Wire and winding grip

Abstract

To provide a wire that is light in weight, capable of being easily handled, non-corrosive, and maintenance free, and can be suitably used for connection or protection of cables, and also to provide a winding grip formed of the wire.SOLUTION: A wire for cable connection or cable protection is constituted of a fiber reinforcement resin wire made by impregnating a bundle of reinforcement fibers with resin and has a helical structure made by forming the wire into spiral shape at least on both ends of the wire.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a wire. More specifically, the present invention relates to a fiber-reinforced resin wire suitable for connecting or protecting cables. The present invention also relates to a wrap-around grip made of the wire.

[0002] Conventionally, wires known as winding grips, which are used to connect cables to one another or to connect cables to fixed structures such as posts, and armor rods, which are used to cover and protect cables, have been known.

[0003] These wires are made of galvanized steel wire, or wire made by twisting together several galvanized steel wires and fixing them with an adhesive, with a spiral structure given to at least both ends, and the spiral structure is wrapped around a cable and joined to grip and connect it, or to cover and protect the surface.

[0004] A problem with winding grips made of galvanized steel wire is that, due to their high rigidity, a large force is required to wind the spiral structure around a cable or remove it, resulting in poor workability. To solve this problem, for example, Patent Document 1 proposes a technology that uses a dedicated winding device, and Patent Document 2 proposes a technology that provides a removal part at the tip of the winding grip that can be hooked with a finger.

[0005] However, galvanized steel wire grips are heavy and difficult to transport and handle, and galvanized steel wire grips and armor rods corrode and lose their gripping power and protective function, necessitating inspection and replacement every few years. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-72767 [Patent Document 2] JP 2016-187255 A Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the present invention aims to solve the above problems and provide a wire that is lightweight, easy to handle, corrosion-free and maintenance-free, and is suitable for connecting or protecting cables, and further to provide a wrap-around grip made of said wire. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to solve the above problems and have completed the present invention. That is, one aspect of the present invention is a wire material as described below in (1) to (4).

[0009] (1) A wire for connecting or protecting cables, which is composed of a fiber-reinforced resin wire made of a bundle of reinforcing fibers impregnated with resin, and has a spiral structure in which the wire is formed in a spiral shape at least on both ends of the wire.

[0010] (2) At least a part of the bundle of reinforcing fibers may be twisted at 2 to 50 times / m.

[0011] (3) The bundle of reinforcing fibers may be covered with a knitted cord or a braided cord.

[0012] (4) The resin may be a thermoplastic resin.

[0013] Another aspect of the present invention includes the following wrap grips (5) to (7).

[0014] (5) A winding grip made of the cable connecting wire material described in (1) to (4) above.

[0015] (6) The durometer hardness (type D) of the resin is preferably 40 or more and 80 or less.

[0016] (7) It is preferable that the surface of the wrap-around grip is coated with paint having a static friction coefficient of 0.20 or more with respect to the SUS304 block. Effect of the Invention

[0017] The wire according to the present invention is lightweight, easy to handle, non-corrosive and maintenance-free, and is suitable for use in connecting or protecting cables. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the following embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0019] <Wire rod> The wire in this embodiment is composed of a fiber-reinforced resin wire made of a bundle of reinforcing fibers impregnated with resin, and is a wire for cable connection or cable protection having a spiral structure in which the wire is formed in a spiral shape at least on both ends of the wire.

[0020] The wire according to the present embodiment has a bundle of reinforcing fibers as a core material. The material of the reinforcing fibers in the present embodiment is not particularly limited as long as it is a chemically inactive material, and inorganic fibers, organic fibers, or a combination of these can be used. Specifically, carbon fibers, graphite fibers, silicon carbide fibers, alumina fibers, tungsten carbide fibers, boron fibers, glass fibers, basalt fibers, aramid fibers, polyparaphenylene benzobisoxazole fibers, polyarylate fibers, polyphenylene sulfide fibers, polyimide fibers, fluorine fibers, etc. are listed. From the viewpoints of being lightweight, having high strength, being relatively easy to obtain, and being easy to handle, the material of the reinforcing fibers is preferably carbon fiber or basalt fiber.

