FORMING SCREEN FOR USE IN A PAPER MACHINE

摘要

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.