JPH052924A - Cable and its manufacture - Google Patents

Abstract

PURPOSE:To provide a cable which is easy to manufacture and with which the effect of covering the cable core is enhanced. CONSTITUTION:Cord groups consisting of cord elements 12 made of resin are installed mutually intersecting around a cable core 11 in a plurality of layers, and the intersections are joined by fusion so as to accomplish a mesh-form covering 13, and thereby a protection layer for the cable core 11 is provided to damp external forces. Eventual severance of the cable during its service will restrict its influence upon the limited area, and no affection be disseminated to other parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable and a method for manufacturing the cable, and particularly to improve the coating and heat insulation of the cable core, and the pressure buffering.

[0002]

2. Description of the Related Art Conventionally, in order to cover and protect a cable core, there is an intermittent protective coating having a void portion through which inner and outer layers penetrate. An example of this conventional intermittent protection is shown in FIG. As shown in the figure, a protective layer 103 made of a protective material 102 such as tape is provided on the outer peripheral surface of the cable core 101 by gap winding. As a method of winding the protective layer 103,
Protective material 102 previously processed into a linear or tape shape
Is wound around a plurality of layers using a winding machine or the like.

As another winding method, there is a method of winding a plurality of layers in the same layer by a special winding method (braid etc.) so that they are intertwined with each other and are not separated from each other.

[0004]

However, the above-described conventional cable protection method has a problem in that the protective material 102 in the shape of a wire, a tape, or the like must be manufactured and prepared in advance.

Further, since it is necessary to rotate the protective material 102 such as a wire or tape around the cable core using a tape winding machine, the manufacturing speed becomes considerably low and the preparation thereof is troublesome. is there.

Further, in the case of a non-braided structure, the wire and the tape assembly are not connected to each other, and it is difficult to bond them, and by any chance, one of the wire and the tape material may be damaged during use. There is a problem that if it is received and cut off, it will come off from the winding. These drawbacks are that the winding protection member is produced to some extent regardless of whether it is metal or plastic.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a cable which is easy to manufacture and has a high covering effect, and a manufacturing method thereof.

[0008]

The structure of a cable according to the present invention that achieves the above-mentioned object is provided with a mesh-like coating portion formed by fusion-coating a plurality of resin-based cord groups on the outer periphery of a cable filament body. It is characterized by having.

Further, in the method for manufacturing a cable according to one of the present invention, a plurality of resin-based cord groups are helically extruded on the outer periphery of the cable filament, while the other one is extruded in the direction opposite to the extruding direction. The resin-based cord group is extruded in a spiral shape, and the extruded cord-like bodies are then fused at the intersections of the extruded cord groups to form a net-like covering portion.

[0010]

[Function] Thermoplastic resin is extruded from a rotary extrusion crosshead coaxial with the cable filament body to extrude a resin-based cord group consisting of a plurality of cord-shaped bodies, and while rotating around the cable filament body, the outer circumference of the cable filament body. And the resin-based cord group is wound in a layered manner on the outer periphery thereof while rotating the resin-based cord group in the opposite direction of the cord-shaped body wound coaxially with the filament body. These extruded cords of the thermoplastic resin in a semi-molten state are fused and integrated at the intersections, respectively, to form a net-like covering portion on the outer periphery of the cable linear body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a cable according to this embodiment,
FIG. 2 is a schematic view showing a state in which a mesh-shaped covering portion is formed, FIG.
Is a cable manufacturing process diagram, and FIG. 4 is a schematic structure diagram of an extrusion crosshead for extruding a cord-shaped body.

As shown in FIG. 1, in a cable 10 according to this embodiment, a plurality of cord-like bodies 12 which are opposite to each other are fused together at respective intersections on the outer periphery of a cable core 11 which is a cable linear body, and are substantially integrated. Has a mesh-like covering portion 13.

Here, the cord 12 is extruded from a plurality of nozzle holes 22 provided in the extruding crosshead 21 shown in FIG. 2, for example, and its material is a known thermoplastic resin.

