JPH0621118U - Insulated wire and coaxial cable - Google Patents

Abstract

(57) [Abstract] [Purpose] Polyether ether ketone resin (PEEK)
Can be used for the insulation coating process only once, and has high mechanical strength, external damage resistance, cut-through resistance, abrasion resistance, heat aging resistance, low temperature resistance, heat resistance, chemical resistance. Provided are an insulated wire and a coaxial cable which have characteristics such as radiation resistance, flame retardancy, low smoke generation, light weight, low dielectric constant, flexibility, and good workability. [Structure] A tape material obtained by laminating a porous tetrafluoroethylene resin film 2a and a polyetheretherketone resin film 3a is spirally or tubularly formed so that a part of the tape material is overlapped around a conductor 4a. The insulated electric wire 1a is formed by winding the tape material and the overlapping tape materials so as to be melted and integrated. Also, this insulated wire 1a
Includes coaxial cable with core.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides an insulated wire using a coating layer made of a porous tetrafluoroethylene resin (hereinafter referred to as EPTFE) and a polyetheretherketone resin (hereinafter referred to as PEEK), and the insulated wire as a core. Regarding the coaxial cable.

[0002]

[Prior art]

 PEEK has high mechanical strength, is excellent in external damage resistance, abrasion resistance, heat aging resistance, low temperature resistance, heat resistance, chemical resistance, radiation resistance, flame resistance, light weight, etc. It is used for insulation wire insulation because it has characteristics such as less smoke and generation of harmful gas. Further, conventionally, as described in, for example, Japanese Utility Model Laid-Open No. 58-37617, Japanese Utility Model Laid-Open No. 63-182410, and Japanese Patent Laid-Open No. 2-27611, a heat-resistant organic resin layer is provided around the conductor. An insulated electric wire having two or more layers of insulation coating has been proposed, which is obtained by subjecting this PEEK to extrusion coating on it. This is because even if the PEEK coating layer is cracked or cracked due to bending or the like, the heat-resistant organic resin layer can ensure the insulating property and the dielectric breakdown is prevented under a high voltage.

[0003]

[Problems to be solved by the device]

 However, the insulated wires coated with these PEEKs have the following problems (a) to (d). (a) These insulated wires have a problem that the manufacturing cost is increased because the insulation coating step of inside and outside is required twice or more. (b) The above-mentioned heat-resistant organic resin layer is a solid resin, and is not preferable in terms of weight when, for example, electric wires and cables for aircraft are pursued to be lightweight. (c) Since the outer PEEK layer is provided by melt-extrusion molding of PEEK, which is difficult to reduce the wall thickness, the insulated wire having the relatively thick PEEK layer must be hard. Therefore, these insulated wires have poor workability and workability. (d) When such an insulated wire is used for the core of a coaxial cable, it is difficult to significantly reduce the propagation delay time of the coaxial cable because the heat-resistant organic resin layer is a solid resin. Therefore, due to the high price of PEEK, it is only used in small amounts for special purposes.

In view of the above-mentioned conventional technique, the present invention can complete the insulating coating process at one time even if PEEK is used, and has characteristics such as light weight, flexibility, good workability, and low dielectric constant. It is an object of the present invention to provide an insulated electric wire and a coaxial cable having both of the above. The coaxial cable also includes a semi-rigid cable.

[0005]

[Means for Solving the Problems]

 The present invention has been made to achieve the above-mentioned object. In this insulated wire, a tape material obtained by laminating an EPT FE film and a PEEK film is formed so that a part of the tape material is overlapped around a conductor. It is characterized in that the tape material is wound in a spiral shape or a cylindrical shape, and the overlapping tape materials are melted and integrated. Further, in a coaxial cable, a tape material obtained by laminating an EPTFE film and a PEEK film is wound around a conductor in a spiral shape or a tubular shape so that a part of the tape material overlaps, and between the overlapping tape materials. It is characterized by comprising a core made of an insulated electric wire formed by melting and integrating the above, an outer conductor provided on the outer circumference of the core, and a jacket provided on the outer circumference of the outer conductor.

