Method and device achieving a flow of stock in a forming tank

D - Textiles – Paper – 21 – J

Patent

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Details

D21J 7/00 (2006.01)

Patent

CA 2239880

The invention relates to a method and an arrangement for producing a flow of stock in a moulding tank (1). In this, stock is pumped into the moulding tank (1) at the bottom (1a) and allowed to flow up over the brim (1b) thereof. During its rise in the moulding tank (1), the flow of stock pumped in is distributed by at least one grating placed essentially horizontally and provided with flow openings. An arrangement for performing the said method comprises a line (2a, 2b), connected to the moulding tank (1) and a machine vat for ready prepared stock, for delivering fresh stock to the moulding tank (1) by means of a pump (5) connecting with the line (2a, 2b). The line (2b) opens out in an area close to the bottom (1a) of the moulding tank (1) in such a way that an upwardly directed flow of stock is obtained. The pump (5) is adapted to deliver excess stock so that excess stock is allowed to flow over the brim (1b) of the moulding tank (1). At least one essentially horizontal grating (6, 7) provided with flow openings is arranged in the moulding tank (1).

L'invention se rapporte à un procédé et à un dispositif permettant de former un écoulement de pâte de papier dans une cuve de moulage (1). La pâte de papier est aspirée dans une pompe par le fond (1a) de la cuve de moulage (1) et s'écoule de manière ascensionnelle jusqu'au dessus du rebord (1b) de la cuve. Au cours de sa montée dans la cuve de moulage (1), l'écoulement de pâte aspirée passe par au moins une grille placée principalement horizontalement et poruvue de trous d'écoulement. Le dispositif permettant de réaliser ce procédé comprend une conduite (2a, 2b) raccordée à la cuve de moulage (1), et une machine à formes rondes destinée à la pâte prête à former, et servant à amener la pâte fraîche dans la cuve de moulage (1) au moyen d'une pompe (5) se raccordant à la conduite (2a, 2b). La conduite (2b) s'ouvre dans une zone proche du fond (1a) de la cuve (1) de façon à créer un écoulement de pâte dirigé vers le haut. La pompe (5) est adaptée de façon à faire paser la pâte excédentaire au-dessus du rebord (1b) de la cuve (1). Au moins une grille (6, 7) essentiellement horizontale pourvue de trous d'écoulement est disposée dans la cuve de moulage (1).

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