| 摘要 |
<p>The binder has two logs (1) e.g. plank, with a width dimension (4) between 100 to 600 millimeter (mm), and a thickness dimension (5) of 30 mm, which are glued with each other by a vertical glued joint (2) in a position and cut from the logs. The logs have a splint wood yard at top and/or bottom and a core in the middle. The logs are provided at a side that is to be adhered with a core side lying longitudinal relaxing groove (8). The groove accomplishes pith (6) and runs longitudinally along or middle of the width dimension of the log at more than 10 mm.</p> |
