JP2000294049A - Rubber or plastic power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber or plastic power cable equipped with a shielding/ water shutoff layer unlikely to generate buckling of a laminate tape layer even if bending or ironing is applied to the cable and capable of maintaining the function as a shield layer. SOLUTION: A rubber or plastic power cable is configured so that a laminate tape layer furnished with the functions of a shield layer and water shutoff layer is provided on a cable core and thereon a plastic sheath layer is provided. The laminate tape layer is structure so that one surface of an aluminum tape 1 is subjected to a chromate chemical conversion treatment while an adhesive layer 4 is provided on the other surface so that an aluminum laminate tape 1 is accomplished, which is put on the cable core alongside with the chromate layer positioned inside, and the overlapping part of side edges of the aluminum laminate tape layer is, and also the aluminum laminate tape layer and plastic sheath in between, are adhered together through the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber or plastic power supply comprising a rubber such as EP rubber or cross-linked polyethylene, a plastic insulator, and a laminate tape layer having a function of a shielding layer and a water shielding layer on a cable core. It is about cables.

[0002]

2. Description of the Related Art FIG. 2 shows a rubber in which a laminate tape layer having a function of a shielding layer and a water shielding layer is provided on a cable core.
1 is a cross-sectional view of a plastic power cable. In the drawings, 11 is a conductor, 12 is an inner semiconductive layer, 13 is an insulator such as EP rubber, cross-linked polyethylene, and 14 is an outer semiconductive layer. A laminate tape layer 1 having a function of a shielding layer and a water shielding layer is provided on a cable core 10 constituted by these.
A plastic sheath 16 made of polyvinyl chloride, polyethylene, or the like is extrusion-coated thereon.

FIG. 3 is a sectional view of an example of a conventional copper laminated tape for forming a laminated tape layer. The copper laminate tape is obtained by laminating a plastic film layer 22 such as a polyester film having a thickness of about 75 μm on one side of a soft copper foil 21 having a thickness of 2 μm to 50 μm, and an adhesive layer 23 having a thickness of about 30 μm on the other side. is there. Such a copper laminated tape is vertically attached on the cable core 10 so that the plastic film layer 22 is on the inside, and the overlapping portion of the side edge of the copper laminated tape layer and the space between the copper laminated tape layer and the plastic sheath are: Utilizing heat at the time of extrusion of the plastic sheath 16 applied thereon, it is bonded and integrated through an adhesive layer 23 (Japanese Patent Laid-Open No. 6-3 / 1994).
09948).

[0004]

As described above, a rubber or plastic power cable in which a copper laminated tape is vertically attached on a cable core and adhered to an inner surface of a plastic sheath to serve as a shielding layer and a water shielding layer is used. , The thickness of soft copper foil is 5
If the thickness exceeds 0 μm, the copper laminated tape layer will buckle and break due to bending or ironing when laying the cable, so that the thickness of the soft copper foil must be suppressed to 50 μm or less. However, when the thickness of the soft copper foil is 50 μm or less, there is a problem that the current capacity of the ground fault current is insufficient depending on the use conditions, and the function as a shielding layer cannot be achieved.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and it is difficult for a laminated tape layer to buckle even if a cable is bent or ironed, and the shielding layer can sufficiently function as a shielding layer. It provides rubber and plastic power cables with a water-impervious layer, and is characterized by providing a laminate tape layer that combines the functions of a shield layer and a water-impervious layer on a cable core, and a plastic sheath layer on it. In the rubber or plastic power cable provided, the laminated tape layer is subjected to a chromate conversion treatment on one surface of an aluminum tape, and an aluminum laminated tape provided with an adhesive layer on the other surface, the cable core having the chromate conversion treatment layer inside. Vertically laminated on the top, the overlapping part of the side edge of the aluminum laminated tape layer, and the aluminum laminated tape layer and plastic During the over scan is to being bonded via the adhesive layer.

[0006]

FIG. 1 is a sectional view of an aluminum laminate tape used for a rubber or plastic power cable according to the present invention. In the drawings, reference numeral 1 denotes an aluminum laminated tape forming a shielding layer and a water shielding layer, a chromate conversion treatment layer 3 in which one surface of an aluminum tape 2 is subjected to a chromate conversion treatment, and an adhesive provided on the other surface of the aluminum tape 2. It is constituted by a layer 4. The thickness of the chromate conversion treatment layer 3 is preferably 1 μm or less.

The aluminum laminated tape 1 is vertically attached to a cable core 10 provided with a rubber and plastic insulator 13 as shown in FIG. Between the aluminum laminate tape 1 and the plastic sheath 16 are bonded and integrated via the adhesive layer 4 by utilizing the heat generated when the plastic sheath 16 is extruded thereon, thereby shielding and waterproofing. Tape layer 1 with the function of
5 is constituted.

As described above, the rubber and plastic power cable of the present invention uses the aluminum laminate tape having a more flexible aluminum tape in place of the conventional copper laminate tape to constitute the shielding / waterproof layer. By using such a flexible aluminum laminate tape, it is possible to prevent the laminate tape layer from being buckled and torn or peeled off due to bending or ironing at the time of laying the cable.

