| 摘要 |
The present invention concerns a structure of a turbulence pipe in the headbox of a paper machine/board machine. The invention also concerns a procedure for forming a turbulence pipe of a turbulence generator. The turbulence pipe (14a1.1, 14a1.2 ...; 14a2.1, 14a2.2...) comprises at least one vertical wall (16a1, 16a3; 16a1', 16a3') in the outlet end (D2) of the flow, comprising a corrugation (100), whereby, with the aid of said wall corrugation (100), the forming of so-called marking error, caused in the web by the vertical edge is avoided. |
