Gap type forming section for a two fabric paper making machine

Details Gap type forming section for a two fabric paper making machine Gap type forming section for a two fabric paper making machine

D - Textiles, Paper

21

F

D21F 9/00 (2006.01) D21F 1/48 (2006.01) D21F 1/54 (2006.01)

Patent

CA 2544126

A twin fabric gap former forming section (1) for paper making machine is described in which: the pitch of the fabric support elements (26, 27, 28) decreases progressively in the machine direction; the level of vacuum applied to the forming fabrics (2, 4) through the dewatering boxes (11, 12, 13, 14), increases in the machine direction; the two forming fabrics (2, 4) together with the stock (7) sandwiched between them traverse at least four separate and distinct vacuum zones (24, 19, 20, 21, 22, 23) within the forming section as they proceed in the machine direction; the level of vacuum applied to the last of the at least four separate and distinct vacuum zones is higher than the level of vacuum applied to the first of the separate and distinct vacuum zones; the level of vacuum applied to the at least four separate and distinct vacuum zones follows a pre-selected profile; and the dewatering boxes (11, 12, 13) and (14) carrying the fabric support elements (26, 27, 28) are arranged so that the fabric support elements (26, 27, 28) are located in an alternating sequence on the machine sides of both of the forming fabrics (2, 4).

L'invention concerne une section de formage de type à intervalle à tissu double (1) pour machine à fabriquer le papier, dans laquelle: le pas des éléments de support des tissus (26, 27, 28) diminue progressivement dans le sens machine; l'intensité de la dépression appliquée sur les tissus de formage (2, 4) à travers les boîtes essoreuses (11, 12, 13, 14) augmente dans le sens machine; les deux tissus de formage (2, 4) et la pâte (7) prise en sandwich entre eux traversent ensemble au moins quatre zones de dépression séparées et distinctes (24, 19, 20, 21, 22, 23) à l'intérieur de la section de formage à mesure qu'ils avancent dans le sens machine; l'intensité de la dépression appliquée sur la dernière des quatre zones de dépression séparées et distinctes est supérieure à l'intensité de la dépression appliquée sur la première des zones de dépression séparées et distinctes; l'intensité de la dépression appliquée sur les quatre zones de dépression séparées et distinctes est fonction d'un profil présélectionné; et les boîtes essoreuses (11, 12, 13, 14) recevant les éléments de support des tissus (26, 27, 28) sont disposées en séquence alternée sur les côtés machine des deux tissus de formage (2, 4).

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