Slide fastener chain and slide fastener

Abstract

The utility model provides a zipper chain and a zipper, which are favorable for reducing the sliding resistance of a puller and realizing the practical sliding strength of metal zipper teeth. In a fastener chain in which rows of a pair of metal elements (3) facing each other of a pair of stringers are in an engaged state, each stringer comprises: a fastener tape (1); and a row of metal elements (3) attached to a core portion (12) formed along the inner edge of the fastener tape (1) at a predetermined interval in the longitudinal direction of the fastener tape (1), the metal elements (3) comprising: a pair of leg portions (10); and a head part (9) connecting the pair of leg parts (10) and including a convex portion (9a) and a concave portion (9b) for meshing with each other, satisfying 0.7 < = PV / SA < = 0.92, and satisfying PS / PV < = 0.24.

Description

Technical Field

[0001] The utility model relates to a metal zipper, and more particularly to a zipper chain and a zipper having metal chain element rows. Background Art

[0002] There are cases where the chain element rows are made of metal in zippers, and such zippers are generally referred to as "metal zippers". Metal zippers are usually manufactured through an intermediate product called a zipper chain, which is formed by meshing metal chain element rows installed on the mutually facing side edges of each zipper tape of a pair of long strips. The zipper chain is cut into a specified length, a slider is arranged between the pair of facing chain element rows, and various components such as an upper stopper and a lower stopper are installed, thereby completing the metal zipper.

[0003] As a metal fastener element, there is known a fastener element including a pair of legs and a head portion connecting the pair of legs and having a convex portion and a concave portion for engaging with each other (Patent Document 1).

[0004] The zipper is opened and closed by sliding the slider along the chain teeth to engage or disengage the pair of chain teeth facing each other. When the slider slides, a certain amount of sliding resistance is generated due to friction with the pair of chain teeth facing each other. In order to smoothly open and close the zipper, it is necessary to reduce the sliding resistance.

[0005] In addition, in a metal zipper, the metal chain elements are attached to the side edge of the zipper tape by pressing and fixing a pair of legs to a core (rib) formed along the length direction. Therefore, a high chain element sliding strength is required so that the metal chain elements attached to the zipper tape are not easily displaced or fall off.

[0006] For example, Patent Document 2 states that: On the side edge of the zipper tape, the core rope is covered and fixed in a hollow woven structure. It is also stated that: The core rope is made thinner to increase the flexibility of the core rope, thereby increasing the flexibility of the zipper tape in the gap between the chain elements, thereby reducing the sliding resistance of the slider. It is further stated that: In the hollow woven structure, since the warp uses a softer spun yarn and the weft uses a harder filament yarn, the volume around the core rope increases, which can ensure the sliding strength of the metal chain elements.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Utility Model Registration No. 3198065

[0010] Patent Document 2: U.S. Patent No. 11253032 Utility Model Content

[0011] As proposed in Patent Document 2, if the core rope is thin, the side edge of the zipper tape to which the chain element row is attached is more flexible, thereby helping to reduce the sliding resistance of the slider. In addition, as proposed in Patent Document 2, the core rope is covered and fixed by a hollow braided structure using spun yarn and filament yarn, thereby increasing the volume near the core rope, which helps to improve the sliding strength of the chain element.

[0012] However, Patent Document 2 does not fully explain the specific relationship between the metal elements and the side edges of the fastener tape that can reduce the sliding resistance of the slider and improve the sliding strength of the metal elements.

[0013] In view of the above, one object of the present invention is to provide a zipper chain that can help reduce the sliding resistance of the slider and achieve practical sliding strength of the metal chain elements. In addition, another object of the present invention is to provide a zipper including the zipper chain as described above.

[0014] The inventors of the present invention have conducted in-depth research to solve the above-mentioned problem and found that it is effective to solve the problem if the area of ​​the internal space sandwiched between a pair of legs of a metal chain tooth, the cross-sectional area of ​​the core inserted into the internal space and the softness of the core satisfy a prescribed relationship, thereby completing the utility model illustrated below.

[0015] (Method 1)

[0016] A zipper chain, wherein a pair of metal fastener elements 3 of a pair of fastener tapes facing each other are in a meshing state, wherein:

[0017] Each fastener tape includes: a zipper tape 1; and a row of metal fastener elements 3, which are installed on a core portion 12 formed along the inner edge of the zipper tape 1 at predetermined intervals in the longitudinal direction of the zipper tape 1.

