Transversely stretchable stringer tape for slide fasteners
AssigneeYoshida Kogyo K. K.
InventorsYoshio Matsuda, Yoshiharu Yamaguchi
Life of this patent
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Abstract
A warp-knit stringer tape, for slide fasteners, including a pair of transversely non-stretchable longitudinal edge portions and a transversely stretchable intermediate portion extending therebetween. The stringer tape has a knit ground structure composed of chain stitches and tricot stitches. At the stretchable intermediate portion, the tricot stitches are formed of a plurality of elastic yarns such as stretch yarns, while the chain stitches are formed of a plurality of non-elastic yarns such as multifilament yarns. At least one elastic weft yarn is laid in the knit ground structure at the stretchable intermediate portion.
Claims21
A transversely stretchable stringer tape for a slide fastener having a pair of rows of coupling elements, comprising:
- (a) an elongate warp-knit web having a plurality of longitudinal wales disposed between a pair of longitudinal edges, said web including a pair of marginal portions extending along said pair of longitudinal edges, respectively, and an intermediate portion extending between said marginal portions, at least one of said marginal portions being non-stretchable for supporting therealong one coupling element row of the slide fastener;
- (b) said intermediate portion being transversely stretchable and including a plurality of yarns (hereafter called second yarns) forming a knit ground structure containing stitch loops, and at least one elastic yarn (hereafter called third yarn) laid in said knit ground structure and extending transversely across a plurality of adjacent ones of said wales, said second yarns being elastic and each extending across at least an adjacent pair of said wales, the number of the wales across which each said second yarn extends being smaller than the number of the wales across which said third yarn extends.
Dependencies are inferred from the claim text.