Conductive thread and article having wiring made of conductive thread

Abstract

[Problem] To provide a conductive yarn which has conductivity that exhibits durability in terms of deformation and tensile force, while being free from the occurrence of twisting or slacking during sewing. The present invention is capable of providing an article that is provided with a flexible wiring line having a free shape by means of an easy method of sewing. [Solution] A conductive yarn which is characterized by comprising a non-twisted high-strength filament yarn, a first conductive filament yarn that covers the high-strength filament yarn with a Z twist, and a second conductive filament yarn that covers the high-strength filament yarn with an S twist. In addition, an article which has a wiring line that is formed of this conductive yarn.

Description

[Technical Field]

[0001] The present invention relates to an article having conductive threads and wiring formed using the conductive threads. [Background technology]

[0002] In recent years, many wearable devices have been proposed that incorporate various electronic devices into clothing. Electronic devices with various functions are mounted on clothing, including sensors for measuring body temperature and heart rate, electrodes used in low-frequency electrical stimulation therapy and EMS (Electrical Muscle Stimulation), and decorative LEDs. At the same time, the clothing also includes wiring for connecting to the power source to drive these electronic devices and for inputting and outputting signals.

[0003] The wiring in wearable devices is typically made by cutting metal foil into the desired shape and attaching it to the device, or by printing it with conductive paste. However, these methods require the device to be protected with a resin coating to prevent breakage due to deformation of the garment. Such resin coatings pose a major problem: they impair the flexibility of the garment.

[0004] To avoid these problems, a method has been proposed in which metal wires or conductive fibers are incorporated into the weave of the fabric that forms the base material of clothing during weaving or knitting to form wiring, but this method has the problem of limited freedom in the wiring shape. Patent Document 1, therefore, discloses a sewing thread made by plying and twisting a conductive long fiber with a flame-retardant fiber having a limiting oxygen index (LOI) of 26 or more. It claims that the use of a flame-retardant fiber having a limiting oxygen index (LOI) of 26 or more makes it possible to withstand the abrasion and wear of a sewing needle, and that conductive patterns can be freely formed on the fabric by sewing with a sewing machine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-154944 Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 exemplifies a sewing thread made by plying a twisted spun yarn of a flame-retardant fiber with a conductive long fiber, and claims that this can prevent thread breakage during machine sewing. The flame-retardant spun yarn has high strength and moderate elongation when pulled in the longitudinal direction. This has the effect of reducing tension during machine sewing, but the conductive long fiber is not easily stretched, so there is a concern that it may break.

[0007] Furthermore, sewing threads made by twisting two types of fibers with different physical properties, namely flame-retardant spun yarn and conductive continuous fiber, have an imbalance in the stress caused by the twist. This makes the sewing thread prone to twisting and sagging at the seams during sewing. Twisting and sagging at the seams can cause a decrease in conductivity. This can also cause problems such as electrical shorts with adjacent wiring. [Means for solving the problem]

[0008] To solve the above problems, the inventors investigated the construction of a double-covered yarn having a high-strength filament yarn as the core yarn and two conductive filament yarns as the sheath yarn. As a result, they found that a conductive yarn in which one conductive filament yarn is Z-twisted and the other is S-twisted around an untwisted high-strength filament yarn is covered, resulting in excellent sewability and durable conductivity.

[0009] That is, the present invention uses high-strength fibers having a tensile strength of 20 cN / dtex or more. Multifilament yarn with a total fineness of 200dtex to 900dtex and a tensile strength of 1,500cN or more A first conductive material having a Z-twist covering a non-twisted high-strength filament yarn and the high-strength filament yarn. Metal-plated synthetic fiber A filament yarn and a second conductive material covering the high-strength filament yarn in an S-twist. Metal-plated synthetic fiber a conductive yarn having a filament yarn; Sewing thread for wiring formation comprising is.

[0010] This allows for wiring that is free from twists and slack in the conductive yarn when it is formed by sewing. Because a high-strength filament yarn is used as the core yarn, breakage of the first conductive filament yarn and the second conductive filament yarn, which are the sheath yarns, can be suppressed.

