JPS6017807A - Marking cable and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marker type cable that does not easily peel off to the surface of the cable jacket and does not increase the effective outer diameter of the cable, and a method for manufacturing the same.

Multiple cables f: When laying or spanning cables at one location, it may be necessary to distinguish a particular cable from other cable groups, but the method used for this purpose is not shown in the figure. It is conceivable to provide a cable sheath of a different color from the sheaths of other general cables on the cable core.

However, the cable jacket needs to withstand the effects of outside air, sunlight, and ultraviolet rays, and has considerable mechanical strength. Normally, weather-resistant carbon black is mixed into the plastic used for the cable jacket and then extruded for coating. Although there are some differences depending on the type of the same compound, it is far more susceptible to deterioration than a plastic jacket containing weather-resistant carbon black, which inevitably shortens the cable's lifespan.

In this case, as shown in Fig. 1, the cable core 1 is covered with a plastic sheath 2 mixed with weather-resistant carbon black, and then a plastic sheath 2 mixed with weather-resistant carbon black is coated on top of the cable core 1. A cable with a sheath 3 is considered, but due to manufacturing issues, there is a limit to the minimum thickness of the plastic sheath 3, and a thicker sheath than is necessary for identification purposes is required. Become. For this reason, with such a cable, the outer diameter of the cable increases, the weight of the cable increases, and the cost of the cable also increases.It is not desirable to handle the cable as it requires additional labor. .

In addition, the outer diameter of the cable and the thickness of the plastic outer sheath 2 mixed with weather-resistant carbon black should be 1 if the thickness of the plastic jacket 2 mixed with weather-resistant carbon black is the same as that of a regular cable. As the thickness of the plastic sheath 3 becomes thinner, the originally required characteristics of the plastic sheath 2 are no longer affected by light, and the plastic sheath 3 forming the outermost layer also ages quickly. Therefore, not only the cable identification ability is lost, but also the total protection ability of the cable sheath is reduced, which inevitably shortens the usable life of the cable itself.

Further, the problem of the type and thickness of the outer covering is as mentioned above, but in terms of production, extrusion twice increases the number of man-hours, but multi-layer extrusion requires special equipment, so it is not advantageous.

Next, as a simple identification means free from such defects, as shown in FIG. When making a cable with 4 strips Δ~□2I to create a poetic effect by extruding the cable jacket including the ridges, it is necessary to prepare a special die, and the ridges are also black. Because it contains weather resistant carbon black, it is very difficult to distinguish it from other cables when viewed from a distance from the IW or in dim light, making it impossible to hide it.

If the above-mentioned convex strips 4 of the cable and lever are mixed with a coloring pigment other than the cable sheath 2, then for example, if the plastic sheath 2 and the convex strips 4 are to be manufactured using an extrusion method. For example, it is necessary to prepare a special die and perform multi-color extrusion, which inevitably leads to relatively high costs. During cable installation 23-, there is a high possibility that the colored plastic tape will peel off due to various influences such as @ impact, friction, moisture, sunlight, etc., and the identification function will be impaired, so the identification life is very long. I can't say it's a thing.

The present invention has been made in view of the above-mentioned circumstances, and as shown in FIG. This is a cable in which plastic 5 is buried.

In such cables, the markings do not protrude outward as shown in Figure 2, but are buried in the jacket, so @
Even if it encounters damage or abrasion, the length of this portion will not be severely affected, and it will be less affected by the external atmosphere, allowing it to maintain its identification ability over a long period of time.

Further, the method for producing the couple of the present invention will be discussed as follows.

When manufacturing the cable of the present invention, it is of course possible to manufacture it by co-extrusion, since a part of the usual cable sheath is provided with plastic for identification. However, in such cases, for example, a parent-child extruder is used, and the die of the extrusion head has a special structure, which makes the equipment complicated and costs high, so a simple method using a regular extruder is desired. By the way.

The present invention provides a method for manufacturing a marker cable that meets this need.

In this method, a conventional plastic jacket is extruded by dx, and a plastic tape for marking is embedded in the plastic jacket, and the present invention will be explained below with reference to FIG.

