System compensating for pressure fluctuations in a paper machine

Details System compensating for pressure fluctuations in a paper machine System compensating for pressure fluctuations in a paper machine

1975-10-29

1977-06-21

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

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

162340, 162341, D21F 106

Patent

active

040309711

ABSTRACT:
A method and mechanism for compensating for pressure fluctuations in a paper machine stock flow system for conducting stock from a supply pump to a slice opening including providing a flexible diaphragm as one wall of the stock conduit with the diaphragm dampening pressure variations and being supported on its opposite side by air in an air chamber divided into compartments with a support compartment immediately opposite the diaphragm and a supply compartment behind the support compartment and the compartments divided by an attenuator wall. Air is supplied continuously at a reference pressure to the supply compartment, and a relief valve is positioned in the support compartment with the port opened or closed by movement of the diaphragm so that air is bled from the support compartment as the diaphragm moves toward the stock conduit with a drop of pressure therein. In another form, the structure includes a diaphragm wall between a distribution chamber of a headbox and an air chamber with a valve controlling the release of pressure from the air chamber and controlled by the position of the diaphragm.

REFERENCES:
patent: 3247049 (1966-04-01), McKie et al.
patent: 3573160 (1971-03-01), Lopas
patent: 3649446 (1972-03-01), Makela
patent: 3853694 (1974-12-01), Parker
patent: 3856619 (1974-12-01), Davidson et al.

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