JP2020027678A - Cable and method for manufacturing cable - Google Patents

Abstract

To provide a cable which improves visibility of identification display and can improve workability in a cable wiring work, and a method for manufacturing the cable.SOLUTION: A cable 1 includes an insulated wire core 2 and a sheath 3. On an outer surface 6 of the sheath 3, an uneven part 9 formed so that recesses 10 and projections 11 are continuous is provided. The uneven part 9 is formed with an identification display part 12 formed by printing identification display 13. The identification display part 12 is formed by printing the identification display 13 on a phosphorescent-fluorescent coating material 14, and is formed so that the phosphorescent-fluorescent coating material 14 exists in at least the recess 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cable provided with a sheath that is coated on the outer periphery of an insulated wire core, and a method for manufacturing the cable.

  Conventionally, flat cables such as VVF (vinyl insulated vinyl sheathed cable) and EEF (polyethylene insulated heat-resistant polyethylene sheathed cable) have been generally used as power cables for indoor wiring (hereinafter, referred to as "cables"). As shown in FIG. 5, a general cable 100 has a plurality of (two in FIG. 5) insulated cores 101 formed by covering an outer periphery of a conductor 102 with an insulator 103. The outer periphery is covered with a sheath 104.

  As shown in FIG. 5, the cable 100 generally has an identification display unit 106 formed by printing an identification display (also referred to as “marking display”) 107 for identifying the cable 100 on the outer surface 105 of the sheath 104. Is formed. The identification display unit 106 is formed by printing the identification display 107 using an oil-based paint, an inkjet method, or the like. The identification mark 107 is defined by law or the like, and includes, for example, an electric appliance mark (PSE mark), a manufacturer name, a manufacturing year, a JIS certification mark, a product symbol (VV), and a sign of lead-free vinyl. .

  Since the identification display 107 is not assumed to be visually recognized in a dark place where there is no light source in the surroundings, the visibility of the identification display 107 at the time of darkening is not considered. For this reason, when wiring the cable 100 in a dark place such as an attic, the visibility of the identification mark 107 is poor, and a wiring error of the cable 100 occurs.

  Here, Patent Document 1 discloses a technique of printing a mark of a covering member of a cable with a luminous ink composed of a luminous material, and a technique of absorbing the ultraviolet light to emit the light (for example, a phosphor). ) Discloses a technique for printing with a fluorescent ink composed of: According to the technique disclosed in Patent Literature 1, the mark emits light by irradiating with luminous energy or ultraviolet light, so that the visibility of the mark in a dark place or the like is improved and the wiring of the cable is facilitated.

JP 2006-158820 A

  By the way, when the technology disclosed in Patent Document 1 is adopted for a cable for indoor wiring, that is, an identification display is printed on the outer surface of a sheath with the above-described phosphorescent ink or the above-described fluorescent ink to form an identification display portion. In this case, there are the following problems.

  That is, when the identification display is printed with the above-described light-storing ink, the identification display emits light with a luminance that enhances visibility due to the light-storing function during darkness. However, when the above-mentioned identification display is bright or when the brightness is not sufficient, it is difficult to emit light at such a luminance that visibility is good for a worker who performs cable wiring work (hereinafter referred to as “worker”). Become. Further, when the identification information is printed with the above fluorescent ink, it is premised that an ultraviolet light irradiation device for irradiating ultraviolet light is used in order to emit the identification information. Such an identification display does not emit light when there is no ultraviolet light irradiating device in any of bright, insufficient brightness, and dark.

  As described above, even when the technology disclosed in Patent Document 1 is adopted for a cable for indoor wiring, the identification display is visually recognized by the operator in any of bright, insufficient brightness, and dark. There is a problem in that it is difficult to emit light at a luminance that provides good performance. Therefore, there is a problem that the workability may be deteriorated, for example, the visibility of the identification display is poor, the cable cannot be identified, and a wiring error occurs in a cable wiring operation.

