tier at 11 a single endless fabric 14 passes in serpentine fashion around the first upper cylinder down around the first lower cylinder up around the second upper cylinder down around the second lower cylinder and so on then it passes around a return roll 16 a guide roll 24 a tensioning roll 23 a steam heated dryer roll 17 and other return rolls 16 as shown the paper web 13 is introduced under the fabric at the first upper cylinder and follows the fabric passing between it and the upper cylinders and outside the fabric at the lower tier cylinders it will be seen that in respect to the fabric because of the thickness of the paper web the effective diameter at the upper cylinders is now larger than the diameter at the lower cylinders by an amount equal to twice the thickness of the paper web fig3 shows generally at 30 a plain weave synthetic fabric structure of the prior art in which numeral 31 denotes consecutive warp strands and numeral 32 denotes consecutive weft strands in this structure each warp strand 31 passes over a first weft strand 32 under the second weft strand over the third and so on similarly the adjacent warp strand passes under the first weft strand over the second under the third and so on s 1 denotes the center to center distance between adjacent weft strands 32 in fig3 b.