JPS5930005B2 - Plastic cable jacket connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a jacket connection for a plastic cable.
The present invention relates to a method of connecting a cable jacket and a connecting sleeve.

FIG. 1 is a longitudinal sectional view showing a connection structure of a plastic cable jacket obtained by a method according to the prior art.

In order to obtain this connection structure, first, a polyethylene tape 2 is wound around a predetermined position on the plastic cable sheath 1a of the cable 1, and a perforated lead plate 3 is placed on the polyethylene tape 2.

In this state, the perforated lead plate 3 is heated from above and squeezed with a wire to melt the polyethylene into the holes 3a of the perforated lead plate 3.

After that, a glass tape 4 is wrapped around the plastic cable sheath 1a in consideration of the distance from the perforated lead plate 3 according to the length of the auxiliary lead pipe 6, and then the plastic cable is wrapped around the plastic cable sheath 1a. A sealing tape 5 is wrapped around the end of the glass tape 4 through the outer sheath 1a.

In this state, pass the auxiliary lead pipe 6 over the sealing tape 5 so as to cover the sealing tape, first swage the auxiliary lead pipe on the core wire connection part 7 side, and then remove the metal sheath 8 and the perforated lead plate 3 together with the auxiliary lead pipe 6. Perform lead work 9 on the three people.

Thereafter, the auxiliary lead pipe 6 is caulked at three locations along the axial direction of the cable, thereby applying pressure to the internal sealing tape 5 and crimping it.

This fixes the auxiliary lead pipe 6 to the plastic jacket 1a.

Thereafter, the core wire is connected, the main lead pipe 10 is placed over the core wire connection portion 7, both ends are caulked, and finally the main lead pipe 10 and the auxiliary lead pipe 6 are fitted with a lead wire 11.

The airtightness and watertightness of the connection structure obtained by such a conventional connection method are maintained by the adhesive force associated with caulking the auxiliary lead pipe 6 to the sealing tape 5.

The pressurizing force due to such caulking rapidly decreases over time, making it difficult to maintain airtightness over a long period of time.

In addition, the sealing tape 5 wrapped on the cable jacket 1a
Passing the auxiliary lead pipe 6 through and caulking requires skill.
It also had the disadvantage of lack of workability.

The present invention provides a plastic cable sheath connection method that eliminates the above-mentioned drawbacks, and consists of two layers of natural color and black on the cable sheath and sleeve, and an adhesive bonded with temperature-indicating material dotted at the interface. Wrap the tape around the
A natural-colored heat shrink tube is placed over the adhesive tape and heated with a ring-shaped electric heater, etc., making it easy to work by simply monitoring the temperature indicating material. The connection part is made to be highly reliable by being integrated with the heat-shrinkable tube by adhesion.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 5.

FIG. 2 is a diagram showing an example of a plastic cable jacket connection structure obtained by the connection method of the present invention.

In this figure, 1 is a cable, 1a is a plastic cable jacket, 7 is a core wire connection part, 12 is an adhesive tape, and 13 is a plastic cable jacket.
14 is a heat shrink tube, 14 is a connecting sleeve, and 14 is a heat shrink tube.
14b is a metal pipe made of aluminum or the like;

FIG. 3 is a detailed view of the adhesive tape 12, 12a.
12b is an adhesive made of a blend of acid graft modified ethylene ethyl acrylate and ethylene ethyl acrylate, 12b is an adhesive made black by adding 0.1 to 0.5% carbon black to 12a, and 12c is 120' C~
It is a temperature indicating material using polyolefin powder such as high-density polyethylene or polypropylene that melts and becomes transparent at 160°C.