  In addition, in the technique disclosed in Patent Document 1, since the identification information is printed directly on the outer surface of the sheath, the outer surface of the sheath may be rubbed, so that the identification information may be lost. In this way, if the identification display disappears, the operator may not be able to identify the cable not only when it is dark or when the brightness is not sufficient, but also when it is bright. Therefore, also from the above point, there is a problem that workability may be deteriorated, for example, a wiring error may occur in a cable wiring operation.

  The present invention has been made in view of the above circumstances, and provides a cable capable of improving visibility of an identification display and improving workability in cable wiring work, and a method for manufacturing the cable. As an issue.

  The cable of the present invention according to claim 1, which has been made to solve the above problem, includes an insulated wire core obtained by coating a conductor with an insulator, and a sheath that is coated on the outer periphery of the insulated wire core, On the outer surface of the sheath, a concave and convex portion formed so that a concave portion and a convex portion are provided is provided, and the concave and convex portion is formed with an identification display portion printed with an identification display for identifying a cable, The identification display unit is characterized in that the identification display is printed with a phosphorescent fluorescent paint having a phosphorescent function and a fluorescent function, and is formed such that the phosphorescent fluorescent paint is present at least in the recess. .

  According to the present invention having such a feature, the identification display printed with the phosphorescent fluorescent paint absorbs the energy of light by the phosphorescent function, and then emits the stored light when it becomes dark, and is visually recognized by the worker. It emits light with high luminance so that the property is good. In addition, the above-mentioned identification display emits light with high brightness by using the energy of light by the fluorescent function so that the visibility is good for the worker by using the energy of light. In addition, when the brightness is not sufficient due to the light storing function and the fluorescent function, the identification display improves the visibility for the worker due to the light emission due to the emission of the stored light and the light emission using less light energy. It emits light with such high luminance. Therefore, the identification display emits light at a high luminance so that the visibility is good for the worker in any of bright, insufficient brightness, and dark.

  Further, according to the present invention, since the phosphorescent fluorescent paint is present at least in the recess, even if the phosphorescent fluorescent paint is originally formed of an unsuitable insulating material, regardless of the material of the sheath. The identification display can be printed with the phosphorescent paint. Further, according to the present invention, since the phosphorescent fluorescent paint is present at least in the recess, the phosphorescent paint in the recess remains even when the outer surface of the sheath is rubbed, so that the identification display is less likely to disappear. .

  Further, according to the present invention, when the outer surface of the sheath provided with the uneven portion comes into sliding contact with another surface (sliding contact surface), the frictional force generated between the uneven portion and the sliding contact surface is reduced by the conventional sheath. Is smaller than the frictional force generated between the outer surface and the sliding contact surface when the outer surface contacts the sliding contact surface. Therefore, when the cable according to the present invention is inserted into, for example, a conduit used for cable wiring, the frictional force generated between the uneven portion and the inner surface of the conduit is caused by the friction between the outer surface of the conventional sheath and the inner surface of the conduit. It is smaller than the frictional force generated between them.

  Further, according to the present invention, the outer surface of the sheath is provided with an uneven portion, so that it is as if an infinite number of cuts were formed. When inserting a blade such as an electric knife into such a sheath (cutting the blade), the blade is applied to the uneven portion and a load is applied in a direction perpendicular to the axial direction of the cable, so that the blade can be compared with a conventional sheath. Easy to put.

  The cable according to the present invention according to claim 2 is the cable according to claim 1, wherein the concave portion has the light storing portion inside the concave portion even when the phosphorescent paint on the outer surface side of the identification display portion has disappeared. It is characterized in that it is formed so as to have a depth at which the fluorescent paint can exist.

