Abstract:
A reflecting warp-knit slide fastener tape is knitted with several kinds of knitting patterns. A marginal portion onto which fastener elements are attached extends along one longitudinal edge of the tape. The marginal portion is formed by tricot-stitch yarns, weft-inlaid yarns, and chain-stitch yarns which prevent the marginal portion from stretching. In the web portion, in addition to the tricot-stitch yarns and the weft-inlaid yarns one or more reflective members, which is in the form of a strip of retroreflective or light-reserve reflective film, are knitted in between wales contiguous to the marginal portion. The reflective members are sandwiched between the weft-inlaid and tricot-stitch yarns. The tricot-stitch yarns are transparent synthetic fiber yarns in order not to obstruct the reflecting feature of the reflective members. The resulting reflecting portion is exposed to the front surface of the tape continuously along its entire length, giving a neat appearance particularly suitable for the dress and the traffic-safety clothing as well.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a tape for a slide fastener, and more particularly to a reflecting warp-knit slide fastener tape whose element-attaching marginal portion is restricted in warpwise stretchability by specifying the substances and individual warp-knitting patterns of knitting yarns and in which one or more reflective cords as of a light-reflective material are knitted in a portion contiguously inside of and along the element-attaching marginal portion. The presence of this resulting reflecting portion can be seen even from a distant place as It reflects light illuminated especially at night. 
     2. Description of the Related Art 
     Japanese Utility Model Laid-Open Publication No. Sho 63-135390 discloses a slide fastener tape in which a retroreflecting sheet is attached to a local portion of the tape surface. Republic of China Patent No. 284984 discloses a retroreflecting slide fastener tape in which a retroreflective strip is knitted contiguously to and along an element-attaching marginal portion by every several weft yarns so as to extend warpwise in a meandering pattern such as to be exposed alternately to front and rear surfaces of the tape. 
     In the retroreflecting slide fastener tape of the first-named publication, since the retroreflective sheet is attached to the front surface of the tape using an adhesive means, there is a fear that such retroreflective sheet might be peeled off the tape while the slide fastener is in use, so that an effective and reliable reflective feature cannot be retained for a long term, thus resulting in only an inadequate durability. 
     In the retroreflecting slide fastener tape of the second-named publication, although the retroreflective strip would not be peeled off the tape, the same retroreflective strip would tend to suffer possible damages, if exposed to the front tape surface to an elongated extent, as the retroreflective strip is merely woven at regular distances by weft yarns. And if the retroreflective strip is exposed to the front tape surface to only a limited extent, it would be impossible to expect a continuous high-definition reflecting feature. Further, due to its relatively complex woven structure, the tape portion in which the retroreflective strip is woven would be thick and rigid. 
     SUMMARY OF THE INVENTION 
     With the foregoing problems in view, it is an object of the present invention to provide a reflecting warp-knit tape, for a slide fastener, which is thin and adequately flexible and in which various kinds of one or more reflective cords are sandwiched from their front and rear sides by knitting yarns without being peeled or removed off the tape after long-term use, giving a refined eye-catching design feature which is particularly suitable for an ornament of the dress and the traffic-safety clothing. Especially the tape of this invention has a feature that the reflecting portion are exposed to the front surface of the tape continuously along its entire length without being obstructed by the knitting yarns. 
     According to a first aspect of the invention, the above object is accomplished by a reflecting warp-knit tape for a slide fastener having a plurality kinds of warp-knit structures, comprising: a longitudinal web portion; and an element-attaching marginal portion extending contiguous to and along a longitudinal edge of the web portion. The element-attaching marginal portion has a knit structure which is longitudinally non-stretchable. The web portion has a reflecting portion composed of at least a reflective member made of reflective material. 
     In the present invention, “knitting of the reflecting member” inclusively means “forming a wale directly by the reflecting member itself which serves as a knitting yarn while forming a succession of stitches of the reflecting member” and “merely laying the reflecting member between adjacent wales so as to hold the reflecting member at its front and rear sides by other knitting yarns”. 
     With this arrangement, since the reflective members are knitted in the web portion simultaneously with the knitting of the warp-knit tape, it is possible to secure adequate flexibility of the warp-knit tape and also to attach the reflective members to the tape in a stabilized posture without being peeled or removed off the tape, comparing to the case where the reflective members are adhered or sewn onto the web portion. 