To connect the cable sheath, the connection sleeve 14 is installed at a predetermined position on the cable 1, and the surface of the cable sheath 1a and the surface of the connection sleeve 14 are subjected to physical treatment (visual treatment) to improve melt adhesion. After polishing with a fine sand cloth, etc.) and chemical treatment (wiping with a solvent, etc.),
Wrap the adhesive tape 12 so that the black adhesive 12b is on the cable surface side so that the end of the connection sleeve 14 is on the cable jacket 1a, and the end is also on the connection sleeve 14. It is wrapped so as to cover the adhesive tape 12 wound on the cable jacket 1a, covered with a natural-colored heat shrink tube 13, and heated from one end of the heat shrink tube 13 with a heater such as a ring-shaped electric heater. , Check that the heat-shrinkable tube 13 has shrunk and the temperature indicating materials 12c dotted in the adhesive tape 12 change from white to transparent by looking through the heat-shrinkable tube 13 that has been made transparent by heating, and then remove the other end. It heats up towards.

Once the heat shrinkage of the heat shrink tube 13 has been completed and it has cooled down, a protective black PVC tape or the like is wrapped around it to complete the connection.

In this connection, it is very easy to watch the white powder dotted on the black-backed adhesive tape become transparent, and the operator can connect the heater from one end of the heat shrink tube 13 to the other. While making sure that the temperature indicator disappears, move toward the
No skill is required since it only involves heating.

In addition, the completed connection part is not only watertight and airtight because the jacket 1a of the cable 1 and the polymer substance 14a on the surface of the connection sleeve 14 are integrated with the heat shrink tube 13 via the adhesive tape 12. First, mechanical strength can be sufficiently ensured by controlling the thickness of the heat shrink tube 13.

Fig. 4 shows an example of using an auxiliary lead pipe as a connection sleeve.No. 15 has a ring-shaped protrusion in the center, and the peripheral surfaces on both sides are chemically coated to improve adhesion reliability. An auxiliary ship to which a hot-melt adhesive 15a such as a blend of an acid-grafted modified product of ethylene ethyl acrylate and a blend of ethylene ethyl acrylate is bonded after the auxiliary ship has been subjected to a treatment (for example, tin-plated and then chromate-treated). It's a tube.

To perform the sheath connection, pass the auxiliary lead pipe 15 over the sheath 1a of the cable 1, fix the auxiliary lead pipe 15 at a predetermined position on the sheath 1a of the cable 1, and place the adhesive tape 12 around the area where the adhesive tape 12 is to be wrapped. The outer sheath is physically (polishing with sand cloth) or chemically (wiping with a solvent) treated, and the black surface 12 of the adhesive tape 12 is placed on the outer sheath 1a of the cable 1 after the treatment.
After wrapping it so that b is in contact with the outer surface of cable 1,
An adhesive tape is also wrapped on the adhesive coated surface 15a of the auxiliary lead pipe 15 in the same manner so as to cover the adhesive tape 12 previously wrapped on the outer sheath 1a of the cable 1, and a heat shrink tube is wrapped around the adhesive tape 12. Heating is started from the ring-shaped protrusion of the auxiliary lead pipe 15, and heating is continued to the other end while confirming that the temperature indicating material 12c of the adhesive tape 12 disappears.

When the connections on both sides of the auxiliary lead pipe 15 are completed, connect the core wires, and as in the case of FIG. and terminate the connection.

Because of this connection, as in the case of FIG. 2, very little skill is required.

In addition, in the case of FIG. 1, if there is variation in the outer diameter of the cable 1, the reliability will be affected immediately, but according to this method, the variation in the outer diameter can be easily covered by the shrinkage rate of the heat shrink tube 13. However, the adhesive 15a coated on the auxiliary lead pipe 15 in the factory and the jacket 1a of the cable 1 are integrated with the heat-shrinkable tube 13 via the adhesive tape 12, making it possible to create a highly reliable connection.

FIG. 5 shows an example of the connection between the cable 1 and the cable outlet of the repeater housing or the auxiliary sleeve of the mechanical joint.

16 is a relay case or mechanical joint made of metal such as stainless steel, aluminum, brass, or steel; 16a
15a is an auxiliary sleeve for the cable outlet or mechanical joint of the repeater housing 16, and 15a is an ethylene coated with fusion coating after chemical treatment (chromate treatment, etc.) is applied to the surface of 16a in the factory. It is a blend of ethyl acrylate acid graft modified product and ethylene ethyl acrylate.