[0006]

[Action]

 In the insulated wire according to the present invention, a tape material in which an EPTFE film and a PEEK film are laminated around a conductor is wound in a spiral shape or a tubular shape so that a part of the tape material overlaps, and the wound material is wound. Since it can be obtained by heating and melting and integrating the PEE K film between the overlapping tape materials, the insulating coating process can be performed only once, the productivity is significantly improved, and the manufacturing cost is significantly reduced.

Further, the tape material for this insulated wire is light because the EPTFE film has a porous portion, and PEEK as a reinforcing layer of this EPTFE is formed into a film, so that the weight of the insulated wire is reduced. It is extremely lightweight, which makes it suitable for electric wires and cables for aircraft, for example.

Further, since the EPTFE film has continuous pores, the PEEK film heated and melted in the pores partially penetrates and solidifies to generate an anchor effect, so that the overlapping tape materials are firmly integrated. In addition, the PEEK layer of this insulated wire is a thin film, and a flexible EPTFE film is provided between the PEEK layer and the PEEK layer, resulting in excellent flexibility and good processability.

Further, in the coaxial cable having the insulated electric wire as a core, the relative permittivity of the EPTFE film and the PEEK film can be 1.3 to 10 by appropriately selecting the physical properties and thickness of one or both of the EPTFE film and the PEEK film. It can be adjusted up to 2.1 as desired. Moreover, even when such an insulating coating layer having a low dielectric constant is compressed by, for example, an outer conductor provided around the insulating coating layer, the PEEK film portion having high mechanical strength exerts a protective function. Also, the porous portion of the insulating coating layer is prevented from being destroyed, and as a result, the relative dielectric constant is prevented from increasing. This makes it possible to obtain a coaxial cable with an insulating coating (dielectric) layer that retains a low dielectric constant, which results in more stable transmission characteristics than, for example, a conventional coaxial cable using only EPTFE as a dielectric. Be converted.

Since the PE EK film is preferably present in the outermost layer or the intermediate layer of the insulating coating layer of this insulated wire, it has high mechanical strength, external damage resistance, cut-through resistance, and abrasion resistance characteristics. It has characteristics of heat aging resistance, low temperature resistance, heat resistance, chemical resistance, flame retardancy, and low smoke generation.

[0011]

【Example】

 An embodiment of the insulated wire and the coaxial cable according to the present invention will be described below with reference to the drawings. First, FIG. 1 is a cross-sectional view showing an embodiment of an insulated wire according to the present invention. Here, to explain with reference to FIG. 1, the insulated wire 1a is formed by extending from the front to the back toward the drawing, and the tape material in which the EPTFE film 2a and the PEEK film 3a are laminated is used for the conductor 4a. The insulating coating layer is formed by spirally or cylindrically winding so that a part of the PEEK film 3a is heated and melted to form an insulating coating layer. In this insulated wire 1a, since the PEEK film 3a is the outermost layer, it exhibits high mechanical strength, external damage resistance, cut-through resistance, and abrasion resistance. Further, even if an external force is applied to this insulated wire, the PEEK film 3a protects the insulating coating layer, so that the porous pores of the EPTFE film 2a are maintained without being crushed, and the dielectric property of this wound insulating coating layer is maintained. It is possible to prevent an increase in the dielectric constant, maintain a low dielectric constant, and stabilize the transmission characteristics.

As the insulated wire 1a, for example, an EPTFE film 2a with a thickness of 80 μm having continuous pores and a PEEK film 3a with a thickness of 7 μm, the dielectric constant of which is made low by a method such as a stretching treatment, is used. Further, in this insulated wire, the EPTFE film 2a is integrated by being heated and melted at a temperature higher than the melting point (334 ° C) of the PEEK film 3a within a time period in which the EPTFE film 2a does not shrink or slightly shrinks. The body is formed. In this insulated wire 1a, the EPTFE film 2a and the PE EK film 3a are not integrated before being wound around the conductor 4a. Further, the number of PEEK films 3a may be two or more. As the tape material, a laminated tape material obtained by laminating a PEEK film 3a on one surface of the EPTFE film 2a, heating and melting and integrating the laminated tape material is wound around the conductor 4a in a spiral or tubular shape. The insulated wire 1a can also be manufactured by heating and melting and integrating the overlapping tape materials.