[0018] The metal fastener element 3 includes: a pair of legs 10; and a head 9, which connects the pair of legs 10 and includes a convex portion 9a and a concave portion 9b for engaging with each other.

[0019] The area (mm) of the internal space sandwiched between the pair of legs when the metal fastener element is viewed from a direction parallel to the longitudinal direction of the fastener tape 1 is 2 ) is set as SA,

[0020] In the portion of the zipper tape where the metal chain element is not installed, Figure 7The cross-sectional area (mm) of the core portion when viewed from a direction parallel to the longitudinal direction of the fastener tape in a state where the measuring jig 40 shown in the figure compresses the core portion 12 with a force of 49 N. 2 ) is set as PV,

[0021] Will use Figure 8 When the spring constant (N / mm) of the measuring device 80 shown in the figure when pressing the row of the metal elements 3 in the width direction of the fastener tape is PS, 0.7≤PV / SA≤0.92 is satisfied, and PS / PV≤0.24 is satisfied.

[0022] (Method 2)

[0023] In the slide fastener chain described in Embodiment 1, 0.83≤PV / SA≤0.89 is satisfied, and PS / PV≤0.14 is satisfied.

[0024] (Method 3)

[0025] In the slide fastener chain described in aspect 1 or aspect 2, the core portion 12 is formed of a core string 21 including two or more core wires 21a and a sheath wire 21b braided around the core wires 21a, and the core wires 21a are formed of at least two types of core wires 21a having different thicknesses.

[0026] (Method 4)

[0027] In the slide fastener chain described in Embodiment 3, the core thread 21a is formed of a thick thread and a thin thread, and the number of the thick thread is greater than the number of the thin thread.

[0028] (Method 5)

[0029] In the slide fastener chain according to Embodiment 4, the thickness of the thick wire is 330T to 500T, and the thickness of the thin wire is 167T to 330T.

[0030] (Method 6)

[0031] In the slide fastener chain according to any one of aspects 3 to 5, the cover cord 21b is a cord having a thickness equal to that of the core cord 21a or a cord thinner than the core cord 21a.

[0032] (Method 7)

[0033] In the fastener chain according to any one of aspects 1 to 6, the core portion 12 includes two core cords 21 integrally woven into the inner edge of the fastener tape 1 made of woven fabric in a bead-woven structure.

[0034] (Method 8)

[0035] A slide fastener comprising: the slide fastener chain according to any one of aspects 1 to 7; and a slider inserted between the rows of the metal elements 3 of the slide fastener chain.

[0036] Utility Model Effect

[0037] One embodiment of the utility model relates to a zipper chain, which can make the metal chain elements installed on the zipper tape have practical sliding strength and make the slider slide with low sliding resistance. Therefore, the zipper with the zipper chain can be opened and closed by the user with relatively light force, thereby improving the usability of the metal zipper. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic front view of a metal zipper.

[0039] Figure 2 It is a schematic three-dimensional diagram of a metal fastener element.

[0040] Figure 3 It is a schematic side view of a metal fastener element.

[0041] Figure 4 This is a schematic partial cross-sectional view of a metal fastener element attached to a side edge of a fastener tape when viewed from a direction parallel to the direction in which the fastener element row extends.

[0042] Figure 5 This is a diagram for explaining a method of attaching a metal element row to a core portion of a fastener tape.

[0043] Figure 6-1 It is a schematic diagram for explaining a first structural example of the core portion.

[0044] Figure 6-2 It is a schematic diagram for explaining a second structural example of the core portion.

[0045] Figure 6-3 It is a schematic diagram for explaining a third structural example of the core portion.

[0046] Figure 7 is a schematic diagram of a measuring jig for measuring the cross-sectional area PV of the core.

[0047] Figure 8 This is a schematic diagram of a measuring jig for measuring the spring constant PS.

[0048] Fig. 9 It is a schematic diagram for explaining the measurement method of the spring constant PS.

