JP7742818B2 - Zipper tape and zipper stringer - Google Patents

Description

This disclosure relates to fastener tapes and fastener stringers.

Patent Document 1 discloses a method of aligning the center of the core cord with the thickness of the knitted fabric by using the difference in tension between the single cord and tricot yarn (see page 4, lines 4-10, and Figure 2-4 of the document).

Patent Document 2 discloses that the core is fixed by ground weft yarns and fastening weft yarns (see Figures 1 and 2 of the document).

Japanese Utility Model Application Publication No. 55-148409 Special Publication No. 54-21781

In the case of Patent Document 1, a sufficient tension difference is achieved by combining a single cord and tricot yarn. However, in this case, the ground weave is pulled strongly by the tricot yarn loops in the wales located further outward from the core cord, which may cause the wales to partially (albeit slightly) overhang the tape further outward than the core cord. If such overhanging occurs, the attachment strength of the fastener element to the core cord of the fastener tape may be reduced.

The inventors of this application have discovered new issues that can arise when using tricot yarn as a tightening yarn.

A fastener tape according to one aspect of the present disclosure includes a warp-knitted tape base fabric having side edges extending in the warp direction, and at least one core cord inserted as a warp thread into the side edges of the tape base fabric. The at least one core cord is fixed to the side edges of the tape base fabric by at least one tightening thread. The side edges include a first wale located outward from the center of the at least one core cord and a second wale located inward from the center of the at least one core cord. The at least one tightening thread includes a predetermined tightening thread that turns around without forming a loop in the first wale and then forms a loop in which the ground yarn of the tape base fabric is entangled in the second wale.

In some embodiments, the at least one core cord includes a first core cord and a second core cord that are knitted separately. The at least one tightening yarn includes a first tightening yarn for the first core cord and a second tightening yarn for the second core cord. The first tightening yarn may be the specified tightening yarn. The second tightening yarn may be a weft-insertion yarn that oscillates by repeatedly reversing without forming a loop in both the first wale and another wale. The other wale may be a wale located more inward in the tape than the second wale. Additionally or alternatively, the oscillation amplitude of the second tightening yarn is wider than the oscillation amplitude of the first tightening yarn. Additionally or alternatively, in the first wale, the reversing portions of the first tightening yarn and the reversing portions of the second tightening yarn are formed alternately in the warp direction.

In some embodiments, no other loops are formed in the first wale except for the loops formed by the ground yarns of the tape base fabric; and/or
The first wale is the wale located furthest outward on the fastener tape; and/or the fastener tape has a sinker loop surface and a needle loop surface opposite thereto, and the specified fastening thread repeatedly contacts the at least one core cord on the sinker loop surface side and crosses the at least one core cord on the sinker loop surface side.

In some embodiments, the tape base fabric includes a plurality of chain stitches and a plurality of weft insertion yarns that oscillate with an oscillation width across different wales to connect the plurality of chain stitches. In the first wale, the reversal portion of the predetermined fastening yarn crosses the chain stitch yarn of the chain stitch and can be held by the chain stitch yarn.

The pitch of the fastening thread observed along the at least one core cord may be less than the pitch of the fastener elements relative to the fastener tape.

Any combination of the primary and secondary features described above is within the scope of the disclosure of this specification.

According to one aspect of the present disclosure, it is possible to avoid or suppress a decrease in the attachment strength of fastener elements to the side edge portions of a warp-knitted tape base fabric with a core cord.