  According to the present invention having such features, the concave portion has a depth at which the phosphorescent fluorescent paint can exist in the concave portion even when the phosphorescent fluorescent paint on the outer surface side of the identification display portion has disappeared. Even if the sheath is formed of an insulating material that is not originally suitable for the phosphorescent paint or the outer surface of the sheath is rubbed and the phosphorescent paint on the outer surface side of the identification display part disappears, the phosphorescent paint in the recess remains. Easier to do. By forming the concave portion at the above-described depth, the identification display becomes more difficult to disappear. Therefore, the identification mark can be easily printed with the phosphorescent paint regardless of the material of the sheath, and the identification mark can be visually recognized even if the outer surface of the sheath is rubbed and the phosphorescent paint on the outer surface side of the identification display portion disappears. It is possible to emit light with a high luminance so that the property is good.

  A cable according to a third aspect of the present invention is the cable according to the first or second aspect, wherein the uneven portion is formed along a longitudinal direction of the cable.

  According to the present invention having such a feature, since the uneven portion is formed along the longitudinal direction of the cable, the identification for identifying the cable is displayed in the longitudinal direction of the cable as in the conventional cable. Can be displayed along.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a cable according to the fourth aspect of the present invention, comprising the steps of: coating a sheath around an outer periphery of an insulated wire obtained by coating a conductor with an insulator; Forming a concave and convex portion such that the concave portion and the convex portion are continuous, and forming an identification display portion by printing an identification display for identifying a cable on the concave and convex portion, forming the identification display portion The step of printing is characterized in that the identification display is printed with a phosphorescent phosphor paint having a phosphorescent function and a fluorescent function, and the phosphorescent paint is formed so as to be present at least in the recess.

  According to the present invention having such a feature, the identification display printed with the phosphorescent fluorescent paint absorbs the energy of light by the phosphorescent function, and then emits the stored light when it becomes dark, and is visually recognized by the worker. It emits light with high luminance so that the property is good. In addition, the above-mentioned identification display emits light with high brightness by using the energy of light by the fluorescent function so that the visibility is good for the worker by using the energy of light. In addition, when the brightness is not sufficient due to the light storing function and the fluorescent function, the identification display improves the visibility for the worker due to the light emission due to the emission of the stored light and the light emission using less light energy. It emits light with such high luminance. Therefore, the identification display emits light at a high luminance so that the visibility is good for the worker in any of bright, insufficient brightness, and dark.

  Further, according to the present invention, since the phosphorescent fluorescent paint is present at least in the recess, even if the phosphorescent fluorescent paint is originally formed of an unsuitable insulating material, regardless of the material of the sheath. The identification display can be printed with the phosphorescent paint. Further, according to the present invention, since the phosphorescent fluorescent paint is present at least in the recess, the phosphorescent paint in the recess remains even when the outer surface of the sheath is rubbed, so that the identification display is less likely to disappear. .

  According to the present invention, the identification display can emit light with a brightness that provides good visibility when it is dark or the brightness is insufficient, so that the visibility of the identification display is improved and the wiring of the cable is improved. There is an effect that workability in work can be improved.

It is a figure which shows the Example of the cable which concerns on this invention, and is a perspective view of the cable in a bright situation (when it is bright) where there is a light source around. It is a figure which shows the Example of the cable which concerns on this invention, and is a perspective view of the cable in the situation where surrounding brightness is not enough (when brightness is not enough). It is a figure which shows the Example of the cable which concerns on this invention, and is a perspective view of the cable in the dark situation (when it is dark) where there is no light source in the periphery. It is sectional drawing of the uneven part in the outer surface of a sheath. It is a perspective view of the cable of the prior art example.

  Hereinafter, an embodiment of a cable according to the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing an embodiment of a cable according to the present invention, and is a perspective view of the cable in a bright situation (when bright) where there is a light source in the surroundings. FIG. 2 shows an embodiment of the cable according to the present invention. FIG. 3 is a perspective view of the cable in a situation where the surrounding brightness is not sufficient (when the brightness is not sufficient). FIG. 3 is a diagram showing an embodiment of the cable according to the present invention, and there is no light source in the surroundings. FIG. 4 is a perspective view of the cable in such a dark state (when it is dark), and FIG. 4 is a cross-sectional view of an uneven portion on the outer surface of the sheath.

