| 摘要 |
<p>An improved end portion flow rate regulating apparatus for a paper machine headbox is disclosed, wherein pipings for end portion flows in a paper machine headbox are made compact, flow directions of jets can be regulated during operation, no stagnation is present in the flows, and a flow of dregs does not occur. Each of tubes 13 in end portions of a tube bank 3 placed in front of a slice chamber 5 of a paper machine headbox for branching flows from a taper header 2, is formed of a first tube consisting of an inlet portion 13a having a small inner diameter, a take-out portion 13b outgoing to the outside of the tube bank 3 and an outlet portion 13c contiguous to the take-out portion 13b, and a second tube 13d having a large inner diameter, and the piping inner diameter of the same take-out portion 13b is made larger than a piping inner diameter d1 of tubes 4 positioned in the central portion of the tube bank 3. In the take-out portion 13b are provided a flow rate regulating valve 16 and a flow meter 15. Paper making of paper webs having various properties can be achieved by changing flow rates of stock liquid flowing through the tubes 13 in the end portions by means of the flow rate regulating valves and also varying a ratio J/W of a jet velocity from the headbox to a wire velocity. <IMAGE></p> |
