research outputs found
PENGARUH VARIASI FRAKSI VOLUME KOMPOSIT AKAR WANGI DENGAN MATRIKS POLIURETAN MENGGUNAKAN METODE COMPERSSION MOLDING TERHADAP KEKUATAN TARIK
No full textFraksi volume pada proses pembuatan komposit sangat berpengaruh terhadap kekuatan mekaniknya. Penelitian ini bertujuan untuk mengetahui pengaruh variasi fraksi volume komposit serat akar wangi dengan matriks poliuretan terhadap kekuatan tarik. Bahan yang digunakan dalam penelitian ini adalah serat akar wangi sebagai penguat dan poliuretan sebagai matriks. Variasi fraksi volume serat dan resin yang digunakan adalah 10:90%, 20:80%, dan 30:70%. Proses pembuatan komposit dilakukan dengan metode compression molding selama 24 jam pada tekanan 5 bar. Pengujian kekuatan tarik mengacu pada standar ASTM D638. Hasil penelitian menunjukkan bahwa kekuatan tarik maksimum tertinggi sebesar 1,298 MPa diperoleh pada fraksi volume 30% serat dan 70% resin. Sedangkan kekuatan tarik terendah sebesar 0,777 MPa terjadi pada fraksi volume 10% serat dan 90% resin
Analisis Pengaruh Konfigurasi Mata Pisau Pada Mesin Pencacah Sederhana Terhadap Kualitas Cacahan Material Pla dan Pet
No full textIn everyday life, both organic and inorganic waste remain persistent problems, with plastic waste being a significant environmental concern in Indonesia. According to the Ministry of Environment and Forestry, the national waste volume in 2021 was estimated at 68.5 million tons. Although most plastics are recyclable, efficient recycling depends on proper size reduction mechanisms. Polyethylene terephthalate (PET) is one of the most commonly used plastics, and polylactic acid (PLA) is also increasingly applied due to its biodegradable properties. However, there is a lack of comparative studies on blade design performance for shredding different plastic types. This study aims to develop a plastic shredder capable of processing PET, PLA, and their mixtures, and to evaluate the effect of three blade configurations—straight, zig-zag, and wave—on particle size outcomes. Experimental testing revealed that straight blades produced the largest average particle sizes: 5.63 mm for PET and 5.04 mm for PLA. Zig-zag blades yielded the smallest sizes: 4.70 mm for PET and 2.36 mm for PLA. The wave blade configuration produced intermediate results: 5.60 mm for PET and 4.17 mm for PLA. PLA consistently resulted in smaller particles than PET across all configurations. The zig-zag blade design proved most effective for fine shredding, particularly for PLA material. These results highlight the importance of blade geometry in optimizing shredding performance and plastic recyclability. This research provides insights for the development of efficient, small-scale recycling machines tailored to different plastic types and offers a practical approach for reducing plastic waste in local communitie
Mechanical Properties Analysis of Composites (PLA, Chitosan and Calcium Prosphate) for bone implants
No full textThis research explores the mechanical properties of composites made from Polylactic Acid (PLA), chitosan, and calcium phosphate, which have potential applications in bone tissue engineering due to their biocompatibility and biodegradability. This research aims to optimize the strength and durability of composites for biomedical use, with a focus on tensile strength, elongation and surface hardness. This research found that the addition of calcium phosphate increased the tensile strength and hardness of the PLA matrix to optimal concentrations, the highest tensile strength value of 80 MPa while chitosan increased elasticity and ductility. The hardness test results show an average value of 309 HV/100. The combination of these materials produces a balanced composite with better mechanical properties, making it suitable for bone implant applications