  1 to 3, reference numeral 1 indicates a cable of the present invention. The cable 1 illustrated in FIGS. 1 to 3 is a so-called flat cable. In the present embodiment, a plurality of (two in this embodiment) insulated wires 2 and a sheath 3 are arranged in parallel. It is provided with. In this embodiment, two insulated cores 2 are provided, but the invention is not limited to this. In addition, although not particularly shown, it may be configured to include one insulated wire core 2. Although not particularly shown, it may be configured to include three or more insulated wires 2. Hereinafter, each configuration of the cable 1 of the present invention will be described.

First, the insulated wire core 2 will be described.
The insulated wire core 2 illustrated in FIGS. 1 to 3 includes a conductor 4 and an insulator 5 formed with a predetermined thickness by extruding a resin material on the outer periphery of the conductor 4. Examples of the resin material include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-α-olefin copolymer. Coalescence, ethylene propylene copolymer and the like.

Next, the sheath 3 will be described.
The sheath 3 illustrated in FIG. 1 is formed with a predetermined thickness by arranging two insulated wires 2 in parallel and extruding a resin material on the outer periphery of the insulated wire 2. As the resin material, similarly to the insulator 4, polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), Examples include an ethylene-α-olefin copolymer and an ethylene-propylene copolymer.

  The outer surface 6 of the sheath 3 is formed such that the cross section when the cable 1 is cut in a direction orthogonal to the longitudinal direction (axial direction of the cable 1) is an oval. As illustrated in FIGS. 1 to 3, the outer surface 6 of the sheath 3 includes a pair of flat portions 7 formed in a plane and a pair of curved portions 8 formed in a curved shape. As shown in FIGS. 1 to 3, the pair of flat portions 7 is formed so as to be arranged at a position orthogonal to the direction in which the two insulated wires 2 are arranged. As shown in FIGS. 1 to 3, the pair of curved surface portions 8 are formed so as to be arranged at positions in a direction in which the two insulated wire cores 2 are arranged.

  As shown in FIGS. 1 to 4, an uneven portion 9 is provided on one of the pair of flat portions 7. As shown in FIGS. 1 to 3, the uneven portion 9 is formed in a band shape along the longitudinal direction of the cable 1 immediately above the two insulated wire cores 2 in the flat portion 7. As shown in FIGS. 1 to 3, in the present embodiment, the uneven portion 9 is formed continuously along the longitudinal direction of the cable 1 (this is merely an example. The uneven portion 9 may be formed intermittently along the longitudinal direction of the cable 1).

  As shown in FIGS. 1 to 3, the uneven portion 9 is formed by making a fine slit in the plane portion 7. As shown in FIG. 4, the uneven portion 9 is formed such that the concave portion 10 and the convex portion 11 are continuous in the longitudinal direction of the cable 1. According to such an uneven portion 9, an identification display portion 12 (identification display 13) described later can be displayed along the longitudinal direction of the cable 1 like the conventional cable 100 (see FIG. 5). Become.

  The uneven portion 9 has a frictional force generated between the uneven portion 9 and another surface not shown (hereinafter referred to as a “sliding surface”) due to the outer surface of the smooth sheath having no uneven portion 9 (for example, FIG. It is formed so as to be smaller than the frictional force generated between the outer surface 105) of the illustrated sheath 104 and the sliding contact surface. According to such an uneven portion 9, the outer surface 6 (the flat portion 7) of the sheath 3 provided with the uneven portion 9 is formed between the uneven portion 9 and the sliding contact surface when the outer surface 6 (the flat surface portion 7) slides on the sliding contact surface. The frictional force can be made smaller than the frictional force generated between the outer surface 105 and the sliding contact surface when the outer surface 105 of the conventional sheath 104 slides on the sliding contact surface.

