D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/17.1
D21F 1/06 (2006.01)
Patent
CA 1053047
Abstract of the Disclosure 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 being the support compartment and the com- partments divided a by an attenuator wall. Air is supplied con- tinuously 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 included 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.
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