FIG. 2 is a cross-sectional view showing another embodiment of the insulated wire according to the present invention. The insulated wire 1b is formed by extending from the front to the back in the figure, and a tape material obtained by laminating an EPTFE film 2b and a PEEK film 3b is formed around the conductor 4b so that a part of the tape overlaps. Thus, the PEEK film 3b is heated and melted at the overlapping portion to form an insulating coating layer. In this insulated wire 1b, the PEEK film 3b in the intermediate layer of the insulation coating layer protects the EPTFE film 2b inside the PEEK film 3b, and the EPTFE film 2b in the outermost layer has a cushioning property. The use of a laminating tape material and the number of PEEK films 3b of 2 or more can be performed in the same manner as in the above-described embodiment.

FIG. 3 is a cross-sectional view showing an embodiment of the coaxial cable according to the present invention. Referring to FIG. 3, the coaxial cable 5 uses the insulated wire 1a described in FIG. 1 as the core 6. That is, the core 6 is formed by winding a tape material obtained by laminating the EPTFE film 2a and the PEEK film 3a in a spiral shape or a cylindrical shape around the conductor 4a so as to partially overlap each other to form an overlapping portion. The PEEK film 3a in the overlapping portion is melted by heating and integrated to form an insulating coating layer (dielectric layer). An outer conductor layer 7 is provided around the core 6, and a jacket layer 8 is provided around the outer conductor layer 7 if necessary. The outer conductor layer 7 is, for example, a braided or horizontally wound conductive linear body such as metal, or a conductive foil-shaped body spirally or cylindrically wound, or a conductive tubular body. The body is used. The propagation delay time Tr of the coaxial cable 5 was measured to be 3.84 nanoseconds / m, and the transmission characteristics were stable. Further, when calculated from the value of the propagation delay time Tr, the relative permittivity εr of this insulating coating, that is, the dielectric was 1.33. Further, in this coaxial cable 5, a coaxial cable (not shown) using the insulated electric wire 1b as a core can also be used.

The present invention is not limited to the above-described embodiment, and the insulation coating layer of the insulated wire and the coaxial cable may be, for example, an EPTFE film or a PE EK film having a thickness different from the above, and a winding direction. It is possible to make various changes within the technical concept of the present invention, such as reversing the number, increasing or decreasing the number of windings, and winding a tape material in which a plurality of sets of E PTFE film and PEEK film are alternately laminated. Is.

[0016]

[Effect of device]

 As described above, according to the present invention, even when PEEK is used, the insulating coating process of the insulated wire is performed only once, so that the productivity is significantly improved and the manufacturing cost is significantly reduced. In addition, this insulated wire has high mechanical strength, external damage resistance, cut-through resistance, abrasion resistance, heat aging resistance, low temperature resistance, heat resistance, chemical resistance, radiation resistance, flame resistance, and low smoke generation. It has excellent characteristics such as flexibility, lightness, flexibility and good workability. In addition, in a coaxial cable using this insulated wire as a core, the PEEK film can stably maintain the low dielectric constant of the insulating coating (dielectric) layer, so that the signal propagation delay is longer than that of the conventional coaxial cable. Time can be shortened and stable transmission characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an insulated wire according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the insulated wire according to the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of a coaxial cable according to the present invention.

[Explanation of symbols]

1a, 1b Insulated wire 2a, 2b Porous tetrafluoroethylene resin (EPTF
E) Film 3a, 3b Polyether ether ketone resin (PE
EK) film 4a, 4b conductor 5 coaxial cable 6 core 7 outer conductor layer 8 jacket layer

Claims (2)

[Scope of utility model registration request] 1. A tape material obtained by laminating a porous tetrafluoroethylene resin film and a polyetheretherketone resin film in a spiral shape or a cylindrical shape so that a part of the tape material overlaps around a conductor. An insulated electric wire formed by winding and melting and integrating the overlapping tape materials. 2. A tape material obtained by laminating a porous tetrafluoroethylene resin film and a polyetheretherketone resin film in a spiral shape or a cylindrical shape so that a part of the tape material is overlapped around a conductor. A coaxial line comprising a core formed of an insulated electric wire formed by winding and melting and melting the overlapping tape materials, an outer conductor provided on the outer periphery of the core, and a jacket provided on the outer periphery of the outer conductor. cable.