Patent ID: 7429307

Claim:
A method of forming a layered fibrous web comprising the steps of: (a) leading at least two different fiber suspensions through a head box; (b) arranging at least one blade device to separate the at least two fiber suspensions from each other and to be freely movable in a substantially vertical direction in order to permit an equalization of pressure between the at least two fiber suspension layers separated by the at least one blade device and thereby reducing wake effects downstream of an outlet end of the at least one blade device; (c) forming at least one layer of water having a transversely uniform flow at the outlet end of the at least one blade device, such that the at least one layer of water constitutes an extension of the at least one blade device to separate and thereby prevent mixing of the at least two fiber suspensions; and (d) supplying the at least two fiber suspensions with the water therebetween to a web forming device.