[0021] The reinforcing fiber bundle according to the present embodiment uses a reinforcing fiber obtained by bundling a plurality of reinforcing fibers (usually several thousand to several hundred thousand) aligned in the length direction. The number of fibers to be bundled may be appropriately selected in consideration of the thickness and strength of the wire to be obtained. Specifically, the number of reinforcing fibers to be bundled is, for example, 1000 or more and 150000 or less. If the number of fibers to be bundled is 1000 or more, it is easy to ensure sufficient strength of the fiber-reinforced resin wire (element wire), and if the number of fibers to be bundled is 150000 or less, sufficient flexibility is exhibited when imparting a helical structure to the fiber-reinforced resin wire, and the wire is less likely to break during processing. Note that, when a bundle of reinforcing fibers purchased from a reinforcing fiber manufacturer is further twisted together and used as a bundle of reinforcing fibers, the total number of reinforcing fibers is the number of the bundle of reinforcing fibers.

[0022] The bundle of reinforcing fibers may be untwisted, but preferably at least a part of the bundle of reinforcing fibers is twisted a predetermined number of times. By twisting at least a part of the bundle of reinforcing fibers a predetermined number of times, when the wire is twisted or bent, such as by forming a spiral structure in the wire or bending it into a U-shape, the reinforcing fibers are prevented from breaking, or the bundle of reinforcing fibers is separated and the filaments of the reinforcing fibers are prevented from protruding from the wire. In addition, when the bundle of reinforcing fibers is covered with a knitted or braided cord, as described below, the bundle of reinforcing fibers is twisted to a cylindrical shape, which stabilizes the work of covering with the knitted or braided cord, and the unevenness formed by the twisting is engaged with the knitted or braided cord, making it difficult to slip. In addition, when a bundle of reinforcing fibers purchased from a reinforcing fiber manufacturer is used as a core material by further twisting multiple strands, all of the multiple strands may be twisted, or the untwisted bundle may be used as a center line and the remaining bundles may be twisted around the center line.

[0023] The number of twists in the reinforcing fiber bundle is preferably 2 to 50 times / m, more preferably 5 to 40 times / m, and most preferably 10 to 30 times / m. If the number of twists in the reinforcing fiber bundle is too small, the above-mentioned effects may not be fully exhibited, and if the number of twists in the reinforcing fiber bundle is too large, the reinforcing fibers may break.

[0024] The core material made of a bundle of reinforcing fibers is preferably covered with a braided or woven cord (covered cord). Covering the core material with a covering cord has the effect of preventing the reinforcing fibers from being cut by contact with a sharp object, and preventing the reinforcing fibers from breaking by deforming when a shear force is applied to the wire, thereby releasing the stress.

[0025] The material for the braided or woven cord is not particularly limited, and may be natural fiber, chemical fiber, or a combination of these.Specific examples of the material for the braided or woven cord include cotton, hemp, flax, polyamide fiber, aramid fiber, vinylon fiber, acrylic fiber, polyethylene fiber, polypropylene fiber, polyvinyl chloride fiber, polyester fiber, polyacetal fiber, glass fiber, alumina fiber, and basalt fiber.

[0026] The method of covering the surface of the core material with the knitted or braided cord made of the above material is not particularly limited as long as it can cover the core material in a cylindrical shape, and specific examples include circular knitting, round braiding, etc. Round braiding is preferred because it has appropriate hardness and flexibility and is stable in shape.

[0027] The wire according to the present embodiment is made of fiber-reinforced resin wire obtained by impregnating the bundle of reinforcing fibers with resin. Specifically, the wire according to the present embodiment is a fiber-reinforced resin wire obtained by impregnating the bundle of reinforcing fibers with resin. By impregnating the bundle of reinforcing fibers with resin, the bundle of reinforcing fibers is integrated, and the strength of the wire can be expressed.

