壓縮木材指接接合與層積膠合之研究

Study of Finger-joints and Laminations of Compressed Woods

黃國雄(Gwo-Shyong Hwang) ； 熊如珍(Ju-Chen Hsiung)

《台灣林業科學》 16卷4期 (2001/12) Pp. 275-283

https://doi.org/10.7075/TJFS.200112.0275

摘要

本研究旨在瞭解壓縮木材指接接合與層積膠合之性能，以杉木造林木為材料，於不同壓縮量之條件下進行橫向壓縮加工製成壓縮木材，並經200℃熱處理4h後，以尿素樹脂膠合劑進行指接接合與層積膠合。機械強度試驗內容包括靜曲試驗、縱向壓縮試驗與縱向拉伸試驗，其中靜曲試驗依載重方向分弦向與徑向。
由試驗結果得知，壓縮木材之比重隨壓縮量之增加而明顯增大。壓縮木材與其層積膠合材無論是弦向或是徑向之MOR與MOE均隨比重之增加而明顯增大，而其指接接合材之MOE亦隨比重之增加而增大，但MOR則否。在任一試驗材料與任一壓縮量之條件下，弦向之MOR與MOE均較徑向者大。壓縮木材與其指接接合材或層積膠合材之縱向壓縮強度均隨比重之增加而明顯增大，但指接接合材之增大幅度較其他兩者小。壓縮木材與其層積膠合材之縱向拉伸強度隨比重之增加而明顯增大，但其指接接合材則否。

關鍵字

杉木 ； 壓縮木材 ； 指接接合 ； 層積膠合

並列摘要

The purpose of this study was to understand the properties of finger-jointed and laminated compressed wood. China fir (Cunninghamia lanceolata) wood cut from a plantation forest was compressed in the radial direction under different compression sets and then heat-treated at 200℃ for 4 h. Compressed wood was finger-jointed and laminated with urea-formaldehyde resin adhesive. Bending, longitudinal compression, and longitudinal tension tests were performed. In the bending test, loads in the radial and tangential directions were used.
The specific gravity of compressed wood increased with greater compression set. The MOR and MOE of compressed wood increased with specific gravity for loads in both the radial and tangential directions, and the same results were observed for laminated wood made with compressed wood. The MOE, but not the MOR, of finger-jointed wood made with compressed wood also increased with increasing specific gravity. The MOR and MOE in the tangential direction were larger than those in the radial direction for all of the tested materials and compression sets. The compressive strengths parallel to the grain of compressed wood, laminated wood, and finger-jointed wood made with compressed wood increased with increasing specific gravity, but the extent of increase for finger-jointed wood was smaller than those of the other two. The tensile strengths parallel to the grain of compressed wood and laminated wood made with compressed wood, but not finger-jointed wood made with compressed wood, increased significantly with increasing specific gravity.

並列關鍵字

China fir ； compressed wood ； finger-joint ； lamination