Zipper tape and zipper stringer
The warp-knitted tape base fabric with core cords and tightening threads addresses the issue of reduced attachment strength in fastener tapes by stabilizing the core cords, ensuring secure engagement and reducing fraying, thus enhancing durability.
Patent Information
- Application Number
- JP2022140103
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-09-02
- Publication Date
- 2025-09-22
- Estimated Expiration
- 2042-09-02
AI Technical Summary
Existing fastener tapes using tricot yarns risk reduced attachment strength due to wales overhanging the core cord, potentially compromising the attachment of fastener elements.
A warp-knitted tape base fabric with core cords fixed by tightening threads, where the tightening threads form loops in specific wales to prevent overhang and enhance attachment strength, using a combination of 1/2 tricot yarns and weft-insertion yarns to stabilize the core cords.
The solution prevents a decrease in attachment strength of fastener elements by stabilizing the core cords, ensuring secure engagement and reducing fraying, thereby enhancing the overall durability of the fastener tape.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present disclosure relates to fastener tapes and fastener stringers. [Background technology]
[0002] 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 the tricot yarn (see page 4, lines 4-10 and Figures 2-4 of the document).
[0003] Patent Document 2 discloses that the core is fixed by ground weft yarns and fastening weft yarns (see FIGS. 1 and 2 of the document). [Prior art documents] [Patent documents]
[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 55-148409 [Patent Document 2] Special Publication No. 54-21781 Summary of the Invention [Problem to be solved by the invention]
[0005] 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 structure is pulled strongly by the loops of the tricot yarn in the wales located on the outer side of the tape than the core cord, and there is a risk that the wales may partially (albeit slightly) overhang the tape outer side beyond the core cord. If such overhang is formed, there is a risk that the attachment strength of the fastener element to the core cord of the fastener tape may be reduced.
[0006] The inventors of the present invention have newly discovered a problem that can arise when tricot yarn is used as a tightening yarn in this manner. [Means for solving the problem]
[0007] A fastener tape according to one embodiment 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.
[0008] 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 width of the second tightening yarn is wider than the oscillation width 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.
[0009] 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 most outward on the fastener tape; and / or The fastener tape has a sinker loop surface and a needle loop surface on the opposite side thereof, and the specified tightening 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.
[0010] 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.
[0011] The pitch of the fastening yarn observed along the at least one core cord may be less than the pitch of the fastening elements relative to the fastener tape.
[0012] Any combination of the primary and secondary features described above is within the scope of the disclosure of this specification. [Effects of the Invention]
[0013] 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. [Brief explanation of the drawings]
[0014] [Figure 1] 1 is a front schematic view of a slide fastener according to one embodiment of the present disclosure. [Figure 2] 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. [Figure 3] 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. [Figure 4] This is a schematic diagram showing the 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. [Figure 5]This is a schematic weave diagram showing a state in which a first core cord is fixed between a first tightening yarn (1 / 2 tricot yarn) and a tape base fabric (for example, its weft-insertion yarn) (note that the second tightening yarn is not shown). [Figure 6] 1 is a schematic weave diagram showing a state in which a second core cord is fixed between a second tightening yarn (weft-insertion yarn) and a tape base fabric (for example, the weft-insertion yarn) (note that the first tightening yarn is not shown). [Figure 7] FIG. 3 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 binding thread is omitted from the illustration). [Figure 8] FIG. 10 is a schematic diagram showing that one core cord is fixed to a tape base fabric by first and second tightening threads. [Figure 9] FIG. 10 is a schematic diagram showing a modified example in which the second binding thread is a 1 / 2 tricot thread in addition to the first binding thread. DETAILED DESCRIPTION OF THE INVENTION
[0015] 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 the need for 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 are simplified for ease of illustration. Each feature is not limited to the fastener tape disclosed in this specification, but is understood as a universal feature applicable to various other fastener tapes not disclosed in this specification.
[0016] In this specification, the following directional terms may be used in the description: front-rear direction, left-right direction, and up-down direction. The front-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 the fastener tape 3). The left-right direction is a direction perpendicular to the front-rear direction and corresponds to the width direction of the slide fastener 1 (or the fastener stringer 2 or the fastener tape 3). The up-down direction is a direction perpendicular to the front-rear and left-right directions and corresponds to the thickness direction of the fastener tape 3. Of course, the up-down direction does not necessarily correspond to the vertical direction (direction of gravity). In other words, the directional terms referred to in this specification are understood based on the slide fastener 1 and are unrelated to the vertical direction (direction of gravity).