     According to a second aspect of the invention, the reflecting portion is formed by knitting the reflective member adjacent to an inner side of the longitudinal edge of the marginal portion of the web portion to extend substantially parallel to the element-attaching marginal portion. With this arrangement, the reflective member is knitted in contiguous to and along the marginal portion of the fastener element row that is the least stretchable and the most eye-catchable position. It is therefore possible to maintain the reflective members in their knit structure as any unnecessary stress would not be exerted on the reflective members knitted in the warp-knit tape and to surely appeal the existence of the reflective members. 
     According to a third aspect of the invention, the reflecting portion is formed by knitting the reflective member weftwise centrally in the web portion and extends longitudinally thereof, so that the position of the reflective members with respect to the fastener elements would not be different even if the fastener elements are mounted on either one of opposite marginal portions of the warp-knit tape, thus facilitating attaching the fastener elements, managing production of warp-knit tapes and maintenance as well. 
     According to a fourth aspect of the invention, wales of the web portion located at opposite sides of the reflecting portion are bulkier than the remaining wales, so that the reflective members are protected by their adjacent bulky wales from being touched by other things. 
     According to a fifth aspect of the invention, the reflective member formed of a strip of reflective film is knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns. With this arrangement, even though each reflective member is thin and narrow, since there disposed several reflective members together, the reflective members can be easily observed by naked eyes even from a distant place. And also, the reflective members fitted in the interwale spaces would hardly be displaced sideways as they restricts each other&#39;s movement. 
     According to a sixth aspect of the invention, the reflective member formed of a strip of reflective film is knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns, and the knitting yarns have different knitting patterns, so that a front surface of the reflective member can be sandwiched from its front and rear sides by the plurality of knitting yarns. Therefore, the reflective member are held firmly from the front and rear sides by the knitting yarns and are free from becoming wavy or puckered toward the front and/or rear sides. 
     According to a seventh aspect of the invention, the reflective member is knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns, and those of the knitting yarns exposed over a front surface of the reflective member are transparent thermoplastic synthetic fiber yarns. Since a transparent material is used for the knitting yarn to hold the reflective members, it is possible to secure the reflection performance of the reflecting members so that no influence on the eye-catching feature would occur even in the case that the front surfaces of the reflective members are sandwiched by the plurality of knitting yarns. Further, since the transparent knitting yarns may be located only in the interwale space, in which the reflective member is placed, rather than the entire tape width, it is possible that its flexibility would not be lost, unlike the woven tape. 
     According to an eighth aspect of the invention, the reflective member formed of a strip of reflective film is knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns, and the knitting yarns have a knitting pattern to extend parallel to courses of the web portion so that the front surface of the reflective member is held by the knitting yarns extending parallel to the courses. Such arrangement of the knitting yarns enables the reflecting surface of the reflective member to expose effectively. 
     According to a ninth aspect of the invention, each of the reflective members is formed of a narrow strip of retroreflective or light-reserve reflective film knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns. It is therefore possible to simply knit the reflecting portion by using the strip of retroreflective or light-reserve reflective film and to expose the reflecting portion continuously with ease, thus improving an ornamental feature and giving an excellent reflection feature. 
     According to a tenth aspect of the invention, the reflective member is in the form of a narrow strip of foil or a yarn, of silver or gold, or is composed of a core cord of a thermoplastic synthetic fiber yarn and a narrow strip of retroreflective film wound around the core cord, and each reflective member is knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns. With this arrangement, it is possible to easily manufacture the knitting yarn on which the retroreflective film is wound as the reflective member and a high-definition reflecting portion can be formed, thus realizing an excellent reflection feature of the warp-knit tape. 
     An eleventh aspect of the invention, a plurality kinds of the reflective members are each knitted in to be located between adjacent wales and to be held by and sandwiched between other knitting yarns, and the other knitting yarns are two or more knitting yarns of different kinds. In this arrangement, different kinds of materials and structures are used for the reflective member and the holding knitting yarns, thus respective characteristics show in synergy and complement one another, and improved eye-catchability and durability as a whole can be guaranteed. 
     According to a twelfth aspect of the invention, the reflective member is a knitting yarn composed of a core cord of a thermoplastic synthetic fiber yarn and a narrow strip of retroreflective film wound around the core cord, and each knitting yarn forms a wale. 