[0028] The resin (matrix resin) to be impregnated into the bundle of reinforcing fibers in this embodiment is not particularly limited, but a thermoplastic resin, a thermosetting resin, or a combination of these can be used. Specifically, examples of the resin to be impregnated into the bundle of reinforcing fibers include polyolefins such as polyethylene and polypropylene, polystyrene, polyamide, (meth)acrylic resins, polyvinyl chloride, polyvinylidene chloride, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate, ABS resin, novolac, polyether ether ketone, polysulfone, polyphenylene oxide, polyetherimide, amorphous polyarylate, phenoxy resin, epoxy resin, polyurethane, unsaturated polyester, resol resin, polyimide, and silicone resin. It is preferable to use a thermoplastic resin as the resin to be impregnated into the bundle of reinforcing fibers, because it does not require attention to storage of prepreg (fiber-reinforced resin in a semi-cured state), it can be softened by heating and fixed in shape by cooling after shaping, and it is highly tough and does not easily break. From the viewpoints of dimensional stability, weather resistance, and water resistance, the resin impregnated into the bundle of reinforcing fibers is preferably a phenoxy resin or an epoxy resin, and when a thermoplastic resin is used as the resin impregnated into the bundle of reinforcing fibers, a phenoxy resin is the most preferable. Note that the phenoxy resin refers to an epoxy resin whose molecules are linear or have a low crosslinking density or branching to the extent that the thermoplasticity is not lost.

[0029] In addition, when manufacturing a wrap-around grip, the durometer hardness (type D) of the resin impregnated in the bundle of reinforcing fibers is preferably 40 or more and 80 or less. When the durometer hardness of the resin is 40 or more, the resin is less likely to become uneven in thickness due to the pressure applied when connecting or protecting the cable, and is easy to exhibit strength. When the durometer hardness of the resin is 80 or less, the resin is appropriately deformed by pressure, and the gap between the cable and the wire of the present invention can be filled without any gaps, and the effect of increasing the gripping force of the cable is obtained. A more preferable range of the durometer hardness is 55 or more and 75 or less. The durometer hardness of the resin may be appropriately adjusted depending on the type of resin used, the molecular weight, the degree of molecular branching, the degree of crosslinking or vulcanization, the addition of a plasticizer, and the like.

[0030] The resin may be impregnated into the bundle of reinforcing fibers by a known method. Specifically, a method of heating and melting a thermoplastic resin and applying it to the bundle of reinforcing fibers, a method of applying a thermosetting resin in a B-stage (semi-cured) state to the bundle of reinforcing fibers, a method of applying a monomer or oligomer having a relatively low molecular weight and low viscosity to the bundle of reinforcing fibers and then polymerizing and curing it (in-situ polymerization method), etc. may be mentioned. From the viewpoint of uniformly impregnating the inside of the bundle of reinforcing fibers with the resin and fully expressing the strength of the fiber-reinforced resin, it is preferable to impregnate the bundle of reinforcing fibers with the resin by the in-situ polymerization method. Note that the method of applying the resin to the bundle of reinforcing fibers may be performed by a known method such as immersing the bundle of reinforcing fibers in the resin, applying the resin with a brush or coater, or transferring the resin from a film or roller formed on a release material to the bundle of reinforcing fibers.

[0031] Furthermore, depending on the characteristics of the resin used, a process for promoting necessary chemical reactions such as curing and polymerization, such as heating, humidification, irradiation with active energy rays, curing, etc., may be added. When a thermosetting resin is used as the matrix resin, it is preferable to perform shaping into a predetermined shape including a helical structure described later before the process for promoting the curing reaction, since shaping becomes difficult after complete curing.

[0032] As described above, when the core material made of a bundle of reinforcing fibers is covered with a knitted cord or a braided cord, the bundle of reinforcing fibers may be impregnated with resin and then covered with the knitted cord or the braided cord, or the bundle of reinforcing fibers may be covered with the knitted cord or the braided cord and then the whole may be impregnated with resin. From the viewpoint of integrally bonding the bundle of reinforcing fibers and the covering cord and suppressing misalignment between the core material and the covering cord, it is preferable to cover the bundle of reinforcing fibers with the covering cord and then impregnate the whole with resin.

