A compression molding machine was developed to produce bio-composite polymers using rice and coffee husks as reinforcing filler (5% weight) with high density polyethylene (95% weight) as the base polymer. Rice and coffee husks are typically disposed by open burning in fields. Their use as reinforcing fillers therefore reduces on the negative impacts of their disposal. The developed compression molding machine was constructed using mainly mild steel and stainless steel. It consisted of heating chamber, mold base, compression shaft and observation window. A temperature controller was incorporated to regulate the temperature in the heating chamber. Elongation, tensile strength and water absorption tests were carried out on the developed bio-composite polymers. Results indicated that inclusion of rice husks (5%) reduced the tensile strength and percentage elongation of the developed bio-composite polymer. Similar results were observed with coffee husk. Highest water absorption rates of 8% were observed for bio-composite polymers developed with Arabica coffee husks. American Society for Testing and Materials. 1998. ASTM. ASTM D570-98: standard test method for water absorption of plastics. American Society for Testing and Materials. 2003. ASTM. ASTM D638-03: standard test method for tensile properties of plastics.
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