[0011] the first conductive material covering the high-strength filament yarn; Metal-plated synthetic fiber The number of twists (Tz) of the Z twist of the filament yarn and the second conductivity Metal-plated synthetic fiber The ratio of the number of twists (Ts) of the S twist of the filament yarn is preferably Tz:Ts=1:0.8 to 1.2. More preferably, Tz and Ts are the same. This makes it possible to more effectively prevent twisting and sagging of the conductive yarn during wiring formation.

[0012] The high-strength fibers forming the high-strength filament yarns preferably have a tensile strength of 20 cN / dtex or more. The high-strength fibers are preferably ultra-high molecular weight polyethylene fibers. This prevents breakage of the first conductive filament yarns and the second conductive filament yarns, and maintains high conductivity, even when tension is applied to the wiring portion when the garment is worn after sewing.

[0013] The first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber Both the filament yarn and the copper plating Coated polyester filament yarn or silver plating Coated polyester filament yarn is preferable, as it allows for the formation of low-resistance wiring, which has the effect of reducing power consumption and improving the accuracy of input and output signals.

[0014] The present invention relates to the conductive yarn. Sewing thread for wiring formation comprising This makes it possible to manufacture an article having wiring that is flexible and highly durable against pulling, using a simple method such as sewing. [Effects of the Invention]

[0015] According to the present invention, it is possible to obtain a conductive thread that has excellent sewability and conductivity that is highly durable against pulling in the longitudinal direction. By using the conductive thread of the present invention, flexible wiring with a high degree of freedom in shape can be formed by the simple method of sewing. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an enlarged photograph showing an example of a conductive thread of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The conductive yarn of the present invention has a tensile strength 20cN / dtex The conductive yarn of the present invention has a double-covered structure, which includes a high-strength filament yarn using the high-strength fiber described above and is covered with a first conductive filament yarn and a second conductive filament yarn. The high-strength filament yarn is an untwisted yarn and serves as the core yarn in the conductive yarn of the present invention, which has a double-covered structure consisting of a core yarn and a sheath yarn.

[0018] The high strength filament yarn of the present invention has a tensile strength 20cN / dtex The tensile strength in the present invention is the tensile strength in the longitudinal direction of the filament measured in accordance with JIS L 1013, and the tensile strength of the high-strength fiber forming the high-strength filament yarn of the present invention is 20 cN / dtex or more, more preferably 20 cN / dtex to 50 cN / dtex, and particularly preferably in the range of 30 cN / dtex to 40 cN / dtex. The tensile strength of the high-strength fiber 20cN / dtex If the value is equal to or greater than this, it is possible to prevent a decrease in conductivity during sewing or wearing. The single yarn fineness of the high strength fiber is preferably about 0.5 to 10 dtex.

[0019] Tensile strength in the longitudinal direction 20cN / dtexExamples of high-strength filament yarns made from the above high-strength fibers include para-aramid fiber filament yarns, ultra-high molecular weight polyethylene filament yarns, liquid crystal polyester filament yarns, and polyarylate filament yarns. Among these, ultra-high molecular weight polyethylene filament yarns made from ultra-high molecular weight polyethylene fibers are preferred because of their high abrasion resistance and light weight. The ultra-high molecular weight polyethylene fibers are preferably made from ultra-high molecular weight polyethylene with an average molecular weight of about 1,000,000 to 7,000,000.

[0020] The high-strength filament yarn is preferably a multifilament yarn, and its total fineness is preferably 50 dtex to 2,000 dtex, more preferably 200 dtex to 900 dtex. The tensile strength of the high-strength filament yarn is preferably 1,500 cN or more.

[0021] It is essential that the high-strength filament yarn is an untwisted yarn. By using an untwisted high-strength filament yarn, the conductive yarn of the present invention has the effect of not causing twists or slack when forming wiring by sewing. The number of filaments in the multifilament yarn is not particularly limited, but is preferably 10 to 1,000, and more preferably 10 to 300.

