Stock liquor pressure pulsation absorbing apparatus and method

Details Stock liquor pressure pulsation absorbing apparatus and method Stock liquor pressure pulsation absorbing apparatus and method

1998-06-12

1999-12-07

Chin, Peter

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

13711516, 13711525, 13756534, 162380, 417 442, D21F 100

Patent

active

059976934

ABSTRACT:
A stock liquor pressure pulsation absorbing apparatus of an active type is able to absorb pressure pulsations in an ordinarily demanded frequency range of 0.01 to 100 Hz. A by-pass pipe (2) extracts a portion of a stock liquor from a master pipe (1) for supplying the stock liquor to a paper machine headbox. A control pump (7) returns a portion of the stock liquor so extracted into the by-pass pipe. A detector (3) detects a stock liquor pulsation pressure at a branch point, or on an upstream side thereof, of the by-pass pipe and master pipe for controlling the control pump. The pressure pulsation, including the low frequency range, of the stock liquor is thereby absorbed accurately and precisely, variations in the basis weight are made small and a stable supply of final products with a high quality can be attained.

REFERENCES:
patent: 4308095 (1981-12-01), Brendemuechl
patent: 4384922 (1983-05-01), Stotz

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