JP5926934B2 - Electric wire manufacturing method and electric wire - Google Patents

Description

  The present invention relates to an electric wire manufacturing method and an electric wire.

  In recent years, the tensile strength fibers such as aramid fiber, PBO (poly (p-phenylenebenzobisoxazole) fiber, and polyarylate fiber) have been plated or the tensile strength fiber is made of metal for the purpose of increasing strength, reducing weight and bending resistance. A metal-coated fiber in which a foil is wound has been proposed, and an electric wire in which this metal-coated fiber is used as a conductor and covered with an insulator has also been proposed (see, for example, Patent Documents 1 to 3).

JP 2011-153365 A JP 2008-130241 A JP 2009-242839 A

  Here, in the production of an electric wire in which an insulator is coated on a metal-coated fiber, an extrusion method using an extruder is used. However, when the insulator is coated by the extrusion method, since the metal-coated fiber is passed through the die of the extruder, there is a possibility that the metal-coated fiber is caught in contact with the die and disconnected. In particular, since the diameter of the aramid fiber is as thin as 12 μm, for example, when it is caught in a burr of a die, it is very easy to break.

  Furthermore, as described above, the electric wire uses a metal-coated fiber in which a thin metal film is formed on a tensile strength fiber as a conductor. For this reason, there exists a problem that the metal film of a metal-coated fiber tends to peel at the time of use of the electric wire after manufacture. For example, when the electric wire is bent, the metal film may be peeled off due to friction with the insulator.

  Note that the above problem is not limited to a wire having a single metal-coated fiber as a conductor and coated with an insulator, but a conductor after twisting a plurality of metal-coated fibers and insulating it. It is a common problem even with an electric wire covered with a body and a plurality of tensile strength fibers collectively subjected to plating to form a metal-coated fiber, which is covered with an insulator.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an electric wire manufacturing method capable of reducing the possibility of disconnection of a metal-coated fiber, and a metal An object of the present invention is to provide an electric wire capable of reducing the possibility of film peeling.

The method for producing an electric wire of the present invention is a method for producing an electric wire obtained by coating an insulating layer on a metal-coated fiber in which a metal film is formed on the outer periphery of a tensile strength fiber, and before coating the insulating layer by an extruder, It has the process of apply | coating the liquid lubricant of an animal and vegetable oil type | system | group to the outer periphery of a metal-coated fiber.

  According to the method for producing an electric wire of the present invention, since the step of applying a lubricant to the outer periphery of the metal-coated fiber is performed before the insulating layer is coated by the extruder, the metal-coated fiber is applied by the lubricant applied to the outer periphery. It becomes difficult to get caught in the die, and the possibility of disconnection of the metal-coated fiber can be reduced.

Furthermore , the lubricant is a liquid lubricant for animal and vegetable oil systems. Here, the liquid lubricants of animal and vegetable oil systems have an affinity for metals, so there is less oil adhesion to the die than oil system lubricants, and the adhered oil solidifies and affects the insulation layer coating. Can be reduced.

Further, the electric wire of the present invention is interposed between the metal coating fibers forming a metal film on the outer periphery of the tensile strength fibers, and an insulating layer covering the outer periphery of the metal coating fibers, a metal coating fibers and the insulating layer, animal and vegetable oil system And a lubricant layer made of a liquid lubricant .

According to the electric wire of the present invention, since the lubricant layer made of a liquid lubricant is interposed between the metal-coated fiber and the insulating layer, for example, when the electric wire is bent, the lubricant layer is insulated from the metal-coated fiber. Friction with the layer will be reduced. Thereby, for example, even if the metal film of the metal-coated fiber is thin, the metal film can be made difficult to peel off due to friction. Therefore, the possibility of peeling of the metal film can be reduced. Furthermore, it is possible to provide a superior electric wire with a concentricity.

  According to the method for manufacturing an electric wire of the present invention, it is possible to provide a method for manufacturing an electric wire that can reduce the possibility of disconnection of the metal-coated fibers. Moreover, according to the electric wire of this invention, the possibility of peeling of a metal film can be reduced.