     According to a thirteenth aspect of the invention, the reflective member which is in the form of a yarn or thread is used as a yarn constituting the web portion, and the reflective member is knitted directly as the knitting yarn so as to form a wale. In this structure, the individual reflective member is attached to the web portion integrally and tightly without a sense of incompatibility with the other knitting yarns, thus stabilizing the posture of the reflective member and increasing the durability to a remarkable extent. Further, since the reflective members are used as the knitting yarns forming the wales, it is possible to expose the individual reflective member continuously with no interruption warpwise along its entire length, thus improving the eye-catchability as compared to the foregoing fifth to eleventh aspects of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other objects, advantages and features of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which: 
     FIG. 1 is a fragmentary diagram of a reflecting warp-knit tape, for a slide fastener, according to a first embodiment of the present invention, showing a detailed warp-knit structure of the tape; 
     FIG. 2 is an enlarged, fragmentary diagram of the warp-knit tape of FIG. 1; 
     FIG. 3 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a second embodiment; 
     FIG. 4 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a third embodiment; 
     FIG. 5 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a fourth embodiment; 
     FIG. 6 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a fifth embodiment; 
     FIG. 7 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a sixth embodiment; 
     FIG. 8 is an enlarged, fragmentary diagram showing a modified reflecting warp-knit tape of FIG. 7; 
     FIG. 9 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a seventh embodiment; 
     FIG. 10 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to an eighth embodiment; 
     FIG. 11 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a ninth embodiment; 
     FIG. 12 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a tenth embodiment; 
     FIG. 13 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to an eleventh embodiment; 
     FIG. 14 is an enlarged, fragmentary diagram of a reflecting warp-knit tape according to a twelfth embodiment; 
     FIG. 15 is a cross-sectional view of a strip of retroreflective film; 
     FIG. 16 is an enlarged, fragmentary front view of a reflective member wound with the retroreflective film strip; and 
     FIG. 17 is an enlarged transverse cross-sectional view of a strip of light-reserve reflective film. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The principle of the present invention is particularly useful when applied to a reflecting warp-knit tape for a slide fastener, various preferred embodiments of which will now be described with reference to the accompanying drawings. 
     FIGS. 1 and 2 show a reflecting warp-knit tape  1 , for a slide fastener, which has a plurality of kinds of knit structure according to a first embodiment of the invention. The warp knit tape  1  comprises a continuous length of adequately flexible central web portion  3  and a pair of marginal portions  2  disposed contiguous to and extending one along each of opposite longitudinal edges of the central web portion  3 . In a subsequent step of the manufacture of slide fasteners, a row of fastener elements are attached to a selected one of the two marginal portions  2  such as by sewing; accordingly, either marginal portion may serve to support the fastener element row E and is hence hereinafter called the element-attaching marginal portion. As a pivot characteristic feature of the present invention, the web portion  3  includes a reflecting portion  4  provided by knitting at several wales inwardly of one of the element-attaching marginal portions  2 . 
     The warp-knit tape  1  of this embodiment is a simple tape entity devoid of a fastener element row to be mounted on it by knitting. The first to eighth wales W 1 -W 8  of the warp-knit tape  1  has a warp-knit structure shown in FIG.  2 . The warp-knit tape  1  is composed of thermoplastic synthetic fiber yarns in the form of monofilaments or multifilaments, as of polyamide, polyester, etc., as knitting yarns. With each of all wales W 1 -W 18  of the warp-knit tape  1 , a plurality of tricot-stitch yarns  6  having a knitting pattern of 1-2/1-0 and a plurality of weft-inlaid yarns  7  having a knitting pattern of 0-0/4-4 are interlooped or interlaced, and further in each of wales W 1 -W 4 , W 15 -W 18 , a chain-stitch yarn  5  is knitted in a pattern of 1-0/0-1 which fairly restricts longitudinal stretchability of the knitted foundation. The fastener elements E are sewn onto the knitted foundation with a sewing thread or the like. In this embodiment, narrow strips of retroreflective films  13  are used as reflective members  12 . 
