Fastener stringer and slide fastener

A fastener stringer comprising:

• a fastener tape that includes one or more weft threads and a plurality of warp threads, the fastener tape having a first tape-surface and a second tape-surface;
• and
• a coil-shaped element that is provided onto the first tape-surface of the fastener tape, the coil-shaped element including a series of unit structures, each unit structure including:
• a first leg that extends along the weft thread;
• a second leg arranged farther away from the weft thread than the first leg;
• an engaging head that couples the first leg and the second leg at a position outwardly of fastener tape;
• and
• a return portion that couples the first leg and a second leg of an adjacent unit structure at a position inwardly of fastener tape, wherein
• the plurality of warp threads includes:
• a plurality of first warp threads configured to repeat crossing the weft thread at first and second tape sides alternatively in a length direction of the fastener tape so as to form a tape texture on which the first legs are placed;
• a plurality of second warp threads configured to repeat crossing the weft thread at the first and second tape sides alternatively in the length direction of the fastener tape so as to form a tape texture on which the first legs are placed;
• and
• total N adjacent third warp threads arranged between the plurality of first warp threads and the plurality of second warp threads, each third warp thread being configured to repeat crossing over N second legs at a side of the first tape-surface and crossing over the weft thread at a side of the second tape-surface so as to tighten the coil-shaped element to the weft thread, said N indicating a natural number equal to or greater than 2, wherein
• each third warp thread includes an exposed portion that crosses over the weft thread between the first legs arranged adjacent in the length direction of the fastener tape and that is exposed at a side of the second tape-surface, and wherein
• as the total N adjacent third warp threads extend in the length direction of the fastener tape, the respective exposed portions of the N adjacent third warp threads appear at a side of the second tape-surface one-by-one alternately or one-by-one sequentially.

A fastener stringer comprising:

• a fastener tape that includes one or more weft threads and a plurality of warp threads, the fastener tape having a first tape-surface and a second tape-surface;
• and
• a coil-shaped element that is provided onto the first tape-surface of the fastener tape, the coil-shaped element including a series of unit structures, each unit structure including;
• a first leg that extends along the weft thread;
• a second leg arranged further away from the weft thread than the first leg;
• an engaging head that couples the first leg and the second leg at a position outwardly of fastener tape;
• and
• a return portion that couples the first leg and a second leg of an adjacent unit structure at a position inwardly of fastener tape, wherein
• the plurality of warp threads includes;
• a plurality of first warp threads configured to repeat crossing the weft thread at first and second tape sides alternately in a length direction of the fastener tape so as to form a tape texture on which the first legs are placed;
• a plurality of second warp threads configured to repeat crossing the weft thread at the first and second tape sides alternately in the length direction of the fastener tape so as to form a tape texture on which the first legs are placed;
• and
• 3 or more adjacent third warp threads arranged between the plurality of first warp threads and the plurality of second warp threads, each third warp thread bring configured to repeat crossing over 3 or more second legs at the side of the first tape-surface and crossing over the weft thread at the side of the second tape-surface so as to tighten the coil-shaped element to the weft thread, wherein a number of the adjacent third warp threads and a number of the second legs crossed by each adjacent third warp thread are equal, and wherein
• each third warp thread includes an exposed portion that crosses over the weft thread between the first legs arranged adjacent in a length direction of the fastener tape and that is exposed at the side of the second tape-surface, and wherein
• as the 3 or more adjacent third warp threads extend in the length direction of the fastener tape, the respective exposed portions of the 3 or more adjacent third warp threads appear at the side of the second tape-surface one-by-one sequentially.