warp yarns on the second level which form the second ply web a 2 the next three are the group of warp yarns the group of warp yarns on the third level which form the third ply web a 3 and the uppermost three are the group of warp yarns the group of warp yarns on the fourth level which form the fourth ply web a 4 in addition the various second warp yarns 3 are passed through the second warp yarn passage holes 13b in the leno healds 13 of the second warp yarns 3 the bottom second warp yarn is the second warp yarn 3 1 for joining the first ply web a 1 and the second ply web a 2 the center second warp yarn is the second warp yarn 3 2 for joining the second ply web a 2 and the third ply web a 3 and the top second warp yarn is the second warp yarn 3 3 for joining the third ply web a 3 and the fourth ply web a 4 also for this embodiment the weft yarn guide mechanism 16 is provided with shuttles not shown in the drawings for the insertion of the weft yarns 2 into the shed openings of each ply each level after all of the above preparations are complete weaving begins in other words for the weaving.