To connect this, pass the cable 1 through the cable outlet 16a or the auxiliary sleeve 16a, and
The outer sheath of the cable 1 around which the cable 2 is wrapped is subjected to physical (polishing with sand cloth, etc.) or chemical (wiping with a solvent, etc.)
The adhesive tape 12 is then wrapped with the black side on the surface of the cable 1, and then the adhesive tape 12 is also wrapped over the cable outlet or auxiliary sleeve 16a.

A heat shrink tube 13 is placed over this, and as in the case shown in FIG. 4, heat is applied from the cable outlet or the auxiliary sleeve 16a side to integrate it with the heat shrink tube.

This type of connection ensures high reliability.

As explained above, in the connection method of the present invention, the operator moves the ring-shaped electric heater or the like from one end of the heat-shrinkable tube placed over the adhesive tape to the other end of the heat-shrinkable tube, which becomes transparent at high temperature. No skill is required since the connection can be made by simply heating the adhesive tape through a heat-shrinkable tube and checking that the temperature indicating material dotted in the adhesive tape disappears.

In addition, in the completed connection, the cable surface, the polymer material on the connection sleeve surface, and the heat-shrinkable tube are completely integrated via adhesive tape, so it is not only airtight and watertight, but also has mechanical strength. I can fully guarantee that.

Furthermore, by setting the shrinkage rate of the heat-shrinkable tube to a predetermined width, the outer diameter of the cable and the connection sleeve can be covered over a fairly wide range.

Brief explanation of the drawings ゛Figure 1 is a sectional view of a conventional connection part, Figure 2 is a sectional view of a plastic cable jacket connection structure obtained by the connection method of the present invention, and Figure 3a is a temperature indicator used in the connection method of the present invention. A plan view of the material-containing adhesive tape, Figure 3 is a vertical sectional view of the same, Figures 4 and 5.
The figure is a sectional view of another plastic cable jacket connection structure obtained by the connection method of the present invention.

1...Cable, 1a...Plastic cable jacket, 2...Polyethylene tape,
3... Perforated lead plate, 3a... Hole in perforated lead plate, 4... Adhesive glass tape, 5...
・・Plumb work department, 6・・Auxiliary lead pipes, 7・・・・
Core wire connection part, 8...Steel part of outer sheath, 9...
...Plumb engineering department, 10... Main lead pipe, 11...
... Lead work department, 12 ... Adhesive tape, 12a
...Natural color adhesive, 12b...Adhesive with carbon blank, 12c...Temperature indicating material, 1
3... Heat shrink tube, 14... Connection sleeve, 14a... Polymer substance, 14b...
... Metal pipe, 15 ... Auxiliary lead pipe with a ring-shaped protrusion in the center, 15a ... Adhesive coated in the factory, 16 ... Repeater or mechanical joint, 16a... Cable outlet of repeater, auxiliary sleeve of mechanical joint.

Claims (1)

[Claims] 1. In the connection between a plastic cable sheath and a connecting sleeve whose surface or entire surface is made of a thermoplastic hot-melt adhesive polymer material such as polyethylene, ethylene ethyl acrylate, an acid graft modified product of ethylene ethyl acrylate, or a blend thereof. , a black tape containing carbon black made of a hot-melt adhesive such as a blend of an acid-grafted modified ethylene ethyl acrylate and a blend of ethylene ethyl acrylate wrapped around the sleeve and cable to a predetermined width, respectively, and a natural colored tape are bonded together; A heat-shrinkable tube is placed over the adhesive tape, which is dotted with polyolefin plastic powder such as high-density polyethylene or polypropylene, which melts and becomes transparent at 120°C to 160°C as a temperature indicator, on the interface to sufficiently cover it. By heating the heat shrink tube with a heater such as an electric heater, the heat shrink tube shrinks, and at the same time, the temperature indicating material dotted in the adhesive tape changes from white to transparent through the melted and softened heat shrink tube. A plastic cable sheath connection method characterized by connecting a tube and a sleeve, or a tube and a sheath, by observing that the heating is stopped and the tube and the sheath are cooled.