| 摘要:（摘要内容经过系统自动伪原创处理以避免复制，下载原文正常，内容请直接查看目录。） 本文以俄罗斯产落叶松(Larix gmelinii)锯材为对象，研究剖析了该种木材的枯燥特征和枯燥技巧。起首，对30mm厚和50mm厚度的试材各停止了四次枯燥实验，经由过程对实验进程中木材的温度、含水率、应力、干缩率及枯燥介质的温湿度等参数的剖析，联合枯燥进程中热、质传递纪律，总结出针对俄罗斯产落叶松较为公道的枯燥工艺，提出了进步枯燥质量和临盆效力的有用办法，为俄罗斯产落叶松锯材枯燥工艺的制订供给了实际根据和技巧参数；第二，测定了俄罗斯产落叶松木材的剖解学特征、物理特征，并与国产落叶松木材停止比拟，商量研究了俄罗斯产落叶松锯材发生枯燥缺点的缘由；第三，对分歧枯燥措施下俄罗斯产落叶松锯材的物理力学机能停止了测定，同时，采取扫描电镜不雅察剖析了枯燥后锯材的微不雅构造变更，并对锯材枯燥质量停止了评定；最初，依据上述研究成果，肯定了30mm厚和50mm厚俄罗斯产落叶松锯材的枯燥基准，提出了改良俄罗斯产落叶松锯材枯燥质量的有用办法。木材剖解特点和力学性质的研究剖析注解，俄罗斯产落叶松木材管胞壁薄、壁腔比小、密度低，枯燥进程中不容易发生变形、开裂等枯燥缺点，俄语论文范文，且木材的力学机能绝对较低。对分歧枯燥措施的俄罗斯产落叶松锯材物理力学性质停止比拟研究发明，气干材的密度略年夜于室干材，变形水平略小于室干材。但从全体上看，室干处置对木材的物理力学性质作用其实不显著，在任务效力上具有显著的优势。经由过程系列的枯燥工艺实验和对枯燥进程的剖析，提出了枯燥30mm和50mm厚度俄罗斯产落叶松锯材的公道枯燥工艺基准。采取新枯燥工艺基准枯燥的俄罗斯产落叶松锯材制品率到达98%以上，个中一等材到达90%以上。经由过程对实验进程的剖析研究，还提出了在干临盆燥进程中应当留意的事项1) 枯燥进程早期不宜采取较强的枯燥介质前提；2) 中期处置的机会须要提早；3) 降温枯燥工艺对俄罗斯产落叶松的枯燥临盆是可行的，但要选择适合的降温机会。经由过程扫描电镜不雅察发明，俄罗斯产落叶松木材细胞的径壁具缘纹孔数量较多，且多具纹孔膜，该木材除在树脂道中含有树脂外，在一部门管胞胞腔内和一些木射线细胞中也含有树脂，这些树脂的存在严重障碍了水蒸汽在木材中的活动，从而作用枯燥速度，使锯材易发生枯燥应力；该木材的心材，在一些纹孔缘、纹孔膜及细胞腔等外面，常笼罩有一层薄的膜状物或非纤维素膜或阿拉伯半乳糖的笼罩膜，是下降木材渗入渗出性的主要身分之一。对俄罗斯产落叶松锯材经气干和室干后的微不雅结构停止不雅察发明，气干材纹孔膜无显著变更，俄语论文范文，而室干材多涌现纹孔膜决裂的情形，但改良了水份流畅的通道。微不雅结构的不雅察剖析，为前述枯燥工艺研究和基准切实其实定供给了根据。 Abstract: This paper to Russian production of sawn timber for Larch (Larix gmelinii) as the object, it studies and analyzes the the kind of wood boring and boring techniques. First of all, the 30mm thickness and 50mm thickness of the tested materials all stopped four times boring experiment, analysis through the process of wood experiment in the process of temperature, moisture content, stress, dry shrinkage and dry medium parameters such as temperature and humidity, combined with dry process of heat and mass transfer in discipline, summed up the boring process for Russia larch wood is fair, puts forward the effective ways to improve the quality and effectiveness of the boring production, for the Russian Larch boring process design provides a theoretical basis and technique parameters; second, the determination of the Russian larch wood anatomy characteristics, physical characteristics, and compared with domestic larch wood, discuss on the cause of Russian production of Larch occurred boring defect; third, the physical and mechanical property of Russian Larch Lumber dry method under the functional differences stop test , at the same time, take observations of scanning electron microscope analysis of the dry timber micro Ya structure change, and assessment on the quality of sawn wood boring; initially, according to the research results, affirmed the 30mm thick and 50mm thick Russian Larch sawn timber boring benchmark proposed good Russian Larch sawn timber drying quality of useful way. The anatomical characteristics and mechanical properties of wood research and analysis notes, Russia larch wood tube cell wall thin, wall to lumen ratio of low density, low, boring boring process are not easy to deform and crack of the shortcomings of the and mechanical performance of wood is relatively low. For different dry methods of Russian Larch sawn timber physical and mechanical properties of a comparative study of invention, air dry density of wood slightly larger to dry wood, deformation level is slightly less than the room dry wood. But from the whole perspective, the physical and mechanical properties of the wood is not significant, and it has a significant advantage in the task force. Through a series of boring process experiment and analysis of the boring process, the boring of 30 mm and 50 mm thickness Russia Larch sawn timber reasonable boring process benchmark. Take new dry process benchmark boring Russia Larch sawn timber product rate reach more than 98 percent, a medium material reached more than 90%. Through the experimental process analysis and research, also put forward in dry dry to give birth process should pay attention to matters 1) boring process early should not take strong boring medium premise; 2) Interim disposal opportunities need to shift to an earlier date; 3) cooling the boring process of Russian Larch boring birth is feasible, but to select a suitable cooling opportunities. Wood boring of pipe diameter through scanning electron microscope observations of invention, Russia larch wood cell wall bordered pit quantity more and more pit membrane, the wood except in the resin containing resin, in a sector cell cavity and some wood ray cells also contain resin, the resin in the presence of a serious obstacle to the water vapor in the wood, thus affecting the drying speed, the lumber prone to stress; the wood heartwood, in some pit, pit membrane and cell cavity outside, often shrouded with a layer of thin membranous or non cellulose membrane or Arab galactose covering membrane, decreased infiltration of the main factors. The Russian Larch Lumber Qi dry and dry after the micro structure of Ya stop indecent observes the invention, air dried wood pit membrane had no significant change and room dry material emerge pit membrane rupture, but improved the water flowing channel. The micro structure observation analysis, for the boring process research and reference and in fact set according to supply. 目录: |