[0049] Description of Reference Numerals

[0050] 1 Zipper tape 1c first main surface

[0051] 1d Second main surface 3 Metal fastener element

[0052] 4 upper stop 5 lower stop

[0053] 6 pull heads 9 heads

[0054] 9a convex part 9b concave part

[0055] 10 Legs 11 Main Body

[0056] 12 core 13 main surface

[0057] 21 core rope 21a core wire

[0058] 21b leather thread 23a surface thread

[0059] 23b Looper Line 40 Measuring Fixture

[0060] 41 lower die 41a V-shaped receiving groove

[0061] 41b: upper mold of receiving portion 42

[0062] 42a Inverted V-shaped pressing groove 80 measuring device

[0063] 81 tooth chain belt 82 punch

[0064] 83 Clamp DETAILED DESCRIPTION

[0065] Metal zippers can be installed on various articles, and in particular, they function as opening and closing members. There are no particular restrictions on the articles on which zippers are installed, and for example, in addition to daily necessities such as clothing, bags, shoes, and groceries, there are also industrial products such as water tanks, fishing nets, and space suits.

[0066] Figure 1 The schematic front view of a metal zipper is shown as an example. Figure 1 As shown, the metal zipper is provided with rows of metal chain elements 3 installed at predetermined intervals along the length direction L of the zipper tape 1 on each inner side edge of a pair of zipper tapes 1. A structure in which a row of metal chain elements 3 is installed on the side edge of a zipper tape 1 is called a chain tape, and a structure in which the rows of metal chain elements 3 of a pair of chain tapes facing each other are in a meshing state is called a zipper chain. A structure including a zipper chain and a slider inserted between the rows of metal chain elements 3 of the zipper chain is called a zipper. A direction parallel to the main surface 13 of the zipper tape 1 and orthogonal to the length direction L of the zipper tape 1 is called the width direction W of the zipper tape 1. In addition, a direction perpendicular to the main surface 13 of the zipper tape 1 is called the thickness direction T of the zipper tape 1.

[0067] The zipper tape 1 includes a main body 11 and a core 12 formed along the inner edge of the main body 11. Each metal chain element 3 constituting a row of metal chain elements 3 is installed by being pressed and fixed to the core 12 formed on the inner edge of the zipper tape 1. In addition, the metal zipper can include: an upper stopper 4 and a lower stopper 5, which are pressed and fixed to the core 12 of the zipper tape 1 at the upper and lower ends of the row of metal chain elements 3; and a slider 6, which is used to engage and disengage a pair of metal chain elements 3, is inserted between a pair of opposing rows of metal chain elements 3, and slides freely in the up and down directions. The lower stopper 5 can be a separation insert including an insert rod, a seat rod, and a socket body, which can separate a pair of zipper chains by the separation operation of the slider. Other embodiments not shown in the figure are also possible.

[0068] Figure 2 A schematic perspective view of a metal fastener element 3 is shown. Figure 3 A schematic side view of a metal fastener element 3 is shown. Figure 4 A schematic partial cross-sectional view of a metal element 3 attached to a side edge of a zipper tape 1 is shown when viewed from a direction parallel to the direction in which the element row extends. Each metal element 3 includes: a pair of legs 10; and a head 9 that connects the pair of legs 10 and has a convex portion 9a and a concave portion 9b for engaging with each other.

[0069] When the metal fastener element 3 is viewed from a direction parallel to the direction in which the row of the metal fastener elements 3 extends (the longitudinal direction L of the fastener tape 1), the inner space ( Figure 4 The gray part in the figure) contains the core 12. Here, the boundary of the internal space is a straight line connecting the top ends of the pair of legs 10 (see Figure 4 The top end of each leg portion 10 refers to a portion of the leg portion 10 that is located farthest from the head portion 9 in the width direction W of the fastener tape 1.

[0070] The material of the metal link element 3 is not particularly limited, and copper (pure copper), copper alloys (such as copper alloys containing zinc (Cu-Zn alloys) such as red copper, brass, and nickel silver) or aluminum alloys (Al-Cu alloys, Al-Mn alloys, Al-Si alloys, Al-Mg alloys, Al-Mg-Si alloys, Al-Zn-Mg alloys, Al-Zn-Mg-Cu alloys, etc.), zinc, zinc alloys, iron, and iron alloys (stainless steel, etc.) can be used. For example, a profiled wire having a roughly Y-shaped cross section produced by heat treatment and cold rolling steps is cut into a specified size and stamped to form a convex portion 9a and a concave portion 9b for engagement on the head 9, thereby manufacturing the metal link element 3. The surface of the metal link element 3 may also be subjected to various surface treatments such as smoothing, rust prevention, painting, plating, chemical treatment, and gloss polishing. In order to reduce the sliding resistance, generally known chemical polishing may be performed. However, if the number of times of chemical polishing increases, the spring constant PS increases. Therefore, it is preferable that the number of times of chemical polishing does not exceed two times.