It is sectional drawing which shows the structure of the electric wire which concerns on embodiment of this invention. It is the schematic which shows the manufacturing method of the electric wire which concerns on this embodiment, Comprising: The formation process of a lubricant agent layer is shown. It is the schematic which shows the manufacturing method of the electric wire which concerns on this embodiment, Comprising: The formation process of the insulating layer is shown. It is a graph which shows the conditions, such as a disconnection by the manufacturing method of the electric wire which concerns on a comparative example, and the manufacturing method of the electric wire which concerns on this embodiment. It is a chart which shows the concentricity of an electric wire at the time of using oil system lubricant and animal and vegetable oil system lubricant. It is the schematic which shows the manufacturing method of the electric wire which concerns on this embodiment, Comprising: The formation process of an insulating layer and the application | coating process of a lubricant are shown.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an electric wire according to an embodiment of the present invention. An electric wire 1 shown in FIG. 1 includes a metal-coated fiber 10, an insulating layer 20, and a lubricant layer 30.

  The metal-coated fiber 10 includes a tensile strength fiber 11 and a metal film 12 provided on the outer periphery of the tensile strength fiber 11. Here, the tensile strength fiber 11 is a fiber having high strength, light weight, and excellent bending resistance, such as para-aramid fiber, PBO fiber, polyarylate fiber, and high molecular weight polyethylene fiber.

  The metal film 12 is comprised from copper, such as annealed copper and pure copper, or a copper alloy containing these. The metal film 12 is formed, for example, on the tensile strength fiber 11 by immersing the tensile strength fiber 11 in a plating tank, or formed by winding a metal foil made of copper or a copper alloy on the tensile strength fiber 11. . The metal film 12 is not limited to copper or a copper alloy, but may be another conductor such as aluminum.

  The insulating layer 20 is a member coated on the metal-coated fiber 10 and is constituted by a non-conductive member. The lubricant layer 30 is interposed between the metal-coated fiber 10 and the insulating layer 20 and is made of a lubricant. The term “lubricant” as used herein is a concept that includes both oil-based and animal and vegetable oil-based lubricants. In addition, although mentioned later, when manufacturing the electric wire 1 which concerns on this embodiment, the lubricant layer 30 has desirable the liquid lubricant of an animal and vegetable oil type | system | group.

  In such an electric wire 1, for example, when the electric wire is bent, the friction between the metal-coated fiber 10 and the insulating layer 20 is reduced by the lubricant layer 30. Thereby, for example, even if the metal film 12 of the metal-coated fiber 10 is in a thin state, the metal film 12 becomes difficult to peel off due to friction.

  Next, the manufacturing method of the electric wire 1 which concerns on this embodiment is demonstrated. First, in this embodiment, the metal-coated fiber 10 is manufactured. At this time, the metal-coated fiber 10 is manufactured by plating the tensile strength fiber 11, attaching a metal foil to the tensile strength fiber 11, or winding the metal foil around the tensile strength fiber 11.

  Next, the lubricant layer 30 is formed. FIG. 2 is a schematic view showing a method for manufacturing the electric wire 1 according to the present embodiment, and shows a process for forming the lubricant layer 30. As shown in FIG. 2, first, the metal-coated fiber 10 is conveyed in the longitudinal direction and passed over the lubricant tank 40.

  In the lubricant tank 40, first and second bar members 42 and 43 extend from a bottom wall 41, and a first roller 51 and a second roller 52 are connected to these tips. The first and second rollers 51 and 52 are rotatable circular members, and the outer periphery of the circular portion is made of a cloth material or the like. The lower sides of the first and second rollers 51 and 52 are immersed in the lubricant in the lubricant tank 40.

  The metal-coated fiber 10 that is allowed to pass over the lubricant tank 40 is conveyed so as to be in contact with the upper outer periphery of the first and second rollers 51 and 52. For this reason, the first and second rollers 51 and 52 rotate, and the lubricant in the lubricant tank 40 is transferred to the top of the first and second rollers 51 and 52 and applied onto the metal-coated fibers 10. The Rukoto. Thereafter, the metal-coated fiber 10 coated with the lubricant is coated with an insulating layer by an extruder.

  As shown in FIG. 2, the metal coated fiber 10 is tensioned slightly below the second roller 52 on the transport direction side. This is to prevent the metal-coated fiber 10 from separating from the first and second rollers 51 and 52.

