摘要 |
<p>The channel (1) has a channel-sided channel wall (7) divided in a longitudinal direction of the channel, where the wall is formed by two partial walls (8, 9). The walls are elastically movable in a transverse direction, and lips (13, 14) are attached at each wall in a transverse area between its edges and a separating point (10). The edges are turned towards the point. The lips are material elastically opened downwards from the channel. The lips together forms a lip pair for a channel closure, which is material elastically opened downwards and elastically opened in the transverse direction.</p> |