1 is a front schematic view of a slide fastener according to one embodiment of the present disclosure. 2 is a schematic diagram showing the schematic configuration of a side edge portion of a fastener tape in the thickness direction and the schematic configuration of a fastener element. FIG. 1 is a schematic diagram showing the state in which fastener elements are engaged with each other, and also showing the state in which the core cord is fixed to the tape base fabric by the tightening thread at the side edge of the fastener tape. FIG. This is a schematic diagram showing a state in which the first and second core cords are fixed to the tape base fabric by the first tightening yarn (1/2 tricot yarn) and the second tightening yarn (weft-insertion yarn) (note that the weft-insertion yarn of the tape base fabric is not shown). For convenience of illustration, the chain stitch structure is shown by dotted lines. This is a schematic weave diagram showing the state in which the first core cord is fixed between the first tightening thread (1/2 tricot thread) and the tape base fabric (e.g., its weft-insertion thread) (note that the second tightening thread is not shown). This is a schematic weave diagram showing the state in which the second core cord is fixed between the second tightening thread (weft-inserted thread) and the tape base fabric (e.g., its weft-inserted thread) (note that the first tightening thread is omitted from the illustration). FIG. 10 is a reference diagram showing the configuration of a side edge portion of a fastener tape according to one embodiment of the present disclosure (note that the second tightening thread is omitted from the illustration). 10 is a schematic diagram showing a single core cord being fixed to a tape base fabric by first and second tightening threads. FIG. FIG. 10 is a schematic diagram showing a modified example in which the second binding yarn is also a 1/2 tricot yarn in addition to the first binding yarn.

Non-limiting embodiments and features of the present invention will be described below with reference to the drawings. Those skilled in the art will be able to combine the various embodiments and/or features without excessive explanation and will also be able to understand the synergistic effects of such combinations. Duplicate descriptions between embodiments will generally be omitted. The reference drawings are primarily intended to describe the invention and have been simplified for ease of illustration. Each feature is not limited to the fastener tape disclosed in this specification, but is understood to be a universal feature applicable to various other fastener tapes not disclosed in this specification.

In this specification, descriptions may refer to terms indicating directions such as the front-to-rear direction, the left-to-right direction, and the up-to-down direction. The front-to-rear direction corresponds to the direction of movement of the slider 9 for opening and closing the slide fastener 1, and corresponds to the longitudinal direction of the slide fastener 1 (or the fastener stringer 2 or fastener tape 3). The left-to-right direction is a direction perpendicular to the front-to-rear direction and corresponds to the width direction of the slide fastener 1 (or the fastener stringer 2 or fastener tape 3). The up-to-down direction is a direction perpendicular to the front-to-rear and left-to-right directions and corresponds to the thickness direction of the fastener tape 3. Of course, the up-to-down direction does not necessarily correspond to the vertical direction (direction of gravity). In other words, terms indicating directions referred to in this specification are understood based on the slide fastener 1 and are unrelated to the vertical direction (direction of gravity).

The structure of the slide fastener 1 will be described with reference to Figures 1 to 3. Figure 1 shows the slide fastener 1, with the left and right fastener stringers 2 engaged at their rear portions and disengaged at their front portions. Figure 2 shows the schematic structure of the thickness direction of the side edge of the fastener tape 3 in one of the fastener stringers 2, and the schematic structure of the fastener elements 4 attached to that side edge. Figure 3 shows the state in which the left and right fastener elements 4 are engaged with each other, particularly the state in which the first core cord 51 is fastened to the tape base fabric 33 by the first tightening thread 61.

The slide fastener 1 is a flexible, elongated member that extends longitudinally with a substantially constant width (the same applies to the fastener stringer 2 and fastener tape 3). The slide fastener 1 includes a pair of left and right fastener stringers 2, each including a fastener tape 3 and fastener elements 4, and a slider 9 for engaging and disengaging the fastener stringers 2. Each of the left and right fastener tapes 3 includes a warp-knitted tape base fabric 33 having side edges 38 extending in the warp direction, and at least one core cord inserted as a warp thread into the side edges 38 of the tape base fabric 33. The tape base fabric 33 is divided into a main body portion 37 for attaching the slide fastener 1 to an article and side edges 38 to which the fastener elements 4 are attached. As described below, at least one core cord is inserted between adjacent wales at the side edges 38 of the tape base fabric 33. By providing the core cord at the side edges 38 of the tape base fabric 33, the attachment strength of the fastener elements 4 to the fastener tape 3 is increased.

