| 摘要 |
A slide-fastener stringer has its turns (of continuous coil or meander coupling element) secured to its fabric support tapes by means of single-needle or double-needle double chain-stitch or lockstitch wherein bights of the needle thread straddle the coil turns and pass through the filler cords. The U-shaped bights of the needle-thread loops of each stringer half snugly embrace the individual turns and this thread is so tensioned that the looper or gripper thread lies completely along the opposite face of the support tape. The support tape is formed parallel to at least one of its longitudinal edges with a longitudinally extending valley or channel in which the looper, locking or gripper thread lies. In addition the upper side of the coil is formed with a longitudinally extending groove (formed by notches in the shanks of the turns) in which the needle thread lies. After stitching of the interleaved coils to the tapes the thermoplastic monofilament needle thread which has been stretched, is heated to thermally fix and shrink it. |
