KR101687795B1

KR101687795B1 - High strength cable for ship

Info

Publication number: KR101687795B1
Application number: KR1020100023243A
Authority: KR
Inventors: 김연정; 김태성; 권양미
Original assignee: 엘에스전선 주식회사
Priority date: 2010-03-16
Filing date: 2010-03-16
Publication date: 2016-12-21
Also published as: KR20110104228A

Abstract

The present invention relates to a high strength cable for marine vessels which improves the internal structure and material of cables to improve the efficiency of laying work while maintaining strength and impact resistance.
According to the present invention, there is provided a conductor line assembly comprising: a conductor line assembly including a center conductor and an insulator covering the center conductor; A binding tape surrounding the conductor bundle portion; An inner sheath provided to surround the binding tape and made of a polymer compound; An outer sheath made of a polymer compound provided at the outermost portion of the cable to protect the cable; And a reinforcing tape composed of a double layer of a polyester film and a foamed polyester film interposed between the inner sheath and the outer sheath to wrap the inner sheath.

Description

{High strength cable for ship}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship cable, and more particularly, to a high strength cable for a ship which improves the internal structure and material of a cable to improve the efficiency of laying work while maintaining strength and impact resistance.

Ship cables used to supply power and control signals from ships should have flame retardancy and impact resistance in order to minimize the damage caused by ship-related disasters such as fires that may occur during navigation.

As shown in Fig. 1, a conventional marine cable includes a conductor line made of a center conductor 10 and an insulator 11, a filler 12 filled in the outside of the conductor line, and a binding A binding tape 13, an inner sheath (or bedding) 14 provided outside the binding tape 13 for cable protection, a metal braided layer 15 and an outer sheath 16 Structure. Patent related to marine cables having such a structure includes Korea Patent No. 384130 (Koyan Yan low emission cable and its cis composition) filed by the present applicant and patented.

In the conventional marine cable, the metal braided layer 15 is provided in a braided structure by metal such as copper, aluminum, iron, or the like, and is provided between the inner sheath 14 and the outer sheath 16 so as to surround the inner sheath 14 To protect the cable from external impact.

However, since the marine cable provided with the metal braided layer 15 requires a special tool to cut or cut the metal braided layer 15 when the cable is cut, the inner sheath 14, the outer sheath 16, and the like, There is a problem in that when the outer diameter of the metal braid layer 15 is small, the core conductor 10 is deformed by an external impact, thereby causing power loss . In addition, there is a problem that it is not easy to construct a unit by performing a metal braiding process in a cable coupling process, and it is difficult to handle the cable as described above, so that a cable connecting operation is not easy.

The marine cable provided with the metal braided layer 15 may cause leakage of power between the center conductor 10 and the metal braided layer 15 so that there is a limit in reducing the thickness of the insulator 11 and sheath Therefore, there is a disadvantage that the cable outer diameter design is not free.

In order to solve such a problem, a non-metallic high-strength separator tape is wound around the inner sheath 14 and the outer sheath 16 in place of the metal braid layer 15 in recent years, and used as a reinforcing layer of the cable for marine cables. This has the advantage that flexibility of the cable can be increased while maintaining the impact strength similar to the case of using the conventional metal braid layer 15. [

However, the high strength separator tape used for the above-mentioned improved marine cable has a low surface roughness due to its characteristics. Therefore, when the high-strength separator tape is interposed between the inner sheath and the outer sheath of the ship cable, the frictional force between the two layers is reduced, thereby causing a slip phenomenon between the inner sheath and the outer sheath during cable installation and cable handling So that the working efficiency is lowered and handling of the cable becomes difficult.

Accordingly, it is an object of the present invention to provide a high-strength cable for a ship, which is improved in structure and material of a ship cable composed of a high-strength separator tape and is easy to install and handle while maintaining impact resistance and strength, The purpose is to provide.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

According to an aspect of the present invention, there is provided a high strength cable for a ship, comprising: a conductor wire bundle including a center conductor and an insulator covering the center conductor; A binding tape surrounding the conductor bundle portion; An inner sheath provided to surround the binding tape and made of a polymer compound; An outer sheath made of a polymer compound provided at the outermost portion of the cable to protect the cable; And a reinforcing tape composed of a double layer of a polyester film and a foamed polyester film interposed between the inner sheath and the outer sheath to wrap the inner sheath.

Further, the foamed polyester film of the reinforcing tape is preferably a felt type tape or a nonwoven fabric.

