Method of forming a fibrous web

Details Method of forming a fibrous web Method of forming a fibrous web

2002-12-03

2008-09-30

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

C162S343000, C162S336000, C162S125000

Reexamination Certificate

active

07429307

ABSTRACT:
In a method of forming a layered fibrous web, the method includes the steps of leading at least two different fiber suspensions through a head box (10), separating the fiber suspensions from each other by a blade device (18, 180), supplying the fiber suspensions to a web forming device (24) and forming a water layer having a transversely uniform flow at an outlet at the end of the blade device (18, 180), such that the water layer constitutes an extension of the blade device and thereby prevents mixing of the fiber suspensions. The blade device (18, 180) can be freely movable in a substantially vertical direction in order to permit an equalization of pressure between the fiber suspension layers separated by the blade device and thereby reducing wake effects downstream the edge of the blade device. A paper machine for carrying out the method is also disclosed.

REFERENCES:
patent: 3923593 (1975-12-01), Verseput
patent: 4376014 (1983-03-01), Bergstrom
patent: 5204009 (1993-04-01), Rowland
patent: 6471828 (2002-10-01), Ruf et al.
patent: 2107751 (1983-05-01), None
patent: WO 82/03413 (1982-10-01), None

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