Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab

Daniel Söderberg

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 (), separating the fiber suspensions from each other by a blade device (), supplying the fiber suspensions to a web forming device () and forming a water layer having a transversely uniform flow at an outlet at the end of the blade device (), such that the water layer constitutes an extension of the blade device and thereby prevents mixing of the fiber suspensions. The blade device () 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.

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Åkersberga, Sweden

Daniel Söderberg