Extended press zone with shallow hydrodynamic pocket

Details Extended press zone with shallow hydrodynamic pocket Extended press zone with shallow hydrodynamic pocket

1990-12-17

1992-05-05

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

100154, 162205, 162361, D21F 306

Patent

active

051104172

ABSTRACT:
A press with extended press zone in a paper machine comprising a rotating press roll (1), a press shoe (2), and a slide band (7) sliding along the surface of the press shoe, a web (6) being passed between felts (4, 5) through the press, where it is pressed between the roll (1) and the slide band (7). The press shoe (2), designed to operate hydrodynamically, has a surface provided with a pocket area (d) formed by one or more pockets of small average thickness. If required, pressurized lubricant can be introduced to the pocket area to achieve the desired press effect and speed.

REFERENCES:
patent: 4518460 (1985-05-01), Hauser et al.
patent: 4568423 (1986-02-01), Laapotti
patent: 4570314 (1986-02-01), Holik et al.
patent: 4661206 (1987-04-01), Heitmann et al.
patent: 4917767 (1990-04-01), Ilmarinen et al.

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