JPS61193306A - Jointing of metal composite tape for cable - 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 [Field of Industrial Application] The present invention relates to a method for jointing metal composite tapes for cables.

[Prior Art] Generally, the structure of the water-shielding layer used in an under-sheath water-shielding cable, which is formed by fusing a corrosion-proofing layer and a water-shielding layer, has a thickness of 20 to 80 mm.
An insulating plastic film layer is pasted on one side of a metal foil such as aluminum foil, copper foil, or lead foil with a thickness of about μm, and a conductive plastic film layer with a volume resistivity of 10"Ω-cm or less is pasted on the other side. The so-called metal composite tape that constitutes such a water-blocking layer becomes necessary to connect the metal composite tapes with each other as the length of the cable line becomes longer. The metal composite tape joint method is as shown in FIG.
The conductive plastic film layer 4 of the other metal composite tape 3 was laminated on the insulating plastic film layer 2 of the metal composite tape 3 so as to be in contact with each other, and the two were integrated by heat fusion.

In the case where the metal composite tape 1.3 is connected in this way, the insulating plastic film layer 2 is interposed on the metal foil 5, so the connecting portion is not electrically connected. Furthermore, in order to enhance the launching effect, it is necessary to increase the overlap between the two.

[Problems to be Solved by the Invention] The conventional metal composite tape joint method described above has the following drawbacks. In other words, when a surge or induced voltage enters the cable, if the metal foils 5.6 between the water shields are not electrically connected along the length of the cable, the potential will increase between the metal foils 5.6 at the connection point. may occur, causing electric discharge and melting the metal foil 5.6. In addition, if the overlapping margin of the metal composite tape 1.3 is increased in order to improve water-blocking properties, stress will be concentrated at the overlapping part, and if the cable core expands and contracts repeatedly due to the cable heat cycle, the overlap will occur. Metal foil 5.6 at the mating part
causes fatigue rupture.

The present invention has been made in view of the above points, and it is possible to reliably electrically connect metal composite tapes to each other at the connection part, to alleviate stress concentration at the connection part, and to quickly and easily connect metal composite tapes. We have discovered an Indian method for producing metal composite tape for cables that can connect tapes together.

"Means for Solving the Problems" The present invention provides a metal composite tape for cables having an insulating film layer on one side of a metal foil and a conductive film layer on the other side. Peeling off the metal foil, place the other metal composite tape for a cable between a predetermined portion of the insulating film layer and the metal foil exposed by peeling so that its conductive film layer is in contact with the metal foil of the composite tape. A method for jointing a metal composite tape for cables, comprising: inserting the insulating film layer, one end of the other metal composite tape for cables, and the metal foil together by thermocompression bonding.゛.

When inserting one end of the other cable metal composite tape, a solder layer is interposed between a predetermined portion of the insulating film layer and the metal foil exposed by peeling, so that the metal foils are electrically connected to each other. It is desirable that the connection be made physically and mechanically.

In this case, the solder to be inserted is preferably cream solder. □It is preferable to use cream solder in terms of work, and it is more preferable to use non-oxidized solder in terms of quality. The use of non-oxidized cream solder eliminates defects such as pinholes and voids in the solder area, allowing for stable and highly reliable connections.

As the thermocompression bonding means, it is preferable to use a heat sealer or an iron, and when solder is inserted into the connection part, it is necessary to perform thermocompression bonding at a temperature higher than the melting point of the solder.

[Function] According to the method of staining metal composite tape for cables of the present invention, the insulating film layer of the metal composite tape is peeled off, and one end of the other metal composite tape is thereby separated between the exposed metal foil and the insulating film layer. Since the two metal foils are inserted and heat-sealed together, the two metal foils are electrically connected via one of the conductive film layers. Furthermore, when a solder layer is interposed between the two, the metal foils are also directly electrically connected to each other. Therefore, the metal composite tapes can be easily and reliably electrically connected to each other at the connecting portion.

Moreover, since the inserted metal composite tape is completely covered by the other insulating film layer, the water-blocking property can be sufficiently increased.

Therefore, concentration of stress at the connection portion can be alleviated.

[Effects of the Invention] According to the method for jointing metal composite tapes for cables according to the present invention, the metal composite tapes are reliably electrically connected to each other at the connection portions, and stress concentration at the connection portions is alleviated. Furthermore, metal composite tapes can be connected quickly and easily.

[Examples] Examples of the present invention will be described below with reference to the drawings.

Example 1 First, as shown in FIG. 1 (A), the insulating film layer 16 of one cable metal composite tape 10 is peeled off from the metal foil 12 over a length of 30 #. Then, as shown in FIG. As shown in FIG. 2, the conductive film layer 15 of the cable metal composite tape 11 to be connected is inserted so as to be in contact with the metal foil 12 exposed by peeling off the insulating film 116.

