Patent ID: 8795473
Filing Date: 2014-08-05
Classification: D21F

Abstract:
1. A tube bank apparatus for distributing stock in a headbox of a papermaking machine, said apparatus comprising: a tube having a first and a second portion for the flow therethrough of the stock; said first portion defining a bore for the flow therethrough of the stock, said bore having an upstream and a downstream end; said second portion defining a passage for a flow therethrough of the stock, said passage having an upstream and a downstream extremity, said upstream extremity of said passage cooperating with said downstream end of said bore so that the stock flows from said upstream end to said downstream end of said bore and then through said upstream extremity and then said downstream extremity of said passage; and a first, second and third edge defining at least a part of said downstream extremity of said passage, said second edge extending between said first edge and said third edge such that a sum of a first angle defined between said first edge and said second edge and a second angle defined between said second edge and said third edge is less than 180 degrees so that wall effects of said tube on the distributing of the stock exiting said tube is minimized.