When the slider 9 moves forward, the left and right fastener elements 4 engage with each other, and the left and right fastener stringers 2 engage (to the extent that the left and right fastener elements 4 are engaged with each other). When the slider 9 moves backward, the left and right fastener elements 4 are disengaged, and the left and right fastener stringers 2 become disengaged (to the extent that the left and right fastener elements 4 are disengaged from each other). Note that the slide fastener 1 shown in the figure has a front stop and a rear stop, but both can be omitted. Whether the left and right fastener elements 4 can be completely separated generally depends on the presence or absence of a rear stop, and its type. The slider 9 is typically made of metal or resin, but is not limited to these materials.

The tape base fabric 33 has a first tape surface 31 and a second tape surface 32 opposite the first tape surface 31, and has a thickness defined thereby (see, for example, Figure 2). The tape base fabric 33 is made of knitted fabric and therefore has higher stretchability in the warp direction (front-to-back direction) compared to woven fabric. Advantageously, the first tape surface 31 includes a sinker loop surface over its entirety or a portion thereof (e.g., an area limited to the side edge portion 38), and the second tape surface 32 includes a needle loop surface over its entirety or a portion thereof (e.g., an area limited to the side edge portion 38). In this case, a single Russell knitting machine or a crochet knitting machine can be used as a warp knitting machine, improving productivity of the fastener tape 3.

The tape base fabric 33 can include various knitting structures. In some cases, the tape base fabric 33 includes multiple chain stitches that individually form wales, and multiple weft insertion yarns that oscillate with swing widths across different wales to connect the multiple chain stitches (see FIGS. 5 to 7). The number of wales included in the tape base fabric 33 can be set arbitrarily. For example, the tape base fabric 33 includes N wales _W1 to _Wn , where N and n are typically natural numbers equal to or greater than 5. The number of weft insertion yarns inserted into the tape base fabric 33 can also be adjusted arbitrarily. The swing widths of the individual weft insertion yarns can be set equal, but this is not necessarily the case.

At least one core cord is inserted as a warp thread into the side edge 38 of the tape base fabric 33 (see, for example, Figures 2 and 3). The at least one core cord is secured to the side edge 38 of the tape base fabric 33 by at least one tightening thread. Two separately knitted core cords (e.g., the first core cord 51 and the second core cord 52 shown in Figure 2) may also be inserted, and these core cords are secured to opposite surfaces of the tape base fabric 33 (i.e., the first tape surface 31 and the second tape surface 32) by two separate tightening threads (e.g., the first tightening thread 61 and the second tightening thread 62 shown in Figure 2). The two core cords are stacked directly in the thickness direction of the fastener tape 3, or are stacked with the weft-inserted thread of the tape base fabric 33 sandwiched between them. The two core cords may be of the same or different thicknesses and materials.

Explaining more specifically with reference to Figure 2, the side edge portion 38 of the tape base fabric 33 includes a first wale _W1 located outside the tape relative to the center CP of at least one core cord 5, and a second wale _W2 located inside the tape relative to the center CP of at least one core cord 5. A total of two core cords, a first core cord 51 and a second core cord 52, are inserted between the first wale _W1 and the second wale _W2 . The first core cord 51 is restrained between the first wale _W1 and the second wale _W2 by a first tightening thread 61 on the first tape surface 31 side. The second core cord 52 is restrained between the first wale _W1 and the second wale _W2 by a second tightening thread 62 on the second tape surface 32 side. In addition, the first core cord 51 and the second core cord 52 are each inserted as warp threads between the first wale _W1 and the second wale _W2 when weaving the tape base fabric 33, and are fixed to the tape base fabric 33 by the first tightening thread 61 and the second tightening thread 62.

