Twin-wire web former in a paper machine

Details Twin-wire web former in a paper machine Twin-wire web former in a paper machine

1992-03-13

1997-02-04

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162300, 162352, D21F 100

Patent

active

055994270

ABSTRACT:
The invention is related to a twin-wire web former in a paper machine having a covering wire and a carrying wire which form a twin-wire forming zone with one another. A discharge opening of a headbox feeds a pulp suspension jet into the forming gap defined between said wires. The forming gap is immediately followed immediately by a forming shoe provided with a curved guide deck. A draining unit or units is/are provided after the forming shoe, before the first forming roll. The draining unit/units comprise(s) a press/support unit which guides the wire placed in contact with it as a straight run. The draining unit or units further comprise(s) a draining equipment provided with suction and foil equipment and placed opposite to the press/support unit, which draining equipment removes a substantial amount of water out of the web.

REFERENCES:
patent: 3832282 (1974-08-01), Parker
patent: 3839143 (1974-10-01), Suckow
patent: 3992254 (1976-11-01), Lehtinen
patent: 4609435 (1986-09-01), Tissari
patent: 4769111 (1988-11-01), Nevalainen et al.
patent: 4790909 (1988-11-01), Harwood
patent: 4988408 (1991-01-01), Evalahti
patent: 5019214 (1991-05-01), Meinecke et al.
patent: 5215628 (1993-06-01), Koivuranta et al.
"Twin-wire Forming Special Report", Pulp & Paper, Sep., 1992, pp. 130-161.

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