...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Wood material science & engineering >Wood defects during industrial-scale production of thermally modified Norway spruce and Scots pine
【24h】

Wood defects during industrial-scale production of thermally modified Norway spruce and Scots pine

机译：工业规模生产热改性挪威云杉和苏格兰松树中的木材缺陷

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This research investigates wood defects, particularly the formation of surface cracks, during the production of thermally modified wood and its exposure to cyclic moisture changes. Boards of Norway spruce and Scots pine originating from different steps within the production of ThermoWood® were collected and wood defects were investigated at macroscopic and microscopic scale. Subsequently, the wood was exposed to capillary wetting cycles to record its sensitivity towards cracking. After the modification process, typical anatomical defects of conventional kiln-drying became more frequent and severe, with the magnitude being to some extent depending on the presence of defects in the raw material. At microscopic scale, damages to ray parenchyma and epithelial cells as well as longitudinal cracks within the cell walls of earlywood tracheids were evident in thermally modified wood. Despite a lower water uptake and higher dimensional stability, thermally modified wood was more sensitive to surface cracking during wetting cycles than unmodified wood, i.e. at the outside face of outer boards (near bark). For limiting surface cracking of thermally modified wood during service life, the use of high-quality raw material, the exposure of the inside face of the boards (near pith) and the application of a surface coating are considered beneficial.
机译：这项研究调查了在热改性木材的生产过程中木材的缺陷，特别是表面裂纹的形成以及暴露于循环水分变化中。收集了来自ThermoWood®生产过程中不同步骤的挪威云杉板和苏格兰松木，并从宏观和微观角度对木材缺陷进行了研究。随后，使木材经受毛细管润湿循环以记录其对开裂的敏感性。改性处理后，常规窑干的典型解剖缺陷变得更加频繁和严重，其严重程度在一定程度上取决于原材料中缺陷的存在。在微观尺度上，热改性木材对射线薄壁组织和上皮细胞的损害以及早材气管胞壁内的纵向裂纹是明显的。尽管较低的吸水率和较高的尺寸稳定性，但与未改性的木材（即在外板的外表面（靠近树皮））相比，热改性的木材在润湿过程中对表面开裂更敏感。为了限制使用寿命内热改性木材的表面开裂，使用优质的原材料，暴露木板的内表面（靠近髓）和表面涂层的使用被认为是有益的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号