  In addition, the uneven portion 9 is provided so that the outer surface 6 (the flat portion 7) of the sheath 3 is in a state where countless cuts are formed. The concave-convex portions 9 are formed so that when cutting the sheath 3, the cutting can be performed more easily than a conventional sheath (for example, the sheath 104 illustrated in FIG. 5). Here, the above-mentioned “inserting a blade” refers to inserting a blade such as an electric knife into the sheath 3.

  As shown in FIG. 4, the light-storing fluorescent paint 14 is present in the recess 10 even when the depth of the light-storing fluorescent paint 14 on the outer surface side of the identification display unit 12 described later has disappeared. It is formed so as to have a possible depth. Here, the “depth” of the concave portion 10 is a distance from the position of the top portion 15 of the convex portion 11 shown in FIG. 4 (the position of the imaginary line X shown in FIG. 4) to the position of the bottom portion 16 of the concave portion 10. Shall be referred to. It should be noted that the “outside of the identification display section” may be appropriately read as “outside the identification display section”.

  According to the recess 10, the phosphorescent paint 14 remains in the recess 10 even when the phosphorescent paint 14 on the outer surface side of the identification display unit 12 disappears. Here, “the case where the phosphorescent phosphor paint 14 on the outer surface side of the identification display unit 12 has disappeared” refers to the following case. That is, for example, when the identification display section 12 was formed, the identification display section 12 was located at the position of the imaginary line X shown in FIG. It is assumed that the phosphorescent phosphor paint 14 on the outer surface side of the part 12 has disappeared.

  As shown in FIGS. 1 to 4, an identification display section 12 is formed on the uneven portion 9. As shown in FIGS. 1 to 3, the identification display section 12 is formed by printing an identification display 13 for identifying a cable. The identification display 13 is also called “marking display” and is displayed by characters, graphics, symbols, and the like. The identification mark 13 is defined by law or the like, and includes, for example, an electric appliance mark (PSE mark), a manufacturer name, a manufacturing year, a JIS certification mark, a product symbol (VV), a mark of lead-free vinyl, and the like. Have been.

  The identification display section 12 is formed by printing the identification display 13 with the phosphorescent paint 14. As shown in FIG. 4, the identification display section 12 (the identification display 13) is formed such that the phosphorescent paint 14 exists at least in the recess 10.

  The phosphorescent paint 14 is a paint having a phosphorescent function and a fluorescent function. In the present embodiment, for example, a product name “LUMIALPHACOAT (registered trademark)” manufactured by Alpha Paint Co., Ltd. is used as the light-storing fluorescent paint 14 having both light-storing and fluorescent characteristics used for the identification display 13. The above-described phosphorescent fluorescent paint 14 satisfies the test based on JIS Z 9107: 2008.

  Here, the test based on JIS Z 9107: 2008 is performed by the following method. First, the sample (here, the sample coated with the above-described phosphorescent fluorescent paint 14) is stored in a dark place for 48 hours or more with external light blocked. Thereafter, the sample surface having a predetermined measurement area is irradiated with an illuminance of 200 lx for 20 minutes using the common light source D65. After removing the irradiation, the luminance is measured after 2 minutes, 10 minutes, 30 minutes, and 60 minutes. Thus, the above test is completed.

  The above-described phosphorescent fluorescent paint 14 is capable of absorbing the energy of light such as sunlight and fluorescent light, and emitting the stored light when darkened to emit light. After the energy of the light is absorbed by the identification display 13 printed with the phosphorescent paint 14, the identification display 13 emits light with high luminance when it becomes dark. The phosphorescent phosphor paint 14 exemplified above can emit a clear color by the energy of light when the brightness is not sufficient. The identification display 13 printed with such a phosphorescent paint 14 emits light with high brightness using a small amount of light energy when the brightness is not sufficient.

  In addition, since the phosphorescent phosphor paint 14 exemplified above is a water-based paint, there is no possibility of adversely affecting the environment. Thus, the phosphorescent paint 14 is environmentally friendly.