The thickness of the reinforcing tape is 0.315 mm or less, the thickness of the polyester film is 0.075 mm or less, and the thickness of the foamed polyester film is preferably 0.24 mm or less.

Preferably, the polyester film and the foamed polyester film of the reinforcing tape are composed of a polyester or a polyester mixture.

In addition, the inner sheath and the outer sheath are preferably made of a mixture of polyvinyl chloride (PVC) or polyvinyl chloride (PVC).

According to the present invention, the reinforcing layer interposed between the inner sheath and the outer sheath of the ship cable is constituted by a reinforcing tape composed of a polyester film and a foamed polyester film, thereby increasing the frictional force between the inner sheath and the outer sheath It is possible to prevent a phenomenon in which the cables are separated from each other during installation.

Therefore, it is possible to perform the cable laying and handling work more easily while maintaining the strength and the impact resistance characteristic of the existing cable.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further augment the technical spirit of the invention. And should not be construed as limiting.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view showing a configuration of a marine cable according to the prior art; FIG.
2 is a cross-sectional view illustrating a configuration of a high strength cable for a ship according to an embodiment of the present invention.
3 is a graph showing the surface roughness of a polyester film and a foamed polyester film included in a reinforcing tape of a high strength cable for a ship according to an embodiment of the present invention.
FIG. 4 is a graph showing plastic deformation ratios of respective strata after impact analysis of a high-strength cable for a ship according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

2 is a cross-sectional view illustrating a configuration of a high strength cable for a ship according to an embodiment of the present invention.

2, a high strength cable for a ship according to the present invention includes a conductor wire bundle, a filler 120, a binding tape 130, an inner sheath 140, The outer sheath 150, and the outer sheath 160 are sequentially arranged.

The conductor line collecting part has a central conductor 100 extending along the longitudinal direction of the cable and a predetermined number of conductor wires formed by the insulator 110 covering the center conductor 100.

The center conductor 110 is made of a conductive material such as copper and is a medium for transferring a current or signal in a cable. The center conductor 110 may be a copper wire having a diameter of 8.9 mm.

The insulator 110 is made of a material having insulation and impact resistance and covers and protects the center conductor 110. The insulator 110 may be composed of fluorine rubber, silicone rubber, natural rubber, EPR (ethylene propylene rubber) or HEPR (hybrid-EPR), or a mixture of two or more of them. This provides or improves insulation and impact resistance. In addition, the insulator 110 is preferably formed to have a thickness of about 1 mm.

The filler 120 is provided so as to fill the outside of the conductor line assembly to maintain the cooperating structure of the conductor lines and to provide the buffering function.

The binding tape 130 binds the conductor wires together by winding the conductor wires together. The binding tape 130 is formed to a thickness of 0.043 mm.

The inner sheath 140 is provided to surround the binding tape 130 to absorb the external impact, thereby protecting the inner conductor assembly. The inner sheath 140 is also referred to as a bedding layer. The inner sheath 140 is made of a polymer material or a mixture containing polyvinyl chloride (PVC) or polyvinyl chloride (PVC) having a relatively high impact resistance as a main component. At this time, the inner sheath 140 has a thickness of about 1.2 mm, and it is preferable to use high density / high strength polyvinyl chloride (PVC) as the material of the polyvinyl chloride (PVC).

The outer sheath 160 is provided at the outermost portion of the cable to protect the cable from external impact or corrosion. The outer sheath 160 is preferably made of a mixture mainly composed of polyvinyl chloride (PVC) or polyvinyl chloride (PVC) having a high impact resistance like the inner sheath 140. In addition, the outer sheath 160 has a thickness of about 1.995 mm.

The reinforcing tape 150 is formed of a double layer in which a polyester film 151 and a foamed polyester film 152 are bonded to each other. The inner sheath 140 and the outer sheath 140 (160) so as to reinforce the strength of the sheath. As the material of the reinforcing tape 150, it is preferable to employ a mixture of polyester, polyethylene, or a combination thereof having high workability and impact resistance as well as a high softening point.

In addition, the reinforcing tape 150 having a double-layer structure may be formed of the reinforcing tape 150 interposed between the inner sheath 140 and the outer sheath, due to the characteristics of the foamed polyester film 152 having a high surface roughness Thereby increasing the frictional force. Therefore, the reinforcing tape 150 having such a structure can prevent the separation phenomenon between the inner sheath 140 and the outer sheath 160.

In addition, the polyester film 151 of the reinforcing tape 150 plays a role of improving strength and impact resistance.