     A pair of reflecting members  12 , each in the form of a narrow strip of retroreflective film  13 , are located adjacent to each other and between the fifth and sixth adjacent wales W 5 -W 6  and the sixth and seventh adjacent W 6 -W 7 , respectively. The weft-inlaid yarns  7  are arranged on the rear side of the web portion  3  and the tricot-stitch yarns  6  are arranged on the front side of the web portion  3 , thus sandwiching the retroreflective films  13 . Further, the tricot-stitch yarns  6 , which are exposed over the front surfaces of the retroreflective films  13 , are thermoplastic synthetic fiber yarns of transparent monofilament or multifilament yarns. As a result, the continuous reflecting portion  4  is formed in the web portion  3  contiguous to and along one of the element-attaching marginal portions  2 . Alternatively, the reflective member  12  may be in the form of a core cord or yarn with a retroreflective film  13  wound around it. As another alternative reflective member  12 , a thermoplastic synthetic fiber yarn may be dyed as with a fluorescent dye. 
     For a narrow strip of retroreflective film  13  as the reflective member  12 , as shown in FIG. 15, firstly a polyester resin substrate  14  is coated with metal such as aluminum, silver or copper by vapor deposition, plating or painting to form a reflecting coating  15 , and the reflecting coating  15  is then covered with a polyvinylbutyral resin adhesive layer  16 , whereupon an uncountable number of glass beads  17  are adhered to the adhesive layer  16 . Finally the resulting reflecting film sheet is cut into narrow strips. A transparent covering layer may be formed over the entire glass-bead-adhered-side surface of this recurrent reflective film  13 . 
     As still another alternative retroreflective film  13 , as shown in FIG. 16, a narrow strip of retroreflective film  13  is wound around the circumferential surface of a core cord  18  in the form of a monofilament or multifilament synthetic fiber yarn as of polyamide or polyester. 
     As a further alternative reflective member  12 , a monofilament or multifilament synthetic fiber yarn as of polyamide or polyester is dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach to be used in the warp-knit tape  1 . 
     Yet alternatively, the reflective member  12  may be a narrow strip of light-reserve reflective film  20  as shown in FIG.  17 . In production, firstly a light-reserve pigment as of SrAl 2 O 4  is painted over a transparent polycarbonate resin substrate  21  to form a light-reserve layer  22 , and then a particular kind of ink, which is obtained by kneading titanium oxide in vanish as of acrylic resin, is painted over a front surface of the light-reserve layer  22  to obtain a reflecting layer  23 , whereupon the resulting light-reserve reflective film  20  is cut into narrow strips. As an additional alternative form, the narrow strip of light-reserve reflective film  20 , like the retroreflective film  13 , may be wound around a core cord as of a synthetic fiber yarn. 
     As a still further alternative reflecting member  12 , a foil spread of silver or gold is stuck to a sheet of high-quality Japanese paper and then the resulting silver- or gold-coated Japanese paper sheet is cut into narrow strips. Yet this narrow strip of silver- or gold-backed Japanese paper may be spun with one of various kinds of strings or filaments to form a silver or gold thread. 
     FIG. 3 shows a warp-knit tape  1  according to a second embodiment. In each of all wales W 1 -W 18  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1, a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and/or interlaced, thus restricting the entire warp-knit tape  1  in longitudinal stretchability. And each of between the fourth and fifth adjacent wales W 4 , W 5  and between the fifth and sixth adjacent wales W 5 , W 6 , a narrow strip of retroreflective film  13  or any other reflective member  12  is located and is held by the tricot-stitch yarn  6  and a plurality of weft-inlaid yarns  7  on its front and rear sides, respectively. The tricot-stitch yarns  6  exposed over the front surfaces of the reflecting members  12  such as the retroreflective films  13  are each a transparent thermoplastic synthetic fiber yarn. Thus the individual reflecting portion  4  is exposed to the front surface of the warp-knit tape  1  continuously along its entire length. 
     FIG. 4 shows a warp-knit tape  1  according to a third embodiment. In each of all wales W 1 -W 18  of this warp-knit tape  1 , a plurality of two-needle-stitch yarns  8  of 0-2/2-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and interlaced, respectively, thus restricting the entire warp-knit tape  1  in longitudinal stretchability of the warp-knit foundation. And between the fifth and sixth adjacent wales W 5 , W 6 , a narrow strip of retroreflective film  13  or any other reflective member  12  is located and is held by the two-needle-stitch yarn  8  and the plurality of weft-inlaid yarns  7  on its front and rear sides, respectively. The two-needle-stitch yarn  8  exposed over the front surface of the reflecting member  12  such as the retroreflective film  13  is a transparent thermoplastic synthetic fiber yarn. Thus the reflecting portion  4  is exposed to the front surface of the warp-knit tape  1  continuously along its entire length. Having this two-needle-stitch yarn  8 , the reflective member  12  such as the retroreflective film  13  can be held uniformly along its entire length. 