[0033] The obtained wire may be further coated with a paint containing a coloring agent, a protective agent, etc., for the purpose of improving design and weather resistance. In particular, by coating the wire with a paint containing inorganic particles such as titanium oxide particles or ceramic particles as a paint containing a coloring agent or a protective agent, excellent weather resistance can be imparted to the wire. However, when manufacturing a wrap-around grip, it is advisable to appropriately adjust the size and amount of particles contained in the paint so as not to adversely affect the static friction coefficient described below.

[0034] In addition, when manufacturing the wrap-around grip, it is preferable that the surface of the wrap-around grip is coated with paint having a static friction coefficient of 0.20 or more with the SUS304 block. By making the static friction coefficient between the wrap-around grip and the SUS304 block 0.20 or more, the gripping strength can be increased. A more preferable static friction coefficient between the wrap-around grip and the SUS304 block is 0.25 or more. The static friction coefficient between the wrap-around grip and the SUS304 block can be improved by selecting a material with a high friction coefficient as the paint or particles in the paint, or by providing appropriate fine surface irregularities.

[0035] By the above method, a fiber-reinforced resin wire according to the present embodiment is obtained by impregnating a bundle of reinforcing fibers with resin. The obtained wire (strand) may be used alone or as a bundle of strands of strands. The strands may be arranged in a planar or cylindrical form or twisted together like a rope. When the wire according to the present embodiment is used as a winding bind or lashing rod, it is preferable to use a single strand of strands, and when used as a winding grip or armor rod, it is preferable to use a bundle of strands of strands.

[0036] When the wires are bundled, the number of wires to be bundled may be appropriately selected taking into consideration the thickness and strength of the cable to be wound.

[0037] When a plurality of wires are twisted together like a rope, it is advisable to untwist both ends of the twisted bundle of wires in preparation for the subsequent process of forming the spiral structure.

[0038] The wire according to the present embodiment has a helical structure at least on both ends. By winding the helical structure around a cable, the cable can be connected to another cable or a fixed object, or the surface of the cable can be protected. The helical structure is a wire itself that is partly shaped into a helical shape. Specifically, the helical structure is a wire or a bundle of wires that constitutes the wire that is partly shaped into a helical shape. The helical structure can be formed by rotating the wire or the bundle of wires in a twisted manner. As an example, the inner diameter and pitch of the helical structure are constant, but are not limited to this. That is, the inner diameter of the helical structure may be gradually larger or smaller in the winding direction, and the pitch of the helical structure may be random. In addition, the helical structure is formed by shaping the wire or the bundle of wires without leaving any gaps in the winding direction so as to be packed tightly, but is not limited to this. That is, in the helical structure, the wire or the bundle of wires may be wound with gaps throughout or partially.

[0039] The method of forming a spiral structure in the wire or the bundle of wires is not particularly limited, and the spiral structure may be formed by a known method. For example, when a thermoplastic resin is used as the matrix resin, the spiral structure can be formed as follows. First, a wire or a bundle of wires of a predetermined length is cut out from the wire obtained above. Next, the wire or the bundle of wires is wound in a spiral shape at a predetermined pitch while being heated to a temperature at which the matrix resin softens or above, and aligned with a round bar that has been subjected to a release treatment or a rod-shaped mold with a groove in advance. Then, the wire or the bundle of wires is temporarily fixed with tape or a clip, and the wire is cooled, and then the temporary fixation and the rod or the mold are removed. In this way, the spiral structure can be formed in the wire or the bundle of wires. On the other hand, when a thermosetting resin is used as the matrix resin, the wire or the bundle of wires can be wound around the rod or the like at the stage before the step of promoting the curing reaction (prepreg) and then the curing reaction is promoted to form the spiral structure.

[0040] In addition, in order to fit a thimble or insulator, or to wind it around a support or the like to lock it in place, the wire may be shaped in a way other than the helical structure at both ends, for example by providing a U-shaped bent portion (ring portion) in the center of the wire. When bending the center of the winding grip, it is advisable to adjust the length of both ends and the pitch of the helical structure so that the helical structures at both ends can fit together.

