Patent ID: 8631832

Claim:
Sheet forming screen, formed as a multi-layer fabric having an upper fabric layer (A) comprising a first weave, and a lower fabric layer (B) comprising a second weave, wherein the multi-layer fabric has a longitudinal thread repeat of sixteen longitudinal threads, four longitudinal threads ( 11 , 12 , 13 , 14 ) of which are formed as upper longitudinal threads extending exclusively in the upper fabric layer and being interwoven with transverse threads ( 101 to 120 , 101 to 112 ) extending in the upper fabric layer, thereby partially forming the first weave, eight longitudinal threads ( 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ) of which are formed as lower longitudinal threads extending exclusively in the lower fabric layer and there being interwoven with transverse threads ( 201 to 210 , 201 to 208 ) extending in the lower fabric layer, and the remaining four longitudinal threads ( 21 , 22 , 23 , 24 ) of which form two functional longitudinal thread pairs ( 21 , 22 ; 23 , 24 ) of two longitudinal threads each arranged next to each other, the two longitudinal threads of the respective longitudinal thread pair alternately completing the first weave, and one or more or all of the four longitudinal threads forming the two functional longitudinal thread pairs extending both in the upper fabric layer and in the lower fabric layer and thereby binding the lower fabric layer to the upper fabric layer.