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E3S Web of Conferences 187, 05003 (2020) https://doi.org/10.1051/e3sconf/202018705003 TSAE 2020 The development of rotational molding of waste bamboo powder with LLDPE plastic powder Tapragon Ouprara 1* and Kiattisak Sangpradit2 Rajamangala University of Technology Thanyaburi Department of Agricultural Engineering, 39 Moo1 Klong 6, Thanyaburi, Pathum Thani, 12110,Thailand Abstract. The objective of this study was to assess the effect of bamboo powder addition and the treatment of its surface on the properties and structure of rotationally molded (rotomolded) polypropylene. In this study we can transform plastic and bamboo powder into a product by putting the raw materials into hollow mold and then cover the mold. The mold is rotated along two axes by burning with high temperature to make liquid plastic flows evenly along the inner surface of the mold with gravity. The results of this research had shown that, by using LLDPE plastic 4 kg, bamboo waste powder 1 kg size of 0.15: 0.30: 0.85 mm tested with humidity 10:15:20% mixed and then molded, it was found that the moisture of waste bamboo powder had a direct effect on molding. If the moisture in the bamboo powder is more than 20%, the work will not be molded. It shown look like a lump. The moisture content less than 15% can be molded as a product. In terms of the size used in this test 0.15: 0.30: 0.85 can be molded well in the range of moisture, not more than 15%. 1 Introduction Rotational molding is a widely use technological process for the production of thin walled products, usually characterized by large dimensions. The main advantages in comparison to alternative processes are the technological machine as well as high technology flexibility. Simultaneously one of the biggest disadvantage accompanying to production of rotomolded casting is the necessity of using material with the specified with geometrical characteristic and processing properties, especially rheological properties [1]. Rotational moulding is a closed-mould plastics manufacturing process for producing large hollow objects. Each production cycle comprises of four stages: material charging, heating, cooling and demoulding, with the mould rotating bi-axially during both the heating and cooling stages. The rapid development of this process as a mainstream plastics manufacturing method is attributed to its many advantages, such as the absence of residual stresses, the low manufacturing and material costs, and the capability of manufacturing large and high quality products. However, some limitations also exist such as the high mould cost, the long processing times, the limited mouldable materials and the mould shape complexity. More than 85% of the raw materials used in the rotomoulding industry worldwide are the linear polyethylenes (both low and medium densities) due to their thermal durability in the * Corresponding author: tapragon@gmail.com © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).PDF Image | development of rotational molding of waste bamboo powder with LLDPE
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