  By the way, a water-based paint such as the phosphorescent paint 14 is originally not suitable for polyethylene or polypropylene. For this reason, when polyethylene or the like is selected as the resin material forming the sheath 3, it is conventionally difficult to print the identification 13 on the outer surface 6 of the sheath 3 using the above-described phosphorescent paint 14. . Here, in the present embodiment, since the phosphorescent fluorescent paint 14 is present at least in the concave portion 10, even when the sheath 3 is formed of polyethylene or the like, the identification mark 13 is displayed by the above-described phosphorescent fluorescent paint 14. Can be printed.

Next, a method for manufacturing the cable 1 of the present invention will be described.
First, in a first step (insulated wire core manufacturing process), the insulated wire core 2 is manufactured. The manufacture of the insulated wire core 2 is performed by extrusion molding. That is, the insulator 5 is formed with a predetermined thickness by extruding a resin material on the outer periphery of the conductor 4.

  Next, in a second step (sheath forming step), the sheath 3 is formed and the cable 1 is manufactured. First, two insulated wires 2 are arranged in parallel. Thereafter, the sheath 3 is formed with a predetermined thickness by extruding a resin material on the outer periphery of the two insulated wire cores 2.

  Next, in a third step (an uneven part forming step), an uneven part 9 is formed on the outer surface 6 of the sheath 3. The formation of the uneven portion 9 is performed by using an uneven portion forming means (an uneven portion forming device) (not shown). Although not shown, the uneven portion forming means is provided with an uneven portion forming roll. The concavo-convex portion forming roll is obtained by applying a known roll used in the production of a general cable, and has a fine slit formed on the outer peripheral surface. The uneven portion 9 is formed by passing the cable 1 manufactured in the second step through an uneven portion forming roll.

  Next, in a fourth step (identification display section forming step), the identification display section 12 is formed. The identification display section 12 is formed by printing an identification display 13 on the uneven portion 9. In the fourth step, the identification mark 13 is printed with the phosphorescent paint 14 described above. In the fourth step, the identification display section 12 (identification display 13) is formed such that the phosphorescent paint 14 is present at least in the concave portion 10. Thus, the manufacture of the cable 1 of the present invention is completed.

  Next, using the cable 1 of the present invention, a bright situation where there is a light source in the surroundings (when bright), a situation where the surrounding brightness is not enough (when the brightness is not enough), and no surrounding light source The operation of the cable 1 of the present invention when performing wiring work in such dark situations (when dark) will be described.

  As shown in FIG. 1, when the wiring work of the cable 1 is performed in a bright situation where the light source is in the surroundings (when it is bright), the identification display 13 of the identification display section 12 emits light as follows. That is, the identification display 13 emits light using the energy of light by the fluorescent function with high brightness so that the worker who performs the wiring work (hereinafter, referred to as “worker”) has good visibility. In FIG. 1, the identification 13 is shown in white, but actually emits yellow light.

  As shown in FIG. 2, when wiring the cable 1 in a situation where the surrounding brightness is not sufficient (when the brightness is not sufficient), the identification display 13 of the identification display unit 12 emits light as follows. . In other words, the identification display 13 emits the stored light by absorbing the light energy in advance by the light storing function, and emits the light using a small amount of light energy by the fluorescent function, so that the visibility is visible to the worker. Light is emitted at such a high luminance that the light emission becomes good. In FIG. 2, the identification display 13 is shown in gray, but actually emits light in a color (yellow-green) that is a mixture of yellow and green.

  As shown in FIG. 3, when the wiring work of the cable 1 is performed in a dark situation (when it is dark) where there is no light source around, the identification display 13 of the identification display unit 12 emits light as follows. In other words, the identification display 13 absorbs light energy in advance by the light storing function, and then emits the stored light when it becomes dark, and emits light with high brightness so that the visibility is good for the worker. Although the identification display 13 is shown in black in FIG. 3, it actually emits green light.

