Surface-checking occurring conditions in air-drying off softwood lumber for construction use.

建筑用软木风干时表面状况的检查。

• 批准号: 12660145
• 负责人: SHIDA Satoshi
• 金额: $ 2.43万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12660145/
• 关键词: air drying; sugi; surface checking; drying condition; drying stress; hemlock; wood drying; column; 水食い材; トドマツ; 水分傾斜; 柱材; 環境条件; 室内環境; 損傷; 建築用針葉樹製材; 水分蒸発量

This year is the final year for this research. The final research report was published in the form of a booklet. Research results for this year were described as below by referencing the research items 1, 2 and 3 in this year's application of execution.1.Relation between surface-checking and tension strength perpendicular to grain of wood Drying stress was measured by strain gauges along with the width direction of board, which sizes are 10cm in width, 5cm in thickness, and 35cm in length, respectively and the drying stress distribution was found in the width direction as the result. Tension stress was also found in the fiat main dried-board. The board with semi-straight grain has the possibility to occur the compressive stress caused by absorption of moisture besides the tension stress which is the reason of surface checking. However this phenomenon is not clear. So it needs the more correct examination.2.Examination of surface-checking under 0℃ drying condition.This examination could not be accomplished. This remains for the future research.3.Relations between the climate in Japan and surface-checking of lumberThe paper named "Surface checking in air-drying of boxed-heart softwood in Japan" was submitted to Forest. Products Journal, which is an International Journal for Wood Sciences, and is in print.Future subject : Effect of temperature under 0 ℃ and wind velocity on the surface checking remained as the future subject.

今年是这项研究的最后一年。最后的研究报告以小册子的形式出版。参照本年度申报研究项目1、2、3，将本年度的研究成果介绍如下：1.利用应变片测量木材干燥应力沿板材宽度方向的应变片，板材的宽度方向为10 cm，厚度为5 cm，长度为35 cm，得到干燥应力在宽度方向上的分布。平板主干板中也存在拉应力。半直纹板除产生拉应力外，还有可能产生吸湿引起的压应力，这也是造成板材表面开裂的原因。然而，这一现象并不明显。因此需要更准确的检验。2.在0℃干燥条件下的表面检验，这项检验不能完成。3.日本气候与木材表面检验的关系这篇题为《日本箱心针叶木材风干表面检验》的论文已提交给森林。未来主题：0℃以下的温度和风速对表面检测的影响仍是未来的主题。

项目成果

信田 聡: "天然乾燥想定条件によるヘムロック柱材の乾燥時の表面割れと水分傾斜"第53回日本木材学会大会(福岡)研究発表要旨集. (CD-ROM). (2003)

Satoshi Shinoda：“假设自然干燥条件下铁杉柱材料干燥过程中的表面开裂和湿度梯度”日本木材学会第 53 届年会研究报告摘要集（福冈）（2003 年）。

蛯原,信田,有馬,今井: "スギ柱材の天然乾燥における表面割れの観察"第51回日本木材学会大会研究発表要旨集. (2001)

Ebihara、Shinoda、Arima、Imai：“雪松柱材料自然干燥过程中表面裂纹的观察”日本木材协会第 51 届年会研究报告摘要（2001 年）。

信田 聡: "天然乾燥想定条件によるヘムロック柱材の乾燥時の表面割れと水分傾斜"第53回日本木材学会大会(福岡)研究発表要旨集. CD-ROM. (2003)

Satoshi Shinoda：“假设自然干燥条件下铁杉柱材料干燥过程中的表面开裂和湿度梯度”第 53 届日本木材科学学会会议研究报告摘要集（福冈）（2003 年）。

信田 聡: "天然乾燥想定条件によるヘムロック柱材の乾燥時の表面割れと水分傾斜"第53回日本木材学会大会研究発表要旨集. (in press). (2003)

Satoshi Shinoda：“假设自然干燥条件下铁杉柱材料干燥过程中的表面开裂和水分梯度”第 53 届日本木材科学学会会议研究报告摘要集（2003 年）。

Ken Watonabe, Satoshi Shida: "between surface Relationship checking and the orientation of annual rings for sugi lumber."Proceedings of The 21^<st> annual meeting (Tokyo)of Wood Technological Association of Japan. 100-101 (2003)

Ken Watonabe、Satoshi Shida：“杉木表面关系检查与年轮方向之间的关系。”日本木材技术协会第 21 届年会（东京）会议记录。