| 摘要 |
<p>Hollow profiles (1) are reinforced with ribbed structures (2) in which the ribs run perpendicular to the axis of the hollow profile (1) and the ends of the ribs (2) are provided with heat activatable adhesive material (3) which may be expandable activated to bond the end of the ribs (2) to the inner surface of the hollow profile (1).</p> |
