D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/15.3
D21F 1/00 (2006.01) D21F 3/02 (2006.01)
Patent
CA 1229009
ABSTRACT OF THE DISCLOSURE A pressing method and apparatus for dewatering a fibre web, such as a paper or cardboard web, in a paper machine press section including two press rolls through which the web is conducted carried on either a single fabric or interposed between a pair of fabrics. The web is pre-pressed in a pre-pressing zone located in the throat region between the press rolls. The pre-pressing pressure is applied to the web through the mediation of a substantially impermeable band which passes through the press nip in overlying relationship with the web as the latter is conducted over a sector of one of the press rolls. After the pre-pressing step, the web is immediately conducted through the zone of the press nip, the press- ing of the web which takes place in the press nip determining the dry matter content of the web subsequent thereto. The pre-pressing zone immediately precedes the zone of the press nip 90 that the pre- pressing and nip zones together in combination constitute a pressing zone. The peak pressing pressure present in the press nip zone is greater than the pressure in the preceding pre-pressing zone.
427758
Marks & Clerk
Valmet Oy
LandOfFree
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