竹集成材高频热压过程中板坯内温度的变化趋势  

Temperature inside mats of high-frequency, hot pressed, glued and laminated bamboo

作　　者：NGUYEN Thi Huong Giang 张齐生[1] 

机构地区：[1]南京林业大学家具与工业设计学院竹材工程研究中心,江苏南京210037 [2]越南林业大学木材工业学院,河内156204

出　　处：《浙江农林大学学报》2015年第2期167-172,共6页Journal of Zhejiang A&F University

基　　金：国家林业公益性行业科研专项(201304503)

摘　　要：以毛竹Phyllostachys edulis集成材为研究对象,在不同条件下进行高频热压,通过对竹集成材板坯高频热压过程中芯层温度变化的统计分析,得到了竹集成材高频热压过程中板坯温度的变化规律。结果表明:在试验条件范围内,随着板坯含水率从6%增加到18%,涂胶量从200 g·m-2增加到300 g·m-2,板坯的温度明显升高。升温过程可以分为快速升温和慢速升温2个阶段。在快速升温阶段板坯内的温度随板坯初含水率、涂胶量及加热时间的提高而递增;在慢速升温阶段板坯初含水率及涂胶量对板坯内的温度的影响很小,板坯芯层升温速度随加热时间的增加而减少。通过试验数据分析,得出较优的高频热压胶合工艺条件为:涂胶量300 g·m-2,竹条含水率12%,高频热压时间7 min。To obtain variation in the temperature law for glued and laminated bamboo （GLB）, mats were hot pressed during two phases： fast heating and slow heating, with high-frequency at different moisture contents and amount of spreads. A statistical analysis on temperature variation inside the mats was conducted by Microsoft Excel software using ANOVA two-factor with replication analysis at a 95% confidence level. Results showed that when moisture content increased from 6% to 18%, the amount of spread increased from 200 to 300 g.m-2, during the first phase, temperature inside the mats increased slowly with increasing moisture content below 12%, amount of spread below 250 g.m-2, and pressing time, and increased sharply with moisture content above 12% and amount of spread above 250 g＇m-2; whereas, during the second phase temperature influence on mois- ture content and amount of spread inside the mats was very small at all conditions. Also during the second phase, the heating rate of the core layer decreased with an increase in pressing time. Optimum high-frequency hot pressing technological parameters for GLB manufacturing were as follows： amount of spread--300 g .m-2, moisture content of bamboo splits--12%, and pressing time--7 min. It mean that temperature inside the mats are satisfactory, is necessary to make high quality of GLB in order to improve the performance of GLB. [Ch, 3 fig. 4 tab. 18 ref. ]

关 键 词：木材科学与技术 含水率 热压时间 涂胶量 温度 毛竹材集成材 高频 

分 类 号：S781.6[农业科学—木材科学与技术]