[0022] The first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber The filament yarn serves as the sheath yarn in the conductive yarn of the present invention, which has a double-covered yarn structure. The covered yarn structure consists of a core yarn and a sheath yarn wound around the core yarn, and the double-covered yarn has a two-layer structure consisting of a lower sheath yarn wound around the core yarn side (inside) and an upper sheath yarn wound around the outside of the lower sheath yarn. In the present invention, the first conductive Metal-plated synthetic fiber Filament yarn and secondary conductivity Metal-plated synthetic fiber The filament yarns each form either a lower sheath yarn or an upper sheath yarn, but may form either one of the two.

[0023] The first conductive Metal-plated synthetic fiber The filament yarn covers the high-strength filament yarn in a Z-twist. Metal-plated synthetic fiber The high-strength filament yarn is covered with the S-twisted filament yarn. Prior to covering the high-strength filament yarn, the first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber The filament yarns may be individually twisted.

[0024] The first conductive Metal-plated synthetic fiber filament yarn and said second conductive Metal-plated synthetic fiber The filament yarn is a metal-coated filament yarn in which a metal coating is formed on a synthetic fiber filament yarn. do. Examples of synthetic fiber filament yarns include polyester filament yarns, nylon filament yarns, acrylic filament yarns, polyolefin filament yarns, vinylidene chloride filament yarns, aramid filament yarns, etc. Among these, polyester filament yarns are preferred in terms of versatility, chemical resistance, strength, etc.

[0025] The synthetic filament yarn is preferably a multifilament yarn, and the total fineness of the synthetic filament yarn is preferably 20 dtex to 120 dtex, more preferably 30 dtex to 80 dtex.

[0026] The number of filaments in the synthetic filament yarn is preferably 10 or more, more preferably 10 to 50, from the viewpoint of bending durability. The single yarn fineness of the synthetic filament yarn is preferably about 0.5 to 10 dtex.

[0027] The conductive filament yarn of the present invention can be obtained by coating the synthetic filament yarn with a metal coating. The synthetic filament yarn may be first twisted before forming the metal coating.

[0028] Examples of metals constituting the metal coating include silver, gold, copper, nickel, tin, zinc, and palladium. Furthermore, alloys containing these metals may also be used. Among these, silver and copper are preferred, and silver is more preferred, due to their excellent electrical conductivity.

[0029] The method for forming the metal coating may be a dry method such as vapor deposition or sputtering, but preferably a wet plating method is used. Wet plating methods include electroplating and electroless plating. The wet plating method can form a uniform metal coating on each filament yarn, even in the case of synthetic multifilament yarns.

[0030] The thickness of the metal coating is preferably 0.075 μm to 0.50 μm, and more preferably 0.1 μm to 0.3 μm. If the thickness of the metal coating is within the range of 0.075 μm to 0.50 μm, it is possible to achieve both excellent conductivity and flexibility.

[0031] The resulting conductive filament yarn preferably has a total fineness of 20 to 200 dtex, more preferably 40 dtex to 150 dtex, and the single yarn fineness is preferably about 0.5 to 20 dtex.

[0032] The obtained conductive filament yarn preferably has a resistance of 10,000 Ω / m or less, more preferably 1,000 Ω / m or less. Note that the resistance in the present invention is a value measured in accordance with JIS C 2525.

[0033] The first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber Filament yarn and copper plating Coated polyester filament yarn or silver plating Preferably, the coated polyester filament yarn is a silver coated polyester filament yarn. plating It is a coated polyester filament yarn.

[0034] In addition, the first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber The filament yarn preferably has substantially the same single yarn fineness, total fineness, number of filaments, etc. Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber Since the sheath yarn and the filament yarn are substantially identical, the stresses caused by the twisting of the two sheath yarns cancel each other out, resulting in a conductive yarn with excellent sewability.

