A METHOD OF PRODUCING A WOVEN ELONGATE FLEXIBLE TUBE

    公开(公告)号:EP3369849A1

    公开(公告)日:2018-09-05

    申请号:EP17159072.2

    申请日:2017-03-03

    摘要: There is disclosed a method of producing a woven elongate flexible tube (1) suitable for use in producing an inflatable safety belt (1) The method involving providing a plurality of yarns including at least one weft yarn (8) and a plurality of warp yarns (7), said plurality of warp yarns (7) including at least a first set of warp yarns (7a) and a second set of warp yarns (7b), wherein the warp yarns (7a) of said first set have a higher linear mass density than the warp yarns (7b) of said second set. The method furthermore involves simultaneously weaving a pair of plies (2,3) from said yarns (7, 8) in superimposed relation to one another and such that the plies (2,3) become interwoven and interconnected by a pair of transversely spaced-apart and substantially longitudinally-extending woven seams (4) between which said tube (1) is defined. Each ply (2,3) is woven from at least one said weft yarn (8) and a plurality of said warp yarns (7) drawn from both said first set (7a) and said second set (7b); and the weaving process involves: i) using warp yarns drawn solely from said first set (7a) to weave a central tensile load-bearing region (6) of each said ply (2,3), located between said seams (4); and ii) using warp yarns drawn solely from said second set (7b) to weave side regions (5) of each said ply (2,3) located on opposite sides of said tensile load-bearing region (6). A shedding process is used in which warp yarns of the first set (7a) are shed via a first shedding mechanism (25), and warp yarns of the second set (7b) are shed via a second shedding mechanism (26), the second mechanism being a Jacquard mechanism In some embodiments the first shedding mechanism (25) may be a Dobby mechanism.