Next, a method of extruding the cord-shaped body 12 will be described with reference to FIG. As shown in FIG. 2, the extrusion crosshead 21 for manufacturing the cable according to the present embodiment includes a rotatable first nozzle block 23A having nozzle holes 22 for extruding a plurality of linear bodies 12 on the same circumference. The first nozzle block 23A has a second nozzle block 23B which is coaxial with the first nozzle block 23A and is rotatably provided on the outer periphery of the first nozzle block 23A and similarly has a nozzle hole 22 through which a plurality of linear bodies 12 are extruded.

Therefore, first, the first and nozzle blocks 23
A plurality of cord-like bodies 12 are spirally wound, for example, in a clockwise direction from each nozzle hole 22 of A on the outer periphery of the cable core 11 to form an inner layer made of a resin-based cord group, and a cord from the first nozzle block 23A is also formed. A plurality of string-shaped bodies 12 are provided on the body 12 in a counterclockwise direction from the nozzle 22 of the second nozzle block 23B.
Is spirally wound to form an outer layer made of a resin-based string group, and the extruded melted inner and outer layer string-like bodies 12 are in contact with each other while intersecting at an angle, and the intersections are fused to form the inner and outer layers. The cord groups are integrally formed into a net-like shape, and the net-like covering portion 13 is formed on the cable core 11 to serve as a protective layer.

The net-like net-like covering portion 13 thus formed suppresses the inner cable core 11 from the outer circumference to prevent its shape from being collapsed, and serves as a protective layer containing a large amount of voids penetrating the inner and outer layers. .

Therefore, the obtained cable 10 having the mesh-like covering portion 13 is provided with a protective material such as a tape made of plastic in advance, which is wound in a plurality of layers or a plurality of layers by a winding machine, as is conventionally done. Compared with the complicated and labor-intensive method of attaching, it is possible to process in one manufacturing process, and the wound string-like body is fused and fixed at the intersections of the adjacent layers to form a mesh-like result. Even if one of them breaks during use, the influence is accumulated only in that portion, and there is no possibility that it will spread in the length direction and the circumferential direction of the cable.

Further, since the mesh-like covering portion 13 has a large amount of suitable thicknesses and voids of the cord-like bodies, it serves as a buffer protective layer against external force from the outer periphery, and since it contains a large amount of air, it is thermally insulated. Is also effective.

Furthermore, if a material having a good heat insulating property or a foamed thermoplastic resin is used as the resin forming the string-like body 12, the above-mentioned cushioning and heat insulating effects are improved.

On the other hand, when a resin having high strength such as polyamide resin is used as the other material of the linear member, the strength such as abrasion resistance and tensile strength is increased and the reinforcing role is also improved.

As a special application, in the case of a cable or the like that expects water to enter the cable for heat dissipation, transmission characteristics, and stabilization of water pressure resistance of the underwater cable, the water can easily enter. It has the strength against the required external force and also plays the role of preventing the internal cable core from loosening.

Next, a cable is formed by using a thermoplastic coating extruder having a coaxial two-layer structure and nozzles rotating in mutually opposite directions for extruding the cord-like body 12 forming the mesh coating layer 13. An example of a manufacturing process for manufacturing will be described.

FIG. 3 shows a coating extruder for manufacturing, in which the cable core 11 is fed from the supply stand 31 and passes through the extrusion crosshead 21 and, as will be described in detail later, a plurality of cords in two layers or a plurality of layers. A semi-molten thermoplastic resin string 12 extruded while rotating in a circular shape is wound around the outer periphery of the cable core 11 and extruded, and is fused at the intersections of the inner and outer layers to form a mesh-like covering portion 13.

Next, a cooling tank 32 for water or air gas
By passing through, the mesh coating 13 is cooled and solidified,
A coating protective layer is formed.

The cable 10 thus formed with the mesh-like covering portion 13 is pulled by the pull-out capstan 33 and wound on the winding drum 34 or the like to be completed.

