摘要
青冈属木材材质好,在我国具有一定数量的蓄积量。木材加工企业在生产中通常将其分为白青冈、红青冈类,但其树种间材性存在差异,部分树种自身变异也较大,干燥时易开裂。青冈是白青冈类中的一种,至今未得到充分利用。针对30mm厚青冈锯材,采用3种干燥基准分别对其进行干燥工艺的初步研究,旨在探讨合理的青冈锯材干燥工艺,为其加工利用提供理论依据和实践指导。结果表明：干燥初期锯材含水率下降速度快,前期干燥温度不宜过高,应采用低温预热并保持一段时间,干球温度不应高于40℃,干湿球差需控制在1℃。风速控制在1.0~1.2m/s,甚至更低为宜。研究证明采用合理的多阶段干燥基准,控制各含水率阶段的干燥速度,可以有效减少青冈锯材干燥过程中的开裂等干燥缺陷,满足二级干燥锯材质量的要求,可应用于地板基材、家具用材。
Cyclobalanopsis wood has good properties,and there is a certain amount of storage of it in China.It is generally classified as white oak and red oak in the manufacturing process of wood industry.However,the properties of them with different species are different.The variation in the same species is also significant that some of them may easily cause drying cracks.Cyclobalanopsis glauca,as a type of white oak,has not been fully utilized.A preliminary study on drying process of three schedules was performed using 30mm-thick sawn timber of glauca.This study will contribute in providing a theoretical basis and practical guidance for the drying technology and use of white oak.Results indicate that moisture content of sawn timber during early drying stage decreases significantly.The drying temperature in this period should not be too high.It is recommended to preheat the timber at low-temperature for some time.The dry bulb temperature should not be higher than 40 ℃ and psychrometric difference should be within 1℃.And the wind speed should be controlled at 1.0~1.2m/s or even lower.The drying defects are significantly reduced by the combination of using reasonable drying schedules at different steps and controlling the drying rates in different moisture content steps.The drying quality of the product can reach to grade-2 in the National Standard,which is suitable for floor and furniture.
出处
《森林工程》
2011年第2期31-34,共4页
Forest Engineering
基金
国家自然科学基金项目(30871981)
关键词
青冈
锯材
干燥工艺
干燥质量
Cyclobalanopsis glauca
sawn timber
drying technology
drying quality