  FIG. 3 is a schematic view showing the method for manufacturing the electric wire 1 according to the present embodiment, and shows a process of forming the insulating layer 20. As shown in FIG. 3, the metal-coated fiber 10 to which the lubricant is applied, that is, the metal-coated fiber 10 on which the lubricant layer 30 is formed is a conductor passage 61 that is a cylindrical cavity formed in the extruder 60. It passes through the inside and is output from the front end side of the extruder 60.

  The extruder 60 has an insulator passage 62 formed therein, and a thermoplastic resin such as polyethylene or polyvinyl chloride is poured into the passage 62. The thermoplastic resin is output from the front end side of the extruder 60 on the front end side of the extruder 60, particularly on the outer peripheral side of the conductor passage 61. For this reason, at the stage where the metal-coated fiber 10 is output from the front end side of the extruder 60 through the conductor passage 61, the periphery is covered with the thermoplastic resin and the insulating layer 20 is covered.

  Here, conventionally, when the insulator is coated by the extrusion method, the metal-coated fiber 10 is passed through the die of the extruder 60, so that the metal-coated fiber 10 is in contact with the die (the tip side member of the extruder 60). There was a possibility of getting caught and breaking. However, in the present embodiment, since the extrusion method is performed in a state where the lubricant layer 30 is formed on the metal-coated fiber 10, the metal-coated fiber 10 is hardly caught on the die, and the possibility of disconnection is reduced. It will be.

  In addition, the liquid lubricant described with reference to FIG. 2 is desirably an animal and vegetable oil-based lubricant (that is, a lubricant containing fatty acids, alcohols, and esters). Since the liquid lubricants of animal and vegetable oils have an affinity for metals, there is less oil adhesion to the die than oil-based lubricants, and the adhered oil solidifies in the die and affects the insulation layer coating. This is because the possibility of being lost can be reduced. More specifically, for example, when the adhered oil is solidified at or near the insulator passage 62, the flow of the thermoplastic resin is inhibited at the solidified portion, and only the insulating layer 20 in that portion is insulated. The body thickness may be disturbed. However, this possibility can be reduced by using liquid lubricants of animal and vegetable oil systems.

  FIG. 4 is a chart showing a state of wire breakage or the like by the method for manufacturing the electric wire according to the comparative example and the method for manufacturing the electric wire 1 according to the present embodiment. As shown in FIG. 4, when the metal-coated fiber 10 formed with the metal film 12 having a thickness of 1.0 μm is passed through a die having a core metal diameter of 0.4 mm with respect to an aramid fiber (440 dtex). When the lubricant was not applied, disconnection occurred when a 1000 m electric wire was manufactured. On the other hand, when a petroleum-based lubricant (specifically paraffinic hydrocarbon) or an animal and vegetable oil-based lubricant (specifically linoleic acid) has been applied, No disconnection occurred.

  Similar results were obtained with polyarylate fibers (440 dtex). That is, when the metal film fiber 10 in which the metal film 12 having a film thickness of 1.0 μm is formed on the polyarylate fiber is extruded through a die having a core metal diameter of 0.4 mm, the lubricant is not applied. When a 1000 m electric wire was manufactured, disconnection occurred. On the other hand, when a petroleum-based lubricant (specifically paraffinic hydrocarbon) or an animal and vegetable oil-based lubricant (specifically linoleic acid) has been applied, No disconnection occurred.

  Similar results were obtained for PBO fibers (440 dtex). That is, when the metal film fiber 10 in which the metal film 12 having a film thickness of 1.0 μm is formed on the PBO fiber is extruded through a die having a core metal diameter of 0.4 mm, if a lubricant is not applied, When a 1000 m electric wire was manufactured, disconnection occurred. On the other hand, when a petroleum-based lubricant (specifically paraffinic hydrocarbon) or an animal and vegetable oil-based lubricant (specifically linoleic acid) has been applied, No disconnection occurred.

  FIG. 5 is a chart showing the concentricity of the electric wire 1 when a petroleum lubricant and an animal and vegetable oil lubricant are used. As shown in FIG. 5, when a petroleum type (paraffinic hydrocarbon) lubricant was applied as the lubricant, the concentricity was 81.4% to 86.8%, and the average was 83.5%. On the other hand, when an animal and vegetable oil system (linoleic acid) was applied as the lubricant, the concentricity was 87.7% to 94.2%, and the average was 91.4%.