[0035] The conductive yarn of the present invention comprises a non-twisted high strength filament yarn as a core yarn and a first conductive yarn as a sheath yarn. Metal-plated synthetic fiber Filament yarn and secondary conductivity Metal-plated synthetic fiber The first conductive yarn has a double covering yarn structure including a filament yarn. Metal-plated synthetic fiber The filament yarn is Z-twisted and covers the high-strength filament yarn. Metal-plated synthetic fiber The filament yarn is covered with the high strength filament yarn in an S twist.

[0036] The first conductive Metal-plated synthetic fiber The number of twists of the Z twist of the filament yarn and the second conductive Metal-plated synthetic fiber The twist number of the S-twist filament yarn is preferably 100 T / m to 1,000 T / m. If the twist number is within the range of 100 T / m to 1,000 T / m, a conductive yarn with excellent conductivity and high sewability can be obtained. Metal-plated synthetic fiber The more preferable twist number of the filament yarn is 100 T / m to 400 T / m.

[0037] The first conductive Metal-plated synthetic fiber The number of twists (Tz) of the Z twist of the filament yarn and the second conductivity Metal-plated synthetic fiber The ratio of the number of twists (Ts) in the S twist of the filament yarn is preferably Tz:Ts=1:0.8-1.2. More preferably, Tz:Ts=1:0.9-1.1, and even more preferably, Tz and Ts are the same. This improves the balance of stresses caused by twisting in the conductive yarn, and can prevent twisting and sagging of the conductive yarn during sewing.

[0038] The first conductive Metal-plated synthetic fiber filament yarn and the second conductive Metal-plated synthetic fiber As a method for double-covering the high-strength filament yarn with the filament yarn, a method using a conventional double-covering device can be adopted. In the method using the double-covering device, for example, a first conductive yarn is applied to a core yarn made of a non-twisted high-strength filament yarn fed from a feed roller. Metal-plated synthetic fiber The filament yarn is fed from the first spindle as a lower sheath yarn and covers the Z twist. Metal-plated synthetic fiber The filament yarn is fed from the second spindle as an upper sheath yarn and covered with an S twist. The double-covered yarn thus obtained is wound onto a winder via a delivery roller.

[0039] In the example of the double covering method, first, a first conductive Metal-plated synthetic fiber Covering with filament yarn is carried out, and then a second conductive Metal-plated synthetic fiber Although the covering is performed by the filament yarn, this order may be reversed. Metal-plated synthetic fiber The filament yarn is covered with an S twist and used as the upper sheath yarn. Metal-plated synthetic fiber The filament yarn may be covered in a Z twist.

[0040] The resulting conductive yarn preferably has a total fineness in the range of 50 to 2500 dtex, more preferably in the range of 200 to 1500 dtex. The resistance value of the obtained conductive yarn is not particularly limited, but is preferably 1000 Ω / m or less, and more preferably 500 Ω / m or less.

[0041] The conductive yarn of the present invention, which takes the form of a double-covered yarn obtained in this way, has a balance between the stress in the S twist direction and the stress in the Z twist direction, which makes it possible to suppress twisting and sagging of the conductive yarn during sewing. Furthermore, by using a non-twisted high-strength filament yarn as the core yarn, it is possible to limit the longitudinal elongation of the conductive yarn, resulting in the effect of reducing the risk of changes in resistance value and breakage.

[0042] The longitudinal elongation of the conductive yarn of the present invention is preferably 5% or less. If the longitudinal elongation of the conductive yarn is within the range of 5% or less, it is possible to form wiring in which the decrease in conductivity due to longitudinal pulling is suppressed. As a result, even when force is applied in the longitudinal direction during use, such as wearing, the resistance value is suppressed from increasing. The elongation measurement method in the present invention complies with JIS L 1095 (General spun yarn test method; 9.5; Single yarn tensile strength and elongation).

[0043] The conductive yarn of the present invention has highly durable conductivity and can be used for wiring in various electronic devices, etc. Furthermore, the conductive yarn of the present invention also has excellent sewability, making it particularly suitable for use in wiring placed on fabrics such as clothing.