[0041] <Wrap-around grip> The wire according to the present embodiment has high breaking strength and a strong gripping force for a cable, and is therefore particularly suitable for use as a winding grip.

[0042] When using a wire as a winding grip, it is preferable to use a wire made of bundled wires in order to achieve higher breaking strength and gripping strength.

[0043] The wrap grip may be straight in shape for connecting cables together, or it may have a U-shaped loop for fitting a thimble or insulator, or for wrapping around a post or the like and securing it.

[0044] The ratio of the length of the portion having a spiral structure to the total length of the wrap grip is increased as the ratio of the length of the portion having a spiral structure increases, but it also leads to an increase in weight and deterioration of workability. In areas with mild climates, a wrap grip with a light weight and good workability is used by reducing the ratio of the length of the portion having a spiral structure, and in areas that need to withstand typhoons and snowstorms, a wrap grip with a high grip strength is used by increasing the ratio of the length of the portion having a spiral structure. The ratio of the length of the portion having a spiral structure may be appropriately set according to the conditions of use. Specifically, in the case of a wrap grip having a linear shape, when the total length of the wrap grip is taken as 100%, the ratio of the length of the portion having a spiral structure is preferably 80% or more, and it is more preferable that the entire wire has a spiral structure. On the other hand, in the case of a wrap grip having a ring portion, the ratio of the length of the portion having a spiral structure is preferably 60% or more and 95% or less, and more preferably 70% or more and 85% or less.

[0045] In addition, in the case of a winding grip having a ring, if there is a winding surplus length (a gap between both ends), the winding surplus length can be grasped and used, improving the workability when winding and unwinding the winding grip around a cable. A specific winding surplus length is preferably 10 mm to 90 mm. Note that the winding surplus length is not included in the overall length of the winding grip.

[0046] In addition, when the cable to be connected is a twisted wire, it is preferable to align the twist direction of the cable to be connected with the direction of the spiral structure of the winding grip, since this increases the gripping strength.

[0047] When used as a wrap grip with a ring, it is preferable that the central part that is bent into a U-shape is left as a twisted wire structure by twisting multiple wires together, and that the ends that are wound around the cable are untwisted and then formed into a spiral structure. By having a twisted wire structure in the central part, the problem of the bundle of wires coming apart can be suppressed. In addition, it is preferable to form a spiral structure while adjusting the length of both ends and the pitch of the spiral structure so that the spiral structures at both ends can be interlocked with each other.

[0048] (Example) The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following examples, various performance measurements, tests and evaluations were carried out by the following methods.

[0049] <Durometer hardness of resin> The measurement was performed using a type D durometer in accordance with JIS K7215 (1986). Measurements were performed at five different points, and the average value was taken as the durometer hardness.

[0050] <Surface static friction coefficient> A resin or paint was applied to a PET film so that it was smooth and of uniform thickness, and then cured to prepare a test specimen. A SUS304 block with a handle, having a smooth surface measuring 60 mm wide x 120 mm long and weighing 1000 g, was placed on the test specimen, and a spring scale was hooked onto the handle. The spring scale hooked onto the handle was pulled horizontally, and the load of the spring scale was read at the moment the block began to move. This test was repeated five times, and the average value of the load (unit: g force) read was divided by 1000 to obtain the static friction coefficient between the SUS304 block and the paint.

[0051] <Appearance (filament protrusion)> The entire wire was visually inspected to count the number of locations where reinforcing fiber filaments protruded from the wire.

[0052] <Grip strength test> A test specimen was prepared by gripping a carbon fiber composite strand (Komatsu Matere Co., Ltd., Cabocoma Strand Rod, product number: NH2437) by fitting a helical structure at both ends of the wire. Both ends of the test specimen were gripped by a tensile tester, and the load was increased to 75% of the specified load in one go, and then from 75% to 100% at a rate of 0.98 kN / sec. The distance between the gripping positions immediately after the 100% load was applied was measured with a laser distance meter. The condition was maintained for 3 minutes, and the distance between the gripping positions was measured after 3 minutes. The difference in the distance before and after (amount of slippage) was calculated and used as the gripping force.