  As described above, the identification display 13 emits light at a high luminance so that the visibility is good for the worker in any of a bright state, an insufficient brightness state, and a dark state. Therefore, according to the present invention, the visibility of the identification display 13 is improved for the worker even when the brightness is not sufficient or when the brightness is low, so that the visibility equivalent to the normal brightness can be ensured, and Wiring mistakes in the wiring work are less likely to occur.

Next, an operation of the present invention for preventing the identification display unit 12 from disappearing will be described.
As described above, the water-based paint such as the phosphorescent paint 14 is originally not suitable for polyethylene or the like. Here, according to the present invention, as shown in FIG. 4, since the identification phosphor 12 is formed so that the phosphorescent paint 14 exists at least in the recess 10, the sheath 3 is made of polyethylene or the like. Even if it is formed, the identification mark 13 can be printed with the phosphorescent paint 14. Therefore, even when a material (for example, polyethylene or the like) that is not suitable for the water-based paint is used as the insulating material of the sheath 3, the identification mark 13 can be printed with the phosphorescent paint 14, and the phosphorescent paint 14 is at least , It is possible to prevent the identification display unit 12 from disappearing.

  Further, according to the present invention, as shown in FIG. 4, since the phosphorescent fluorescent paint 14 is present at least in the recess 10, even if the outer surface 6 of the sheath 3 is rubbed, the phosphorescent phosphor in the recess 10 is rubbed. Since the paint 14 remains, it is possible to prevent the identification display section 12 from disappearing.

  Further, according to the present invention, the recess 10 has a depth that allows the phosphorescent paint 14 to exist in the recess 10 even when the phosphorescent paint 14 on the outer surface side of the identification display unit 12 disappears. The following operations are provided. That is, when the sheath 3 is formed of an insulating material (for example, polyethylene or the like) which is originally not suitable for the phosphorescent fluorescent paint 14, or the outer surface 6 of the sheath 3 is rubbed and the outer surface of the identification display portion 12 (shown in FIG. 4). Even when the phosphorescent fluorescent paint 14 on the virtual line X) side disappears, the phosphorescent fluorescent paint 14 in the recess 10 tends to remain. As described above, by forming the concave portion 10 at the above-described depth, the identification display portion 12 becomes more difficult to disappear. Therefore, regardless of the material of the sheath 3, the identification mark 13 can be easily printed with the phosphorescent paint 14, and the phosphorescent paint 14 on the outer surface side of the identification display portion 12 disappears due to the rubbing of the outer surface 6 of the sheath 3. Even if there is, it is possible to cause the identification display 13 to emit light with high luminance so that the visibility is good.

Next, an operation when the cable 1 of the present invention is inserted into a pipeline will be described.
When the cable 1 shown in FIGS. 1 to 3 is inserted into a conduit (not shown) used for cable wiring (hereinafter, referred to as a conduit), the outer surface 6 of the sheath 3 comes into sliding contact with the inner surface of the conduit. When the outer surface 6 of the sheath 3 slides on the inner surface of the conduit, a frictional force is generated between the outer surface 6 and the inner surface of the conduit. Here, the uneven portion 9 has a frictional force generated between the uneven portion 9 and the sliding contact surface, and the outer surface of the smooth sheath having no uneven portion 9 (for example, the outer surface 105 of the sheath 104 shown in FIG. 5). Since it is formed so as to be smaller than the frictional force generated between the sliding contact surface, the following operation is provided. That is, according to the cable 1, when the outer surface 6 (the flat portion 7) of the sheath 3 provided with the uneven portion 9 slides on the sliding contact surface (here, the inner surface of the pipeline), the uneven portion 9 and the pipeline Can be made smaller than the frictional force generated between the outer surface 105 of the conventional sheath 104 and the inner surface of the conduit shown in FIG.