[0071] Figure 5 This is a diagram for explaining how to attach a row of metal elements 3 to a core 12 of a zipper tape 1. The metal elements 3 are attached to the side edge of the zipper tape 1 by pressing the two leg portions 10 against the core 12 formed along the length direction of the zipper tape. A fastener tape is produced by attaching a plurality of metal elements 3 to the side edge of the zipper tape 1 at predetermined intervals in the length direction of the zipper tape 1. Next, a zipper chain is produced by meshing the rows of metal elements 3 facing each other of a pair of fastener tapes.

[0072] As the fastener tape 1, a fiber tape such as a woven fabric tape, a knitted fabric tape, a nonwoven fabric tape, etc., which is used in conventional slide fasteners, can be used without particular limitation. As the material of the fiber, polyester, nylon, polypropylene, acrylic, etc., which are used in conventional slide fasteners, can be used without particular limitation.

[0073] The core portion 12 formed at the inner edge of the fastener tape 1 can be formed by weaving in at least one core string 21 extending in the longitudinal direction of the fastener tape 1 . Figure 6-1 and Figure 6-2 2 is a schematic perspective view of a structural example of a core portion 12 into which at least one core rope 21 is woven.

[0074] exist Figure 6-1 In the first structural example shown, the core portion 12 formed on the inner edge of the woven fabric zipper tape 1 includes a core cord 21 integrally woven in a bag-woven structure. The core cord 21 includes: two or more core wires 21a; and a leather wire 21b woven around the core wire 21a. In this case, the metal chain element 3 is pressed and fixed in a manner of clamping a core cord 21 arranged along the inner edge.

[0075] In Figure 6-2 In the second structural example shown, the core portion 12 formed at the inner edge of the zipper tape 1 made of woven fabric includes two core cords 21 integrally woven in a bead knitting structure (Japanese: ビーズ織り込み構造). In the second structural example, the two core cords 21 are arranged in parallel in the thickness direction of the zipper tape 1 along the inner edge. Each of the core cords 21 includes: two or more core wires 21a; and a skin wire 21b woven around the core wires 21a. In this case, the metal teeth 3 are pressed and fixed in such a manner as to sandwich the two core cords 21 arranged along the inner edge.

[0076] In addition, the core portion 12 can also be formed by sewing at least one core cord along the inner edge of the zipper tape 1. In Figure 6-3 In the third structural example shown, the core portion 12 formed at the inner edge of the zipper tape 1 made of plain weave or knitting includes two core cords 21 sewn to the front and back of the zipper tape 1 with sewing threads. Each of the core cords 21 includes: two or more core wires 21a; and a skin wire 21b woven around the core wires 21a. The sewing threads can include, for example: a face thread 23a that forms a first sewing line on the first main surface 1c side of the zipper tape 1; and a bent needle thread 23b that forms a second sewing line on the second main surface 1d side of the zipper tape 1. The sewing method is not particularly limited, and examples include chain stitch and lock stitch. In the case of chain stitch, since the usage amounts of the face thread and the bent needle thread are different, in order to ensure the correct installation state and strength of the teeth, upper stops, lower stops, etc., it is preferable to adjust the thicknesses of the two threads and the thickness of the core cord. Specifically, it is preferable that the face thread 23a is thicker than the bent needle thread 23b, and the core cord 21 sewn with the face thread 23a is thicker than the core cord 21 sewn with the bent needle thread 23b. In the case of lock stitch, it is preferable that the face thread 23a and the bent needle thread 23b have the same thickness, and the core cord 21 sewn with the face thread 23a and the core cord 21 sewn with the bent needle thread 23b have the same thickness.

[0077] In order to reduce the sliding resistance of the slider and achieve a practical sliding strength of the metal teeth, it is preferable that the following three parameters (a), (b), and (c) of the zipper chain satisfy specified conditions.