[0017] The configuration of the slide fastener 1 will be described with reference to Figures 1 to 3. Figure 1 shows the slide fastener 1, with left and right fastener stringers 2 engaged at their rear portions and disengaged at their front portions. Figure 2 shows the schematic configuration of the side edge portion of the fastener tape 3 in the thickness direction of one of the fastener stringers 2, and the schematic configuration of the fastener elements 4 attached to that side edge portion. Figure 3 shows the state in which the left and right fastener elements 4 are engaged with each other, particularly showing the state in which the first core cord 51 is fastened to the tape base fabric 33 by the first tightening thread 61.
[0018] The slide fastener 1 is a flexible, elongated member that extends longitudinally in the front-to-rear direction with a substantially constant left-to-right width (the same applies to the fastener stringer 2 and fastener tape 3). The slide fastener 1 has 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 has 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 the side edges 38 to which the fastener elements 4 are attached. The at least one core cord is inserted between adjacent wales at the side edges 38 of the tape base fabric 33, as described below. By providing the core cord in 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.
[0019] 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 with each other (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 either 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, or the type of rear stop. The slider 9 is typically made of metal or resin, but is not limited to these materials.
[0020] The tape base fabric 33 has a first tape surface 31 and a second tape surface 32 opposite to the first tape surface 31, and has a thickness defined thereby (see, for example, FIG. 2). The tape base fabric 33 is made of a knitted fabric and therefore has higher stretchability in the warp direction (front-to-back direction) compared to a woven fabric. Advantageously, the first tape surface 31 includes a sinker loop surface over its entirety or a part thereof (for example, an area limited to the side edge portions 38), and the second tape surface 32 includes a needle loop surface over its entirety or a part thereof (for example, an area limited to the side edge portions 38). In this case, a single Russell knitting machine or a crochet knitting machine can be used as a warp knitting machine, which increases the productivity of the fastener tape 3.
[0021] The tape base fabric 33 can include various knitting structures. In some cases, the tape base fabric 33 includes a plurality of chain stitches that individually form wales, and a plurality of weft insertion yarns that oscillate with an amplitude that spans between different wales so as to connect the plurality of 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 may include N wales W1 to W2. n Typically, N and n are natural numbers equal to or greater than 5. The number of weft-inserted yarns inserted into the tape base fabric 33 can also be adjusted arbitrarily. The swing widths of the individual weft-inserted yarns can be set to be equal, but this is not necessarily the case.
[0022] 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 fixed to the side edge 38 of the tape base fabric 33 by at least one tightening thread. Two separately knitted core cords (for example, the first core cord 51 and the second core cord 52 shown in Figure 2) may be inserted, and these core cords are fixed 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 (for example, the first tightening thread 61 and the second tightening thread 62 shown in Figure 2). The two core cords are layered directly in the thickness direction of the fastener tape 3, or layered 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.
[0023] Explaining more specifically with reference to FIG. 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. 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 the tape base fabric 33 is woven, and are fixed to the tape base fabric 33 by the first tightening thread 61 and the second tightening thread 62.
[0024] The first wale W1 is located on the outer side of 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 on the outermost side of the tape in the course direction (i.e., the end in the course direction). The second wale W2 is located on the inner side of 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 adjacent to the wale located on the outermost side of the tape in the course direction. Note that the outer side of the tape refers to the 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 surface. The inner side of the tape is the direction facing opposite to the outer side of the tape.
[0025] If there is a ground yarn of the tape base fabric 33 (e.g., the weft-insertion yarn described above) 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. If there is no ground yarn of the tape base fabric 33 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 from 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.
[0026] The fastener element 4 may be a metal or resin element attached to a core cord provided on the side edge 38 of the tape base fabric 33 (see FIG. 2). The fastener element 4 may have an attachment base 41 fixed to the core cord 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, a neck portion, and an engagement head portion in this order outside the tape, and is fixed to the side edge 38 of the tape base fabric 33 and the core cord at the attachment base.
[0027] 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 engaging portion 42 toward the inside of the tape, crossing the first core cord 51 and the second core cord 52, and have locking protrusions 41r and 41s at their tip portions. 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.
