Effect of The Particle Size of Polypropylene with Flakes Shape on Rotational Molding
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Abstract
This research aims to study the effect of polypropylene particle size with flake shape on the rotational molding process. The polypropylene used in the experiment was obtained from waste plastic glass with transparent single-use packaging. The procedure of research started with the waste plastic glass crushing and sieving into small (rPP-S), medium (rPP-M), and large (rPP-L) sizes, then the characteristics of particles were analyzed. The specimens were molded with the axial powder flow apparatus at a rotation speed of 7 rpm, using a molding temperature of 210 °C. The phenomena that occurred during the molding were observed and recorded. After that, the tests of the physical, thermal, and mechanical properties were carried out. The results showed that small particle size directly affected the rotational molding both in the solid state which is involved in particle motion and the heat transfer of the particles and in a liquid state which involved the bubbles in the specimens. Comparing the potential of processibility, it was found that the case of rPP-S had higher potential and compressive strength than rPP-M and rPP-L about 21.77% and 30.49% respectively.
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