| 摘要 |
<p>Supporting element constituted by two boards or plates (1, 2), and therebetween located zigzag shaped distance elements in the shape of strips (3). The strips are also of board or similar material that thas been bent to zigzag shape preferably after machining of the bending lines or precompressing these lines. The zigzag shaped strips and the plates or boards are glued together to one unit. Preferably the zigzag shaped strips are provided with reinforcement in the shape of threads of plastic, glass fibres etc. perpendicular to the bending lines.</p> |
