| 主权项 |
1. A paper machine screen,
formed as a transverse thread-bound multi-layer fabric having an upper fabric layer comprising a first weave and a lower fabric layer comprising a second weave, wherein the multi-layer fabric has a total repeat which includes:
upper longitudinal threads which extend exclusively in the upper fabric layer,lower longitudinal threads which extend exclusively in the lower fabric layer,the ratio of upper longitudinal threads to lower longitudinal threads being 1:1,the lower longitudinal threads having a diameter which is greater than or equal to the diameter of the upper longitudinal threads,upper transverse threads which extend exclusively in the upper fabric layer and which are interwoven with the upper longitudinal threads, thereby partially forming the first weave,lower transverse threads which extend exclusively in the lower fabric layer and are interwoven with the lower longitudinal threads, thereby completely forming the second weave,wherein the lower transverse threads have a diameter which is greater than the diameter of the upper transverse threads, andbinding transverse threads which respectively extend both in the upper fabric layer and in the lower fabric layer and hereby bind the lower fabric layer to the upper fabric layer,wherein, within the total repeat, the binding transverse threads form functional transverse thread pairs of respectively two binding transverse threads arranged directly next to each other,wherein the two binding transverse threads of a respective functional transverse thread pair alternately complete the first weave and, in doing so, respectively extend over one or more upper longitudinal threads, thereby forming an imaginary upper transverse thread,wherein the two binding transverse threads of a respective functional transverse thread pair alternately bind the lower fabric layer with the second weave completely formed by the lower longitudinal threads and the lower transverse threads to the upper fabric layer by the respective binding transverse thread of a respective functional transverse thread pair extending under at least one lower longitudinal thread during its course in the lower fabric layer within the total repeat, andwherein, in the total repeat, the functional transverse thread pairs in the upper fabric layer are arranged in groups of respectively two or more functional transverse thread pairs arranged directly one after another, when seen in a longitudinal direction, wherein two successive groups are respectively separated from each other by one or two or more upper transverse threads. |
