Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1998-09-30
2000-10-31
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
100153, 162361, D21F 308
Patent
active
061396915
ABSTRACT:
A shoe press for a paper or board machine, comprising a press shoe, a counter roll and a circulated flexible belt. A plurality of hydraulic loading cylinders for pressing the press shoe against the counter roll are arranged between a horizontal frame beam and the press shoe. The pistons of the loading cylinders are connected to the horizontal beam. The shoe press may have first hydrostatic compartments in the surface of the press shoe facing the counter roll and second hydrostatic compartments arranged between the side of the press shoe facing the loading cylinders and the loading cylinders. For supplying the working chambers of the loading cylinders and/or the first and/or second hydrostatic compartments with hydraulic fluid, there is arranged a duct which extends in the longitudinal direction of the press shoe and is common to all working chambers and the first and second hydrostatic compartments, respectively. The duct for connecting the working chambers is at least partially formed by tubular duct members which are formed separately from the frame of the shoe press and which extend between and fluidly connect adjacent pairs of loading cylinders. In a preferred embodiment, the tubular duct members are slidably inserted in bores formed through the pistons of the loading cylinders, and a seal is disposed between the duct members and the bores for sealing of the joints.
REFERENCES:
patent: 5620566 (1997-04-01), Holopainen
patent: 5843283 (1998-12-01), Hennsler et al.
patent: 5997695 (1999-12-01), Ilmarinen
patent: 5997696 (1999-12-01), Gustavsson et al.
patent: 6017422 (2000-01-01), Brox
Hastings Karen M.
Valmet-Karlstad AB
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