Apparatus and method for controlling the stock flow to a paper m

Details Apparatus and method for controlling the stock flow to a paper m Apparatus and method for controlling the stock flow to a paper m

1971-06-04

1976-09-21

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162253, 162258, 162262, 162263, 2351511, D21F 106, D21F 108

Patent

active

039817679

ABSTRACT:
In a paper machine headbox system including a stock pump and a headbox receiving stock from the stock pump, the stock pump is shunted by a by-pass line. The stock flow to the headbox is primarily controlled by controlling the by-pass flow in the by-pass line by use of a by-pass flow control valve. When the by-pass flow control valve approaches one of its operating limits, i.e. either full open or full closed, the flow to the by-pass line is manipulated so as to reposition and maintain the by-pass flow control valve within its operating limits. A logic inhibit means, logically responsive to by-pass flow control signals, inhibits the stock flow rate in the main stock line.

REFERENCES:
patent: 3562104 (1971-02-01), Taylor
pearson, J. H., "Automatic Headbox Operation" Tappi, vol. 46, No. 10 (10-1963), pp. 192A-195A.
McKnight, I. M., "Dev. in the Wider Appl. of Control to P.M. Flow Boxes" Paper Technology, vol. 7, No. 1, (1966), pp. 45-52.

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