The first wale _W1 is located further outward from the tape than the center CP of the core cord 5 (e.g., the center CP of the first core cord 51 and the second core cord 52), and is typically located at the outermost end of the tape in the course direction (i.e., the end in the course direction). The second wale _W2 is located further inward from the center CP of the core cord 5 (e.g., the center CP of the first core cord 51 and the second core cord 52), and is typically adjacent to the wale located outermost from the tape in the course direction. Note that the outer side of the tape refers to a direction from a point (or position) on either the first tape surface 31 or the second tape surface 32 that defines the thickness of the fastener tape 3, crossing (typically perpendicular to) the side edge 38 of the tape base fabric 33, toward a point (or position) outside that plane. The inner side of the tape is the direction facing opposite to the outer side of the tape.

When the ground yarn of the tape base fabric 33 (e.g., the weft-insertion yarn mentioned above) is present between the first core cord 51 and the second core cord 52, the first core cord 51 is sandwiched and held between the ground yarn of the tape base fabric 33 and the first tightening yarn 61. The second core cord 52 is sandwiched and held between the ground yarn of the tape base fabric 33 and the second tightening yarn 62. Note that this ground yarn of the tape base fabric 33 may be a weft-insertion yarn that oscillates between the first wale and another wale to support the core cord. When the ground yarn of the tape base fabric 33 is not present between the first core cord 51 and the second core cord 52, the first core cord 51 and the second core cord 52 come into direct contact above and below, and this contact continues in the warp direction. The first core cord 51 and the second core cord 52 are compressed between the first tightening yarn 61 and the second tightening yarn 62.

The fastener element 4 may be a metal or resin element attached to a core string provided on the side edge 38 of the tape base fabric 33 (see Figure 2). The fastener element 4 may have an attachment base 41 fixed to the core string provided on the side edge 38 of the tape base fabric 33, and an engagement portion 42 protruding from the attachment base 41 toward the outside of the tape. When the fastener element 4 is a resin element, the fastener element 4 includes an attachment base, neck, and engagement head, in this order, outside the tape, and is fixed to the side edge 38 of the tape base fabric 33 and the core string at the attachment base.

The mounting base 41 may have a first leg portion 41p and a second leg portion 41q that sandwich the fastener tape 3 in its thickness direction. The core cords (e.g., the first core cord 51 and the second core cord 52) are compressed in the tape thickness direction between the first leg portion 41p and the second leg portion 41q. The first leg portion 41p and the second leg portion 41q each extend from the engagement portion 42 toward the inside of the tape, crossing the first core cord 51 and the second core cord 52, and are provided with locking protrusions 41r and 41s at their tips. The locking protrusions 41r and 41s protrude toward each other in the tape thickness direction, thereby forming an opening 41j that sandwiches the tape base fabric 33 between them.

The engagement portion 42 has an engagement recess 42m and an engagement protrusion 42n, which are positioned away from the side edge 38 of the tape base fabric 33 toward the outside of the tape and are arranged on the same axis in a direction parallel to the side edge 38 (see Figures 1 and 3). When the left and right fastener elements 4 are engaged, the engagement protrusion 42n of the fastener element 4 on one side enters and engages with the engagement recess 42m of the fastener element 4 on the other side. This engagement between the fastener elements 4 is repeated in the front-to-rear direction, and the left and right fastener stringers 2 engage and close. Note that it is also within the realm of possibility to form engagement protrusions on both the front and rear surfaces of the engagement portion 42.

The first leg portion 41p, the second leg portion 41q, and the engaging portion 42 form the retaining portion 41k of the fastener element 4, which retains the core cords (e.g., the first core cord 51 and the second core cord 52) provided at the side edge portion 38 of the tape base fabric 33. The retaining portion 41k is defined by at least the inner wall surface of the first leg portion 41p, the inner wall surface of the second leg portion 41q, and the inner wall surface 42e of the engaging portion 42 extending in the vertical direction to connect these inner wall surfaces. The inner wall surface of the first leg portion 41p faces or contacts the first tape surface 31. The inner wall surface of the second leg portion 41q faces or contacts the second tape surface 32. The inner wall surface 42e of the engaging portion 42 extends along the tape thickness direction and faces the opening 41j between the locking projections 41r, 41s (which is actually completely or substantially occupied by the fastener tape 3). The first core cord 51 is positioned and compressed between the locking protrusion 41r and the inner wall surface 42e. Similarly, the second core cord 52 is positioned and compressed between the locking protrusion 41s and the inner wall surface 42e. Note that although Figure 2 shows a gap between the retaining portion 41k and the side edge 38 of the tape base fabric 33, in reality the fastener element 4 is attached so that there is no or almost no gap.