[0078] (a) The area SA (mm 2 )

[0079] of the internal space sandwiched between a pair of legs when observing the metal teeth in a direction parallel to the direction in which the metal tooth row extends (the length direction L of the zipper tape 1). Figure 7 (b) The cross-sectional area PV (mm 2)

[0080] (c) Use Figure 8 The spring constant PS (N / mm) when the measuring device 80 shown in the figure presses the row of metal elements 3 in the width direction W of the fastener tape 1 is

[0081] (a), (b), and (c) can be measured by the following method.

[0082] (a) After the zipper chain is separated into two tooth chain tapes, for one tooth chain tape, the zipper tape between adjacent chain elements is cut in a manner such that the cutting direction is parallel to the width direction W of the zipper tape. Then, the two cut surfaces obtained are observed from a direction parallel to the direction in which the metal chain element row extends (the length direction of the zipper tape 1), and the areas SA of the internal spaces of the two adjacent chain elements are measured. The area SA of the internal space is the area enclosed by the contour of the inner circumference of the pair of leg portions 10 and the boundary of the above-mentioned internal space (refer to Figure 4 ). In this way, the area SA (mm) of the internal space is measured for 5 fastener elements at random. 2 ), and set their average value as the measured value.

[0083] In addition, since a pair of fastener tapes constituting a slide fastener chain are usually of the same specification, the area SA of the internal space may be measured for one fastener tape. When a pair of fastener tapes have fastener tapes of different specifications, the area SA of the internal space is measured for each fastener tape.

[0084] (b) The cross-sectional area PV of the core 12 is used Figure 7 The measuring jig 40 shown in the figure is used for measurement. The measuring jig 40 comprises: a lower die 41, which has a V-shaped receiving groove 41a with an opening angle of 90° formed on the upper surface for receiving the core part 12 of the zipper tape (the length of the groove in the paper depth direction is 30 mm), and has a cutout with a length of 2 mm in the paper depth direction; and an upper die 42, which is arranged in a manner that can be lowered toward the cutout of the lower die 41, and has an inverted V-shaped pressing groove 42a with an opening angle of 90° formed on the lower surface for pressing the core part 12 received in the V-shaped receiving groove 41a (the length of the groove in the paper depth direction is 1 mm). In addition, in the lower die 41 of the measuring jig 40, there is an opening with a width G=1 mm in the left-right direction of the paper at the bottom of the V-shaped receiving groove 41a, and a receiving part 41b capable of receiving the main body 11 of the zipper tape 1 extends downward from the opening.

[0085] The measurement of the cross-sectional area PV of the core 12 by the measuring jig 40 is carried out as follows. The row of metal fastener elements 3 is removed from the fastener tape to form the fastener tape 1. Then, Figure 7As shown, after the core 12 is accommodated in the V-shaped receiving groove 41a of the lower mold 41 and the main body 11 is accommodated in the receiving portion 41b, the zipper tape 1 is pulled in the width direction and a force of 5kgf (49N) is applied along the length, thereby extending the zipper tape 1. In this state, the core 12 of the part where the row of metal chain elements 3 is not originally installed is pressed toward the cutout of the lower mold 41 by the upper mold 42 with a downward force of 5kgf (49N). The compression dimension (PM (Pressure Measurement) value) D between the intersection points P1 and P2 of the V-shaped receiving groove 41a and the inverted V-shaped pressing groove 42a at this time is measured and set to 1 / 2×D 2 = Cross-sectional area PV (mm 2 ).

[0086] In addition, the pair of fastener tapes that constitute the zipper chain are usually of the same specification, so the cross-sectional area PV can be measured for one fastener tape. When a pair of fastener tapes have different specifications, measure the cross-sectional area PV (mm) for each fastener tape. 2 ).

[0087] (c) The spring constant PS is used Figure 8 The measuring device 80 shown in the figure is implemented in the following steps. First, after the zipper chain is separated into two fastener tapes, the length direction L of the fastener tape of one fastener tape 81 becomes the horizontal direction, and the width direction W becomes the vertical direction, and the fastener tape 81 is fixed by the clamp 83 in such a way that the metal fastener elements 3 are located on the upper side. Next, the row of metal fastener elements 3 of the fastener tape 81 protruding from the clamp 83 is separated from the clamp 83 by a 5 mm interval in the horizontal direction, and the fastener tape 81 is fixed by the clamp 83. Fig. 9 The punch 82 with the top shape shown presses the row of metal elements 3 downward at a speed of 0.5 mm / second. The load (N) at this time is measured and a load-displacement curve is prepared. The slope (N / mm) of the curve when the metal element 3 is displaced downward by 0.5 mm to 1.2 mm is obtained and is set as the spring constant PS. The spring constant PS is an indicator of the flexibility of the core 12. It can be said that the smaller the spring constant, the higher the flexibility.