In the figure, the cable core 1 is discharged from a delivery roll 11 and enters an extruder 12 where the plastic jacket 2 enters a first water tank 13 at an extrusion depth f'L. Upon exiting this stage, the extruded coating has not yet been completely cooled and remains in a heated state, but its shape has stabilized due to cooling.

From another reel 17 in this state.

A colored plastic tape 18 for marking of the same or similar quality to the plastic sheath 2 of the cable is attached to the plastic sheath 2 of the cable.
184 pieces of colored plastic tape for label identification are buried under the pressure of the pressure roll 19 in the plastic outer shell 2, and the heating causes the area near the roll to touch. The colored plastic tape 18 for marking is fused and integrated with the plastic jacket by melting the plastic.

The cable processed in this way enters the second water tank 14, and the cable jacket 2 is also covered with ls identification colored plastic tape 1.
8 is also completely cooled, pulled by a caterpillar traction device 15, and wound onto a winding JIJ-rule 16.

In this way, a marked cable as shown in FIG. 3 can be easily obtained.

In the above, the temperature of the roll need only be a temperature at which the colored plastic tape for markings is fused.

For example, in the case of polyethylene, the temperature may be 180° to 250°C. In addition, if the cable's plastic jacket is made of polyethylene, polyethylene film, ionic copolymer film, etc. are likely to be fused as colored tape for scissor identification (/-I).
l17 I use my arm.

FIG. 5 shows part-B-11 of the method for manufacturing a craftsman cable according to part 1 of the present invention. However, the feed reel, take-up reel, etc. are the same as those shown in FIG. 4, so they are omitted.

Now, in the same figure, the cable core sent out from the feed +++ L +)-le enters the 1μ pusher 12, is coated with the cable jacket 2, and is cooled in the first water tank 13. Upon leaving this stage, the extruded coating has not yet been completely cooled and is still being heated.
Although it is in a crystalline state, its shape is stabilized by cooling.

Then, from another rail J7 to 2, a colored plastic TESO 18 for marking, which is of the same or similar quality as the plastic sheath 2 of this cable, is sent out, and first passes through a bath agent tank 20 to apply a solvent to the tape surface. Let it attach.

This is applied vertically to the first water (the plastic sheath of the cable that has just left ψi) and is pressed by a roll 19. This roll does not need to be a heated roll.

The colored plastic tape for barrier identification 181-1. A colored plastic commemorative tape 18 is pressed onto and embedded within the plastic jacket.
The wettability between the plastic jacket 2 and the plastic jacket 2 is improved due to the solvent attached to the surface of the plastic jacket 2.

It is fully adhered and integrated.

The cable thus prepared is then fed into the second molten metal 14, completely cooled, and wound onto a reel.

In the above case, for example, when the plastic sheath 2 of the cable is made of polyvinyl chloride, this can be easily accomplished by using vinyl-based colored plastic Teso and using methyl ethyl ketone as the brightening agent.

As described above, the method of the present invention makes it possible to provide, in an extremely simple manner, a marking cable that does not peel off due to abrasion or other causes and that performs the identification function for a long period of time.

[Brief explanation of the drawing]

Question 11: Figure 2 is a cross-sectional view of an identification cable manufactured by the conventional method, Figure 3 is a cross-sectional view of an example of the identification cable of the present invention, and Figure 4 is a cross-sectional view of an example of the method of the present invention. An explanatory diagram for clearing the production line, Figure 5 shows other methods of this method.
・Example 1. It is an explanatory view showing +i construction lines. 1...Cable core 2...-Plastic jacket 5...
Plastic tape for office workers 12...Extruder 13...
Joy 1 aquarium 14...Condolence 2 aquarium 18...Colored glass tape for signs 19...Suppression roll agent Patent attorney Mamoru Takeuchi

Claims (1)

[Claims] (1) A marked cable characterized in that a plastic label is embedded in the surface of a plastic jacket provided on the outside of the cable core. (2) A cable with a plastic jacket extruded on the outside of the cable core. A plastic marking tape of the same quality or similar quality to the plastic jacket was attached to the plastic jacket while it was still warmed, and it was embedded in the wood surface using a pressure roll, and at the same time it was integrated with heat or a detergent. A method for manufacturing a marked cable characterized by