Chukwunedum, Ogochukwu Chinedum, Nelson Obinna Ubani, and Jude Ezechi Dara. “Polypropylene Plastic Cup Tensile Strength Optimization in Injection Molding from the Mold Variables Using Response Surface Methodology”. Tech : Journal of Engineering Science 2, no. 1 (March 7, 2026): 63–82. Accessed April 30, 2026. https://jurnal.sinesia.id/index.php/tech/article/view/745.