De-watering apparatus in a two-wire former

Details De-watering apparatus in a two-wire former De-watering apparatus in a two-wire former

1992-04-22

1992-12-01

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162203, 162352, D21F 100

Patent

active

051677709

ABSTRACT:
The de-watering apparatus for a two-wire paper machine is constructed in such a manner that following the convergence of both wires, firstly, a uniform pressure at a forming roll is exerted on the suspension layer located between the wires. Subsequently, both wires pass de-watering rails which may be located in the upper and/or the lower wire. In this case, an under-pressure is exerted at least at the rails located in the upper wire. At least one further de-watering member then follows before both wires are separated again. The de-watering apparatus can also be used after a preliminary de-watering section, for example an endless wire, and also in the direct vicinity of a head box.

REFERENCES:
patent: 4414061 (1983-11-01), Trufitt et al.
patent: 4609435 (1986-09-01), Tissari
patent: 4769111 (1988-09-01), Nevalainen et al.
patent: 4917766 (1990-04-01), Koivuranta et al.
patent: 4925531 (1990-05-01), Koski
Baumann "New Top Wire Forming Unit", Pulp and Paper, Apr. 1989.

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