[0028] The engaging portion 42 has an engaging recess 42m and an engaging protrusion 42n, which are arranged at a position away from the side edge 38 of the tape base fabric 33 toward the outside of the tape and 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 with each other, the engaging protrusion 42n of the fastener element 4 on one side enters and engages with the engaging 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 are engaged and closed. Note that a configuration in which engaging protrusions are formed on both the front and rear surfaces of the engaging portion 42 is also within the scope of expectation.
[0029] The first leg portion 41p, the second leg portion 41q, and the engaging portion 42 form a holding portion 41k of the fastener element 4, which holds a core cord (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 holding 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 an 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 projection 41r and the inner wall surface 42e. Similarly, the second core cord 52 is positioned and compressed between the locking projection 41s and the inner wall surface 42e. Note that although Fig. 2 shows a gap between the retaining portion 41k and the side edge portion 38 of the tape base fabric 33, in reality the fastener element 4 is attached so that there is no or almost no gap.
[0030] As shown in Fig. 3, the first wale W1 of the tape base fabric 33 may protrude further outward from the tape 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 farther outward from the tape. 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 contact between the inner wall surface 42e of the engaging portion 42 and the first wale W1 may reduce the attachment strength of the fastener element 4 to the fastener tape 3.
[0031] 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 width and also at the other end. 1 / 2 tricot yarns form a loop at one end of their swing width and do not form a loop at the other end. Therefore, the term "1 / 2" is added before "tricot" to distinguish between the two.
[0032] As shown in Figures 4 and 5, the first tightening thread 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 (for example, the chain stitch yarn shown in the figure) is not strongly pulled by the first tightening thread 61. As a result, a recess is locally formed in the first wale W1 that is recessed inward of the tape, and this reaction is prevented from causing a local protrusion that protrudes outward of 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 thread 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 (for example, the chain stitch yarn shown in the figure), and therefore can function as a tightening thread.
[0033] 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 an inverted portion 611 in the first wale W1 and a loop 612 in the second wale W2. The inverted portion 611 does not include a loop in which the ground yarn of the tape base fabric 33 is entangled, and intersects with the chain stitch yarn of the first wale W1 at two points and is held in place by these. 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).
[0034] 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 tightening yarn 62 be a weft insertion yarn that oscillates by repeatedly turning over without forming loops in both the first wale W1 and other wales. In the case shown in Figures 4 and 6, the second tightening yarn 62 is a weft insertion yarn that oscillates by repeatedly turning over without forming loops in the first wale W1 and in the third wale W3. More specifically, in the first wale W1, each turning over portion 621 of the second tightening 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 turning over portion 621 of the second tightening 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 tightening yarn 62 crosses the chain stitch yarn of the second wale W2 and is held thereby.
[0035] 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, by forming the reversal portions 611 of the first tightening thread 61 and the reversal portions 621 of the second tightening thread 62 alternately in the warp direction in the first wale W1, it is possible to suppress changes in the thickness of the first wale W1 along the warp direction. Furthermore, by not providing a course where only the ground yarn (chain stitch yarn) exists, the fastener element 4 is attached to the fastener tape 3 stably.
[0036] 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 the impact on human vision is relatively small due to the inherent unevenness of the needle loop surface. Furthermore, since the first tightening thread 61 is a 1 / 2 tricot thread that forms loops only in the second wale W2, it does not have as high a tension as a normal tricot thread, and the core thread does not stand out more than the inherent unevenness of the needle loop surface.
[0037] When the knitted fabric of the tape base fabric 33 includes weft insertion yarns (for example, weft insertion yarns 71-73 in Figure 5) in addition to a chain stitch structure, the inverted portion 711 of the weft insertion yarn 71 and the inverted portion 611 of the first tightening yarn 61 may be positioned in the same course in the first wale W1 (see Figure 5). Alternatively, the inverted portion 711 of the weft insertion yarn 71 and the inverted portion 621 of the second tightening yarn 62 may be positioned in the same course in the first wale W1. The weft insertion yarns 71 and 72 are yarns that pass between the first core cord 51 and the second core cord 52.
[0038] 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 string 51. Referring to FIG. 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 string 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 string 51 toward the inside of the tape. The first tightening yarn 61 repeats this process, and the first core string 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, double loops are 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.
[0039] The second tightening yarn 62 forms an inverted portion 621 in the third wale W3, which is immediately adjacent to and inside 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 the yarns are entangled can be determined based on whether one yarn reverses its traveling direction in relation to the other yarn.
