| 摘要 |
A tube bank apparatus is disclosed for distributing stock in a headbox of a papermaking machine. The apparatus includes a tube having a first and a second portion for the flow therethrough of the stock. The first portion defines a bore for the flow therethrough of the stock, the bore having an upstream and a downstream end. The second portion defines a passage for the flow therethrough of the stock, the passage having an upstream and a downstream extremity. The upstream extremity of the passage cooperates with the downstream end of the bore so that the stock flows from the upstream end to the downstream end of the bore and then through the upstream extremity and then the downstream extremity of the passage. A first, second and third edge define at least a part of the downstream extremity of the passage, the second edge extending between the first edge and the third edge such that a sum of a first angle defined between the first edge and the second edge and a second angle defined between the second edge and third edge is less than 180 degrees.
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