     FIG. 5 shows a warp-knit tape  1  according to a fourth embodiment. In each of all wales W 1 -W 18  of this warp-knit tape  1 , a plurality of weft-inlaid yarns  9  of 3-3/0-0 are interlaced with a chain-stitch yarn  5  of 1-0/0-1, thus restricting the entire warp-knit tape  1  in longitudinal stretchability of the warp-knit foundation. And each of between the fifth and sixth adjacent wales W 5 , W 6  and between the sixth and seventh adjacent wales W 6 , W 7 , a narrow strip of retroreflective film  13  or any other reflective member  12  is located. Such two reflective members  12  are held by a weft-inlaid yarn  9  of 3-3/0-0 and the plurality of weft-inlaid yarns  7  on their front and rear sides, respectively. And the fastener elements E are sewn onto one longitudinal edge of the tape  1 . The weft-inlaid yarn  9  holding the front surface of the reflecting member  12  such as the retroreflective film  13  are each a transparent thermoplastic synthetic fiber yarn. Thus the individual reflecting portion  4  is exposed to the front surface of the warp-knit tape  1  continuously along its entire length. 
     FIG. 6 shows a warp-knit tape  1  according to a fifth embodiment. In each of at least from the first to seventh wales W 1 -W 7  of this warp-knit tape  1 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and interlaced, respectively, and in each of the first to fifth wales W 1 -W 5 , a chain-stitch yarn  5  is interlooped and interlaced with the tricot-stitch yarns  6  and the weft-inlaid yarns  7 , respectively, thus restricting the warp-knit tape  1  in longitudinal stretchability of the warp-knit foundation. And between the fourth and fifth adjacent wales W 4 , W 5 , a narrow strip of retroreflective film  13  or any other reflective member  12  is located and the retroreflective film  13  is held by the tricot-stitch yarn  6  and the plurality of weft-inlaid yarns  7  on its front and rear sides, respectively. Also between the fourth and fifth adjacent wales W 4 , W 5 , an additional weft-inlaid yarn  10  of 0-0/2-2 is located over the retroreflective film  13  so as to cross the tricot-stitch yarn  6 . Both these tricot-stitch and weft-inlaid yarns  6 ,  10  exposed on the front surface of the reflecting member  12  such as the retroreflective film  13  are each a transparent thermoplastic synthetic fiber yarn. Thus the reflecting portion  4  is exposed to the front surface of the warp-knit tape  1  continuously along its entire length. The chain-stitch yarns  5  of the first wale W 1  and the fourth and fifth adjacent wales W 4 , W 5 , which are located on opposite sides of the reflective member  12 , may be each a large-size knitting yarn to increase especially the fourth and fifth wales W 4 , W 5  in volume than the remaining wales, thereby realizing protection of the reflective member  12 . 
     FIG. 7 shows a warp-knit tape  1  according to a sixth embodiment. In at least the first to sixth wales W 1 -W 6  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1 is knitted, and in each of the second to sixth wales W 2 -W 6 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/3-3 are interlooped and interlaced, respectively, with the chain-stitch yarn  5 . The chain-stitch yarn  5  of the first wale W 1  is larger in size than the remaining chain-stitch yarns  5 . And between the first and second adjacent wales W 1 , W 2  whose interwale space is expanded, one of various kinds of thick core cord  19 , which is composed of a plurality of synthetic fiber threads or filaments, is located and is held by a pair of symmetrically arranged weft-inlaid yarns  30  of 0-0/1-1 on its front and rear sides. Further, each of between the fourth and fifth adjacent wales W 4 , W 5  and the fifth and sixth adjacent wales W 5 , W 6 , a narrow strip of retroreflective film  13  or any other reflective member  12  is located and is held as being sandwiched by the tricot-stitch yarn  6  and the weft-inlaid yarns  7 , respectively. In addition to the tricot-stitch yarns  6 , additional weft-inlaid yarns  10  of 0-0/1-1 are located over the reflective members  12  as retroreflective film  13  so as to cross the tricot-stitch yarns  6 . Both these tricot-stitch and weft-inlaid yarns  6 ,  10  exposed on the front surface of the reflecting member  12  such as the retroreflective film  13  are each a transparent thermoplastic synthetic fiber yarn. Thus the reflecting portion  4  is exposed to the front surface of the warp-knit tape  1  continuously along its entire length. 
