Headbox for a paper machine, board machine, pulp machine or...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/02 (2006.01)

Patent

CA 2408330

A headbox, for example, in a pulp or board machine, which headbox is suitable for high basis weights which are over 400 g/m2 and for high fibre suspension consistencies which are in a range of 2 - 5 %. The headbox includes a turbulence part (1), into which turbulence part a fibre suspension is coming from a tube bank (2), and a slice part (3) which is situated after the turbulence part and from which the fibre suspension flows to a forming section of a fibrous web. In accordance with the invention, the turbulence part (1) of the headbox comprises at least two passages (5, 6), which converge in the flow direction of the fibre suspension towards the slice part (3). In that connection, the fibre suspension flow is first fluidized in a tortuous turbulences passage part (5) and, after that, it decelerates in another widening deceleration passage (6).

L'invention concerne une caisse de tête utilisée dans une machine à carton ou dans un presse-pâte, par exemple, convenant pour des grammages élevés supérieurs à 400 g/m?2¿ et des consistances de suspension de fibres élevées comprises entre 2 et 5 %. Cette caisse de tête comprend une zone de turbulences (1) dans laquelle une suspension de fibres provient d'un faisceau de tubes (2), et une zone de règle (3) située en aval de la zone de turbulences et dans laquelle la suspension de fibres s'écoule vers une section de formation d'une toile fibreuse. Selon l'invention, la zone de turbulences (1) de la caisse de tête comprend au moins deux passages (5, 6) qui convergent dans le sens de l'écoulement de la suspension de fibres vers la zone de règle (3). La suspension de fibres est ainsi d'abord fluidisée dans une zone de passage (5) de turbulences puis elle ralentit dans un autre passage de ralentissement (6) à élargissement.

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