Here, the cord-like body 1 which is wound around the cord and extrusion-coated is used.
The thermoplastic resin 35 used for 2 is a normal wire extruder 36.
Although it is supplied in a granular form from the supply port 37, it is heated in the heating cylinder 38 of the extruder 36, kneaded by the screw 40 rotated by the motor 39, and pushed into the crosshead 21.

Next, an outline of the structure inside the extrusion cross head 21 is shown in FIG. As shown in the figure, the thermoplastic resin 35 is heated and kneaded and softened by the screw 40 in the heating cylinder 38, passes through the breaker plate 41, and enters the resin pool 42 in the crosshead 21. The resin pool 42 is the outer layer block 43.
And the inner layer block 44, and both blocks 4
3, 44 are fitted so that they can rotate in different directions. A plurality of throats 45 and 46 are provided on the side surfaces of the blocks 43 and 44, respectively, and the resin 35 that is melted and softened passes through the throats 45 and 46 and is formed into a string shape from the plurality of nozzle holes 22 formed. It becomes the body 12 and is extruded onto the cable core 11 passing through it (see FIG. 2).

Therefore, the first rotation block 43 having a plurality of nozzle holes 22 and the plurality of nozzle holes 22 located inside
Since the second rotation block 44 having a plurality of cords pushes out a cord group composed of a plurality of cord-shaped bodies 12 while rotating in opposite directions to each other, these cord groups (inner layer and outer layer) are crossed with each other. Coated on top.

At this stage, since the extruded thermoplastic resin string group is still at a high temperature and its surface is in a softened and melted state, it cross-contacts with each other to melt and adhere to each other to form a net-like structure, and after cooling, it solidifies to form a cable core 11 A mesh-like covering portion 13 is formed on the top.

The crosshead 21 includes an outer block 43 and
The inner block 44 and the inner block 44 rotate coaxially with each other, and
Of the high temperature molten thermoplastic resin 35 from the rotating surface of the
The rotating bearing 47 and the leakage prevention seal 48
And the other end (crosshead of the cable core)
These blocks are rotated on the entrance side)
The rotary pulleys 49 and 50 are attached. In addition, rotation
Is the motor M shown in FIG. ₁, M₂Via belt etc.
It is driven, but details are omitted.

[0032]

As described above in detail with reference to the embodiments, according to the present invention, the cable core is integrally formed with the mesh-like covering portion, so that the inner cable core is intermittently covered and protected and the resin is selected. This can improve the heat insulation or pressure buffering effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a cable according to an embodiment.

FIG. 2 is a schematic view showing a state in which a mesh-shaped covering portion of the cable according to the present embodiment is formed.

FIG. 3 is a process drawing of a cable according to the present embodiment.

FIG. 4 is a schematic structural view of an extrusion crosshead.

FIG. 5 is a perspective view of a cable according to the related art.

[Explanation of symbols]

10 cables 11 cable core 12 string 13 Meshed coating 21 Extrusion crosshead 22 nozzle holes 23A No. 1 nozzle block 23B No. 2 nozzle block 31 Supply Stand 32 cooling tank 33 drawer capstan 34 winding drum 35 Thermoplastic resin 36 Wire Extruder 37 Supply port 38 heating cylinder 39 motor 40 screws 41 breaker plate 42 resin pool 43 Outer layer block 44 Inner layer block 45,46 throat 47 Rotation bearing 48 Leakage prevention seal 49,50 rotating pulley

Claims (2)

[Claims] 1. A cable having a mesh-like coating portion formed by fusion-coating a plurality of resin-based cord groups on the outer periphery of a cable filament body. 2. A plurality of resin-based cord groups are spirally extruded on the outer periphery of the cable filament, and another one of the resin-based cord groups is spirally extruded in a direction opposite to the extruding direction, and thereafter. A method for manufacturing a cable, characterized in that the extruded cord-like bodies are fused at an intersection of the extruded cord groups to form a net-like covering portion.