     On and along the thick core cord  19  laid in the one longitudinal edge of the warp-knit tape  1 , a row of fastener elements E may be molded of thermoplastic resin, such as polyamide, polypropylene or polybutyleneterephthalate, by injection molding means, or a row of metal fastener elements E may be mounted by pressing. 
     FIG. 8 shows a modified warp-knit tape  1  of FIG.  7 . This warp-knit tape  1  is identical in knit structure with that of the embodiment of FIG.  7 . In at least the first to sixth wales W 1 -W 6  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1 is knitted, and in each of the second to sixth wales W 2 -W 6 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/3-3 are interlooped and interlaced, respectively, with the chain-stitch yarn  5 . The chain-stitch yarn  5  of the first wale W 1  is larger in size than the remaining chain-stitch yarns  5 . And between the first and second adjacent wales W 1 , W 2  whose interwale space is expanded, one of various kinds of thick core cord  19 , which is composed of a plurality of synthetic fiber threads or filaments, is located and is held by a pair of symmetrically arranged weft-inlaid yarns  30  of 0-0/1-1 on its front and rear sides. Further, each of between the fourth and fifth adjacent wales W 4 , W 5  and the fifth and sixth adjacent wales W 5 , W 6 , a pair of narrow strips of retroreflective film  13  or a pair of any other reflective members  12  are located and are held as being sandwiched by the tricot-stitch yarn  6  and the weft-inlaid yarns  7 , respectively. In addition to the tricot-stitch yarns  6 , additional weft-inlaid yarns  10  of 0-0/1-1 are located over the pair of reflective members  12  such as the pair of narrow strips of retroreflective film  13  so as to cross the tricot-stitch yarns  6 . Thus a pair of parallel double-reflective-cord reflecting portions  4  are obtained, extending longitudinally along the entire length of the warp-knit foundation of the warp-knit tape  1 . 
     The number of reflective members  12  to be knitted in the warp-knit tape  1  as a single reflecting portion  4  should by no means be limited to two and may be more than two and less than many. As an alternative reflective member  12 , as shown in FIG. 16, a narrow strip of recurrent reflecting film  13  is wound around the circumferential surface of a core cord  18  of a thermoplastic synthetic fiber yarn and such wound core cords or strings, or silver or gold threads may be disposed in parallel. Each reflective member  12  may be composed of a cord formed by knitting or by braiding the wound core cord or string, or silver or gold threads. 
     FIG. 9 shows a warp-knit tape  1  according to a seventh embodiment. In each of the first to third wales W 1 -W 3  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1 is knitted, and only the chain-stitch yarn  5  of the first wale W 1  is larger in size than the remaining chain-stitch yarns  5 . And in each of at least the first to eighth wales W 1 -W 8 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/3-3 are interlooped and interlaced, respectively, with the chain-stitch yarn  5 . The tricot-stitch yarns  6  extending between the fifth and sixth adjacent wales W 5 , W 6  and between the sixth and seventh adjacent wales W 6 , W 7  are each composed of a reflective member  12  in the form of a knitting yarn in which a core cord  18  is in the form of a thermoplastic synthetic fiber yarn, and a narrow strip of retroreflecting film  13  is wound around the circumferential surface of the core cord  18 , as shown in FIG. 16, or a knitting yarn around which a narrow strip of light-reserve reflective film  20  is wound, as shown in FIG. 17, or each in the form of a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or each in the form of a silver or gold thread. 
     The kind of the knitting yarns to be used as the reflective members  12  each constituting a reflecting portion  4  should by no means be limited to tricot-stitch yarns and may be chain-stitch yarns, two-needle-stitch yarns, single-cord-stitch yarns or even mere weft-inlaid yarns, as long as they are located and knitted in and between a necessary number of wales. After all, the resulting reflecting portion  4  serves to produce a continuous reflecting feature along the entire length of the warp-knit tape  1 . 