3, the first wale _W1 of the tape base fabric 33 may protrude outward from the tape more than the core cords (for example, the first core cord 51 or the second core cord 52). It is not desirable for the first wale _W1 to protrude outward from the tape to a large extent. This is because the fastener element 4 is usually designed without considering the extent to which the first wale _W1 protrudes outward from the tape, and the attachment strength of the fastener element 4 to the fastener tape 3 may be reduced due to contact between the inner wall surface 42e of the engaging portion 42 and the first wale _W1 .

In the present disclosure, at least one core cord is fixed to the side edge of the tape base fabric by at least one tightening yarn. This at least one tightening yarn includes a predetermined tightening yarn (see first tightening yarn 61 in FIG. ₄ ) that turns over without forming a loop in the first wale W1 and then repeatedly forms a loop in which the ground yarn of the tape base fabric is entangled in the second wale _W2 . This reduces the extent and/or extent to which the first wale _W1 protrudes outward from the first core cord 51. Furthermore, because the tightening yarn forms a loop in which the ground yarn of the tape base fabric is entangled in the second wale _W2 , fraying of the tightening yarn is also suppressed. Note that in this specification, the predetermined tightening yarn may be simply referred to as a 1/2 tricot yarn. Typically, tricot yarns form a loop at one end of their swing range and also at the other end. 1/2 tricot yarns form a loop at one end of their swing range and do not form a loop at the other end. Therefore, the term "1/2" is added before "tricot" to distinguish between the two.

4 and 5, the first tightening yarn 61 does not form a loop in the first wale _W1 that entangles the ground yarn of the tape base fabric 33, and therefore the ground yarn of the first wale _W1 (e.g., the chain stitch yarn shown in the figure) is not strongly pulled by the first tightening yarn 61. As a result, a recess that is locally recessed inward in the tape is formed in the first wale _W1 , and the reaction to this is prevented from causing a local protrusion that protrudes outward in the tape. Thus, a decrease in the attachment strength of the fastener element 4 to the fastener tape 3 is prevented. Note that although the first tightening yarn 61 does not form a loop in the first wale _W1 , it is held down to the first wale _W1 by the ground yarn that forms the first wale _W1 (e.g., the chain stitch yarn shown in the figure), and therefore can function as a tightening yarn.

More specifically, the first tightening yarn 61 oscillates between the first wale _W1 and the second wale _W2 , straddling the first core cord 51 along the course direction. In this process, the first tightening yarn 61 forms a turn-around portion 611 in the first wale W1 and a loop 612 in _the second wale _W2 . The turn-around portion 611 does not include a loop in which the ground yarn of the tape base fabric 33 is entangled, and crosses the chain stitch yarn of the first wale _W1 at two points and is held thereby. The loop 612 forms a bundled loop (more specifically, an open loop) with the loop of the chain stitch yarn in the second wale _W2 , and the chain stitch yarn is entangled with this loop 612. After forming a certain loop (a predetermined loop), the chain stitch yarn is entangled with the loop 612 of the first tightening yarn 61 at the portion where it entangles with the previous or earlier formed loop (i.e., the loop immediately adjacent to the rear of the predetermined loop).

