JPS62252011A - Cable filled with moisture-proof compound - 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 cable filled with a waterproofing compound, and is particularly suitable for cases where the insulated core wire has a large diameter and the twist structure is a cut twist. It is.

[Prior art]

In the case of cables, especially communication cables, in the unlikely event that the cable sheath is damaged and flooding occurs.

Water runs quickly through the cable twist gap in the cable core, and even if the cable sheath is only locally damaged, the characteristics of the entire cable are inevitably deteriorated. For this reason, it has been known for a long time to fill the gaps between the wires of the cable core with a shell-like waterproofing mixture of petrolatum or polypdenum.

As a method for filling a cable core with a waterproofing mixture, the cable core is passed through a waterproofing mixture filling device, and in this device, a heated and molten sherry-like waterproofing mixture is press-fitted into the gap between the twisted conductors of the running cable core. is common.

[The problem that the invention attempts to solve]

For admixture-filled cables manufactured by the above-mentioned filling method, relatively good admixture filling is possible when the insulated core wire of the cable has a small diameter, but if the insulated core wire has a large diameter In this case, especially when filling the cut stranded wires, there are no gaps between adjacent insulated core wires of the cut stranded wires.

Therefore, a situation occurs in which the middle part of the cut stranded wire is hardly filled with the mixture. Also, even if it is filled,
Due to the size of the voids, if the cable reverts to mud, the shrinkage of the sherry will cause large cracks that will continue in the longitudinal direction, making water running unavoidable if the cable sheath is damaged and flooded.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned problems, and even if the insulated core wire of the cable has a large diameter and the twist structure is cut twist, it is possible to effectively prevent water running. It provides an admixture-filled cable, which has an intervening string with a waterproof admixture attached at the center of the cut strands, and a gap in the center of the cut strands is filled with the intervening string and the waterproof admixture. It is a waterproof admixture filled cable.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a cut stranded wire of a waterproof compound cable according to the present invention, FIG. 2 is a cross-sectional view of an embodiment of the waterproof compound cable according to the present invention, and 1.1' is an insulated core wire. , 2 is an intervening string to which a waterproof mixture is attached, 3 is a cut stranded wire, 4 is a waterproof mixture, 5 is a pressing tape, and 6 is a cable north.

In this embodiment, the cable is placed on the intervening string 2 with the waterproof mixture attached.
Four cut stranded wires 3 made by twisting two insulated core wires 1 are twisted onto the insulated core wire 1', and four insulated core wires 1' are arranged respectively in the twisting recesses of the cut stranded wires. The insulated core wire 1 has a conductor diameter of 1.2 ms and an insulation thickness of 1.2 ms.
5 + gm, the insulated core wire diameter is 3.7 m, the insulated core wire 1' has a conductor diameter of 0.9 m, the insulation thickness is 1.3 m, and the insulated core wire diameter is 3.5 m, and the intervening cord 2 has an outer diameter of 1.4 + w. It is a PE string. The manufacturing process for this cable will be described below. First, the PE string is immersed in a sherry melting tank. Next, this PE string is pulled up from the sherry melting tank as it is or through a die, and the PE string with sherry attached to its surface is used as a center intervening material for cutting and twisting, and four insulated core wires are twisted on top of it for cutting and twisting. . By the above method, the layer of sherry formed around the PE string is deformed along the gap in the center of the cut strand, and as a result, the gap in the center of the cut strand is completely filled by the PE string and sherry. Furthermore, the excess sherry slightly protrudes into the twisting recess of the cut stranded wire. Next, the four cut strands 6
and five insulated core wires 1' are twisted together, and then,
The wire is passed through a sherry filling device, and heated and molten sherry is filled into the core wire twisting gap.

The outer diameter of the above PE string can be selected as appropriate depending on the size of the gap at the center of the cut strands, and the amount of sherry attached to the PE string can also be determined by the pulling speed of the PE string, die dimensions, and the shell temperature. Alternatively, by changing the number of times the PE string is immersed in the sherry dissolving tank, etc., it is possible to adjust the adhesion amount to a predetermined amount that matches the size of the gap and allows the sherry to slightly protrude into the twisting recess of the cut stranded wire.

In the above embodiment, a case was explained in which PE string was used as the intervening string, but it is not limited to this, and jute,
Of course, various interpositions such as polypropylene braid, PVC string, etc. can be used.

FIG. 2 shows a cross-sectional view of another embodiment of the waterproof mixture cable according to the present invention, in which 1 is an insulated core wire 1, 2, 2' is a waterproof mixture adhering intervening string, 3 is a cut stranded wire, and 4 is a stranded wire. 5 indicates a waterproof mixture, and 5 indicates a presser tape 6 indicates a cable sheath. This example shows an example in which the waterproof admixture-adhering intervening string is inserted not only at the center of the cut stranded wire but also at a location with a large gap.

In addition, not only the intervening string but also the presser tape, loosely wound tape, etc. are soaked in a sherry dissolving tank in advance to adhere sherry, and the intervening string, presser tape, etc. to which these waterproofing mixtures are attached absorb moisture and swell. If the adhesive powder is attached to the cable, it becomes a waterproof mixture-filled cable that is even more effective in preventing water running.

Furthermore, the waterproof mixture adhering intervening string of the present invention can be used not only for cables made of cut stranded wires, but also for cables made of single wires or twisted pair wires, if inserted into a large gap. Effective in preventing water.

〔effect〕

The waterproof mixture-filled cable of the present invention has a comb to prevent the waterproof mixture from entering, and an intervening string with the mixture attached to the center of the cut strands, so that the mixture does not deform along the void. This completely fills the voids, resulting in a waterproof mixture-filled cable that has a good water running prevention effect. It can also be applied to areas other than the center of the cut stranded wire, and is very effective when the insulated core wire is thick. Furthermore, since the intervening string with the waterproofing mixture attached is inserted into the center of the cut strands during cutting and twisting, extra labor such as winding it up on a drum and transporting it is eliminated, and it also prevents contamination of the manufacturing equipment and its surroundings. It's also effective.

The present invention has been able to solve the problem of preventing water running, even for cables filled with waterproof admixtures with large core wires of 0.9 molarity or more, which has been considered difficult until now, and is of great value from an industrial perspective. There is something big.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of cut stranded wires of a waterproof mixture-filled cable according to the present invention, FIG. 2 is a cross-sectional view of one embodiment of the waterproof mixture-filled cable according to the present invention, and FIG. 3 is another embodiment. FIG.

Claims (1)

[Claims] 1. In a cable filled with a waterproof mixture in which the gap between the insulated wire cores is filled with a waterproof mixture, an intervening string made of a waterproof mixture is attached to the center of the cut stranded wire, and A waterproof admixture-filled cable characterized in that the voids are filled with an intervening string and a waterproof admixture.