Patent ID: 7600538

Claim:
A seam fabric for a machine for producing a web of fibrous material, said seam fabric comprising: a basic structure configured for forming at least part of a belt having a plurality of belt longitudinal ends, said basic structure being formed as a seam cloth including a plurality of weft threads running in a belt longitudinal direction and a plurality of warp threads running in a belt transverse direction, said plurality of weft threads forming a plurality of seam loops, at least two weft thread layers, and a plurality of weft thread pairs, said plurality of seam loops being at said plurality of belt longitudinal ends and being configured for joining said plurality of belt longitudinal ends, said at least two weft thread layers including a first weft thread layer and a second weft thread layer, said plurality of weft thread pairs each including respectively one weft thread of said first weft thread layer and one weft thread of said second weft thread layer such that said one weft thread is a pair-wise assigned weft thread of said second weft layer, said plurality of weft thread pairs forming a plurality of groups of weft thread pairs including a first type of group and a second type of group which is different from said first type of group, in said first type of group of weft thread pairs one respective weft thread of said first weft thread layer lying offset in a first direction in relation to a respective said pair-wise assigned weft thread of said second weft thread layer when viewing said wefts of said first type of group in cross-section taken in said transverse direction, in said second type of group of weft thread pairs one respective weft thread of said first weft thread layer lying offset in a second direction inverse to said first direction in relation to a respective said pair-wise assigned weft thread of said second weft thread layer when viewing said wefts of said second type of group in cross-section taken in said transverse direction.