[0040] Finally, returning to FIG. 3 for explanation. The pitch interval P1 of the first fastening thread 61 observed along the first core string 51 can be less than the pitch interval P2 of the fastener element 4. Thereby, in addition to the improvement in the mounting strength of the fastener element 4 by the adoption of the first fastening thread 61 described above, the change in the mounting strength of the fastener element 4 can be regarded as more non-local.
[0041] Specifically, by satisfying the above condition P1 < P2, the frequency at which the fastener element 4 is attached to the core string at the location where the fastening thread intersects the core string is increased as compared to the case where it does not. In short, in a certain length along the warp direction (front-back direction), compared to the number of fastener elements 4 (i.e., elements of the first mounting strength) attached to the core string at a location where there is no fastening thread, the number of fastener elements 4 (i.e., elements of the second mounting strength) attached to the core string at the location where the fastening thread intersects the core string increases, and the change in the mounting strength of the fastener element 4 can be regarded as more non-local. Preferably, 0.3 < (P1 / P2) < 0.6 is satisfied. Thus, while improving the mounting strength of the fastener element 4 by the adoption of the first fastening thread 61, the non-localization (in other words, averaging) of the mounting strength of the fastener element 4 is promoted.
[0042] In addition, in the front-back direction, the width Q1 (width in the front-back direction) 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 interval between adjacent fastener elements 4 in the arrangement of the fastener element 4. Preferably, 0.5 < (Q1 / Q2) < 0.7 is satisfied.
[0043] A modified example will be described with reference to FIG. 8. As shown in FIG. 8, it is also possible to adopt only one core string 53 as the core string. In this case, the same effect as described above can be obtained. The core string 53 is fixed to the tape base fabric 33 by the first fastening thread 61 and the second fastening thread 62 and is held between the first wall W1 and the second wall W2.
[0044] 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.
[0045] In light of the above disclosure, those skilled in the art can make various modifications to each feature and each embodiment. The reference numerals included in the claims are for reference purposes only and should not be used to limit the interpretation of the claims. [Explanation of symbols]
[0046] 1: Slide fastener 2: Zipper stringer 3: Zipper tape 4: Fastener element 5: Core string 33: Tape base fabric 38: Side edge 51: First core cord 52: Second core string 53: Core string 61: First binding thread 62: Second binding thread 71: Weft insertion thread 72: Weft insertion thread 73: Weft insertion thread 611: Inverted part 612: Loop 621: Inverted part 711: Reversal section CP: Center W1: First wale W2: Second wale W3: Third Wale
Claims
1. 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) is a first wale (W) located on the outer side of the tape than the center (CP) of the at least one core cord (51, 52, 53). 1 ) and a second wale (W) located inward of the tape from the center (CP) of the at least one core cord (51, 52, 53). 2 ), The at least one tightening thread (61, 62) is 1 ) is inverted without forming a loop, and the second wale (W 2 The fastener tape includes a predetermined fastening thread (61) that repeatedly forms a loop in which the ground thread of the tape base fabric (33) is entangled.
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), The second tightening thread (62) is 1 ) and another Wale (W 2 , W 3 2. The fastener tape according to claim 1, wherein the weft insertion yarns oscillate by repeatedly reversing without forming loops in both directions.
3. The other wale (W 3 ) is the second wale (W 2 ) located inside the tape 3 3. The fastener tape according to claim 2, wherein
4. 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).
5. The first wale (W 1 3. The fastener tape according to claim 2, wherein the reversed portions (611) of the first fastening threads (61) and the reversed portions (621) of the second fastening threads (62) are alternately formed in the warp direction.
6. The first wale (W 1 6. The fastener tape according to claim 1, wherein no other loops are formed except for loops formed by the ground yarns of said tape base fabric (33).
7. The first wale (W 1 6. The fastener tape according to claim 1, wherein the wale is located most outwardly of the fastener tape.
8. 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.
9. The tape base fabric (33) is made of a plurality of chain stitches (W 1 ~W n 6. The fastener tape according to claim 1, further comprising: a plurality of weft insertion yarns (71, 72, 73) oscillating with an oscillation width across different wales so as to connect the plurality of chain stitches.
10. The first wale (W 1 10. The fastener tape according to claim 9, wherein the reverse 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.
11. The 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 cord (51, 52, 53) is less than the pitch of the fastener elements (4) relative to the fastener tape (3).
12. 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).
Citation Information
Patent Citations
JP1974088644A
JP1975066806U
Slide fastener
JP1978017451A
Acoustic device with watch
JP1979021781A
- Slide fastener
JP1980148409U