Effect of Heating at Oven-dry State on Steam Treated Bamboo Powder Thermal Fluidity
Effect of Heating at Oven-dry State on Steam Treated Bamboo Powder Thermal Fluidity
复制标题
烘干状态加热对蒸汽处理竹粉热流动性的影响
DOI：
10.1155/2015/579659
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发表时间：
2015
影响因子：
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通讯作者：
Takashi Iizuka
中科院分区：
文献类型：
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作者：
Shohei Kajikawa;Takashi Iizuka
在木质材料的热成型工艺中，了解烘干加热对木质生物质材料的热流动性等性能的影响非常重要。在这项研究中，未处理和蒸汽处理的竹粉的热流动性进行了测试，以探讨在烘干状态下加热对热流动性的影响。测试温度设定为200°C。在热流动测试之前，将粉末在毛细管流变仪中在200°C下以可变的加热时间干热。采用热重分析法研究了粉末在升温和恒温过程中的热变化。未经处理的粉末的流动性随着短时间的干燥加热而改善，但随着长时间的干燥加热而降低。相比之下，蒸汽处理的粉末流动性与未处理的粉末相比高，但其流动性没有从干热中得到改善。从这些热重分析结果来看，与组分挥发相关的化学变化与热流动性有关。因此，由于流动性相关组分通过挥发从粉末中逸出，因此发生了干热导致的流动性降低。
In hot molding processes of woody material, it is important to understand the effect of oven‐dry heating on the property of woody biomass material, such as thermal fluidity. In this study, thermal flow tests of untreated and steam treated bamboo powder were conducted to investigate the effects of heating at an oven‐dry state on thermal fluidity. The test temperature was set to 200°C. Before the thermal flow test, powder was dry‐heated in a capillary rheometer at 200°C with a variable heating time. Thermogravimetry was conducted to understand the thermal changes of the powder during an increasing temperature and constant temperature. Fluidity of untreated powder was improved with a short dry‐heating but decreased with a long dry‐heating. In contrast, steam treated powder fluidity was high compared to untreated one, but its fluidity did not improve from dry‐heating. From these thermogravimetry results, the chemical changes associated with component volatilization relate with the thermal fluidity. Therefore, the decrease in fluidity from dry‐heating occurred because fluidity related components escape from the powder through volatilization.