Forming screen for use in a paper machine

Details Forming screen for use in a paper machine Forming screen for use in a paper machine

D - Textiles, Paper

21

F

D21F 1/10 (2006.01) D03D 9/00 (2006.01) D03D 25/00 (2006.01) D21F 7/08 (2006.01)

Patent

CA 2645700

The invention relates to a forming screen for use in the forming section of a paper machine, comprising a paper and a machine side as well as longitudinal threads ex-tending in the intended running direction and binding cross threads extending transversely thereto, wherein the longitudinal threads are divided in the ratio of the num-ber of threads of 1:1 in a longitudinal thread layer on the machine side and a longitudinal thread layer on the paper side, and the binding cross threads bind in both longitudinal thread layers, which is characterized in that the forming screen has a fiber support index (FSI) which is in the range of 230 to 250 and has an air perme-ability which is in the range of 5700 to 10600 m3/m2/h.

Cette invention se rapporte à un classeur à tamis de formation pour la section de formation d'une machine à papier. Ce classeur comprend un côté papier et un côté machine, ainsi que des filets longitudinaux dans le sens du défilement et des filets croisés, transversalement. les filets longitudinaux sont divisés selon le rapport du nombre de filets de 1 dans une couche de filets longitudinaux, côté machine, et dans une couche de filets longitudinaux, côté papier. Les filets croisés de liaison lient les deux couches de filets longitudinaux, avec pour caractéristique que le classeur à tamis de formation présente un indice de support de fibres (FSI) compris dans la plage de 230 à 250, et une perméabilité comprise entre 5 700 et 10 600 m3/m2/h.

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