[0088] In addition, since a pair of fastener tapes constituting a slide fastener chain usually have the same specifications, the spring constant PS may be measured for one fastener tape. When a pair of fastener tapes have fastener tapes of different specifications, the spring constant PS is measured for each fastener tape.

[0089] In one embodiment, the zipper chain preferably satisfies 0.7≤PV / SA≤0.92, more preferably satisfies 0.8≤PV / SA≤0.9, and further preferably satisfies 0.83≤PV / SA≤0.89. There is a trend that the smaller the PV / SA, the smaller the sliding resistance of the slider and the smaller the sliding strength of the metal chain teeth. In addition, there is a trend that the larger the PV / SA, the larger the sliding resistance of the slider and the larger the sliding strength of the metal chain teeth. By satisfying the above-mentioned PV / SA conditions, the sliding resistance of the slider and the sliding strength of the metal chain teeth are properly balanced.

[0090] In addition to satisfying the above-mentioned PV / SA conditions, satisfying the following PS / PV conditions can improve the balance between the sliding resistance of the slider and the sliding strength of the metal chain teeth, so it is preferred. Although it is indicated that the smaller the PS, the higher the softness, the appropriate range changes due to the balance with the cross-sectional area PV, so PS / PV is used as an indicator. Specifically, it is preferred to satisfy PS / PV≤0.24, more preferably to satisfy PS / PV≤0.2, and further preferably to satisfy PS / PV≤0.14. There is a trend that the higher the softness of the core 12 on which the metal chain teeth 3 are installed, the smaller the PS / PV. The softness of the core 12 is affected not only by PV / SA, but also by the structure of the core 12. The lower limit of PS / PV is not specifically set, for example, 0.1≤PS / PV can be satisfied.

[0091] Preferred Figure 6-1 The first structural example of the core 12 shown in FIG. Figure 6-2 The second structural example of the core 12 shown in FIG. Figure 6-3 In any of the third structural examples of the core 12 shown in FIG. 1 , the core wire 21a is formed by at least two core wires 21a of different thicknesses. Moreover, it is more preferable that the number of thick wires is greater than the number of thin wires. Figure 6-2 and Figure 6-3 As shown, when the core 12 is formed by two core cords 21, typically six thick wires (500T) and one thin wire (330T) can be used for each core cord 21. This can reduce the cross-sectional area of ​​the core 12 and allow fine adjustments to be made to improve the sliding strength of the fastener elements.

[0092] In addition, it is preferred Figure 6-1 The first structural example of the core 12 shown in FIG. Figure 6-2 The second structural example of the core 12 shown in FIG. Figure 6-3In any of the third structural examples of the core 12 shown, the thickness of the core wire 21a is 330T to 500T (= Digitex). There is a tendency that the flexibility of the core 12 is improved when a thin wire is used. In addition, when a thick wire and a thin wire are used in combination, the thicker core wire 21a is preferably 330T to 500T (= Digitex), and the thinner core wire 21a is preferably 167T to 330T (= Digitex).

[0093] The leather cord 21b can be produced, for example, by weaving four knitting yarns around the core cord 21a from the warp direction to form a needle loop, and sequentially winding the needle loops around each other to weave an outer covering structure around the core cord 21a. Specifically, the leather cord 21b preferably has a thickness of 167T to 330T (= Digitex). There is a tendency that the use of a thinner wire will improve the flexibility of the core 12. In addition, the leather cord 21b is preferably a wire of the same thickness as the core cord 21a or a wire thinner than the core cord 21a.

