| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 94 === This study is to produce agroforest waste particle-plastic composites by flat-platen pressing. Wood, bamboo, and rice-hull waste particles were used as bio-based materials, and virgin high density polyethylene (HDPE) and recycled polyethylene were used as plastic materials in this study. In addition, effects of pressing time and temperature on physical and mechanical properties were evaluated by CNS 2215 standard. The results demonstrate that, the distribution of plastic powder can be improved by adding stick agents in the composites.
To develop an appropriate processing to save the time spending during composite manufacture, various pressing temperature were applied. According to these results, it revealed that processing time is the shortest (ca. 14 min) when the beginning temperature, mat center temperature, and cooling temperature were set on 200oC, 180oC, and 100oC, respectively. Whereas, the longest processing time (ca. 42 min 15 s) was observed, when the beginning temperature was set on 100oC, temperature of mat center on 180oC, and cooling temperature on 50oC.
Both the thickness swelling and water absorption of composites were increased by increasing the weight proportion content of agroforest waste after soaking in water for 24 hr. On the other hand, when the weight ratio of wood particle to HDPE is 60:40 (W60P40), the composite shows the best MOR (177.4 kgf/cm2). When the weight ratio of bamboo particle to HDPE is 60:40 (B60P40), the composite has the highest retention percentage on bending strength, and the best wood screw holding strength (89.8 kgf).
Except for rice-hull particles-HDPE (R80P20) and rice-hull particles-recycled PE (R70RP30) samples, the internal bond strength of all the test composites exceeds the threshold of CNS 2215 standard (type 18 unfinished particle board) threshold in this study.
|
|---|
