摘要
采用预蒸与常规干燥结合的方式对辐射松(Pinus radiata)锯材进行脱脂和干燥处理,分析预蒸处理对辐射松边材和心材含水率、脱脂率和干燥质量的影响。结果表明:预蒸处理可以缩短心材的干燥时间,对边材的影响不大。由于边材含脂率低、渗透性好,预蒸处理对边材的脱脂率影响不大,预蒸与常规干燥结合以及常规干燥两种工艺处理边材的脱脂率均在60%左右;对于心材,预蒸处理促进松脂迁移,预蒸组的脱脂率大于对照组,但心材初含水率低、渗透性差,导致心材脱脂率低于边材。预蒸组和对照组工艺处理的试材均表现出良好的抗松脂渗出效果,预蒸组表观质量更好。预蒸处理对辐射松边材和心材的干燥质量基本无影响,但需注意防范心材螺旋纹理造成的木材干燥过程中扭曲变形缺陷的发生。
The sawn timber of radiata pine(Pinus radiata)was degreased and dried by combining pre-steaming and conventional drying.The effects of pre-steaming on the moisture content(MC),the deresination rate,and the drying quality of radiata pine sapwood and heartwood were analyzed.The results showed that after the pre-steaming treatment,the drying time of heartwood shortened but the drying time of sapwood had little change.Because the lower resin content and higher permeability of sapwood,the pre-steaming had a little effect on the deresination rate of sapwood.The deresination rate of the sapwood was about 60%in both with and without pre-steaming techniques.For heartwood,pre-steaming treatment promoted the migration of resin,so that the deresination rate of the pre-steaming group was higher than that of the control group.However,the initial MC of the heartwood was low and the permeability was poor,so the deresination rate of heartwood was lower than that of sapwood.Both the pre-steamed group and the control group showed good anti-resin-exudation.The visual quality of the pre-steaming group was better than that of the control group.In conclusion,pre-steaming treatment had no significant effect on the drying quality of sapwood and heartwood.Special attention was paid to prevent the distortion caused by the spiral texture of heartwood in the process of wood drying.
作者
曹惠敏
殷方宇
周永东
伊松林
周凡
高鑫
CAO Huimin;YIN Fangyu;ZHOU Yongdong;YI Songlin;ZHOU Fan;GAO Xin(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;College of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China)
出处
《木材科学与技术》
北大核心
2023年第5期69-76,共8页
Chinese Journal of Wood Science and Technology
基金
中央级公益性科研院所基本科研业务费专项资金“进口辐射松木材提质处理技术研究”(CAFYBB2021QA003)。
关键词
预蒸处理
辐射松
脱脂率
木材干燥质量
边材
心材
pre-steaming treatment
radiata pine
deresination rate
wood drying quality
sapwood
heartwood
作者简介
曹惠敏(1994-),男,博士研究生。Email:huimin.cao@caf.ac.cn;通讯作者:周永东,男,研究员。Email:zhouyd@caf.ac.cn。
