Metso Paper Inc.

Jaakko Jantunen

Erkki Ilmoniemi

Markku Ronnila

A headbox, for example, in a pulp or board machine, is suitable for high basis weights which are over 400 g/mand for high fiber suspension consistencies which are in a range of 2&#x2013;5%. The headbox has a turbulence part (), into which a fiber suspension flows from a tube bank (), and a slice part () which is situated after the turbulence part and from which the fiber suspension flows to a forming section of a fibrous web. The turbulence part () of the headbox has at least two passages (), which converge in the flow direction of the fiber suspension towards the slice part (). In that connection, the fiber suspension flow is first fluidized in a tortuous turbulence passage part () and, after that, it decelerates in another widening deceleration passage ().

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Karhula, Finland

Jaakko Jantunen