[0044] The article with wiring of the present invention has wiring formed as a seam on a flexible substrate, such as a fabric, using the conductive yarn. Because the wiring is formed from the conductive yarn, it has the characteristics of high strength in the longitudinal direction and low elongation. Because the conductive yarn is used, the wiring has excellent flexibility and does not impair the inherent flexibility of the substrate.

[0045] One example of a means for forming the wiring on a substrate is sewing. The sewing may be done by hand, but a household or industrial sewing machine can also be used. That is, the conductive thread of the present invention can be used as a sewing thread. The conductive thread of the present invention has uniform stress due to twisting, so it can exhibit excellent sewability when sewn using a sewing machine. Even when forming wiring with a complex shape, twisting and sagging of the conductive thread can be suppressed. Because twisting and sagging of the conductive thread do not occur, short circuits do not occur even between two adjacent wirings, and it is possible to form a precise and fine wiring pattern.

[0046] The stitches for forming the wiring of the present invention include single chain stitching, hand stitching, lock stitching, double chain stitching, etc., and are not particularly limited. They can be appropriately selected depending on the position and purpose of forming the wiring.

[0047] Examples of articles having wiring made from the conductive yarn of the present invention, i.e., examples of substrates on which the wiring is formed, include fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics made from various fibers, sheets and films made from synthetic resins and natural resins, paper, and natural leather. Also, composite substrates may be used in which multiple substrates selected from these are bonded together. Examples of composite substrates include resin-coated fabrics and synthetic leather.

[0048] Examples of various fibers that can form fabrics include synthetic fibers such as polyester, polyamide, polyurethane, and polyethylene; natural fibers such as cotton, hemp, and silk; blends thereof; and mixed fibers thereof.

[0049] Examples of synthetic resins that can be used to form sheets, films, etc. include polyethylene, polyester, polyamide, polyurethane, polyvinyl chloride, etc. Examples of natural resins that can be used to form sheets, films, etc. include natural rubber, etc.

[0050] Examples of resin-coated fabrics include fabrics made by laminating a film or sheet made of synthetic resin with fabric, fabrics coated with synthetic resin and dried, etc. Examples of synthetic leather include fabrics coated with polyurethane resin. [Example]

[0051] The present invention will be described below with reference to examples, but the present invention is not limited to these examples. Evaluations in the examples were made according to the following methods.

[0052] [Conductivity evaluation] The conductive thread was pinched at both longitudinal ends with clip-type probes of a digital multimeter (PM3, manufactured by Sanwa Electric Instruments Co., Ltd.) and the resistance per meter of length was measured. The resistance measurement method complies with JIS C 2525.

[0053] [Elongation evaluation] Using a small tabletop testing machine (Shimadzu Corporation, EZ-Test), the conductive yarn was pinched at both ends in the longitudinal direction and stretched until it broke, and the elongation of the conductive yarn was measured. The elongation measurement method complies with JIS L 1095 (General spun yarn test method; 9.5; Single yarn tensile strength and elongation).

[0054] [Sewing ability evaluation] Using a polyester twill fabric (warp density 120 threads / inch, weft density 70 threads / inch) as the base material, five linear traces were sewn at 10 mm intervals with 50 stitches / 100 mm at 600 rpm using the obtained conductive thread. The sewing machine used was an embroidery sewing machine (Innovis VF1) manufactured by Brother Industries, Ltd. The distance between each linear trace was measured at 10 random points, the average value was calculated, and the maximum variation was calculated using the following formula 1. Based on the obtained maximum variation (%) and the results of visually checking the sewn area for the presence or absence of slack in the thread, the sewability was evaluated according to the following evaluation criteria. [Maximum variation (%) = |Lm-La| ÷ La × 100]

[0055]

number

[0056] Here, La is the average value of the measured distance between the wirings (10 points), and Lm is the maximum or minimum value of the distance between the wirings, whichever is larger in difference from the average value. (Evaluation criteria) ○: Maximum variation is less than 10% and there is no sagging △: Maximum variation is less than 10%, but sagging is observed ×: Maximum variation is 10% or more