Therefore, the reinforcing tape 150 having the double-layer structure of the polyester film 151 and the foamed polyester film 152 as described above can maintain the strength and the impact resistance characteristic of the cable, And to facilitate cable handling.

In addition, the thickness of the polyester film 151 is 0.075 mm or less, the thickness of the foamed polyester film 152 is 0.24 mm or less, the total thickness of the reinforcing tape 150 is 0.315 mm .

Further, it is preferable that the foamed polyester film 152 take the form of a felt type tape or a nonwoven fabric. That is, it is formed so as to take a form that maximizes the roughness of the outer surface.

3 is a graph showing the surface roughness of a polyester film and a foamed polyester film included in a reinforcing tape of a high strength cable for a ship according to an embodiment of the present invention.

As shown in the figure, the surface roughness (Ra) of the foamed polyester film (a) is increased by about 10 times as compared with the polyester film (b).

Further, Table 1 below shows the mechanical performance of a high strength cable for a ship according to an embodiment of the present invention.

Conventional Example Young's Modulus (Mpa) Yield stress (Mpa) Center conductor (D, mm) 8.9 8.9 Insulator (t, mm) 1.0 1.0 42.09 3.71 Inner sheath (t, mm) 1.2 1.2 51.25 14.54 Polyester film (t, mm) 0.15 0.075 2790 53.93 Foamed polyester film (t, mm) - 0.24 794 18.05 Sheath (t, mm) 2.0 2.0 47.72 6.92 Total outer diameter (D, mm) 30.5 30.83

As shown in Table 1, since the tensile strength (Young's Modulus) of the foamed polyester film is about one third of that of the polyester film, two films must be used simultaneously to satisfy the function of replacing the polyester film.

FIG. 4 is a graph showing plastic deformation ratios of respective strata after impact analysis of a high-strength cable for a ship according to an embodiment of the present invention.

Referring to the drawing, when a high-strength cable for a ship according to an embodiment of the present invention having the structure and physical properties as shown in Table 1 is subjected to impact analysis (impact energy 25J), impact strength similar to that of a conventional cable .

Also, in the case of insulation exhibiting the maximum plastic strain, when the foamed polyester film and the polyester film are combined to form a double layer, the strain is reduced by 10%.

As described above, the cable of the present invention, to which a reinforcing tape of a double layer including a foamed polyester film is applied, does not deteriorate in its mechanical properties compared with conventional cables, and the surface roughness of the reinforcing tape is increased, So that it is possible to prevent the deviation phenomenon. Therefore, the embodiment according to the present invention can provide a cable having the same mechanical characteristics as those of the existing cable, and facilitating cable installation and handling.

In addition, the cable installation and handling workability according to the presence or absence of the polyester film and the foamed polyester film included in the reinforcing tape will be compared.

Polyester film Foamed polyester film Installation workability Reason 2 pieces X usually Internal sheath and external sheath separation depending on work environment X 1 piece incongruity Foamed polyester film alone does not meet the impact strength of cable 1 piece 1 piece good Maintains existing cable strength and prevents breakaway

As shown in Table 2, it can be seen that the double-layer structure in which one sheet of polyester film and one sheet of foamed polyester film are combined is most effective for the reinforcing tape.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

100: center conductor 110: insulator
120: Filler 130: Binding tape
140: inner sheath 150: reinforcing tape
160: External sheath

Claims

A conductor wire bundle including a center conductor and an insulator covering the center conductor;
A binding tape surrounding the conductor bundle portion;
An inner sheath provided to surround the binding tape and made of a polymer compound;
An outer sheath made of a polymer compound provided at the outermost portion of the cable to protect the cable; And
And a reinforcing tape composed of a double layer of a polyester film and a foamed polyester film interposed between the inner sheath and the outer sheath to wrap the inner sheath,
Wherein the foamed polyester film of the reinforcing tape is thicker than the polyester film of the reinforcing tape, the total thickness of the reinforcing tape is 0.315 mm or less, the thickness of the polyester film is 0.075 mm or less, The thickness of the ester film is 0.24mm or less.

The method according to claim 1,
In the foamed polyester film of the reinforcing tape,
Characterized in that the tape is a felt type nonwoven fabric.

delete

The method according to claim 1,
Wherein the polyester film and the foamed polyester film of the reinforcing tape are made of a polyester or a polyester mixture.

The method according to claim 1,
Wherein the inner sheath and the outer sheath are made of a mixture of polyvinyl chloride (PVC) or polyvinyl chloride (PVC).