| 摘要 |
<p>The system produces a non-slip wall or floor slab with proud surface portions having rough-grained surfaces and lower smooth portions. Formations of the slab surface is carried out in a single press operation, using a steel punch (18) with a number of recesses in its face, in which elastic compressible inserts (17) are fitted. The face of the punch can be flat in the rest position.</p> |