[0057] [Wiring strength evaluation] As in the case of the sewability evaluation, the obtained conductive thread was used to sew a polyester twill fabric (10 mm wide, 120 mm long) in a straight line at the widthwise center of the base material, with 50 stitches per 100 mm, to produce an article with wiring formed as a seam. This was stretched 20 times in the longitudinal direction of the base material using a small tabletop testing machine (Shimadzu Corporation, EZ-Test) with a tensile load of 1.0 N / mm, and the rate of increase in resistance after the stretch test relative to the resistance before the stretch test was calculated using the following formula 2. Evaluation was based on the following evaluation criteria. [Resistance increase rate (%) = (Ra - Rb) ÷ Rb × 100]

[0058]

number

[0059] Here, Ra is the resistance value after the stretching test, and Rb is the resistance value before the stretching test. (Evaluation criteria) ○: Resistance increase rate is less than 5% △: Resistance increase rate is 5% or more but less than 10% ×: Resistance increase rate 10% or more

[0060] [Example 1] The core yarn used was an untwisted ultra-high molecular weight polyethylene filament yarn (total fineness 275 dtex / filament count 192 f, single yarn fineness 1.4 dtex). This yarn was Izanas (registered trademark) SK60 manufactured by Toyobo Co., Ltd. The tensile strength of the ultra-high molecular weight polyethylene fiber (high-strength fiber) used was 32 cN / dtex, and the tensile strength of the ultra-high molecular weight polyethylene filament yarn was 8800 cN.

[0061] Two silver-plated polyester filament yarns (total fineness after plating: 75 dtex / filament count: 24 f, single yarn fineness: 3.1 dtex) (manufactured by Seiren Co., Ltd.) were used as sheath yarns. These were polyester filament yarns (total fineness: 50 dtex / filament count: 24 f, single yarn fineness: 2.1 dtex) that had been pre-twisted and then electrolessly plated to form a silver coating (thickness: 0.19 μm). The resistance of this silver-plated polyester filament yarn was 240 Ω / m.

[0062] One sheath yarn (lower sheath yarn) was Z-twisted at a twist rate of 450 T / m, and the other sheath yarn (upper sheath yarn) was S-twisted at a twist rate of 450 T / m, and these were covered with the untwisted core yarn to obtain a conductive yarn. The resulting conductive yarn had a total fineness of 436 dtex, a resistance value of 129 Ω / m, and an elongation of 4.5%. A sewability test was conducted using the resulting conductive yarn, and the maximum variation in the inter-wire distance was 3.7%, with no slack, indicating good sewability. Furthermore, an evaluation of the wiring strength showed a resistance increase rate of 4.0%, indicating good durability against pulling.

[0063] [Example 2] A conductive yarn was produced in the same manner as in Example 1, except that the core yarn was an untwisted liquid crystal polyester yarn (total fineness 280 dtex / filament count 48 f, single yarn fineness 5.8 dtex), and various evaluations were carried out. The core yarn was Zexion (registered trademark) manufactured by KB Seiren Co., Ltd., and the tensile strength of the liquid crystal polyester fiber (high-strength fiber) used was 30 cN / dtex, and the tensile strength of the liquid crystal polyester yarn itself was 8400 cN.

[0064] The resulting conductive yarn had a total fineness of 448 dtex, a resistance of 134 Ω / m, and an elongation of 4.8%. A sewability test was conducted using the resulting conductive yarn, and the maximum variation in the distance between wires was 5.8%, with no slack, demonstrating good sewability. Furthermore, an evaluation of the wiring strength showed a resistance increase rate of 4.7%, indicating good durability against pulling.

[0065] [Comparative Example 1] A conductive yarn was produced in the same manner as in Example 1, except that the core yarn used was the same silver-plated polyester filament yarn (manufactured by Seiren Co., Ltd.) as the sheath yarn in Example 1. This silver-plated polyester filament yarn was produced by first twisting a polyester filament yarn (total fineness 50 dtex / filament count 24 f, single yarn fineness 2.1 dtex) made of polyester fiber with a tensile strength of 4.1 cN / dtex, and then forming a silver coating (thickness 0.19 μm) on it using an electroless plating method. After plating, the total fineness was 75 dtex / filament count 24 f, and the single yarn fineness was 3.1 dtex. The tensile strength of this silver-plated polyester filament yarn itself was approximately 300 cN.

