Compound woven material, for the fourdrinier of a papermaking machine, has upper and lower warp layers with a structured weaving pattern with paired wefts at the upper side forming intermediate filament bridges with the lower layer

摘要

The compound woven fabric, has at least two layers (10,12) of separate warps (8) forming the upper (14) and lower (16) surfaces of the material. The wefts are woven at least into the layer of warps forming the upper side. To form the alternating bonding pattern (22) with the warps, at least one pair of support wefts (18,20) pass over the warps in a structured pattern. The compound woven fourdrinier material uses one weft (18) for a given number of warps, to give the passage over them in the weaving pattern, and the other weft (20) moves at least partially between the warp layers as a filament bridge (24) for a number of successive warps. The two wefts in each pair intersect at set points (26) so that the woven weft forms the bridge and back to the woven pattern. The alternating weaving pattern is formed by the two wefts in each pair covering each warp in the upper warp layer on the outer side. Where the paired wefts are not in the alternating weaving pattern, they are bonded with the warps of the lower warp layer. Additional bonding filaments (27) lock the two warp layers together. The support wefts are of different materials. The weaving pattern gives a weft bonding repeat structure at the upper side with eight, 10 or 12 warps.