In the first wale _W1, it is preferable that no loops be formed except for those formed by the ground yarns (e.g., chain stitch yarns) of the tape base fabric 33. For this purpose, it is preferable that the second fastening yarn 62 be a weft insertion yarn that oscillates by repeatedly reversing without forming loops in both the first wale _W1 and other wales. In the case shown in Figures 4 and 6, the second fastening yarn 62 is a weft insertion yarn that oscillates by repeatedly reversing without forming loops in the first wale _W1 and in the third wale _W3 . More specifically, in the first wale _W1 , each reversing portion 621 of the second fastening yarn 62 crosses the chain stitch yarn of the first wale _W1 at two points and is held thereby. In the third wale _W3 , each reversing portion 621 of the second fastening yarn 62 crosses the chain stitch yarn of the third wale _W3 at two points and is held thereby. In the second wale _W2 , the second fastening yarn 62 is held across the chain stitch yarn of the second wale _W2 .

The oscillation width of the second tightening thread 62 may be wider than that of the first tightening thread 61. For example, the first tightening thread 61 oscillates with an oscillation width equal to the width of two wales, the first wale _W1 and the second wale _W2 , and the second tightening thread 62 oscillates with an oscillation width equal to a wider wale width (a width corresponding to three wales in FIG. 4 ). This prevents the second wale W2, in which the first tightening thread 61 forms a loop, from having a relatively high thread density and becoming relatively stiff. Furthermore, by forming a reversal portion 621 of the second tightening thread ₆₂ in a wale (e.g., the third wale) that is farther inward from the second wale _W2 , the resistance to sliding friction of the slider 9 can be increased. Note that, in the first wale _W1 , if the reversal portions 611 of the first tightening thread 61 and the reversal portions 621 of the second tightening thread 62 are alternately formed in the warp direction, the change in thickness of the first wale _W1 along the warp direction can be suppressed. Furthermore, by not providing a course in which only the ground yarn (chain stitch yarn) exists, the fastener element 4 is attached to the fastener tape 3 in a stable manner.

Preferably, the first tape surface 31 is a sinker loop surface, and the second tape surface 32 is a needle loop surface. The first tightening yarn 61 repeatedly contacts the core cord on the sinker loop surface side and crosses the core cord on the sinker loop surface side. The second tightening yarn 62 repeatedly contacts the core cord on the needle loop surface side and crosses the core cord on the needle loop surface side. Because the first tightening yarn 61 is a 1/2 tricot yarn and the second tightening yarn 62 is a weft insertion yarn, the first tightening yarn 61 has a higher tension than the second tightening yarn 62, and therefore the degree to which the core cord (e.g., the first core cord 51) protrudes from the sinker loop surface is reduced. Note that in this context, the second core cord 52 protrudes relatively more from the needle loop surface than the first core cord 51, but due to the inherent unevenness of the needle loop surface, the impact on human vision is relatively small. Furthermore, since the first tightening thread 61 is a 1/2 tricot thread that forms loops only in the second wale _W2 , the tension is not as high as that of a normal tricot thread, and the core thread does not stand out more than the inherent unevenness of the needle loop surface.

When the knitted fabric of the tape base fabric 33 includes weft insertion yarns (for example, weft insertion yarns 71 to 73 in FIG. 5) in addition to the chain stitch structure, the reverse portion 711 of the weft insertion yarn 71 and the reverse portion 611 of the first tightening yarn 61 may be positioned in the same course in the first wale W ₁ (see FIG. 5). Alternatively, the reverse portion 711 of the weft insertion yarn 71 and the reverse portion 621 of the second tightening yarn 62 may be positioned in the same course in the first wale W _1. The weft insertion yarns 71 and 72 are threads that pass between the first core cord 51 and the second core cord 52.