[0094] When adjusting the thickness of the core 12 (i.e., the cross-sectional area PV of the core), the thickness of the sheath wire 21b is adjusted first. Then, in order to obtain the target cross-sectional area PV, the thickness and number of the core wires 21a are adjusted. In the case of a zipper of smaller size, for example, in Examples 1 and 2, four 167T wires are used as the sheath wire 21b. On this basis, in Example 1 described later, six 500T core wires 21a are used to obtain the target cross-sectional area PV. In Example 2 described later, in order to improve the sliding strength without excessively increasing the cross-sectional area PV, in addition to the six 500T core wires 21a, one 330T core wire 21a is added. In the case of a zipper of larger size, for example, in Examples 3 and 4 described later, four 330T wires are used as the sheath wire 21b. On this basis, in Example 3, six 330T core wires 21a are used to obtain the target cross-sectional area PV. In Example 4, in order to obtain the target cross-sectional area PV, seven 500T core wires 21a were used.

[0095] The core wire 21a and the sheath wire 21b may be formed of a monofilament wire or a multifilament wire obtained by bundling two or more monofilament wires. For example, a multifilament wire obtained by bundling 50 monofilament wires of 5T is one wire with a fineness of 250T.

[0096] As the material of the core thread 21 a and the cover thread 21 b , polyester, nylon, polypropylene, acrylic, etc., which are conventionally used in slide fasteners, can be used without particular limitation, and polyester is particularly preferred.

[0097] (Example)

[0098] The following describes embodiments of the present invention, which are provided for a better understanding of the present invention and its advantages, but not for limiting the present invention.

[0099] (1. Production of zipper chain)

[0100] Prepare a plurality of red copper metal chain teeth according to the test number. The metal chain teeth are Figures 2 to 4 The shape shown and the size shown in Table 1. Regarding the sizes in the table, 5RGM corresponds to the M-class chain width, 8MGM corresponds to the MH-class chain width, and 10MGM corresponds to the H-class chain width (JIS S3015:2019). Regarding the paint in the table, "C paint" means that the surface of the chain element is coated with a transparent paint with acrylic polyurethane resin as the main component for the purpose of improving corrosion resistance. In addition, a long strip of polyester zipper tape with a core at the side edge is prepared. The core is a braided structure of the core rope shown in Table 1. In addition, the core rope is formed by the core wire (thickness × number of roots) and the sheath wire (thickness × number of roots) recorded in Table 1. Both the core wire and the sheath wire are monofilament wires made of polyester.

[0101] The metal element rows were press-fastened to the side edges of the fastener tapes to produce fastener tapes, and the metal element rows of a pair of fastener tapes that face each other were meshed to produce fastener chains corresponding to the test numbers.

[0102] (2. Zipper chain structure)

[0103] The following parameters (a) to (c) were measured for the fastener chains of each test number by the above method. In addition, since the pair of fastener tapes constituting the fastener chain had the same specifications, one fastener tape or fastener tape was the measurement object. Table 1 shows the results.

[0104] (a) Area SA of the internal space sandwiched between a pair of legs of a metal fastener element (mm) 2 )

[0105] (b) Cross-sectional area PV of the core before the metal fastener element is attached to the fastener tape (mm 2 )

[0106] (c) Spring constant PS (N / mm) for metal chain element

[0107] (3. Characteristics of zipper chains)

[0108] (3-1: Sliding resistance)

[0109] The sliding resistance test was conducted according to JIS 3015:2007, and the sliding resistance value was calculated by the following method. A slider matching the size of the zipper chain was inserted into the zipper chain involved in each test number to construct a zipper. Next, the pull tab of the slider of the obtained zipper was pulled down along the length direction of the zipper tape to open the zipper. Then, the zipper was fixed to the clamp of the tensile testing machine, the pull tab was pulled at a constant speed of 1000mm / min, and the stroke was set to 120mm, and the average sliding resistance (N) in the closing direction of the zipper was measured (ignoring the sliding resistance values ​​from 0mm to 5mm and removing the average value of the values ​​after the maximum and minimum values). Table 1 shows the results.

[0110] The sliding resistance was evaluated based on the following criteria.

[0111] Excellent: less than 2.5N

[0112] Good: 2.5N or more but less than 3.0N

[0113] Unqualified: 3.0N or above

[0114] (3-2: Chain tooth sliding strength)

[0115] The zipper chain involved in each test number was separated into two fastener tapes, and when one fastener element in one fastener tape was pulled along the length direction L of the zipper tape, the tensile force (N) when the fastener element started to slide along the length direction L of the zipper tape was measured for 10 fastener elements according to ASTM D2061, and the average value was set as the fastener element sliding strength. Table 1 shows the results.