     FIG. 10 shows a warp-knit tape  1  according to an eighth embodiment. In each of the first to third wales W 1 -W 3  of this warp-knit tape  1 , like the seventh embodiment of FIG. 9, a chain-stitch yarn  5  of 1-0/0-1 is knitted, and only the chain-stitch yarn  5  of the first wale W 1  is larger in size than the remaining chain-stitch yarns  5 . And in each of at least the first to eighth wales W 1 -W 8 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/3-3 are interlooped and interlaced, respectively, of the chain-stitch yarn  5 . Further, each of between the fifth and sixth adjacent wales W 5 , W 6  and between the sixth and seventh adjacent wales W 6 , W 7 , a reflective member  12  composed of a narrow strip of retroreflective film  13  or any other reflective member  12  is located and is held by a tricot-stitch yarn  6  and a plurality of weft-inlaid yarns  7 , respectively on its front and rear sides. In addition, the tricot-stitch yarns  6  of 1-2/1-0 extending between the fifth and sixth adjacent wales W 5 , W 6  and between the sixth and seventh adjacent wales W 6 , W 7  are each composed of the reflective member  12  in the form of a knitting yarn in which a core cord  18  is in the form of a thermoplastic synthetic fiber yarn, and a narrow strip of retroreflective film  13  is wound around the core cord  18 , or a knitting yarn around which a narrow strip of light-reserve reflective film  20  is wound, or each in the form of a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or each in the form of a silver or gold thread so that the continuous reflecting portions  4  can be formed. In the warp-knit tape  1  of this embodiment, since each reflecting portion  4  is constituted by combining the two different kinds of reflective members  12  in an overlapping relationship, it can produce a reflecting feature with maximum definition. 
     FIG. 11 shows a warp-knit tape  1  according to a ninth embodiment. In each of at least the first to sixth wales W 1 -W 6  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1 is knitted, and only the chain-stitch yarn  5  of the first wale W 1  is larger in size than the remaining chain-stitch yarns  5 . Yet in each of the second to sixth wales W 2 -W 6 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/3-3 are interlooped and interlaced, respectively, with the chain-stitch yarn  5  of 1-0/0-1. Between the first and second adjacent wales W 1 , W 2  whose interwale space is expanded, a selected one of various kinds of thick core cord  19 , which is composed of a plurality of synthetic fiber threads or filaments, is located and is held by a pair of symmetrically arranged weft-inlaid yarns  30  of 0-0/1-1 on its front and rear sides. For each of the chain-stitch yarns  5  extending in and along the fourth and fifth wales W 4 , W 5 , a reflective member  12  which is composed of a core cord  18  of a thermoplastic synthetic fiber yarn and a narrow strip of retroreflective film  13  wound around the core cord  18 , or composed of a knitting yarn and a narrow strip of light-reserve reflective film  20  wound around the knitting yarn, or a knitting yarn of a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or a silver or gold yarn is used so that a continuous reflecting portion  4  is formed. On and along the thick core cord  19  laid in the marginal portion of the warp-knit tape  1 , a row of fastener elements E may be molded of thermoplastic resin or a row of metal fastener elements E may be mounted, thus completing a continuous length of slide fastener stringer. 
     FIG. 12 shows a warp-knit tape  1  according to a tenth embodiment. In each of at least the first to seventh wales W 1  W 7  of this warp-knit tape  1 , a chain-stitch yarn  5  of 1-0/0-1, a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and/or interlaced to form the warp-knit foundation. In addition, a pair of analogous warp-inlaid yarns  11  of 0-0/0-0/0-0/1-1/1-1/1-1 are laid in and along the fifth and sixth adjacent wales W 5 , W 6 , respectively, using reflective members  12  each composed of a core cord  18 , which is in the form of a thermoplastic synthetic fiber yarn, and a narrow strip of retroreflective film  13  or a narrow strip of light-reserve reflective film  20  wound around the core cord  18 , as shown in FIG. 16, or each being a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or a silver or gold thread. Thus each warp-inlaid yarn  11  is interlaced with the chain-stitch yarn  5  of a respective one of the fifth and sixth wales W 5 , W 6  at every three courses. The chain-stitch yarns  5  and the tricot-stitch yarns  6  in the fifth and sixth adjacent wales W 5 , W 6  are transparent thermoplastic synthetic resin fiber yarns and, as a result, a pair of parallel continuous reflecting portions  4  are formed in the web portion  3  along the entire length of the warp-knit tape  1 . 