Next, the peeled insulating film layer 16 was placed on the insulating film layer 17 of the inserted cable metal composite tape 11 (FIG. C), and they were thermocompressed together using a heat sealer to connect the water-shielding tapes. .

Example 2 First, as shown in FIG. 2(A), the insulating film layer 16 of one of the cable metal composite tapes 10 is peeled off from the metal foil 12 over a length of 30 mm in the same manner as in Example 1. Next, as shown in the same figure (B), the peeled insulating film layer 1
Pb-8n- with a melting point of 145°C is placed between 6 and metal foil 12.
A solder layer 18 is formed by inserting Cd-based non-oxidizing cream solder. Next, as shown in FIG. 2C, the conductive film layer 15 of the other cable metal composite tape 11 to be connected to the exposed metal foil 12 is inserted so as to be in contact with the exposed metal foil 12. Next, the insulating film layer 17 of the inserted cable metal composite tape 11 was covered with the peeled insulating film layer 16, and they were thermocompression bonded together using an iron heated to 180° C. to interconnect the tapes.

Comparative Example The ends of two metal composite tapes 1.3 for cables having the same structure as that of Example 1.2 are shown in FIG.
The water-shielding tapes were interconnected by thermocompression bonding with an iron using a mating margin of 30#.

The water-shielding tape containing the joints of Example 1.2 and Comparative Example obtained in this way was wrapped vertically on the outside of the cable core, and the wrap portion was thermocompressed, and then PVC was applied on the water-shielding tape layer. Extrusion coating with anti-corrosion layer, 660KV, 500S
A Q-waterproof CV cable was manufactured.

In addition, metal composite tape 10 for cables that serves as a water-shielding tape
．． 11 is a metal foil 12.1 made of lead foil with a thickness of 50 μm.
A conductive film layer 14.15 made of a heat-sealable conductive film (modified EEA) with a thickness of 100 μm is attached to one side of the metal foil 12.13, and an insulating film layer 16.1 is attached to the other side of the metal foil 12.13.
7 was attached. Insulating film layer 16.1
In No. 7, a gold layer was formed adjacent to the PVC on each PET layer having a thickness of 50 μm. Moreover, the conductive film layer 14.
The volume resistivity of No. 15 is 10 3 Ω.

Each of the water-shielding CV cables thus obtained was subjected to a continuity test of the conductive film layer, a reciprocating vent test, and a water-shielding test, and the results shown below were obtained.

(1) Continuity test of conductive film layer When the conductivity of the conductive film layer of each water-permeable CV cable was examined, the resistance value was 0Ω for the one using the water-shielding tape of Example 2. It was found that the resistance value was 102Ω in the case where the water-blocking tape of Example 1 was used. On the other hand, the one using the water spray tape according to the comparative example had a resistance of infinite Ω, and the metal composite tape for cables had a resistance of 1.3
It was found that they were not electrically connected to each other.

(2) Reciprocating bend test Each water-shielded CV cable was subjected to five reciprocating bend tests at a diameter 10 times the outer diameter of the shield, and then the cables were disassembled. As a result, in the cable using the launching tape of Example 1.2,
The connections were good in both cases, but the comparison example
Breaks were observed at the connections in the cables using the cables.

(3) Water-shielding performance test The water-shielding CV cables of Example 1.2 and Comparative Example were immersed in warm water at 60°C for one month, and then taken out.
The moisture content of the outer conductive layer of the cable core was measured. In the cable using the waterproof tape of Example 1.2, no change in moisture content was observed compared to before immersion, but in the cable using the launching tape of the comparative example, the outer conductive layer of the cable core It was found that the water content clearly increased.

[Brief explanation of drawings]

Figures 1 (A> to (C)) and Figures 2 (A) to (D) are explanatory diagrams showing the method of the present invention in the order of steps, and Figure 3 is a cable manufactured by the conventional method. 10.11... Metal composite tape for cables, 12.1
3... Metal foil, 14.15... Conductive film layer,
16.17... Insulating film layer, 18... Solder layer.

Claims (3)

[Claims] (1) A predetermined portion of the insulating film layer of a metal composite tape for cables having an insulating film layer on one side of the metal foil and a conductive film layer on the other side is peeled from the metal foil, and the insulating film layer The other metal composite tape for cable is inserted between a predetermined portion of the cable and the metal foil exposed by peeling so that its conductive film layer is in contact with the metal foil of the composite tape, and then the insulating film layer is A method for joining a metal composite tape for a cable, characterized in that a predetermined portion of the metal composite tape for a cable, one end of the other metal composite tape for a cable, and the metal foil are integrally bonded by thermocompression. (2) Claim 1, characterized in that a solder layer is interposed between the peeled insulating film layer of the metal composite tape for cables and the metal foil exposed by peeling.
Method for joining metal composite tape for cables as described in Section 2. (3) The method for joining a metal composite tape for cables according to claim 1 or 2, wherein the conductive film layer of the metal composite tape for cables has a volume resistivity of 10^6 Ω-cm or less.