摘要
竹材是珍贵木材的最佳替代品之一,而干燥质量和效率极大地影响竹材产品的质量和高值化利用。与木材解剖结构不同,竹材具有独特的维管束—薄壁梯度结构、无木射线以及各向异性等特性,在干燥过程中容易产生开裂、变形、翘曲等缺陷。文中综述了竹材干燥过程中内部水分存在状态及迁移规律,以及竹材自身构造对水分迁移的影响;对比分析了4种常见的竹材干燥方法及其优缺点,总结了3种干燥缺陷的主要影响因素。研究表明,干缩异性是竹材干燥过程中产生各种缺陷的主要原因。探明纤维饱和点上下竹材水分迁移与应力、应变等流变的关系和机理,对有效制定竹材干燥工艺、提高竹材干燥质量具有重要意义。
Bamboo is one of the best substitutes for valuable wood.The quality and the efficiency of drying greatly affect the quality and the high value utilization of bamboo products.Different from wood,bamboo has unique anatomical structure,characterized with such as vascular bundle-thin wall gradient structure,no wood rays and anisotropy,and it is easy to crack,deform and warp during drying.This paper reviews the state and the migration rule of water in bamboo timber during drying and the effect of bamboo structure on water migration,compares and analyzes the advantages and disadvantages of the four common methods of drying bamboo timber,and summarizes the main influencing factors to three kinds of drying defects.The research shows that the shrinkage is the main cause of various bamboo timber defects occurred in the drying process,and identifying the relationship between water migration and rheology such as stress and strain above and below fiber saturation point and its mechanism is of great significance to effectively develop bamboo timber drying process and improve the drying quality.
作者
刘泫江
杨琳
Liu Xuanjiang;Yang Lin(College of Furnishings and Industrial Design,Nanjing Forestry University,Nanjing 210037,China)
出处
《世界林业研究》
CSCD
北大核心
2024年第4期65-71,共7页
World Forestry Research
基金
国家自然科学基金面上项目“人工林桉木超临界CO_(2)干燥热质传递规律及皱缩抑制机制”(31870545)。
关键词
竹材干燥
水分迁移
干燥工艺
干缩异性
drying of bamboo timber
moisture migration
drying process
dry shrinkage characteristics