However, when aluminum tape is used, there is a problem in corrosion resistance, and there is a concern that corrosion may be caused by water permeation from a cable terminal portion or a connection portion, permeation water of a sheath, or the like.
When the corrosion of the aluminum tape layer progresses, the electric resistance increases and the function as a shielding layer is impaired, which is not preferable.

In order to greatly improve the corrosion resistance of aluminum, it is effective to perform a chromate conversion treatment on the surface of the aluminum tape layer. Chromate conversion treatment is to convert the surface of a metal to a foreign substance with a chromate-base chemical or a chromate-phosphate chemical,
Corrosion resistance is greatly improved.

[0011] By performing the chromate conversion treatment, it is possible to prevent an increase in electrical resistance due to corrosion while maintaining the same flexibility as aluminum tape alone. When the thickness of the chromate conversion treatment exceeds 2 μm, the adhesion to the aluminum tape is reduced, and the coating is easily broken by an external force (bending or friction). As a result of evaluating various film thicknesses, 1
It has been found that by setting the thickness to not more than μm, even when an external force assumed to be applied during cable laying or use is received, the coating is not broken and good corrosion resistance is maintained.

[0012]

EXAMPLE A cable having a structure shown in Table 1 having A-core (Example 1), B-core (Example 2) and C-core (Comparative Example) was prototyped.
To evaluate these cables under the same conditions, FIG.
As shown in Table 2, the evaluation test was carried out by twisting the A-core, B-core, and C-core cables into one three-core stranded cable. The cable of each core is composed of a conductor to an outer semiconductive layer 20, a semiconductive tape 21, an Al laminated tape 2 in order from the center.
2. It is composed of a sheath 23.

[0013]

[Table 1]

[0014]Test items and test methods  (1) Lateral pressure resistance: As shown in FIG. 5, a radius of 80 cm
(Equivalent to 10 times the outer diameter of three-core twisted) wheel or (radius 8
Rollers arranged on a 0cm circumference) with lateral pressure applied
The sample 25 is passed back and forth 10 times to bend and iron the sample.
After conducting a disassembly survey, check the inside of the cable
You. The lateral pressure is 500kg / m (twice the current product allowable lateral pressure).
did. A tension meter 26 is attached to one end of the sample 25. (2) Bending resistance: As shown in FIG.
(10 times the outer diameter of the wire core shield, approximately 1 /
180 ° bend the sample 25 along the cylinder
After two and a half repetitions, a dismantling survey was conducted and the inside of the cable was inspected.
Was examined.

(3) Twist-bending resistance: The test of (2) above is performed with the sample twisted. The twist angle applied to the sample is 90 °. (4) Trauma resistance: As shown in FIG. 7, a load is applied to the sample, and the sample is passed through a cable receiving portion 30 supposing a level difference in the pipeline, and the sample is examined for any damage. The load is 1500 kg (twice the load side pressure of the current product).

The results of the above test are shown in Table 2.

[Table 2]

[0017]

As described above, according to the rubber and plastic power cables of the present invention, by using an aluminum laminate in which the shielding and water-shielding layer has been subjected to a chromate conversion treatment, the bending and bending of the cable during cable laying can be reduced. The squeezing of the shielding and water-impervious layer due to the squeezing and the breakage and peeling are suppressed. Also, by using an aluminum laminated tape subjected to a chromate conversion treatment, an increase in electric resistance due to corrosion of the aluminum tape can be prevented, and a good shielding effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an aluminum laminated tape used for a rubber and plastic power cable of the present invention.

FIG. 2 is a cross-sectional view of a rubber and plastic power cable provided with a laminate tape layer having a shielding / waterproof layer on a cable core.

FIG. 3 is a cross-sectional view of a conventional copper laminated tape forming a laminated tape layer.

FIG. 4 is a structural diagram of a cable used for an evaluation test.

FIG. 5 is an explanatory diagram of a lateral pressure resistance test.

6 (a) and 6 (b) are explanatory diagrams of a bending resistance test.

FIG. 7 (a) is an explanatory view of a trauma resistance test, and (b)
FIG. 2A is a sectional view taken along the line AA of FIG. 2, and FIG. 3C is a sectional view and an end side view of the cable receiving portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum laminated tape 2 Aluminum tape 3 Chromate conversion treatment layer 4 Adhesive layer 10 Cable core 11 Conductor 12 Internal semiconductive layer 13 Rubber and plastic insulator 14 External semiconductive layer 15 Laminating tape layer 16 Plastic sheath

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuru Tokumaru 1-3-1 Shimaya, Konohana-ku, Osaka-shi F-term in Osaka Works, Sumitomo Electric Industries, Ltd. 5G313 FA01 FA09 FB06 FC03 FD14

Claims (1)

[Claims] 1. A rubber or plastic power cable in which a laminated tape layer having both functions of a shielding layer and a water shielding layer is provided on a cable core, and a plastic sheath layer is provided thereon, wherein the laminated tape layer is made of aluminum tape. An aluminum laminate tape that has been subjected to chromate conversion treatment on one side and an adhesive layer on the other side is vertically attached on the cable core with the chromate conversion treatment layer inside,
Rubber, characterized in that the overlapping portion of the side edges of the aluminum laminated tape layer, and between the aluminum laminated layer and the plastic sheath are bonded via the adhesive layer,
Plastic power cable.