Heated extended nip press with inlet support pocket

Details Heated extended nip press with inlet support pocket Heated extended nip press with inlet support pocket

1992-11-24

1994-04-12

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162206, 1623583, D21F 306

Patent

active

053022521

ABSTRACT:
An apparatus is provided for mechanical thermal dewatering of a web of fibrous material (1). The object is to provide a dewatering apparatus which delivers better drying results while precluding delamination of the web (1) of fibrous material. This is achieved in an apparatus in which the web of fibrous material is passed through at least two press surfaces (2, 3) which form a press gap and which exert the dewatering pressure on the web of fibrous material by forming one press surface (2) as an impermeable band (4) which can be pressed towards the other press surface (3) via a hydraulic pressing element means (15). A support pocket (5) is located in the pressing element essentially in the region between the web inlet end and the center of the pressing element means (15) and is effective to generate a hydrodynamic pressure field at the pressing element means (15) by setting a lubricant into circulation. The hydrodynamic pressure field provides the desired pressure characteristic as the web of paper material passes through the press zone.

REFERENCES:
patent: 4614565 (1986-09-01), Riihinen
patent: 4661206 (1987-04-01), Heitmann et al.
patent: 4738752 (1988-04-01), Busker et al.
patent: 4917768 (1990-04-01), Ilmarinen
patent: 4948466 (1990-08-01), Jaakkola
patent: 4973384 (1990-11-01), Crouse et al.
patent: 5071513 (1991-12-01), Bluhm
patent: 5110417 (1992-05-01), Lehtonen

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