[0053] Example 1 A bundle of 60,000 carbon fibers was impregnated with thermosetting epoxy resin to prepare a single untwisted linear prepreg that was semi-cured to a B-stage state.

[0054] The linear prepreg was fitted into a mold with a spiral inner diameter of 17 mm and a cross-sectional width of 5.0 mm to form a spiral structure over the entire wire, and the mold was heated in an oven at 175°C for 2 hours to completely harden it. The wire was then removed from the mold to obtain a fiber-reinforced resin wire with a diameter of 2.6 mm and a spiral structure over the entire wire.

[0055] The obtained wire was manufactured without using any corroding materials, and had a mass of 17 g / m, which is lighter than the 64 g / m of a lashing rod (diameter: 2.6 mm) made of zinc-plated hard steel wire of the same specification. Although five places where the carbon fiber filaments were partially protruding were confirmed, the wire was suitable for use as a lashing rod.

[0056] Example 2 Two bundles of 24,000 carbon fibers were prepared and twisted 10 times / m to form a core material. The core material was impregnated with phenoxy resin monomer and a curing catalyst, and heat-treated in an oven at 150°C for 20 minutes to obtain a fiber-reinforced resin wire (strand) with phenoxy resin (weight average molecular weight = 55,000) as the matrix resin.

[0057] The wire obtained was heated to 180°C to soften it, and then fitted into a mold with a spiral inner diameter of 17 mm and a cross-sectional width of 5.0 mm to form a spiral structure throughout the entire wire. It was then allowed to cool at room temperature. The wire was then removed from the mold to obtain a fiber-reinforced resin wire with a diameter of 2.3 mm and a spiral structure throughout.

[0058] The obtained wire was manufactured without using any corroding materials, had a mass of 15 g / m, and no protruding carbon fiber filaments were observed, making it suitable for use as a lashing rod.

[0059] Next, the wire was heated to 180°C to soften it, and then fitted into a mold with a spiral inner diameter of 24 mm and a cross-sectional width of 5.5 mm to form a spiral structure with a different pattern throughout the wire, and then allowed to cool. The wire was then removed from the mold to obtain a fiber-reinforced resin wire with a spiral structure with a different pattern throughout.

[0060] No protruding carbon fiber filaments were found in the obtained wire, and it could be suitably used as a lashing rod of a different size than the previous one.

[0061] Example 3 Six prepregs were prepared as in Example 1, twisted together to form a rope, and then cut into a length of approximately 170 cm.

[0062] A 44 mm diameter mold was placed on the approximate center of the length of the rope-like prepreg, and the prepreg was bent into a U-shape. The two end portions of the bent prepreg were untwisted to a point approximately 640 mm from the end. Both ends of each of the untwisted prepreg were spirally wound around a rod-shaped mold with grooves at a pitch of 98 mm using an S-twist.

[0063] The wire along the mold was heated in an oven at 175°C for 2 hours to completely harden it. After that, the wire was removed from the mold to obtain a fiber-reinforced resin wire having a spiral structure on both ends.

[0064] The obtained wire was manufactured without using any corroding materials, had a total length of about 800 mm, a loop length (length of the U-shaped portion) of about 160 mm, an inner diameter of the loop of 40 mm, and had an S-twisted helical structure on both ends, forming a winding grip shape with a pitch length of 98 mm in the helical portion. Various evaluation results are shown in Table 1.

[0065] Example 4 Six wires similar to those used in Example 2 were prepared, and the six wires were twisted together in an environment of 100° C. to form a rope, which was then cut into a length of approximately 170 cm.

[0066] The wire was heated to 180°C to soften it, and then a 44mm diameter mold was placed at approximately the center of the wire's length and bent into a U-shape. The two end portions of the bent wire were untwisted up to a point 640mm from the end. Both ends of each of the untwisted end portions were spirally wound around a rod-shaped mold with grooves at a pitch of 98mm using an S-twist. After cooling at room temperature, the wire was removed from the mold to obtain a fiber-reinforced resin wire with a spiral structure at both ends.