[0116] The sliding resistance was evaluated based on the following criteria.

[0117] Excellent: 80N or above

[0118] Good: 45N or more but less than 80N

[0119] Unqualified: less than 45N (Table 1)

[0120]

[0121] (3-3: Inspection)

[0122] In the slide fasteners of Examples 1 to 4, PV / SA is within the range of 0.70 to 0.92, and PS / PV is 0.24 or less, so that both practical element sliding strength and low sliding resistance of the slider can be achieved.

[0123] If Example 1 and Example 2 are compared, both of which have the same size of metal chain elements, the core rope in Example 2 is formed by two core wires of different thicknesses, and the number of thick wires is greater than the number of thin wires, so that the sliding resistance is the same and the sliding strength of the chain elements is further improved.

[0124] In Example 3, by adjusting the number and thickness of each of the core wire and the cover wire, it is possible to achieve both practical element sliding strength and significantly low sliding resistance of the slider.

[0125] The slide fasteners of Comparative Examples 1 to 7 could not simultaneously achieve both practical sliding strength and low sliding resistance of the slider because at least one of PV / SA and PS / PV was inappropriate.

Claims

1. A zipper chain, wherein a pair of metal chain elements (3) of a pair of chain tapes facing each other are in a meshing state, wherein: Each chain belt includes: A zipper tape (1); and a row of metal chain elements (3) which are mounted on a core (12) formed along the inner edge of the zipper tape (1) at predetermined intervals in the longitudinal direction of the zipper tape (1). The metal fastener (3) comprises: a pair of legs (10); and a head (9) connecting the pair of legs (10) and comprising a convex portion (9a) and a concave portion (9b) for engaging with each other. The area of ​​the internal space sandwiched between the pair of legs when the metal fastener element is viewed from a direction parallel to the length direction of the fastener tape (1) is defined as SA, and the unit of SA is mm. 2 , The cross-sectional area of ​​the core portion when the core portion (12) is observed from a direction parallel to the length direction of the zipper tape when the core portion (12) is compressed with a force of 49 N at a portion of the zipper tape where the metal fastener element is not installed is denoted as PV, where the unit of PV is mm. 2 , When the spring constant when the row of the metal fastener elements (3) is pressed along the width direction of the fastener tape is defined as PS, 0.7≤PV / SA≤0.92 and PS / PV≤0.24 are satisfied, wherein the unit of PS is N / mm.

2. The zipper chain according to claim 1, characterized in that: 0.83≤PV / SA≤0.89 and PS / PV≤0.14 are satisfied.

3. The zipper chain according to claim 1, characterized in that: The core part (12) is formed by a core rope (21) including two or more core wires (21a) and a sheath wire (21b) braided around the core wire (21a), and the core wire (21a) is formed by at least two core wires (21a) of different thicknesses.

4. The zipper chain according to claim 3, characterized in that: The core wire (21a) is formed by thick wire and thin wire, and the number of thick wire is greater than the number of thin wire.

5. The zipper chain according to claim 4, characterized in that: The thickness of the thick wire is 330T to 500T, and the thickness of the thin wire is 167T to 330T.

6. The zipper chain according to claim 3, characterized in that: The sheath wire (21b) is a wire having a thickness equal to that of the core wire (21a) or a wire thinner than the core wire (21a).

7. The zipper chain according to claim 1, characterized in that: The core part (12) has two core cords (21) which are integrally woven into the inner side edge of the fastener tape (1) made of woven fabric in a bead-woven structure.

8. The zipper chain according to claim 1, characterized in that: The compression of the core (12) with a force of 49 N is performed using a measuring fixture (40), The measuring fixture (40) comprises: a lower die (41) having a V-shaped receiving groove (41a) on its upper surface for receiving the core (12) and having a cutout; and an upper die (42) arranged to be able to descend toward the cutout of the lower die (41) and having an inverted V-shaped pressing groove (42a) on its lower surface for pressing the core (12) received in the V-shaped receiving groove (41a).

9. The zipper chain according to claim 1, characterized in that: The row of the metal fastener elements (3) is pressed along the width direction of the fastener tape using a measuring device (80).

10. A zipper, characterized in that: include: The slide fastener chain according to any one of claims 1 to 9; and a slider inserted between the rows of metal chain elements (3) of the slide fastener chain.

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