  In this way, from the experimental results, when a petroleum-based lubricant is applied, the flow of the thermoplastic resin is obstructed and affects the coating of the insulating layer 20, whereas the animal and vegetable oil-based lubricant is used. When applied, it was found that the effect was small.

  Thus, according to the manufacturing method of the electric wire 1 which concerns on this embodiment, since it has the process of apply | coating a lubricant to the outer periphery of the metal-coated fiber 10 before the coating of the insulating layer 20 by the extruder 60, the metal film The fiber 10 is less likely to be caught by the die due to the lubricant applied to the outer periphery, and the possibility of disconnection of the metal-coated fiber 10 can be reduced.

  The lubricant is a liquid lubricant for animal and vegetable oil systems. Here, since the liquid lubricant of the animal and vegetable oil system has an affinity for metal, the oil adhesion to the die is less than that of the petroleum system lubricant, and the adhered oil is solidified to cover the insulating layer 20. The possibility of giving an influence can be reduced.

  Further, according to the electric wire 1 according to the present embodiment, since the lubricant layer 30 made of a lubricant is interposed between the metal-coated fiber 10 and the insulating layer 20, for example, when the electric wire 1 is bent, lubrication is performed. The friction between the metal-coated fiber 10 and the insulating layer 20 is reduced by the agent layer 30. Thereby, for example, even when the metal film 12 of the metal-coated fiber 10 is in a thin state, the metal film 12 can be made difficult to peel off due to friction. Therefore, the possibility of peeling of the metal film 12 can be reduced.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, in the electric wire 1 according to the present embodiment, the lubricant layer 30 is formed directly on the outer periphery of the metal-coated fiber 10, but the present invention is not limited thereto, and other layers may be formed between the two.

  Moreover, although the electric wire 1 which concerns on this embodiment is coat | covered with the insulating layer 20 on the one metal coating fiber 10, it does not restrict to this, A plurality of the metal coating fibers 10 are used as a strand wire, and it is on this The insulating layer 20 may be covered. Alternatively, the plurality of tensile strength fibers 11 may be collectively plated to form the metal-coated fiber 10 and the insulating layer 20 may be coated thereon.

  Further, the lubricant does not have to be a liquid lubricant, and there is no problem even if it is a lubricant such as a gel.

  Further, the lubricant application step is not limited to that shown in FIG. 2, and various methods can be employed as long as the insulating layer 20 is not covered. For example, the lubricant application process may be as shown in FIG.

  FIG. 6 is a schematic view showing a method of manufacturing the electric wire 1 according to the present embodiment, and shows a process of forming the insulating layer 20 and a process of applying a lubricant. An extruder 60 shown in FIG. 6 has a lubricant passage 63 inside the insulator passage 62. A lubricant (preferably an animal and vegetable oil-based lubricant) is poured into the passage 63, and the lubricant is applied onto the metal-coated fiber 10 in accordance with the conveyance of the metal-coated fiber 10. As described above, the lubricant application step only needs to be provided before the insulating layer 20 is coated (that is, before the moment when the metal-coated fiber 10 is coated with the insulating layer 20 at the outlet of the extruder 60). The invention is not limited to that shown in FIG.

DESCRIPTION OF SYMBOLS 1 ... Electric wire 10 ... Metal-coated fiber 11 ... Tensile fiber 12 ... Metal film 20 ... Insulating layer 30 ... Lubricant layer 40 ... Lubricant tank 41 ... Bottom wall 42 ... First rod 43 ... Second rod 51 ... 1st roller 52 ... 2nd roller 60 ... Extruder 61 ... Conductor passage 62 ... Insulator passage 63 ... Lubricant passage

Claims (2)

A method for producing an electric wire obtained by coating an insulating layer on a metal-coated fiber in which a metal film is formed on the outer periphery of a tensile strength fiber,
A method for producing an electric wire, comprising: applying a liquid lubricant of an animal and vegetable oil system to an outer periphery of the metal-coated fiber before coating an insulating layer with an extruder. A metal-coated fiber in which a metal film is formed on the outer periphery of the tensile strength fiber;
An insulating layer covering the outer periphery of the metal-coated fiber;
A lubricant layer that is interposed between the metal-coated fibers and the insulating layer and is made of a liquid lubricant of an animal and vegetable oil system ;
An electric wire comprising:

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