Paper making and fiber liberation – Apparatus – Automatic control
Patent
1994-08-02
1996-08-27
Czaja, Donald E.
Paper making and fiber liberation
Apparatus
Automatic control
162259, 251 4, 251 58, D21F 108, F16K 704
Patent
active
055497934
ABSTRACT:
Pinch valves having a flexible, constrictable sleeve are used to control a dilution headbox for a paper making machine. A variety of pinch valves may be used in the present invention with the pinch valves being actuated by pneumatic or hydraulic pressure or by mechanically pinching the valves' sleeves by means of rams driven by stepper or linear drive motors. For pneumatic control, dynamic differential pressure drops are measured across the valves to determine flow rate through the valves. A pinch valve, referred to herein as a torsional pinch valve, is disclosed for dilution headbox control. In one form, a first end of a sleeve is fixedly mounted in a support frame and the second end of the sleeve is mounted for rotation in the frame. A driver rotates the second end of the sleeve such that a flow path through the sleeve is controlled. The flow path is a maximum when no torsion is placed on the sleeve and is reduced to substantially zero by sufficient rotation. In another form, first ends of two sleeves are secured into a support frame such that the sleeves are in axial alignment with one another. The second ends of the sleeves are secured to an annular collar or sleeve support member which is mounted for rotation between the fixedly mounted first ends. By rotating the annular collar, the cross section of the flow path is controlled.
REFERENCES:
patent: 3522926 (1970-08-01), Bryant et al.
patent: 3556461 (1971-01-01), Little
patent: 3927369 (1975-12-01), Billeter et al.
patent: 4066534 (1978-01-01), Arya
patent: 4073467 (1978-02-01), Little et al.
patent: 4135550 (1979-01-01), Andersson
patent: 4195810 (1980-04-01), Lavin
patent: 4372528 (1983-02-01), Raftis
patent: 4523737 (1985-06-01), Wentworth
patent: 4694861 (1987-09-01), Goodale et al.
patent: 4898643 (1990-02-01), Weisshuhn et al.
patent: 4899783 (1990-02-01), Yusko, Jr. et al.
patent: 4909904 (1990-03-01), Kinzler
patent: 4987924 (1991-01-01), Rush et al.
patent: 5097868 (1992-03-01), Betush
patent: 5102228 (1992-04-01), Vine-Lott
patent: 5107883 (1992-04-01), Shaw
patent: 5196091 (1993-03-01), Hergert
patent: 5206568 (1993-04-01), Bjornson et al.
patent: 5273905 (1993-12-01), Muller et al.
Goldshdeyn Alexsey
Hellstrom Ake A.
ABB Industrial Systems Inc.
Czaja Donald E.
Padgett Calvin
LandOfFree
Control of dilution lines in a dilution headbox of a paper makin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control of dilution lines in a dilution headbox of a paper makin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of dilution lines in a dilution headbox of a paper makin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1054038