Again, in this disclosure, a 1/2 tricot yarn is used as the first tightening yarn 61, which prevents the first wale _W1 from protruding outward from the first core cord 51. Referring to Figure 7, the first tightening yarn 61 forms a loop in a certain course of the second wale _W2 (because it is pulled by the same knitting needle in a crochet knitting machine or single Russell knitting machine) just like the chain stitch yarn, crosses the first core cord 51 toward the outside of the tape, turns around without forming a loop in the course above the first wale _W1 , and then crosses the first core cord 51 toward the inside of the tape. The first tightening yarn 61 repeats this process, and the first core cord 51 is fixed to the tape base fabric 33. In the first wale _W1 , the first tightening yarn 61 is held crossing the chain stitch yarn, but does not form a loop in which the chain stitch yarn is entangled. In the second wale _W2 , the first fastening yarn 61 forms a loop in the same way as the chain stitch yarn (because it is pulled by the same knitting needle in a crochet knitting machine or a single Russell knitting machine), and the chain stitch yarn becomes entangled with this loop. As a result, a double loop is formed in the second wale _W2 , so even if one of the loop yarns breaks due to wear caused by the sliding of the slider 9, the fastener tape 3 will not fray.

The second tightening yarn 62 forms an inverted portion 621 in the third wale _W3 , which is immediately adjacent to and on the inside of the tape relative to the second wale _W2 where the first tightening yarn 61 forms the inverted portion 611, crosses the second core cord 52 toward the outside of the tape, forms an inverted portion 621 in the first wale _W1 , and then crosses the second core cord 52 toward the inside of the tape. The second tightening yarn 62 repeats this process, and the second core cord 52 is fixed to the tape base fabric 33. In the first wale _W1 and the third wale _W3 , the second tightening yarn 62 is held crossing the chain stitch yarn, but does not form a loop in which the chain stitch yarn is entangled. Whether or not the yarns are entangled can be determined based on whether or not one yarn reverses its traveling direction in relation to the other yarn.

Finally, returning to Figure 3, the pitch interval P1 of the first tightening thread 61 observed along the first core cord 51 can be less than the pitch interval P2 of the fastener elements 4. This not only improves the attachment strength of the fastener elements 4 by using the first tightening thread 61 as described above, but also allows changes in the attachment strength of the fastener elements 4 to be considered more non-localized.

Specifically, by satisfying the above-mentioned condition P1 < P2, the frequency with which fastener elements 4 are attached at points where the tightening yarn intersects with the core cord is increased compared to when this condition is not met. In short, over a certain length along the warp direction (front-to-back direction), the number of fastener elements 4 (i.e., elements with a second attachment strength) attached to the core cord at points where the tightening yarn intersects with the core cord increases compared to the number of fastener elements 4 (i.e., elements with a first attachment strength) attached to the core cord at points where there is no tightening yarn, and the change in attachment strength of the fastener elements 4 can be considered more non-localized. Preferably, 0.3 < (P1/P2) < 0.6 is satisfied. Thus, the use of the first tightening yarn 61 improves the attachment strength of the fastener elements 4 while simultaneously promoting the delocalization (in other words, averaging) of the attachment strength of the fastener elements 4.

In addition, in the front-to-rear direction, the width (front-to-rear width) Q1 of the mounting base 41 (first leg portion 41p and second leg portion 41q) of the fastener element 4 is smaller than the width Q2 of the gap between adjacent fastener elements 4 in the arrangement of the fastener elements 4. Preferably, this satisfies 0.5 < (Q1/Q2) < 0.7.

A modified example will be described with reference to Figure 8. As shown in Figure 8, it is also possible to use only one core cord 53 as the core cord. In this case, the same effect as described above can be obtained. The core cord 53 is fixed to the tape base fabric 33 by a first tightening thread 61 and a second tightening thread 62 and is held between the first wale _W1 and the second wale _W2 .

As shown in Figure 9, the second tightening yarn 62 may be changed to a 1/2 tricot yarn, similar to the first tightening yarn 61. In the first wale _W1 , none of the tightening yarns form loops, and the same effect as described above is obtained. In the second wale _W2 , it is preferable that loops of the first tightening yarn 61 and loops of the second tightening yarn 62 are formed alternately along the warp direction, thereby suppressing thickness variations in the same direction.

In light of the above disclosure, those skilled in the art will be able to make various modifications to each feature and embodiment. Reference signs included in the claims are for reference purposes only and should not be used to limit the scope of the claims.