     FIG. 13 shows a warp-knit tape  1  according to an eleventh embodiment. In each of at least the first to seventh wales W 1  W 7  of this warp-knit tape  1 , like the tenth embodiment of FIG. 12, a chain-stitch yarn  5  of 1-0/0-1, a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and/or interlaced to form the warp-knit foundation. In addition, a pair of analogous warp-inlaid yarns  11  of 00/0-0/0-0/1-1/1-1/1-1 and 1-1/1-1/1-1/0-0/0-0/0-0, respectively, are laid in and along the fifth and sixth adjacent wales W 5 , W 6 , using reflective members  12  each composed of a core cord  18  of a thermoplastic synthetic fiber yarn and a narrow strip of retroreflective film  13  or a narrow strip of light-reserve reflective film  20  wound around the core cord  18 , or each being a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or a silver or gold thread. Thus each of the fifth and sixth wales W 5 , W 6  Of the pair of warp-inlaid yarns  11  are knitted symmetrically in a pattern of 0-0/0-0/0-0/1-1/1-1/1-1 and a pattern of 11/1-1/1-1/0-0/0-0/0-0 with the chain-stitch yarns  5  of 1-2/1-0, crossing each other at every three courses. The chain-stitch yarns  5  and the tricot-stitch yarns  6  in the fifth and sixth adjacent wales W 5 , W 6  are transparent thermoplastic synthetic resin fiber yarns. As a result, a pair of continuous uniform rather wide reflecting portions  4  are formed in the web portion  3  along the entire length of the warp-knit tape  1 . 
     FIG. 14 shows a warp-knit tape  1  according to a twelfth embodiment. In each of all wales W 1 -W 18  of this warp-knit tape  1 , a plurality of tricot-stitch yarns  6  of 1-2/1-0 and a plurality of weft-inlaid yarns  7  of 0-0/4-4 are interlooped and interlaced, respectively, and in each of the first to fourth wales W 1 -W 4  (right marginal portion  2 ) and fifteenth to eighteenth wales W 15 -W 18  (left marginal portion  2 ), a chain-stitch yarn  5  of 1-0/0-1 is interlooped and interlaced with the tricot-stitch yarn  6  and the weft-inlaid yarn  7 , respectively to form a warp-knit foundation. And each of between the eighth and ninth adjacent wales W 8 , W 9 , between the ninth and tenth adjacent wales W 9 , W 10  and between the tenth and eleventh adjacent wales W 10 , W 11  which are located centrally, a narrow strip of retroreflective film  13  as a reflective member  12  or any other reflective member  12  is located and is knitted to be held as being sandwiched by the tricot-stitch yarn  6  and the weft-inlaid yarn  7  on its front and rear sides, respectively. The tricot-stitch yarns  6  exposed over the front surfaces of the reflective members  12  such as the retroreflective films  13  are each a transparent thermoplastic synthetic fiber yarn. Thus a set of parallel three reflecting portions  4  are exposed to the front surface of the warp-knit tape  1  continuously along its entire length. 
     In a subsequent manufacturing step of the slide fastener production, a row of fastener elements are attached to one of the two marginal portions  2  such as by sewing; accordingly, either marginal portion  2 , i.e., either W 1 -W 4  or W 15 -W 18  may serve to support the fastener element row and is hence called the element-attaching marginal portion  2 . Therefore, the warp-knit tape  1  of the present invention can be used to manufacture either one of two opposite fastener stringers. 
     The warp-knit tape  1  of this invention should by no means be limited to the illustrated examples and its warp-knit structure may be composed of various knitting yarns in any optional combination; stitches of the individual knitting yarn may be either open stitches or closed stitches. Further, regarding the width of the warp-knit tape  1  and the location of the reflective member  12 , various changes or modifications may be made to meet the purpose of use. 
     Furthermore, the number of the reflective members  12  should by no means be limited to two and may be more than two and less than many. And the reflective members  12  to be knitted may be each composed not only of a core cord  18  of a thermoplastic synthetic fiber yarn and a narrow strip of retroreflective film  13  wound around the circumferential surface of the core cord  18 , as shown in FIG. 16, or of a knitting yarn and a narrow strip of light-reserve reflective film  20  wound around the knitting yarn, as shown in FIG. 17, or of a thermoplastic synthetic fiber yarn dyed with a fluorescent dye or fluorescent white dye or bleached with a fluorescent bleach, or of a silver or gold thread, disposed in parallel, but also of a cord formed by knitting or by braiding such wound cord, or silver or gold thread. 
     It is thus apparent that the present invention is not limited to the above embodiments but various other modifications or changes may be made without departing from the scope and spirit of the invention.