[0066] The resulting conductive yarn had a total fineness of 250 dtex, a resistance of 89 Ω / m, and an elongation of 15.4%. When this conductive yarn was used in a sewability test, the maximum variation in the distance between wires was 2.7%, and there was no slack. Furthermore, when the wiring strength was evaluated, the resistance increase rate was 14.0%, indicating poor durability against tension.

[0067] Comparative Example 2 Two strands of the same silver-plated polyester filament yarn (manufactured by Seiren Co., Ltd.: 75 dtex / 24 f) as used in Comparative Example 1 were twisted together in an S twist with a twist count of 297 T / m, and separately, one strand of the same liquid crystal polyester yarn (manufactured by KB Seiren Co., Ltd., Zexion (registered trademark): 280 dtex / 48 f) as used in Example 2 was twisted together in an S twist with a twist count of 297 T / m, and both were twisted together in a Z twist with a twist count of 207 T / m to obtain a conductive yarn.

[0068] The resulting conductive yarn had a total fineness of 434 dtex, a resistance of 121 Ω / m, and an elongation of 5.3%. When a sewability test was conducted using the resulting conductive yarn, the maximum variation in the distance between wires was 6.3%, but a large amount of slack was confirmed. Furthermore, when the wiring strength was evaluated, the resistance increase rate was 9.1%, indicating insufficient durability against pulling.

[0069] [Table 1] [Industrial Applicability]

[0070] The conductive yarn of the present invention has the advantage of being flexible yet strong in the longitudinal direction, and maintaining high conductivity against deformation and tension. Therefore, it can be used to form flexible electrical wiring on flexible, insulating sheet-like substrates, not only for wearable devices such as clothing, but also for sofas, vehicle seats, curtains, bedding, etc. Wiring formed using the conductive yarn of the present invention can be used as signal lines and power supply lines, and can also function as the heat-generating part of a sheet-like heater. [Explanation of symbols]

[0071] 1: High strength filament yarn 2: First conductive filament yarn 3: Second conductive filament thread

Claims

1. A sewing thread for forming wiring made of conductive thread, characterized by comprising: an untwisted high-strength filament yarn having a tensile strength of 1,500 cN or more, the untwisted high-strength filament yarn being made of multifilament yarn with a total fineness of 200 dtex to 900 dtex and using high-strength fibers with a tensile strength of 20 cN / dtex or more; a first conductive metal-plated synthetic fiber filament yarn in which the high-strength filament yarn is covered in a Z twist; and a second conductive metal-plated synthetic fiber filament yarn in which the high-strength filament yarn is covered in an S twist.

2. 2. A sewing thread for forming wiring, comprising the conductive thread according to claim 1, which has a resistance value of 1000 Ω / m or less.

3. 3. A sewing thread for forming wiring made of the conductive yarn according to claim 1, wherein the ratio of the number of twists (Tz) of the Z twist of the first conductive metal-plated synthetic fiber filament yarn covering the high-strength filament yarn to the number of twists (Ts) of the S twist of the second conductive metal-plated synthetic fiber filament yarn is Tz:Ts = 1:0.8 to 1.

2.

4. 4. A sewing thread for forming wiring made of the conductive thread according to claim 1, wherein the high-strength fiber is an ultra-high molecular weight polyethylene fiber.

5. The sewing thread for forming wiring made of the conductive thread according to any one of claims 1 to 4, characterized in that the first conductive metal-plated coated synthetic fiber filament yarn and the second conductive metal-plated coated synthetic fiber filament yarn are both copper-plated coated polyester filament yarn or silver-plated coated polyester filament yarn.

6. An article having wiring made of a sewing thread for forming wiring, which is made of the conductive thread according to any one of claims 1 to 5.

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