Next, the operation when cutting the sheath 3 of the cable 1 of the present invention will be described.
The cutting is performed, for example, by inserting a blade such as an electric knife into the sheath 3 for terminal treatment of the cable 1. When cutting the cable 3 into the sheath 3, first, a cutting edge such as an electric knife or the like (not shown) is applied to the uneven portion 9. Thereafter, a load (cutting load) is applied in a direction orthogonal to the axial direction of the cable 1 (in FIGS. 1 to 3, a direction in which the cable 1 comes out from the front surface to the back surface). According to the cable 1, the cutting edge can be more easily cut than the conventional sheath 104 shown in FIG.

Next, effects of the cable 1 of the present invention will be described.
As described above with reference to FIGS. 1 to 4, according to the cable 1 of the present invention, the identification display 13 has such a luminance that the visibility becomes good when it is dark or when the brightness is not enough. , The visibility of the identification 13 can be improved, and the workability in the wiring work of the cable 1 can be improved.

According to the cable 1 of the present invention, the following effects can be obtained in addition to the above effects.
That is, according to the cable 1 of the present invention, when the cable 1 is inserted into the cable wiring conduit, the uneven portion 9 and the inner surface of the conduit when the outer surface 6 of the sheath 3 slides on the inner surface of the conduit. Can be made smaller than the conventional frictional force generated between the outer surface 105 of the sheath 104 and the inner surface of the conduit, so that the cable 1 can be more easily inserted into the conduit. It has the effect of being able to. Further, according to the cable 1 of the present invention, since the above-described pierceability can be improved, there is an effect that operability in the work of inserting the cable 1 into a pipeline can be improved.

  Further, according to the cable 1 of the present invention, when cutting the sheath 3, the cutting edge is inserted by applying a cutting edge load such as an electric knife to the concave-convex portion 9 as compared with the conventional sheath 104. Therefore, there is an effect that the workability of the cable 1 can be improved.

  In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the gist of the present invention.

  In the above description, the cable 1 of the present invention is used as a power cable for indoor wiring, but is not limited to this. In addition, for example, it can be used in a place where brightness cannot be sufficiently secured, such as a construction site.

  Further, the cable 1 of the present invention can be applied to a 600 V-CVT cable, a 6600 V-CVT cable, and the like.

  DESCRIPTION OF SYMBOLS 1 ... Cable, 2 ... Insulated wire core, 3 ... Sheath, 4 ... Conductor, 5 ... Insulator, 6 ... Outer surface, 7 ... Flat surface part, 8 ... Curved surface part, 9 ... Uneven part, 10 ... Concave part, 11 ... Convex part Reference numeral 12: identification display portion, 13: identification display, 14: phosphorescent paint, 15: top, 16: bottom

Claims (4)

An insulated wire core formed by coating a conductor with an insulator;
A sheath covering the outer periphery of the insulated wire core;
With
On the outer surface of the sheath,
An uneven portion formed so that the concave portion and the convex portion are continuous is provided,
In the uneven portion,
An identification display portion formed by printing an identification display for identifying the cable is formed,
The identification display unit includes:
A cable comprising the phosphorescent paint having a phosphorescent function and a fluorescent function, wherein the identification mark is printed and the phosphorescent paint is formed at least in the recess. The cable according to claim 1,
The recess is
A cable formed so as to have a depth at which the phosphorescent fluorescent paint can exist in the recess even when the phosphorescent fluorescent paint on the outer surface side of the identification display unit has disappeared. The cable according to claim 1 or 2,
The uneven portion,
A cable formed along the longitudinal direction of the cable. A step of coating the outer periphery of an insulated wire core formed by coating the conductor with an insulator,
Forming a concave and convex portion such that the concave portion and the convex portion are continuous on the outer surface of the sheath,
A step of printing an identification display for identifying the cable on the uneven portion to form an identification display portion,
Including
In the step of forming the identification display portion,
A method for manufacturing a cable, comprising: printing the identification mark with a phosphorescent phosphor paint having a phosphorescent function and a fluorescent function; and forming the phosphorescent paint at least in the recess.

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