| 摘要 |
PCT No. PCT/GB94/00028 Sec. 371 Date Nov. 7, 1994 Sec. 102(e) Date Nov. 7, 1994 PCT Filed Jan. 7, 1994 PCT Pub. No. WO94/16131 PCT Pub. Date Jul. 21, 1994In a method of and machine for forming a non-woven bias yarn assembly comprising two superposed non-woven bias yarn sub-assemblies each yarn is transferred by a yarn transfer member from an opening it occupies in a yarn guide member to another opening in the yarn guide member in such a manner that each yarn is caused in a succession of forward transfer steps to follow the yarn preceding it from one opening to another along a non-intersecting path until the yarn at a first end opening in the path arrives at a second end opening in the path located at the opposite end of the path and the yarn at the second end opening in the path arrives at the first end opening and then in a succession of return transfer steps to follow the yarn preceding it from one opening to another along the non-intersecting path in the opposite direction until the yarn from the second end opening in the path arrives at the first end opening and the yarn from the first end opening arrives at the second end opening. The forward and return transfer steps are then successively repeated. A three dimensional yarn structure is also disclosed comprising a non-woven first yarn assembly which has a first face and an opposite second face and which comprises two or more superposed non-woven warp yarn sub-assemblies in which the warp yarns of one sub-assembly are inclined to the warp yarns of the other sub-assembly and in both of which the warp yarns are inclined to a reference warp feed direction. |
