| 摘要 |
<p>A conveyor belt 15 providing the floor of a foaming tunnel 2 is enclosed by an insulating housing which is divided into an upstream chamber and a downstream chamber by transverse partitions 19, 20, 21 each of which can assume an open or closed condition. Between the downstream end of the tunnel and means 14 for collecting a web laid on the conveyor at the upstream end of the tunnel, there is means 22, 23, 24 for drying the surface of the bottom of the block. <IMAGE></p> |
