D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/06 (2006.01) D21F 1/66 (2006.01)
Patent
CA 2395232
The present invention relates to a method of and an apparatus for controlling the operation of the short circulation of a paper, paper board or the like production machine. The method and apparatus according to the invention are especially preferably suitable for use in the approach system, i.e. so-called short circulation, of said production machines for regulating the headbox feed pressure. A characteristic feature of the method and apparatus according to the invention is that at a suitable location in the approach system of said production machine there is arranged a controllable parallel flow, by means of which at least one flow in the approach system is regulated so that the pressure in the headbox remains essentially constant.
L'invention concerne un procédé et un dispositif permettant de commander le fonctionnement de la circulation courte d'une machine à papier, à carton ou à matériau analogue. Le procédé et le dispositif décrits dans cette invention sont tout particulièrement adaptés au système d'approche, c'est-à-dire à la circulation courte, de telles machines de production, afin de régler la pression d'alimentation de la caisse de tête. Le procédé et le dispositif décrits dans la présente invention se caractérisent en ce qu'un écoulement parallèle pouvant être commandé est ménagé à un emplacement approprié dans le système d'approche de ladite machine de production. Grâce à cela, au moins un écoulement, dans le système d'approche, est commandé de sorte que la pression à l'intérieur de la caisse de tête soit essentiellement constante.
Bjorkstedt Lasse
Matula Jouni
Andritz Oy
Gowling Lafleur Henderson Llp
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