[0067] The obtained wire was manufactured without using any corroding material, and had an S-twisted helical structure at both ends, and had the same shape as the wire in Example 3. The various evaluation results are shown in Table 1.

[0068] Example 5 Two bundles of 24,000 carbon fibers were prepared, and the two were twisted 10 times / m to form one core material, which was then covered with a round braided glass fiber cord. The core material covered with the braid was then impregnated with a phenoxy resin monomer and a curing catalyst, and heat-treated in an oven at 150°C for 20 minutes to obtain a strand with a braided cord covering and phenoxy resin (weight average molecular weight = 52,000) as the matrix resin.

[0069] A fiber-reinforced resin wire having a spiral structure at both ends was obtained in the same manner as in Example 4, except that the wire having the braided coating was used as the wire.

[0070] The obtained wire was manufactured without using any corroding material, and had an S-twisted helical structure at both ends, and had the same shape as the wire in Example 3. The various evaluation results are shown in Table 1.

[0071] Example 6 The wire with the braided coating used in Example 5 was coated with titanium oxide and ceramic particles (D 50 = 50 μm) was applied to the wire and allowed to dry to coat the wire surface.

[0072] A fiber-reinforced resin wire having a spiral structure at both ends was obtained in the same manner as in Example 4, except that the wire having the surface coated with paint was used as the wire.

[0073] The obtained wire was manufactured without using any corroding material, and had an S-twisted helical structure at both ends, and had the same shape as the wire in Example 3. The various evaluation results are shown in Table 1.

[0074] Example 7 Two bundles of 24,000 carbon fibers were prepared, and the two were twisted 10 times / m to form one core material, which was then covered with a round braided glass fiber cord. The core material covered with the braid was then impregnated with a phenoxy resin monomer and a curing catalyst, and heat-treated in an oven at 150°C for 7 minutes to obtain a fiber-reinforced resin strand with a braided cord covering and phenoxy resin (weight average molecular weight = 8500) as the matrix resin.

[0075] A fiber-reinforced resin wire having a spiral structure at both ends was obtained in the same manner as in Example 6, except that the wire obtained above was used as the wire.

[0076] The obtained wire was manufactured without using any corroding material, and had an S-twisted helical structure at both ends, and had the same shape as the wire in Example 3. The various evaluation results are shown in Table 1.

[0077] Example 8 The coating material is a mixture of titanium dioxide and ceramic particles (D 50 A fiber-reinforced resin wire having a spiral structure at both ends was obtained in the same manner as in Example 6, except that a white paint containing a fine particle diameter of 100 μm was used.

[0078] The obtained wire was manufactured without using any corroding material, and had an S-twisted helical structure at both ends, and had the same shape as the wire in Example 3. The various evaluation results are shown in Table 1.

[0079] Comparative Example 1 A wrap grip made of galvanized steel wire with an artificial abrasive applied to the surface (J-Witex Co., Ltd., for thimbles, type: 70 mm) 2 The evaluation results are shown in Table 1.

[0080] [Table 1]

Claims

1. A wire for connecting or protecting cables, which is composed of a fiber-reinforced resin wire formed by impregnating a bundle of reinforcing fibers with resin, and has a spiral structure in which the wire is formed in a spiral shape at least on both ends of the wire.

2. 2. The wire for connecting or protecting a cable according to claim 1, wherein at least a part of the bundle of reinforcing fibers is twisted at 2 to 50 times / m.

3. 2. The wire rod for connecting or protecting a cable according to claim 1, wherein the bundle of reinforcing fibers is covered with a braided cord or a braided cord.

4. 2. The wire for connecting or protecting a cable according to claim 1, wherein the resin is a thermoplastic resin.

5. A winding grip made of the wire for connecting cables according to any one of claims 1 to 4.

6. 6. The wrap-around grip according to claim 5, wherein the resin has a durometer hardness (type D) of 40 or more and 80 or less.

7. 6. The wrap-around grip according to claim 5, wherein the surface is coated with paint having a static friction coefficient of 0.20 or more with respect to the SUS304 block.

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