1: Slide fastener 2: Fastener stringer 3: Fastener tape 4: Fastener element 5: Core string

33: Tape base fabric 38: Side edge portion

51: First core string 52: Second core string 53: Core string

61: First binding thread 62: Second binding thread

71: Weft insertion yarn 72: Weft insertion yarn 73: Weft insertion yarn

611: Inverted portion 612: Loop 621: Inverted portion 711: Inverted portion

CP: Center _W1 : First wale _W2 : Second wale _W3 : Third wale

Claims (12)

a warp knitted tape base (33) having side edges (38) extending in the warp direction;
A fastener tape (3) comprising at least one core string (51, 52, 53) inserted as a warp thread into the side edge portion (38) of the tape base fabric (33),
The at least one core cord (51, 52, 53) is fixed to the side edge (38) of the tape base fabric (33) by at least one fastening thread (61, 62);
The side edge portion (38) includes a first wale (W 1 ) located on the outer side of the tape from the center (CP) of the at least one core string (51, 52, 53) and a second wale (W ₂ ) located on the inner side of the tape from the center (CP) of the at least one core string (51, 52, ₅₃ ),
The fastener tape includes a predetermined tightening yarn (61) in which the at least one tightening yarn (61, 62) turns over without forming a loop in the first wale (W ₁ ) and then forms a loop in which the ground yarn of the tape base fabric (33) is entangled in the second wale (W ₂ ). The at least one core cord (51, 52, 53) includes a first core cord (51) and a second core cord (52) that are knitted separately,
The at least one tightening thread (61, 62) includes a first tightening thread (61) for the first core string (51) and a second tightening thread (62) for the second core string (52),
The first tightening thread (61) is the predetermined tightening thread (61),
2. The fastener tape according to claim 1, wherein the second fastening yarn (62) is a weft insertion yarn that oscillates by repeatedly reversing without forming a loop in both the first wale (W ₁ ) and the other wales (W ₂ , W ₃ ). The fastener tape according to claim 2, wherein the other wale ( _W3 ) is a wale ( _W3 ) located more inwardly of the tape than the second wale ( _W2 ). The fastener tape according to claim 2, wherein the swing width of the second tightening thread (62) is wider than the swing width of the first tightening thread (61). The fastener tape according to claim 2, wherein in the first wale (W ₁ ), the inverted portions (611) of the first tightening threads (61) and the inverted portions (621) of the second tightening threads (62) are alternately formed in the warp direction. The fastener tape according to any one of claims 1 to 5, wherein no other loops are formed in the first wale ( _W1 ) except for loops formed by the ground yarns of the tape base fabric (33). The fastener tape according to any one of claims 1 to 5, wherein the first wale ( _W1 ) is a wale located most outwardly of the fastener tape (3). a sinker loop surface and a needle loop surface opposite thereto;
The fastener tape according to any one of claims 1 to 5, wherein the predetermined tightening thread (61) contacts the at least one core cord (51, 52, 53) on the sinker loop surface side and repeatedly crosses the at least one core cord (51, 52, 53) on the sinker loop surface side. The fastener tape according to any one of claims 1 to 5, wherein the tape base fabric (33) includes a plurality of chain stitches (W ₁ to W _n ) and a plurality of weft insertion yarns (71, 72, 73) that oscillate with an oscillation width across different wales so as to connect the plurality of chain stitches. The fastener tape according to claim 9, wherein in the first wale (W ₁ ), the inverted portion (611) of the predetermined fastening yarn (61) crosses the chain stitch yarn of the chain stitch and is held by the chain stitch yarn. A fastener tape according to any one of claims 1 to 5, wherein the pitch of the fastening threads (61, 62) observed along the at least one core string (51, 52, 53) is less than the pitch of the fastener elements (4) relative to the fastener tape (3). A fastener tape (3) according to any one of claims 1 to 5;
The fastener stringer comprises a plurality of metal fastener elements (4) attached to the at least one core cord (51, 52, 53) of the fastener tape (3).